CN114108598B - Electroosmosis drainage rigid pile assembly and construction method - Google Patents
Electroosmosis drainage rigid pile assembly and construction method Download PDFInfo
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- CN114108598B CN114108598B CN202111363862.7A CN202111363862A CN114108598B CN 114108598 B CN114108598 B CN 114108598B CN 202111363862 A CN202111363862 A CN 202111363862A CN 114108598 B CN114108598 B CN 114108598B
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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
- 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
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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Abstract
The invention discloses an electroosmosis drainage rigid pile assembly and a construction method. The electroosmosis drainage rigid pile assembly comprises at least two metal piles and at least two drainage pieces, when the electroosmosis drainage rigid pile assembly is used for construction, at least one metal pile is electrically connected with the positive electrode of a power supply, at least one metal pile is electrically connected with the negative electrode of the power supply, a direct current electric field can be formed in soil after the power supply is started, moisture in the soil moves to one side of the metal pile electrically connected with the negative electrode of the power supply under the action of the electric field, and the drainage pieces in the pile cavity drain water, so that the moisture content of the soil is reduced rapidly, the soil is solidified rapidly, and the bearing capacity of a foundation is improved; after the drainage is completed, concrete is poured into the pile cavity, the concrete is combined with the metal pile after solidification to form a high-strength rigid pile, the stability of the metal pile is enhanced and the friction resistance of the pile side is improved by the concrete in the pile, and the pile Zhou Ruantu and the metal concrete pile form a composite foundation, so that the problems of poor pile forming quality and insufficient bearing capacity of the soft soil foundation are solved.
Description
Technical Field
The invention relates to the technical field of soft soil foundation treatment, in particular to an electroosmosis drainage rigid pile assembly and a construction method.
Background
With the economic development of coastal areas and shortage of urban land, a large number of engineering construction projects will be developed in coastal areas. Sludge or silt soft soil is usually buried in coastal strata, and the soil is in a saturated state and has poor engineering characteristics of high water content, low bearing capacity, long consolidation time and the like, and the soft soil foundation needs to be reinforced before engineering construction.
The existing common soft soil foundation treatment methods comprise a drainage consolidation method, an electroosmosis method, a cement soil stirring method and the like, but the soft soil is generally thin in particles and high in hydrophilic mineral content, so that the hydraulic permeability coefficient is low, and the traditional drainage consolidation method is poor in effect and long in consolidation period; although the electroosmosis method can rapidly discharge the water in the soft soil foundation, the later consolidation effect is not ideal, and the final settlement and bearing capacity can not meet the engineering construction requirements. The partial engineering adopts various composite foundation methods to carry out foundation treatment, such as cement soil piles, lime soil piles, cast-in-place pile composite foundations and the like, but the problem of poor pile quality is solved in a large amount in the composite foundation construction in soft soil areas; the precast pile has high bearing capacity and controllable quality, but the pile side soil structure is damaged due to the serious soil squeezing effect generated in the driving process, and the precast pile has overlarge rigidity difference with soft soil, so that the bearing effect of soil between piles cannot be exerted, the use number of pile foundations and the use frequency of machines are increased, and the precast pile is neither economical nor environment-friendly.
In summary, although the existing soft soil foundation treatment methods have various advantages, the existing soft soil foundation treatment methods have the defects of long consolidation period, poor consolidation effect, low bearing capacity, uncontrollable pile forming quality and the like, and cannot meet the construction requirements of modern engineering.
Disclosure of Invention
Based on the problems, the electroosmosis drainage rigid pile assembly and the construction method are necessary to solve the problems of slow drainage consolidation, low bearing capacity and uncontrollable pile forming quality in soft soil areas.
The application provides an electroosmotic drainage rigid pile assembly, comprising:
the pile comprises a pile body, wherein a pile cavity is arranged in the pile body, an opening communicated with the pile cavity is formed in the pile body, a water collecting through hole is formed in the circumferential side wall of the pile body and used for communicating the pile cavity with the outside, at least one metal pile is used for being electrically connected with a positive electrode of a power supply, and at least one metal pile is used for being electrically connected with a negative electrode of the power supply;
at least two drainage pieces, one drainage piece corresponds to one metal pile, the drainage piece detachably inserts and locates in the stake pocket is inside.
When the electroosmosis drainage rigid pile assembly is used, a metal pile is inserted into soft soil, at least one metal pile is electrically connected with a positive electrode of a power supply, and at least one metal pile is electrically connected with a negative electrode of the power supply, so that a direct current electric field is formed between the metal pile electrically connected with the positive electrode of the power supply and the metal pile electrically connected with the negative electrode of the power supply in the soft soil foundation, the metal pile electrically connected with the negative electrode of the power supply becomes a cathode metal pile, the metal pile electrically connected with the positive electrode of the power supply becomes an anode metal pile, and according to an electroosmosis principle, moisture in a soil body moves from one side of the anode metal pile to one side of the cathode metal pile under the action of the electric field, moisture in the soil body can be gathered in a pile cavity of the cathode metal pile, and water in the pile cavity is drained from the pile cavity through a drainage piece in the pile cavity, so that the purposes of quickly reducing the moisture content of the soft soil foundation, quickly solidifying the soil body and improving the bearing capacity of the soft soil foundation are achieved; after the drainage is completed, the drainage piece in the pile cavity is disassembled, filling media such as concrete are poured into the pile cavity, and the metal pile can play a role in isolation and protection for solidification of the filling media such as concrete, so that the filling media such as concrete can achieve a better solidification effect, the solidified concrete and the metal pile are combined to form a high-strength rigid pile, part of the filling media penetrate through the water collecting through holes to enter the soft soil foundation and form a whole with soft soil around the pile after solidification, and therefore side friction resistance of the metal pile and soft soil is improved, and pile forming quality is improved.
In general, electroosmosis promotes the quick drainage and solidification of the piles Zhou Ruantu, the pile body of the metal pipe improves the solidification effect and pile forming quality of concrete in the piles, the metal piles and the concrete are combined to form high-strength rigid piles, the filled concrete enhances the stability of the metal piles, part of the concrete and soft soil are solidified to form a whole to improve the pile side friction resistance, and the piles Zhou Ruantu and the metal concrete piles form a composite foundation, so that the problems of slow drainage and solidification of the soft soil foundation, poor pile forming quality and insufficient bearing capacity are solved.
The technical scheme of the application is further described below:
in one embodiment, the electroosmotic drainage rigid pile assembly further comprises at least two filter plates, one of the metal piles is provided with at least one filter plate, and the filter plates are detachably attached to the circumferential outer side wall of the pile body and cover the water collecting through holes.
In one embodiment, the metal pile further comprises a pile head, the pile head is connected with one end, close to the opening, of the pile body, the outer diameter of the pile head is larger than that of the pile body, and the pile head is provided with a mounting through hole for inserting the filter plate.
In one embodiment, one end of the filter plate is inserted into the mounting through hole and protrudes relative to the pile head in a direction away from the pile cavity.
In one embodiment, the metal pile further comprises a pile end, wherein the pile end is connected with one end, far away from the opening, of the pile body, the outer diameter of the pile end is larger than that of the pile body, and one end, far away from the pile body, of the pile end is designed to be conical.
In one embodiment, the electroosmosis drainage rigid pile assembly further comprises an anode pile branch and a cathode pile branch which are arranged at intervals, wherein the anode pile branch comprises at least two metal piles which are arranged in series and are electrically connected with the positive electrode of the power supply; the cathode pile branch comprises at least two metal piles which are arranged in series and are electrically connected with the negative electrode of the power supply; the electroosmosis drainage rigid pile assembly further comprises a main drainage piece, wherein the main drainage piece is arranged between the anode pile branch and the cathode pile branch and is used for receiving water drained by each drainage piece in the anode pile branch and the cathode pile branch.
In one embodiment, at least two anode pile branches and at least two cathode pile branches are arranged, and the anode pile branches and the cathode pile branches are alternately arranged; the main drainage piece is provided with at least two, and one main drainage piece corresponds to one anode pile branch and one cathode pile branch.
In addition, the application also provides a construction method for the electroosmosis drainage rigid pile assembly, which comprises the following steps:
driving the electroosmotic drainage rigid pile assembly to a preset depth of a soil layer;
at least one metal pile is electrically connected with a power supply negative electrode, at least one metal pile is electrically connected with a power supply positive electrode, a power supply is started to form a direct current electric field between the metal pile electrically connected with the power supply negative electrode and the metal pile electrically connected with the power supply positive electrode, and meanwhile water in a pile cavity of the metal pile electrically connected with the power supply negative electrode is discharged by using a water discharging piece in the metal pile electrically connected with the power supply negative electrode;
when the drainage piece in the metal pile electrically connected with the power supply negative electrode is discharged without water, the drainage piece in the metal pile electrically connected with the power supply negative electrode is pulled out;
and pouring concrete into the pile cavity so that the concrete is filled in the pile cavity.
In the construction steps, a power supply is started to form a direct current electric field between a metal pile electrically connected with a power supply negative electrode and a metal pile electrically connected with a power supply positive electrode, and according to the electroosmosis principle, water in a soil body moves from one side of the metal pile electrically connected with the power supply positive electrode to one side of the metal pile electrically connected with the power supply negative electrode under the action of the electric field, so that the water in the soil body can be accumulated in a pile cavity of the metal pile electrically connected with the power supply negative electrode, and meanwhile, a drainage piece is used for draining water in the pile cavity of the metal pile electrically connected with the power supply negative electrode; after drainage is finished, concrete is poured into the pile cavity, the metal pile can play a role in isolation and protection for solidification of the concrete, so that the concrete achieves a better solidification effect, part of the concrete passes through the water collecting through holes to enter the soft soil foundation and form a whole with soft soil around the pile after solidification, so that the side friction resistance of the metal pile and the soft soil is improved, the pile forming quality is improved, the solidified concrete and the metal pile are combined to form a high-strength rigid pile, the stability of the metal pile is enhanced by the filled concrete, meanwhile, the constraint effect is generated on the filled concrete by the pile wall of the metal pile, the compression strength of the concrete is improved, and the bearing capacity of the pile is also improved. In general, electroosmosis improves the bearing capacity and the pile periphery friction resistance of soft soil, concrete is poured in the pile cavity of the metal pile to improve the bearing capacity and the pile periphery friction resistance of the pile body, a high-strength rigid pile is formed, the rigid pile and the pile periphery soil bear upper load together to form a composite foundation, and finally, the purposes of rapid drainage consolidation and soft soil foundation bearing capacity enhancement are achieved. The technical scheme of the application is further described below:
in one embodiment, the step of pouring concrete into the pile cavity so that the concrete is filled in the pile cavity comprises the steps of:
pouring concrete into the pile cavity so that the concrete is filled in the pile cavity;
and gradually pumping the filter plate away from the metal pile according to the pouring height of the concrete.
In one embodiment, when the drain member in the metal pile electrically connected to the power supply negative electrode is discharged without water, the step of extracting the drain member inserted in the metal pile electrically connected to the power supply negative electrode further includes the following steps:
turning off the power supply, and adjusting the anode and the cathode of the power supply so that the metal pile which is electrically connected with the anode of the power supply becomes electrically connected with the cathode of the power supply, and the metal pile which is electrically connected with the cathode of the power supply becomes electrically connected with the anode of the power supply;
connecting a drainage piece in the metal pile which is electrically connected with the negative electrode of the power supply to a water suction pump;
turning on the power supply again to form a direct current electric field between the metal pile electrically connected with the power supply negative electrode and the metal pile electrically connected with the power supply positive electrode, and discharging water in the pile cavity of the metal pile electrically connected with the power supply negative electrode by using the water discharging piece in the metal pile electrically connected with the power supply negative electrode;
when the drainage piece in the metal pile electrically connected with the power supply cathode is discharged without water, the drainage piece in the metal pile electrically connected with the power supply cathode is pulled out.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic cross-sectional view of an electroosmotic drainage rigid stake assembly according to one embodiment of the present invention;
FIG. 2 is a schematic view of section A-A of FIG. 1;
FIG. 3 is a schematic view of section B-B of FIG. 1;
FIG. 4 is a schematic view of section C-C of FIG. 1;
FIG. 5 is a schematic layout view of an anode pile leg, a cathode pile leg, and a main drain according to an embodiment of the present invention;
fig. 6 is a schematic view of a construction method for an electroosmotic drainage rigid pile assembly according to one embodiment of the present invention.
Reference numerals illustrate:
10. an electroosmotic drainage rigid pile assembly; 20. soft soil; 30. concrete; 40. a water pump; 50. a power supply; 100. a metal pile; 110. a pile body; 111. a pile cavity; 112. an opening; 113. a water collecting through hole; 120. a pile head; 121. mounting through holes; 130. a pile end; 140. a connector; 200. a drain member; 300. a filter plate; 400. an anode pile branch; 500. a cathode pile branch; 600. a main drain.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Referring to fig. 1 to 6, an electroosmotic drainage rigid pile assembly 10 according to an embodiment includes at least two metal piles 100 and at least two drainage members 200, wherein all the metal piles 100 are arranged at intervals, each metal pile 100 includes a pile body 110, a pile cavity 111 is formed in the pile body 110, an opening 112 communicated with the pile cavity 111 is formed in the pile body 110, a water collecting through hole 113 is formed in a circumferential side wall of the pile body 110, the water collecting through hole 113 is used for communicating the pile cavity 111 with the outside, at least one metal pile 100 is used for being electrically connected with an anode of a power supply 50, and at least one metal pile 100 is used for being electrically connected with a cathode of the power supply 50; a drain 200 corresponds to a metal pile 100, and the drain 200 is detachably inserted into the pile cavity 111.
When the electroosmosis drainage rigid pile assembly 10 is used, the metal pile 100 is inserted into soft soil 20, at least one metal pile 100 is electrically connected with the positive electrode of the power supply 50, and at least one metal pile 100 is electrically connected with the negative electrode of the power supply 50, so that a direct current electric field is formed between the metal pile 100 electrically connected with the positive electrode of the power supply 50 and the metal pile 100 electrically connected with the negative electrode of the power supply 50 in a soft soil foundation, the metal pile 100 electrically connected with the negative electrode of the power supply 50 is a cathode metal pile, the metal pile 100 electrically connected with the positive electrode of the power supply 50 is an anode metal pile, and according to the electroosmosis principle, moisture in a soil body moves from one side of the anode metal pile to one side of the cathode metal pile under the action of the electric field, water in the soil body can be gathered in the pile cavity 111 of the cathode metal pile, and then the water in the pile cavity 111 is drained out of the pile cavity 111 through the drainage piece 200 in the pile cavity 111, so that the purposes of quickly reducing the water content of the soft soil foundation, quickly solidifying the soil body and improving the bearing capacity of the soft soil foundation are achieved; after the drainage is completed, the drainage piece 200 inside the pile cavity 111 is disassembled, filling media such as concrete 30 and the like are poured into the pile cavity 111, and the metal pile 100 can play a role in isolation and protection for solidification of the filling media such as concrete 30 and the like, so that better solidification effect is achieved for the filling media such as concrete 30 and the like, the solidified concrete 30 and the metal pile 100 are combined to form a high-strength rigid pile, part of filling media penetrate through the water collecting through holes 113 to enter a soft soil foundation and form a whole with soft soil 20 around the pile after solidification, and therefore side friction resistance of the metal pile 100 and soft soil 20 is improved, and pile forming quality is improved.
In general, electroosmosis promotes the quick drainage and solidification of the piles Zhou Ruantu, the pile body of the metal pipe improves the solidification effect and pile forming quality of the concrete 30 in the piles, the metal piles 100 are combined with the concrete 30 to form high-strength rigid piles, the filled concrete 30 enhances the stability of the metal piles 100, part of the concrete 30 and the soft soil 20 are integrated into a whole to improve the pile side friction resistance, the piles Zhou Ruantu and the metal concrete 30 piles form a composite foundation, and the problems of slow drainage and solidification of the soft soil foundation, poor pile forming quality and insufficient bearing capacity are solved.
Further, referring to fig. 1, the metal pile 100 further includes a connector 140, and the connector 140 of the metal pile 100 is electrically connected to the positive electrode or the negative electrode of the power source 50 through a wire (not shown). Specifically, the wire can be a copper core insulated wire or an aluminum core insulated wire, one end of the wire is connected with a positive electrode or a negative electrode of a power supply, the other end of the wire is connected with the metal pile 100 in a winding way, and an insulating protective layer is externally attached to the connecting part to ensure construction safety, and the thickness of the wire is determined according to the conductivity of a soil body and the distance between adjacent metal piles 100.
Further, referring to fig. 1 and 6, the drain 200 is suspended and inserted into the pile cavity 111 such that the bottom end of the drain 200 is spaced from the bottom of the pile cavity 111 to prevent the water inlet (not shown) of the drain 200 from being blocked. Specifically, the drain 200 is connected to the metal pile 100 by wire winding so that the drain 200 is suspended and inserted inside the pile cavity 111.
Further, the drain 200 may be any existing drain. Preferably, the drain 200 is a PVC drain or a PE drain.
Further, the power supply 50 may be a regulated dc power supply, which can provide stable voltage and current for the metal pile 100, and can display the voltage and current change condition in the soil in real time.
Further, the cross-sectional shape of the metal stake 100 may be circular, square or any other shape. Preferably, referring to fig. 1 to 5, the cross-sectional shape of the metal stake 100 is circular.
In some embodiments, referring to fig. 1 to 5, the electroosmotic drainage rigid pile assembly 10 further includes at least two filter plates 300, one metal pile 100 is provided with at least one filter plate 300, and the filter plates 300 are detachably attached to the circumferential outer side wall of the pile body 110 and cover the water collecting through holes 113, so that when the moisture in the soil body permeates into the pile cavity 111 of the cathode metal pile, the filter plates 300 can filter soil in the water, preventing the water collecting through holes 113 from being blocked.
Further, the filter plate 300 may be any existing filter plate, as long as it can pass water in soil and filter soil. Preferably, a plastic drain plate or a metal drain plate is used as the filter sheet 300.
Further, the filter sheet 300 may be detachably attached to the circumferential outer side wall of the pile body 110 in any conventional attaching manner. Preferably, the epoxy adhesive is used to adhere the filter plate 300 to the circumferential outer sidewall of the pile body 110 and cover the water collecting through hole 113, and the adhesion mode is two-point adhesion, so that the adhesion strength of the epoxy adhesive in two-point adhesion can enable the filter plate 300 to be adhered to the circumferential outer sidewall of the pile body 110, and the filter plate 300 can be conveniently detached from the pile body 110 in the later construction period.
In some embodiments, referring to fig. 1 to 6, at least two water collecting through holes 113 are formed in one metal pile 100 along the circumferential direction of the circumferential side wall, one metal pile 100 is provided with at least two filter plates 300, all filter plates 300 are distributed along the circumferential direction of the circumferential side wall of the metal pile 100, and the positions and the number of the filter plates 300 distributed along the circumferential direction of the metal pile 100 correspond to the positions and the number of the water collecting through holes 113 distributed along the circumferential direction of the metal pile 100, so that water in soil around the metal pile 100 can enter the pile cavity 111 through the water collecting through holes 113, uniformity of water content of soft soil foundation around the metal pile 100 after electroosmosis is finished is improved, and water collecting efficiency of the metal pile 100 is improved.
Further, referring to fig. 2 to 4, the water collecting through holes 113 are uniformly distributed on the circumferential side wall of the metal pile 100 along the circumferential direction, and the filter plates 300 are also uniformly distributed on the circumferential side wall of the metal pile 100 along the circumferential direction, so as to further improve the uniformity of the water content of the soft soil foundation around the metal pile 100 after the electroosmosis is finished.
In some embodiments, referring to fig. 1 and 6, at least two water collecting through holes 113 are formed in the circumferential side wall of one metal pile 100 along the length direction (L direction as shown in fig. 1 and 6) of the metal pile 100, so that water in the soil along the length direction of the metal pile 100 can enter the pile cavity 111 through the water collecting through holes 113, uniformity of water content of the soft soil foundation along the length direction of the metal pile 100 after electroosmosis is finished is improved, and water collecting efficiency of the metal pile 100 is improved.
Preferably, referring to fig. 1 to 4, at least two water collecting through holes 113 are formed in the circumferential side wall of one metal pile 100 along the circumferential direction, and at least two water collecting through holes 113 are also formed along the length direction of the metal pile 100.
Further, the water collecting through hole 113 may be a circular through hole, an elliptical through hole, a square through hole, or other shaped through holes. Preferably, the water collecting through hole 113 is a circular through hole.
In some embodiments, referring to fig. 1 and 6, the metal pile 100 further includes a pile head 120, the pile head 120 is connected to one end of the pile body 110 near the opening 112, the pile head 120 has an outer diameter larger than that of the pile body 110, and the pile head 120 is provided with a mounting through hole 121 for inserting the filter plate 300. When the metal pile 100 is driven into the soft soil 20, the pile head 120 faces upwards, and the diameter of the pile head 120 is larger than that of the pile body 110 so as to enlarge the contact area between the metal pile 100 and the pile driver in the driving process, namely, the pile head 120 with larger area is in direct contact with the pile driver, so that the pressure intensity of the pile body 110 is reduced, and the deformation and damage of the pile body 110 in the driving process are avoided; the mounting through-holes 121 formed in the pile head 120 are used for inserting and fixing the filter plate 300, and the filter plate 300 can be drawn out through the mounting through-holes 121 when the concrete 30 is poured into the pile cavity 111 at a later stage.
Further, referring to fig. 1 to 4, in one metal pile 100, the pile head 120 is provided with at least two mounting through holes 121, all the mounting through holes 121 are distributed along the circumferential direction of the circumferential side wall of the metal pile 100, and the positions and the number of the mounting through holes 121 distributed along the circumferential direction of the circumferential side wall of the metal pile 100 correspond to the positions and the number of the water collecting through holes 113 distributed along the circumferential direction of the circumferential side wall of the metal pile 100. Preferably, the installation through holes 121 and the water collecting through holes 113 are each provided with four or six and are uniformly distributed along the circumference of the circumferential side wall of the metal pile 100.
Further, the cross-sectional shape of the mounting through-hole 121 is adapted to the cross-sectional shape of the filter sheet 300, and the mounting through-hole 121 may be a circular through-hole, an elliptical through-hole, a square through-hole, or another shaped through-hole. Preferably, the cross-sectional shape of filter sheet 300 is set to be square, mounting through-holes 121 are also set to be square through-holes, and the length and width of the cross-sectional shape of mounting through-holes 121 are each larger than the length and width of the cross-sectional shape of filter sheet 300, respectively, so that filter sheet 300 can be easily withdrawn from mounting through-holes 121.
Further, referring to fig. 1 to 4, the thickness of the drainage plate (the thickness direction is the radial direction of the metal pile 100) should be smaller than the difference between the outer radius of the pile body 110 and the outer radius of the pile head 120, so as to prevent the drainage plate from falling off due to friction with the soil during piling.
In some embodiments, referring to fig. 1, one end of filter plate 300 is inserted through mounting hole 121 and protrudes from pile head 120 in a direction away from pile cavity 111, so that the length of filter plate 300 (the length direction is L direction as shown in fig. 1 and 6) is longer than the length of pile body 110 (the length direction is L direction as shown in fig. 1 and 6), and filter plate 300 can be conveniently pulled out from pile body 110 by holding one end of filter plate 300 protruding from pile head 120 in a direction away from pile cavity 111.
In some embodiments, referring to fig. 1 and 6, the metal pile 100 further includes a pile end 130, the pile end 130 is connected to an end of the pile body 110 away from the opening 112, the pile end 130 has an outer diameter larger than an outer diameter of the pile body 110, and an end of the pile end 130 away from the pile body 110 is tapered. When the metal pile 100 is driven into soil, the pile end 130 faces downwards, and the diameter of the pile end 130 is larger than that of the pile body 110, so that the pile end 130 can form an enlarged space on the side wall of the pile body 110 in the driving process, and the filter plate 300 attached to the circumferential outer side wall of the pile body 110 is prevented from being damaged or falling off due to friction with surrounding soil; the end of the pile end 130 far away from the pile body 110 is designed to be conical, so that the resistance of soil near the pile end 130 to the metal pile during piling can be effectively reduced.
In some embodiments, referring to fig. 5, the electroosmotic drainage rigid pile assembly 10 further comprises an anode pile branch 400 and a cathode pile branch 500 arranged at intervals, wherein the anode pile branch 400 comprises at least two metal piles 100 arranged in series and each used for being electrically connected with the positive electrode of the power supply 50; the cathode pile branch 500 includes at least two metal piles 100 arranged in series and each used for electrically connecting with the negative electrode of the power supply 50; the electroosmotic drainage rigid pile assembly 10 further comprises a main drainage member 600, the main drainage member 600 being arranged between the anode pile leg 400 and the cathode pile leg 500, the main drainage member 600 being adapted to take in water drained by each drainage member 200 in the anode pile leg 400 and the cathode pile leg 500. Thus, through the positive electric connection of the anode pile branch 400 and the power supply 50, and the negative electric connection of the cathode pile branch 500 and the negative electric connection of the power supply 50, a direct current electric field can be formed between the anode pile branch 400 and the cathode pile branch 500, and water in soil moves to one side of the cathode pile branch 500 under the action of electroosmosis, so that the pile cavities 111 of the plurality of metal piles 100 in the cathode pile branch 500 can collect water in soil at the same time and discharge the water through the main drainage piece 600, and the water collecting efficiency and the drainage efficiency are greatly improved.
Further, referring to fig. 5, one end of the main drain 600 is connected to the water pump 40, the other end of the main drain 600 is connected to the drain 200, and the water pump 40 pumps water in the pile cavity 111 away from the metal pile 100 through the main drain 600 and the drain 200. Specifically, the main drain 600 is connected to the drain 200 through a three-way valve (not shown).
In some embodiments, referring to fig. 5, at least two anode pile branches 400 and at least two cathode pile branches 500 are provided, and the anode pile branches 400 and the cathode pile branches 500 are alternately arranged; at least two main drains 600 are provided, and one main drain 600 corresponds to one anode leg 400 and one cathode leg 500. By arranging at least two anode pile branches 400 and at least two cathode pile branches 500, the pile cavities 111 of the metal piles 100 in the cathode pile branches 500 can collect water in soil body at the same time and drain the water through the main drainage piece 600, so that the water collecting efficiency and the drainage efficiency are greatly improved; the anode pile branches 400 and the cathode pile branches 500 are alternately arranged, namely, one cathode pile branch 500 is arranged between two adjacent anode pile branches 400, so that direct current electric fields can be formed at two sides of the cathode pile branches 500, and the water collection efficiency is improved.
Further, referring to fig. 5, all the main drainage members 600 are connected to the same water pump 40, all the anode pile branches 400 and the cathode pile branches 500 are electrically connected to the positive electrode and the negative electrode of the same power source 50, so that the drainage states of all the drainage members 200 connected to the water pump 40 can be simultaneously controlled by controlling one water pump 40, and the working states of all the anode pile branches 400 and the cathode pile branches 500 can be simultaneously controlled by controlling one power source 50, thereby facilitating the simultaneous operation of all the metal piles 100 and all the drainage members 200 and ensuring the uniform water content distribution of the soft soil foundation in the operation range.
On the other hand, referring to fig. 1 to 6, an embodiment further includes a construction method for an electroosmotic drainage rigid pile assembly 10, including the steps of:
driving the electroosmotic drainage rigid pile assembly 10 to a predetermined depth in the soil layer;
at least one metal pile 100 is electrically connected with the negative electrode of the power supply 50, at least one metal pile 100 is electrically connected with the positive electrode of the power supply 50, the power supply 50 is started to form a direct current electric field between the metal pile 100 electrically connected with the negative electrode of the power supply 50 and the metal pile 100 electrically connected with the positive electrode of the power supply 50, and meanwhile, water in a pile cavity 111 of the metal pile 100 electrically connected with the negative electrode of the power supply 50 is discharged by using a drainage piece 200 in the metal pile 100 electrically connected with the negative electrode of the power supply 50;
when the drainage member 200 in the metal pile 100 electrically connected with the negative electrode of the power supply 50 is discharged without water, the drainage member 200 in the metal pile 100 electrically connected with the negative electrode of the power supply 50 is pulled out;
concrete 30 is poured into the pile cavity 111 so that the concrete 30 is filled in the pile cavity 111.
In the above construction steps, the power supply 50 is turned on to form a direct current electric field between the metal pile 100 electrically connected to the negative electrode of the power supply 50 and the metal pile 100 electrically connected to the positive electrode of the power supply 50, and according to the electroosmosis principle, moisture in the soil body moves from one side of the metal pile 100 electrically connected to the positive electrode of the power supply 50 to one side of the metal pile 100 electrically connected to the negative electrode of the power supply 50 under the action of the electric field, so that moisture in the soil body can be accumulated inside the pile cavity 111 of the metal pile 100 electrically connected to the negative electrode of the power supply 50, and meanwhile, the water in the pile cavity 111 of the metal pile 100 electrically connected to the negative electrode of the power supply 50 is discharged by using the drainage member 200; after the water drainage is finished, concrete 30 is poured into the pile cavity 111 of the metal pile 100 electrically connected with the positive electrode of the power supply 50 and the pile cavity 111 of the metal pile 100 electrically connected with the negative electrode of the power supply 50, namely, concrete 30 is poured into the pile cavities 111 of all the metal piles 100, the metal piles 100 can play a role in isolating and protecting the solidification of the concrete 30, so that the concrete 30 achieves a better solidification effect, part of the concrete 30 enters a soft soil foundation through the water collecting through holes 113 and forms a whole with soft soil 20 around the pile after being solidified, thereby improving the side friction resistance of the metal pile 100 and the soft soil 20, improving the pile forming quality, combining the concrete 30 and the metal pile 100 after being solidified to form a high-strength rigid pile, the stability of the metal pile 100 is enhanced by the filled concrete 30, meanwhile, the pile wall of the metal pile 100 has a constraint effect on the filled concrete 30, the compression strength of the concrete 30 is improved, and the bearing capacity of the pile is also improved. In general, the electroosmosis improves the bearing capacity and the pile periphery friction resistance of the soft soil 20, the pile cavity 111 of the metal pile 100 is internally poured with concrete 30 to improve the pile body bearing capacity and the pile periphery friction resistance, and a high-strength rigid pile is formed, and the rigid pile and the pile periphery soil bear upper load together to form a composite foundation, so that the purposes of rapid drainage consolidation and soft soil foundation bearing capacity enhancement are finally achieved.
In some embodiments, referring to fig. 6, the step of pouring concrete 30 into the pile cavity 111 to fill the pile cavity 111 with the concrete 30 includes the following steps:
pouring concrete 30 into the pile cavity 111 so that the concrete 30 is filled in the pile cavity 111;
filter plate 300 is gradually pulled away from metal pile 100 according to the poured height of concrete 30.
In the above construction steps, compared with the construction method of completely withdrawing the filter plate 300 and then re-pouring the concrete 30, gradually withdrawing the filter plate 300 from the metal pile 100 according to the pouring height of the concrete 30 can reduce the number of the water collecting through holes 113 blocked by the piles Zhou Ruantu in the process of pouring the concrete, and can enable the concrete 30 to pass through as many water collecting through holes 113 as possible to enter the soft soil foundation so as to be condensed with the piles Zhou Ruantu to form a whole, thereby improving the side friction resistance of the metal pile 100 and the soft soil 20 as much as possible and improving the pile forming quality.
In some embodiments, referring to fig. 5, when the drainage member 200 in the metal pile 100 electrically connected to the negative electrode of the power source 50 is drained without water, the step of extracting the drainage member 200 inserted in the metal pile 100 electrically connected to the negative electrode of the power source 50 further comprises the following steps:
turning off the power supply 50, and adjusting the anode and the cathode of the power supply 50 so that the metal pile 100 which is electrically connected with the anode of the power supply 50 becomes electrically connected with the cathode of the power supply 50, and the metal pile 100 which is electrically connected with the cathode of the power supply 50 becomes electrically connected with the anode of the power supply 50;
connecting the drain 200 in the metal pile 100, which is currently electrically connected to the negative electrode of the power supply 50, to the water pump 40;
turning on the power supply 50 again to form a direct current electric field between the metal pile 100 currently electrically connected with the negative electrode of the power supply 50 and the metal pile 100 currently electrically connected with the positive electrode of the power supply 50, and simultaneously discharging water in the pile cavity 111 of the metal pile 100 currently electrically connected with the negative electrode of the power supply 50 by using the drain 200 in the metal pile 100 currently electrically connected with the negative electrode of the power supply 50;
when the drain 200 in the metal pile 100 currently electrically connected to the negative electrode of the power supply 50 is discharged without water, the drain 200 in the metal pile 100 currently electrically connected to the negative electrode of the power supply 50 is pulled out.
In the above construction steps, after one electroosmosis is finished, the anode and the cathode of the power supply 50 are regulated and electroosmosis is carried out again, so that the water content of the soil body around the metal pile 100 which is electrically connected with the anode of the power supply 50 originally can be reduced, and the uniformity of the water content of the whole soft soil foundation is improved.
In some embodiments, referring to fig. 5, the step of driving the electroosmotic drainage rigid pile assembly 10 to a predetermined depth in the soil layer includes the steps of:
driving the electroosmotic drainage rigid pile assembly 10 to a predetermined depth in the soil layer;
when serious soil squeezing effect occurs in the piling process, at least one metal pile 100 is electrically connected with the negative electrode of the power supply 50, at least one metal pile 100 is electrically connected with the positive electrode of the power supply 50, piling is stopped, the power supply 50 is started to form a direct current electric field between the metal pile 100 electrically connected with the negative electrode of the power supply 50 and the metal pile 100 electrically connected with the positive electrode of the power supply 50, meanwhile, water in a pile cavity 111 of the metal pile 100 electrically connected with the negative electrode of the power supply 50 is discharged by using a drainage piece 200 in the metal pile 100 electrically connected with the negative electrode of the power supply 50, and after the soil squeezing effect is reduced or eliminated, the electrical connection between the positive electrode and the negative electrode of the power supply 50 and the metal pile 100 is disconnected, and piling is continued. The above steps can be performed repeatedly, so that electroosmosis and drainage can be performed by combining the metal piles 100 repeatedly in the piling process, the super pore water pressure can be dissipated by utilizing the electroosmosis drainage, the soil squeezing effect generated during piling and the resistance suffered by the pile ends 130 are weakened, and the influence of piling on the existing pipelines, pile bodies and other buildings is reduced.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
In the present invention, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be in either fixed or removable communication, or may be integral, for example; may be in mechanical communication or in electrical communication; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "in communication with" another element, it can be directly in communication with the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The foregoing examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. An electroosmotic drainage rigid pile assembly, comprising:
the pile comprises a pile body, wherein a pile cavity is arranged in the pile body, an opening communicated with the pile cavity is formed in the pile body, a water collecting through hole is formed in the circumferential side wall of the pile body and used for communicating the pile cavity with the outside, at least one metal pile is used for being electrically connected with a positive electrode of a power supply, and at least one metal pile is used for being electrically connected with a negative electrode of the power supply;
at least two drainage pieces, one drainage piece corresponds to one metal pile, the drainage piece detachably inserts and locates in the stake pocket is inside.
2. The electroosmotic drainage rigid pile assembly according to claim 1, further comprising at least two filter plates, one of the metal piles being provided with at least one of the filter plates, the filter plates being removably attached to the circumferential outer side wall of the pile body and covering the water collection through-holes.
3. The electroosmotic drainage rigid pile assembly according to claim 2, wherein the metal pile further comprises a pile head connected to one end of the pile body adjacent to the opening, the pile head having an outer diameter greater than the outer diameter of the pile body, the pile head being provided with a mounting through hole for inserting the filter plate.
4. An electroosmotic drainage rigid pile assembly according to claim 3, wherein one end of the filter plate is disposed through the mounting aperture and projects relative to the pile head in a direction away from the pile cavity.
5. An electroosmotic drainage rigid pile assembly according to any one of claims 2 to 4, wherein the metal pile further comprises a pile end connected to the end of the pile body remote from the opening, the pile end having an outer diameter greater than the outer diameter of the pile body, the end of the pile end remote from the pile body being tapered.
6. The electroosmotic drainage rigid pile assembly according to any one of claims 2 to 4, further comprising spaced apart anode and cathode pile branches, the anode pile branches comprising at least two of the metal piles arranged in series and each for electrical connection with a positive electrode of a power source; the cathode pile branch comprises at least two metal piles which are arranged in series and are electrically connected with the negative electrode of the power supply;
the electroosmosis drainage rigid pile assembly further comprises a main drainage piece, wherein the main drainage piece is arranged between the anode pile branch and the cathode pile branch and is used for receiving water drained by each drainage piece in the anode pile branch and the cathode pile branch.
7. The electroosmotic drainage rigid pile assembly according to claim 6, wherein at least two of the anode pile branches and the cathode pile branches are provided, and the anode pile branches and the cathode pile branches are alternately arranged; the main drainage piece is provided with at least two, and one main drainage piece corresponds to one anode pile branch and one cathode pile branch.
8. A construction method for an electroosmotic drainage rigid pile assembly according to any one of claims 2 to 7, comprising the steps of:
driving the electroosmotic drainage rigid pile assembly to a preset depth of a soil layer;
at least one metal pile is electrically connected with a power supply negative electrode, at least one metal pile is electrically connected with a power supply positive electrode, a power supply is started to form a direct current electric field between the metal pile electrically connected with the power supply negative electrode and the metal pile electrically connected with the power supply positive electrode, and meanwhile water in a pile cavity of the metal pile electrically connected with the power supply negative electrode is discharged by using a water discharging piece in the metal pile electrically connected with the power supply negative electrode;
when the drainage piece in the metal pile electrically connected with the power supply negative electrode is discharged without water, the drainage piece in the metal pile electrically connected with the power supply negative electrode is pulled out;
and pouring concrete into the pile cavity so that the concrete is filled in the pile cavity.
9. The construction method according to claim 8, wherein the step of pouring concrete into the pile cavity so that the concrete is filled in the pile cavity comprises the steps of:
pouring concrete into the pile cavity so that the concrete is filled in the pile cavity;
and gradually pumping the filter plate away from the metal pile according to the pouring height of the concrete.
10. The construction method according to claim 8, wherein the step of extracting the drain inserted in the metal pile electrically connected to the negative electrode of the power supply further comprises, when the drain in the metal pile electrically connected to the negative electrode of the power supply is discharged without water, the steps of:
turning off the power supply, and adjusting the anode and the cathode of the power supply so that the metal pile which is electrically connected with the anode of the power supply becomes electrically connected with the cathode of the power supply, and the metal pile which is electrically connected with the cathode of the power supply becomes electrically connected with the anode of the power supply;
connecting a drainage piece in the metal pile which is electrically connected with the negative electrode of the power supply to a water suction pump;
turning on the power supply again to form a direct current electric field between the metal pile electrically connected with the power supply negative electrode and the metal pile electrically connected with the power supply positive electrode, and discharging water in the pile cavity of the metal pile electrically connected with the power supply negative electrode by using the water discharging piece in the metal pile electrically connected with the power supply negative electrode;
and when the drainage piece in the metal pile electrically connected with the power supply negative electrode at present is discharged without water, the drainage piece in the metal pile electrically connected with the power supply negative electrode at present is pulled out.
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| JP2584421B2 (en) * | 1987-08-25 | 1997-02-26 | 珍彦 山嵜 | Forced water collection method applying electroosmosis phenomenon |
| CN105297704B (en) * | 2015-11-05 | 2017-03-29 | 浙江大学城市学院 | A kind of electric osmose strengthens stake reinforcing flexible foundation device and construction method |
| CN208586600U (en) * | 2017-08-03 | 2019-03-08 | 郭晓 | A kind of Soft Ground structure |
| CN107630450B (en) * | 2017-10-18 | 2019-11-12 | 河海大学 | A kind of carbon-fiber cement mixing pile joint electro-osmosis method reinforcing flexible foundation construction method |
| CN109811758B (en) * | 2019-03-14 | 2024-01-16 | 宁波大学 | Electroosmosis composite foundation and construction method thereof |
| CN109811759B (en) * | 2019-03-14 | 2023-10-24 | 宁波大学 | Electric reaction pile and manufacturing method thereof |
| CN110593247A (en) * | 2019-09-27 | 2019-12-20 | 宁波大学 | Electroosmotic gravel grouting pile and construction method thereof |
| CN111088807A (en) * | 2020-01-16 | 2020-05-01 | 天津城建大学 | Be applied to reinforced (rfd) electrode stake of rubble side slope prevention of seepage and bank protection system |
| CN212153434U (en) * | 2020-03-31 | 2020-12-15 | 贵州民族大学 | Electroosmosis blowdown tubular pile that permeates water |
| CN212477687U (en) * | 2020-08-28 | 2021-02-05 | 浙大城市学院 | Device for treating soft foundation by combining lime-soil compaction pile with electroosmosis method |
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