CN113482624A

CN113482624A - Construction method for directly starting and arriving shield by using electric erosion pile core

Info

Publication number: CN113482624A
Application number: CN202110748325.8A
Authority: CN
Inventors: 解萍; 杨旭明; 杨启双; 曹磊; 曹健
Original assignee: Jiangsu Xurui Heavy Industry Technology Co ltd
Current assignee: Jiangsu Xurui Heavy Industry Technology Co ltd
Priority date: 2021-06-30
Filing date: 2021-06-30
Publication date: 2021-10-08
Anticipated expiration: 2041-06-30
Also published as: CN113482624B

Abstract

The invention provides a construction method for directly starting and arriving a shield by using an electrolytic corrosion pile core, which comprises the following steps: arranging a pile core on the retaining wall; the pile core and the copper bar arranged in the pile core are connected with the anode and the cathode of the power supply; electroerosion pile core, collecting the generated hydrogen, filtering the generated precipitate, and reusing the electrolyte solution; and after the electric corrosion work is finished, cutting the concrete structure in the retaining wall. The invention aims to solve the technical problem of providing a construction method for directly starting and arriving a shield by using an electrolytic corrosion pile core, which is a construction method that a pile core material is used as an anode, the pile core material with high strength in a retaining wall is quickly dissolved by applying large current, and the residual pile body material is directly cut by a shield machine. The processes of foundation reinforcement, manual removal of the retaining wall and the like are omitted, and meanwhile, the material of the pile core can be recycled and can generate extra hydrogen, so that the safety is improved, and the engineering cost is also saved.

Description

Construction method for directly starting and arriving shield by using electric erosion pile core

Technical Field

The invention discloses a construction method for direct starting and arrival of a shield, relates to the technical field of engineering, and particularly relates to the field of analysis of a construction method for direct starting and arrival of a shield by using an electric erosion pile core.

Background

The conventional method for preventing soil collapse during the starting and arrival of the shield machine at present is to carry out large-area and large-depth foundation reinforcement treatment in advance on the starting arrival side of a working well. After the foundation reinforcement reaches the design strength, the retaining wall structure is dismantled by manual work and other modes, and the soil layer is opened to allow the shield machine or the pipe jacking machine to enter. The construction method has the advantages of long time and high risk for reinforcing and removing the retaining wall structure.

Disclosure of Invention

The invention aims to solve the technical problem of providing a construction method for directly starting and arriving a shield by using an electrolytic corrosion pile core, which is a construction method that a pile core material is used as an anode, the pile core material with high strength in a retaining wall is quickly dissolved by applying large current, and the residual pile body material is directly cut by a shield machine. The processes of foundation reinforcement, manual removal of the retaining wall and the like are omitted, and meanwhile, the material of the pile core can be recycled and can generate extra hydrogen, so that the safety is improved, and the engineering cost is also saved.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a construction method for directly starting and arriving a shield by an electrolytic corrosion pile core comprises the following steps:

step 1: the method comprises the following steps that a plurality of pile cores in the vertical direction are arranged on a retaining wall, the pile cores are hollow, an upper insulating layer and a lower insulating layer are arranged on the pile cores, the upper insulating layer and the lower insulating layer separate the pile cores into three parts which are not in contact with each other, and the upper insulating layer and the lower insulating layer are respectively positioned above and below a to-be-dissolved area for a shield machine to pass through;

step 2: the pile core between the upper and lower insulating layers is connected with the anode of a power supply arranged on the ground through a cable, a copper bar is arranged in the pile core, the copper bar is connected with the cathode of the power supply through the cable, the power supply is switched on, the pile core is electroeroded, and precipitates, namely ferric hydroxide and hydrogen are generated in the electroerosion process;

and step 3: a circulating pump is arranged at the bottom of each pile core, the circulating pump pumps electrolyte conditioning liquid mixed with ferric hydroxide in the pile core, the electrolyte conditioning liquid mixed with the ferric hydroxide is separated from ferric hydroxide by a ground ferric hydroxide separation station through a circulating pipeline and then enters an electrolyte conditioning pool, the electrolyte conditioning liquid of the electrolyte conditioning pool extends into the pile core through an overflow pipeline, and electrolyte conditioning liquid is recycled;

and 4, step 4: the top of the pile core is provided with a hydrogen collecting pipeline which is connected with a hydrogen compression device on the ground and used for compressing hydrogen generated in the pile core into a bottle;

and 5: after the electric corrosion work is finished, the power supply is closed, and the electrolyte conditioning liquid in the pile core is recovered;

step 6: the shield machine cuts the concrete structure in the retaining wall to finish the shield starting or arrival construction.

Preferably, the pile core is in the shape of a cylinder or a cube.

Preferably, the insulating layer is fused with the pile core in step 1.

Wherein, the electrochemical formula of the electrolytic corrosion in the step 2 is as follows:

2Fe+6H₂O→2Fe(OH)₃↓+3H₂↑(1)。

preferably, before the electric corrosion process in the step 2 is carried out, in order to prevent the soil body from collapsing possibly in the electric corrosion process, the shield machine is firstly jacked in and is tightly attached to the retaining wall.

Preferably, in the step 2, the copper bar is sleeved with a plurality of insulating rings, and when collision occurs, the insulating rings are firstly contacted with the pile core, so that the influence on the conductivity of the copper bar is avoided.

Preferably, in the step 3, during the circulation pump pumping the electrolyte conditioning solution mixed with the ferric hydroxide in the pile core, an air compressor on the ground is used for ventilating the bottom of the pile core, so as to accelerate the circulation of the electrolyte solution and make the precipitate ferric hydroxide roll, thereby facilitating the electrolyte conditioning solution mixed with the ferric hydroxide to be pumped by the circulation pump.

Further, the electrolyte regulating solution comprises metal ions and metal anions, wherein the metal cations comprise any one or two of sodium ions and potassium ions, and the anions comprise any one or more of chloride ions, acetate ions and sulfate ions.

Further, in order to uniformly perform the electrolytic corrosion process, a distance adjustment formula is adopted to dynamically adjust the distance between the copper rod and the pile core in the electrolytic corrosion process.

Wherein, the distance adjustment formula is as follows:

(1) when the electrolytic corrosion is carried out for a time t less than or equal to the initial stage t1 of the electrolytic corrosion,

wherein Li represents the distance between the copper rod and the pile core in the ith pile core, i is any natural number between 1 and n, h1 represents the height of the pile core between two insulators, h2 represents the height of the copper rod, t1 is the time required by the initial stage of the galvanic corrosion and is a constant, and t represents the time for the current galvanic corrosion;

(2) when the initial stage t1 of the electric erosion is less than the electric erosion proceeding time t is less than the electric erosion tail stage t2,

whereinAnd Δ Vi represents the voltage change between the copper rod and the pile core in the ith pile core in the time period Δ t,

the method comprises the steps of representing the average value of voltage changes between copper rods and pile cores in all pile cores in a delta t time period, K1 representing a preset lower limit proportion of the voltage changes, wherein the preset lower limit proportion is constant, K2 representing a preset upper limit proportion of the voltage changes, wherein the preset upper limit proportion is constant, and t2 is the time required by an electric erosion tail sound stage and is constant;

(3) when the proceeding time t of the electric erosion is more than or equal to the electric erosion tail sound stage t2,

the invention has the beneficial effects that:

1. The construction method provided by the invention has the advantages that the pile core material with high strength in the retaining wall is quickly dissolved by applying large current, and the residual pile body material is directly cut by the shield machine, so that the cutting work efficiency of the shield machine is greatly improved, and the cost is saved.

2. According to the invention, the insulating ring is additionally arranged on the copper bar, so that the copper bar and the pile core can be prevented from colliding, and the electric conductivity of the copper bar cannot be greatly influenced.

3. The invention increases the air compressor to ventilate the bottom of the pile core to accelerate the circulation of the electrolyte solution, and the air compressor on the ground ventilates the bottom of the pile core to accelerate the circulation of the electrolyte solution and roll the sediment iron hydroxide, so that the electrolyte conditioning solution mixed with the iron hydroxide is convenient to be pumped by the circulating pump.

4. The distance between the copper bar and the pile core is dynamically adjusted through a distance adjusting formula, so that the electrolytic corrosion process is promoted to be more uniformly and effectively carried out.

Drawings

FIG. 1 is a schematic view of the retaining wall construction of the present invention;

FIG. 2 is a schematic diagram of an electroerosion structure of a stake core of the present invention;

FIG. 3 is a schematic view of the construction of a stake core and upper and lower insulation layers of the present invention;

fig. 4 is a top view of a pile core of the present invention.

1-retaining wall, 2-pile core, 3-to-be-dissolved area, 4-insulating layer, 5-circulating pump, 6-circulating pipeline, 7-ferric hydroxide separating station, 8-electrolyte adjusting pool, 9-overflow pipeline, 10-hydrogen compression device, 11-hydrogen collecting pipeline, 12-cable, 13-power supply and 14-copper bar.

Detailed Description

The method for directly launching and arriving a shield by using an electric erosion pile core according to the present invention is further described in detail with reference to the accompanying drawings and the specific embodiments.

Example 1

As shown in fig. 1-4, a method for directly launching and arriving a shield by an electric erosion pile core includes the following steps:

step 1: the method comprises the following steps that a plurality of pile cores 2 in the vertical direction are arranged on a retaining wall 1, the pile cores 2 are hollow, an upper insulating layer 4 and a lower insulating layer 4 are arranged on the pile cores 2, the upper insulating layer 4 and the lower insulating layer 4 separate the pile cores 2 into three parts which are not in contact with each other, and the upper insulating layer 4 and the lower insulating layer 4 are respectively positioned above and below a region to be dissolved 3 for a shield machine to pass through;

step 2: the pile core 2 between the upper and lower insulating layers 4 is connected with the anode of a power supply 13 arranged on the ground through a cable 12, a copper bar 14 is arranged in the pile core 2, the copper bar 14 is connected with the cathode of the power supply 13 through the cable 12, the power supply 13 is switched on, the pile core 2 is electroeroded, and precipitates, namely ferric hydroxide and hydrogen are generated in the electroerosion process;

and step 3: a circulating pump 5 is placed at the bottom of each pile core 2, after the circulating pump 5 pumps electrolyte conditioning liquid mixed with ferric hydroxide in the pile core 2, the electrolyte conditioning liquid mixed with the ferric hydroxide is separated from ferric hydroxide by a ground ferric hydroxide separation station 7 through a circulating pipeline 6 and then enters an electrolyte conditioning pool 8, the electrolyte conditioning liquid in the electrolyte conditioning pool 8 extends into the pile core 2 through an overflow pipeline 9, and the electrolyte conditioning liquid is recycled;

and 4, step 4: a hydrogen collecting pipeline 11 is arranged at the top of the pile core 2, the hydrogen collecting pipeline 11 is connected with a hydrogen compression device 10 on the ground, and hydrogen generated in the pile core 2 is compressed and bottled;

and 5: after the electric corrosion work is finished, the power supply 13 is turned off, and the electrolyte conditioning liquid in the pile core 2 is recovered;

The pile core 2 is cylindrical or cubic and is made of steel materials. The circulation pump 5 is placed at the bottom of the pile core 2, and the circulation pump 5 is generally made of stainless steel or plastic because the pile core 2 has a high concentration of electrolyte solution and a large current is present. In addition, the power supply 13 is a plurality of high-capacity direct-current power supplies, and in order to ensure that the electric corrosion achieves an ideal effect, the capacity of each direct-current power supply is usually 1000-6000A.

Preferably, the insulating layer 4 is welded to the core 2 in step 1.

2Fe+6H₂O→2Fe(OH)₃↓+3H₂↑ (1)。

preferably, before the electric corrosion process in the step 2 is carried out, in order to prevent the soil body from collapsing possibly in the electric corrosion process, the shield machine is firstly jacked in and is tightly attached to the retaining wall 1.

The electrolyte regulating solution may be various soluble salt substances such as NaCl.

Alternatively, the electrolyte regulating solution comprises metal ions and metal anions, wherein the metal cations comprise any one or two of sodium ions and potassium ions, and the anions comprise any one or more of chloride ions, acetate ions and sulfate ions.

In addition, the cathode copper bar 14 may be in direct contact with the pile core 2, so that the power supply equipment is damaged due to the surge of the electric erosion current. For this purpose, the power supply device is provided with an overload protection device, which may be a fuse.

Example 2

Example 2 differs from example 1 in that: and an insulating ring is added on the copper bar to avoid collision.

Specifically, the construction method for directly starting and arriving the shield by using the electric erosion pile core comprises the following steps:

In the step 2, a plurality of insulating rings are sleeved on the copper bar 14, and when collision occurs, the insulating rings are firstly contacted with the pile core 2, so that the influence on the conductivity of the copper bar 14 is avoided.

Example 3

Example 3 differs from example 1 in that: the air compressor is additionally arranged to ventilate the bottom of the pile core, so that the circulation of the electrolyte solution is accelerated.

In the step 3, in the process of extracting the electrolyte conditioning liquid mixed with the iron hydroxide in the pile core 2 by the circulating pump 5, the air is introduced to the bottom of the pile core 2 by the air compressor on the ground, so that the circulation of the electrolyte solution is accelerated, and the precipitate iron hydroxide is rolled, so that the electrolyte conditioning liquid mixed with the iron hydroxide is conveniently extracted by the circulating pump 5.

Example 4

Example 4 differs from example 1 in that: the distance between the copper bar and the pile core is dynamically adjusted through a distance adjusting formula, and the electrolytic corrosion process is promoted to be carried out more uniformly and effectively.

In order to uniformly perform the electrolytic corrosion process, a distance adjusting formula is adopted to dynamically adjust the distance between the copper bar and the pile core in the electrolytic corrosion process.

Wherein, the distance adjustment formula is as follows:

wherein, the delta Vi represents the voltage change between the copper bar and the pile core in the ith pile core in the delta t time period,

here, the copper bar 14 links to each other with insulating straight-bar, and the straight-bar leads to ground, and the top of straight-bar is fixed to be equipped with the horizontal pole, and the horizontal pole can set up in the draw-in groove, has the unanimous bayonet socket of a plurality of opening directions on the draw-in groove, can be through the distance between horizontal pole and the joint control copper bar 14 of draw-in groove and the stake core 2.

In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.

Those skilled in the art will appreciate that the modules or units or groups of devices in the examples disclosed herein may be arranged in a device as described in this embodiment, or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into multiple sub-modules.

Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. Modules or units or groups in embodiments may be combined into one module or unit or group and may furthermore be divided into sub-modules or sub-units or sub-groups. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Furthermore, some of the described embodiments are described herein as a method or combination of method elements that can be performed by a processor of a computer system or by other means of performing the described functions. A processor having the necessary instructions for carrying out the method or method elements thus forms a means for carrying out the method or method elements. Further, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is used to implement the functions performed by the elements for the purpose of carrying out the invention.

As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.

Claims

1. A method for directly starting and arriving a shield by using an electric erosion pile core is characterized by comprising the following steps:

step 1: the method comprises the following steps that a plurality of pile cores (2) in the vertical direction are arranged on a retaining wall (1), the pile cores (2) are hollow, an upper insulating layer and a lower insulating layer (4) are arranged on the pile cores (2), the upper insulating layer and the lower insulating layer (4) separate the pile cores (2) into three parts which are not in contact with each other, and the upper insulating layer and the lower insulating layer (4) are respectively positioned above and below a region (3) to be dissolved, through which a shield machine passes;

step 2: the pile core (2) between the upper insulating layer and the lower insulating layer (4) is connected with the anode of a power supply (13) arranged on the ground through a cable (12), a copper bar (14) is arranged in the pile core (2), the copper bar (14) is connected with the cathode of the power supply (13) through the cable (12), the power supply (13) is switched on, the pile core (2) is electroeroded, and precipitates, namely ferric hydroxide and hydrogen are generated in the electroerosion process;

and step 3: a circulating pump (5) is placed at the bottom of each pile core (2), after the circulating pump (5) extracts electrolyte conditioning liquid mixed with ferric hydroxide in the pile core (2), the electrolyte conditioning liquid mixed with the ferric hydroxide is separated from ferric hydroxide by a ground ferric hydroxide separation station (7) through a circulating pipeline (6) and then enters an electrolyte conditioning pool (8), the electrolyte conditioning liquid in the electrolyte conditioning pool (8) extends into the pile core (2) through an overflow pipeline (9), and the electrolyte conditioning liquid is recycled;

and 4, step 4: a hydrogen collecting pipeline (11) is arranged at the top of the pile core (2), the hydrogen collecting pipeline (11) is connected with a hydrogen compression device (10) on the ground, and hydrogen generated in the pile core (2) is compressed and bottled;

and 5: after the electric corrosion work is finished, the power supply (13) is turned off, and electrolyte adjusting liquid in the pile core (2) is recycled;

2. A method of constructing an electrolytic pile core for direct shield launch and arrival according to claim 1, characterized in that the pile core (2) is in the shape of a cylinder or a cube.

3. A method for direct shield launch and arrival according to claim 1, characterized by the fact that in step 1 the insulation layer (4) is fused to the core (2).

4. The method for directly starting and arriving the shield by using the electric erosion pile core according to claim 1, wherein the electrochemical formula of the electric erosion in the step 2 is as follows:

2Fe+6H₂O→2Fe(OH)₃↓+3H₂↑ (1)。

5. the method of claim I, wherein the pile core is used for direct shield launching and arrival,

in order to prevent the soil body from collapsing possibly in the electric erosion process before the electric erosion process in the step 2, the shield machine is firstly jacked in and is tightly attached to the retaining wall (1).

6. The method for directly starting and arriving the shield by the electrolytic pile core according to claim 1, characterized in that the copper bar (14) is sleeved with a plurality of insulating rings in step 2, and the insulating rings are firstly contacted with the pile core (2) in case of collision, so as to avoid the influence on the conductivity of the copper bar (14).

7. The method for directly starting and arriving the shield of the electrolytic pile core of claim 1, wherein in step 3, during the process of pumping the electrolyte conditioning solution mixed with ferric hydroxide in the pile core (2) by the circulating pump (5), the bottom of the pile core (2) is aerated by an air compressor on the ground, the circulation of the electrolyte solution is accelerated, and the precipitated ferric hydroxide is tumbled, so that the electrolyte conditioning solution mixed with ferric hydroxide is pumped by the circulating pump (5).

8. The method for directly starting and arriving the shield by using the electric erosion pile core according to claim 1, wherein the electrolyte regulating solution comprises metal ions and metal anions, the metal cations comprise any one or two of sodium ions and potassium ions, and the anions comprise any one or more of chloride ions, acetate ions and sulfate ions.

9. The method for directly starting and arriving a shield by using an electrolytic corrosion pile core as claimed in claim 1, wherein a distance adjustment formula is used to dynamically adjust the distance between the copper rod and the pile core during the electrolytic corrosion process in order to make the electrolytic corrosion process uniformly.

10. The method for directly starting and arriving the shield by using the electric erosion pile core according to claim 1, wherein the distance adjustment formula is as follows: