阅读说明：本技术 一种深井压力注浆工艺 (Deep well pressure grouting process ) 是由 贾磊 刘刚 蔡汉生 胡上茂 张义 施健 廖民传 胡泰山 屈路 梅琪 刘浩 冯瑞 于 2020-03-05 设计创作，主要内容包括：本发明公开一种深井压力注浆工艺,该工艺包括步骤：对施工场地的土壤电阻率进行测量成像；确定接地深井的定点位置,进行接地深井钻孔；成孔后,进行深井接地极安装；用注浆机将搅拌好的煅烧石油焦炭注入接地深井,直至井口溢出煅烧石油焦炭；对注浆后的土壤电阻率进行测量成像和对单井接地电阻进行测量,得到第一测量结果；若符合验收规范,进行接地深井的井口封堵；用注浆机将搅拌好的煅烧石油焦炭进行压力注浆,直至注浆机的压力表的压力达到预设压力值；对压力注浆后的土壤电阻率进行测量成像和对单井接地电阻进行测量,得到第二测量结果；若符合验收规范,对接地深井进行焊接防腐。本发明能适用于各种复杂地质环境下的压力注浆。(The invention discloses a deep well pressure grouting process, which comprises the following steps: measuring and imaging the soil resistivity of the construction site; determining the fixed point position of the grounding deep well, and drilling the grounding deep well; after the hole is formed, mounting a deep well grounding electrode; injecting the stirred calcined petroleum coke into the grounded deep well by using a grouting machine until the calcined petroleum coke overflows from a well mouth; measuring and imaging the resistivity of the soil after grouting and measuring the single-well grounding resistance to obtain a first measurement result; if the ground deep well meets the acceptance standard, plugging the well mouth of the ground deep well; performing pressure grouting on the stirred calcined petroleum coke by using a grouting machine until the pressure of a pressure gauge of the grouting machine reaches a preset pressure value; measuring and imaging the resistivity of the soil subjected to pressure grouting and measuring the single-well grounding resistance to obtain a second measurement result; and if the standard meets the acceptance standard, performing welding corrosion prevention on the ground deep well. The invention can be suitable for pressure grouting in various complex geological environments.)

1. The deep well pressure grouting process is characterized by comprising the following steps of:

before construction, measuring and imaging the soil resistivity of a construction site;

determining the fixed point position of the grounding deep well, and drilling the grounding deep well;

after the hole is formed, mounting a deep well grounding electrode;

injecting the stirred calcined petroleum coke into the grounding deep well by using a grouting machine until the calcined petroleum coke overflows from the well mouth of the grounding deep well;

measuring and imaging the resistivity of the soil after grouting and measuring the single-well grounding resistance to obtain a first measurement result;

if the first measurement result meets the acceptance criterion, plugging the well mouth of the grounding deep well;

performing pressure grouting on the stirred calcined petroleum coke by using the grouting machine until the pressure of a pressure gauge of the grouting machine reaches a preset pressure value;

measuring and imaging the resistivity of the soil subjected to pressure grouting and measuring the single-well grounding resistance to obtain a second measurement result;

and if the second measurement result meets the acceptance criterion, performing welding corrosion prevention on the grounding deep well.

2. The deep well pressure grouting process of claim 1, wherein the measuring and imaging of the soil resistivity specifically comprises:

determining the measuring direction and the position of the grounding deep well, installing an electrode, and arranging a measuring lead and connecting the electrode;

installing a high-density electrical method measuring system, and establishing connection between high-density software and the high-density electrical method measuring system;

and carrying out self-checking, starting measurement after the requirement is met, outputting measurement data, and generating a contour map in the high-density software.

3. The deep well pressure grouting process according to claim 1, wherein the measuring of the single well ground resistance specifically comprises:

and paying off according to the test standard, putting down the measuring electrode into the single well, switching on a power supply, and testing by using a grounding impedance tester.

4. The deep well pressure grouting process according to claim 1, wherein the determining of the fixed point position of the grounded deep well and the drilling of the grounded deep well comprise:

determining the fixed point position of the grounding deep well, performing measurement and setting-out,

drilling by using a geological prospecting drilling machine, and simultaneously, matching a grouting machine with slurry to protect a wall;

and (6) performing hole forming acceptance inspection.

5. The deep well pressure grouting process according to claim 1, wherein the deep well grounding electrode installation specifically comprises:

hoisting a hot-dip galvanized steel pipe subjected to straightening processing and corrosion prevention treatment by using a drilling machine, and placing the hot-dip galvanized steel pipe into the grounding deep well;

when one end of the hot-dip galvanized steel pipe is placed in one meter, clamping the hot-dip galvanized steel pipe by using a special clamp, sleeving a connecting pipe on a thread at the other end of the hot-dip galvanized steel pipe, and screwing the connecting pipe by using a pipe wrench;

and butting the other hot-dip galvanized steel pipe with the connecting pipe, screwing the hot-dip galvanized steel pipe by using the pipe tongs, and continuously sinking the hot-dip galvanized steel pipe until the hot-dip galvanized steel pipe reaches the specified depth.

6. The deep well pressure grouting process according to claim 1, wherein the injecting the stirred calcined petroleum coke into the grounded deep well by a grouting machine specifically comprises:

fully stirring and mixing the calcined petroleum coke and water in a stirring barrel according to the proportion of the design requirement;

connecting and screwing a conduit of the grouting machine with the exposed part of the grounding electrode by using a connecting pipe;

and injecting the stirred calcined petroleum coke into the grounding deep well.

7. The deep well pressure grouting process according to claim 1, wherein the plugging of the wellhead of the grounded deep well specifically comprises:

cleaning and flattening the periphery of the well mouth of the grounding deep well, and plugging the well mouth with waste materials;

erecting a formwork around the wellhead, and then pouring concrete, wherein the size of the formwork is 0.4m × 0.4m × 0.05 m;

and (5) collecting the surface, and removing the mold after the concrete is fully solidified.

8. The deep well pressure grouting process according to claim 1, wherein the preset pressure value is 8-10 MPa.

9. The deep well pressure grouting process according to claim 1, wherein the welding corrosion prevention of the grounded deep well specifically comprises:

digging a groove by using a digging machine so as to expose the horizontal grounding body and the grounding electrode;

carrying out electric welding on the horizontal grounding body and the grounding electrode;

after welding, cleaning welding slag at a welding opening, and brushing asphalt anti-corrosion paint for corrosion prevention;

and backfilling by using original soil, and tamping in layers.

Technical Field

The invention relates to the technical field of deep well grouting construction, in particular to a deep well pressure grouting process.

Background

Disclosure of Invention

The embodiment of the invention aims to provide a deep well pressure grouting process which has good grouting effect, can be suitable for pressure grouting in various complex geological environments and has guiding significance on resistance reduction construction of a ground engineering.

In order to achieve the above object, an embodiment of the present invention provides a deep well pressure grouting process, including the following steps:

before construction, measuring and imaging the soil resistivity of a construction site;

determining the fixed point position of the grounding deep well, and drilling the grounding deep well;

after the hole is formed, mounting a deep well grounding electrode;

injecting the stirred calcined petroleum coke into the grounding deep well by using a grouting machine until the calcined petroleum coke overflows from the well mouth of the grounding deep well;

measuring and imaging the resistivity of the soil after grouting and measuring the single-well grounding resistance to obtain a first measurement result;

if the first measurement result meets the acceptance criterion, plugging the well mouth of the grounding deep well;

performing pressure grouting on the stirred calcined petroleum coke by using the grouting machine until the pressure of a pressure gauge of the grouting machine reaches a preset pressure value;

measuring and imaging the resistivity of the soil subjected to pressure grouting and measuring the single-well grounding resistance to obtain a second measurement result;

and if the second measurement result meets the acceptance criterion, performing welding corrosion prevention on the grounding deep well.

Preferably, the measuring and imaging of the soil resistivity specifically includes:

determining the measuring direction and the position of the grounding deep well, installing an electrode, and arranging a measuring lead and connecting the electrode;

installing a high-density electrical method measuring system, and establishing connection between high-density software and the high-density electrical method measuring system;

and carrying out self-checking, starting measurement after the requirement is met, outputting measurement data, and generating a contour map in the high-density software.

Preferably, the measuring of the single-well ground resistance specifically includes:

and paying off according to the test standard, putting down the measuring electrode into the single well, switching on a power supply, and testing by using a grounding impedance tester.

Preferably, the determining the fixed point position of the grounded deep well and drilling the grounded deep well specifically comprise:

determining the fixed point position of the grounding deep well, performing measurement and setting-out,

drilling by using a geological prospecting drilling machine, and simultaneously, matching a grouting machine with slurry to protect a wall;

and (6) performing hole forming acceptance inspection.

Preferably, the deep well grounding electrode installation specifically includes:

hoisting a hot-dip galvanized steel pipe subjected to straightening processing and corrosion prevention treatment by using a drilling machine, and placing the hot-dip galvanized steel pipe into the grounding deep well;

when one end of the hot-dip galvanized steel pipe is placed in one meter, clamping the hot-dip galvanized steel pipe by using a special clamp, sleeving a connecting pipe on a thread at the other end of the hot-dip galvanized steel pipe, and screwing the connecting pipe by using a pipe wrench;

and butting the other hot-dip galvanized steel pipe with the connecting pipe, screwing the hot-dip galvanized steel pipe by using the pipe tongs, and continuously sinking the hot-dip galvanized steel pipe until the hot-dip galvanized steel pipe reaches the specified depth.

Preferably, the injecting the stirred calcined petroleum coke into the grounded deep well by using a grouting machine specifically comprises:

fully stirring and mixing the calcined petroleum coke and water in a stirring barrel according to the proportion of the design requirement;

connecting and screwing a conduit of the grouting machine with the exposed part of the grounding electrode by using a connecting pipe;

and injecting the stirred calcined petroleum coke into the grounding deep well.

Preferably, the performing of wellhead plugging of the grounded deep well specifically comprises:

cleaning and flattening the periphery of the well mouth of the grounding deep well, and plugging the well mouth with waste materials;

erecting a formwork around the wellhead, and then pouring concrete, wherein the size of the formwork is 0.4m × 0.4m × 0.05 m;

and (5) collecting the surface, and removing the mold after the concrete is fully solidified.

Preferably, the preset pressure value is 8-10 MPa.

Preferably, the welding corrosion prevention of the grounding deep well specifically comprises:

digging a groove by using a digging machine so as to expose the horizontal grounding body and the grounding electrode;

carrying out electric welding on the horizontal grounding body and the grounding electrode;

after welding, cleaning welding slag at a welding opening, and brushing asphalt anti-corrosion paint for corrosion prevention;

backfilling with original soil, and ramming in layers

Compared with the prior art, the deep well pressure grouting process provided by the embodiment of the invention has the advantages that the grouting-pressure grouting process is carried out by superposition, and soil resistivity measurement imaging and ground resistance measurement are carried out after each grouting, so that each construction process is qualified, the deep well pressure grouting effect is better, the process is suitable for various complex geological environments, and the construction effect is good.

Drawings

Fig. 1 is a schematic flow chart of a deep well pressure grouting process according to an embodiment of the present invention;

fig. 2 is a simplified flow diagram of a deep well pressure grouting process according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, which is a schematic flow chart of a deep well pressure grouting process according to an embodiment of the present invention, the method includes steps S1 to S9:

s1, before construction, measuring and imaging the soil resistivity of the construction site;

s2, determining the fixed point position of the grounding deep well, and drilling the grounding deep well;

s3, after hole forming, deep well grounding electrode installation is carried out;

s4, injecting the stirred calcined petroleum coke into the grounded deep well by using a grouting machine until the calcined petroleum coke overflows from the well mouth of the grounded deep well;

s5, measuring and imaging the resistivity of the soil after grouting and measuring the single-well grounding resistance to obtain a first measurement result;

s6, if the first measurement result meets the acceptance criterion, plugging the well mouth of the grounding deep well;

s7, performing pressure grouting on the stirred calcined petroleum coke by using the grouting machine until the pressure of a pressure gauge of the grouting machine reaches a preset pressure value;

s8, measuring and imaging the resistivity of the soil subjected to pressure grouting and measuring the single-well grounding resistance to obtain a second measurement result;

and S9, if the second measurement result meets the acceptance criterion, performing welding corrosion prevention on the grounding deep well.

In order to more intuitively understand the process of the present invention, the embodiment of the present invention further provides a simplified process schematic diagram of the deep well pressure grouting process, specifically referring to fig. 2. As can be seen from fig. 2, before the process is performed, a preliminary preparation is also performed, for example: (1) preparing tools and instruments, reasonably arranging the tools and instruments used in construction according to the actual situation of the site and by combining the characteristics of the process; (2) and (4) positioning and paying off the deep well, and positioning the position of the deep well strictly according to a drawing. The deep well position is selected to meet the design specification requirement and have operability according to the actual situation of the site; (3) and (4) entering a mechanical device, and after the device enters the field, checking the performance of the device by a specific operator. The safe operation of mechanical equipment in construction is ensured; (4) and (4) entering a material yard, and placing the material in order in a specified storage yard after entering the material yard, so as to well perform the dust-proof, moisture-proof and anti-theft work of the material. The site selection of the material yard cannot influence the construction, and the material yard must be provided with a marking label; (5) the special power supply arrangement and the special distribution box are provided with 220V and 380V power interfaces. The distribution box wiring should be neat, standard, reliably grounded, and have safety fences and obvious warning signs.

After the preparation work in the early stage is completed, the following process flow is started, specifically,

before construction, measuring and imaging the resistivity of the soil of the construction site to know the geological condition of the construction site.

And determining the fixed point position of the grounding deep well, drilling the grounding deep well, and installing a deep well grounding electrode after forming a hole, wherein the process corresponds to a drilling process.

And (3) injecting the stirred calcined petroleum coke into the grounded deep well by using a grouting machine until the calcined petroleum coke overflows from the well mouth of the grounded deep well, wherein the grouting process corresponds to the process.

Measuring and imaging the resistivity of the soil after grouting and measuring the single-well grounding resistance to obtain a first measurement result; the measurement is carried out to know the change of soil resistance after grouting so as to better carry out subsequent construction.

And if the first measurement result meets the acceptance specification, plugging the well mouth of the grounded deep well, which is to ensure that the process before plugging meets the requirements and is qualified. The acceptance standard can refer to the construction and acceptance standard of the grounding device in the electrical device installation engineering of GB 50169-2006.

And after the well mouth is plugged, performing pressure grouting again, specifically performing pressure grouting on the stirred calcined petroleum coke by using a grouting machine until the pressure of a pressure gauge of the grouting machine reaches a preset pressure value.

Measuring and imaging the resistivity of the soil subjected to pressure grouting and measuring the single-well grounding resistance to obtain a second measurement result; the measurement here is to know whether the soil resistance after pressure grouting has met the construction requirements so that an acceptance work can be prepared.

And if the second measurement result meets the acceptance criterion, performing welding corrosion prevention on the ground deep well. The welding corrosion prevention is to prevent the grounding deep well from being corroded by the natural environment and aging as much as possible. Likewise, the acceptance specifications may refer to the construction and acceptance specifications for grounding devices for electrical device installation engineering of GB 50169-2006.

According to the deep well pressure grouting process provided by the embodiment 1 of the invention, the grouting-pressure grouting process is carried out by superposition, and soil resistivity measurement imaging and grounding resistance measurement are carried out after each grouting, so that each construction process is qualified, the deep well pressure grouting effect is good, and the process is suitable for various complex geological environments and has good construction effect.

As an improvement of the above scheme, the measuring and imaging of the soil resistivity specifically includes:

determining the measuring direction and the position of the grounding deep well, installing an electrode, and arranging a measuring lead and connecting the electrode;

installing a high-density electrical method measuring system, and establishing connection between high-density software and the high-density electrical method measuring system;

and carrying out self-checking, starting measurement after the requirement is met, outputting measurement data, and generating a contour map in the high-density software.

Specifically, the measuring direction and the position of the grounding deep well are determined, and the testing direction must be strictly in the same direction from the beginning to the end of the project. And installing electrodes, arranging a measuring lead and connecting the electrodes, wherein the electrodes are connected with the measuring lead by paying attention to the direction of the opening and the large and small openings correspond to each other.

Installing a high-density electrical method measuring system, and establishing connection between high-density software and the high-density electrical method measuring system; the connection is via a bluetooth connection; and carrying out self-checking, starting measurement after the requirement is met, outputting measurement data, and generating a contour map in high-density software. If the grounding resistance measured by self-checking is larger than a set value, whether the connecting line between the electrode and the host is broken or not and whether the electrode is inserted in a missing way or not should be checked.

In addition, an electrode corresponding to the position of the grounded deep well is recorded during measurement, and the change of a contour line of the electrode position corresponding to the position of the deep well is observed after a contour map is generated; the measuring direction, i.e. the direction of the running pole, should be consistent from the beginning to the end of the project, and is strictly forbidden.

Preferably, the high-density electrical measurement system is a WDJD-4 high-density electrical measurement system, and the high-density software is surfer software.

It should be noted that, in the present invention, the three times of measurement imaging for soil resistivity are the same, and only the obtained measurement results are different, so that the measurement imaging for each time is not repeated.

As an improvement of the above scheme, the measuring of the single-well ground resistance specifically includes:

and paying off according to the test standard, putting down the measuring electrode into the single well, switching on a power supply, and testing by using a grounding impedance tester.

Specifically, according to the test standard, setting out, drilling down a single well with the measuring electrode, switching on the power supply, and testing by using the grounding impedance tester.

It should be noted that (1) the test loop should avoid rivers and lakes as much as possible; the device is far away from underground metal pipelines and running power transmission lines as far as possible; attention is paid to reducing the mutual inductance influence between the current lines and the potential lines; (2) if the liquid crystal screen of the grounding impedance tester displays that the testing current is small, whether the wiring is firm or not is checked, and resistance reduction in a mode that a plurality of current poles are connected in parallel or water is splashed to the periphery of the current poles can be tried; (3) if the liquid crystal display screen displays that the grounding resistance of the potential electrode is larger or the voltage wire is broken, the voltage input wire is checked whether the wire is broken or not, and the grounding resistance can be reduced by deepening the grounding pile of the potential electrode or pouring salt water around the grounding pile.

As an improvement of the above scheme, the determining the fixed point position of the grounded deep well and drilling the grounded deep well specifically includes:

determining the fixed point position of the grounding deep well, performing measurement and setting-out,

drilling by using a geological prospecting drilling machine, and simultaneously, matching a grouting machine with slurry to protect a wall;

and (6) performing hole forming acceptance inspection.

Specifically, the fixed point position of the grounding deep well is determined, and measurement setting is carried out so as to avoid collision with the engineering pile and influence on supporting construction.

Drilling by using a geological prospecting drilling machine, and simultaneously, matching a grouting machine with slurry to protect a wall; preferably, the prospecting drill is an XY-100 type prospecting drill, and the drill bit adopts a 110mm hole which can be adjusted according to the design requirement. The grouting machine is matched with the mud retaining wall to prevent the well wall from collapsing.

And (6) performing hole forming acceptance inspection. After the hole is formed, the diameter of the hole is measured by using a 5M measuring tape, and the depth of the hole is based on the depth of the drill rod. The depth of the hole is larger than the designed value, which is to facilitate the installation of the grounding electrode, and the hole depth needs a certain margin. The allowable value of the verticality error of the formed hole is within 1 percent.

As an improvement of the above scheme, the installation of the deep well grounding electrode specifically includes:

hoisting a hot-dip galvanized steel pipe subjected to straightening processing and corrosion prevention treatment by using a drilling machine, and placing the hot-dip galvanized steel pipe into the grounding deep well;

when one end of the hot-dip galvanized steel pipe is placed in one meter, clamping the hot-dip galvanized steel pipe by using a special clamp, sleeving a connecting pipe on a thread at the other end of the hot-dip galvanized steel pipe, and screwing the connecting pipe by using a pipe wrench;

and butting the other hot-dip galvanized steel pipe with the connecting pipe, screwing the hot-dip galvanized steel pipe by using the pipe tongs, and continuously sinking the hot-dip galvanized steel pipe until the hot-dip galvanized steel pipe reaches the specified depth.

In this example, a galvanized steel pipe was used as the ground electrode. The machining refers to opening holes and turning threads, specifically, the holes are opened at positions on the grounding electrode every 2 meters by using electric welding, and the positions of the openings are subjected to anti-corrosion treatment. And performing anticorrosive treatment on the threads at the two ends of each grounding electrode.

Specifically, a hot-dip galvanized steel pipe which is subjected to straightening processing and corrosion prevention treatment is hoisted by a drilling machine and is placed into a grounded deep well; wherein, the ligature of lifting rope and hot-dip galvanized steel pipe of rig must be firm, prevents to drop.

When the hot-dip galvanized steel pipe is installed, when one end of the hot-dip galvanized steel pipe is put in one meter, namely, when the hot-dip galvanized steel pipe is put down one meter away from the top of the hot-dip galvanized steel pipe, the hot-dip galvanized steel pipe is clamped by a special clamp, a connecting pipe is sleeved at the thread at the other end of the hot-dip galvanized steel pipe, and the connecting pipe is screwed by a pipe wrench; the other end of the hot-dip galvanized steel pipe refers to an end of the hot-dip galvanized steel pipe.

And butting the other hot-dip galvanized steel pipe with the connecting pipe, screwing the hot-dip galvanized steel pipe by using a pipe wrench, and continuously sinking the hot-dip galvanized steel pipe until the hot-dip galvanized steel pipe reaches the specified depth. After the deep well grounding electrode is installed, the hot dip galvanized steel pipe is exposed to the ground by 100mm, so that subsequent grouting is facilitated.

It is worth noting that the diameter of the opening of the hot-dip galvanized steel pipe is less than or equal to 10 mm; straightening a hot-dip galvanized steel pipe with large camber; a certain margin is reserved when each grounding electrode is installed so as to be convenient for connecting the next grounding electrode by clamping the clamping apparatus; when the clamp is clamped, the chute is prevented; the two grounding electrodes are connected by a connecting pipe, and a pipe wrench is required to be screwed during connection.

As an improvement of the above scheme, the injecting the stirred calcined petroleum coke into the grounded deep well by using a slurry injector specifically comprises:

fully stirring and mixing the calcined petroleum coke and water in a stirring barrel according to the proportion of the design requirement;

connecting and screwing a conduit of the grouting machine with the exposed part of the grounding electrode by using a connecting pipe;

and injecting the stirred calcined petroleum coke into the grounding deep well.

Specifically, the calcined petroleum coke and water are fully stirred and mixed in a stirring barrel according to the proportion of the design requirement; typically, the calcined petroleum coke is mixed with water in a ratio of 3: 1. In addition, the calcined petroleum coke requires attention to dust emission during handling and stirring.

The conduit of the slip casting machine is connected to the exposed portion of the ground electrode by a connecting pipe and is screwed, which prevents the calcined petroleum coke from flowing to other places and causing waste.

And injecting the stirred calcined petroleum coke into the grounded deep well until the calcined petroleum coke overflows from the well mouth, wherein the overflow amount of the petroleum coke at the well mouth of the grounded deep well is required to be controllable.

As an improvement of the above scheme, the plugging of the wellhead of the grounded deep well specifically comprises:

cleaning and flattening the periphery of the well mouth of the grounding deep well, and plugging the well mouth with waste materials;

erecting a formwork around the wellhead, and then pouring concrete, wherein the size of the formwork is 0.4m × 0.4m × 0.05 m;

and (5) collecting the surface, and removing the mold after the concrete is fully solidified.

Specifically, the periphery of the well mouth of the grounding deep well is cleaned and leveled, and the well mouth is plugged by waste materials. Typically, woven bags are stuffed to-0.5 m.

And (3) erecting a formwork around the wellhead, and then pouring concrete, wherein the size of the formwork is 0.4m × 0.4m × 0.05 m.

And (4) closing the surface, and removing the mold after the concrete is fully solidified to prevent well blowout. The mold stripping time is determined according to the local air temperature.

As an improvement of the scheme, the preset pressure value is 8-10 MPa.

Specifically, the preset pressure value is 8-10MPa, namely, when pressure grouting is carried out, the pressure grouting machine stops when a pressure gauge on the grouting machine reaches 8-10 MPa.

As an improvement of the above scheme, the welding corrosion prevention of the grounded deep well specifically comprises:

digging a groove by using a digging machine so as to expose the horizontal grounding body and the grounding electrode;

carrying out electric welding on the horizontal grounding body and the grounding electrode;

after welding, cleaning welding slag at a welding opening, and brushing asphalt anti-corrosion paint for corrosion prevention;

and backfilling by using original soil, and tamping in layers.

Specifically, a trench is dug by using a digging machine so as to expose a horizontal grounding body and a grounding electrode; during the excavation process, the position of the underground pipeline needs to be taken into consideration to prevent damage.

And carrying out electric welding on the horizontal grounding body and the grounding electrode. Generally, the ground electrode is first welded to the ohmic card and then welded to the horizontal ground body. The grounding body is connected and should be welded by electric welding, the welding should adopt overlap joint welding, and its overlap joint length must accord with: the width of the flat steel is 2 times of that of the flat steel, and at least 3 edges are welded; the diameter of the round steel is 6 times of that of the round steel; when the round steel flat steel is welded, the length of the round steel flat steel is 6 times of the diameter of the round steel.

And after welding, cleaning welding slag at a welding opening, and brushing asphalt anti-corrosion paint for corrosion prevention. Before the anticorrosion treatment, the surface must be descaled and the welding slag remaining at the welding site must be removed.

And backfilling by using original soil, and tamping in layers. The backfill soil can not contain stone concrete garbage and the like.

In summary, the deep well pressure grouting process provided by the embodiment of the invention has the advantages that the grouting-pressure grouting process is carried out by superposition, and soil resistivity measurement imaging and ground resistance measurement are carried out after each grouting, so that each construction process is qualified, the deep well pressure grouting effect is good, the process is suitable for various complex geological environments, and the construction effect is good.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.