CN110409422B - Diaphragm wall construction method and diaphragm wall construction system - Google Patents

Abstract

The invention discloses a construction method and a construction system of a diaphragm wall, wherein the construction method of the diaphragm wall comprises the following steps: s1) construction preparation; s2) grooving construction; s3) adding new slurry into the tank in the step S2), or adding new slurry and recovered slurry after purification treatment; s4) hoisting a reinforcement cage into the finished groove supplemented with the slurry; s5) carrying out bottom sediment treatment on the formed groove in the step S4) to finish secondary hole cleaning; s6) pouring concrete into the grooves formed in the step S5); s7) recycling the slurry overflowing from the grooving while the step S6) is performed; s8) finishing the pouring of the diaphragm wall. The diaphragm wall construction system comprises a new slurry preparation device, a slurry containing structure, a hydraulic milling grooving machine, a slurry purification device, a slurry cleaning pump, a circulating slurry mixing pool, a slurry pump, a crane, a guide pipe, an air pipe and a compressor. The technical scheme of the invention achieves the effect of convenient detection of the viscosity of the recovered slurry.

Description

Diaphragm wall construction method and diaphragm wall construction system

Technical Field

The invention relates to the technical field of diaphragm wall construction, in particular to a diaphragm wall construction method and a diaphragm wall construction system.

Background

The underground continuous wall (diaphragm wall panel tree trench) is a remote foundation engineering, and is characterized by that on the ground a trench-digging machine is adopted, along the peripheral axis of the deep-digging engineering, under the condition of slurry wall-protecting, a long and narrow deep trench is dug, after the trench is cleaned, a reinforcing bar cage is hung in the trench, then the underwater concrete is poured by means of conduit method to form a unit trench section, and according to the above-mentioned steps the concrete is poured section by section, and a continuous reinforced concrete wall is built underground to form the structure for intercepting water, resisting seepage, bearing and retaining water. The method is characterized in that: the construction vibration is small, the wall rigidity is large, the integrity is good, the construction speed is high, the earth and stone space can be saved, the method can be used for constructing deep foundation pit support in dense building groups and carrying out reverse construction, and the method can be used for construction in various geological conditions including sandy soil layers and gravel layers with the particle size of less than 50 mm. The method is suitable for building basements, underground shopping malls, parking lots, underground oil depots, retaining walls, deep foundations of high-rise buildings, reverse construction building enclosures and deep ponds and pits of industrial buildings; a shaft, etc.

However, in the current diaphragm wall construction, after the reinforcement cage is hung, if the groove ground sediment exists, the reinforcement cage is difficult to take out. Most importantly, after the step of pouring concrete on the underground diaphragm wall, the overflowed slurry is often collected and recycled for the next underground diaphragm wall construction. However, the viscosity of the slurry changes after multiple uses. Therefore, after the recovered slurry is extracted manually, the viscosity of the slurry is detected in a detection chamber. Thus, not only is the detection troublesome, but also the work efficiency is low.

Disclosure of Invention

The invention mainly aims to provide a construction method of a diaphragm wall, and aims to solve the problem that the viscosity of recovered slurry is inconvenient to detect.

In order to achieve the purpose, the invention provides a construction method of a diaphragm wall, which comprises the following steps:

s1) preparation of construction

S2) grooving construction; the grooving construction comprises the following steps:

a) digging a groove;

b) recycling and purifying the slurry generated by the grooving in the step a);

c) injecting new slurry into the groove to protect the wall while the step a) is carried out; or, while the step a) is carried out, injecting new slurry and the recovered slurry after the purification treatment into the tank for wall protection;

d) repeating steps a) to c) until the specification size of the tank meets the requirement;

e) performing sludge suction and hole cleaning on the interior of the groove to finish primary hole cleaning and form the groove;

s3) supplementing new slurry or supplementing new slurry and recovered slurry after purification treatment to the tank in the step e);

s4) hoisting a reinforcement cage into the finished groove supplemented with the slurry;

s5) carrying out bottom sediment treatment on the formed groove in the step S4) to finish secondary hole cleaning; wherein, adopt the gas lift method to handle the sediment, the gas lift method includes following step:

f) inserting a guide pipe and an air pipe into the bottom of the sinking groove;

g) conveying gas to the air pipe;

h) removing sediments at the bottom of the sink tank through the guide pipe;

i) repeating the step g) and the step h), and after the sediment at the bottom of the settling tank is removed and reaches the standard, extracting the sediment

The guide pipe and the air pipe;

s6) pouring concrete into the grooving after the step i);

s7) recycling the slurry overflowing from the grooving while the step S6) is performed;

s8) carrying out automatic viscosity detection on the recovered mud obtained in the step S7);

s9) carrying out corresponding modulation on the recovered mud according to the viscosity data detected in S8);

s10) repeating the steps S8) and S9) until the viscosity of the recovered mud reaches the required standard;

s11) finishing the pouring of the diaphragm wall.

Preferably, the step f) further comprises, during the insertion of the air duct, turning on a drill bit located at the output end of the air duct.

Preferably, the mud purification treatment in the step b) comprises the following steps:

b1) primary sand filtering, namely filtering particles with the diameter larger than 6mm in the recovered slurry;

b2) carrying out secondary sand filtration on the recovered slurry obtained in the step b1), and filtering particles with the diameter larger than 0.06mm in the slurry;

b3) putting the recovered slurry after the secondary sand filtration into a pool for precipitation for later use;

preferably, the step b3) is further followed by a step b4), and the step b4) is to carry out centrifugal treatment on the recycled slurry entering the pool to remove fine particles with the diameter of more than 0.03mm in the recycled slurry.

Preferably, the step S1) includes a new slurry mixing step, and the new slurry mixing step specifically includes the following steps:

j) adding water into the stirring barrel

k) Adding an additive into the stirring barrel, wherein the additive at least comprises bentonite powder and alkali powder;

l) stirring for at least 2min, adding CMC solution, and stirring for at least 1 min;

m) standing and expanding the stirred slurry for at least 24h to obtain new slurry.

The invention also provides a diaphragm wall construction system, which comprises:

a fresh slurry preparation device;

the slurry containing structure comprises a new slurry tank and a recovery tank, and the new slurry tank is used for storing new slurry generated by the new slurry preparation device;

a hydraulic groove milling and forming machine is used for grooving;

the mud purification device is used for purifying the recovered mud;

the slurry cleaning pump is used for conveying the slurry in the tank to a slurry purification device or a recovery tank;

the circulating slurry mixing tank is communicated with the slurry accommodating structure to receive new slurry; meanwhile, the circulating slurry mixing tank is also used for receiving the recovered slurry purified by the slurry purifying device;

the mud pump is used for conveying the mud in the circulating mud mixing tank into a groove dug by the hydraulic milling grooving machine;

the crane is used for hoisting the reinforcement cage;

the guide pipe is used for extending into the forming groove in which the reinforcement cage is placed and removing sediments at the bottom of the forming groove;

the air pipe is inserted into the guide pipe and extends towards the bottom of the guide pipe;

the compressor is used for conveying compressed gas to the air pipe;

the viscosity detection device is used for detecting the viscosity of the recovered slurry pumped to the recovery tank by the slurry cleaning pump;

the modulation material adding device comprises a new slurry cavity and a dispersing agent cavity; the new slurry cavity is communicated with the new slurry pool, and the dispersing agent cavity is filled with a dispersing agent; and outlets of the new pulp cavity and the dispersing agent cavity are communicated with a recovery tank, and a switch is arranged at the outlet.

Preferably, the output end of the air pipe is also provided with a drill bit, and a switch for controlling the drill bit is arranged at the input end of the air pipe.

Preferably, the mud purification device comprises a first sand remover and a second sand remover;

the slurry cleaning pump conveys the recycled slurry in the grooving to a first sand removing machine, the recycled slurry filtered by the first sand removing machine is conveyed to a second sand removing machine, and the recycled slurry filtered by the second sand removing machine is conveyed to a circulating slurry mixing pool.

Preferably, the mud purification device further comprises a centrifugal desanding device, and the centrifugal desanding device is used for removing fine particles of the mud in the circulating mixing tank.

Preferably, the new slurry preparation device comprises a stirring barrel, a stirrer extending into the stirring barrel, and a slurry outlet pump communicated with a slurry outlet of the stirring barrel.

The invention provides a construction method of a diaphragm wall, which adopts a mud purification device, thereby improving the use efficiency of mud. Meanwhile, after the reinforcement cage is hoisted, sediment in the groove is treated and discharged by adopting a gas lift method, so that the quality of the groove concrete pouring is improved. Wherein, the gas lift method can not only simply treat the sediments in the large-depth forming tank, but also achieve the effect of high treatment cleanliness. In addition, through the setting of mud viscosity detection device, can automated inspection retrieve the viscosity of mud, then cooperate the modulation material to add the device and carry out viscosity control to retrieving the mud, reach the performance of next circulation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic flow chart of the diaphragm wall construction method of the present invention;

FIG. 2 is a schematic view of the work flow of the diaphragm wall construction system of the present invention;

FIG. 3 is a schematic structural view of a part used for removing sediments by a gas lift method according to the present invention;

FIG. 3a is an enlarged view of a portion of the structure of FIG. 3;

FIG. 4 is a schematic cross-sectional view of a viscosity detecting device in the diaphragm wall construction system according to the present invention;

fig. 5 is a schematic view showing the operation flow of another embodiment of the ultra-deep pile diaphragm wall construction system in fig. 2.

The reference numbers illustrate:

the objects, features, and advantages of the present invention will be further described with reference to the accompanying drawings.

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.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a construction method of a diaphragm wall and a construction system of the diaphragm wall using the construction method of the diaphragm wall, and the construction method of the diaphragm wall is combined with the application of the construction system of the diaphragm wall to explain.

The invention provides a construction method of a diaphragm wall, which adopts a mud purification device, thereby improving the use efficiency of mud. Meanwhile, after the reinforcement cage is hoisted, sediment in the groove is treated and discharged by adopting a gas lift method, so that the quality of the groove concrete pouring is improved. Wherein, the gas lift method can not only simply treat the sediments in the large-depth forming tank, but also achieve the effect of high treatment cleanliness. The specific construction method is shown in fig. 1:

s1) preparation of construction

Before grooving construction, construction preparation is required, and the construction preparation content generally comprises mechanical positioning, preparation of new slurry, forming of a suspension cage and the like.

The preparation of the new slurry is described in detail, and the new slurry is prepared by the new slurry preparation apparatus. The novel slurry machine comprises a stirring barrel, a stirrer extending into the stirring barrel, and a slurry outlet pump communicated with a slurry outlet of the stirring barrel. During pulping, water is added to the mixer drum, preferably to the mixer drum 1/3, and then the mixer is started. And adding water into the quantitative water tank continuously, adding an additive into the stirring barrel, wherein the additive at least comprises bentonite powder and alkali powder, and stirring for at least 2 min. Subsequently, CMC solution was added and stirring was continued for at least 1 min. And standing and expanding the stirred slurry for at least 24 hours to obtain new slurry, and storing the new slurry in a slurry containing structure.

The concrete description is given to a slurry containing structure, the slurry containing structure comprises a new slurry pool and a recovery pool, the new slurry pool is used for storing new slurry generated by the new slurry preparation device, and the recovery pool is used for pouring slurry recovered from a groove in the concrete pouring step. And slurry circulating pipelines are arranged between the new slurry tank and the new slurry tank, between the recovery tank and between the new slurry tank and the recovery tank. Through the setting of circulating line, can avoid the static sediment of mud, improve the popped effect of thick liquid. And a gate valve is arranged between the pools, so that the single or grouped use can be realized, and the service performance is improved.

S2) grooving construction

The grooving construction generally comprises grooving, grouting, mud sucking and hole cleaning and the like. And for the grooving, a hydraulic groove milling and forming machine is adopted for excavating, and in the grooving process, a pump head arranged in a milling head pumps the slurry in the groove to a slurry purification device of a construction site. The mud purification device purifies the recovered mud and then conveys the purified mud to the circulating mud mixing pool, and particularly, the new mud expanded in the step S1) is also conveyed to the circulating mud mixing pool for standby. In the process of digging the groove, the wall protection slurry is required to be continuously conveyed into the groove, so the slurry (new slurry or purified slurry or the combination of the two) in the circulating slurry mixing tank is conveyed into the groove by a slurry pump to carry out wall protection.

And after the requirement is met to the specification and the size of the groove, the groove forming is realized, and then the mud is sucked and the hole is cleaned. Specifically, when the mud is sucked and cleaned, the mud in the groove is pumped out through a cleaning mud pump, conveyed to a mud purification device for purification, and then stored in a circulating slurry mixing pool for later use.

S3) adding new slurry into the finished tank after sludge suction and hole cleaning

And after mud is sucked and holes are cleaned, new slurry needs to be input into the finished groove for subsequent hoisting of the reinforcement cage. In the step, the supplemented new slurry is also conveyed to the tank by a slurry pump from the circulating slurry mixing tank.

S4) hoisting reinforcement cage

And after finishing the supplement of the grooving slurry, preparing to hoist the reinforcement cage. And hoisting the reinforcement cage by a crane, and then placing the reinforcement cage into a groove after supplementing the slurry.

S5) slag settling treatment

After the steel reinforcement cage is hoisted, the method is used for pouring the large and deep diaphragm wall. Therefore, the bottom of the tank is likely to have a lot of sediments, and especially sediments larger than 100mm are required to be removed. Therefore, the method adopts a gas lift method to treat the sediments. Referring specifically to FIG. 3, a conduit and an air hose are inserted into the bottom of the tank, the air hose is inside the conduit, and the air hose extends to about 50cm of the bottom of the conduit. After the guide pipe is inserted to reach the designated position, the communicated air pipe compressor is started to convey compressed air into the air pipe, and the air is discharged from the bottom end in the guide pipe. The discharged compressed gas and the slurry form a gas-liquid mixture, continuous bubbles rise upwards to cause a negative pressure at the bottom of the pipe, and the slurry continuously enters the pipe under the action of atmospheric pressure and rises to the orifice along with the bubbles. The sediment at the bottom of the tank is suspended under the impact of the sprayed gas, and due to the density difference of liquid inside and outside the pipe, the three-phase flow of slurry, air and sediment in the tank moves upwards along the guide pipe, is discharged out of the tank, is collected by the sediment collecting tank and then is transported outwards. And filtering sediments in the slurry, then re-entering the purified slurry into the tank, and repeatedly circulating until the thickness of sediments at the bottom of the tank meets the standard requirement.

S6) concrete pouring

And inserting the concrete pouring pipe into the bottom of the groove, conveying the concrete, and pouring from bottom to top. When the concrete is poured, the slurry returned from the tank is directly pumped into a recovery tank by a slurry pump to be used as the slurry for digging other slots, namely step S7).

S8) automatic viscosity detection of the recovered mud

And after the concrete pouring is finished, automatically detecting the recovered slurry to correspondingly adjust the viscosity of the slurry.

The device for automatically detecting the viscosity of the recovered mud is described in detail. Referring to fig. 4, the viscosity measuring device 50 includes a mahalanobis funnel, which is conventionally provided, and a mahalanobis funnel viscometer is composed of a cone 51 and a six-hole/cm (16 mesh) screen 60. The diameter of the upper opening of the cone is 152mm, the diameter of the lower opening of the cone 51 and the diameter of the draft tube 52 are 4.76mm, the length of the cone 51 is 305mm, and the total length of the funnel is 356 mm. An electric control switch 53 is arranged at the bottom of the flow guide pipe 52, and a fluid detector 54 is arranged at the inner bottom of the backflow pipe 52. Inside the cone 51 a mud detector 55 is arranged, the mud detector 55 being arranged flush with the screen 60. An electric controller 56 and a timer 57 are fixed outside the cone 51. The electric controller 56 is electrically connected to the electric control switch 53, the fluid detector 54, the slurry detector 55 and the timer 57, and electrically controls the components.

During specific measurement, the electric control switch 53 is in a closed state, the recovered slurry in the recovery tank is conveyed into the Mariotte funnel until the recovered slurry reaches the screen 60, and the slurry detector 55 detects that the recovered slurry reaches the height, and then slurry feeding is stopped. After a pause of a certain duration, the electric controller 56 controls the electric control switch to be turned on 53, and simultaneously turns on the timer 57 to count time, which is the first moment. After the recovered slurry is completely discharged, i.e., after the fluid detector 54 detects that no recovered slurry is discharged, the timer 57 is stopped to count the time, which is the second time. Therefore, the difference between the first time and the second time is expressed in seconds, and this value is expressed as the viscosity of the recovered slurry. Of course, if necessary, a temperature detector (not shown) is disposed inside the cone 51 to detect the temperature of the recovered slurry, where the viscosity of the recovered slurry is expressed as Xs (deg.c), and X represents the difference between the two moments.

It should be noted that the mounting position of the viscosity detection device 50 is not particularly limited. The device can be set in a single region, can be directly arranged on the slurry purification device, or can be arranged beside the slurry containing structure. In addition, a cleaning device can be arranged above the vertebral body 51, so that after one detection is finished, cleaning can be immediately carried out, and then a second detection is carried out. The cleaning device is also preferably controlled by an electronic controller 56.

S9) according to the detected viscosity data, correspondingly modulating the recovered mud

After the viscosity detection of the recovered slurry is completed, if the viscosity of the recovered slurry does not reach the standard, the corresponding adjustment treatment needs to be performed on the recovered slurry. When the viscosity index of the recovered slurry is reduced, correspondingly adding new slurry for adjustment; if the viscosity index of the recovered slurry is increased, a dispersant can be added for further adjustment.

Specifically, a prepared material adding device is needed for adjusting the viscosity of the recovered slurry, and the prepared material adding device comprises a new slurry cavity and a dispersing agent cavity. The new slurry cavity is communicated with the new slurry pool (slurry can be extracted through a slurry pump), the dispersing agent cavity contains the dispersing agent, the outlets of the new slurry cavity and the dispersing agent cavity are communicated with the recovery pool, and a valve is arranged at the outlet. In addition, a stirring device or a rolling device is arranged in the recovery tank, the stirring device or the rolling device is controlled by a controller, and the controller is also electrically connected with an electric controller of the viscosity detection device to receive and control information.

When the viscosity detection device detects that the viscosity of the recovered slurry is reduced, the electric controller transmits the information to the controller, and then the controller opens the new slurry valve, sends the new slurry to the new slurry cavity and then enters the recovery tank so as to increase and adjust the viscosity of the recovered slurry. Of course, the amount of fresh pulp to be delivered is added accordingly by the viscosity value detected by the viscosity detecting means. And after the new slurry is added, the controller starts the stirring device or the rolling device to uniformly stir the recovered slurry.

Similarly, when the viscosity detection device detects that the viscosity of the recovered slurry is increased, the electric controller transmits the information to the controller, and the controller opens the dispersing agent cavity and adds the dispersing agent into the recovery tank so as to reduce and adjust the viscosity of the recovered slurry. Of course, the amount of dispersant to be delivered is added accordingly by the viscosity value detected by the viscosity detecting means. After the dispersant is added, the controller starts the stirring device or the rolling device to uniformly stir the recovered slurry.

It is worth mentioning here that the brew chamber feeding device is preferably arranged above the recovery tank, so that the feed can be carried out directly by gravity during the feeding. Of course, the pump can be used for pumping when the device is installed at other positions.

S10) repeating the steps S8) and S9) until the viscosity of the recovered mud reaches the required standard

S11) finishing the pouring of the diaphragm wall

The structure and the working flow of the mud purification device are described in detail

At least, the mud purifying device comprises a first sand remover and a second sand remover (refer to fig. 5 in particular), and more preferably, the mud purifying device also comprises a centrifugal sand removing device.

Referring to FIG. 2, the operation of the slurry cleaning process is shown in FIG. 2. The recovered slurry recovered from the tank is first subjected to a primary sand filtration by a first sand remover to filter particles having a diameter greater than 6mm in the recovered slurry. And discharging the particles larger than 6mm to a slag collecting tank for outward transportation, and discharging the rest particles to a second sand remover for secondary sand filtering. And filtering the granules with the diameter larger than 0.06mm in the mortar slurry for the second time, wherein the granules with the diameter larger than 0.06mm are discharged to a slag collecting pool for outward transportation, and the rest are discharged to a circulating slurry mixing pool. In some projects poured by the method, the soil layer is a silty clay layer, and the fine particle content is high. Therefore, a bedroom centrifugal desanding device is arranged at the end part of the circulating slurry mixing tank, and fine particles with the diameter larger than 0.03mm in the slurry are removed.

In another embodiment, during this step of inserting the guide tube 30 and the air duct 20, the drill bit 24 at the output end of the air duct 20 is also turned on, and the fitting joint of the drill bit 24 is shown in fig. 3 and 3 a.

Specifically, the bottom of the air pipe 20 is provided with a connecting block 22, the connecting block 22 is provided with a plurality of air outlets 21, an air duct is arranged inside the connecting block 22, and the air duct is communicated with the air pipe 20 and the air outlets 21, so that air is discharged upwards from the air outlets 21.

The lower part of the connecting block 22 is provided with a motor 23, a drill 24 is arranged on the driving shaft of the motor 23, and the drill 24 is driven by the motor 23. The motor 23 is electrically connected to a switch provided at the gas delivery end of the air duct 20 or at the compressor 10 for convenient control by a user.

During the process of inserting the duct 30, the drill 24 is turned on, so that the rotation of the drill 24 can accelerate the submergence and quick repair of the duct 30, improve the working efficiency, and reduce the probability of the blockage of the air duct 20. After the conduit 30 is in place, the compressor 10 is turned on, so that the air duct 20 delivers air and the air is discharged upwards from the air outlet 21. Meanwhile, the sediment 40 is driven to turn over under the assistance of the drill 24, so that the air is conveniently blown out.

Referring to fig. 3, after the conduit 30 is inserted into the groove, the section extending out of the groove is connected to a wear-resistant elbow 31 and then to the discharge pipe. It can be appreciated that the provision of the wear resistant elbow 31 not only facilitates adjustment of the discharge direction, but also avoids damage to the pipe caused by multiple bends.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (4)

1. A construction method of a diaphragm wall is characterized by comprising the following steps:

s1) preparation of construction

S2) grooving construction; the grooving construction comprises the following steps:

a) digging a groove;

b) recycling and purifying the slurry generated by the grooving in the step a);

c) injecting new slurry into the groove to protect the wall while the step a) is carried out; or, while the step a) is carried out, injecting new slurry and the recovered slurry after the purification treatment into the tank for wall protection;

d) repeating steps a) to c) until the specification size of the tank meets the requirement;

e) performing sludge suction and hole cleaning on the interior of the groove to finish primary hole cleaning and form the groove;

s3) supplementing new slurry or supplementing new slurry and recovered slurry after purification treatment to the tank in the step e);

s4) hoisting a reinforcement cage into the finished groove supplemented with the slurry;

s5) carrying out bottom sediment treatment on the formed groove in the step S4) to finish secondary hole cleaning; wherein, adopt the gas lift method to handle the sediment, the gas lift method includes following step:

f) inserting a guide pipe and an air pipe into the bottom of the groove, and opening a drill bit positioned at the output end of the air pipe in the process of inserting the air pipe; the air pipe is inserted into the guide pipe and extends towards the bottom of the guide pipe; the bottom of the air pipe is provided with a connecting block, the lower part of the connecting block is provided with a motor, a driving shaft of the motor is provided with a drill bit, the drill bit is driven by the motor, and a switch for controlling the drill bit is arranged at the input end of the air pipe;

g) conveying gas to the air pipe;

h) removing sediments at the bottom of the forming tank through the guide pipe;

i) repeating the step g) and the step h), and after the sediment at the bottom of the forming tank reaches the standard, drawing out the guide pipe and the air pipe;

s6) pouring concrete into the grooving after the step i);

s7) recycling the slurry overflowing from the grooving while the step S6) is performed;

s8) carrying out automatic viscosity detection on the recovered mud obtained in the step S7);

s9) carrying out corresponding modulation on the recovered mud according to the viscosity data detected in S8);

s10) repeating the steps S8) and S9) until the viscosity of the recovered mud reaches the required standard;

s11) finishing the pouring of the diaphragm wall.

2. The diaphragm wall construction method according to claim 1, wherein the mud purification treatment in the step b) comprises the steps of:

b1) primary sand filtering, namely filtering particles with the diameter larger than 6mm in the recovered slurry;

b2) carrying out secondary sand filtration on the recovered slurry obtained in the step b1), and filtering particles with the diameter larger than 0.06mm in the slurry;

b3) and (4) putting the recovered slurry after the secondary sand filtration into a pool for precipitation for later use.

3. The diaphragm wall construction method according to claim 2, wherein the b4) step is further performed after the b3) step, and the b4) step is performed to centrifugally treat the recycled slurry entering the tank, so as to remove fine particles with the diameter of more than 0.03mm from the recycled slurry.

4. The diaphragm wall construction method as claimed in claim 1, wherein the step S1) includes a new slurry mixing step, the new slurry mixing step including the steps of:

j) adding water into the stirring barrel

k) Adding an additive into the stirring barrel, wherein the additive at least comprises bentonite powder and alkali powder;

l) stirring for at least 2min, adding CMC solution, and stirring for at least 1 min;

m) standing and expanding the stirred slurry for at least 24h to obtain new slurry.

Images