CN114032883B

CN114032883B - Double-wheel milling anti-seepage wall structure and construction process thereof

Info

Publication number: CN114032883B
Application number: CN202111426767.7A
Authority: CN
Inventors: 翁志敏; 黄杰; 刘春红; 胡先桥; 黄露
Original assignee: Hongan Hydropower Construction And Installation Co
Current assignee: Hongan Hydropower Construction And Installation Co
Priority date: 2021-11-27
Filing date: 2021-11-27
Publication date: 2023-03-31
Anticipated expiration: 2041-11-27
Also published as: CN114032883A

Abstract

The application discloses diaphragm wall structure is milled to double round and construction process thereof includes the following steps, S1, excavate in advance: firstly, a plurality of first-stage slot positions which are arranged at intervals are arranged, the first-stage slot positions are excavated in the vertical direction, corresponding soil is carried out of the slot holes, and meanwhile, slurry is poured into the slot holes; s2, double-wheel milling and excavating: further excavating the slotted hole by using a double-wheel mill, and simultaneously pouring slurry into the slotted hole; s3, pouring concrete slurry: gradually pouring concrete slurry to the bottom of the slotted hole, and simultaneously pouring the slurry to extract the slurry and temporarily store the slurry; s4, secondary slot position: and opening a second-stage slot position between two adjacent first-stage slot positions, and repeating the operation. This application has the effect that reduces the risk that the soil layer of slotted hole week side takes place easily to collapse, and can reduce slotted hole bottom silt accumulational risk.

Description

Double-wheel milling anti-seepage wall structure and construction process thereof

Technical Field

The application relates to the field of diaphragm wall structures, in particular to a diaphragm wall structure with a double-wheel milling machine and a construction process of the diaphragm wall structure.

Background

The impervious wall is an underground impervious building which is built by forming holes in a loose and permeable foundation of a gate dam by using a special machine and pouring concrete or cement clay mortar and the like into the holes. The diaphragm wall is built by sections, a slot is built into a wall section, and a plurality of wall sections are connected into a whole wall, so the diaphragm wall is also called as an underground diaphragm wall. The double-wheel milling is excavating equipment, has the advantages of strong stratum adaptability and high drilling efficiency and precision, and is widely applied to the construction of the impervious wall.

In the related art, a Chinese patent with the application number of CN201911221395.7 provides a construction process for a water-jet concrete diaphragm wall, which comprises the following steps: (1) preparing construction; 1) Setting out the construction axis of the water-jetting wall-building, leveling the field, and paving a track; 2) Lofting the center of the groove section, and dividing the groove section; 3) Moving the wall building machine to a transverse rail, and adjusting and detecting the wall building machine; (2) jetting water to build a wall; 1) Grooving the impervious wall; 2) Pouring concrete; and (3) carrying out integrity geophysical detection after the diaphragm wall is finished.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: because the slotted hole is firstly formed and then grouted, if the diaphragm wall to be built is deeper, and meanwhile, the inner wall of the slotted hole is not correspondingly supported, the soil layer on the peripheral side of the slotted hole is easy to collapse.

Disclosure of Invention

In order to solve the problem that soil layers on the peripheral sides of the slotted holes are prone to collapse in the construction process, the application provides a diaphragm wall structure with double milling wheels and a construction process of the diaphragm wall structure.

The application provides a diaphragm wall structure is milled to double round and construction process adopts following technical scheme:

in a first aspect, the application provides a construction process for a diaphragm wall structure through double-wheel milling, which adopts the following technical scheme:

a construction process for a double-wheel milling anti-seepage wall structure, which comprises the following steps,

s1, pre-excavation: firstly, a plurality of first-stage slot positions which are arranged at intervals are arranged, the first-stage slot positions are excavated in the vertical direction, corresponding soil is carried out of the slotted holes, and meanwhile, slurry is poured into the slotted holes;

s2, double-wheel milling and excavating: further excavating the slotted hole by double-wheel milling, and simultaneously pouring slurry into the slotted hole;

s3, pouring concrete slurry: gradually pouring concrete slurry to the bottom of the slotted hole, and simultaneously pouring the slurry to extract the slurry and temporarily store the slurry;

s4, secondary slot position: and opening a second-stage slot position between two adjacent first-stage slot positions, and repeating the operation.

Through adopting above-mentioned technical scheme, at the in-process of building the impervious wall, the in-process of seting up of slotted hole lasts to injecting the mud in the slotted hole, make and be full of mud in the slotted hole all the time, mud can provide the static pressure and utilize the inner wall that above-mentioned static pressure supported the slotted hole, partial mud infiltrates in the soil horizon of slotted hole week side and depends on the soil granule simultaneously, further reduce collapsing and the permeable rate of cell wall, with this effect that the soil horizon that realizes reducing slotted hole week side takes place the risk of collapsing easily, and can reduce the accumulational risk of slotted hole bottom silt.

Optionally, in both the step S1 and the step S2, a slurry circulation system is used to continuously pump out and filter the slurry in the slot, and simultaneously, the slurry is continuously injected into the slot.

As the double-wheel milling machine can generate more broken stones and soil in the hole opening process, and the broken stones and the soil are deposited at the bottom of the slotted hole to influence the subsequent grouting. By adopting the technical scheme, the slurry circulating system can pump out slurry in the slotted hole and bring out broken stones and soil generated by the open hole, and simultaneously continuously inject slurry into the slotted hole, so that the broken stones and the soil in the slotted hole can be gradually treated, and the quality of a subsequent concrete grouting layer can be improved; the slurry liquid level in the slotted hole can be continuously maintained, the inner wall of the slotted hole is continuously and stably supported, and the density of the slurry is conveniently regulated and controlled in the circulating process.

Optionally, the slurry circulating system comprises a slurry temporary storage mechanism, a slurry supplementing mechanism, a slurry input mechanism and a slurry extraction mechanism; the slurry temporary storage mechanism is used for transferring and storing slurry, the slurry supplementing mechanism is used for supplementing fresh slurry, the slurry input mechanism is used for conveying the slurry into the slotted hole from the slurry temporary storage mechanism, and the slurry extraction mechanism is used for conveying the slurry in the slotted hole to the slurry temporary storage mechanism and filtering and removing slag.

By adopting the technical scheme, in the process of opening the slotted hole, fresh slurry is supplemented to the slurry temporary storage mechanism by the slurry supplementing mechanism, the fresh slurry is conveyed into the slotted hole by the slurry input mechanism until the slotted hole is filled with the fresh slurry, secondary slurry is continuously extracted by the slurry extracting mechanism and conveyed to the slurry temporary storage mechanism, and meanwhile, mixed slurry formed by mixing the secondary slurry and the fresh slurry is continuously added into the slotted hole by the slurry input mechanism, so that continuous circulation of the slurry is realized, the slurry liquid level in the slotted hole can be maintained, and the secondary slurry is fully utilized.

Optionally, the slurry temporary storage mechanism comprises a fresh slurry tank communicated with the slurry supplementing mechanism, a secondary slurry tank communicated with the slurry pumping mechanism, and a transition tank communicated with both the fresh slurry tank and the secondary slurry tank.

Through adopting above-mentioned technical scheme, secondary mud jar separately stores secondary mud and fresh mud with fresh mud jar to mix mud through transition jar allotment, can keep fresh mud's cleanliness factor, and be convenient for allot the mixed mud of different proportions in the transition jar, the secondary mud of keeping in when seting up the interstitial period of different slotted holes simultaneously is of value to make full use of secondary mud, reduces the use of construction consumptive material and reduces construction cost.

Optionally, the slurry pumping mechanism comprises a slurry pumping pipe, a filter tank connected with the slurry pumping pipe, a third slurry pump communicated with the filter tank, and a cyclone separator connected with an outlet end of the third slurry pump, wherein the end of the slurry pumping pipe is located at the bottom of the slotted hole, and a liquid outlet of the cyclone separator is connected with the secondary slurry tank.

Through adopting above-mentioned technical scheme, after mud is taken out by the slotted hole, earlier filter out the great rubble of size and earth through the filtering ponds, carry to cyclone by third mud pump again through prefilter's mud, cyclone passes through the less rubble of size and the earth in the centrifugal force separation mud, and secondary mud jar can be got into to secondary filter's mud, both can reduce and pile up rubble and the earth in the slotted hole, also can reduce the risk that the third slush pump received the damage.

Optionally, the slurry circulation system further comprises a density control mechanism, wherein the density control mechanism comprises a densimeter arranged on the filter tank, a regulating hopper arranged on the periphery of the slot hole, an electric butterfly valve arranged at an outlet of the regulating hopper, and a first data processing MCU electrically connected with the densimeter and the electric butterfly valve; the adjusting hopper is used for placing the soil separated by the cyclone separator; the density meter is used for sensing density data of the slurry in the filter tank and transmitting the density data to the first data processing MCU; the first data processing MCU judges whether the density in the density data is lower than a threshold value, if the density data is lower than the threshold value, an opening control signal is sent out, and the electric butterfly valve is controlled to be opened, and if the density data is higher than the threshold value, a closing control signal is sent out, and the electric butterfly valve is controlled to be closed.

Through adopting above-mentioned technical scheme, at mud endless in-process, the densimeter lasts the density of monitoring mud in the filter tank, and with density data transmission to first data processing MCU, the mud density after filtering in the filter tank is closest to the mud density in the slotted hole, if above-mentioned density data is less than the threshold value, first data processing MCU sends and opens control signal and control electric butterfly valve and open, make the earth of adjusting in fighting fall in the slotted hole, can promote the mud density in the slotted hole, thereby both can keep the static pressure of mud, be of value to stably support the slotted hole inner wall, also can reduce the coming off of slotted hole inner wall silt, be of value to further restricting the accumulation of slotted hole interior silt.

Optionally, the slurry circulation system further comprises a liquid level monitoring mechanism, the liquid level monitoring mechanism comprises a plurality of liquid level meters, and the liquid level meters are respectively arranged in the filter tank, the fresh slurry tank, the secondary slurry tank and the transition tank.

Through adopting above-mentioned technical scheme, the level gauge can monitor the liquid level of mud in each container to according to the mud volume in the corresponding liquid level data calculation current system, thereby can prepare fresh mud accurately, reduce the mud of unnecessary production, be of value to the waste that reduces the building consumptive material.

Optionally, in the step S3, an auxiliary grouting mechanism is adopted to perform grouting on the slotted hole; the auxiliary grouting mechanism comprises a sieve plate which is movable in the slotted hole along the vertical direction, a grouting pipe which is arranged on the sieve plate in a penetrating manner, a plugging plate which is hinged on the sieve plate, a driving assembly for driving the sieve plate to lift and an adjusting assembly for controlling the plugging plate to swing; when the plugging plate is in a horizontal state, the plugging plate can plug the sieve pores of the sieve plate.

Through adopting above-mentioned technical scheme, when grout the slotted hole, order about the sieve through drive assembly earlier and descend along vertical direction, until descending to the slotted hole bottom, the shutoff board upset is ordered about to the rethread adjusting part, until the shutoff board is in horizontality and shutoff sieve mesh, rethread grout pipe injects the grout material into the slotted hole, drive assembly drives the sieve and rises gradually simultaneously, and the third slush pump continuously takes out mud, can accomplish the grout of slotted hole, both can stably support the slotted hole, also make the shutoff board can restrict the mixture of mud and concrete slurry, be favorable to promoting concrete layer's quality.

Optionally, the adjusting assembly comprises an underwater distance meter arranged on the sieve plate, a submersible motor arranged on the sieve plate, and a second data processing MCU electrically connected with the underwater distance meter and the submersible motor; the underwater distance meter is used for detecting the vertical distance between the sieve plate and the bottom wall of the slotted hole and transmitting the vertical distance data to the second data processing MCU; and the second data processing MCU judges whether the vertical distance in the vertical distance data is lower than a threshold value, and if the vertical distance is lower than the threshold value, the second data processing MCU sends a control signal and controls the submersible motor to drive the plugging plate to rotate to a horizontal state.

Through adopting above-mentioned technical scheme, at the decline in-process of sieve, the distancer can detect the vertical interval between sieve and the slotted hole diapire under water, and with vertical interval data transmission to second data processing MCU, until vertical interval is less than the threshold value, second data processing MCU sends control signal, and control submersible motor orders about the shutoff board and rotates to the horizontality, can accomplish the shutoff of sieve mesh, both can keep the quick decline of sieve, also can the shutoff board in time the sieve mesh of shutoff sieve.

In a second aspect, the application provides a diaphragm wall structure is milled to double round, adopts following technical scheme:

the double-wheel milling anti-seepage wall structure is manufactured by adopting the construction process of the double-wheel milling anti-seepage wall structure and comprises a plurality of first slotted holes and second slotted holes which are formed in the ground, the first slotted holes and the second slotted holes are communicated with each other and are alternately arranged along the horizontal direction, and concrete layers are filled in the first slotted holes and the second slotted holes.

Through adopting above-mentioned technical scheme, the first slotted hole and the second slotted hole of interval construction can reduce the risk of collapsing, and concrete layer's stability is good.

In summary, the present application includes at least one of the following beneficial technical effects:

1. in the process of opening the slot hole, continuously injecting slurry into the top of the slot hole, simultaneously extracting the slurry at the bottom of the slot hole, removing broken stones and soil in the extracted slurry, and continuously using the slurry mixed by the treated secondary slurry and the fresh slurry for filling the slot hole, so that the broken stones and the soil in the slot hole can be gradually treated, and the quality of a subsequent concrete grouting layer can be improved; the slurry liquid level in the slotted hole can be continuously maintained, the inner wall of the slotted hole is continuously and stably supported, and the density of the slurry is conveniently regulated and controlled in the circulating process;

2. the density of the slurry in the slotted hole is monitored by the densimeter, and the density of the slurry in the slotted hole can be adjusted by controlling the opening or closing of the electric butterfly valve through the first data processing MCU, so that the static pressure of the slurry can be maintained, the inner wall of the slotted hole can be stably supported, the falling of silt on the inner wall of the slotted hole can be reduced, and the accumulation of the silt in the slotted hole can be further limited;

3. the liquid level meter can monitor the liquid level of the slurry in each container, and the volume of the slurry in the current system is calculated according to corresponding liquid level data, so that fresh slurry can be accurately prepared, the slurry produced in excess is reduced, and the waste of building consumables is reduced.

Drawings

Fig. 1 is a schematic overall structure diagram of a diaphragm wall structure of a double-wheel milling machine according to an embodiment of the application.

Fig. 2 is a flow chart of a construction process of a diaphragm wall structure by double-wheel milling according to an embodiment of the application.

Fig. 3 is a schematic structural diagram of a mud circulation system according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a slurry temporary storage mechanism, a slurry supplement mechanism and a slurry input mechanism according to an embodiment of the present application.

FIG. 5 is a schematic structural diagram of a filter tank, a liquid level meter and a density control mechanism according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of an auxiliary grouting mechanism according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a screen plate, a plugging plate and an adjusting assembly according to an embodiment of the application.

Reference numerals are as follows: 11. a first slot; 12. a second slot; 13. a concrete layer; 2. a slurry temporary storage mechanism; 21. a fresh mud tank; 22. a secondary mud tank; 23. a transition tank; 231. a three-way pipe; 232. adjusting a valve; 3. a slurry replenishing mechanism; 31. a stirring tank; 32. a first mud pump; 4. a slurry input mechanism; 41. a pulp conveying pipe; 42. a second mud pump; 5. a slurry pumping mechanism; 51. a slurry pumping pipe; 52. a filtration tank; 53. a third slurry pump; 54. a cyclone separator; 6. a density control mechanism; 61. a densitometer; 62. adjusting the hopper; 63. an electric butterfly valve; 64. a first data processing MCU; 7. a liquid level meter; 8. an auxiliary grouting mechanism; 81. a sieve plate; 82. grouting pipes; 83. a plugging plate; 84. a winch; 85. an adjustment assembly; 851. an underwater rangefinder; 852. a submersible motor; 853. and a second data processing MCU.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses diaphragm wall structure is milled to double round. Referring to fig. 1, the diaphragm wall structure for the double-wheel mill includes a plurality of first slots 11 and second slots 12 opened on the ground along a vertical direction, the plurality of first slots 11 and the plurality of second slots 12 are communicated with each other and alternately arranged along a horizontal direction, and concrete layers 13 are filled in the first slots 11 and the second slots 12.

Referring to fig. 2, the embodiment of the application further discloses a construction process of the diaphragm wall structure for double-wheel milling, which is used for manufacturing the diaphragm wall structure for double-wheel milling and comprises the following steps:

s1, pre-excavation: firstly, a plurality of first-stage groove positions which are arranged at intervals are arranged by a grab bucket machine, the first-stage groove positions are excavated in the vertical direction, corresponding soil is conveyed out of a first groove hole 11, the long side dimension of the first groove hole 11 is not more than 4 m, the wide side dimension of the first groove hole is not more than 2 m, the pre-excavation depth of the grab bucket machine is not more than 40 m, and meanwhile, a slurry circulating system continuously pours slurry into the first groove hole 11, wherein the slurry mainly comprises bentonite, admixtures and water.

The mud can provide static pressure and utilize above-mentioned static pressure to support the inner wall of slotted hole, and partial mud infiltrates in the soil horizon of slotted hole week side and depends on soil granule simultaneously, further reduces the collapse and the water permeability of cell wall to this realization reduces the effect that the risk of collapsing easily takes place for the soil horizon of slotted hole week side, and can reduce the accumulational risk of slotted hole bottom silt.

S2, double-wheel milling and excavating: the first slot 11 is further excavated by means of a double wheel mill while the mud circulation system continuously pours mud into the slot and continuously extracts and filters the mud in the first slot 11, continuously circulating and filtering the mud.

The slurry circulating system can extract slurry in the slotted hole and bring out broken stone and soil generated by the opening, and simultaneously continuously inject slurry into the slotted hole, so that broken stone and soil in the slotted hole can be gradually treated, and the quality of a subsequent concrete layer 13 can be improved; the slurry liquid level in the slotted hole can be continuously maintained, the inner wall of the slotted hole is continuously and stably supported, and the density of the slurry is conveniently regulated and controlled in the circulating process.

S3, pouring concrete slurry: concrete slurry is gradually poured into the bottom of the first slotted hole 11 through the auxiliary grouting mechanism 8, meanwhile, slurry is gradually pumped out through the slurry circulating system and temporarily stored until the first slotted hole 11 is filled with the concrete slurry, and a concrete layer 13 is formed in the first slotted hole 11 after standing and curing.

S4, secondary slot position: and forming a second-stage slot between two adjacent first-stage slots, and repeating the operation, thereby forming a second slot hole 12 and forming a concrete layer 13 in the second slot hole 12. The first and second slotted

holes

11 and 12 constructed at intervals can reduce the risk of collapse and the stability of the concrete layer 13 is good.

Referring to fig. 3 and 4, the slurry circulating system includes a slurry temporary storage mechanism 2, a slurry supplement mechanism 3, a slurry input mechanism 4, a slurry extraction mechanism 5, a density control mechanism 6 and a liquid level monitoring mechanism. Wherein, mud temporary storage mechanism 2 is used for the transfer and stores mud, and mud complementary unit 3 is used for replenishing fresh mud, and mud input mechanism 4 is used for carrying mud to the slotted hole in by mud temporary storage mechanism 2, and mud pumping-out mechanism 5 is used for carrying the mud in the slotted hole to mud temporary storage mechanism 2 and filter the slagging-off, and density control mechanism 6 is used for monitoring and controls the density of the mud in the slotted hole, and liquid level monitoring mechanism is used for the total volume of mud in the monitoring system.

In the process of opening the slotted hole, fresh slurry is supplemented to the slurry temporary storage mechanism 2 by the slurry supplementing mechanism 3, the fresh slurry is conveyed into the slotted hole through the slurry input mechanism 4 until the slotted hole is filled with the fresh slurry, secondary slurry is continuously extracted through the slurry extracting mechanism 5 and conveyed to the slurry temporary storage mechanism 2, meanwhile, mixed slurry formed by mixing the secondary slurry and the fresh slurry is continuously added into the slotted hole by the slurry input mechanism 4, continuous circulation of the slurry is achieved, the slurry liquid level in the slotted hole can be kept, the secondary slurry is fully utilized, meanwhile, the density of the slurry in the slotted hole is continuously monitored by the density control mechanism 6, the density of the slurry is always in a normal range, stable static pressure can be kept, the total volume of the slurry in the system can be continuously monitored by the liquid level monitoring mechanism, preparation of the fresh slurry can be accurately controlled, and waste of building consumables is avoided.

Referring to fig. 3 and 4, the slurry temporary storage mechanism 2 includes a fresh slurry tank 21 communicated with the slurry replenishing mechanism 3, a secondary slurry tank 22 communicated with the slurry pumping mechanism 5, and a transition tank 23 communicated with both the fresh slurry tank 21 and the secondary slurry tank 22, the transition tank 23 is connected with a three-way pipe 231 through a flange, and the other two branch pipes of the three-way pipe 231 are connected with the fresh slurry tank 21 and the secondary slurry tank 22 through flanges respectively and are provided with regulating valves 232. The transition tank 23 may be provided therein with a stirring motor and a stirring blade, whereby the fresh slurry and the secondary slurry can be mixed.

In the mud circulation process, the secondary mud tank 22 and the fresh mud tank 21 store the secondary mud and the fresh mud separately, so that the cleanliness of the fresh mud can be kept; the flow of the slurry entering the transition tank 23 is controlled by the regulating valve 232, and the mixed slurry is prepared in the transition tank 23, so that the mixed slurry with different proportions can be prepared in the transition tank 23, and meanwhile, the secondary slurry is temporarily stored in the gap period of different slotted holes, thereby being beneficial to fully utilizing the secondary slurry, reducing the use of construction consumables and reducing the construction cost.

Referring to fig. 3 and 4, the slurry replenishing mechanism 3 includes a stirring tank 31 and a first slurry pump 32 connected to the stirring tank 31 through a pipe, and an outlet end of the first slurry pump 32 is connected to the fresh slurry tank 21 through a pipe. When the slurry needs to be prepared, various raw materials are stirred and mixed by the stirring tank 31, and then the fresh slurry is conveyed to the fresh slurry tank 21 by the first slurry pump 32.

Referring to fig. 3 and 4, the slurry feeding mechanism 4 comprises a slurry feeding pipe 41 and a second slurry pump 42 connected with the slurry feeding pipe through a flange, wherein the end part of the slurry feeding pipe 41 is positioned at the top of the slotted hole, and the outlet end of the second slurry pump 42 is connected with the transition tank 23 through a pipeline. When it is necessary to feed the slurry to the slot, the mixed slurry in the transition tank 23 is pumped out by the second slurry pump 42 and fed into the slot.

Referring to fig. 3 and 4, the slurry pumping mechanism 5 includes a slurry pumping pipe 51, a filter tank 52 flanged to the slurry pumping pipe 51, a third slurry pump 53 connected to the filter tank 52 through a pipe, and a cyclone 54 connected to an outlet end of the third slurry pump 53 through a pipe. The end of the slurry pumping pipe 51 is connected to the double-wheel mill, so that the end of the slurry pumping pipe 51 is continuously positioned at the bottom of the slotted hole, and impurities in the slotted hole can be more thoroughly pumped out. The outlet of the cyclone 54 is connected to the secondary slurry tank 22.

After the slurry is pumped out from the slotted hole, crushed stones and soil with larger sizes are filtered out by the filter tank 52, the slurry after primary filtration is conveyed to the cyclone separator 54 by the third slurry pump 53, the crushed stones and soil with smaller sizes in the slurry are separated out by the cyclone separator 54 through centrifugal acting force, and the slurry after secondary filtration can enter the secondary slurry tank 22, so that the crushed stones and soil accumulated in the slotted hole can be reduced, and the risk of damage to the third slurry pump 53 can be reduced.

Referring to fig. 3 and 5, the density control mechanism 6 includes a density meter 61 provided on the filter tank 52 by screws, a regulating hopper 62 provided on the periphery of the groove hole, an electric butterfly valve 63 provided at the outlet of the regulating hopper 62 by a flange, and a first data processing MCU64 electrically connected to the density meter 61 and the electric butterfly valve 63. The surge bin 62 is used to hold the dirt separated by the cyclone 54.

Referring to fig. 3 and 5, the densitometer 61 is used to sense density data of the slurry in the filtration tank 52 and transmit the density data to the first data processing MCU64. The first data processing MCU64 judges whether the density in the density data is lower than a threshold value, sends an opening control signal and controls the electric butterfly valve 63 to open if the density in the density data is lower than the threshold value, and sends a closing control signal and controls the electric butterfly valve 63 to close if the density in the density data is higher than the threshold value. The threshold value for the density may be set at 1.1g/ml, 1.13g/ml or 1.15g/ml, in the present example at 1.15g/ml.

In the process of mud circulation, the densimeter 61 continuously monitors the density of the mud in the filter tank 52 and transmits density data to the first data processing MCU64, the density of the mud filtered in the filter tank 52 is closest to the density of the mud in the slot, if the density data is lower than a threshold value, the first data processing MCU64 sends an opening control signal and controls the electric butterfly valve 63 to open, so that the mud in the adjusting hopper 62 falls into the slot, the density of the mud in the slot can be improved, the static pressure of the mud can be maintained, the stable support of the inner wall of the slot can be facilitated, the falling of the silt on the inner wall of the slot can be reduced, and the further limitation of the accumulation of the silt in the slot can be facilitated.

Referring to fig. 3 and 5, the liquid level monitoring mechanism includes a plurality of liquid level meters 7, and the plurality of liquid level meters 7 are respectively disposed in the filtering tank 52, the fresh mud tank 21, the secondary mud tank 22, and the transition tank 23. The liquid level meter 7 can monitor the liquid level of the slurry in each container, and the volume of the slurry in the current system is calculated according to corresponding liquid level data, so that fresh slurry can be accurately prepared, the slurry produced in excess is reduced, and the waste of building consumables is reduced.

Referring to fig. 6 and 7, the auxiliary grouting mechanism 8 includes a screen plate 81 movable in a slot along a vertical direction, a grouting pipe 82 penetrating through the center of the screen plate 81, a plugging plate 83 hinged on the screen plate 81, a driving assembly for driving the screen plate 81 to ascend and descend, and an adjusting assembly 85 for controlling the plugging plate 83 to swing. The plugging plates 83 are arranged in two and symmetrically arranged at two sides of the grouting pipe 82. The end parts of the two plugging plates 83 which are far away from each other are welded with horizontal rods, and the horizontal rods penetrate through the plugging plates 83, so that the plugging plates 83 swing around the axis of the horizontal rods. When the plugging plate 83 is in a horizontal state, the plugging plate 83 can plug the meshes of the sieve plate 81. The drive assembly comprises a hoist 84, the tow line of the hoist 84 being connected to the screen panel 81.

Referring to fig. 6 and 7, the adjustment assembly 85 includes an underwater rangefinder 851 provided on a lower surface of the sieve plate 81 by a screw, a submersible motor 852 installed on the sieve plate 81 by a bolt, and a second data processing MCU853 electrically connected to both the underwater rangefinder 851 and the submersible motor 852. The diving motors 852 are provided with two parts which are in one-to-one correspondence with the horizontal rods, and output shafts of the diving motors 852 are coaxially connected with the horizontal rods.

And the underwater distance measuring instrument 851 is used for detecting the vertical distance between the sieve plate 81 and the bottom wall of the slotted hole and transmitting the vertical distance data to the second data processing MCU853. The second data processing MCU853 determines whether the vertical distance in the vertical distance data is lower than a threshold, and sends a control signal if the vertical distance is lower than the threshold, and controls the submersible motor 852 to drive the blocking plate 83 to rotate to a horizontal state. The threshold value for the vertical separation may be set to 0.3 meter, 0.4 meter or 0.5 meter, with 0.3 meter being chosen in the embodiments of the present application.

When the slotted hole is grouted, the screen plate 81 is driven to descend in the vertical direction through the winch 84 firstly until the screen plate descends to the bottom of the slotted hole, the underwater range finder 851 can detect the vertical distance between the screen plate 81 and the bottom wall of the slotted hole, the vertical distance data is transmitted to the second data processing MCU853 until the vertical distance is lower than a threshold value, the second data processing MCU853 sends a control signal, the submersible motor 852 is controlled to drive the plugging plate 83 to rotate to the horizontal state, the sieve hole of the screen plate 81 is plugged, grouting material is injected into the slotted hole through the grouting pipe 82, meanwhile, the winch 84 drives the screen plate 81 to gradually ascend, the third slurry pump 53 continuously pumps out the slurry, grouting of the slotted hole can be completed, the slotted hole can be stably supported, the plugging plate 83 can limit mixing of the slurry and concrete slurry, and the quality of the concrete layer 13 is improved.

The implementation principle of the diaphragm wall structure for double-wheel milling and the construction process thereof in the embodiment of the application is as follows: in the process of constructing the anti-seepage wall, various raw materials are stirred and mixed through the stirring tank 31, then fresh slurry is conveyed to the fresh slurry tank 21 through the first slurry pump 32, and slurry is continuously injected into the slotted hole through the slurry conveying pipe 41 and the second slurry pump 42 in the process of opening the slotted hole, so that the slotted hole is always filled with the slurry, the slurry can provide static pressure, and the inner wall of the slotted hole is supported by the static pressure;

and then the third slurry pump 53 and the slurry pumping pipe 51 continuously pump the slurry in the slotted hole, and crushed stones and mud blocks in the slurry are separated through the filter tank 52 and the cyclone separator 54, and the filtered slurry is conveyed into the secondary slurry tank 22, and then the second slurry pump 42 and the slurry conveying pump continuously convey the mixed slurry in the transition tank 23 back into the slotted hole, so that the circulation of the slurry is realized, the inner wall of the slotted hole can be stably supported, and the risk that the soil layer on the peripheral side of the slotted hole is easy to collapse is reduced.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A construction process for a diaphragm wall structure by double-wheel milling is characterized in that: comprises the following steps of (a) carrying out,

s3, pouring concrete slurry: gradually pouring concrete slurry to the bottom of the slotted hole, and simultaneously pouring the slurry to extract the slurry and temporarily store the slurry; the device comprises a mechanism for pouring slurry, wherein the mechanism for pouring the slurry is an auxiliary grouting mechanism (8), and the auxiliary grouting mechanism (8) comprises a sieve plate (81) which is vertically movable in a slotted hole, a grouting pipe (82) which is arranged on the sieve plate (81) in a penetrating manner, a plugging plate (83) hinged on the sieve plate (81), a driving component for driving the sieve plate (81) to lift and an adjusting component (85) for controlling the plugging plate (83) to swing;

when the blocking plate (83) is in a horizontal state, the blocking plate (83) can block the sieve holes of the sieve plate (81);

the adjusting assembly (85) comprises an underwater distance meter (851) arranged on the sieve plate (81), a submersible motor (852) arranged on the sieve plate (81) and a second data processing MCU (853) which is electrically connected with the underwater distance meter (851) and the submersible motor (852);

the underwater distance measuring instrument (851) is used for detecting the vertical distance between the sieve plate (81) and the bottom wall of the slotted hole, forming vertical distance data and transmitting the vertical distance data to the second data processing MCU (853);

the second data processing MCU (853) judges whether the vertical distance in the vertical distance data is lower than a threshold value, if so, a control signal is sent out, and the submersible motor (852) is controlled to drive the blocking plate (83) to rotate to a horizontal state;

s4, secondary slot position: and opening a second-stage slot between two adjacent first-stage slots, and repeating the operations in the S1-S3.

2. The construction process of the double-wheel milling cut-off wall structure according to claim 1, characterized in that: and in the S1 step and the S2 step, a slurry circulating system is adopted to continuously extract and filter the slurry in the slotted hole, and simultaneously, the slurry is continuously injected into the slotted hole.

3. The construction process of the diaphragm wall structure of the double-wheel mill according to claim 2, characterized in that: the mud circulating system comprises a mud temporary storage mechanism (2), a mud supplementing mechanism (3), a mud input mechanism (4) and a mud extraction mechanism (5);

the slurry temporary storage mechanism (2) is used for transferring and storing slurry, the slurry supplementing mechanism (3) is used for supplementing fresh slurry, the slurry input mechanism (4) is used for conveying the slurry into the slotted hole from the slurry temporary storage mechanism (2), and the slurry extraction mechanism (5) is used for conveying the slurry in the slotted hole to the slurry temporary storage mechanism (2) and filtering and deslagging.

4. The construction process of the double-wheel milling diaphragm wall structure according to claim 3, characterized in that: the slurry temporary storage mechanism (2) comprises a fresh slurry tank (21) communicated with the slurry supplementing mechanism (3), a secondary slurry tank (22) communicated with the slurry pumping mechanism (5) and a transition tank (23) communicated with the fresh slurry tank (21) and the secondary slurry tank (22).

5. The construction process of the double-wheel milling diaphragm wall structure according to claim 4, characterized in that: the slurry pumping mechanism (5) comprises a slurry pumping pipe (51), a filtering tank (52) connected with the slurry pumping pipe (51), a third slurry pump (53) communicated with the filtering tank (52), and a cyclone separator (54) connected with the outlet end of the third slurry pump (53), wherein the end part of the slurry pumping pipe (51) is positioned at the bottom of the slotted hole, and the liquid outlet of the cyclone separator (54) is connected with the secondary slurry tank (22).

6. The construction process of the double-wheel milling diaphragm wall structure according to claim 5, characterized in that: the mud circulating system also comprises a density control mechanism (6), wherein the density control mechanism (6) comprises a densimeter (61) arranged on the filtering tank (52), an adjusting hopper (62) arranged on the periphery of the slotted hole, an electric butterfly valve (63) arranged at the outlet of the adjusting hopper (62) and a first data processing MCU (64) electrically connected with the densimeter (61) and the electric butterfly valve (63);

the adjusting hopper (62) is used for placing the soil separated by the cyclone separator (54);

the density meter (61) is used for sensing density data of the slurry in the filter tank (52) and transmitting the density data to the first data processing MCU (64);

the first data processing MCU (64) judges whether the density in the density data is lower than a threshold value, if so, sends an opening control signal and controls the electric butterfly valve (63) to open, and if not, sends a closing control signal and controls the electric butterfly valve (63) to close.

7. The construction process of the double-wheel milling diaphragm wall structure according to claim 5, characterized in that: the mud circulation system further comprises a liquid level monitoring mechanism, the liquid level monitoring mechanism comprises a plurality of liquid level meters (7), and the liquid level meters (7) are respectively arranged in the filter tank (52), the fresh mud tank (21), the secondary mud tank (22) and the transition tank (23).

8. A diaphragm wall structure of a twin-wheel mill, which is manufactured by adopting the construction process of the diaphragm wall structure of the twin-wheel mill according to any one of claims 1 to 7, and is characterized in that: the concrete filling structure comprises a plurality of first slotted holes (11) and second slotted holes (12) which are arranged on the ground, wherein the first slotted holes (11) and the second slotted holes (12) are communicated with each other and are alternately arranged along the horizontal direction, and concrete layers (13) are filled in the first slotted holes (11) and the second slotted holes (12).