CN111705784A

CN111705784A - Slurry circulating system in underground continuous wall construction and recycling method

Info

Publication number: CN111705784A
Application number: CN202010540991.8A
Authority: CN
Inventors: 王兴宇; 刘海龙; 杨重; 李志强
Original assignee: China Road and Bridge Corp
Current assignee: China Road and Bridge Corp
Priority date: 2020-05-28
Filing date: 2020-06-15
Publication date: 2020-09-25
Anticipated expiration: 2040-06-15
Also published as: CN111705784B

Abstract

The invention discloses a slurry circulating system in underground continuous wall construction, which comprises: the novel slurry processing device comprises a clean water tank, a stirrer, a novel slurry tank, a mixed slurry tank, an old slurry processing tank, a slurry pump and a multi-section sliding track which is detachably connected, wherein the clean water tank, the stirrer, the novel slurry tank, the mixed slurry tank, the old slurry processing tank and the bottom of the slurry pump are respectively provided with a roller which is in butt joint with the sliding track through the roller and can move on the sliding track, the clean water tank, the stirrer, the novel slurry tank and the mixed slurry tank are sequentially connected through a first water pipeline, the mixed slurry tank is communicated with the old slurry processing tank through a return pipe, the clean water tank is connected with the old slurry processing tank through a second water pipeline, and the slurry pump is communicated with the old slurry processing tank through a slurry return pipe. The method is energy-saving and environment-friendly and is convenient to use.

Description

Slurry circulating system in underground continuous wall construction and recycling method

Technical Field

The invention relates to the technical field of diaphragm wall construction. More particularly, the invention relates to a mud circulation system in underground continuous wall construction and a recycling method.

Background

The underground continuous wall is a remote foundation engineering, and is characterized by that on the ground a groove-digging machine is adopted, along the peripheral axis of the deep excavation engineering, under the condition of slurry wall-protecting the wall a long and narrow deep groove is excavated, after the groove is cleaned, the reinforcing bar cage is suspended in the deep groove, then the underwater concrete is poured by means of conduit method to form a unit groove section, so that it can be implemented section by section, and a continuous reinforced concrete wall can be built underground, and can be used as water-stopping, seepage-proofing, bearing and water-retaining structure. In the diaphragm wall work progress, all need to use a lot of mud before digging groove, hanging the steel reinforcement cage, and also need arrange the thick liquid with pouring the concrete in-process in digging groove, discharged mud often handles as useless thick liquid, the resource-wasting, and if handle not can the polluted environment well.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.

Still another object of the present invention is to provide a slurry circulation system for underground diaphragm wall construction, which processes old slurry through an old slurry processing tank to realize reuse of the old slurry.

To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a mud circulation system in underground diaphragm wall construction, comprising:

the slurry pump comprises a clean water tank, a stirrer, a new slurry tank, a mixed slurry tank, an old slurry treatment tank, a slurry pump and a multi-section detachably connected sliding track, wherein the sliding track comprises a linear sliding track and an arc sliding track, the sliding track is a horizontally arranged plate, a pair of sliding chutes with upward openings are arranged on the sliding track, the width of each sliding chute on the arc sliding track is larger than that of each sliding chute on the linear sliding track, a plurality of pairs of limiting holes are arranged on the side wall of each sliding chute at intervals, the clean water tank, the stirrer, the new slurry tank, the mixed slurry tank, the old slurry treatment tank and the bottom of the slurry pump are all connected with the tops of a plurality of pairs of supporting frames, connecting shafts are arranged at the bottoms of the supporting frames and are all connected with first idler wheels through bearings, and each pair of first idler wheels at the bottoms of each pair of supporting frames are respectively and correspondingly arranged in a pair of sliding, the depth of the sliding groove is slightly smaller than the difference value of the inner diameter and the outer diameter of the first roller, limiting rods are inserted into paired limiting holes on the side wall of the sliding groove, which are close to the front and the rear of the first roller, the clean water tank, the new slurry tank and the mixed slurry tank are sequentially connected through a first water pipeline, the mixed slurry tank is communicated with the old slurry treatment tank through a return pipe, the clean water tank is connected with the old slurry treatment tank through a second water pipeline, and the slurry pump is communicated with the old slurry treatment tank through a slurry return pipe.

Preferably, in the slurry circulating system in the underground diaphragm wall construction, the old slurry treatment tank comprises a first-stage filter tank, a second-stage filter tank and an old slurry tank which are sequentially arranged from top to bottom, a plurality of support plates are vertically arranged at the top of the side wall of the old slurry tank, a first support plate and a second support plate are horizontally arranged on the support plates from top to bottom, a plurality of second rollers are arranged on the second support plate, the second-stage filter tank is arranged between the first support plate and the second support plate, the first-stage filter tank is positioned on the first support plate, one side wall of the first-stage filter tank and one side wall of the second-stage filter tank are both provided with openable cover plates, the other side wall of the first-stage filter tank opposite to one side wall of the first-stage filter tank and the other side wall of the second-stage filter tank opposite to one side wall of the second-stage filter tank are respectively provided with, the mud pump comprises a primary filter tank, a secondary filter tank, scrapers, pulleys, a slurry return pipe and a primary filter tank, wherein the scrapers are vertically arranged in the primary filter tank, the two ends of each scraper are provided with hooks, the free ends of the hooks are provided with the pulleys, the tops of the opposite side walls, fixed to the secondary filter tank, of the primary filter tank are provided with grooves, the pulleys are arranged in the corresponding grooves and can slide in the grooves, the scrapers are arranged on one sides of cover plates, and the slurry pump is communicated with the primary filter tank through the slurry return pipe.

Preferably, underground continuous wall construction in the mud circulation system, still be provided with the filler device on the old thick liquid pond, the filler device includes the storage case, the storage roof portion sets up the feed inlet, the storage bottom of the case portion is for leaking hopper-shaped, the storage bottom of the case portion is provided with the discharge gate, the storage bottom of the case portion discharge gate department level is provided with a pair of current-limiting spout that the opening is relative, the interpolation of current-limiting spout is equipped with can be in its internal slip current-limiting plate, current-limiting plate will the discharge gate shutoff.

Preferably, in the mud circulation system in the construction of underground diaphragm wall, the height of the scraper blade in the primary filter tank is less than the distance from the bottom surface to the first mud hole in the primary filter tank, and the height of the scraper blade in the secondary filter tank is less than the distance from the bottom surface to the second mud hole in the secondary filter tank.

Preferably, in the slurry circulating system in the underground continuous wall construction, stirring devices are arranged in the mixed slurry tank and the old slurry tank.

Preferably, in the slurry circulating system for underground diaphragm wall construction, valves are arranged on the first water pipe, the return pipe and the second water pipe, and the first water pipe comprises a plurality of first water pipes which are detachably connected.

The invention also provides a recycling method of the slurry circulating system, which comprises the following steps:

step one, continuing the splicing of the sliding track of the previous section of construction site and fixing a plurality of sections of sliding tracks to the next section of construction site; when the current construction site and the underground continuous wall prepared at the next construction site are horizontally connected, only linear sliding rails are needed to be spliced with each other; when the front construction site is connected with the underground continuous wall prepared at the next construction site at a certain angle, the arc-shaped sliding rails and the linear sliding rails at the two ends are spliced at the corners of the wall body;

secondly, removing the limiting rod on the sliding track of the previous construction site, pushing each device of the slurry circulating system to slide on the multi-section sliding track to the next construction site, inserting the limiting rod into the limiting hole at the corresponding position of the roller on each device, and then constructing; the moving speed of each device of the slurry circulating system on the arc-shaped sliding track is less than that of each device on the linear sliding track;

and step three, recovering the multi-section sliding rail on the previous section of construction site for later use.

The invention at least comprises the following beneficial effects: the slurry circulating system in the underground continuous wall construction is simple in structure and reliable in operation; the sliding track is movably connected with each device, so that the moving position of each device is convenient; the sliding track is provided with a limiting device, so that the movement of each device in the operation process is effectively avoided; slag removing devices are arranged in the primary filtering tank and the secondary filtering tank, so that the primary filtering tank and the secondary filtering tank can be cleaned conveniently.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic top view of a slurry circulation system in the construction of an underground diaphragm wall according to the present invention;

FIG. 2 is a schematic view of the structure of the sliding track of the present invention;

FIG. 3 is a schematic view of the structure of a used pulp treating tank according to the present invention;

FIG. 4 is a schematic structural view of a secondary filtration tank according to the present invention;

fig. 5 is a schematic structural diagram of a packing device.

Wherein, 1-a clean water tank, 2-a stirrer, 3-a newly-manufactured slurry tank, 4-a mixed slurry tank, 5-an old slurry treatment tank, 51-an old slurry tank, 52-a support plate, 53-a second support plate, 54-a second roller, 55-a second-stage filter tank, 551-a groove, 552-a second slurry hole, 553-a scraper, 554-a hook, 555-a pulley, 556-an openable cover plate, 56-a first support plate, 57-a first-stage filter tank, 571-a first slurry hole, 6-a slurry pump, 7-a wall construction site, 8-a slurry return pipe, 9-a return pipe, 10-a sliding rail, 101-a linear sliding rail, 102-an arc sliding rail, 103-a chute, 11-a second water conveying pipe and 12-a first water conveying pipe, 13-a filling device, 131-a storage box, 132-a flow-limiting chute and 133-a flow-limiting plate.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly and can, for example, be fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

As shown in fig. 1 and 2, the present invention provides a slurry circulation system for underground diaphragm wall construction, comprising:

the slurry mixing device comprises a clean water tank 1, a stirrer 2, a new slurry tank 3, a mixed slurry tank 4, an old slurry treatment tank 5, a slurry pump 6 and a multi-section detachably connected sliding rail 10, wherein the sliding rail comprises a linear sliding rail 101 and an arc sliding rail 102, the sliding rail 10 is a horizontally arranged plate, a pair of sliding chutes 103 with upward openings are arranged on the sliding rail 10, the chute width on the arc sliding rail 102 is larger than that on the linear sliding rail 101, a plurality of pairs of limiting holes are arranged on the side wall of each sliding chute 103 at intervals, the clean water tank 1, the stirrer 2, the new slurry tank 3, the mixed slurry tank 4, the old slurry treatment tank 5 and the slurry pump 6 are connected with the tops of a plurality of pairs of support frames, connecting shafts are arranged at the bottoms of the support frames, and are connected with a first roller through bearings, every pair of first gyro wheel of every pair of support frame bottom corresponds respectively to set up in a pair of spout 103 and can roll in its inside, spout 103 groove depth slightly is less than the difference of first gyro wheel inside and outside footpath size, it has the gag lever post all to insert on the spout 103 lateral wall near the spacing downthehole in pairs around the first gyro wheel, clean water basin 1, mixer 2, newly-made mud jar 3, mixed mud pond 4 is connected in order through first conduit 12, mixed mud pond 4 through back flow 9 with old thick liquid processing pond 5 intercommunication, clean water basin 1 through second conduit 11 with old thick liquid processing pond 5 links to each other, slush pump 6 through mud return 8 with old thick liquid processing pond 5 intercommunication.

The technical scheme provides a slurry circulating system in underground continuous wall construction, which comprises a clean water tank 1, a stirrer 2, a new slurry tank 3, a mixed slurry tank 4, an old slurry treatment tank 5, a slurry pump 6 and a multi-section detachably connected sliding rail 10, wherein the multi-section sliding rail 10 comprises a linear sliding rail 101 and an arc sliding rail 102, the sliding rail 10 is a horizontally arranged plate, a pair of chutes 103 with upward openings are arranged on the sliding rail 10, the chute width on the arc sliding rail 102 is larger than that on the linear sliding rail 101, a plurality of pairs of limiting holes are arranged on the side wall of the chute 103 at intervals, the clean water tank 1, the stirrer 2, the new slurry tank 3, the mixed slurry tank 4, the old slurry treatment tank 5 and the bottom of the slurry pump 6 are connected with a plurality of pairs of supporting frame tops, a connecting shaft is arranged at the bottom of the supporting frame, and is connected with a first roller through a bearing, each pair of first rollers at the bottom of each pair of supporting frames are respectively and correspondingly arranged in a pair of sliding grooves 103 and can roll in the sliding grooves 103, the groove depth of each sliding groove 103 is slightly smaller than the difference value of the inner diameter and the outer diameter of each first roller, so that the supporting frames, the connecting shafts and the groove walls of the sliding grooves are prevented from generating strong collision or friction in the rolling process of the first rollers, limiting rods are inserted in paired limiting holes on the side walls of the sliding grooves 103, which are close to the front and the back of the first rollers and are used for limiting the, and then the position of each equipment is limited so as to prevent the equipment from moving in the construction process, the clean water tank 1, the stirrer 2, the new slurry tank 3 and the mixed slurry tank 4 are sequentially connected through a first water conveying pipeline 12, the mixed slurry tank 4 is communicated with the old slurry treatment tank 5 through a return pipe 9, the clean water tank 1 is connected with the old slurry treatment tank 5 through a second water conveying pipeline 11, and the slurry pump 6 is communicated with the old slurry treatment tank 5 through a slurry return pipe 8.

Various pipes in the slurry circulating system in the underground continuous wall construction can be made of elastic materials, so that the equipment can be conveniently connected in a bent angle or in a moving process. The width of the sliding groove on the arc-shaped sliding track is larger than that of the sliding groove on the linear sliding track, so that the first roller can turn conveniently.

The operation process of the slurry circulation system in the underground continuous wall construction comprises the following steps: adding a proper amount of slurry powder into a stirrer 2, supplying water to the stirrer 2 through a clean water tank 1, stirring, sending new slurry into a new slurry tank 3 through a first water conveying pipe 12 after uniform stirring, storing and accumulating the new slurry, sending the slurry in the new slurry tank 3 to a wall construction site 7 through one outlet according to construction requirements for direct use, or sending the slurry into a mixed slurry tank 4 through another outlet through a first water conveying pipe 12, sending the slurry into the wall construction site 7 from an outlet of the mixed slurry tank 4 after mixing and diluting treatment, pumping a waste slurry-sediment mixture generated in the wall construction process into an old slurry treatment tank 5 through a slurry pump 6, checking the quality of the waste slurry-sediment, adding required slurry raw materials into the old slurry treatment tank 5 according to the pulping requirements, adding water into the old slurry treatment tank 5 through the clean water tank 1, stirring and uniformly mixing, and then flowing into the wall construction site 7, the recycling of the waste slurry is realized, and under the condition that the slurry has no special strength requirement, the waste slurry recycled to the waste slurry treatment tank 5 can enter the mixed slurry tank 4 through the return pipe 9 to be mixed with the new slurry and then is sent to the wall construction site 7.

The slurry circulating system in the underground continuous wall construction is simple in structure and reliable in operation; the sliding track is movably connected with each device, so that the moving position of each device is convenient; the sliding track is provided with a limiting device, so that the movement of each device in the operation process is effectively avoided.

In another technical solution, as shown in fig. 1, 3 and 4, in the slurry circulation system for underground diaphragm wall construction, the old slurry treatment tank 5 includes a first filtering tank 57, a second filtering tank 55 and an old slurry tank 51 which are sequentially arranged from top to bottom, a plurality of supporting plates 52 are vertically arranged on the top of the side wall of the old slurry tank 51, a first supporting plate 56 and a second supporting plate 53 are horizontally arranged on the supporting plates 52 from top to bottom, a plurality of second rollers 54 are arranged on the second supporting plate 53, the second filtering tank 55 is arranged between the first supporting plate 56 and the second supporting plate 53, the first filtering tank 57 is positioned on the first supporting plate 56, an openable cover plate 556 is arranged on one side wall of the first filtering tank 57 and one side wall of the second filtering tank 55, and another side wall, opposite to one side wall, of the first filtering tank 57, The other side wall of the secondary filter tank 55 opposite to one side wall thereof is respectively provided with a first slurry hole 571 and a second slurry hole 552, the primary filter tank 57 and the secondary filter tank 55 are both vertically provided with scrapers 553, two ends of each scraper 553 are provided with hooks 554, free ends of the hooks 554 are provided with pulleys 555, tops of opposite side walls of the primary filter tank 57 and the secondary filter tank 55 are provided with grooves 551, the pulleys 555 are arranged in the corresponding grooves 551 and can slide in the grooves 551, the scrapers 553 are arranged on one side far away from the openable cover plate 556, and the slurry pump 6 is communicated with the primary filter tank 57 through the slurry return pipe 8.

The secondary filter tank 55 is arranged on the second roller 54 and can slide on the second roller, so that the secondary filter tank is convenient to disassemble; the primary filter tank 57 is placed on the first supporting plate 56 to facilitate the detachment thereof, and is supported by the first supporting plate 56, the secondary filter tank 55 is arranged between the first supporting plate 56 and the second supporting plate 53, and the size of the secondary filter tank 55 is larger than that of the primary filter tank 57 so as to receive the slurry flowing from the primary filter tank; an openable cover plate 556 is arranged on one side wall of each of the primary filtering tank 57 and the secondary filtering tank 55, the contact part of the openable cover plate 556 and the side wall is sealed, a slurry hole for slurry to flow out is formed in the side wall opposite to the openable cover plate 556, after the primary filtering tank 57 or the secondary filtering tank 55 is filled with large-particle slag, the large-particle slag is detached from the old slurry tank 51 and transported to a slag pit, the openable cover plate 556 is opened, an auxiliary device can be used for pushing a scraper 553, a pulley 555 at the position of a hook 554 on the scraper 553 slides in a corresponding groove 551 to push out the large-particle slag in the corresponding filtering tank, the scraper 553 is pushed to reset, the openable cover plate 556 is closed, and the primary filtering tank or the secondary filtering tank is connected with the old slurry tank 51 for continuous use.

In another technical solution, as shown in fig. 3 and 5, in the slurry circulating system for underground diaphragm wall construction, a filler device 13 is further disposed on the old slurry tank 51, the filler device 13 includes a storage tank 131, a feed inlet is disposed at the top of the storage tank 131, the bottom of the storage tank 131 is funnel-shaped, a discharge outlet is disposed at the bottom of the storage tank 131, a pair of flow-limiting chutes 132 with opposite openings is horizontally disposed at the discharge outlet at the bottom of the storage tank 131, a flow-limiting plate 133 capable of sliding in the flow-limiting chutes 132 is inserted in the flow-limiting chutes 132, and the discharge outlet is blocked by the flow-limiting plate 133. The flow limiting plate moves in the flow limiting chute to adjust the size of the discharge hole so as to control the speed and the quantity of discharge.

In another technical solution, as shown in fig. 4, in the slurry circulation system for underground diaphragm wall construction, the height of the scraper in the primary filter tank is less than the distance from the bottom surface in the primary filter tank to the first slurry hole, and the height of the scraper 553 in the secondary filter tank 55 is less than the distance from the bottom surface in the secondary filter tank 55 to the second slurry hole 552. And each scraper is prevented from blocking the corresponding slurry hole.

In another technical scheme, in the slurry circulating system in the underground continuous wall construction, stirring devices are arranged in the mixed slurry tank and the old slurry tank. The stirring device can be a stirring paddle and is used for uniformly mixing the slurry to ensure the quality of the slurry.

In another technical scheme, in the slurry circulating system in the underground continuous wall construction, valves are arranged on the first water conveying pipe, the return pipe and the second water conveying pipe, and the first water conveying pipe comprises a plurality of first water conveying pipes which are detachably connected. The valves are used for controlling the flow of the fluid in the pipes; the first water conveying pipeline comprises a plurality of first water conveying pipes which are detachably connected, so that the distance between each device can be conveniently adjusted according to construction requirements, and each device can be conveniently detached and maintained.

The recycling method of the slurry circulating system in the underground continuous wall construction based on the invention comprises the following steps:

cleaning a first construction site, splicing a plurality of sections of linear sliding rails 101 and fixing the linear sliding rails on the ground, placing each device in a slurry circulating system on the sliding rails, and splicing and connecting;

step two, starting all the devices for construction, conveying new slurry to a wall construction site according to construction requirements or recycling waste slurry to the old slurry treatment tank 5 for recycling until the construction of the first construction site is finished, and closing all the devices in the slurry circulation system;

step three, cleaning a second construction site, splicing a plurality of sections of sliding tracks in the site and butting the sliding tracks with the sliding track of the first construction site; when the underground continuous walls prepared in the first construction site and the second construction site are horizontally connected, only the linear sliding rails 101 are needed to be spliced with each other; when the underground continuous wall prepared by the first construction site and the second construction site is connected at a certain angle, the arc-shaped sliding rails 102 and the linear sliding rails 101 at the two ends are spliced at the corners of the wall;

fourthly, dismantling a limiting rod on a sliding track on the first construction site, pushing each device of the slurry circulating system to slide on the multi-section sliding track to the second construction site, inserting the limiting rod into a limiting hole at the corresponding position of the first roller on each device, and then constructing;

the moving speed of each device of the mud circulating system on the arc-shaped sliding track 102 is less than that on the linear sliding track 101;

and step five, recovering the multi-section sliding rail on the first construction site for later use.

The recycling method of the slurry circulating system can integrally move the slurry circulating system, and is convenient and quick; the sliding track comprises a straight-line-shaped sliding track and an arc-shaped sliding track which can be spliced, and the requirements of moving routes at different angles can be met.

The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details shown and described herein without departing from the generic concept as defined by the claims and their equivalents.

Claims

1. Mud circulation system in underground continuous wall construction, its characterized in that includes:

2. The mud circulating system of claim 1, wherein the old mud treatment tank comprises a first filtering tank, a second filtering tank and an old mud tank which are sequentially arranged from top to bottom, a plurality of support plates are vertically arranged on the top of the side wall of the old mud tank, a first support plate and a second support plate are horizontally arranged on the support plates from top to bottom, a plurality of second rollers are arranged on the second support plate, the second filtering tank is arranged between the first support plate and the second support plate, the first filtering tank is positioned on the first support plate, one side wall of the first filtering tank and one side wall of the second filtering tank are both provided with openable cover plates, the other side wall of the first filtering tank opposite to one side wall of the first filtering tank and the other side wall of the second filtering tank opposite to one side wall of the first filtering tank are respectively provided with a first mud hole and a second mud hole, the mud pump comprises a primary filter tank, a secondary filter tank, scrapers, pulleys, a slurry return pipe and a primary filter tank, wherein the scrapers are vertically arranged in the primary filter tank, the two ends of each scraper are provided with hooks, the free ends of the hooks are provided with the pulleys, the tops of the opposite side walls, fixed to the secondary filter tank, of the primary filter tank are provided with grooves, the pulleys are arranged in the corresponding grooves and can slide in the grooves, the scrapers are arranged on one sides of cover plates, and the slurry pump is communicated with the primary filter tank through the slurry return pipe.

3. The mud circulating system for underground continuous wall construction as claimed in claim 2, wherein the old slurry tank is further provided with a filling device, the filling device comprises a storage tank, the top of the storage tank is provided with a feeding port, the bottom of the storage tank is funnel-shaped, the bottom of the storage tank is provided with a discharging port, the discharging port at the bottom of the storage tank is horizontally provided with a pair of flow-limiting chutes with opposite openings, flow-limiting plates capable of sliding in the flow-limiting chutes are inserted in the flow-limiting chutes, and the flow-limiting plates block the discharging port.

4. The mud circulation system for underground diaphragm wall construction as claimed in claim 2, wherein the height of the scraper in the primary filter tank is less than the distance from the bottom surface of the primary filter tank to the first mud hole, and the height of the scraper in the secondary filter tank is less than the distance from the bottom surface of the secondary filter tank to the second mud hole.

5. The mud circulation system for underground continuous wall construction as claimed in claim 1, wherein a stirring device is provided in each of the mixed mud tank and the old mud tank.

6. The mud circulating system for underground continuous wall construction as claimed in claim 1, wherein valves are disposed on the first water pipe, the return pipe and the second water pipe, and the first water pipe comprises a plurality of first water pipes which are detachably connected.

7. The recycling method of the slurry circulating system is characterized by comprising the following steps of: