CN103821469B

CN103821469B - Slurry control method for underground slurry wall construction at high-powder-clay-content stratum

Info

Publication number: CN103821469B
Application number: CN201410095787.4A
Authority: CN
Inventors: 童耀; 焦家训; 曹莉; 张玉莉; 高明巧; 罗会东
Original assignee: GEZHOUBA GROUP FOUNDATION ENGINEERING Co Ltd
Current assignee: GEZHOUBA GROUP FOUNDATION ENGINEERING Co Ltd
Priority date: 2014-03-17
Filing date: 2014-03-17
Publication date: 2015-01-28
Anticipated expiration: 2034-03-17
Also published as: CN103821469A

Abstract

A slurry control method for an underground slurry wall construction at a high-powder-clay-content stratum includes the following steps that (1), particles which are larger than 5 mm in particle size in slurry are removed; (2), fine sand which is larger than 0.06 mm in particle size is separated from the slurry; (3), powder clay particles which are larger than 5 micrometers in particle size are separated from the slurry to obtain treated slurry; (4), the purified and treated slurry is delivered to a groove hole which is grooved through milling to perform grooving slurry supplementation, and therefore slurry recycling is achieved. The problem that the powder and fine particles can not be purified and separated can be solved through the slurry control method for the underground slurry wall construction at the high-powder-clay-content stratum, and harmless and continuous standard-reaching treatment control over slurry performance in the high-powder-clay-content stratum can be effectively and continuously performed.

Description

A kind of high powder clay content stratum diaphragm wall mud control method

Technical field

The mud that the present invention relates in underground continuous wall milling grooving process controls, a kind of particularly innoxious controls up to par method of controllability of high powder clay content stratum diaphragm wall pore-creating mud property.

Background technology

Along with the development of slotted eye drilling technology, more and more higher to the requirement of mud property.At present, in underground continuous wall milling grooving process, often run into the situation of formation geology complicated condition, such as, rock stratum is respectively argillic horizon from top to down, completely decomposed argillaceous slate layer, severely-weathered slate layer and middle wind slap layer, with overlying strata in hydraulic pressure milling grooving process, a large amount of powder fine graineds enters into slurries, when in engineering stratum, the thin clay content of powder is higher, in slotted eye milling boring procedure, powder fine grained cannot be separated by conventional purifying station, the proportion of slurries, viscosity can constantly rise, especially at high powder, in the milling boring trenching construction process on high clay content stratum, a large amount of powder fine grained enters into mud in the milling shattering process of milling head to ground, and powder fine grained cannot be screened out by traditional purifying station sand removing machine, slurry viscosity, proportion constantly raises along with the increase of drilling depth, affect milling head and evolution device normally works, until slurries can not meet construction requirement and discard, thus increase mud conditioning expense and the pollution to environment.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of high powder clay content stratum diaphragm wall mud control method, can solve powder fine grained cannot the problem of purification separation, continuously and effectively can carry out innoxious continuous process up to standard to the milling grooving mud property in high powder clay content stratum and control.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of high powder clay content stratum diaphragm wall mud control method, and the method comprises the following steps:

1) when milling is holed, by the slurry transportation at the bottom of slotted eye hole to the desander of ground mud cleaning system, remove particle diameter in mud and be greater than the particle of 5mm;

2) mud through step 1) process is sent into cyclone sand removing machine, be separated particle diameter in mud and be greater than the fine sand of 0.06mm;

3) will through step 2) mud that processes sends into mud centrifuge, and be separated the powder clay that the particle diameter in mud is greater than 5 μm, obtain mud after treatment;

4) in the slotted eye of the slurry transportation after step 3) process to milling being holed, carry out pore-creating mud and supplement, realize mud circulation and use.

In step 1), desander is vibrosieve.

Step 2) in, sent into the cyclone sand removing machine of multiple stage parallel connection by flow distributor through the mud of step 1) process.

In step 3), through step 2) mud that processes sends into the mud centrifuge of multiple stage parallel connection by flow distributor.

The method also comprises: again send into after mud centrifuge carries out partial circulating purified treatment after being mixed by the mud of the mud after step 3) process and outside brand-new or recovery and send in slotted eye again, namely partial circulating purified treatment is formed to reclaiming slurries in mud pit, harmful powder clay can be removed in time, control mud property.

For ensureing the quick, efficient of diaphragm wall pore-creating mud purification process, the mud capacity of cleaning equipment at different levels should match with the slush pump discharge capacity in milling head, and cell arrangement matching running can be adopted accordingly, to mud in slotted eye with brill process continuously, synchronously carry out with normal milling grooving of holing, make the performance parameters such as the slurry specific gravity in grooving process, viscosity meet construction requirement all the time.When mud property is stablized, the working cell of centrifuge in (closedown) mud cleaning system suitably can be reduced according to actual conditions, to reduce equipment loss.

The present invention adopts the method for physical treatment, to remove harmful powder clay in mud and mud property controllable fast for technique core, pore-creating mud after this PROCESS FOR TREATMENT, the proportion of its slurries, the performance indications such as viscosity are well positioned to meet the requirement of diaphragm wall making hole construction, compared with traditional handicraft, not only treatment effeciency is high, and achieve and do not land continuous process up to standard to mud in slotted eye in milling grooving process, avoid the generation of discarded slurries to greatest extent, reach solution high in the diaphragm wall mud purification disposal cost of high powder clay content stratum, weak effect, discarded amount is large, the goal of the invention of the problems such as environment pollution is serious.

Accompanying drawing explanation

Below in conjunction with drawings and Examples, the invention will be further described:

Fig. 1 is process flow diagram of the present invention;

Fig. 2 is the layout schematic diagram of mud cleaning system of the present invention.

Detailed description of the invention

Embodiment

With certain engineering construction of diaphragm wall example domestic, this project complex geologic conditions, is respectively 0 ~ 9m argillic horizon from top to down; 4 ~ 14m completely decomposed argillaceous slate layer, the severely-weathered slate layer of 10 ~ 16m, wind slap layer in 3 ~ 5m, with overlying strata in hydraulic pressure milling grooving process, a large amount of powder fine graineds enters into slurries, the slurries that can again utilize cannot be isolated by hydraulic pressure milling clarifier, because its slurry specific gravity, viscosity constantly increase in grooving process, when proportion, viscosity exceed requirement, mud in hole must be discarded, again change fresh mud, which produces a large amount of useless slurries (becoming 2 ~ 3 times that body of wall is long-pending).Effectively can be separated the powder fine grained in pore-creating mud by the present invention, make the performance indications such as slurry specific gravity, viscosity meet construction and code requirement all the time.

Concrete steps following (as shown in Figure 1, the layout schematic diagram of mud cleaning system is as shown in Figure 2 for process flow diagram):

1) in hydraulic pressure milling groove milling process, by milling wheel, the soil body is broken, broken rock quarrel is carried into mud cleaner by mud in slotted eye 5, now mud balance is at 1.35 ~ 1.45g/cm3, viscosity was at 40 ~ 50 seconds, and sand content is entered speed and caused size performance parameter fluctuation larger on the different stratum of 8% ~ 20%(and milling);

2) kukersite quarrel mud is transported to the screen cloth of vibrosieve by clarifier feed pipe, and the particle being greater than 5mm is screened out.

3) the mud particle thing being less than 5mm enters into flow distributor, then flowed into the main tank of each self-corresponding cyclone sand removing machine by flow distributor by tube connector, mud in main tank is drawn to cyclone separator by pump, the fine sand (being greater than 0.06mm particle) be separated falls vibration dehydration mesh screen from cyclone bottom outlet (flexible pipe), and fine sand is discharged after dehydration.Mud after process is pooled in pans through cyclone spout hole, then transfer to outer slurry tank 1 thus, still containing a large amount of powder fine grained in the mud now after process, slurry specific gravity is appointed and is maintained more than 1.35, viscosity (geneva) maintains more than 37S, and sand content maintains 4%; The quantity of cyclone sand removing machine is two.

4) mud in outer slurry tank 1 delivers to two horizontal spiral discharge sedimentation centrifuges in parallel by pump and flow distributor, mud adds in spiral by feed pipe, discharge opening again in spiral cylinder enters rotary drum, under the influence of centrifugal force, the solid phase particles that proportion is larger is heavy to be attached on rotatory drum wall, form an annular solid-phase layer, helical conveyor is under the effect of differential mechanism, solid phase sediment (being greater than 5 μm of particles) after dehydration is released from the slag notch of circular cone rotary drum, the mud that proportion is lighter overflows from overfall, so continuously work, reach and be continuously separated the fine grain object of powder in mud.

5) mud is after purified treatment, is directly delivered in slotted eye 5 by Pulp pump 6, with the mud extracted out bottom supplemental tank section, reaches mud circulation application target.

Again sending into after mud centrifuge carries out partial circulating purified treatment after the mud of the mud after step 4) process and outside brand-new or recovery can being mixed sends in slotted eye 5 again, namely partial circulating purified treatment is formed to reclaiming slurries in mud pit, the thin clay of harmful powder can be removed in time, control mud property.

Claims

1. a high powder clay content stratum diaphragm wall mud control method, is characterized in that the method comprises the following steps:

1) when milling, by the slurry transportation at the bottom of slotted eye (5) hole to the desander (3) of ground mud cleaning system, remove particle diameter in mud and be greater than the particle of 5mm;

2) mud through step 1) process is sent into cyclone sand removing machine (2), be separated particle diameter in mud and be greater than the fine sand of 0.06mm;

3) will through step 2) mud that processes sends into horizontal spiral discharge sedimentation centrifuge (4), mud adds in spiral by feed pipe, discharge opening again in spiral cylinder enters rotary drum, under the influence of centrifugal force, the solid phase particles that proportion is larger is heavy to be attached on rotatory drum wall, form an annular solid-phase layer, helical conveyor is under the effect of differential mechanism, solid phase sediment after dehydration is released from the slag notch of circular cone rotary drum, the mud that proportion is lighter overflows from overfall, so continuously work, reach the object that the particle diameter be continuously separated in mud is greater than the powder clay of 5 μm,

4) by the slurry transportation after step 3) process in the slotted eye (5) of milling, carry out grooving mud supplement, realize mud circulation use;

Step 2) in, sent into the cyclone sand removing machine (2) of multiple stage parallel connection by flow distributor through the mud of step 1) process;

In step 3), through step 2) mud that processes sends into the horizontal spiral discharge sedimentation centrifuge (4) of multiple stage parallel connection by flow distributor;

In step 1), desander (3) is vibrosieve;

Again send into after horizontal spiral discharge sedimentation centrifuge (4) carries out partial circulating purified treatment after the mud of the mud after step 3) process and outside brand-new or recovery is mixed and send into again in slotted eye (5).