阅读说明：本技术 一种反冲气防淤堵的复合式排水板 (Composite type drain board for preventing back flushing gas from clogging ) 是由 颉伟 李玉灿 董天林 娄云雷 刘云忠 于 2021-10-28 设计创作，主要内容包括：本发明公开了一种反冲气防淤堵的复合式排水板,它包括外层滤膜、内层滤膜、纤维絮体夹层及排水板板芯,本发明采用将纤维絮体夹层填充于外层滤膜及内层滤膜之间构成复合透气板,并将复合透气板分别覆盖在排水板板芯的正反两个面上,构成全新结构的、可透气的复合式排水板。在应用过程中,采用真空预压排水与正压反冲清除淤堵相交替的工艺,克服了排水过程中软土淤堵的问题。采用薄板冲压而成的波纹板作为排水板板芯,提高排水板的刚性,解决排水板弯折变形的问题。本发明具有结构简单,使用便捷,排水效率高的优点。(The invention discloses a composite drain board for preventing back flushing gas from clogging, which comprises an outer filter membrane, an inner filter membrane, a fiber floc interlayer and a drain board core. In the application process, a process of alternating vacuum preloading drainage and positive pressure recoil cleaning clogging is adopted, so that the problem of soft soil clogging in the drainage process is solved. The corrugated plate formed by punching the thin plate is used as the core of the drainage plate, so that the rigidity of the drainage plate is improved, and the problem of bending deformation of the drainage plate is solved. The invention has the advantages of simple structure, convenient use and high drainage efficiency.)

1. The composite drain board is characterized by comprising an outer filter membrane (1), an inner filter membrane (2), a fiber floc interlayer (3) and a drain board core (4), wherein the outer filter membrane (1) and the inner filter membrane (2) are parallel plate-shaped pieces, and the fiber floc interlayer (3) is filled between the outer filter membrane (1) and the inner filter membrane (2) to form a composite breathable board;

the drainage plate core (4) is a corrugated plate formed by stamping a thin plate;

the two composite air permeable plates are respectively covered on the front surface and the back surface of the drainage plate core (4), and the two composite air permeable plates are respectively bonded on the peak tops and the valley bottoms of the corrugations of the drainage plate core (4) through the inner filter membrane (2).

2. A composite water drainage plate with backflushing gas anti-clogging function as claimed in claim 1, wherein the wave form of the corrugated plate on the water drainage plate core (4) is rectangular wave or arc wave.

3. A composite water drainage plate with backflushing gas anti-clogging function as claimed in claim 1, wherein the space enclosed by the grooves between two adjacent waves on the corrugated plate of the water drainage plate core (4) and the inner filter membrane (2) forms a water drainage channel or a backflushing gas channel.

4. A combined type drain board for backflushing gas and preventing silting according to claim 1, wherein the outer filter membrane (1) and the inner filter membrane (2) are both breathable membranes made of non-woven fabric materials.

5. A backflushing gas anti-fouling composite drain board according to claim 1, wherein the fibrous batt interlayer (3) is of a porous fibrous structure made of polypropylene material.

Technical Field

The invention relates to soft foundation treatment or foundation pit dewatering construction in the technical field of constructional engineering, in particular to a combined type drainage plate for preventing clogging by backflushing gas.

Background

The vacuum preloading method is the most common and economic soft foundation consolidation treatment technology for rapidly treating silt soil in geotechnical engineering at present. Through the vertical drainage device inserted in the sludge, the moisture in the sludge is discharged by utilizing the vacuum negative pressure principle, and the soil is reinforced into foundation soil with certain strength and bearing capacity. The drainage device which is most widely applied in the prior art is a plastic drainage plate which has the advantages of low manufacturing cost, quick construction and good water permeability. The method has the advantages that the sludge has the characteristics of high water content, low permeability and flowing plastic flow, the problems that the sludge is difficult to dewater and the sludge around the drainage plate is blocked frequently occur in the sludge soil treatment process by the vacuum preloading method, so that the drainage effect of the plastic drainage plate is inevitably weakened, on one hand, the sludge soil particles near the drainage plate are directionally moved under the vacuum pressure to cause that fine particle soil is gradually gathered around the drainage plate to form a tight soil body with low permeability, on the other hand, part of the fine particle sludge blocks the fiber mesh pores of the filter membrane to cause smearing effect, and on the other hand, some sludge even enters the channel of the plate core through the filter membrane of the drainage plate to cause that the drainage channel is reduced. In addition, the plastic drainage plate is bent and twisted along with the compression and settlement of silt soil in the vacuum preloading process, so that the drainage capacity is greatly reduced. Therefore, the existing single vacuum preloading drainage technology and the structure of the existing plastic drainage plate are changed, the problems of soft soil clogging and bending deformation of the drainage plate in the drainage process are solved, and the drainage efficiency is inevitably improved.

Disclosure of Invention

The invention aims to provide a combined type drainage plate for backflushing gas and preventing clogging aiming at the defects of the prior art. In the application process, the existing single vacuum preloading drainage technology is changed, and the process of alternating vacuum preloading drainage and positive pressure recoil cleaning clogging is adopted, so that the problem of soft soil clogging in the drainage process is solved. The corrugated plate formed by punching the thin plate is used as the core of the drainage plate, so that the rigidity of the drainage plate is improved, and the problem of bending deformation of the drainage plate is solved.

The invention has the drainage advantage of the drainage plate in the vacuum preloading drainage process, simultaneously, in the positive pressure backflushing clogging removing process, a drainage channel formed by a space enclosed by the grooves between two adjacent waveforms on the corrugated plate of the drainage plate core and the inner filter membrane is used as a backflushing air channel, compressed air is conveyed from the backflushing air channel through an air compressor, the compressed air is pressed to the composite air permeable plate by the drainage plate core, particle impurities filled in the fiber floc interlayer, the outer filter membrane and the inner filter membrane and peripheral silt are reversely flushed away from the composite drainage plate, the clogging of the drainage channel and the silt tightly attached to the periphery of the composite drainage plate are removed, and the clogging removing and the vacuum pumping drainage are alternately carried out by positive pressure backflushing, so that the effects of clogging prevention and drainage efficiency improvement are realized.

The specific technical scheme for realizing the purpose of the invention is as follows:

a combined type drain board for preventing clogging of backflushing gas is characterized by comprising an outer filter membrane, an inner filter membrane, a fiber floc interlayer and a drain board core, wherein the outer filter membrane and the inner filter membrane are parallel plate-shaped pieces, and the fiber floc interlayer is filled between the outer filter membrane and the inner filter membrane to form a composite breathable board;

the drainage plate core is a corrugated plate formed by stamping a thin plate;

the two composite air permeable plates are respectively covered on the front surface and the back surface of the drainage plate core, and the two composite air permeable plates are respectively bonded on the peak and the valley of the corrugation of the drainage plate core through the inner filter membrane.

The wave form of the corrugated plate on the drainage plate core is rectangular wave or arc wave.

And the space enclosed by the grooves between two adjacent waves on the corrugated plate of the drainage plate core and the inner filter membrane forms a drainage channel or a back flushing channel.

The outer filter membrane and the inner filter membrane are breathable membranes made of non-woven fabric materials.

The fibrous batting interlayer is a porous fibrous structure made of polypropylene material.

The invention has the beneficial effects that:

(1) on the basis of the advantages of the drainage plate in the prior art, the composite breathable plates are covered on the front surface and the back surface of the drainage plate core, and when the composite breathable plates are used, the composite breathable plates are soaked in a surfactant solution in advance, so that the surface tension of a solid-liquid interface can be reduced in a vacuum preloading process, namely the surface energy between soil particles and water is reduced, and the soil particles are more easily and uniformly dispersed. Furthermore, the surfactant also enables a significant increase in the solubility of organic compounds in the sludge. The design of the fiber floc interlayer can increase the water permeability of the composite drainage plate and prevent the composite drainage plate from being blocked prematurely.

(2) The drainage channel or the backflushing air channel is formed by the space enclosed by the grooves between two adjacent waves and the inner filter membrane on the corrugated plate of the drainage plate core, namely the drainage channel is also used as the backflushing air channel, and under the working condition of positive pressure backflushing and removing the siltation, compressed air applies reverse pressure to the siltation silt outside the inner filter membrane, the fiber floc interlayer and the outer filter membrane outside the channel, so that on one hand, partial soil particles in the fiber floc interlayer are rearranged, on the other hand, particle impurities filled in the inner filter membrane and the outer filter membrane are removed, and the siltation of the drainage channel and the silt attached to the periphery of the composite drainage plate are removed. In the whole process of soft foundation consolidation treatment, the vacuum pumping drainage working condition and the positive pressure recoil cleaning clogging working condition are alternately carried out, so that the effects of clogging prevention and drainage efficiency improvement are realized. Under the working condition of positive pressure back flushing for removing the siltation, a part of conditioner which can improve the drainage permeability of the silt is conveniently added into the silt through the back flushing gas channel, thereby being beneficial to improving the drainage efficiency.

(3) The core of the drainage plate is a corrugated plate formed by stamping a thin plate, so that the overall strength and flexibility of the drainage plate are improved, the drainage plate is not easy to bend and damage along with sludge settlement, the drainage efficiency can be improved, and the service life can be prolonged. Adopt two compound ventilative boards to cover the structure on drain bar core tow sides respectively, effectively block the tiny particle in the silt, prevent that the drain bar from becoming silted up too early stifled, increase its effective function time.

(4) The corrugated plate of the drainage plate core is rectangular wave or arc wave, and can be adjusted according to the design of the construction environment biased to the flow resistance of a drainage channel and the design biased to the rigidity of the drainage plate core. The invention is suitable for mass production and transportation, meets the construction method of the drainage plate in the prior art, and has application and popularization values.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A- -A of FIG. 1;

FIG. 3 is a schematic structural view of a drainage plate core with a rectangular wave shape;

fig. 4 is a structural schematic diagram of the drainage board core with the waveform of arc waves.

Detailed Description

Referring to fig. 1 and 2, the invention comprises an outer filter membrane 1, an inner filter membrane 2, a fiber floc interlayer 3 and a drainage plate core 4.

Referring to fig. 1 and 2, the outer filter membrane 1 and the inner filter membrane 2 are plate-shaped members arranged in parallel, and the fibrous floc interlayer 3 is filled between the outer filter membrane 1 and the inner filter membrane 2 to form a composite air permeable plate.

Referring to fig. 2, 3 and 4, the core 4 of the drainage plate is a corrugated plate formed by punching a thin plate.

Referring to fig. 1 and 2, the two composite air permeable plates are respectively covered on the front surface and the back surface of the drainage plate core 4, and the two composite air permeable plates are respectively bonded on the peak tops and the valley bottoms of the corrugations of the drainage plate core 4 through the inner filter membrane 2.

Referring to fig. 2, 3 and 4, the corrugated plate on the drainage plate core 4 has a rectangular wave or an arc wave.

Referring to fig. 1 and 2, the space enclosed by the grooves between two adjacent waves on the corrugated plate of the drainage plate core 4 and the inner filter membrane 2 forms a drainage channel or a back flushing channel.

Referring to fig. 1 and 2, the outer filter membrane 1 and the inner filter membrane 2 are air permeable membranes made of non-woven fabric materials.

Referring to fig. 1 and 2, the fibrous batt interlayer 3 is a porous fibrous structure made of polypropylene material.

The working process of the invention is as follows:

step 1, referring to fig. 1 and 2, before use, the composite drainage plate is soaked in a selective surfactant solution, for example: immersing hexadecyl trimethyl ammonium chloride at normal temperature for 24 hours to ensure that the solution enters a fiber floc interlayer;

step 2, referring to fig. 1 and 2, inserting the drainage plate soaked with the surfactant in advance into the silt soil to complete system sealing;

step 3, configuring a vacuum pump and an air compressor, arranging a reversing valve between the output ends of the vacuum pump and the air compressor, and connecting the reversing valve with a drainage channel;

step 4, referring to fig. 1 and 2, in the vacuumizing drainage working condition, the vacuum pump is started, the air compressor is closed, the reversing valve is switched to communicate the vacuum pump with the drainage channel, and water in the silt soil is sucked into the drainage channel by the vacuum pump through the outer filter membrane 1, the fiber floc interlayer 3, the inner filter membrane 2 and the drainage plate core 4 and is discharged from the drainage channel;

and 5, referring to the figures 1 and 2, under the working condition of positive pressure back flushing clogging removal, closing the vacuum pump, starting the air compressor, switching a reversing valve to communicate the air compressor and a back flushing air channel, conveying compressed air through the back flushing air channel by the air compressor, pressing the compressed air to the composite breathable plate through the drainage plate core 4, reversely flushing the particle impurities and peripheral sludge filled in the fiber floc interlayer 3, the outer-layer filter membrane 1 and the inner-layer filter membrane 2 away from the composite drainage plate, removing the clogging of the drainage channel and clinging the peripheral sludge of the composite drainage plate, and simultaneously adding ferric chloride solution as a conditioning agent into the silt soil through the back flushing air channel.

And 6, referring to the figure 1, in the whole process of soft foundation consolidation treatment, the vacuum drainage working condition of the step 4 and the positive pressure recoil cleaning clogging working condition of the step 5 are alternately carried out, so that the effects of clogging prevention and drainage efficiency improvement are realized.

Referring to fig. 1, the outer filter membrane 1 and the inner filter membrane 2 are air permeable membranes made of non-woven fabric materials, and the pore size of the filter membranes can be adjusted by the materials of the non-woven fabric materials.

The above description is intended to be illustrative, and not restrictive, of the invention, and all equivalent implementations of the invention are intended to be included within the scope of the claims.