CN111648347A

CN111648347A - Drainage and grouting comprehensive pipe body and construction method thereof

Info

Publication number: CN111648347A
Application number: CN202010528553.XA
Authority: CN
Inventors: 周兴顺; 李钰春; 庞锋; 钱晓彤; 赵星宇
Original assignee: China Design Group Co Ltd
Current assignee: China Design Group Co Ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2020-09-11

Abstract

The invention relates to a drainage and grouting integrated pipe body, which comprises a grouting pipe, a geomembrane and a conical pipe head; the pipe wall of the grouting pipe is provided with a water inlet, the lower part of the grouting pipe is provided with a conical pipe head, and the top of the grouting pipe is provided with an upper pulling hole with a large aperture; the outer wall of the grouting pipe during drainage is coated with a degradable geomembrane which is made of polylactic acid and has a reverse filtration function, the lower part of the grouting pipe is arranged in a sand cushion layer, one end of a drainage pipe is connected with a vacuum water pump, and the other end of the drainage pipe is coated with a layer of reverse filtration geomembrane and is arranged in the sand cushion layer; the top of the grouting pipe during grouting is connected with the pressure valve and the conveying pipe through a buckle. The invention has the beneficial effects that: the grouting pipe integrates water absorption, water guiding and grouting solidification through the filtering and degrading effects of the reverse filtering geomembrane, is green and environment-friendly, and enriches the drainage solidification treatment method in the waste soil backfilling utilization engineering; the grouting pipe is pulled up after the construction is completed, so that the repeated utilization is realized, and meanwhile, the reverse filtering geomembrane is made of a polylactic acid material, is a degradable material and has no damage to the environment.

Description

Drainage and grouting comprehensive pipe body and construction method thereof

Technical Field

The invention relates to a pipe body for accelerating the drainage of backfilled waste soil and a reinforcing method thereof, in particular to a drainage and grouting integrated comprehensive pipe body and a reinforcing method thereof, which are suitable for a drainage solidification project of high-water-content waste soil in a pit backfilling project in a foundation treatment process.

Background

Since the 20 th century, the urbanization process of China has been rapidly promoted, and the construction of each infrastructure has been vigorously developed. In the construction process of railways, tunnels, foundation pits and the like, waste soil such as silt soil and the like can be inevitably encountered, engineering construction is difficult to advance due to low strength and limited bearing capacity of the waste soil, and a lot of areas have high outward transportation and stacking difficulty due to environmental protection requirements, so that the waste soil is backfilled into pit sections such as fishponds and the like and then subjected to drainage and solidification treatment, so that the waste soil meets the strength requirement met by a filler, the resource utilization of the waste soil is realized, the smooth advance of construction is facilitated on the one hand, the problem that the waste soil is inexorable on the other hand is solved, and the concept of green and ecological traffic construction is met.

The on-site sludge waste soil mostly has the characteristics of high water content, low strength, poor permeability and the like, and can not meet the strength requirement of the filler on the specification, so the sludge waste soil needs to be cured. The moisture content of the sludge must be reduced before the solidification process. The most common existing sludge waste soil drainage treatment methods are a natural drying method, a drainage consolidation method, a high vacuum densification method, a dynamic drainage consolidation method and the like.

The natural drying method has less manpower and material resources, effectively utilizes the natural drying effect, but has lower drainage rate, overlong drainage treatment time, limited drainage depth, only reduced water content of surface soft soil and limited drainage effect on deep soft soil; the conventional methods such as drainage consolidation require that a plastic drainage plate or a sand well or the like vertical drainage body is drilled in the foundation and pre-pressed by applying an external load. Compared with a natural airing method, the method has the advantages that the drainage time is short, the drainage effect is obvious, the water content and the pore ratio of the sludge can be reduced in a short period, and the drainage treatment effect on the surface layer and the deep layer of the soft soil is good, but the arranged vertical drainage bodies are all made of disposable materials and cannot be recycled, so that the environmental pollution and the resource waste are caused; external load needs to be accomplished through applying vacuum load or piling load, and the load of no matter which kind of form all need invest a large amount of manpower and materials and can realize to lead to the cost higher.

In the existing drainage solidification engineering of high-water-content waste soil of backfill engineering, although a natural airing method reduces the input of manpower and material resources and effectively utilizes the action of sun drying and air drying in the nature, the treatment time is too long during drainage, the influence depth is limited, and only the water content of surface soft soil can be reduced; although the water content of the soil body can be reduced in a short period by the traditional methods such as a drainage consolidation method and the like, a large amount of manpower and material resources are input due to manual prepressing, and the vertical drainage bodies are mostly petrochemical derivative industrial products, so that the vertical drainage bodies are remained in soft soil to cause damage and waste to the environment and resources.

After the water content of the soil body is reduced, the curing agent is generally manually thrown or stirred by a powerful stirrer while spraying to cure the waste soil.

In summary, drainage and solidification engineering of the sludge waste soil are often performed separately, and drainage efficiency is low or construction cost is high, so that a green construction technology which does not need to apply external load, is relatively economical in construction cost and integrates soil body drainage and solidification is urgently needed according to the current actual situation and technical conditions, and the backfilled soil body is effectively and efficiently subjected to drainage and solidification treatment.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a drainage and grouting integrated comprehensive pipe body and a construction method thereof, which shorten drainage time, reduce construction cost, and have degradable filter membranes around the comprehensive pipe body and no influence on the environment.

The drainage and grouting comprehensive pipe body comprises a grouting pipe, a geomembrane and a conical pipe head; the pipe wall of the grouting pipe is provided with a water inlet, the lower part of the grouting pipe is provided with a conical pipe head, and the top of the grouting pipe is provided with an upper pulling hole with a large aperture; the outer wall of the grouting pipe during drainage is coated with a degradable geomembrane which is made of polylactic acid and has a reverse filtration function, the lower part of the grouting pipe is arranged in a sand cushion layer, one end of a drainage pipe is connected with a vacuum water pump, and the other end of the drainage pipe is coated with a layer of reverse filtration geomembrane and is arranged in the sand cushion layer; the top of the grouting pipe during grouting is connected with the pressure valve and the conveying pipe through a buckle.

Through inserting the slip casting pipe in the abandonment soil of high moisture content, reduce the drainage route for drainage rate, the water in the abandonment soil permeates geotechnological filter membrane under no pre-compaction effect, in the inlet opening gets into the slip casting pipe, deposits to slip casting socle portion, and the rethread inlet opening gets into the sand cushion layer, and the water in with the sand cushion layer is discharged through vacuum suction pump and drain pipe at last. The curing agent is conveyed into the grouting pipe through the conveying pipe, then the curing agent is uniformly distributed in a soil body through the water inlet hole, the grouting pipe is pulled up and recycled, and a powerful stirring head is used for stirring, so that the efficient green treatment effect of the waste soil after drainage and curing is achieved.

Preferably, the method comprises the following steps: the grouting pipe and the conical pipe head can be made of PVC, PE pipe and other plastic materials or stainless steel materials.

Preferably, the method comprises the following steps: the geomembrane adopts manual binding or hot rolling encapsulation.

Preferably, the method comprises the following steps: the drain pipe adopts PVC steel wire hose.

Preferably, the method comprises the following steps: an upper pulling pin is arranged in the upper pulling hole and connected with the hemp rope.

The construction method of the drainage and grouting comprehensive pipe body comprises the following steps:

s1, paving a sand cushion layer with the thickness of 50cm at the bottom of the pit on the ground surface, embedding a drain pipe with one end wrapped with a geomembrane in the sand cushion layer, and backfilling sludge waste soil into the pit;

s2, manufacturing a comprehensive pipe with a corresponding depth according to the drainage and curing depth, and lofting according to the field condition;

s3, controlling the arrangement distance of the comprehensive pipes to be 1.5-2.0 m, and pressing the comprehensive pipes into the soft soil to be treated in a manual insertion mode; reserving a certain distance to enable an upper pulling hole at the top of the grouting pipe to be reserved on the ground in the process of pressing the comprehensive pipe into the soft soil;

s4, starting a vacuum water pump, monitoring the change of the water content in the soil, and stopping pumping water after the solidification requirement is met;

s5, connecting the top of the comprehensive pipe with a material conveying pipe, injecting a curing agent into the grouting pipe, and uniformly arranging the curing agent into the backfill soil through the water inlet;

and S6, after the distributing of the curing agent is finished, inserting an upper pulling pin into the upper pulling hole, pulling up and recycling the grouting pipe by adopting a hemp rope, and stirring by utilizing a strong stirring head to finish the construction of firstly draining and then curing the backfilled waste soil in the area.

Preferably, the method comprises the following steps: in step S5, the pressure valve value at the joint is observed at regular time during grouting, and if the pressure value exceeds a threshold value, partial pressure is released.

The invention has the beneficial effects that:

1) the grouting pipe integrates water absorption, water guiding and grouting solidification through the filtering and degrading effects of the reverse filtering geomembrane, is green and environment-friendly, and enriches the drainage solidification treatment method in the waste soil backfilling utilization engineering.

2) The grouting pipe is pulled up after the construction is completed, so that the repeated utilization is realized, and meanwhile, the reverse filtering geomembrane is made of a polylactic acid material, is a degradable material and has no damage to the environment.

Drawings

FIG. 1 is a schematic structural view of a drainage and grouting integrated pipe body;

FIG. 2 is a sectional view taken along line A-A of the integrated drainage and grouting pipe of FIG. 1;

FIG. 3 is a schematic view of the drainage operation of the drainage and grouting integrated pipe body;

FIG. 4 is a construction process diagram of a drainage and grouting integrated pipe body;

FIG. 5 is a schematic diagram of the drainage and grouting integrated pipe after the completion of the driving;

FIG. 6 is a detailed view of the connection between the grouting pipe and the conveying pipe.

Description of reference numerals: 1-grouting pipe; 2-a geotechnical filter membrane; 3-buckling; 4-a drain pipe; 5-a material conveying pipe; 6-water inlet; 7-a sand cushion layer; 8-vacuum water pump; 9-a conical tube head; 10-pulling up the hole; 11-pulling up the pin; 12-hemp rope; 13-a pressure valve; 14-a curing agent; 15-weaving cloth; 16-strong stirring head.

Detailed Description

The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

The drainage and grouting integrated pipe body and the construction method thereof have the characteristics of simplicity in construction, low later maintenance requirement, capability of being recycled, environmental friendliness and the like. The method specifically comprises the steps of manufacturing and constructing the drainage and grouting comprehensive pipe body, as shown in figure 1, firstly manufacturing the drainage and grouting comprehensive pipe body:

and S1, manufacturing a vertical grouting pipe. PVC pipes with the outer diameter of 20cm and the inner diameter of 18cm are selected, and the length is 2.5 m. An electric drill with the diameter of 3mm is manually adopted to open a water inlet hole 6 on the electric drill, and the opening rate is not less than 5 percent; an upper pulling hole 10 is formed at a position 5cm away from the top of the PVC pipe by a drill bit with the diameter of 8 mm.

And S2, encapsulating the geomembrane filter membrane 2. By equivalent aperture O₉₅And (3) encapsulating the grouting pipe 1 by the geomembrane 2 with the thickness less than 0.075mm, and sealing the grouting pipe by adopting a manual sewing or hot rolling bonding mode.

S3, inserting the PVC taper pipe head 9 with the connector diameter of 18cm into the lower part of the grouting pipe 1, and fixing by hot rolling glue.

After the drainage and grouting integrated pipe is manufactured into a plurality of pipes, drainage and solidification construction of backfilling waste soil is carried out, and the arrangement is mainly shown in fig. 3. Selecting a certain fishpond backfilled by waste sludge, wherein the average depth of the sludge in the fishpond is 2.0m, the water content of a soil body is 80%, the bearing capacity is insufficient to meet the requirements of pedestrian movement, and a sand cushion layer with the thickness of 50cm is paved at the bottom of the fishpond before backfilling.

S1, laying a layer of woven fabric on the silt soft soil, lofting the woven fabric 15, and designing the drainage and grouting comprehensive pipe to have the soil penetration depth of 2.0m and the spacing of 1.75 m.

And S2, cutting the part to be inserted into the grouting pipe through scissors to break the woven cloth 15, wherein the opening length is not more than 10 cm. And vertically pressing the grouting pipe 1 into the soft soil to be treated. And stopping pressing the grouting pipe 1 when the distance between the grouting pipe and the mud surface is 20cm in the soft soil pressing process.

And S3, starting the vacuum water pump 8, monitoring the water content condition of the soil body at intervals, and stopping pumping water after the solidification requirement is met.

S4, connecting the material conveying pipe 5 and the grouting pipe 1, conveying the prepared curing agent 14 into the grouting pipe 1 through background feeding, and uniformly arranging the curing agent into backfill soil through grouting pipe wall holes. And (3) regularly observing the numerical value of the pressure valve 13 at the joint in the grouting process, and releasing partial pressure if the numerical value exceeds a threshold value.

S5, after the distributing of the curing agent is finished, an upper pulling pin 11 with the diameter of 6mm is inserted into the upper pulling hole 10, the grouting pipe 1 is pulled upwards and recycled by adopting a hemp rope 12, and the grouting pipe is stirred by utilizing a strong stirring head 16, so that the first drainage and then curing of the backfilled waste soil in the area are finished.

The arrangement schematic diagram of the drainage grouting comprehensive pipe for treating the waste backfill soil is shown in fig. 5, and the comprehensive pipe is uniformly arranged in the backfill soil.

Claims

1. The utility model provides a body is synthesized in drainage slip casting which characterized in that: comprises a grouting pipe (1), a geomembrane filter membrane (2) and a conical pipe head (9); the pipe wall of the grouting pipe (1) is provided with a water inlet hole (6), the lower part of the grouting pipe (1) is provided with a conical pipe head (9), and the top of the grouting pipe (1) is provided with an upper pulling hole (10); the outer wall of the grouting pipe (1) during drainage is coated with a degradable geomembrane (2) which is made of polylactic acid and has a reverse filtration function, the lower part of the grouting pipe (1) is arranged in a sand cushion layer (7), one end of the drainage pipe (4) is connected with a vacuum water pump (8), and the other end of the drainage pipe is coated with a reverse filtration geomembrane and is arranged in the sand cushion layer (7); the top of the grouting pipe (1) during grouting is connected with a pressure valve (13) and a material conveying pipe (5) through a buckle (3).

2. The integrated pipe body for water drainage and grouting according to claim 1, characterized in that: the grouting pipe (1) and the conical pipe head (9) are made of plastic materials or stainless steel materials.

3. The integrated pipe body for water drainage and grouting according to claim 1, characterized in that: the geomembrane (2) adopts manual binding or hot rolling encapsulation.

4. The integrated pipe body for water drainage and grouting according to claim 1, characterized in that: the drain pipe (4) adopts a PVC steel wire hose.

5. The integrated pipe body for water drainage and grouting according to claim 1, characterized in that: an upper pulling pin (11) is arranged in the upper pulling hole (10), and the upper pulling pin (11) is connected with a hemp rope (12).

6. A construction method of a drainage and grouting integrated pipe body as claimed in claim 1, comprising the steps of:

s1, paving a sand cushion layer (7) at the bottom of the pit on the ground surface, embedding a drain pipe (4) with one end wrapped with a geomembrane (2) in the sand cushion layer (7), and backfilling sludge waste soil into the pit;

s2, manufacturing a comprehensive pipe with a corresponding depth according to the drainage and curing depth, and lofting;

s3, controlling the arrangement distance of the comprehensive pipes to be 1.5-2.0 m, and pressing the comprehensive pipes into the soft soil to be treated in a manual insertion mode; in the process that the comprehensive pipe is pressed into the soft soil, a certain distance is reserved to enable an upper pulling hole (10) at the top of the grouting pipe (1) to be reserved on the ground;

s4, starting a vacuum water pump (8), monitoring the change of the water content in the soil, and stopping pumping water after the solidification requirement is met;

s5, connecting the top of the comprehensive pipe with a material conveying pipe (5), injecting a curing agent (14) into the grouting pipe (1), and uniformly arranging the curing agent into backfill soil through a water inlet (6);

s6, after the distributing of the curing agent is finished, an upper pulling pin (11) is inserted into an upper pulling hole (10), the grouting pipe (1) is pulled upwards and recovered by a hemp rope (12), and is stirred by a strong stirring head (16), so that the construction of firstly draining water and then curing backfilling waste soil in the area is finished.

7. The construction method of the drainage and grouting comprehensive pipe body as claimed in claim 6, wherein: in step S5, the value of the pressure valve (13) at the joint is observed at regular time during grouting, and if the value exceeds a threshold value, partial pressure is released.