CN110886307B

CN110886307B - Pipe well backfill method based on protection of karst water channel

Info

Publication number: CN110886307B
Application number: CN201911088728.3A
Authority: CN
Inventors: 李罡; 李虎; 赵子寅; 胡月; 王鑫; 张晋毅
Original assignee: Jinan Rail Transit Group Co Ltd
Current assignee: Jinan Rail Transit Group Co Ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2021-06-29
Anticipated expiration: 2039-11-08
Also published as: CN110886307A

Abstract

The invention relates to a pipe well backfill method based on a protective karst water channel, which comprises the following steps: step 1: laying a permeable layer with water permeability on the bottom surface of the pipe well; step 2: placing a water stopping bag in the pipe well, wherein the water stopping bag is placed on the water permeable layer; and step 3: filling grout is injected into the water stopping bag, the water stopping bag is expanded to cover the upper surface of the water permeable layer, and the gushing of karst water is blocked; and 4, step 4: the pipe well backfilling method does not damage the flow channel of the karst water, does not influence the water quality of the karst water, and has remarkable social benefit and economic benefit.

Description

Pipe well backfill method based on protection of karst water channel

Technical Field

The invention relates to the technical field of underground construction engineering, in particular to a pipe well backfill method based on a protective karst water channel.

Background

Along with the development of cities, engineering construction is continuously expanded to the underground, the number of the pipe wells excavated in the foundation pit is continuously increased, underground karst water channels can be damaged in the drilling process of the pipe wells, karst water is gushed, the pipe wells are left for a long time, and backfilling plugging is required subsequently, so that the problem that the normal flow of the karst water is not influenced by the backfilling of the pipe wells in the backfilling plugging process becomes one of important problems for spring water protection.

The inventor finds that at present, no related patent is provided at home and abroad for a pipe well plugging solution based on the protection of a karst water channel, and grouting plugging, clay ball backfilling and other schemes are mostly adopted in the actual construction process. The grouting plugging scheme mainly adopts composite double-liquid slurry or cement slurry to directly recharge, and firstly, the water plugging effect is poor, secondly, the quality of underground water is adversely affected, and thirdly, karst water channels are adversely affected; the clay ball backfilling scheme can also cause unrecoverable damage to the karst water channel; in conclusion, the conventional scheme has great influence on the groundwater quantity and the water quality, and can cause unrecoverable damage to the karst water channel, thereby possibly causing irreparable loss to the gushing of spring water.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a pipe well backfilling method based on a protective karst water channel, which can ensure that the quality and the flow of the karst water are not influenced after the pipe well is backfilled, and has remarkable social and economic benefits for protecting the flow channel of the karst water.

In order to achieve the purpose, the invention adopts the following technical scheme:

a pipe well backfill method based on a protective karst water channel comprises the following steps:

step 1: and laying a permeable layer with water permeability on the bottom surface of the pipe well.

Step 2: the water stopping sac is placed in the pipe well and is placed on the water permeable layer.

And step 3: and filling slurry into the water stopping bag, expanding the water stopping bag to cover the upper surface of the water permeable layer, and blocking the gushing of karst water.

And 4, step 4: and pumping water in the pipe well, backfilling a water-resisting material, and backfilling the pipe well.

Furthermore, the permeable layer has multiple layers, and is paved in a layered mode.

Furthermore, in the two adjacent permeable layers, the permeable layer of the lower layer has a water permeability better than that of the upper layer.

Furthermore, the multiple permeable layers are formed by paving graded broken stones, and the grain size of the broken stones is 1cm-4 cm.

Further, stagnant water bag is connected with slip casting pipe and blast pipe, the slip casting pipe is arranged in injecting into to stagnant water bag and fills the thick liquid, the blast pipe is provided with discharge valve for the air in the stagnant water bag of discharging, discharge valve is used for controlling switching on and closing of blast pipe.

Further, the specific steps of step 2 are:

step (1): and opening the exhaust valve, injecting the filling slurry into the water stopping bag by using the grouting pipe, and exhausting air in the water stopping bag through the exhaust pipe.

And (2) closing the exhaust valve, continuously injecting filling slurry into the water stopping bag by using the grouting pipe, and expanding the water stopping bag until the water stopping bag blocks the gushing of karst water.

Further, the filling slurry is cement slurry.

Furthermore, the water stopping bag is made of degradable materials.

Further, in the step 4, the water-resisting material is backfilled until the top surface is level with the ground.

Further, the waterproof material is plain concrete or cohesive soil.

The invention has the beneficial effects that:

1. according to the pipe well backfilling method, the permeable layer is laid on the bottom surface of the pipe well, so that the permeable layer has water permeability and cannot influence the normal flow of the karst water, and therefore the condition that the flow channel of the karst water cannot be irrecoverably damaged when the pipe well is backfilled is ensured.

2. According to the pipe well backfilling method, the water stopping bag is arranged on the permeable layer, and the backfilled water-resisting material and the permeable layer are separated by the water stopping bag, so that the backfilled water-resisting material can be prevented from entering the permeable layer to pollute karst water, meanwhile, the water stopping bag can be prevented from being communicated with the backfilled water-resisting material, the backfilling quality of the pipe well is ensured, and the seepage path of the karst water is prevented from being changed greatly.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic diagram of example 1 of the present invention after completion of step 1;

FIG. 2 is a schematic diagram of example 1 after completion of step 2;

FIG. 3 is a schematic diagram of example 1 after completion of step 3;

FIG. 4 is a schematic diagram of example 1 after completion of step 4;

the water-stop grouting device comprises a pipe well 1, a water permeable layer 2, a water stop bag 3, a grouting pipe 4, an exhaust pipe 5, an exhaust valve 6, cement slurry 7 and a water-stop material 8.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

As described in the background art, the existing pipe well backfill method can cause adverse effects on the quality of the karst water and irrecoverable damage to a flow channel of the karst water.

In example 1, a pipe well damages an underground karst water channel, and karst water gushing occurs in the pipe well, and a pipe well backfill method based on protection of the karst water channel, as shown in fig. 1 to 4, includes the following steps:

step 1: lay permeable bed 2 in the bottom surface of tube-well 1, the permeable bed has the multilayer, and the layering is laid, and the permeable bed adopts the graded rubble to lay and forms, the particle diameter of graded rubble is 1cm-4cm, and the graded rubble can adopt slice stone, rubble, lump stone or ovum gravel etc. and technical personnel in the field can select one or more rubbles to lay the permeable bed according to actual need, and in the adjacent two-layer permeable bed, the particle diameter of the graded rubble of the permeable bed of lower floor is greater than the particle diameter of the graded rubble of the permeable bed of upper strata, and the permeability of the permeable bed of lower floor is superior to the permeability of the permeable bed of upper strata. The permeable bed reduces by lower supreme water permeability in proper order, is favorable to preventing the upward infiltration of karst water and then gushes out, has guaranteed the shutoff effect.

The thickness of the permeable layer is determined by calculation according to the water inflow and the water head height of the karst water, and the thickness of the permeable layer cannot influence the permeation efficiency of the karst water. The calculation process is only required to adopt the existing theoretical calculation, and the specific calculation method is not described in detail here.

Step 2: built-in stagnant water bag 3 of going into in the foundation ditch, stagnant water bag places on the upper surface on permeable bed, stagnant water bag adopts the degradable material to make, the degradable material adopts biodegradable material, makes like straw, paper products, starch etc. and stagnant water bag is connected with slip casting pipe 4 and blast pipe 5, be provided with discharge valve 6 on the blast pipe.

And step 3: open discharge valve, be connected slip casting pipe and outside slip casting equipment, pour into the packing thick liquid into through slip casting equipment and slip casting pipe to stagnant water bag, the packing thick liquid adopt current cement thick liquid can, pour into the cement thick liquid into stagnant water bag, the inside air of inside passes through the blast pipe and discharges, and the slip casting settlement time is after discharging the air in stagnant water bag completely, closes discharge valve, continues to pour into cement thick liquid 7 into stagnant water bag, and stagnant water bag inflation is until stagnant water bag covers the upper surface on permeable bed to carry out the shutoff with the gushing of karst water.

And 4, step 4: and after the water stopping bag completes the plugging of the karst water, backfilling a water stopping material 8 in the pipe well, wherein the water stopping material can be green and environment-friendly water stopping materials such as plain concrete or cohesive soil, and the backfilling material is backfilled until the top surface of the backfilling material is flush with the external ground.

By adopting the pipe well backfilling method of the embodiment, the permeable layer is laid on the bottom surface of the pipe well, so that the permeable layer has water permeability and cannot influence the normal flow of the karst water, and therefore, the irrecoverable damage to a flow channel of the karst water cannot be caused when the pipe well is backfilled.

Meanwhile, the water stopping bag is arranged on the permeable layer, the backfilled water-proof material and the permeable layer are separated by the water stopping bag, the phenomenon that the backfilled water-proof material enters the permeable layer to pollute karst water can be avoided, meanwhile, the water stopping bag can avoid the communication between the karst water and the backfilled water-proof material, the backfilling quality of the pipe well is ensured, and the seepage path of the karst water is ensured not to be greatly changed.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims

1. A pipe well backfill method based on a protective karst water channel is characterized by comprising the following steps:

step 1: laying a permeable layer with water permeability on the bottom surface of the pipe well, wherein the permeable layer is provided with a plurality of layers, layered laying is adopted during laying, and the water permeability of the permeable layer on the lower layer is superior to that of the permeable layer on the upper layer in the two adjacent permeable layers;

step 2: the method comprises the following steps that a water stopping bag is placed in a pipe well and placed on a permeable layer, the water stopping bag is connected with a grouting pipe and an exhaust pipe, the grouting pipe is used for injecting filling slurry into the water stopping bag, the exhaust pipe is provided with an exhaust valve used for exhausting air in the water stopping bag, and the exhaust valve is used for controlling the exhaust pipe to be switched on and off;

the specific steps of the step 2 are as follows:

step (1): opening an exhaust valve, injecting filling slurry into the water stopping bag by using a grouting pipe, and exhausting air in the water stopping bag through an exhaust pipe;

closing the exhaust valve, continuously injecting filling slurry into the water stopping bag by using the grouting pipe, and expanding the water stopping bag until the water stopping bag blocks the gushing of karst water;

and step 3: filling grout is injected into the water stopping bag, the water stopping bag is expanded to cover the upper surface of the water permeable layer, and the gushing of karst water is blocked;

2. The pipe well backfill method based on the protection karst water channel according to the claim 1, characterized in that, the multiple permeable layers are laid by graded crushed stone with the grain size of 1cm-4 cm.

3. The method for backfilling a pipe well based on the protection of a karst water channel according to claim 1, wherein the filling slurry is a cement slurry.

4. The pipe well backfill method based on the protection karst water channel, according to the claim 1, characterized in that the water stop bag is made of degradable material.

5. The pipe well backfill method based on the karst water channel protection, according to the claim 1, characterized in that in the step 4, the water-resisting material is backfilled until the top surface is flush with the ground surface.

6. The pipe well backfill method based on the karst water channel protection, according to the claim 1, characterized in that the water-proof material adopts plain concrete or cohesive soil.