CN112554165B - Permeation monitoring and grouting method for contact surface of composite HDPE (high-density polyethylene) film continuous wall and bedrock - Google Patents
Permeation monitoring and grouting method for contact surface of composite HDPE (high-density polyethylene) film continuous wall and bedrock Download PDFInfo
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- CN112554165B CN112554165B CN202011398808.1A CN202011398808A CN112554165B CN 112554165 B CN112554165 B CN 112554165B CN 202011398808 A CN202011398808 A CN 202011398808A CN 112554165 B CN112554165 B CN 112554165B
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- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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Abstract
The invention provides a permeation monitoring and grouting method for a contact surface of a composite HDPE film underground diaphragm wall and bedrock, and belongs to the field of environmental engineering. According to the permeation monitoring and grouting method for the contact surface of the composite HDPE film underground continuous wall and the bedrock, a grouting loop consisting of a grout conveying pipe, a grouting pipe and a grout return pipe is laid before the HDPE film is arranged below the HDPE film, and after the underground continuous wall is built, fluid is injected into the grouting loop, and the change condition of liquid phase permeation into the contact surface in the grouting pipe is monitored through flow change, so that the permeation monitoring is carried out on the contact surface; wherein, the grouting pipe wall of the part contacting with the bedrock is provided with small grouting holes at intervals. The invention monitors whether liquid phase in the grouting pipe permeates into the contact surface or not by adding grouting liquid or other fluids into the grouting loop and monitoring the permeation condition of the contact surface through the flow difference; and when the situation that the permeation is monitored to occur and grouting is needed, corresponding slurry is injected into the grouting loop to finish grouting and reinforcing of the contact surface.
Description
Technical Field
The invention belongs to the field of environmental engineering, and particularly relates to a permeation monitoring and grouting method for a contact surface of a composite HDPE film continuous wall and bedrock.
Background
The HDPE Membrane has the characteristics of excellent anti-seepage, corrosion resistance, High strength, low cost, environmental protection, no toxicity and the like, is widely applied to the engineering fields of civil engineering, mines, water conservancy, environment and the like, and has the anti-seepage or isolation effect, and the permeation coefficient of the HDPE Membrane with the thickness of 1.5-3 mm is less than 1X10- 12cm/s. Mature heat fusion welds are typically used to lap arbitrary panels, for example, for HDPE films to construct composite underground diaphragm walls.
The underground continuous impervious wall of composite HDPE film diaphragm has been gradually used in the permanent underground water and pollutant separating and permeating control engineering in civil engineering, mine engineering, water conservancy engineering, environment engineering and other engineering fields, and the composite wall can meet the requirement of 1X10-9Less permeability below cm/s and better durability requirements. However, in some cases, due to the sedimentation and precipitation existing in the wall forming process between the composite wall and the bottom bedrock, micro water permeable pores exist between the composite wall and the bedrock, which may become potential water permeable channels, thereby affecting the use effect of the structure.
Disclosure of Invention
In view of the defects or shortcomings in the prior art, the invention aims to provide a method for monitoring and grouting the contact surface permeation of a composite HDPE film continuous wall and bedrock, wherein a contact surface grouting pipeline is laid before an impermeable HDPE film is arranged below the composite HDPE film continuous wall; after the continuous wall is built, the permeation condition of the contact surface is detected through a grouting pipeline with a loop, and under the condition of permeation, reinforced grouting and re-irrigation are completed simultaneously, so that the bottom seepage-proofing performance of the composite HDPE film continuous wall is improved.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, the embodiment of the invention provides a method for monitoring the permeability of a contact surface between a composite HDPE film underground continuous wall and bedrock, wherein a grouting loop consisting of a grout conveying pipe, a grouting pipe and a grout return pipe is laid before the HDPE film is arranged below the HDPE film, and after the underground continuous wall is built, a fluid is injected into the grouting loop to monitor whether a liquid phase permeates into the contact surface or not through flow change, so that the permeability of the contact surface is monitored; wherein, grout outlet holes are arranged on the pipe wall of the grouting pipe at intervals.
As a preferred embodiment of the invention, on the composite HDPE membrane of the underground continuous wall, PE pipes with the inner diameter of about 1cm are fixed at the two sides of the vertical direction of the membrane unit, which are close to the welding connection part of the membrane and the joint, wherein one side is a slurry feeding pipe, and the other side is a slurry return pipe; and a grouting pipe with the inner diameter of about 1cm is fixed on the tight side surface of the bottom end of the diaphragm unit, and two ends of the grouting pipe are respectively communicated with the grout feeding pipe and the grout returning pipe, so that a grouting loop is formed.
As a preferred embodiment of the invention, PE pipes are fixed on two sides of the membrane unit and are fixed by using pipeline clamps or binding bands special for HDPE membranes.
As a preferred embodiment of the invention, the HDPE film dedicated pipeline clamp or binding belt is welded with the HDPE film membrane unit by adopting extrusion type thermal fusion welding.
As a preferred embodiment of the invention, the grouting pipe and the grout conveying pipe, and the grouting pipe and the grout returning pipe are fixedly connected by adopting hollow hard plastic connectors, and the inner and outer diameters of the hard plastic connectors are matched with pipelines at two ends; the two ends of the grouting pipe below the connector are provided with a certain bending angle and extend towards the two sides to completely cover the bottom of the HDPE membrane.
As a preferred embodiment of the invention, when permeability monitoring is carried out, air is firstly adopted to flush the pipeline and confirm that the pipeline is unblocked; then, connecting flowmeters at two ports of a slurry feeding pipe and a slurry return pipe, grouting a grouting pipeline under preset pressure after a grouting pump is connected with the slurry feeding pipe, and judging whether slurry in the grouting pipe permeates into a contact surface or not by comparing the flowmeter at the grouting port of the grouting pipe with the flowmeter at the slurry outlet of the slurry return pipe; the amount of slurry permeating into the contact surface is calculated by the difference between the two flow meters.
In a second aspect, the embodiment of the invention also provides a grouting method for the contact surface of the composite HDPE film underground diaphragm wall and the bedrock, wherein the grouting method adopts a grouting loop adopted by the permeation monitoring method; the permeation monitoring and the grouting can be carried out simultaneously; or, according to the contact surface permeation monitoring result, repeatedly performing grouting for multiple times based on the grouting pipeline.
As a preferred embodiment of the invention, the grouting pressure is 0.5-2 MPa.
In a preferred embodiment of the present invention, the grouting material is a chemical grouting liquid such as propylene.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
a grouting loop consisting of a slurry conveying pipe, a grouting pipe and a slurry return pipe is laid before the HDPE film is arranged, and after the underground continuous wall is built, grouting slurry or other fluids are added into the grouting loop to monitor whether a liquid phase in the grouting pipe permeates into a contact surface through flow change, so that the permeation condition of the contact surface is monitored; when the permeation situation occurs and needs grouting, corresponding slurry is injected into the grouting loop to finish the grouting and reinforcement of the contact surface.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a front view of a grouting pipeline laying structure of a contact surface of a composite HDPE film underground wall and a bedrock, which is provided by the embodiment of the invention;
fig. 2 is a sectional view of a grouting pipeline laying structure of a contact surface of a composite HDPE film underground wall and a bedrock, which is provided by the embodiment of the invention.
Description of reference numerals:
1-HDPE film membrane units; 11-membrane fixation clips or straps; 12-welding a seam; 13-membrane locking and buckling; 2-slurry feeding pipe; 21-slurry feeding port; 3-a slurry return pipe; 31-a pulp return port; 4-grouting pipe; 41-connecting head.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
The embodiment of the invention provides a method for monitoring the permeation of a contact surface of a composite HDPE film underground continuous wall and bedrock, wherein a grouting loop consisting of a grout conveying pipe, a grouting pipe and a grout return pipe is laid before the HDPE film is arranged, and after the underground continuous wall is built, grouting liquid or other fluids are added into the grouting loop to monitor whether a liquid phase permeates into the contact surface or not through the flow change, so that the permeation condition of the contact surface is monitored; when the permeation situation occurs and needs grouting, corresponding slurry is injected into the grouting loop to finish the grouting and reinforcement of the contact surface.
Fig. 1 is a front view of a grouting pipeline laying structure of a contact surface of a composite HDPE film underground wall and a bedrock provided by the embodiment, and fig. 2 is a sectional view. As shown in fig. 1 and fig. 2, on a composite HDPE membrane diaphragm 1 of an underground continuous wall, PE pipes with an inner diameter of about 0.5-2.0 cm are fixed at two sides of the diaphragm unit 1 in the vertical direction near the connection of the diaphragm and the joint, wherein one side is a slurry feeding pipe 2, and the other side is a slurry return pipe 3; a grouting pipe 4 with the inner diameter smaller than 1cm (preferably 0.5-1.0 cm) is fixed on the bottom end tight side surface of the diaphragm unit, and two ends of the grouting pipe are respectively communicated with the grout feeding pipe 2 and the grout returning pipe 3, so that a grouting loop is formed; the grouting pipe 4 is a composite pipe with small grout outlet holes and protective rubber sleeves arranged on the pipe wall at intervals. The protective rubber sleeve prevents the underground continuous wall material from entering the grouting pipe through the small grout outlet hole, but can allow the grouting material to pass through from inside to outside under the action of pressure.
PE pipes are fixed on two sides of the membrane unit and are fixed through pipeline clamps or binding bands 11 special for HDPE membranes. The pipeline clamp or the binding band 11 special for the HDPE film is welded with the HDPE film membrane unit by adopting extrusion type hot melt welding, and the HDPE film membrane is not damaged.
The inner wall of the PE pipe is smooth.
The grouting pipe 4 is fixedly connected with the grout conveying pipe 2, the grouting pipe 4 is fixedly connected with the grout return pipe 3 through a hollow hard plastic connector 41, and the inner diameter and the outer diameter of the hard plastic connector 41 are matched with pipelines at two ends. The two ends of the grouting pipe below the connector are provided with proper bending angles and extend to two sides to completely cover the bottom of the HDPE membrane, so that the fluid in the pipe can conveniently flow back.
After the HDPE membrane is laid with a grouting pipeline, laying the composite HDPE membrane underground continuous wall; after the engineering is finished, two outward ports 21 and 31 of the slurry feeding pipe and the slurry return pipe are sealed to keep the pipelines smooth.
When permeability monitoring is carried out, pressure air is firstly adopted to flush the pipeline, and the pipeline is confirmed to be unblocked. Then, connecting flow meters at two ports of a slurry feeding pipe and a slurry return pipe, grouting a grouting pipeline under preset pressure after a grouting pump is connected with the slurry feeding pipe, and knowing whether slurry in the grouting pipe permeates into a contact surface or not by comparing the flow meter at the grouting port of the grouting pipe with the flow meter at the slurry outlet of the slurry return pipe; the amount of the slurry permeating into the contact surface can be known through the difference between the two flowmeters, so that the permeation condition of the contact surface can be calculated and judged. When the contact surface of the diaphragm wall and the bedrock is permeated, most slurry sent into the grouting pipe by the slurry sending pipe permeates into the contact surface due to the permeation action, a small amount of slurry flows out of the slurry return pipe due to the fact that the pressure of the slurry sending pipe is not permeated within the existence time, the time for the slurry return pipe to flow back can be calculated according to the length of a grouting loop and the grouting speed, but the time for the slurry return pipe to flow back is far later than the calculated theoretical time due to the fact that the slurry return amount is reduced due to the permeation action; in addition, after the slurry return is started, the difference value of the flow meter is still larger than the capacity of the slurry return pipeline due to the permeation effect, and the difference value tends to become smaller along with the increase of time and the reduction of the permeation effect, so that the permeation condition of the contact surface can be judged.
The embodiment of the invention also provides a grouting method, which can be simultaneously carried out with the permeation monitoring method, and can also be independently carried out again based on a grouting pipeline according to the preliminary judgment of the permeation condition of the contact surface. Increasing or reducing grouting pressure, adjusting grouting raw materials and concentration, and grouting. And after grouting is finished, cleaning the grouting pipeline, keeping the grouting pipeline smooth, and sealing the two ports so as to facilitate subsequent re-grouting. Preferably, the grouting pressure is 0.5-2 MPa.
Preferably, the grouting raw material adopts propylene system and other chemical grouting liquid which is easy to bond with concrete and rock, so that the grouting material has good durability, easy grouting property and interface bonding property, and ensures that the poured medium and the interface have higher seepage resistance and strength.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (8)
1. A permeation monitoring and grouting method for a contact surface of a composite HDPE film underground continuous wall and bedrock is characterized in that a grouting loop consisting of a slurry conveying pipe, a grouting pipe and a slurry return pipe is laid before the HDPE film is arranged below the HDPE film, and after the underground continuous wall is built, slurry is injected into the grouting loop, and the change condition of the slurry in the grouting pipe permeating into the contact surface is monitored through the change of flow rate, so that the permeation monitoring is carried out on the contact surface; wherein, the grouting pipe at the contact part with the bedrock is a composite pipe with grouting small holes and a protective rubber sleeve arranged on the pipe wall at intervals; the protective rubber sleeve prevents the underground continuous wall material from entering the grouting pipe through the small grout outlet hole, but can allow the grout to pass from inside to outside under the action of pressure;
when permeability monitoring is carried out, pressure air is adopted to flush the pipeline to confirm the smoothness of the pipeline; then, connecting flow meters at two ports of a slurry conveying pipe and a slurry return pipe, after a slurry injection pump is connected with the slurry conveying pipe, injecting slurry into a slurry injection pipeline under preset pressure, and judging whether slurry permeates into a contact surface or not through comparison between the flow meter at the slurry injection port of the slurry injection pipe and the flow meter at the slurry outlet of the slurry return pipe; calculating the amount of slurry permeating into the contact surface according to the difference between the two flowmeters;
when the contact surface of the diaphragm wall and the bedrock is permeated, most slurry sent into the grouting pipe by the slurry sending pipe permeates into the contact surface due to the permeation action, a small amount of slurry flows out of the slurry return pipe due to the fact that the pressure of the slurry sending pipe is not permeated within the existence time, the time for the slurry return pipe to flow back can be calculated according to the length of a grouting loop and the grouting speed, but the time for the slurry return pipe to flow back is far later than the calculated theoretical time due to the fact that the slurry return amount is reduced due to the permeation action; in addition, after the slurry return is started, the difference value of the flow meter is still larger than the capacity of the slurry return pipeline due to the permeation effect, and the difference value tends to become smaller along with the lengthening of time and the weakening of the permeation effect, so that the permeation condition of the contact surface can be judged;
when the permeation situation occurs and needs grouting, corresponding slurry is filled in the grouting loop to finish the grouting and reinforcement of the contact surface.
2. The method for monitoring the permeability and grouting of the contact surface between the composite HDPE film underground continuous wall and the bedrock according to claim 1, wherein a PE pipe with the inner diameter of 0.5-2.0 cm is fixed on the HDPE film compounded with the underground continuous wall at the position, close to the joint where the film and the special coupling joint are welded, of two sides of the film unit in the vertical direction, wherein one side of the PE pipe is a slurry feeding pipe, and the other side of the PE pipe is a slurry returning pipe; and a grouting pipe with the inner diameter of 0.5-1.0 cm is fixed on the side surface of the bottom end of the diaphragm unit, and two ends of the grouting pipe are respectively communicated with the slurry feeding pipe and the slurry return pipe, so that a grouting loop is formed.
3. The method for monitoring the permeability and grouting of the contact surface of the composite HDPE film underground continuous wall and the bedrock according to claim 2, wherein PE pipes are fixed on two sides of the membrane unit and are fixed by adopting pipe clamps or binding bands special for HDPE films.
4. The method for monitoring and grouting the permeation of the contact surface of the composite HDPE film underground continuous wall and the bedrock according to claim 3, wherein the HDPE film special pipeline clamps or binding bands are welded with the HDPE film membrane units by adopting extrusion type thermal fusion welding.
5. The method for monitoring the permeability of the contact surface of the composite HDPE film underground continuous wall and the bedrock and grouting the contact surface of the composite HDPE film underground continuous wall and the bedrock according to claim 2, wherein the grouting pipe is fixedly connected with the grout conveying pipe and the grouting pipe and the grout returning pipe through hollow hard plastic connectors, and the inner diameter and the outer diameter of each hard plastic connector are matched with pipelines at two ends; the two ends of the grouting pipe below the connector are provided with a certain bending angle and extend towards the two sides to completely cover the bottom of the HDPE membrane.
6. The method for monitoring and grouting the permeability of the contact surface of the composite HDPE film underground continuous wall and the bedrock according to any one of claims 1 to 5, wherein the permeation monitoring and the grouting are carried out simultaneously; or repeatedly performing grouting for multiple times based on the grouting loop according to the contact surface permeation monitoring result.
7. The method for monitoring the permeability of the contact surface of the composite HDPE film underground continuous wall and the bedrock and grouting the contact surface of the composite HDPE film underground continuous wall and the bedrock, wherein the grouting pressure is 0.5-2 MPa.
8. The method for monitoring and grouting the contact surface permeation of the composite HDPE film underground continuous wall and the bedrock according to claim 6, wherein the raw material of the slurry is propylene-based chemical grouting slurry.
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| CN115753546A (en) * | 2022-11-14 | 2023-03-07 | 中国水电基础局有限公司 | Device and method for measuring permeability coefficient of assembled HDPE (high-density polyethylene) film high-standard anti-seepage system |
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| JP2010112110A (en) * | 2008-11-10 | 2010-05-20 | Shimizu Corp | Grout injecting method and grout injector |
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