Emergency seepage prevention method for permeable reactive barrier

Abstract

The invention discloses an emergency anti-seepage method for a permeable reactive barrier, which comprises the following steps of: 1, determining a construction position of the permeable reactive barrier according to underground water hydrogeological conditions and the like, excavating a groove to a water-resisting layer by utilizing equipment such as an excavator, a hydraulic grab bucket and a continuous excavating machine, an outer frame body of the front wall body and an outer frame body of the rear wall body are arranged in the excavated groove; according to the invention, the water-permeable wall body formed by the water-permeable structural body frame in a special shape is directly combined by using a chamfer shape and then can be directly mounted into the PVC white pipe and the screen pipe to form the underground water monitoring well, and the underground water monitoring well does not need to be continuously constructed in the permeable reactive barrier by using a drilling machine; the front wall body can be used as a reaction wall and can also be used as a safety wall, when emergency pollution leakage occurs in a production enterprise, the prefabricated water-permeable structure wall body is replaced with the prefabricated water-impermeable wall body, migration of pollutants can be effectively blocked, and the uncontrollable pollution source leakage phenomenon is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of permeable reaction walls, in particular to an emergency anti-seepage method for permeable reaction walls. Background Art

[0002] The problem of groundwater pollution has become increasingly serious due to the development of industrialization, seriously affecting human health. The remediation and risk control of groundwater pollution are imminent. Based on the advantages of high remediation efficiency, easy availability of materials, and low secondary pollution, the groundwater permeable reaction wall (PRB) has been widely used in groundwater risk control and remediation in production and decommissioned chemical parks, landfills, etc.; PRB is prone to problems such as filler clogging and surface passivation during actual use. In order to facilitate the replacement of fillers, the Chinese invention application with publication number CN111807437A discloses a modular PRB repair method with environmental risk control function; the Chinese invention application with publication number CN118307085A discloses a quickly replaceable assembled permeable reaction wall structure and its use method; both use modular and easily replaceable filler permeable reaction walls to achieve filler replacement, but have the following defects:

[0003] This type of modular and easily replaceable filler permeable reaction wall can realize the rapid replacement of reaction fillers, but it does not take into account the possible uncontrollable pollution source leakage in the production park where the permeable reaction wall has been built, and cannot effectively block the migration of groundwater pollutants.

[0004] To this end, we propose a permeable reactive wall emergency waterproofing method to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a method for emergency anti-seepage of a permeable reaction wall to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for emergency anti-seepage of a permeable reaction wall, comprising the following steps:

[0007] Step 1: Determine the construction location of the permeable reaction wall according to the groundwater hydrogeological conditions, use excavators, hydraulic grabs, continuous excavators and other equipment to dig trenches to the waterproof layer, and place the outer frames of the front wall and the rear wall in the excavated trenches;

[0008] Step 2: Establish a permeable structural frame of the front wall and the rear wall according to the required wall size, and use multiple permeable structural frames to form a permeable reactive wall;

[0009] Step 3: Load the reaction filler into the permeable structure frame to form a prefabricated permeable wall, place multiple prefabricated permeable walls in the outer frame, and combine to form a permeable reaction wall. The chamfered combination formed by the combination of multiple prefabricated permeable walls can be directly used as a groundwater monitoring well by placing a PVC white pipe and a screen pipe;

[0010] Step 4: When an emergency leak occurs and needs to be blocked, the prefabricated permeable wall is replaced with a prefabricated non-permeable wall.

[0011] Preferably, the reaction wall in step 1 can be a continuous wall type or a water gate type.

[0012] Preferably, the water-permeable structural frame of the front wall and the rear wall in step 2 uses 70-150 kg / m 3 The cement is mixed with gravel or crushed stone, and the thickness of the front wall in step 2 is within 20 cm.

[0013] Preferably, the cement is of 42.5MPa or 52.5MPa grade, and the gravel or crushed stone is 10-20mm.

[0014] Preferably, the size of the prefabricated impermeable wall in step 4 is consistent with the size of the prefabricated permeable wall, the material of the prefabricated impermeable wall is concrete, and the chamfered combination formed by the combination of multiple prefabricated impermeable walls serves as a groundwater monitoring well.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention adopts a permeable wall formed by a permeable structural frame of a specially made shape. After the chamfered shape is combined, the PVC white pipe and the screen tube can be directly loaded to form a groundwater monitoring well. There is no need to continue to use a drilling rig in the permeable reaction wall to construct the groundwater monitoring well. The front wall in the present invention can be used as a reaction wall or as a safety wall. When an emergency pollution leakage occurs in an operating enterprise, the prefabricated permeable structural wall is replaced with a prefabricated non-permeable wall, which can effectively block the migration of pollutants and avoid uncontrollable leakage of pollution sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of wall construction in the first, second and third embodiments of the present invention;

[0018] Figure 2 Schematic diagram of the shape structure of the outer frame in the first, second and third embodiments of the present invention;

[0019] Figure 3 It is a schematic diagram of the water permeable structure frame in the first, second and third embodiments of the present invention;

[0020] Figure 4It is a top view of the prefabricated permeable wall in the first, second and third embodiments of the present invention;

[0021] Figure 5 Schematic diagram of prefabricated impermeable walls in the first, second and third embodiments of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] See also Figure 1-5 The present invention provides a technical solution: a method for emergency anti-seepage of a permeable reaction wall, comprising the following steps:

[0025] Step 1: Determine the construction location of the permeable reaction wall according to the groundwater hydrogeological conditions, use excavators, hydraulic grabs, continuous excavators and other equipment to dig trenches to the waterproof layer, and place the outer frames of the front wall and the rear wall in the excavated trenches;

[0026] Step 2: According to the required wall size, a permeable structural frame of the front wall and the rear wall is established, and a plurality of permeable structural frames are spliced ​​to form a permeable reaction wall. The provided permeable structural frame has good permeability, strength and corrosion resistance. The high permeability can ensure that the natural groundwater flow field will not change, and the high strength and corrosion resistance can ensure that the structural frame can be reused;

[0027] Step 3: Load the reaction filler into the permeable structure frame to form a prefabricated permeable wall, place multiple prefabricated permeable walls in the outer frame, and combine to form a permeable reaction wall. The chamfered combination formed by the combination of multiple prefabricated permeable walls is used as a groundwater monitoring well. The permeable wall formed by the permeable structure frame with a special shape can be directly used as a groundwater monitoring well by directly placing the PVC white pipe and the screen pipe in the chamfered shape, without the need to continue to use a drilling rig to construct a groundwater monitoring well in the permeable reaction wall;

[0028] Step 4: When an emergency leakage occurs and needs to be blocked, the prefabricated permeable wall will be replaced with a prefabricated non-permeable wall. The front wall can be used as a reaction wall or as a safety wall. When an emergency pollution leakage occurs in an operating enterprise, the prefabricated permeable wall will be replaced with a prefabricated non-permeable wall, which can effectively block the migration of pollutants and prevent uncontrollable pollution source leakage.

[0029] Embodiment 2:

[0030] See also Figure 1-5 , which is the second embodiment of the present invention, and this embodiment is based on the previous embodiment. In step 1, the reaction wall can be a continuous wall type or a water gate type.

[0031] The permeable structural frame of the front wall and the rear wall in step 2 uses 70-150kg / m 3 The cement is mixed with gravel or crushed stone. The thickness of the pre-wall in step 2 is within 20 cm.

[0032] The cement is of 42.5MPa or 52.5MPa grade, and the gravel or crushed stone is 10-20mm.

[0033] The size of the prefabricated impermeable wall in step 4 is consistent with that of the prefabricated permeable wall. The material of the prefabricated impermeable wall is concrete. The chamfered combination formed by the combination of multiple prefabricated impermeable walls can be directly used as a groundwater monitoring well by placing PVC white pipes and screen pipes.

[0034] Embodiment 3:

[0035] See also Figure 1-5 , which is the second embodiment of the present invention. This embodiment is based on the previous embodiment. The present invention adopts a permeable wall formed by a permeable structural frame of a specially made shape. The PVC white pipe and the screen pipe can be directly loaded after the chamfered shape is combined, and can be directly used as a groundwater monitoring well. There is no need to continue to use a drilling rig to construct a groundwater monitoring well in the permeable reaction wall; the front wall in the present invention can be used as a reaction wall or as a safety wall. When an emergency pollution leak occurs in a production enterprise, the prefabricated permeable structural wall is replaced with a prefabricated non-permeable wall, which can effectively block the migration of pollutants and avoid uncontrollable leakage of pollution sources.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for emergency anti-seepage of a permeable reactive wall, characterized in that: The following steps are involved: Step 1: Determine the construction location of the permeable reaction wall according to the groundwater hydrogeological conditions, use excavators, hydraulic grabs, continuous excavators and other equipment to dig trenches to the waterproof layer, and place the outer frames of the front wall and the rear wall in the excavated trenches; Step 2: Establish a permeable structural frame of the front wall and the rear wall according to the required wall size, and use multiple permeable structural frames to form a permeable reactive wall; Step 3: Load the reactive filler into the permeable structural frame to form a prefabricated permeable wall, place multiple prefabricated permeable walls in the outer frame, and combine to form a permeable reactive wall. The chamfered combination formed by the combination of multiple prefabricated permeable walls can be directly placed in a PVC pipe as a groundwater monitoring well; Step 4: When an emergency leak occurs and needs to be blocked, the prefabricated permeable wall is replaced with a prefabricated non-permeable wall.

2. The method for emergency anti-seepage of a permeable reactive wall according to claim 1, characterized in that: In the step 1, the reaction wall can be a continuous wall type or a water gate type.

3. The method for emergency anti-seepage of a permeable reactive wall according to claim 2, characterized in that: The water-permeable structural frame of the front wall and the rear wall in step 2 uses 70-150 kg / m 3 The cement is mixed with gravel or crushed stone, and the thickness of the front wall in step 2 is within 20 cm.

4. The method for emergency anti-seepage of a permeable reactive wall according to claim 3, characterized in that: The cement is of 42.5MPa or 52.5MPa grade, and the gravel or crushed stone is 10-20mm.

5. The method for emergency anti-seepage of a permeable reactive wall according to claim 1, characterized in that: The size of the prefabricated impermeable wall in step 4 is consistent with the size of the prefabricated permeable wall. The material of the prefabricated impermeable wall is concrete. The chamfered combination formed by the combination of multiple prefabricated impermeable walls can be directly used as a groundwater monitoring well by placing a PVC white pipe and a screen pipe.

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