A method for waterproofing the inner wall of a gas station tank operating well

Abstract

The application discloses a kind of gas station oil tank operating well inner wall waterproof construction method, the method includes: base treatment and stubble;To rigid or flexible waterproof sleeve gap plugging;0 number repair sealing material prepared by 0 number lithium base lubricating grease and ordinary Portland cement according to weight ratio 1:(1.8-2.2) is repaired around pipeline;Brush polymer JS waterproof coating as bottom layer, two times and add glass cloth;After drying, 2 number middle layer elastic waterproof coating prepared by 0 number lithium base lubricating grease adding silicon dioxide is brushed;Finally, 3 number surface layer thick waterproof protective material prepared by sulphoaluminate cement adding waterproof powder and cellulose is sprayed, two times and add glass cloth, and is polished.Eight operating wells are taken as an example, the construction period of the application is 3-4 days, and the cost is about 80,000 yuan.Compared with prior art, the construction period is shortened, the cost is reduced, and the excavation is not needed, so the influence on oil station operation is small.

Description

Technical Field

[0001] This invention belongs to the field of waterproofing construction technology for gas stations, specifically a method for waterproofing the inner wall of the operating well of a gas station oil tank. Background Technology

[0002] Gas station oil tank operating wells are mainly classified into three types according to their materials: brick masonry and plastered operating wells, reinforced concrete operating wells, and composite prefabricated operating wells. Among them, composite prefabricated operating wells account for the largest proportion. The pipes (oil, gas, and electricity pipes) passing through the wall inside the operating well include three types: rigid waterproof sleeves, flexible waterproof sleeves, and direct burial.

[0003] Currently, leakage prevention in gas station operating wells mainly adopts external waterproofing technology, which involves waterproofing the outside of the operating well. However, this technology has the following problems in practical applications:

[0004] 1. The construction period is relatively long, usually requiring 15-20 days;

[0005] 2. The project cost is relatively high. Taking the eight operating wells corresponding to four oil tanks as an example, the cost of using external protective technology is approximately 350,000 yuan.

[0006] 3. Excavation work is required, which will have some impact on the normal operation of the gas station. Summary of the Invention

[0007] The purpose of this invention is to provide a method for waterproofing the inner wall of the operating well of a gas station tank, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a method for waterproofing the inner wall of the operating well of a gas station tank, comprising the following steps:

[0009] Step 1: Perform base treatment on the inner wall and bottom surface of the operating well to ensure that the construction surface is clean, dry, free of dust and oil stains; use explosion-proof tools to roughen the outer edge of the through-wall pipe, oil tank manhole and the inside corner of the bottom surface.

[0010] Step Two: Check whether the gaps between the rigid waterproof sleeve, flexible waterproof sleeve, and pipe are tightly sealed; for the rigid waterproof sleeve, if there is leakage, clean the original filler and refill it tightly; for the flexible waterproof sleeve, if there is leakage, first clean the filler inside the sleeve, then refill it tightly with No. 0 lithium-based grease and hemp, and then tighten the pressure plate with bolts; for the pipes around the through-wall pipe of the composite operating well, repair and press it tightly with No. 0 repair and sealing material; the No. 0 repair and sealing material is composed of No. 0 lithium-based grease and ordinary silicate cement in a weight ratio of 1:(1.8-2.2);

[0011] Step 3: Apply or spray No. 1 waterproof coating to the walls and bottom of the operating well, in two coats with horizontal and vertical cross-coating, each coat being 1mm thick; for the inside corners of the well, around the pipes, and at the junction of the manhole and the bottom, lay fiberglass cloth between the two coats; the No. 1 waterproof coating is a polymer JS waterproof coating.

[0012] Step 4: After the coating in Step 3 is completed, allow it to dry naturally in a ventilated environment. Then, apply No. 2 intermediate elastic waterproof coating to the walls and bottom, with a thickness of 1mm. The No. 2 intermediate elastic waterproof coating is composed of No. 0 lithium-based grease with 10% by weight of silica.

[0013] Step 5: After the construction in Step 4 is completed, spray the No. 3 thick waterproof protective material in two coats, with a total thickness of 8-10mm. Lay glass cloth between the two coats and smooth the surface with a trowel. The No. 3 thick waterproof protective material is composed of sulfoaluminate cement with 3% waterproof powder by weight and 0.3% cellulose by weight.

[0014] As a further preferred embodiment of this technical solution: the gaps of the rigid waterproof sleeve in step two are sealed with hemp oil or asbestos cement.

[0015] As a further preferred embodiment of this technical solution: after cleaning the original filler, the flexible waterproof sleeve in step two is filled with No. 0 lithium-based grease and hemp oil, and the pressure plate is tightened with bolts. The degree of tightening should be such that a small amount of grease is evenly squeezed out around the pressure plate.

[0016] As a further preferred embodiment of this technical solution: in the No. 0 repair and sealing material, the weight ratio of No. 0 lithium-based grease to ordinary silicate cement is preferably 1:2.

[0017] As a further preferred embodiment of this technical solution: the No. 0 lithium-based grease has a penetration of 355-385 (0.1 mm) or the corresponding NLGI consistency grade 0.

[0018] As a further preferred embodiment of this technical solution: the glass cloth in steps three and five is medium-alkali or alkali-free glass fiber cloth.

[0019] As a further preferred embodiment of this technical solution: the natural drying time in step four is approximately 1 hour, which can be adjusted appropriately based on the ambient temperature, humidity, and coating thickness.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] 1. In this invention, taking 8 operating wells corresponding to 4 oil tanks as an example, the construction using the method of this invention only takes 3-4 days, while the existing external protection technology takes 15-20 days.

[0022] 2. In this invention, taking the same 8 operating wells as an example, the construction cost of the method of this invention is about 80,000 yuan, while the existing external protection technology costs about 350,000 yuan.

[0023] 3. In this invention, the method is constructed on the inner wall of the operating well, without the need for excavation, thus having a minimal impact on the normal operation of the gas station.

[0024] 4. In this invention, a multi-layer composite waterproof system is formed by sequentially constructing a repair and sealing layer, a bottom waterproof layer, a middle elastic water-repellent layer, and a top thick protective layer, combined with glass cloth reinforcement and calendering processes. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] The method for waterproofing the inner wall of this invention was implemented in eight composite prefabricated operating wells corresponding to four oil tanks at a gas station.

[0028] 1. Material Preparation

[0029] No. 0 repair and sealing material: Use No. 0 lithium-based grease and ordinary silicate cement, weigh them at a weight ratio of 1:2 (it should be understood that this ratio can be appropriately adjusted within the range of 1:1.8 to 1:2.2, and all of them can achieve basically the same effect), and stir them thoroughly until they form a uniform paste.

[0030] No. 1 base waterproof coating: Commercially available polymer JS waterproof coating.

[0031] No. 2 intermediate layer elastic waterproof coating: Use No. 0 lithium-based grease, add 10% by weight of silica, and mix thoroughly.

[0032] Thick waterproof protective material for No. 3 surface layer: Based on the weight of sulfoaluminate cement, add 3% waterproof powder and 0.3% cellulose. After the dry powder is mixed evenly, add water and stir until it reaches a suitable consistency for construction.

[0033] Reinforcing material: medium-alkali or alkali-free fiberglass cloth, cut to appropriate size for use in corners, pipe roots, and other areas.

[0034] 2. Construction Steps

[0035] Step 1: Surface preparation and roughening

[0036] Clean the inner wall and bottom of the operating well, remove floating dust and oil stains, and ensure that the surface is clean and dry. Use explosion-proof tools to roughen the outer edge of the wall-penetrating pipe, the manhole of the oil tank, and the inside corner of the bottom surface to increase the adhesion of the subsequent waterproof layer.

[0037] Step Two: Sealing and Repairing Gaps Between Through-Wall Pipes

[0038] Check the gap between the rigid waterproof sleeve, the flexible waterproof sleeve and the pipe:

[0039] For rigid waterproof sleeves, if leakage is found, clean the original filler (such as cement filler) and refill it tightly with hemp or asbestos cement.

[0040] For flexible waterproof sleeves, if leakage is found, first clean the original filler inside the sleeve, then refill it tightly with No. 0 lithium-based grease and hemp, and tighten the pressure plate with bolts. The tightness should be such that a small amount of grease is squeezed out evenly around the pressure plate.

[0041] For the pipes around the wall-penetrating pipe of the composite operation well, use No. 0 repair and sealing material to repair them and press them firmly with a trowel.

[0042] Step 3: Applying the base waterproof coating

[0043] Apply No. 1 primer waterproof coating (polymer JS waterproof coating) evenly to the walls and bottom of the operating well. The coating is applied in two coats: the first coat is applied horizontally, and the second coat is applied vertically after the surface is dry. The thickness of each coat is controlled at 1mm. At the inside corners of the well, around the pipes, and at the junction of the manhole and the bottom, lay medium-alkali or alkali-free fiberglass cloth between the two coats as a reinforcement layer to prevent the coating from cracking.

[0044] Step 4: Application of intermediate layer elastic waterproof coating

[0045] After the base coat from step three has dried naturally in a ventilated environment for about 1 hour (the specific time should be adjusted according to the ambient temperature, humidity and coating thickness), apply No. 2 intermediate elastic waterproof coating (No. 0 lithium-based grease + 10% silica) evenly to the wall and bottom, with a thickness of 1mm. This coating can seal the capillary pores of the base mortar and form a flexible water-repellent layer.

[0046] Step 5: Application of thick waterproof protective material for the surface layer

[0047] After the intermediate coating in step four is completed, the topcoat should be applied immediately. Thick waterproof protective material No. 3 should be sprayed in two coats: the first coat should be sprayed to an appropriate thickness, followed by the application of medium-alkali or alkali-free fiberglass cloth, and then the second coat should be sprayed to a total thickness of 8-10mm. After the topcoat is applied, it should be smoothed with a trowel to make the surface flat and dense.

[0048] 3. Construction Results

[0049] All 8 operating wells were completed in a total of 4 days. After water testing, there was no leakage in the operating wells. The total construction cost was approximately 80,000 yuan (including materials, labor, and equipment).

[0050] In contrast, the gas station had previously used external protective technology to repair four other operating wells, which took 18 days and cost 360,000 yuan.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for waterproofing the inner wall of the operating well of a gas station tank, characterized in that, Includes the following steps: Step 1: Perform base treatment on the inner wall and bottom surface of the operating well to ensure that the construction surface is clean, dry, free of dust and oil stains; use explosion-proof tools to roughen the outer edge of the through-wall pipe, oil tank manhole and the inside corner of the bottom surface. Step Two: Check whether the gaps between the rigid waterproof sleeve, flexible waterproof sleeve, and pipe are tightly sealed; for the rigid waterproof sleeve, if there is leakage, clean the original filler and refill it tightly; for the flexible waterproof sleeve, if there is leakage, first clean the filler inside the sleeve, then refill it tightly with No. 0 lithium-based grease and hemp, and then tighten the pressure plate with bolts; for the pipes around the through-wall pipe of the composite operating well, repair and press it tightly with No. 0 repair and sealing material; the No. 0 repair and sealing material is composed of No. 0 lithium-based grease and ordinary silicate cement in a weight ratio of 1:(1.8-2.2); Step 3: Apply or spray No. 1 waterproof coating to the walls and bottom of the operating well, in two coats with horizontal and vertical cross-coating, each coat being 1mm thick; for the inside corners of the well, around the pipes, and at the junction of the manhole and the bottom, lay fiberglass cloth between the two coats; the No. 1 waterproof coating is a polymer JS waterproof coating. Step 4: After the coating in Step 3 is completed, allow it to dry naturally in a ventilated environment. Then, apply No. 2 intermediate elastic waterproof coating to the walls and bottom, with a thickness of 1mm. The No. 2 intermediate elastic waterproof coating is composed of No. 0 lithium-based grease with 10% by weight of silica. Step 5: After the construction in Step 4 is completed, spray the No. 3 thick waterproof protective material in two coats, with a total thickness of 8-10mm. Lay glass cloth between the two coats and smooth the surface with a trowel. The No. 3 thick waterproof protective material is composed of sulfoaluminate cement with 3% waterproof powder by weight and 0.3% cellulose by weight.

2. The method for waterproofing the inner wall of the operating well of a gas station tank according to claim 1, characterized in that, The natural drying time in step four is approximately 1 hour.

3. The method for waterproofing the inner wall of the operating well of a gas station tank according to claim 1, characterized in that, In the No. 0 repair and sealing material, the weight ratio of No. 0 lithium-based grease to ordinary silicate cement is 1:2.