Construction method for improving construction quality of water purification plant main body structure

Abstract

The invention discloses a construction method for improving construction quality of a water purification plant main body structure, which comprises five steps of surveying and setting out, pile site release, hammering pile construction, bottom plate construction and main body structure construction, and is characterized in that the main body structure construction adopts a skip warehouse method to carry out concrete engineering construction, and needs to sequentially carry out steel bar engineering and template support engineering construction; by adopting the large-volume concrete thin-layer pouring technology, the construction quality of the main body structure of the water purification plant is remarkably improved, the viscosity and slump of concrete are accurately controlled in a batch and small-area step-by-step construction mode, so that the compactness and strength of the concrete are improved, the pouring quality is ensured, and meanwhile, the construction efficiency is improved. According to the construction mode of fine management and efficient cooperation, the construction period is shortened, the construction efficiency is improved, the cost is reduced, in addition, pollution to the environment and harm to constructors are reduced through small-area gradual construction, the comprehensive cost is saved through application of the new technology, the construction period is shortened, and environmental pollution is reduced.

Description

Technical Field

[0001] The present invention relates to the field of construction technology, and more particularly to a construction method for improving the construction quality of a main structure of a water purification plant. Background Art

[0002] With the continuous development of the domestic infrastructure market, in order to ensure the people's production and living water needs, large-scale water plants will emerge in large numbers. The main reason is that people's demand for purified water has increased, resulting in an increasing number of water purification plants in my country. At present, the construction of the water purification plant pool has similarities with general engineering construction, but there are also differences. That is, the construction quality of the water purification plant entity is higher than that of general construction projects. The quality of the construction entity will directly affect the water quality in the water purification plant. At the same time, in actual construction, the inventor found that the existing technology has the following problems: Currently, water plant projects have numerous water tanks and structures. These structures, such as the folded plate flocculation horizontal flow sedimentation tank, clear water tank, V-shaped filter, sludge water regulating tank, recycled water tank, and suction well, are large and irregularly sized thin-walled concrete structures. The water tank structures are primarily self-waterproofing, without waterproofing membranes. The physical construction quality of water treatment plants is higher than that of general construction projects. The physical quality of construction directly affects the water quality of the water treatment plant. Traditional water plants are smaller in scale, with more conventional construction techniques, and are often plagued by problems with the construction techniques, such as leaks in the clear water tank. This, in turn, affects the quality of water plant construction. Therefore, in response to the above problems, a construction method for improving the construction quality of the main structure of a water purification plant is proposed. Summary of the Invention

[0003] In order to overcome the above-mentioned defects of the prior art, the present invention provides a construction method for improving the construction quality of the main structure of a water purification plant, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a construction method for improving the construction quality of the main structure of a water purification plant, the construction method steps are as follows: S1. Surveying and setting out: Establishing an on-site surveying and setting out control system, and laying out the axis of the building and the foundation pit excavation line during pile driving construction according to the surveying and setting out control system; S2. Release of pile position: Using the measurement control system and axis, the pile position is controlled and released by driving a white gray cross line into the ground; S3. Hammer pile construction: Re-check the axis of the building and the location of the piles. If the re-check is passed, the piles will be pressed to the point and the construction will be carried out to ensure that the center of the pile and the placement point are on the same vertical line; S4. Base plate construction: After measurement and review, the template axis and elevation are strictly controlled, and control points are set on each side, and then construction is carried out according to design requirements; S5. Construction of the main structure: The concrete engineering construction is carried out using the skip-bin method. Before the concrete engineering construction, the reinforcement engineering and the formwork support engineering construction are required to be carried out in sequence.

[0005] Preferably, in step S3, as the pile bottom is sunk, the verticality and deviation of the pile are checked and verified at any time. The verticality of the pile is monitored by the double-sided hanging line method to ensure that the verticality of the pile is controlled within 0.5% of the pile length. At the same time, the construction process of the pile should meet the design requirements. After the welding of the pile tip and pile body is completed, it is naturally cooled for 8 minutes before continuing to sink the pile. The on-site surveyor uses a level to monitor the pile delivery depth and keeps records for each pile.

[0006] Preferably, in step S5, the main structure is constructed according to the six sections of main structure with five pool wall deformation joints, the width of the deformation joint is 30 mm, an external waterstop and a center-hole steel-edged rubber waterstop are set at the deformation location, and one post-cast expansion reinforcement belt is set.

[0007] Preferably, in step S5, the construction steps of the reinforcement project are as follows: A1. The reinforcement construction team is responsible for the delivery and stacking of reinforcement on site, and for checking the quality of reinforcement; A2. Process the steel bars into semi-finished products according to the design drawings and the steel bar cutting table, hang up the signboards, and stack them neatly according to categories; A3. The steel bar joints are connected by mechanical connection, and the measured ultimate tensile strength of the steel bar joints meets the specifications.

[0008] Preferably, in step S5, the formwork support engineering specifically includes: strictly controlling the formwork axis and elevation, using 15mm plywood, using Ø48×2.8mm for the secondary ribs of the siding formwork, and using double-jointed steel pipes Ø48×2.8mm for the main ribs, which are fixed by bolts, and performing construction separately according to waterproofing requirements, which are as follows: For exterior wall panels with waterproofing requirements, a square water stop ring is welded in the middle of the bolts; For partition walls without waterproofing requirements, place PVC pipes and then install tension bolts. Control points are set on each side, and the formwork is checked by pulling wires during the construction process.

[0009] Preferably, in step S5, the construction steps of the concrete engineering are as follows: B1. The surveying engineer will perform horizontal and vertical measurements and set out the concrete. At the same time, the hydraulic system of the trolley will be activated to position the steel formwork according to the measurement data, and the concrete raw materials will be tested in the laboratory. B2. The mixing station adopts an electronic automatic metering system, and the concrete mixing is strictly measured and mixed according to the designed mix ratio; B3. Concrete shall be transported by concrete trucks and its homogeneity shall be maintained. The duration from unloading from the mixer to completion of pouring shall not exceed 120 minutes. B4. Use the skip-bin method to pour concrete for the main body; B5. The formwork can be removed only after the concrete reaches the designed strength, and moisture-retaining maintenance can be carried out by sprinkling water or covering with film or black cotton.

[0010] Preferably, in step S5, the skip-bin method used for the main structure is as follows: concrete is poured from the formwork window from bottom to top, symmetrically in layers, in the order of wall first and arch later, and the free falling height of the concrete does not exceed 2.0m, and a sky pump is used for pouring the main structure concrete during the construction of the main structure. The concrete construction strictly implements the supervision and on-site supervision system, and the slump of the commercial concrete and the mix ratio of the opening appraisal are first checked before pouring the concrete, and pouring is allowed only after passing the inspection.

[0011] Preferably, in step S5, by analyzing the technical requirements for structural concrete anti-seepage and the causes of structural concrete leakage, measures are taken to prevent structural concrete leakage as follows: Lower the temperature of concrete entering the mold; Concrete should be mixed continuously during transportation; Steel bars should be derusted strictly in accordance with relevant regulations and standards; Concrete pouring construction should be carried out strictly in accordance with the procedures; Improve the strength and rigidity of formwork support.

[0012] Preferably, in step S5, the following measures should be taken to treat the construction joints, expansion joints and post-cast strips: The concrete pouring in batches must be carried out only after the original concrete reaches the specified strength requirements; Before pouring concrete again on the original concrete surface, remove the slurry and loose particles on the original concrete surface, and roughen the concrete surface to expose the coarse aggregate, making the surface uneven; Use high-pressure water to rinse the surface and thoroughly clean the dirt, loose aggregates and debris on the original concrete surface, allowing the concrete surface to fully absorb water and moisten; The waterstops and waterstop adhesives at construction joints and expansion joints should be installed straight, closely, and in the correct position and method; When pouring concrete, the joints should be vibrated repeatedly to make them close together. At the same time, measures should be taken to prevent the waterstop from moving and being damaged.

[0013] Technical effects and advantages of the present invention: 1. Compared with the existing technology, this construction method for improving the construction quality of the main structure of a water purification plant adopts a large-volume concrete thin layer pouring technology that adopts a batch and small-area step-by-step construction method. It can accurately control the viscosity and slump of concrete pouring, thereby improving the density and strength of concrete and ensuring the pouring quality.

[0014] 2. Compared with the existing technology, the large-volume concrete thin layer pouring technology in this construction method for improving the construction quality of the main structure of the water purification plant adopts a construction model of refined management and efficient collaboration, which can shorten the construction period, improve construction efficiency and reduce construction costs.

[0015] 3. Compared with the existing technology, this construction method for improving the construction quality of the main structure of a water purification plant adopts a small-area step-by-step construction method because the large-volume concrete thin layer pouring technology avoids the pollution and harm to the construction environment caused by one-time large-area pouring, and reduces the harm and danger to construction workers.

[0016] 4. Compared with the existing technology, this construction method for improving the construction quality of the main structure of a water purification plant adopts a new casting process to ensure the construction of thin-walled concrete, PHC pipe piles, etc., which saves the overall construction cost and improves the quality, promotes the construction period, and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a flow chart of a construction method for improving the construction quality of a main structure of a water purification plant.

[0018] Figure 2 The present invention provides a flow chart of the steel bar construction process for a construction method for improving the construction quality of a main structure of a water purification plant.

[0019] Figure 3 The present invention provides a flow chart of a concrete engineering construction method for improving the construction quality of a main structure of a water purification plant. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0021] Example 1 As attached Figures 1 to 3 A construction method for improving the construction quality of the main structure of a water purification plant is shown. The construction method steps are as follows: S1. Surveying and setting out: Based on the on-site design drawings and the coordinate control points and elevation control elevations provided by the owner, a site surveying and setting out control system is first established. The axis of the building is laid out according to the surveying and setting out control system. The excavation line for the foundation pit during pile driving construction is laid out according to the axis dimensions and the dimensions of the pile driving construction work surface. After the surveying and setting out control system is established, a self-inspection is first performed. Once the self-inspection is confirmed to be correct, the supervisor and the owner are asked to conduct a re-inspection. Only after the re-inspection is qualified can the axis and excavation line be laid out; S2. Release of pile points: Release each pile point through the established measurement control system and axis. To ensure that the deviation of the pile point meets the specification requirements, a white gray cross line is driven into the ground for control. The allowable deviation of the point release should not exceed 10mm. S3. Hammer pile construction: Before pile sinking, the building axis and the pile placement points must be rechecked. Only after self-inspection and supervisor re-inspection confirmation can the pile be aligned. During alignment, the pile center must be ensured to be on the same vertical line as the placement point. During the pile sinking process, the verticality and deviation of the pile must be checked and verified at any time. The verticality of the pile is monitored using the double-sided hanging line method to ensure that the verticality of the pile is controlled within 0.5% of the pile length. S4. Bottom plate construction: Based on the design plan and red line positioning points, the surveying person in charge will lay out the lines, and the supervision engineer will review them. The template axis and elevation will be strictly controlled. At the same time, control points will be set on each side. The template will be checked by pulling the wire during the construction process. The next step of construction will be carried out after the design is met. The concrete construction will strictly implement the supervision and on-site supervision system. Before pouring concrete, the slump of commercial concrete and the mix ratio of the opening appraisal will be spot-checked. Only after passing the inspection can it be poured. It will be vibrated and compacted as required, and the surface will be smooth and leveled. In addition, according to the requirements of the approved concrete test block retention plan, concrete standard curing and test blocks of the same curing conditions will be retained on site. During the concrete curing construction, the concrete will be covered with film for curing and watered for maintenance. After the construction is completed, the visual quality of the concrete structure on the construction site will be pre-inspected by the construction unit, supervision and construction unit. After all the inspections are qualified, the next step of construction will be carried out. S5. Construction of the main structure: The construction is organized according to the six sections of the main structure with five pool wall deformation joints. The wall panels and walkway panels are cast in one go. The skip-bin method is used to construct the main structure. The main structure construction is carried out in the order of reinforcement engineering, formwork support engineering and concrete engineering. The formwork can be removed only after the concrete reaches the designed strength. Moisturizing and maintenance are carried out by sprinkling water or covering with film and black cotton.

[0022] Example 2 Based on Example 1, the solution in Example 1 is further detailed in combination with the following specific working methods. Figures 1 to 3 As shown, see the following description for details: As a preferred embodiment, in step S3, the piles should be stable during lifting, hoisting and transportation, and the position of the lifting points should meet the design requirements. According to the lifting sequence, the shipped piles must be supported and fixed during transportation to prevent the piles from rolling and hitting during transportation. The vehicle should maintain stable driving to ensure that the pile body is not deformed, tilted or damaged, and the quality of the pile body during transportation is ensured. As the pile bottom sinks, the verticality and deviation of the pile are checked and verified at any time. The verticality of the pile is monitored by the double-sided hanging line method to ensure that the verticality of the pile is controlled within Within the range of 0.5% of the pile length, the construction process of the pile should meet the design requirements. After the pile tip joint is welded, the weld should be cooled for 8 minutes under natural conditions before continuing to sink the pile. At the same time, when delivering the pile, in order to ensure that the pile top elevation reaches the design elevation, the on-site measurement engineer uses a level to monitor the delivery depth of each pile when delivering the pile, so that the pile top elevation of the delivered pile meets the design requirements. During the construction process, the delivery depth and delivery pressure value of each pile should be recorded, the construction record should be filled in in detail, and the verticality and pile body quality of each pile should be recorded in detail to ensure the construction quality.

[0023] As a preferred embodiment, in step S5, the main structure is constructed according to the six sections of the main structure with five pool wall deformation joints. The width of the deformation joint is 30 mm. External waterstops and medium-hole steel-edged rubber waterstops are set at the deformation locations, and polyethylene foam plastic board caulking materials are used for caulking. A post-cast expansion reinforcement belt is set with a width of 2 m. The wall panels are made of C30 concrete with a water-resistance grade of P6. The reinforcement belts are made of C35 concrete with a water-resistance grade of P6. The walkway boards are 1.2 m wide and 0.12 m thick and are made of C30 concrete.

[0024] As a preferred embodiment, in step S5, the construction steps of the steel bar engineering are as follows: A1. The rebar construction team is responsible for the installation, tying, and connection of rebar on site. The rebar storage area on site should be flat and hardened, and all materials and equipment should be placed in a dry area with a rain shelter. The storage area should be adjacent to the road to facilitate the lifting and transfer of rebar. All rebar raw materials entering the site must have a factory certificate of conformity. The material receiver should carefully verify that the origin, batch number, and specifications match the certificate of conformity. Only after confirmation can the goods be accepted for delivery. A2. First, prepare a steel bar cutting list according to the design and construction drawings and specifications. The design and construction drawings will be reviewed and produced by the relevant person in charge according to the material list. The shape and size of the steel bars must meet the design requirements. The surface of the steel bars must be clean and free of damage. Oil stains, paint stains, and rust, if any, must be removed before use. Steel bars with granular and flaky rust must not be used. At the same time, when cutting and bending steel bars, pay attention to the accuracy of the length. There should be no warping or unevenness on the flat surface after bending. There should be no cracks at the bending points of the steel bars. After the steel bars are processed into semi-finished products, they must be marked according to category, diameter, and location of use, and neatly stacked and transported to the construction site before use. A3. Mechanical connection is preferred for steel bar joints. The joint grade is Class II, and the measured ultimate tensile strength of the steel bar joints meets the specifications. When lap welding is used, the double-sided weld length is 5d, and the single-sided weld length is 10d. The joint area on the same cross section should not exceed 50%, and the length of the connection section should be 35d and not less than 500mm. Horizontal wall panel reinforcement joints should be mechanically connected or welded, while vertical wall panel reinforcement should preferably be welded. When tied lap joints are used, the diameter of the tensile reinforcement should not exceed 25mm, and the diameter of the compressive reinforcement should not exceed 28mm. Φ8 ties should be installed in the pool wall for effective tensioning. The protective layer thickness of the wall panel reinforcement is 30mm, the protective layer thickness of the beam and column reinforcement is 35mm, and the protective layer thickness of the roof reinforcement is 30mm.

[0025] As a preferred embodiment, in step S5, the formwork support engineering is specifically as follows: strictly control the formwork axis and elevation, use 15mm thick plywood for the formwork, use Ø48×2.8mm for the secondary ribs of the siding formwork with a longitudinal spacing of 30cm, use double-jointed steel pipes Ø48×2.8mm for the main ribs, use bolts that can be disassembled at both ends for the tension bolts, and carry out the construction separately according to the waterproofing requirements. The waterproofing construction requirements are as follows: For exterior wall panels with waterproofing requirements, a square water stop ring is welded in the middle of the bolts. After the bolts are removed, a 40-50mm deep tapered groove is left on the wall panel surface and filled and smoothed with 1:1 waterproof cement mortar. For partition walls without waterproofing requirements, place PVC pipes before installing tension bolts. After removing the tension bolts, use cement mortar to seal the tension bolt holes. In addition, control points should be set on each side during the construction process, and the formwork should be checked by pulling wires during the construction process.

[0026] As a preferred embodiment, in step S5, the construction steps of the concrete engineering are as follows: B1. First, the surveying engineer will conduct horizontal and vertical surveys and set out the structure. Simultaneously, the trolley hydraulic system will be activated. The steel formwork will be positioned according to the survey data, ensuring that the centerline of the lining trolley is aligned with the tunnel centerline. Once the arch wall formwork is positioned and secured, measurements will be conducted for verification. Debris, accumulated water, and loose ballast will be cleared from the base. A steel stopper formwork will be installed at the front of the lining trolley, and a fixed waterstop will be installed according to design requirements. The waterstop protective formwork will be removed from the construction joints of the upper lining concrete, and the waterproofing system will be self-inspected. After passing the self-inspection, the project will be reported to the supervising engineer for a covert inspection. Upon approval from the supervising engineer, further steps will be taken. A coarse aggregate processing system will be established at the quarry to ensure that the coarse aggregate production quality meets all required concrete specifications. Upon arrival at the construction site, the concrete will be inspected according to the concrete raw material testing specifications. Bagged cement will be used, and a factory certificate of conformity must be obtained. Upon arrival at the site, the testing center will conduct various performance tests according to the specifications. After cement enters the warehouse, it should be stacked in batches with covers and pads as required by regulations. If the cement has exceeded its expiration date of three months or is found to be damp and lumpy, it should be downgraded after identification. Before using mixing water, the water should be chemically analyzed for acid content and can only be used if it passes the test. B2. The mixing station utilizes an electronic automatic metering system. Concrete mixing is strictly measured and mixed according to the designed mix ratio. The mix ratio is designed based on a combination of calculation and testing, meeting the design strength, corrosion resistance, durability, and workability requirements, and the principles of rational material use and economy. Technical requirements for pumped concrete mix ratios: The ratio of the maximum aggregate particle size to the inner diameter of the delivery pipe should not exceed 1:3, and the maximum size should not exceed 40mm. The sand passing a 0.315mm sieve should not be less than 15%; B3. Concrete should maintain its homogeneity during transportation, without stratification, segregation, or leakage. When transported to the pouring site, it must meet the slump requirements. The duration from unloading from the mixer to completion of pouring should not exceed 120 minutes. B4. Use the skip-bin method to pour concrete for the main body. Unexpected interruptions to concrete pouring should not exceed 2 hours. Otherwise, it will be treated as a construction joint. Lining concrete is vibrated mechanically using inserted vibrators and attached vibrators to compact the concrete, avoiding collisions with steel bars, formwork, embedded parts, and waterstops. The vibrator should be inserted approximately 50mm into the lower concrete layer. B5. The formwork can be removed only after the concrete reaches the designed strength, and moisture-retaining maintenance can be carried out by sprinkling water or covering with film or black cotton.

[0027] As a preferred embodiment, in step S5, the content of the skip-bin method used for the main structure construction is: concrete is poured from the formwork window, from bottom to top, symmetrically in layers, first the wall and then the arch, and the free height of the fall does not exceed 2.0m. The main structure is constructed using the skip-bin method, and a sky pump is used to pour the main structure concrete. The concrete construction strictly implements the supervision and on-site supervision system. Before pouring concrete, the slump of commercial concrete and the mix ratio of the opening appraisal are first checked. Only after passing the inspection can it be poured. According to the requirements, it is vibrated and compacted, the surface is polished and leveled. According to the requirements of the approved concrete test block retention plan, concrete standard curing and test blocks of the same curing conditions are retained on site. During the concrete curing construction, it is covered with a film for maintenance, and water is usually poured for maintenance. The visual quality of the concrete structure at the construction site is pre-accepted by the construction unit, the supervisor and the construction unit.

[0028] As a preferred embodiment, in step S5, by analyzing the technical requirements for structural concrete anti-seepage and the causes of structural concrete leakage, the following measures are taken to prevent structural concrete leakage: Lower the temperature of concrete entering the mold. In hot seasons, concrete pouring should be arranged as much as possible during a time with lower temperatures. At the same time, the temperature of concrete entering the mold can be controlled by lowering the temperature of sand, stone and mixing water. Concrete should be continuously stirred during transportation to ensure the quality of concrete entering the construction site; Steel bars should be derusted strictly in accordance with relevant regulations and standards; Concrete pouring construction should be carried out strictly in accordance with the procedures. The speed should be slowed down appropriately during pouring. When vibrating, avoid honeycombing caused by missed tamping, or sand turning and loose tamping caused by too long or too short vibration time. The interval time between concrete pouring should be controlled within the allowable range. If the interval time exceeds the allowable range, concrete pouring can only be carried out after the strength requirements are met and the construction joints are treated according to the relevant requirements. Improve the strength and rigidity of the formwork support. The formwork surface should be smooth and clean, with tight joints and no leakage of slurry. The support should be reliable and have sufficient stability.

[0029] As a preferred embodiment, in step S5, the following measures should be taken to treat the construction joints, expansion joints and post-casting strips: When pouring concrete in batches, the next step can only be done after the original concrete reaches the specified strength requirement; Before pouring concrete again on the original concrete surface, the slurry and loose particles on the original concrete surface should be removed, and the concrete surface should be roughened to expose the coarse aggregate so that the surface is uneven. Use high-pressure water to rinse the surface and thoroughly clean the dirt, loose aggregates and debris on the original concrete surface, allowing the concrete surface to fully absorb water and moisten; The installation of waterstop strips and waterstop adhesives for construction joints and expansion joints should be straight, close-fitting, and installed in the correct position and method. Before pouring concrete, they should be strictly inspected for damage and correct position. Concrete pouring can only be carried out after they meet the requirements. When pouring concrete, the joints should be vibrated repeatedly to make them close together. At the same time, measures should be taken to prevent the waterstop from moving and being damaged.

[0030] The working process of the present invention is as follows: first, based on the design drawings, the coordinate control points and elevation control elevations provided by the owner, an on-site measurement and layout control system is established, the axis of the building is placed according to the measurement and control system, and the foundation pit excavation line of the pile driving construction surface is placed according to the size requirements. After completing the measurement and layout, a self-inspection is carried out, and then the supervisor and the owner are asked to re-inspect. Construction can be continued only after confirmation. Then, the pile position deviation is controlled by driving white lime cross lines into the ground to ensure the accuracy of the pile position. The verticality and deviation of the pile are checked and verified at any time before and during the pile sinking process, and adjustments are made when necessary. Then, the layout is carried out according to the design plan and the red line positioning points, and the person in charge of measurement reviews it, and control points are set on each side. Spot checks are carried out strictly in accordance with the slump and the ratio of the opening inspection. Only after passing the inspection can it be poured, and a film or black cotton is used for moisturizing and maintenance. After that, 5 pool wall deformation joints and six sections of the main structure are used to organize the construction, and the concrete is poured in one go. Type, use the skipping method for construction, give priority to mechanical connection joint grade II, ensure that the surface of the steel bar is clean and undamaged, strictly control the axis and elevation of the formwork, use 15mm thick plywood, and carry out construction separately according to the waterproofing requirements, first carry out horizontal and elevation measurement and layout, then start the trolley hydraulic system to position the steel formwork, use the electronic automatic metering system to mix the concrete, ensure the mix ratio is accurate, maintain uniformity during concrete transportation, avoid stratification, segregation, and leakage, use inserted vibrating rods and attached vibrators to vibrate and compact, and at the same time remove the floating slurry and loose particles on the original concrete surface, rinse the surface with high-pressure water to ensure that the joints are close, and then the concrete is poured from the formwork window from bottom to top, symmetrically layered, first wall and then arch, with a pouring height of no more than 2.0m. The concrete construction strictly implements the supervision and on-site supervision system to ensure that each step meets the requirements of the specifications. The above is the working principle of this construction method for improving the construction quality of the main structure of a water purification plant.

Claims

1. A construction method for improving the construction quality of the main structure of a water purification plant, characterized by: The construction method steps are as follows: S1. Surveying and setting out: Establishing an on-site surveying and setting out control system, and laying out the axis of the building and the foundation pit excavation line during pile driving construction according to the surveying and setting out control system; S2. Release of pile position: Using the measurement control system and axis, the pile position is controlled and released by driving a white gray cross line into the ground; S3. Hammer pile construction: Re-check the axis of the building and the location of the piles. If the re-check is passed, the piles will be pressed to the point and the construction will be carried out to ensure that the center of the pile and the placement point are on the same vertical line; S4. Bottom plate construction: After measurement and review, the template axis and elevation are strictly controlled, and control points are set on each side, and then construction is carried out according to design requirements; S5. Construction of the main structure: The concrete engineering construction is carried out using the skip-bin method. Before the concrete engineering construction, the reinforcement engineering and the formwork support engineering construction are required to be carried out in sequence.

2. A construction method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S3, as the pile bottom is sunk, the verticality and deviation of the pile are checked and verified at any time. The verticality of the pile is monitored using the double-sided hanging line method to ensure that the verticality of the pile is controlled within 0.5% of the pile length. At the same time, the pile construction process should meet the design requirements. After the pile tip and pile body are welded, they are naturally cooled for 8 minutes before continuing to sink the pile. The on-site surveyor uses a level to monitor the pile depth and keeps records for each pile.

3. A construction method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S5, the main structure is constructed according to the six sections of the main structure with five pool wall deformation joints. The width of the deformation joint is 30 mm. External waterstops and center-hole steel-edged rubber waterstops are set at the deformation points, and one post-cast expansion reinforcement strip is set.

4. A construction method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S5, the construction steps of the steel bar project are as follows: A1. The reinforcement construction team is responsible for the delivery and stacking of reinforcement on site, and for checking the quality of reinforcement; A2. Process the steel bars into semi-finished products according to the design drawings and the steel bar cutting table, hang up the signboards, and stack them neatly according to categories; A3. The steel bar joints are connected by mechanical connection, and the measured ultimate tensile strength of the steel bar joints meets the specifications.

5. The construction method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S5, the formwork support project specifically includes: strictly controlling the formwork axis and elevation, using 15mm plywood, using Ø48×2.8mm for the secondary ribs of the siding formwork, and using double-jointed steel pipes Ø48×2.8mm for the main ribs, which are fixed by bolts, and performing construction according to the waterproofing requirements, which are as follows: For exterior wall panels with waterproofing requirements, a square water stop ring is welded in the middle of the bolts; For partition walls without waterproofing requirements, place PVC pipes and then install tension bolts. Control points are set on each side, and the formwork is checked by pulling wires during the construction process.

6. The method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S5, the construction steps of the concrete engineering are as follows: B1. The surveying engineer will perform horizontal and vertical measurements and set out the concrete. At the same time, the hydraulic system of the trolley will be activated to position the steel formwork according to the measurement data, and the concrete raw materials will be tested in the laboratory. B2. The mixing station adopts an electronic automatic metering system, and the concrete mixing is strictly measured and mixed according to the designed mix ratio; B3. Concrete shall be transported by concrete trucks and its homogeneity shall be maintained. The duration from unloading from the mixer to completion of pouring shall not exceed 120 minutes. B4. Use the skip-bin method to pour concrete for the main body; B5. The formwork can be removed only after the concrete reaches the designed strength, and moisture-retaining maintenance can be carried out by sprinkling water or covering with film or black cotton.

7. The method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S5, the skip-bin method used for the main structure is as follows: concrete is poured from the formwork window, from bottom to top, symmetrically in layers, in the order of wall first and arch later, and the free falling height of the concrete does not exceed 2.0m. In the construction of the main structure, a sky pump is used to pour the main structure concrete. The concrete construction strictly implements the supervision and on-site supervision system. Before pouring concrete, the slump of the commercial concrete and the mix ratio of the opening appraisal are first checked, and pouring is allowed only after passing the inspection.

8. The construction method for improving the construction quality of the main structure of a water purification plant according to claim 1, characterized in that: In step S5, by analyzing the technical requirements for structural concrete anti-seepage and the causes of structural concrete leakage, the following measures are taken to prevent structural concrete leakage: Lower the temperature of concrete entering the mold; Concrete should be mixed continuously during transportation; Steel bars should be derusted strictly in accordance with relevant regulations and standards; Concrete pouring construction should be carried out strictly in accordance with the procedures; Improve the strength and rigidity of formwork support.

9. A construction method for improving the construction quality of the main structure of a water purification plant according to claim 3, characterized in that: In step S5, the following measures should be taken to treat construction joints, expansion joints and post-casting strips: The concrete pouring in batches must be carried out only after the original concrete reaches the specified strength requirements; Before pouring concrete again on the original concrete surface, remove the slurry and loose particles on the original concrete surface, and roughen the concrete surface to expose the coarse aggregate, making the surface uneven; Use high-pressure water to rinse the surface and thoroughly clean the dirt, loose aggregates and debris on the original concrete surface, allowing the concrete surface to fully absorb water and moisten; The waterstops and waterstop adhesives at construction joints and expansion joints should be installed straight, closely, and in the correct position and method; When pouring concrete, the joints should be vibrated repeatedly to make them close together. At the same time, measures should be taken to prevent the waterstop from moving and being damaged.

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