Chimney reinforcement company, chimney repair and reinforcement

1. Project Overview:

According to the information provided by the owner and the on-site inspection of our company's technical personnel, the main construction body of the project is a 32m and 28m high brick chimney, due to the long running time, there are many cracks in the middle of the chimney barrel. In order to ensure the safety of industrial equipment and the normal production of the owner, the chimney must be repaired and reinforced. According to the current situation of the chimney, the effect of simply adding hoops to the cracks in the middle of the chimney is not good, according to the company's construction experience of similar projects for many years and the return visit of users of similar projects, our company believes that the outer wall of the chimney can be ensured by adding hoops and vertical bars to ensure the safety of chimney operation.

Second, the construction requirements:

Chimney outer wall reinforcement: with -60 6 flat iron on the outer wall of the chimney with a hoop (1 50cm, plus 6 vertical bars, the hoop and the vertical bar corresponding welding) to reinforce, to prevent the chimney cracks from continuing to increase.

Inspection and replacement of chimney lightning protection facilities: inspect the top lightning rod and lightning protection perimeter, and replace the damaged part if it is found; The lightning rod implements anti-corrosion chimney maintenance construction in the lower part of the concrete top and the annular perimeter.

Anti-corrosion of steel components such as chimney ladders (alkyd blending paint, etc.): first, rust removal (knock once to remove floating dust and rust spots, brush with wire brush, and rub with iron abrasive cloth); Secondly, check whether there is damage or desoldering parts, and repair the damaged parts and weld the desoldering parts; Secondly, brush the primer once and the topcoat twice.

Chimney top repair: remove the loose and corroded part of the chimney top and repair it with cement mortar to restore the original state.

3. Construction technical measures:

This project adopts the special operation technology of "no scaffolding" and "hanging from height" for construction.

The project adopts high-altitude suspension movable seat-type ascending plate construction operation, with the steel bar of 25 to make "S" shaped steel hook at the top mouth of the chimney according to equal parts to fix tightly, on the "S" shaped steel hook hangs on the pulley and then uses a 18mm of white brown rope through the pulley and anchors in a fixed position, the other end of the white-brown rope is fixed with a "U" shaped rivet lock, movable seat-type ascending plate is fixed on the "U" shaped rivet lock, and the construction personnel operate from top to bottom in movable seat-type ascending board.

During construction, the construction materials used are transported to the specified height by a special person who is responsible for pulling up and down to the specified height through a brown rope suspended separately.

The outer wall of the chimney is reinforced.

The production of hoops: according to the size of the circumference of the outer wall of the concrete chimney from top to bottom, make a hoop of different sizes every 50cm (the material of the hoop is -50 5 flat iron). Each clamp is made up of the same two pieces, and the flange is welded at both ends of each clamp (the flange is also made of flat iron, and its length is 80mm), and a drill is drilled in each flange before welding, with a hole diameter of 18mm, and equipped with fastening screws (16 260mm).

Installation of hoop: before the installation of the hoop, hang 6 vertical bars (the material is -50 5 flat iron) on the outer wall according to the circumference of the outer wall of the chimney in equal parts, and then wrap the made hoop outside the vertical bar according to the size of the circumference of the outer wall of the chimney, and the two pieces of hoop are fastened with 4 matching bolts, in order to increase its firmness, each hoop and each vertical bar are welded firmly by electric welding.

Is the chimney concrete? It's concrete, I can reinforce.

The basis for the preparation.

Code for Anti-Corrosion Design of Industrial Buildings》 Current version.

Technical Code for Safety of Work at Height in Building Construction" JGJ80-91

Construction Safety Inspection Standards" JGJ 59-99

Technical Code for Temporary Electricity Safety at Construction Site" JGJ 46-2005

Building Construction Manual, Fourth Edition.

1. Painting the color ring of the chimney navigation mark: first, carefully clean the old color ring to sweep away the dust on the surface; Secondly, the warped skin and falling off parts should be cleaned with special tools such as shovels to keep the cylinder wall smooth and beautiful; Then use the roller to manually paint the special navigation paint of the Lehua brand, and paint the two sides of the two layers. The height of each section of the color ring is maintained in proportional size, and the design and construction are carried out according to the font and color of the original company logo.

The colors are red and white).

2. Inspect all steel structures such as chimneys, ladders, and net protection platforms, and repair the damaged and dewelded parts: remove rust on the surface of the treated steel components (knock once to fall off the floating dust and rust spots, grind the wire brush again, and then use the grinder to remove the rust electrically, and then rub it with an iron abrasive cloth to reach the level of the national standard GB8923); Secondly, the surface of the treated steel components is coated with two primers and two sides, and the materials are Lehua epoxy zinc-rich primer (iron red), epoxy micaceous iron intermediate paint (tan), and acrylic polyurethane topcoat (medium gray).

3. Dismantle the damaged ladder of the cooling water tower, and remove rust and anti-corrosion of the remaining ladder. Dismantled objects land slowly and safely, and place them neatly and centrally.

First, the general situation of the project.

50m brick chimney, due to long-term use, cracks appear on the surface of the chimney, the outer surface and the external reinforcement of the steel structure are seriously corroded, and the current situation of the chimney seriously threatens the safety of production. The main engineering quantities are shown in the following table:

Remarks on the project name of the unit quantity of the order, the sub-section, the item.

1 Hoop Making Road 45

2 vertical bars to make roots 8

3 hoop installation road 45

4. Vertical bar installation root 8

5 package hoop paint road 45

6 vertical bars paint root 8

7. Exposed metal steel structure, anti-corrosion, M45 ladder, etc.

8. Key avoidance auspicious thunder system maintenance set.

Technical measures. 1, with 60 6 flat steel according to the chimney parts of the perimeter of the production of hoops and vertical bars, after the production of hoops and vertical bars, rust removal and anti-corrosion (anti-rust primer twice, silver powder topcoat twice), installation hoops and vertical bars, vertical bars according to the chimney perimeter evenly distributed 6, hoops are evenly arranged every 100cm, a total of 20, hoop connecting plate is made of 60 6 flat steel, fixed with bolts, hoop installation should be flat in the middle, close to the whole, screws should be tightened, vertical bars are arranged on the inside of the hoop, and used 20 of the reinforcing bolts fastened.

2. When the hoop vertical bar is made, the draft should be accurate and make various records, and it should be reviewed before installation to prevent errors and omissions.

Chimney maintenance construction planChimney maintenance construction plan.

3. The weld should be uniform and full during welding, and there should be no leakage welding, false welding and other phenomena.

4. The relative humidity is not more than 90% during the welding operation, and the quality of the assembly and surface cleaning of the welding part should be checked before welding, and it is strictly forbidden to fill the welding rod head, iron and other sundries in the joint gap. (Appendix 1 of the schematic diagram of ladder and platform production).

5. Check the entire lightning protection system, including lightning rods, lightning cables and lightning enclosures, etc., and replace them immediately, and ensure that their grounding resistance is not greater than 10 ohms.

6. For the exposed metal components of the chimney, rust removal should be carried out first, and then the anti-rust primer should be applied twice, and the silver powder topcoat should be applied twice.

**：l38-5lo6-5559

First, the chimney maintenance project overview:

1. Replace the lightning rod;

2. Upper, middle and lower lightning protection enclosures are made and replaced;

3. The upper part of the chimney ladder is partially replaced;

4. The upper platform of the chimney and the enclosure part are replaced;

5. Replace the drain tray;

6. Chimney ladders, platforms, return finger lightning rings, lightning rods, and water trays are anti-corrosive and painted;

7. The upper part of the chimney and its cracks should be repaired and reinforced.

Construction requirements: basic construction requirements: from the bottom to the top of the construction, the completion of the previous process to create construction conditions for the next process, the construction of the next process to ensure that the finished product of the previous process is not damaged, reduce unnecessary rework waste, to ensure the quality of the project.

After the construction is completed, the tested grounding resistance should be less than 4 ohms, if the requirements are not met, the grounding electrode will be added until the requirements are met. This chimney is installed according to the third type of lightning protection building, and the grounding resistance should be less than 4 ohms. The lightning receiver is installed at the top of the chimney, made of 316L (solid) stainless steel with a diameter of 25mm, and the lightning protection perimeter is made of 60*6 stainless steel flat steel 316L to form a ring lightning protection belt.

The lightning protection down wire is welded from top to bottom with 60*6 stainless steel flat steel 316L, and then welded with 60*5 galvanized flat iron. The underground ring is surrounded by a 40*4 galvanized flat steel lightning protection bus, and a grounding electrode is added to reduce the grounding resistance to achieve the purpose of lightning protection.

1. Production and installation of lightning rods.

1) The lightning rod is made of stainless steel 316L (solid) with a diameter of 25mm, installed in three, each with a length of meters, and the front end is 150mm heated with a hand hammer or sharpened with a grinding wheel;

2) The lightning ring is made of 60*6 stainless steel flat steel 316L, with a height of meters and a length of about 50 meters;

3) The lightning rod should be installed vertically firmly, and the allowable deviation of verticality is 3 1000.

Preliminary construction plan:

According to the on-site investigation, it was preliminarily judged that the mortar of the brick joints was aging, and the gaps were not tightly compacted, and smoke leakage. Specific diseases must be erected scaffolding for sampling and observation. Combined with the site situation, the preliminary consideration of the construction plan is as follows:

erection of construction scaffolding;

exterior wall surface cleaning;

Vertically, 50 5 steel strips are used, which are fixed on the outer wall of the chimney with expansion bolts, and the spacing is 500mm. The hoop is welded and fixed with 40 4 steel strip and vertical steel strip, and the spacing is 500mm. After the construction is completed, an integral steel grid is formed to wrap the chimney, and the role is one

limit the hoop deformation of the chimney; 2: play a skeleton role for the follow-up process mortar surface layer.

steel plate with external steel wire mesh sheet; Coating of interface agent;

The surface is plastered with high-strength polymer mortar, with a thickness of 40 50mm. High-strength polymer mortar uses polymer as filler epoxy mortar, which has the advantages of strong adhesion to the base layer, high early strength, simple and convenient construction, fast and short curing time.

After the construction is completed, the polymer mortar has no shrinkage, no expansion, and no cracking, so that the outside of the chimney forms a stronger outer wall.

Construction process and operation points.

Process. Construction preparation: scaffolding erection, exterior wall cleaning, embedded vertical steel strip, circumferential steel strip welding and fixing, external steel wire mesh sheet, exterior wall coating interface agent, polymer mortar plastering, curing, mold removal.

Our company specializes in chimney construction, brick chimney construction engineering, boiler chimney construction construction unit.

The qualified quality standards for chimney construction projects shall meet the following requirements.

1. The qualified quality standards for chimney construction projects shall comply with the following provisions.

1. The quality of the construction of the chimney project shall be acceptable;

2. The quality control data should be complete;

3. The safety and function testing data of each division and sub-division included in the chimney project should be complete;

4. The acceptance of the perception quality should meet the requirements.

2. When the quality of the chimney project does not meet the requirements, it should be dealt with according to the following provisions:

1. After rework, redo or replace the inspection batch of appliances and equipment, the acceptance shall be re-conducted;

2. The inspection batch that meets the design requirements shall be accepted by the inspection batch that has been tested and identified by a qualified testing unit;

3. When the design requirements cannot be met by the testing and appraisal of the qualified testing unit, but the knot can be met by the accounting and approval of the original design unit.

The inspection batch of the safety and use function of the structure can be accepted by the sub;

4. The division or sub-project that has been repaired or reinforced, when the external dimensions are changed and can meet the requirements of safe use, can be pressed.

Acceptance of technical processing plans and negotiation documents.

General requirements for the design of chimney construction.

1. Relevant norms that should be implemented.

1. When designing the chimney, in addition to complying with the "Chimney Design Code" GB50051-2002, it should also comply with the relevant provisions of the following specifications:

1) Code for Design of Concrete Structures GB50010-2002.

2) Code for Design of Masonry Structures GB5003-2001.

3) Code for Design of Steel Structures GB50017-2003.

4) Code for Design of Building Foundations GB5007-2002.

5) Code for Seismic Design of Buildings GB50011-2001.

6) Code for Loading of Building Structures GB50009-2001.

2. When encountering collapsible loess, expansive soil and other geological conditions or mining areas, it should meet the requirements of special specifications or procedures.