CN111663779A - Closed construction method for metallurgical industry factory building - Google Patents

Abstract

The invention provides a closed construction method of a metallurgical industry factory building, which comprises the following steps: a. constructing a metallurgical industry plant pile foundation; b. constructing a reinforced concrete foundation of a steel structure workshop; c. constructing a steel column and a steel structure roof truss system on a reinforced concrete foundation; d. hoisting and mounting the roof steel structure in place by using a small-tonnage crane; e. installing a crane beam and a crane in the plant, and completing the debugging work of the crane; f. the crane in the factory building is used as a vertical and horizontal transportation tool, and the construction of an equipment foundation and an equipment platform is carried out in the factory building; g. and finally, hoisting and installing the equipment in place by using a crane in the factory building. The method aims to solve the problems that the roof steel structure factory building is hoisted outside, the large-scale hoisting equipment is long in time, high in cost, multiple in up-and-down cross operation and the like. The construction is simple and convenient, fast and easy to realize, and has higher popularization value.

Description

Closed construction method for metallurgical industry factory building

Technical Field

The invention relates to the technical field of metallurgical industry factory building construction, in particular to a closed construction method of a metallurgical industry factory building.

Background

Metallurgical industry plant (high line plant): the main rolling span is provided with a high-speed line equipment platform, and in normal construction, the main rolling span is generally used as a main line, an opening construction process is adopted, a main rolling line is constructed firstly, then an upper steel structure workshop is installed, the steel structure of the workshop is installed outside the span, the large-scale crane is long in spare time, high in cost, more in-and-out cross operation and more in potential safety hazards. The closed construction technology is characterized in that a main rolling span steel structure closed system is installed firstly, a crane is driven in an installation workshop, debugging is completed, and then construction of a concrete platform and a foundation in the workshop is carried out. The transportation problem of reinforcing bar, template and the hoist and mount of equipment foundation and equipment are solved, improve work efficiency. The method is a closed construction method for metallurgical industry plants, and aims to solve the problems that the roof steel structure plants are hoisted outside, large-scale hoisting equipment is long in time, high in cost, multiple in up-and-down cross operation and the like. The construction is simple and convenient, fast and easy to realize, and has higher popularization value.

Disclosure of Invention

The invention aims to provide a closed construction method for a metallurgical industry factory building, and aims to solve the problems that a large-scale hoisting device is long in time, high in cost, multiple in up-and-down cross operation and multiple in potential safety hazard in the existing construction method.

The purpose of the invention is realized by the following technical scheme: a closed construction method for a metallurgical industry plant comprises the following steps:

a. constructing a metallurgical industry plant pile foundation according to design requirements;

b. carrying out steel structure factory building reinforced concrete foundation construction on the pile foundation;

c. constructing a steel column and a steel structure roof truss system on a reinforced concrete foundation;

d. hoisting and mounting the roof steel structure in place by using a small-tonnage crane;

e. after the construction of the factory building is finished, installing a crane beam and a crane in the factory building, and completing the debugging work of the crane;

f. the crane in the factory building is used as a vertical and horizontal transportation tool, and the construction of an equipment foundation and an equipment platform is carried out in the factory building;

g. and finally, hoisting and installing the equipment in place by using a crane in the factory building.

The small-tonnage crane is a crane below 25T.

Compared with the prior art, the invention has the following beneficial effects:

1. the method comprises the steps of firstly installing a main rolling span steel structure closed system, then installing a crane in a workshop, completing debugging, and then constructing a concrete platform and a foundation in the workshop. The transportation problem of reinforcing bar, template to and the hoist and mount problem of equipment foundation and equipment have been solved, work efficiency has been improved.

2. The method is a closed construction method for metallurgical industry plants, and aims to solve the problems that the roof steel structure plants are hoisted outside, large-scale hoisting equipment is long in time, high in cost, multiple in up-and-down cross operation and the like. The construction is simple and convenient, fast and easy to realize, and has higher popularization value.

3. When the invention is constructed, the construction surface in the factory building is large, so that the influence on the construction of the equipment foundation is small, and small-row equipment can freely come in and go out; after the factory building is externally sealed, the influence of rain and snow weather on the construction can be solved in the foundation construction, and the continuity of the construction is ensured; when the equipment is installed, the crane in the plant can be used for hoisting, so that the mechanical cost is saved, the danger caused by up-and-down cross operation and the like is solved, and the danger coefficient is reduced.

Drawings

FIG. 1 is a schematic structural diagram of the plant of the present invention.

In the figure: 1. factory building; 2. a crane; 3. a platform; 4. equipment; 5. and a hydraulic oil tank.

Detailed Description

The technical scheme of the invention is described in detail by taking the construction of a high-line factory building (the length is 81 meters, the width is 33 meters and the height is 18.2 meters) of Xinda project in Qian' an city in Hebei province as an example. The structure of the high-speed wire factory building is shown in figure 1 and comprises a main rolling span and an auxiliary span, wherein the main rolling span is provided with a high-speed wire equipment platform. The engineering construction is divided into four stages:

the first stage is as follows: and (5) constructing a workshop foundation. And according to design requirements, carrying out construction of a plant pile foundation and carrying out construction of a steel structure plant reinforced concrete foundation on the pile foundation.

The main process flow is as follows: paying off → digging earth → clearing groove, trimming slope → drilling exploration, examining groove, foundation treatment → concrete cushion layer → spring line → binding steel bar → form support → concrete independent foundation of pouring → form removal, maintenance → backfill earth → binding steel bar of foundation beam → side form of support beam → concrete of pouring foundation beam → backfill earth.

1. Binding reinforcing steel bar

(1) Checking the steel bar semi-finished product: the semi-finished steel bars are first clamped according to the design drawing and the steel bar process, the specification, the shape, the model and the variety of the semi-finished steel bars are checked, and then the semi-finished steel bars are hung and stacked.

(2) Binding steel bars: the steel bars are bound in sequence, and the steel bars are marked, paved with iron, hooped, bound and finally formed according to the requirements of a drawing during operation.

(3) Pre-burying a pipeline and an iron ring: the reserved holes are correct in position, and the piles extend into the steel bars of the bearing platform and the column dowel bars on the bearing platform and are tied according to the drawing, and are firmly tied or welded. The sizes of the elevation, the position, the lap joint anchoring length and the like are accurate, and omission or displacement is avoided.

(4) Binding a mortar cushion block: the pad under the bottom steel bar is 1 meter in bidirectional distance, and the mortar pad on the side face should be firmly bound with the steel bar and should not be missed.

2. Installation template

(1) Determining a template scheme: the template is a combined steel template or a wood template, and a template installation scheme is determined according to the length of the base side, so that the template is required to be accurate in size and firm in support.

(2) Template pre-inspection: after the template is installed, the cross section size, elevation, split bolts, connecting rod supports and the like are subjected to pre-inspection, and the requirements are in accordance with the regulations of design and quality standards.

3. Pouring of concrete

(1) Stirring concrete: the weights of cement, sand and gravel and the amount of the additive were weighed out according to the mix ratios given in the laboratory. When the vehicle is used for weighing, the stones are poured firstly, then the cement is poured, then the sand is poured, and the water is added for stirring. The admixture and water are added together.

(2) Vibrating: the inclined vibrating method is adopted along the pouring sequence direction, the inclination angle of the vibrating rod and the horizontal plane is about 30 degrees, the rod head moves forwards, the distance between the inserted rods is preferably 50cm, and the leakage vibration is prevented. The vibration time is based on the air bubbles generated by the slurry turning of the concrete surface. The surface of the concrete is rubbed with a wooden trowel and compacted with an iron trowel according to the marked height line with vibration.

(3) And (5) maintenance: after concrete is poured, covering and watering for curing within 12 hours at normal temperature, wherein watering frequency is preferably used for keeping the concrete moist, and curing time is not less than 7 days.

And a second stage: construction of a factory building structure and installation of the factory building structure. And (5) constructing a steel structure roof truss system and installing a roof steel structure and a crane beam.

1. Manufacture of steel structure

(1) Steel column manufacturing process flow

Batching → material marking → cutting → part processing → edge planing → assembling rib plate → welding → marking → inspection → brushing oil (reserving marking) → handing and signing in the certificate.

(2) Crane beam manufacturing process

Batching → leveling of steel plate → butt joint of steel plate → automatic submerged arc welding → ultrasonic testing → material marking → cutting → part straightening → edge planing → assembling I-beam → automatic submerged arc welding → ultrasonic testing → I-beam straightening → assembling rib plate → manual electric welding → straightening → drilling → marking → checking → brushing oil (keeping marking) → handing and signing for certification.

(3) Roof truss manufacturing process flow

Batching → material correction → material marking → cutting → material receiving → welding → part correction → drilling → group fitting → manual electric welding → correction → sign → inspection → oil brushing (sign keeping) → delivery signing for the certification.

1. Steel column hoisting

Generally, a steel column is hung in a straight way, a lifting lug is arranged at the top of the column, and the column body is vertical, so that centering and correction are easy; the hoisting point can also be placed at 1/3 of the column length, and the steel column is inclined, so that the centering and correction are not convenient; for the slender steel column, two points or more may be employed in order to prevent deformation of the steel column.

If the hoisting is to directly bind the steel wire rope to the steel column, the steel wire rope is prevented from being cut off by paying attention to wrap corners at four corners of the steel column; at the ligature department, for preventing the local extrusion of steel column and destroying, multiplicable reinforcing plate increases the bracing piece to the lattice column.

Before hoisting, the foundation plate is cleaned up, an operator stands at the position of the steel column after hoisting the steel column to the upper part of the foundation, the column base is stabilized and positioned on the foundation plate, the falling hook is stopped when the column is descended to the foundation plate, the column is pried by a crowbar, the center line of the column base is aligned, and after the alignment of the column base and the axis of the foundation plate is checked, the column base is immediately spot-welded and positioned. If the column base is welded with the connecting plate, after the crane aligns the steel column connecting plate with the foundation bolt, the steel column falls to the surface of the foundation plate, and the steel column is fixed immediately by the nut.

2. Crane beam mounting

The crane beam is generally installed by adopting a tool type lifting lug or a binding method. Before installation, marks are marked on the parts of the crane beams to be led to the ends of the crane beams so as to be beneficial to temporary positioning according to the fixed axis of the column bracket during hoisting.

The straightening of the steel crane beam includes elevation adjustment, longitudinal and transverse axes (including straightness and track gauge) and perpendicularity.

Elevation adjustment: after the hoisting of the two rows of crane beams in one span is finished, a level gauge (with the precision of +/-3 mm/km) is used on the beams or a platform specially erected, the elevation of two ends of each beam is measured, and a standard value is calculated. The adjustment is carried out by adding a backing plate, so that the standard requirement is met.

Straightening longitudinal and transverse axes: firstly, guiding a correct axis of a column base at the end part in each axis row to the horizontal position of the top of a bracket by using a theodolite, and determining the distance between the correct axis and the central line of a crane beam; a through long steel wire (or theodolite) is pulled on the central line of the top surface of the crane beam to carry out adjustment one by one. And when the two rows of longitudinal and transverse axes meet the requirements, rechecking the span of the crane beam.

Vertically correcting a crane beam: and hanging the hammer ball from the upper flange of the crane beam, and measuring the distance from the rope to the upper part and the lower part of the beam web. According to the inclination degree of the beam, the wedge iron block is used for adjusting to enable the plumb bob and the web plate to be equal up and down. The longitudinal and transverse axes and the perpendicularity can be performed simultaneously. The time for correcting the heavy crane beam is preferably carried out after the roof is hoisted.

3. Roof truss hoist and mount

During hoisting, the hoisting member is hoisted to the position specified by the design drawing, and the lifting hook is loosened after preliminary correction and firmness. The specific operation is as follows:

firstly, hoisting a first roof truss. When the roof truss is hoisted, the transverse rod pieces are additionally arranged on the roof truss, so that the rigidity during hoisting is enhanced, and the damage during hoisting is prevented. And (3) hoisting the assembled roof girder in place by a four-point hoisting method, aligning the roof truss to the center of the installation position when the roof truss is hoisted to about 50cm away from the ground, hoisting the roof truss to 50cm away from the top mark of the column, then downwards placing the hook, and aligning the central line of the support to the standard central line placed on the top of the column. And (5) performing temporary fixation, and fixing according to the drawing requirements after the alignment is to be corrected. The first roof truss is fixed by a wind rope to prevent the first roof truss from inclining, and the return hook continues to install the next roof truss. And then hoisting a second roof truss. After the roof is hoisted in place by the method, roof purlines and supports are installed, so that the first roof truss and the second roof truss form a whole, and the rigidity of the whole structure is improved. And (4) hoisting the roof trusses by the method from the third roof truss until the whole hoisting is finished.

4. Profiled steel sheet installation

The tile hanging project of the profiled steel sheet of the engineering main workshop has higher installation requirement and plays an important role in the overall appearance quality of the project. The hanging tile installation belongs to high-altitude operation, and safety protection is very important, and reliable measures are required to be taken to ensure safety and construction quality.

Processing, transporting and stacking profiled steel sheets: the profiled steel sheet is manufactured by on-site processing, the profiled steel sheet wall tiles are stacked according to the plate types, specifications and use positions respectively, the profiled steel sheet wall tiles are built on the air by adopting wood beams lined with rubber pads, the spacing between the wood beams is not more than 3m, at most three layers can be stacked, 5-10 profiled steel sheets are stacked in each layer, and the profiled steel sheet roof tiles are directly transported to a roof for installation without being cut off after being pressed on site.

And a third stage: and constructing equipment foundations, building envelopes and other auxiliary parts. The crane in the factory building is used as a vertical and horizontal transportation tool, and the construction of an equipment foundation and an equipment platform is carried out in the factory building.

Equipment foundation construction operation process

(1) The equipment foundation is complex in modeling, a large number of foundation bolts, water, electricity, wind, oil and lubricating pipelines are buried in the foundation, the working procedures are multiple, and the matching is complex. The general procedure for installing the reinforcing steel bars is as follows: the bottom plate steel bars are installed before the side molds are erected; the outer side steel bars are installed after the outer wall formwork is installed; the foundation inner side steel bar is installed or inserted before the inner formwork is erected; various water, ventilation, oil pipes, cable conduits and conduits for automatic devices buried in the foundation must be installed before the installation of the reinforcing bars.

(2) And (4) counting the installed reinforcing steel bars one by one, transporting the formed reinforcing steel bars to the installation part of the foundation pit according to the sequence of reinforcing steel bar binding materials, and horizontally dispersing and binding in sequence.

(3) In order to make the bound reinforcing steel bar grids square and uniform and the space and size are correct, marking on a cushion layer or a template or binding by adopting a 5m long caliper (or a reinforcing steel bar comb), firstly, clamping the reinforcing steel bars at two ends by using the notches of the calipers, and removing the calipers after the reinforcing steel bars are firmly bound to form the mesh with the required space; the wall (vertical) reinforcing steel bars are controlled by angle steel rods.

(4) Adopt M20 cement mortar to make the prefabricated cushion block of band iron wire of different thickness, at reinforcing bar bottom or found wall reinforcing bar side according to certain distance ligature cushion block to the protective layer of control reinforcing bar avoids down warping, guarantees to level.

(5) The horizontal reinforcing mesh on the upper layer of the foundation is usually suspended and placed, so that the elevation is large, the height difference is large, the shape is complex, and the weight of a single reinforcing steel bar is large, so that the single reinforcing steel bar is generally bound directly. The support welded by section steel or phi 25 steel bars is adopted to support the weight of the upper layer of steel bar net and the construction load of the upper operation platform. An oblique support is arranged between the bracket and the upright post.

(6) After the reinforcing steel bars are installed, sundries and sludge on the bottom plate and the reinforcing steel bars are cleaned, self-checking records are extracted, special checking and checking are carried out, necessary finishing is carried out finally, and the next procedure of concrete pouring can be carried out after the handover procedure is finished.

A fourth stage: and (4) mounting the electromechanical equipment.

Hoisting and installing equipment in place by using a crane in a factory building, and installing equipment such as a sintering machine and the like basically follow the sequential installation from bottom to top.

Claims (2)

1. A closed construction method for a metallurgical industry factory building is characterized by comprising the following steps:

a. constructing a metallurgical industry plant pile foundation according to design requirements;

b. carrying out steel structure factory building reinforced concrete foundation construction on the pile foundation;

c. constructing a steel column and a steel structure roof truss system on a reinforced concrete foundation;

d. hoisting and mounting the roof steel structure in place by using a small-tonnage crane;

e. after the construction of the factory building is finished, installing a crane beam and a crane in the factory building, and completing the debugging work of the crane;

f. the crane in the factory building is used as a vertical and horizontal transportation tool, and the construction of an equipment foundation and an equipment platform is carried out in the factory building;

g. and finally, hoisting and installing the equipment in place by using a crane in the factory building.

2. The metallurgical industry plant closure construction method according to claim 1, wherein the small tonnage crane is a crane below 25T.

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