CN103774856B - A kind of gliding construction method of different shape heavy type girder steel of large span on Super High roofing - Google Patents

Abstract

The invention discloses a sliding construction method of a large-span abnormal-shaped heavy-duty steel beam on a super-high-rise roof, comprising the following steps: installing a slideway preconditioner; installing a slideway preconditioner; lifting a frame body by a tower crane; erecting a support frame body ; Assemble the steel beam in sections; Weld the two connecting rods; Remove the beam bottom support and tire frame; Install the slideway and propeller; Install the hydraulic control system; Debug the propeller control system; The position of the partial steel beam; weld the column feet on both sides of the steel beam; repeat the above to slide the third steel beam; remove the slideway and propulsion system; remove the steel beam support frame. The invention has beneficial effects: the method adopts the construction technique of hoisting the segmented steel structure to the roof with a tower crane, welding and assembling steel beams on the roof, and then sliding the steel beam as a whole, which solves the problem that the tower crane cannot lift large pieces at high altitude.

Description

A sliding construction method of long-span abnormal-shaped heavy-duty steel beams on super-high-rise roofs

technical field

The invention relates to a sliding construction method of a large-span abnormal-shaped heavy-duty steel beam on a super-high-rise roof, and belongs to the technical field of building construction.

Background technique

With the development of the national economy and the continuous improvement of people's living standards, the works of architects are becoming more and more colorful and full of personality, especially the unique appearance and top design of the roof. The architectural design of this project is the American NBBJ design firm, and the appearance is 5 large ships set sail by Yang Fan. Due to the effect of the building facade, the design requires that the steel structure beams of the roof be heavy-duty steel beams, and the shape is particularly complicated, which brings great difficulties to the construction. Traditional construction methods cannot meet the design requirements, and new technical means need to be sought to solve the problems faced.

The top of the roof targeted by this method is equipped with five large-span special-shaped heavy-duty steel beams (total weight 650 tons). The beams are all-steel structures with a cross-section of 0.8m×1.5m. The box girder is 1.210 tons/m, the maximum weight of a single steel beam is 108 tons, the maximum span is 52m, and the height of the steel beam is 20m to 16.7m. The steel structure beam adopts the overall sliding construction technology.

Contents of the invention

The purpose of the present invention is to solve the problems existing in the prior art, and provides a sliding construction method of large-span abnormal-shaped heavy-duty steel beams on super-high-rise roofs.

In order to achieve the above object, the technical scheme of the present invention is as follows:

A sliding construction method of large-span abnormal-shaped heavy-duty steel beams on super-high-rise roofs is characterized in that it includes the following steps:

Install the slideway prefab;

Tower crane lifting frame body;

set up a support frame;

Sectionally assembled steel beams;

Weld two connecting rods;

Remove the beam bottom support and tire frame;

Install slides and propellers;

Install hydraulic control system;

Debug thruster control system;

The steel beam slides to the design position;

Correct the position of the deflection steel beam;

Column feet on both sides of the welded steel beam;

Repeat above to slide the third steel beam;

Dismantling of slideway and propulsion system;

Remove the steel beam support frame body.

As a preferred solution, in step A), the center line of the sliding track coincides with the center line of the steel frame support, so as to reduce the adverse effect of the truss support on the truss support during the sliding process due to eccentric force; the sliding track is selected from 200X200 thermal Rolled H steel + 16# channel steel, the material is Q235B, the H steel is welded with 12mm thick rib plate at a distance of 500mm, and the side baffle of the sliding track is fixed with the embedded parts, and the specification of the side baffle of the track is -12×50 ×75mm steel plates are arranged symmetrically on both sides of the sliding track with a spacing of 1000mm, which serves to reinforce the flange of the H steel and resist the possible lateral thrust at the sliding support. The beneficial effects of the present invention are mainly reflected in: compared with the traditional structure, the rigid damping structure increases the cost of the energy dissipation element, but the amount of steel bar, section steel and concrete are all reduced.

This method uses the tower crane to hoist the segmented steel structure to the roof, weld and assemble the steel beams on the roof, and then the steel beams slide as a whole, which solves the problem that the tower crane cannot lift large parts at high altitudes; Steel structure beams, nearly 650 tons of steel structure installation in a single building took only 40 days to complete the installation, which is 10 days less than the planned construction period; compared with traditional whole-frame hoisting and truss sliding, this method reduces material waste , saving about 20 tons of steel, calculated at 5,000 yuan/ton, saving 100,000 yuan in cost; saving about 500 labor in 10 days, saving 125,000 yuan in labor costs at 250 yuan/person; saving 225,000 yuan in total for each building, A total of 900,000 yuan was saved for the four buildings.

Description of drawings

Figure 1 is a flow chart of the method of the present invention.

detailed description

The technological principle of the present invention is that the steel girder components are assembled and welded at effective positions, and the supporting frame is removed after each steel girder is formed to slide to the designed position.

The basic structure of steel beams is

1. Pre-embed the steel plate for fixing the slideway according to the position of the roof steel beam. The thickness of the steel plate is t=8mm and the width b=400mm.

2. According to the height, shape and width of the special-shaped steel beams on the roof, bowl-shaped steel pipes are used to build the support frame to meet the pressure and safety requirements, and pass the professional inspection. When assembling the steel girders according to the shape of each girder, the maximum hoisting weight of the tower crane is 5.5 tons, and each girder needs to be hoisted 21 times. Designed as a secondary weld, 20% flaw detection. After qualified, the rust removal and finishing paint treatment on the weld seam shall be carried out. Remove the supporting trusses.

3. Install the slides on both sides, check the stability of the slides, set the slope to -1~2mm, install the slide shoes, cut off the web of the steel beam column foot, and set the space from the ground.

4. Install 5 sets of hydraulic jacks and hydraulic operating system, and the debugging equipment starts to slip into place.

5. Correction is carried out after it is in place, and the cut-off web plate is replaced to weld the beam foot, and finally the steel beam support frame is removed.

Referring to accompanying drawing 1, the present invention specifically comprises the following steps:

A) Install the slideway prefab;

B) The tower crane lifts the frame body;

C) set up a support frame body;

D) Assembling steel beams in sections;

E) welding two connecting rods;

F) Remove the beam bottom support and tire frame;

G) Install slides and propellers;

H) Install the hydraulic control system;

1) debugging the thruster control system;

J) The steel beam slides to the design position;

K) correcting the position of the deflection steel beam;

L) Column feet on both sides of the welded steel beam;

M) Repeat above to slide the third steel beam;

N) Dismantle slideway and propulsion system;

O) Remove the steel beam support frame body.

The main points of operation of the present invention are:

1. Slide design and construction

1-1. The slideway acts as a load-bearing guide and laterally restricts the horizontal displacement of the slide during the entire horizontal ejection.

1-2. For a single steel frame, a total of 3 slideways are set.

1-3. The 800mm-thick concrete beam slab on the roof will be used as the sliding support for the sliding. The slideways are mainly arranged on the roof surface and arranged along the entire length.

1-4. The slideway is set with 200X200H steel + 16# channel steel, the notch of which is upward, and the lower surface of H steel is fixed on the roof by intermittent welding, which is specially used for sliding embedded parts.

1-5. Considering that the lower slideway must be removed during the falling process of the steel frame, the slideways between the steel frames are divided into several sections and assembled through temporary connections.

1-6. Ensure the smoothness of the slideways between the joints to ensure the stability of the push-up of the composite beam during the sliding process.

2. Slide installation

2-1. The sliding track structure plays the role of bearing, guiding and laterally limiting the horizontal displacement of the support during the sliding process of the roof steel structure.

2-2. The centerline of the sliding track should coincide with the centerline of the steel frame support as much as possible, so as to reduce the adverse effects of the eccentric force on the truss support during the sliding process.

2-3. The sliding track is made of 200X200 hot-rolled H steel + 16# channel steel, and the material is Q235B. The H steel is welded with 12mm thick ribs at a distance of 500mm, and is fixed by the side baffle and embedded parts of the sliding track.

2-4. The side baffles of the track are made of steel plates with a specification of -12×50×75mm, which are arranged symmetrically on both sides of the sliding track with a distance of 1000mm, which serves as a reinforcement for the H steel flange and a sliding support Possible side thrust effect.

3. Slider design

3-1. Use the flange plate of the steel frame beam to set the slider, one on each side, and one set of sliding devices on the top of the middle bracket of the middle steel frame. There are 3 sliding stations in this project.

3-2. The sliders on both sides are set in a "sled" type, and the front part is made into a type with a certain radian. Through the above design, it can effectively prevent the sliding bearing from being stuck on the "rail" due to the unevenness of the slideway.

3-3. In addition, the straightness of the slideway installation and the control of the center distance of the slideway are all to prevent the phenomenon of "rail jamming" and "rail gnawing". The process inspection should be strictly carried out during the on-site construction process.

4 push point types

4-1. The front end of the hydraulic pusher is connected and fixed with the lug plate on the pushed member through the pin shaft, so as to transmit the horizontal sliding push force.

4-2. The thickness of the connecting ear plate is 20mm, and the material is Q345B.

4-3. In this project, the connecting lugs are pre-installed near the bottom of the sliding support, and two connecting lugs are installed at each push point.

4-4. The connecting ear plates are welded to the steel frame wing plates respectively, and the weld seam height is 8mm.

5. Optional hydraulic equipment for jacking

5-1. Satisfy the requirements of the theoretical slip reaction force at each jacking point of the roof steel structure, and try to make each hydraulic jacking unit loaded evenly.

5-2. Try to ensure that the number of hydraulic equipment driven by each hydraulic pump source system is equal, and the length of the oil pipe is consistent to reduce the delay effect.

5-3. In the overall control, the safety and reliability of the hydraulic synchronous sliding system should be carefully considered to reduce engineering risks.

6. Slip synchronous control

6-1. Try to ensure that the configuration coefficients of hydraulic sliding equipment at each sliding push point are basically consistent;

6-2. The stability of the sliding structure should be ensured so that the sliding unit structure can be correctly positioned, that is to say, it is required to maintain a certain degree of synchronization during the sliding process of each pushing point.

6-3. Set the sliding speed and stroke displacement value of one of the five hydraulic thrusters (master point) of each sliding cluster as the standard value, as the benchmark of speed and displacement in the synchronous control strategy .

6-4. Under the control of the central control pump, the remaining 4 hydraulic pushers track and compare the main command point with their respective displacements, and dynamically adjust according to the difference ΔL in displacement between the two points to ensure that each pusher Points are always kept in sync during sliding.

6-5. The theory of determining a straight line through two points ensures the synchronization and stability of the roof steel structure grouping during the entire sliding process.

7. Debugging of hydraulic jacking and sliding system

7-1. Structural status inspection of temporary measures at the push point and driven slip point;

7-2. Check the reinforcement of the roof steel structure, the strength, stability and deformation of the frame.

7-3. Whether the debris in the slideway is clear and whether the butter is applied.

7-4. Check and remove obstacles that may affect the sliding process.

7-5. Check whether the joints of all valves or oil pipes on the hydraulic pump station are loose, and check whether the pressure regulating spring of the overflow valve is completely relaxed.

7-6. Check whether the connection of the power line and communication cable between the control cabinet of the hydraulic pump station and the hydraulic pusher is correct.

7-7. Check whether the oil pipe connection between the hydraulic pump station and the main oil cylinder of the hydraulic pusher is correct.

7-8. When the system is powered on, check whether the rotation direction of the main shaft of the hydraulic pump is correct.

7-9. When the hydraulic pump station does not start, manually operate the corresponding button in the control cabinet to check whether the action of the solenoid valve and the stop valve is normal, and whether the number of the stop valve corresponds to the number of the hydraulic pusher.

7-10. Check the stroke sensor and make the corresponding signal light in the local control box send out a signal.

7-11. Inspection before sliding: Start the hydraulic pump station, adjust a certain pressure, extend the main cylinder of the hydraulic pusher: check whether the oil pipes in chamber A and chamber B are connected correctly; check whether the stop valve can stop the corresponding oil cylinder.

8. Graded loading test slip

8-1. After the hydraulic jacking system equipment is tested correctly, start to try sliding. After calculation, determine the cylinder extension pressure (considering pressure loss) and cylinder retraction pressure required by the hydraulic pusher.

8-2. When the sliding test starts, the pressure of the extension cylinder of the hydraulic jack is gradually increased, which is 20% and 40% of the required pressure in turn. When everything is normal, it can continue to be loaded to 60%, 80%, 90%, 95%, 100%.

8-3. When the roof steel structure sliding unit starts to move, the jacking operation is suspended, and the pressure of the hydraulic jacking equipment system is maintained. Carry out a comprehensive inspection of hydraulic ejectors, equipment systems, and structural systems.

8-4. Only when it is confirmed that the stability and safety of the overall structure have absolutely no problems can the formal push and slide begin.

9. Main points of sliding process control

9-1. After all the preparatory work is completed, and after a systematic and comprehensive inspection is correct, the general commander of the on-site skidding operation will check and issue an order before the formal skidding operation can be carried out.

9-2. During the hydraulic sliding process, pay attention to observe the pressure and load changes of the equipment system, and carefully record the work.

9-3. During the sliding process, the measuring personnel should cooperate with the steel tape to measure the accurate value of the displacement of each traction point, so as to assist in monitoring the synchronization of the sliding process of the sliding unit.

9-4. During the sliding process, pay close attention to the working status of the slideway, hydraulic pusher, hydraulic pump source system, etc.

9-5. All operators on site must ensure smooth signal and unified command.

10. Pre-slip

10-1. After the installation of the hydraulic sliding equipment system is completed, the system debugging is carried out first, and all the procedures are ready and checked, and the roof sliding is started.

10-2. The initial sliding unit is the first outermost ZGJ1 steel frame, weighing about 100 tons. The loading steps are 40%, 60%, and 80% of the required pressure according to the initial pressure of the crawler. When everything is stable case, it can be added up to 100%. Pause after the steel frame has just started to move.

10-3. Comprehensively check the normal operation of each equipment: changes in the clamping device of the crawler, the sliding track and the stress on the truss. Under normal circumstances, the sliding can be officially started.

11. Formal slip

11-1. Pre-set the pump source pressure value according to the design slip load, thereby controlling the maximum output thrust of the crawler to ensure the safety of the entire slip facility.

11-2. During the sliding process, the surveyors should cooperate with the steel tape to measure the accurate value of the displacement of each sliding point.

11-3. During the sliding process, the surveyors should cooperate with the steel tape to measure the accurate value of the displacement of each sliding point.

11-4. The control system feeds back the distance signal through the sensor to control the error of the two sets of crawlers within 10mm, thereby controlling the synchronous sliding of the entire truss.

11-5. There is basically no horizontal horizontal force on the sliding steel frame, and the calculation of the force on the steel frame support under the sliding condition is safe. The steel frame is equipped with a horizontal stopper corresponding to the track position, and the entire sliding process is safe and reliable.

11-6. The crawler is a hydraulic system. Through flow control, the acceleration of the crawler's start and stop is almost zero, and the impact on the track is very small.

12. Slip process observation

12-1. Observe the synchronous displacement sensor to monitor the sliding synchronous situation.

12-2. The position of the support and the track.

12-3. Clamping status of crawler clamping device and track.

12-4. When accumulating once, whether the propulsion conversion value is normal.

In summary, these are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes and modifications are made in accordance with the shape, structure, characteristics and spirit described in the scope of the claims of the present invention. , should be included in the scope of the claims of the present invention.

Claims (1)

1. gliding construction method of a kind of large span different shape heavy type girder steel on Super High roofing, it is characterised in that including as follows Step：

A) slideway built-in fitting is installed；

Ramp design：

1-1, slideway play load-bearing and are oriented to and laterally limit slide plate level displacement in whole horizontal ejection；

1-2, for single Pin steelframes, altogether set 3 slideways；

1-3, sliding will be supported using roof 800mm thickness concrete beam plates as sliding, and slideway is mainly arranged in roof surface, and leads to Length is arranged；

1-4, slideway are configured using 200X200 hot rolling H steel+16# channel-section steels, and upwards, H steel lower surface passes through intermittent weld to its notch Roofing is fixed on dedicated on sliding built-in fitting；

1-5, in view of steelframe during the frame that falls, bottom slideway must be removed, therefore the slideway between each steelframe is divided into some sections It is combined by interim connection；

Fairing between 1-6, each joint of guarantee between slideway, to ensure combination beam pushing tow stability in slipping；

Slideway is installed：

2-1, sliding rail structure play load-bearing, are oriented to and laterally limit bearing horizontal position in layer Steel Structure slipping The effect of shifting；

2-2, sliding rail center line should try one's best and be overlapped with steelframe bearing center line, with truss support in reducing slipping because receiving Have a negative impact to eccentric force；

2-3, sliding rail use 200X200 hot rolling H steel+16# channel-section steels, and material is Q235B, and H steel welds 12mm by spacing 500mm Thick gusset, is fixed using the side shield and built-in fitting of sliding rail；

It is the steel plate of -12 × 50 × 75mm that 2-4, the side shield of track use specification, is symmetrical arranged in sliding rail both sides, spacing It is 1000mm, plays a part of to reinforce the H steel edge of a wing and resist possible lateral thrust at slip support abutment；

Slider designs：

3-1, sliding block is set using steelframe beam flange plate, per side 1, middle steelframe middle bracket top sets 1 group of slide device, altogether 3 sliding stations are set；

3-2, two side slides are arranged to Sledge type, and its front portion is fabricated into the pattern with certain radian；

3-3, the straight degree of slideway installation, the control of slideway centre-to-centre spacing are all the phenomenon generations for preventing clamp rail and gnawing rail, and scene is applied Process inspection is carried out during work；

B) tower crane handling support body；

C supporting frame) is set up；

D) merogenesis assembling girder steel；

E two Pin connecting rods) are welded；

F the support of beam bottom and moulding bed) are shed；

G) installation propeller：

1-1, hydraulic top thruster front end are attached fixation by bearing pin with the otic placode being passed on component, are used to transmit level cunning Move jacking force；

1-2, connection otic placode thickness are 20mm, material Q345B；

In advance near slip support abutment bottom, each pushing tow point sets two pieces of engaging lugs for 1-3, connection otic placode；

1-4, connection otic placode are welded to connect with steelframe wing plate respectively, and weld bead height is 8mm；

H) hydraulic control system is installed：

1-1, ensure each sliding pushing tow point hydraulic pressure slip device configuration coefficients it is basically identical；

1-2, ensure the stabilization of Sliding Structures so that sliding element structure can be correctly in place, namely require that each pushing tow point slid Certain synchronism can be kept in journey；

1-3, by every time sliding cluster 5 hydraulic top thrusters in one sliding velocity and travel displacement value be set as standard Value, as Strategy For Synchronization Control medium velocity and the benchmark of displacement；

1-4, under the control of central controlling pump, remaining 4 hydraulic top thruster tracked with respective displacement respectively comparison master Make a little, the difference Δ L according to point-to-point transmission displacement enters Mobile state adjustment, it is ensured that each pushing tow point remains same in slipping Step；

1-5, the theory that straight line is determined by 2 points, it is ensured that layer Steel Structure is grouped in the synchronism in whole slipping And stability；

I propeller control system) is debugged；

J) girder steel is slid onto design attitude：

1-1, after examination sliding is started after the detection of hydraulic pushing system equipment, determine to stretch cylinder pressure and contracting cylinder needed for hydraulic top thruster Pressure；

1-2, start examination sliding when, hydraulic top thruster is stretched cylinder pressure and is gradually raised, and is followed successively by the 20% of required pressure, 40%, after It is continuous to be loaded into 60%, 80%, 90%, 95%, 100%；

Suspend pushing tow operation when 1-3, layer Steel Structure sliding element just begin with mobile, keep hydraulic pushing device systems pressure Power, is checked hydraulic top thruster and device systems, structural system comprehensively；

1-4, in the case where confirming that integrally-built stability and security are no problem definitely, formal thrusting slip could be started；

Slipping key control point：

1-1, after all preparations are finished, and by system, comprehensively check it is errorless after, scene sliding operation always refer to Wave after checking and issuing an order, just can formally be entered line slip operation；

1-2, in hydraulic pressure slipping, splash pressure, the loads change situation of device systems, and conscientiously make a record work Make；

1-3, in slipping, survey crew should be by the exact value of each towing point displacement of steel tape conjunction measuring, with auxiliary Help the synchronism of monitoring sliding element slipping；

Slideway, hydraulic top thruster, the working condition of hydraulic pump source system should be kept a close eye in 1-4, slipping；

Pre- sliding：

After 1-1, hydraulic pressure slip device system installation, first carry out system debug, every operation it is all ready and on inspection without By mistake, propulsion roof system sliding is started；

2-2, initial slippage unit are a Pin outer most edge ZGJ1 steelframes, weigh about 100 tons, and load step initially adds according to crawl device 40%, 60%, 80% of the pressure for needed for is pressed, is suspended after steelframe just begins with displacement；

3-3, each equipment normal operation situation is checked comprehensively, the change feelings of crawl device clamping device, sliding rail and truss stress It is formal after condition to start sliding；

Formal sliding：

1-1, according to design the pre-set pump outlet pressure value of slip-load, thus control crawl device maximum output thrust, it is ensured that The safety of whole sliding facility；

1-2, in slipping, survey crew should be by the exact value of each creep setpoint displacement of steel tape conjunction measuring；

1-3, control system control two groups of crawl device errors in 10mm, so as to control whole by sensor feedback distance signal The synchronization-sliding of individual truss；

1-4, sliding steelframe are safety, steelframe correspondence substantially without steelframe calculation support under transverse horizontal force, and slip condition Orbital position sets horizontal block；

1-5, crawl device are hydraulic system, and by flow control, the startup of crawl device, acceleration at stall are to the impulsive force of track It is small；

Slipping is observed：

1-1, observation synchronous displacement sensor, monitor sliding synchronization situation；

1-2, bearing and track screens situation；

1-3, crawl device clamping device and railway clamping situation；

1-4, accumulation one time when, whether propulsive force transformed value normal；

K the inclined steel beam position of correction) is entangled；

L) welded steel beam two side columns leg；

M the 3rd girder steel is slid more than) repeating；

N slideway and propulsion system) are removed；

O girder steel supporting frame) is removed.