Click blue to follow The 8-conlay Kempinski Hotel and service apartment project is located at No.8 Jalan conlay, Golden Triangle Center, Kuala Lumpur, Malaysia, adjacent to Pullman hotel in the West and Royal Chulan Hotel in the southeast
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The project is a public building, including basement, podium, tower (tower a, Tower B, tower C), including tower C podium (including 12 floors of inner mezzanine), tower (including 60 floors of transfer floor and machine room)
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The overground building area of building C is 83674 M2 (excluding basement), of which the podium building area from the first floor to the ninth floor is 19372 m2, the area from the ninth floor to the top floor is 64301 m2, and the basement of the fifth floor is used for parking lot
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The whole project of building C is frame shear wall structure, and some beams and slabs are post tensioned prestressed reinforced concrete structure
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The building has three transfer floors, including 10 floors, 32 floors and 51 floors
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The design adopts the construction technology of “thick beam and thin plate”
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The maximum beam thickness is 5m, and the minimum plate thickness is 150mm
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The 1-9 floors are frame structure
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Through the structural transfer of the 10th floor, the shear wall structure is from the 10th floor to the top floor, and the external wall is glass curtain wall structure
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The total building height is 306.9m
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02 construction planning (1) according to the design requirements, the project Department of distributor selection actively organizes the construction from the aspects of mechanical equipment selection, site layout, personnel organization, etc
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the maximum pouring height of the main building is 306.9m, and the diesel concrete pump is selected
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The maximum pumping height is about 400m, which can meet the pumping requirements of the project
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A hgc33a hydraulic inner climbing distributor is selected
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The distributor climbs with the increase of building height to realize the distribution operation of super high-rise concrete pouring
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At least one hydraulic stop valve shall be used for each set of pumping pipeline, and the schematic diagram is shown in the figure above
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Main function of stop valve: horizontal pipeline stop valve facilitates the recovery of waste water residue from pipeline cleaning
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The stop valve is placed at the starting point of the vertical pipeline to avoid the concrete backflow of the vertical pipeline and facilitate the treatment of pumping equipment failure and ground horizontal pipe plugging accident
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The hydraulic power of the stop valve is provided by the hydraulic pump station（ 2） According to the layout plan of the main construction stage of the tower and the requirements of concrete pouring, the concrete pump is arranged on the construction road in the construction site
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The converted length of horizontal pump pipe should be 1 / 5 ~ 1 / 4 of the vertical pumping height, that is, the length of horizontal pipe on the ground is 70m, and the actual length of horizontal pump pipe on site meets the specification requirements
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In order to facilitate the concrete construction of each floor, the vertical pipes are piped according to the floor modulus, so that the pump pipe interface is at the same height of the floor when the concrete is poured in each floor, which is convenient for connecting pipes and pipe joints
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In order to reduce the backflow of concrete due to dead weight pressure when the pump is stopped, and the excessive pressure will affect the working performance of the pump, a turn is set in the pump pipe to reduce the impact of backflow of pressure on the working performance of the pump: an S-bend is set at 100m and 200m of the pump pipe respectively
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The specific selection scheme is shown in the following table: (3) there are three transfer floors in super high-rise transfer floor mass concrete pouring building C, which are 10 floors, 32 floors and 51 floors respectively
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The “thick beam and thin plate” construction technology is adopted in the design, with the maximum beam thickness of 5M and the minimum plate thickness of 150mm
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Due to the large volume of concrete, it is necessary to continuously set up four layers of formwork support (supporting to the l4m floor) to meet the construction needs, The amount of mold base material is large
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It is not conducive to material turnover
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In order to speed up the progress and save the cost of measures, the beam is divided into three areas a, B and C by structural calculation software modeling calculation
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Each area is divided into five times of pouring, and each layer is poured 1 meter, a total of 15 times of pouring
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03 concrete construction process control (1) preparation for pumping construction: before pumping construction, a plan shall be prepared, and the driving route and vehicles shall be arranged reasonably to ensure continuous supply
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Check the instruments and components of the pumping equipment to prevent operation with diseases
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Before pumping, pump about 1m ³ Water to wet pipes, hoppers and concrete tanks; Check the hopper, pump room, delivery pipe and other parts of the pump which are in direct contact with the concrete, and pump 1m after confirming that there is no leakage, blockage and other abnormal conditions ³ Mortar of the same grade; After the pipes are lubricated, the concrete is pumped（ 2） Concrete quality control: the strength grade of the vertical structure of the project is as high as C70, and the strength grade of the beam concrete of the transfer floor is C50, which are all high-strength concrete
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It has the characteristics of short initial setting time, fast setting speed, good fluidity, high viscosity, etc, We need to deal with the following problems: 1) the slump control of super high-rise pumping concrete is particularly critical, too small slump is not conducive to pumping, and the increase of pumping resistance is not conducive to pumping; If the collapse is too large, it is easy to produce segregation due to the high internal pressure of ultra-high pressure pumping
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② For the concrete with the elevation below 100m, it should be controlled according to the conventional concrete construction
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For the concrete between 100m and the top floor, the pump slump should be controlled within 220-260mm, and the slump loss of concrete should be considered
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③ Before ultra-high pumping, the pressure bleeding rate of concrete mixture shall be detected
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During the pumping process, the pressure bleeding rate of concrete mixture shall be measured every 100m ³ The concrete shall be sampled once, and the test results shall meet the requirements of pumping concrete for its pressure bleeding rate
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Concrete pressure bleeding rate ≤ 15%（ 3） Pumping process control every step of super high-rise concrete pumping must be strictly controlled to ensure the smooth pumping of each concrete
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① At the beginning of pumping, the pump should be in a low speed running state
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Pay attention to the pressure of the pump and the working condition of each part
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After pumping smoothly, it can be increased to the normal conveying speed
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② During pumping operation, pay attention to observe the change of main system pressure gauge
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Once the pressure fluctuates abnormally, first reduce the displacement, then reverse the pump 1-2 times according to the situation, and then send the pump
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In the process of high-strength concrete pouring of core tube shear wall, if the concrete supply is interrupted for more than 15 minutes, the pump should be started every 10 minutes in order to prevent the pipe blockage caused by concrete solidification in the pump pipe
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③ According to the concrete performance and construction speed, the maximum working pressure of the hydraulic system of the pump should be adjusted reasonably（ 4） When the concrete conveying height is less than 150 meters, the sponge plug method is adopted
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According to the construction experience, if the sponge plug is still used when the concrete conveying height is more than 150 meters, due to the high pumping pressure, the sponge plug can not completely seal the high-pressure water
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When the water pushing force is not enough to overcome the weight and resistance of the stone, the pipe will be blocked
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At this time, the method of direct water washing should be adopted
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Before water washing, a bucket of mortar should be pumped first, and then clean water should be pumped
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The residual stones will sink into the bottom of the pipeline under the action of self weight and be sucked back to the hopper under the action of high-rise water pressure（ 5） Compared with ordinary buildings, super high-rise concrete structure is in the position of strong wind at high altitude, which is unfavorable to the early maintenance of concrete and easy to cause rapid water loss and cracks
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The concrete curing shall be timely and the curing time shall not be less than 14 days
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If conditions permit, the curing time shall be extended as far as possible.
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