WO2018214144A1

WO2018214144A1 - Construction control method for 3.3 m thick raft foundation for super high-rise housing project

Info

Publication number: WO2018214144A1
Application number: PCT/CN2017/086088
Authority: WO
Inventors: 宋陈明
Original assignee: 南通八建集团有限公司
Priority date: 2017-05-26
Filing date: 2017-05-26
Publication date: 2018-11-29

Abstract

A construction control method for a 3.3 m thick raft foundation for a super high-rise housing project, comprising preparation before concrete pouring, and implementation of concrete pouring. For concrete pouring, an inclined plane delamination method is used; surface anti-cracking implementation is required to be performed after concrete pouring and before pre-hardening; the surface temperature of the concrete and the structure central temperature must be monitored after concrete pouring; corresponding measures are taken to control the difference between the internal and external temperatures and the temperature drop rate of a concrete pouring block, so as to prevent harmful temperature cracks from occurring in the concrete.

Description

Super high-rise residential project 3.3m thick raft foundation construction control method

[0001] The present invention relates to a 3.3 m thick raft foundation construction control method for a super high-rise residential project.

Background technique

[0002] Under the action of cement hydration heat, large volume enthalpy will produce higher hydration heat temperature rise, forming uneven unsteady temperature field, resulting in non-uniform temperature deformation, temperature deformation in the lower structure and its own constraints. Underneath will generate large temperature stress, which is easy to cause splitting. The foundation floor is the load-bearing structure of the whole main building. Once it is cracked, it not only affects the safety of the building, but also the water seepage of the floor will affect the normal use and durability of the building. technical problem

[0003] The object of the present invention is to provide a 3.3 m thick raft foundation construction control method for a super high-rise residential project with convenient construction and good effect.

Problem solution

Technical solution

[0004] A super-high-rise residential project 3.3m thick raft foundation construction control method, characterized by: including the following steps [0005] (1) 砼 pre-casting preparation

[0006] (1) Check the reserves of raw materials of suppliers, the supply capacity of cement, admixtures, and miscellaneous materials suppliers, and seal the cement and admixtures, half a month before the construction of large-scale concrete. To ensure the supply and quality requirements of large-volume raw materials;

[0007] (2) Equipped with two generator sets to prevent power failure of the external network;

[0008] (3) Machinery, vehicle equipment

[0009] equipped with six sputum pumps, one of which is spared, and the maximum enthalpy output per raft of the pump is 50m 3 ;

[0010] (4) transporting the curing cover material to the vicinity of the foundation pit to ensure sufficient maintenance or heat preservation during the condensing and curing process;

[0011] (2) 砼 pouring construction

[0012] (1) Pouring construction process [0013] Arrangement 砼 car pump → 砼 supply acceptance → smashing machine, pumping mortar, running pipe → pouring 砼 → vibrating → recycling operation → 砼 surface first leveling, squeezing → 砼 surface secondary leveling, Compaction, trowel → third inspection before the final condensation, early shrinkage cracks and then smearing the surface → and 吋 cover insulation moisturizing maintenance → 砼 temperature monitoring;

[0014] (2) Pouring method

[0015] The concrete pouring is started from the lower part by the slope layering method, and rises layer by layer; the inclined surface is formed by the natural flow of the pumping, the slope is controlled at about 1:8, and the vibrating work starts from the bottom layer of the pouring layer. Move to ensure the quality of construction between layers;

[0016] In the process of vibrating, the vibrating bar is slightly twitched up and down, so that the upper and lower jaws are evenly vibrated, and each time the vibrating is between 20 and 30 s, the bubble is no longer present on the surface of the crucible, and the mortar is released;砼捣捣捣 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The first line is arranged at the discharge point to make the concrete form a natural flow slope. The second line is arranged at the foot of the slope to ensure the lower part of the slope. The third line is arranged in the middle of the slope. The points on the slope are strictly controlled. , moving distance and insertion depth;

[0017] (3) bleeding treatment

[0018] According to the construction running water during construction, most of the bleeding water is discharged into the sump and the elevator pit, and then drained by the submersible pump, and a part of the bleeding is treated by sponge suction;

[0019] (4) Surface crack prevention construction

[0020] Due to the thick cement slurry on the surface of the large volume pumping, it must be used before the initial setting after the pouring, in order to close the water-collecting crack of the crucible, and the surface treatment of the crucible is first compacted by the tool surface according to the surface elevation, and the long scraper is used. Secondly, it should be rolled and rolled several times before the initial setting by the pressure roller. Finally, before the final setting, check the early shrinkage of the cockroach. The wooden crab is sanded and compacted to close the water. Cracks, during the construction of the squeezing and solidification, the surface of the finishing work must be synchronized and covered with a surface protection layer;

[0021] (5) Maintenance

[0022] Within 12 hours after the pouring, the lid is covered with water and moisturized, and the maintenance cover is covered with a layer of film and a layer of 50mm polystyrene board. According to the temperature measurement, the closed color cloth is matched.吋Uncovering, the lap joint of the colored cloth is required to be no less than 150mm. The narrow space between the wall columns and the ribs must pay special attention to the insulation measures. After covering with the strip film, cover the insulation quilt to ensure the weak link of the wall column. Insulation work;

[0023] (6) Temperature measurement work of 砼 [0024] After pouring a large volume of concrete, it is necessary to monitor the surface temperature of the crucible and the temperature of the center of the structure, so as to take corresponding measures to control the temperature difference between the inside and the outside of the casting block and the temperature drop rate to prevent harmful temperature cracks from occurring in the crucible;

[0025] Strictly control the temperature difference between the inside and outside of the crucible, the surface temperature difference between the crucible and the ambient temperature should not exceed 25 degrees, the cooling rate is not more than 1.5 degrees / day; when the internal and external temperature difference is greater than or equal to 25 ° C, increase the coverage or increase the surface of the crucible Thickness of water storage; Therefore, the temperature should be closely monitored. The new measures should ensure that the temperature difference is controlled within 25 °C. When the internal and external temperature difference is less than 20 °C, the covering material should be gradually removed and heat-dissipated.

Advantageous effects of the invention

Beneficial effect

The invention has convenient construction and good effect. It is beneficial to improve the integrity and impermeability of the structure, and improve the seismic resistance of the structure.

BEST MODE FOR CARRYING OUT THE INVENTION

[0027] A super high-rise residential project 3.3m thick raft foundation construction control method, comprising the following steps:

[0028] (1) Preparation before pouring

[0029] (1) In the first half of the construction of the large-volume concrete, check the reserves of the raw materials of the suppliers, the supply capacity of the cement, admixtures, and miscellaneous materials suppliers, and seal the cement and admixtures. To ensure the supply and quality requirements of large-volume raw materials;

[0030] (2) equipped with two generator sets to prevent power failure of the external network;

[0031] (3) Machinery, vehicle equipment

[0032] Equipped with six sputum pumps, one of which is spared, and the maximum 砼 output per 吋 pump is 50m 3 ;

[0033] (4) transporting the curing cover material to the vicinity of the foundation pit to ensure sufficient maintenance or heat preservation during the condensing and curing process;

[0034] (2) 砼 pouring construction

[0035] (1) Pouring construction process

[0036] Arrangement 砼 car pump → 砼 supply acceptance → smashing machine, pumping mortar, running pipe → pouring 砼 → vibrating → circulating operation → 砼 surface first leveling, squeezing → 砼 surface secondary leveling, Compaction, trowel → third inspection before the final condensation, early shrinkage cracks and then smearing the surface → and 吋 cover insulation moisturizing maintenance → 砼 temperature monitoring;

[0037] (2) Pouring method [0038] The concrete pouring is started from the lower part by the inclined layer stratification method, and rises layer by layer; the inclined surface is formed by pumping natural flowing, the slope is controlled at about 1:8, and the vibrating work starts from the bottom layer of the pouring layer. Move to ensure the quality of construction between layers;

[0039] In the process of vibrating, the vibrating bar is slightly twitched up and down, so that the upper and lower jaws are evenly vibrated, and each time the vibrating is between 20 and 30 s, the bubble is no longer present on the surface of the crucible, and the mortar is released;砼捣捣捣 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , The first line is arranged at the discharge point to make the concrete form a natural flow slope. The second line is arranged at the foot of the slope to ensure the lower part of the slope. The third line is arranged in the middle of the slope. The points on the slope are strictly controlled. , moving distance and insertion depth;

[0040] (3) bleeding treatment

[0041] According to the construction running water during construction, most of the bleeding water is discharged into the sump and the elevator pit, and then drained by the submersible pump, and a small amount of bleeding is treated by sponge suction;

(4) Surface crack prevention construction

[0043] Due to the thick cement slurry on the surface of the large volume pumping, it must be used before the initial setting after the pouring, in order to close the water-collecting crack of the crucible, and the surface treatment of the crucible is first compacted by the tool surface according to the surface elevation, and the long scraper is used. Secondly, it should be rolled and rolled several times before the initial setting by the pressure roller. Finally, before the final setting, check the early shrinkage of the cockroach. The wooden crab is sanded and compacted to close the water. Cracks, during the construction of the squeezing and solidification, the surface of the finishing work must be synchronized and covered with a surface protection layer;

[0044] (5) Maintenance

[0045] Within 12 hours after the pouring, the hoe is covered with water and moisturized, and the maintenance cover is covered with a layer of film and a layer of 50mm polystyrene board. According to the temperature measurement, the closed color cloth is matched.吋Uncovering, the lap joint of the colored cloth is required to be no less than 150mm. The narrow space between the wall columns and the ribs must pay special attention to the insulation measures. After covering with the strip film, cover the insulation quilt to ensure the weak link of the wall column. Insulation work;

[0046] (6) Temperature measurement work of 砼

[0047] After pouring a large volume of concrete, it is necessary to monitor the surface temperature of the crucible and the temperature of the center of the structure, so as to take corresponding measures to control the temperature difference between the inside and the outside of the casting block and the cooling rate to prevent harmful temperature cracks from occurring in the crucible;

[0048] Strictly control the temperature difference between the inside and outside of the crucible, the surface temperature difference between the crucible and the ambient temperature should not exceed 25 degrees, the cooling rate is not more than 1.5 degrees / day; when the internal and external temperature difference is greater than or equal to 25 ° C, increase the coverage or increase the surface of the crucible Water storage Thickness; Therefore, the temperature should be closely monitored. The new measures should be taken to ensure that the temperature difference is controlled within 25 °C _: When the internal and external temperature difference is less than 20 °C, the covering material should be gradually removed and allowed to dissipate heat.

Claims

Claims [Claim 1] A 3.3 m thick raft foundation construction control method for a super high-rise residential project, characterized in that: the following steps are included: (1) Preparation before pouring (1) Half a month before construction of large volume concrete Check the reserves of raw materials of suppliers, the supply capacity of cement, admixtures, and suppliers of miscellaneous materials, and seal the cement and admixtures to ensure the supply and quality requirements of large-volume raw materials; (2) Equipped with two generator sets to prevent power outages on the external network; (3) Machinery and vehicles are equipped with six sputum pumps, one of which is spared, and the maximum output of 砼 pump trucks per hour is 50m3. (4) The curing cover material is transported to the vicinity of the foundation pit to ensure sufficient maintenance or heat preservation during the condensing and curing process; (2) 砼 pouring construction

(1) Pouring construction process

Arranged 砼 car pump → 砼 supply acceptance → smashing machine, pumping mortar, running pipe → pouring 砼 → vibrating

→Cycle operation→The first surface of the 砼 surface is leveled, smeared → 砼 surface is leveled twice, compacted, smeared → the third time before the final setting, the early shrinkage crack is applied and the surface is smeared → and the enamel cover is kept moisturized Maintenance _→砼 temperature monitoring;

(2) Pouring method

The concrete pouring is started from the lower part by the slope layering method and rises layer by layer. The inclined surface is made by pumping and flowing naturally. The slope is controlled at about 1:8, and the vibrating work starts to move upward from the bottom layer of the pouring layer. Ensure the quality of construction between layers of time;

砼In the process of vibrating, the vibrating rod is slightly twitched up and down, so that the upper and lower jaws vibrate evenly, each time between 20 and 30 s, the air bubbles no longer appear on the surface of the crucible, and the mortar is released. Dense, each pump pump outlet is equipped with 5 vibrating rods, 4 sets of work, 1 set of spare, arranged in three ways. The first line is placed at the discharge point, so that the raft forms a natural flow slope, the second cloth Placed at the foot of the slope to ensure that the lower part of the squat is dense, and the third line is arranged in the middle of the slanted surface. The vibration point, moving distance and insertion depth should be strictly controlled at each point on the inclined surface;

(3) bleeding treatment

According to the construction running water during construction, most of the bleeding water is discharged into the sump and the elevator pit, and then pumped out by the submersible pump. The local small amount of bleeding is treated by sponge suction;

(4) Surface crack prevention construction

Because the cement slurry on the surface of the large volume pumping is thicker, it must be used before the initial setting after the pouring, in order to close the water-receiving crack of the concrete. The surface treatment of the concrete is first compacted with the tool surface according to the surface elevation, and the long scraper is flattened; Secondly, it is necessary to carry out several times of rolling and rolling with a pressure roll before the initial setting; finally before the final setting

, and then check the early shrinkage of the cockroach, the wooden crab is sanded and compacted, and the concrete is closed to close the smashing water crack. During the squeezing and solidification construction, the surface of the pulping work must be synchronized and covered with the surface protection layer;

(5) Maintenance

12 Within 12 hours after the pouring, the lid is covered with water and moisturized, and the maintenance cover is covered with a layer of film and a layer of _50mm polystyrene board. According to the temperature measurement, the closed color cloth is matched and uncovered. It is required that the lap joint of the colored cloth should not be less than 150mm. The narrow space between the wall columns and the ribs must pay special attention to the insulation measures. After covering with the strip film, cover the insulation quilt to ensure the insulation work at the weak link of the wall column ribs. ;

(6) 测 temperature measurement work

After pouring a large volume of concrete, it is necessary to monitor the surface temperature of the concrete and the temperature of the structural center in order to take corresponding measures to control the temperature difference between the inside and the outside of the concrete pouring block and the cooling rate to prevent harmful temperature cracks in the concrete;

Strictly control the temperature difference between the inside and outside of the crucible, the surface temperature difference between the crucible and the ambient temperature should not exceed 25 degrees, and the cooling rate should not exceed 1.5 degrees/day; when the internal and external temperature difference is greater than or equal to 25 °C, increase the coverage or increase the water storage on the surface of the crucible. Thickness; Therefore, the temperature should be closely monitored. The new measures should ensure that the temperature difference is controlled within 25 °C. When the internal and external temperature difference is less than 20 °C, the covering material should be gradually removed and heat-dissipated.