For urban urban areas, huge shock waves will cause a lot of safety hazards to the surrounding high crowded buildings, and the flying stone is dangerous to pedestrians in the street. Dust brings great inconvenience to the lives of urban residents. Although the urban control blasting technology has been widely used as the continuous development and application of modern science, the impact of the vibration, impact, and flying stone, etc., which control the blasting, and the impact of the surrounding are not completely eliminated, and with adjacent buildings. The spacing is almost zero, and the blasting construction cannot meet the control requirements, so under the current conditions, there is a need to find another way to control, that is, the selection of static blasting construction technology.
Static blasting technology is a new type of blasting construction technology developed this year. It is a development and extension of routine explosive blasting. Static blasting rock demolition supplier agents are non-combustible, non-explosive, non-toxic items, is an inorganic salt powder-shaped crushing agent containing aluminum, magnesium, calcium, iron, oxygen, silicon, phosphorus, titanium and other elements. After stirring, in the borehole, after hydration, a huge expansion pressure is generated, and the wall is applied, and the concrete or rock is quietly broken.
2.1 Security: Static blasting is controllable, will not be dismantled like explosives blasting and other impact, it produces some dangerous hidden dangers, no need Take complex safety measures.
2.2 Environmental Protection: Will not generate vibration, impact, noise, dust, frit, rock, etc. The surrounding environment will not be affected, even in the dense region or room, and the precision equipment, there is no interference. 2.3 Economy: Static blasting can complete the split process, and can continue to work continuously, repeat the efficiency of work, low operating cost, no need to blast the operation, Isolation or other time consuming and expensive safety measure.
2.4 Simple construction: Simply burying or drilling into the blasting agent, the construction is convenient and simple.
Applicable range 3.1 Suitable for dismantling and dismantling of concrete, reinforced concrete structures, foundation, downtown building, and mining of valuable stone.
Static blasting is to cut the concrete with static crusher. Static crushing is a powdery engineering construction material that does not use explosives to make rocks, concrete cracking, its main ingredients are raw lime (ie, calcium oxide), and contain some compound catalysts that are incorporated in a proportion. Popular new, environmentally friendly, non-explosive construction materials.
Static blasting is a hydration reaction using a static crusher in the medium drilling, so that the broken crusher crystalDeformation, producing volume expansion, thereby slowly, quietly pulling the expansion pressure (up to 30 MPa-50 MPa, the maximum experimental value of up to 120 MPa, the concrete tensile strength is generally applied to the hole wall, after a period of time ( 12-24h) reach the maximum value and breaks the media.
Figure 1 Static blasting agent 05 Process flow and operational point 5.2 Operational Point 5.2.1 Construction Preparation (1) Support the corresponding middle floor and change Support must reach the design requirements, and can be constructed by the design. (2) Support pre-demolition safety, the technical cost must be in place, beware of sudden accidents.
(3) Supporting the machinery used, the tool must meet the specifications, and the construction personnel must be certified.
(4) Close the construction site, remove the pipelines and other components attached to the support, and do a good job in protective facilities, set up ambients around the site, and set a safety warning sign.
(5) Demolition the demolition area and the route according to the instructions of the construction drawing.
(6) Determine the local temperature, the chemical temperature, mixed water temperature, concrete temperature, whether the temperature of the container is in line with the requirements; (7) Check if the drug packaging is damaged. (8) Before operating, please determine the following material items: 1, the agent. 2, clean mixing and water. 3, water bucket, mix the basin and the water scoop. 4, a throw (horizontally filling). 5, protective glasses. 6, rubber gloves. 7, backup clean water and towel 5.2.2, construction method 188.8.131.52 Bored design: in order to reduce the amount of drilling, partially expanded holes when supporting pouring Embankment work. Other expansive holes are carried out in a live drilling method. The cloth is designed as follows: Reserved hole arrangement table 1 Figure 2 Artificial cloth hard paper hole [ 123]
Figure 3 Circular Control Arrangement
184.108.40.206 Blasting Pre-Clear Hole: Due to the hole to blasting construction, there is more garbage and dust in the expansive hole in front of the burst construction Need to clean, so as not to affect the blasting effect, my project department uses first to clean the embedded hole hard paper, and finally use the air pump to clean clean.
Fig. 4 Pre-bucking paper cleaning Figure 5 Blowing emptying 220.127.116.11 Pilute expansion agent ingredients: Push water first, according to the static exploded expansion agent according to a certain water and drug proportion, thoroughly stirred into a paste. Fig. 6 expansion agent formulated 18.104.22.168 Pacific medicine: uniformly slowly in packed the agitation, and irrigation Full to the dense, do not cover, no stuffed port. Fig. 7 is inserted into the expansion agent 22.214.171.124 detonation process: After 12-24 hours in which the static exploded expansion agent is inserted, the concrete component produces a crack. In the previous day of the support beam, the expansion agent was inserted into the hole, and the cracked width can be broken and broken and cleaned up in the second day. Fig. 8 is supported by expansion Fig. 9 concrete produces deep crack 126.96.36.199 Pin header loose crushing construction: After the expansion, the beam has been crackled, and the concrete is fully detached with the head machine.
Figure 10 Pin header crush
5.3 Construction precautions
5.3.1 Deflation hole deep, aperture, and aperture: hole depth, The aperture and the hole distance are directly related to the crushing effect. The holes are too deep, too large, and the hole distance is too small, which increases the amount of drilling effort and the dose. .
(1) Confirmation of the hole: After the project department and the blasting agent manufacturer have repeatedly studied the height of 90% of the height of the hole.
Fig. 11 is 90% of the aperture of the beam (123]
(2) of the aperture of the aperture: I have the project department to take 1 cube reinforced concrete test, drilling deep 0.9 m, the unit was 20 kg of a size of 36, 38, 40 mm, respectively, drilled, and the graph is made as follows:
Figure 12 of the pore size on expansion pressure
[123 ] (3) The determination of the hole distance: According to the consultation result provided by Fudan Blasting Professional, the actual situation of combined engineering (mainly based on the size of the beam and the concrete strength) is determined to be 200 mm. 5.3.2 Determination of monoporous drug delivery: The amount of expansion agent is directly related to the core parameters of the blasting effect. The greater the amount of drug dosage, but the breakthrough agent is difficult to control, and The hole is more dangerous. According to the design and application of static blasting , the design experience value of the medium hole network parameters and single consumption design can be found in Table 2 Hole mesh parameters and single consumption experience dataTable 2 6.1 Materials and Machines Material equipment must be carefully planned to plan before using the material. The material is proposed as follows:
6.2 Material Investment Plan
6.3 Labor Input Plan
7.1 Construction Quality Assurance Measures
7.1.1 Carefully implement the inspection and quality inspection system
7.1.2 The Self-test , mutual inspection , handover system, the inspection, and the results should be listed, and the quality responsibility will be taken care of the quality responsibility. 7.1.3 Before conducting large area construction, the sample construction must be carried out, and large-scale construction can be performed after the test is passed. 7.1.4 During the construction handover process, the intermediate inspection transfer record is required. 7.2 Whenestal response time control: The slow slowness of the drug response has a direct relationship with the temperature, the higher the temperature, the faster the reaction time. In viceust, there are two methods for controlling the drug response time in the actual operation: one is to add inhibitors in a pharmaceutical mix (soak) water, and another method is to strictly control and (soak) water, agents and The temperature of concrete; the solution to accelerating the action of the agent is generally doped to increase the promoter and increase the mixing and water temperature, and the mixing water is generally controlled in the range of 15-20 ° C, preventing the drug reaction excessive happens to the incident. However, in order to shorten the construction time, speed up the progress, it is necessary to shorten the time to reduce the maximum effect of the drug in the safe case, so the drug reaction time is generally controlled around 30-60 minutes, and the time control of the crack reaches 2 cm is around 5 hours. . 7.3 Just diamonds the hole and the rigid hole, the temperature of the hole wall is high, and it should be determined that the temperature is normal and the requirements are required and clean after cleaning.
7.4 After the concrete is just cracking, water can be added to the crack, support the drug’s continuous reaction, and better results can be obtained.
7.5 Adding a free side to obtain a higher crushing effect.
08 Safety measures 8.1 Non-personnel must not enter the construction site.
8.2 Use our factory products must wear protective glasses (dust-proof anti-impact PVC goggles). Construction personnel did not wear protective glasses operations belong to safety violations.
8.3 The punching is normal. NotPhenomenon that is foreseeable and unable to control. There are many reasons for punching, and there are several of the following: 1 Operators are not operated, the operation time is too long, including the drug has been sent to the air, still filling, the filling does not have an air compartment; 2 temperature control . When the temperature is high, mixed water, the drug, the drilling hole wall temperature is not properly controlled, and the inhibitor is not enough, causing the agent to react out too fast; 3 cloth hole is not designed; the pores and the resistance line are too large. 4 is not properly selected by the drill bit. The drilling diameter is too large; the 5 hole walls are smooth. When the punching, the temperature is high and corrosive, and it may cause serious damage to the cornea within the eye. In order to prevent injury accidents, the operator must worry about the anti-impact dust PVC goggles that meet the national security standards.
8.4 Do not face the metal drilled borehole before the drug is inserted into the concrete. After the drug filling is completed, there is a sack or a mad pad, away from the irrigation. Be more careful when observing the development of fissures. In addition, the construction site should be specially prepared for water and towels. If the drug is splashing into the eyes and the skin, it should be rinsed immediately with water. The situation is severely sent to hospital cleaning treatment.
8.5 In the construction of crushing engineering, it is necessary to change and control the reaction time, and in accordance with the provisions, inhibitors and processes must be added, and other chemical items are not prepared as required.
8.6 It is strictly forbidden to add this product to the small hole container (such as straight mouth glass, beer bottle, etc.), otherwise it is very dangerous.
8.7 Just diamonds the hole and the rigid hole, the hole wall temperature should be determined to determine the temperature to meet the requirements and clean after cleaning.
8.8 Please use it immediately after the expansion agent is opened. If you are not used once, you should immediately tighten your bag, and you will be opened when you use it.
Before the construction site starts, organize management personnel to concentrate on Dust and Polishing Prevention and Treatment Management , and must implement it in construction.
9.2 Personnel Arrangement: Division of management staff is full of duty responsible for dust management, organizing a serious and responsible cleaning team, directly supervising, supervising, managing, supervising, supervising, supervising, supervising, and managing; Implement cleaning work to individuals and clarify their duties.
9.3 Timely understanding of weather forecasting, when the weather forecast wind speed reaches 5 or more, the removal work is suspended. The header is removed by the homework.
9.4 In the construction site, the vehicle cleaning facility and the supporting drainage, mud sedimentation facilities; when the stamp is cleaned, the mud, such as transporting vehicles, such as slag, must be cleaned, and sent. Special person is responsible for acceptance, avoiding secondary dust to the road. 9.5 Building garbage can not be cleared in 48 hours, timely, hovering andDust measures such as sprinkle water. 10.1 Economic Benefits 10.1 Taking Shanghai Dongyuan Fang Residential Project as an Example: Certificate of Finance, Whole Concrete Static Blasting The comprehensive unit price is 305 yuan / ton, which is lower than the traditional mechanical mechanical mechanical mechanical mechanical, and effectively improves the safety risks of the foundation pit support and removal construction and greatly reduces the safety risks brought about by support.
10.2 Social and Green Construction
Concrete static blasting construction technology construction method is simple, no flying stone, relatively high safety, short construction period, low cost, concrete static blasting construction technology A significant social and economic benefit is energy-saving and environmentally friendly, effectively overcomes the shortage of dust and high in the construction base stage, in line with the requirements of contemporary green construction.
11.1 Shanghai Dongyuanfang residential project project is located in Puju Road, Huangpu District, Shanghai, is located in the downtown area, and the surrounding environment is complicated. It is Shanghai. City Huangpu District Key Diversion Commercial Housing Engineering, 2 #, 3 # Building 32 Shear Wall Structure. The underground enclosure structure has a horizontal reinforced concrete support. The support system uses a different cross-sectional reinforced concrete support beam, which is supported to form an overall structure of the support beam and the top beam. Support the set pallet, and the horizontal support is provided with vertical steel. Column.
The support beam has two cross-sectional forms, with 800m × 800mm, 600m × 600mm, and the pallet support beam has two cross-sectional forms, which are 800m × 1000 mm, 600m × 1000 mm. The thickness of the stack bridge is 250mm, concrete. The intensity level is C30; the construction time is April 2015.
11.2 Shenyang Xintiandi A project, constructed by Jiangsu Nantong Erjian Group Co., Ltd. Composition, underground enclosure structure, two horizontal reinforced concrete support, support system adopts different cross-sectional reinforced concrete support beams, supporting the integral structure of the support beam and the top beam, concrete support and removal of concrete static blasting removal construction process. The construction time is September 2014.