Chapter 1 Preparation Instructions and Preparation Basis
1.1 Preparation Instructions
1.1.1 Our company adheres to the idea of serving the users, and the preparation of the construction organization design focuses on the improvement of the project quality, accelerating the construction progress, and grasping the safety and civilized production to provide favorable protection. For customers to brew a good environment. Establish a good social image.
1.1.2 Our company attaches great importance to the preparation of this construction program design, organized by the company's technical director of the project's key points, difficulties and key special processes to overcome. In a careful study of drawings, clear engineering characteristics, fully understand the construction environment, accurately grasp the owner's requirements under the premise of the establishment of the preparation of the thematic group, brainstorming and broad-based, and strive to highlight the focus of this program, in line with the actual project, advanced thinking, operability and relevance.
1.2 Preparation basis
1.2.1 According to the "People's Republic of China **** and the State Safety Production Law", to strengthen the control of dangerous point sources in construction projects, to avoid the occurrence of serious and major accidents.
1.2.2 According to Article 1 of Interim Measures for Safety Management of Deep Foundation Pit Construction of Construction Projects in Luoyang City, in order to strengthen the safety management of deep foundation pit construction of construction projects, to ensure the safety of deep foundation pits and adjacent buildings (structures), underground facilities and roads, and to prevent the occurrence of safety accidents, in accordance with the provisions of relevant laws and regulations. According to the geological situation and the surrounding environment depends on the construction program.
1.2.3 According to the "Code for Quality Acceptance of Construction of Building Foundation Works" GB 50202-2002
Chapter 2: Project Overview and Project Characteristics
2.1 Location of the Site and Topography and Geomorphology
2.1.1 The site of the project is located in the yard of the Luoshu Anjun Subdivision, and the site is relatively open and flat. The site is relatively open and flat, with "three passes and one leveling" completed and convenient road transportation, which meets the construction conditions.
2.1.2 The entire construction site without vehicles and pedestrians interference, the project around the implementation of closed construction, open four import and export gates.
2.1.3 The terrain of the project is flat, and all the obstacles are cleaned up, which is basically conducive to the construction.
2.1.4 This project foundation excavation has a basement.
1. The excavation depth of this project is about 4m. The construction is difficult, and effective measures must be taken to ensure construction quality and safety.
2. As the foundation of this project is to use three seven gray soil mat foundation, must take effective measures to ensure construction quality and safety.
2.1.5 According to "Interim Measures for Safety Management of Construction of Deep Foundation Pit in Luoyang City Construction Project" deep foundation pit excavation area outside the boundary line of the excavation depth of two times the range: buildings (structures) and municipal infrastructure and highways, etc., must be made to strengthen the treatment.
Chapter III Construction Preparation
3.1 Machinery and Equipment
1, machinery: 1 excavator; 1 50-type loader; a roller; 4 dump trucks;
2, machinery: wheelbarrows, shovels (pointed, flat-head), steel tape measure, ladders, gradient scales, small lines and other special construction equipment.
3, safety maintenance: 1.5m guardrail wooden main pole, safety warning rope, safety warning signage, warning lights, colorful striped cloth, bracing plate, bracing wood, square wood.
3.2 Operating conditions
1. Before earth excavation, according to the requirements of the design drawings and construction program, the underground and aboveground obstacles in the construction area are removed.
2. All kinds of existing pipelines have been relocated or reinforced, and underground pipelines and dangerous areas not dealt with for the time being are clearly marked.
3. When there is groundwater in the pit, according to the local engineering geological data to take measures to reduce the groundwater level, the water level down to the bottom of the pit below 0.5m.
4. Water supply, power supply, temporary facilities in the construction area to meet the requirements of earth excavation, road leveling and smooth.
5. Do a good job of earthmoving machinery, transportation vehicles and a variety of auxiliary equipment maintenance checks and field work.
3.3 Technical Preparation
1. Before excavation, carefully review the design drawings and instructions, have done a good job of drawing review and construction design, determine the excavation section and soil location, transportation and construction roads.
2. Do a good job of written construction safety, technical briefing to the personnel concerned, and have signed.
3. Have measured and placed the pit excavation edge line, and marked with white gray. Determine the earth dumping site and transport soil construction route.
Chapter 4 Construction Technical Measures
4.1 Process Flow
Measuring and placing → Basement Excavation → Wall Protection Construction → Trench Inspection → Vegetative Concrete Bedding → Sanqi Gray Soil Bedding → Vegetative Concrete Bedding → Reinforced Concrete Strip Base → Basement Foundation Picking Up the Flat
4.2 Construction Sequence
1. Determine the excavation of base pit depth.
2, according to the engineering profile, site investigation and exploration and engineering characteristics analysis.
3, according to the ground survey information, using a pit slope excavation. According to the "building foundation design code" in the category of soil and the top of the slope with or without static and dynamic loads.
4.3 construction technology
1, pit excavation using layered excavation, manual slope repair and check the bottom of the construction, side slopes within 3m for 1:0.3, side slopes above 3m 5m below for 1:0.5, excavation line from underground facilities and roads near the side slopes of 1:0.2.
2, pit bottom design elevation above 0.2m -0.3m of the original soil should be retained, prohibit disturbance, the use of artificial cleaning, such as local over-excavation, need to be backfilled with even gravel tamping.
3, taking into account the location of the basement of this project, pit excavation is mainly mechanical, close to the underground facilities with manual excavation, manual trimming and picking up the bottom of the method of operation.
4, excavation trenching, should strictly control the base elevation, prohibit over-excavation. Base design elevation of 0.3m above the original soil should be cleaned up to the design elevation, if the local over-excavation or disturbance occurs, must be replaced with fill level 10-15mm natural grading of sand and gravel material or medium coarse sand and tamping.
5, the substrate, such as blocks, gravel, bricks and other hard objects, should be shoveled to the design elevation of the following 0.2m, and then paved with natural grading sand and gravel material, the surface layer supplemented by sand and soil leveling and tamping.
6, pit excavation, excavation process should not be exposed for a long time, it is appropriate to excavate a section, construction section, prohibit drying slot construction.
4.4 Precautions
1. Base over-excavation: excavation pit shall not exceed the base elevation, such as individual places over-excavation, its treatment method should obtain the consent of the design unit.
2. Unprotected base: the excavation of the foundation pit should minimize the disturbance of the base soil. If the foundation can't be constructed in time, 30cm of soil layer can be reserved above the base elevation without digging, to be done when the foundation is dug again.
3. Construction order is unreasonable: should be strictly in accordance with the construction program for the construction sequence of earth excavation, should pay attention to the appropriate first from the low excavation, layer by layer, section by section, the formation of a certain slope.
4. excavation size is not enough, the slope is too steep: the excavation width and slope of the bottom of the pit, in addition to the structural size requirements should be considered, should be based on the construction needs to increase the width of the working surface.
5. Before the excavation of the pit, the first use of slag or even gravel paving construction road or construction road hardening treatment.
6. earth excavation using excavator excavation, first uncover the surface layer according to the design depth of the pit to a certain rate of slope line excavation, excavation leave 30cm for artificial bottom picking up the flat, so as not to disturb the original soil of the base trench.
4.5 Rainy day construction measures
1, in order to ensure the quality of the project and prevent the occurrence of safety accidents, in the process of construction, should be part of the project or process to be rationalized. Strengthen the drainage work and prevent the occurrence of pit collapse accident during the construction in rainy season.
2. Detailed investigation and mastery of rainy season information, do a good job in the construction of temporary protective measures.
3, on the main materials and machinery prepared during the rainy season construction reserve.
4, rainy season construction education for workers.
5, the design and construction of temporary works give full consideration to rainproof requirements, construction right-of-way drainage system. Arrangements for special maintenance, regular inspections before and after the rainfall drainage, and set up obvious access signs.
6, in addition to timely grasp of the daily weather conditions, but also with the local meteorological department signed a forecast agreement, the local meteorological department regularly provide ten days, monthly weather forecasts, and accordingly reasonable construction arrangements.
7, rainy construction in the excavated pit, should pay attention to slope stability. If necessary, it can be appropriate to slow down the slope gradient or set up support. At the same time should be surrounded by earth embankment on the outside of the pit or digging a ditch to prevent the inflow of surface water. Frequent inspection of slopes, support, earth embankment, found that the problem is dealt with in a timely manner.
4.6 Quality standard
(1) Guarantee project The quality of subsoil soil of column foundation, pit, and site must be in accordance with the design requirements, and is strictly forbidden to be disturbed.
(2) General items The excavation of column foundation, foundation pit and foundation soil of the site must meet the specification requirements.
4.7 Finished product protection
(1) For positioning standard piles, axial lead piles, standard leveling points, gantry boards, etc., no collision shall be allowed when digging and transporting soil, and no resting on the gantry boards shall be allowed. And should often measure and check its plane position, horizontal elevation and slope gradient whether it meets the design requirements. Positioning standard piles and standard leveling points should be regularly retested and checked for correctness.
(2) Earth excavation shall prevent subsidence and deformation of neighboring existing buildings or structures, roads and pipelines. If necessary, protective measures shall be taken in consultation with the design unit or construction unit, and settlement or displacement observation shall be carried out during construction.
(3) If any cultural relics or ancient tombs are found during the construction, they should be properly protected and should be reported to the local authorities in time before the construction can be continued. If found with the measurement of permanent stakes or geological, seismic department set up long-term observation points, etc., should be protected.
Chapter V Safety Assurance System
5.1 Excavation Measures
1. When excavating the pit with groundwater level, measures should be taken to reduce the groundwater level according to the local engineering geological data. Generally, it should be reduced to 0.5m below the excavation surface before excavation.
2. Construction machinery to enter the site of the road, should be checked in advance, if necessary, to strengthen or widen the preparatory work.
3. Selection of earthmoving machinery should be based on the topography and operating conditions of the construction area, soil type and thickness, total volume of work and duration of the comprehensive consideration to be able to play the efficiency of construction machinery to determine.
4. Construction area running route layout, should be based on the size of the work area mechanical performance, transportation distance and terrain undulation and other conditions to be determined.
5. In the mechanical construction can not work in the parts and repair slope gradient and cleanup should be equipped with manual.
6. excavator pit excavation of large pits, should be vertically divided into rows and layers in accordance with the slope line down shovel digging, but the center of each layer of the lot should be a little higher than the two sides, in order to prevent the accumulation of water.
7. The use of excavator backhoe, pull shovel its construction method has two kinds:
1) end digging method: excavator from the end of the pit, in order to backward traveling method for excavation. Dump trucks are configured to load and transport soil on both sides of the excavator.
2) Lateral Excavation Method: The excavator moves along one side of the pit on one side and the dump truck loads and transports the soil on the other side.
8. The use of shovel construction method positive shovel excavation.
9. excavator moving along the edge of the excavation, mechanical distance from the upper edge of the slope of the width shall not be less than 1/2 of the depth of the pit. such as excavation depth of more than 5m, should be determined according to the professional construction program.
10. In the excavation process, should always check the status of the trench wall and slope. Depth greater than 1.5m pit, according to the soil condition, should be prepared to support, in order to prevent collapse.
11. excavation pit, shall not be dug to the design elevation below, such as can not accurately dug to the design foundation elevation, can be in the design elevation above a layer of temporary soil is not dug, so that after leveling, by hand dug out.
12.temporary soil layer: general shovel, excavator digging, for about 20cm; excavator with backhoe, shovel and pull shovel digging for about 30cm is appropriate.
13. In the mechanical construction of the earth can not be dug, should be with manual digging at any time, and wheelbarrows to transport the earth to the place of mechanical digging, in order to dig out in a timely manner.
14. Repair help and clear the bottom. From the bottom of the slot design elevation 50cm slot gang, find the horizontal line, nailed on a small wooden peg, and then manually dig away the temporary soil layer. At the same time by both ends of the axis (center line) lead pile pull through line (with a small line or lead wire), check the size from the edge of the slot to determine the slot width standard. To repair the edge of the slot, and finally remove the bottom of the slot earth. After repairing and leveling the bottom of the slot for quality inspection and acceptance.
15. Excavation of the pit of the earth, in the site has the condition of stacking, be sure to leave enough backfill need to use the good soil; excess earth, should be transported away, to avoid the second carry.
5.2 Safety Protection Measures
a. After excavation of the pit, the whole line will be manually trimmed, and the trimming requirement will be the protruding soil wheels left behind after mechanical excavation to be chipped in the direction of slope, in order to prevent the wind from drying, cracking and dislodging.
b. The upper mouth of the pit earth and particles for manual clearing and picking up the main distance from the trench edge within 1.5m.
c. Set up guardrail along the periphery of the pit in the range of 2m from the mouth of the pit edge, with a height of 1.5m.
d. Hang safety warning signs and safety warning ropes along the guardrail in each obvious position.
e. Pit side set up special people for safety patrol, patrol personnel, must ensure that 24 hours on duty.
f. Set up red signal warning light along the guardrail of the ditch at night.
g. Rainy days and sunny days at the bottom of the pit construction, with colorful strips of cloth to cover the two sides of the pit wall, to avoid the constant infiltration of rainwater caused by the pit collapse and sun exposure caused by the pit wall loosening and sliding.
5.3 Safety measures
(1) The up and down trench must take the horse path, safety ladder. The distance between the horse path and safety ladder should not be more than 50mm.(2) Before removing the support, the buildings, structures and pit walls on both sides of the pit should be inspected for safety, and the implementation rules and safety measures for removing the support should be formulated.
(3) machinery excavation of earth, should be in accordance with the requirements of the safety technology delivery slope, pile of soil, is strictly prohibited digging, tracks or tires should be from the edge of the pit to maintain a distance of more than 1.5m.
(4) the excavator should be checked before operation, to confirm that there are no obstacles and other people within the range of movement of the arm and bucket, sound the horn to signal the police before operation.
(5) the pit periphery set up no less than 1.5m guardrail, set up warning lights, and sent a person to patrol.
(6) The height of pile of soil should not be more than 1.5m, and should not be less than 1m from the edge of hole, and the pile of soil should not cover other facilities.
(7) When picking up the bottom of the artificial pit, the horizontal distance between two persons should not be less than 2m, and the vertical distance should not be less than 3m.
(8) Safety briefing should be given to the crane driver and the commanding personnel below before hoisting.
(9) crane in hoisting the installation of tower crane, the crane should be parked at a safe distance from the location, not from the pit side of a very close position, to listen to the full-time safety officer command arrangements.
(10) crane installation of tower crane, to be sent to check the parking around the pit mean there is no loose, cracks.
(11) due to the artificial excavation hole pile foundation is relatively deep, above to send a person to command, but also pay attention to the safety of the base operator.
5.4 Monitoring measures
1. Project manager led by a full-time safety officer to form a safety team, the team members from the operators of each construction bid, each construction bid to draw a person.
2. Members of the team should be trained to learn a variety of safety norms.
3. Members of the team to play a leading role in the construction site safety
4. Members of the team in their respective sections of the construction, to check the construction of a variety of factors that cause insecurity, to do "prevention-oriented, safe construction".
5. In the excavation of deep foundation pits, to check the neighboring buildings (structures), roads and the surrounding environment of the settlement and displacement of the situation for observation.
6. In the deep foundation pit operation, to check both sides of the foundation pit trench wall of the soil for loosening, cracks, but also check the environment around the trench for ground water into the pit, and cause collapse.
7. When manually trimming the edges, it is necessary to detect the presence of underground facilities (cables, pipelines, etc.)
5.5 Rescue plan
1) Each manager should be trained in safety knowledge to be able to cope with emergencies on the construction site.
2) The general manager of the company and the on-site management personnel should be at the first scene of the safety accidents and be able to deal with the safety accidents occurred in a timely manner.
2) construction site by arranging a car to emergency site emergencies.
3) In the event of a major security incident, to contact the local public security departments, hospitals, resident troops, the government to send people to participate in the rescue.
5) The occurrence of safety accidents must be reported and cannot be concealed.
5.6 Ambulance measures
1. 120 ambulance should be notified at the first time.
2, the more serious injuries should be sent to the hospital in time.
3, the construction site to prepare some rescue medical drugs.
5.7 Environmental protection measures
With the increasing improvement of people's living standard, the status of environmental protection work is more and more important. In order to respond to the call of the state and Chengdu city to do a good job of environmental protection, to meet the relevant requirements of the owner, according to the characteristics of this project, and strive to do a good job of environmental protection.
(a) Use the time after the weekly safety study to increase the publicity of environmental protection regulations and knowledge, and improve the environmental protection awareness of all employees.
(ii) targeted solutions to various sources of pollution:
1, to prevent noise pollution
1) Reasonable arrangements for construction work time, not to use the vibration of the hammer and other noisy construction machinery at night. Sound construction is strictly prohibited after ten o'clock at night.
2) The construction machinery should be frequently checked and maintenance, to ensure that the equipment is always in good condition, to avoid the noise worrying the people and spills pollution of the surrounding environment.
2, to prevent mud, sludge pollution
1) Excavation pit of the abandoned soil must be removed within 24 hours, to avoid on-site piling up, the residual mud removal using bulk material transportation trucks.
2) Strictly in accordance with the provisions of Chengdu city about the discharge of sludge for a variety of formalities, to the designated location of the discharge.
3) The earth piled up at the site should be covered; the vehicles for earth transportation should be closed, and should be washed when entering the social roads.
4) The earth transportation road should be sprinkled frequently to prevent dust.
3, to prevent construction, living sewage pollution
1) to prevent the site sewage outflow, pollution of the surrounding environment. Living area of the sewage to do a good job of precipitation and slagging work, so as not to silt the drainage network.
2) rainy day in and out of the vehicle wheels must be rinsed to prevent the wheels with mud, pollution of the surrounding environment.
(C) to prevent dust, exhaust pollution
1, in the wide avenue gate entrance and exit paved sacks 50m, to prevent the wheels bring out soil particles into the social roads.
2, the establishment of a full-time sweeping team, the channel, the barrier to carry out regular sweeping, and the channel to sprinkle water to prevent dust.
3, motorized construction machinery to do a good job of overhauling the work, especially the exhaust gas emission testing, to minimize exhaust gas pollution.