Anti-slide pile construction plan
1. Project overview:
The anti-slide piles of the XXXXXXXXXXXXXXX project are 2×3 (meters), 1.5×2.25 (meters), meters), 1.8×2.25 (meters). The pile is a manually dug cast-in-place pile. After the baffles between the piles are prefabricated, the construction method is to use a crane to lift and insert the reserved chute. This project has deep manual digging, complex terrain, and a large amount of work for a single pile. Construction is difficult.
Anti-slide pile is an engineering building that relies on the embedding of the pile by the soil around the pile to stabilize the soil, reduce the pushing force of the sliding body and transmit part of the pushing force of the soil. For non-plastic The landslide is very effective, especially when the two rock layers are sandwiched by a thin layer of plastic sliding layer. The effect is poor for plastic landslides, especially when it is a plastic flow landslide, it should not be used.
2. Basis for preparation:
1. XXXXXXXXXX project construction drawings.
2. "Concrete Quality Control Standard" GB50164-92
"Construction Quality Acceptance Code for Building Foundation Engineering" GB50202-2002
"Concrete Structure Engineering Construction Quality Acceptance Code" GB50204-2002
"Uniform Standard for Quality Acceptance of Construction Projects" GB50300-2001
"Concrete Inspection and Assessment Standard" GBJ107-87
" Technical Specifications for Safety of Temporary Electricity Use at Construction Sites" JGJ46-2005
"Technical Specifications for Inspection of Building Foundation Piles" JGJ106-2003
"Reinforcement Welding and Acceptance Regulations" (JGJ18-96)< /p>
"Construction Quality Acceptance Code for Building Ground Engineering" (GB50209-2002)
3. Construction Deployment
1. Measures to stabilize landslides during construction
1) Clean and smooth the landslide surface, eradicate steep slopes and cliff walls, and fill cracks. If possible, according to design needs, circular water intercepting trenches can be laid separately within the sliding body to reduce surface water seepage.
2) In the construction area of ??anti-sliding piles, the ground should be roughly leveled, and a platform with a width of not less than 2m should be brushed out on one side of the mountain. If there is waste debris or loose sliding bodies on the other side, it should be filled with Tamp firmly to avoid lateral pressure on the pile.
3) For pile hole excavation, comprehensive simultaneous excavation or jump-type interval excavation should be adopted depending on the magnitude of the sliding force, the soil and rock structure of the sliding body, the degree of damage, and groundwater.
4). Depending on the geological conditions, concrete, reinforced concrete, wood and spray protection can be used to protect the wall. If the geological conditions permit and the excavation is not deep and construction safety can be ensured, no support is required. As soon as the excavation reaches the design elevation, the pile foundation has been placed on good bedrock, the well hole is vertical and not less than the design size, and it has reached more than 5m below the sliding surface of the lowest layer, immediately tie the steel bars and pour concrete into the pile body without delay. time.
5) The pile hole should be pierced 10m away, and large piles of materials should not be stored inside. Disposal of debris should also be 30m away, and machinery that generates large vibrations should be located 50m away.
2. Construction management objectives:
1) Construction deployment principles: The project implements objective management, uses advanced technology, careful organization, careful construction, and completes the project with high quality, high speed, and low consumption. Pile foundation works.
2) Quality goal: ensure the quality of this pile foundation project.
3) Construction period target: ensure the completion of all manually dug piles within 80 days.
4) Safety production goals: to prevent major casualties, equipment hazards, and fire accidents, and to nip various safety hazards in the bud.
5) Civilized construction goals: implement standardized on-site management and create a first-class civilized construction site.
6) Service goals: Work closely with all parties to create conditions for civil construction and satisfy the owners.
3 Construction preparation:
Preparation for pile excavation
1) Check the design on site, measure the pile position according to the design, and carry out construction stakeout. When setting out, each side should be slightly larger than the design size according to the specific conditions of the construction site and possible construction errors. Then level the orifice site.
2) The height of the vertical derrick or oscillating pole on the wellhead for discharging, feeding, and lifting should be more than 3m higher than the wellhead, set up a temporary shelter, and make a wellhead drainage ditch. For personal safety during construction, railings are provided at the wellhead (those with thin-shell support above the ground do not need to be provided), foot pedals and wellhead opening and closing doors for lifting personnel to load and unload materials.
3) Prepare a basket for lifting or a special live bottom box, bucket and 0.5t hoist. The hoist must be equipped with a clamping device. When the distance between piles is short, the gap time between excavation and wall concrete pouring should be considered.
4) When there is groundwater in the well, a submersible pump or other type of high-lift water pump should also be equipped.
5). Review the coordinates and leveling points provided by the owner, determine the axis control pile positions and semi-permanent leveling points, prepare a setting-out measurement report and counter-sign with the builder in a timely manner.
6) Determine the location of the equipment and organize the installation of the equipment in order.
4. Construction measurement
1) The instruments planned to be invested in this project mainly include total stations and automatic leveling instruments.
2) Set leveling points around the proposed building as a basis for building settlement observation. The leveling point closure error should be less than ±12√H. Leveling points should be protected during site preparation and earth excavation.
Before excavation, the single axis control point should be determined based on the secondary control points in the site area as the basis for axis control and stakeout. Use a total station to measure each control line and axis, and use a steel tape measure to measure the center position of each pile to facilitate review of the axis, pile center and verticality. Submit a written submission to the supervisor for review.
3) The pile position shall be inspected by the construction personnel, supervisory unit surveyors, and construction unit before excavation, and the wooden piles shall be nailed and marked with iron nails on the piles, and the wooden piles shall be fixed with concrete. After setting out, you can proceed to the next process.
IV. Construction of manually dug pile holes
1. Construction process
Earth excavation (or pumping) → Clean the hole wall and check the verticality and pile diameter→concrete retaining wall→excavation.
2. Artificial hole construction of pile foundation
1), hole construction method
①. Use short-handled picks, shovels and other simple tools to manually dig the soil. When encountering relatively hard rock formations, you can use pneumatic picks or manual chisel construction. Vertical soil transportation, manual vertical soil transportation; after the axis is verified to be correct, the first section of excavation will be started, and concrete retaining walls will be made every 1 meter of footage, that is, 1 meter will be used as a construction section; when the depth of the pile hole exceeds 10 meters, use The blower and air duct send fresh air into the pile hole, and the upper and lower soil buckets ensure smooth communication.
②. Hole excavation is carried out in a team of two people. Each team arranges 2 to 3 piles a day for flow operation to ensure that each pile has one to two molds per day. During construction, a maximum of 5 teams are set up for cross-cutting construction.
③. When encountering boulders or other obstacles during the excavation process, manual construction with air compressors and pneumatic picks is used.
3. Treatment of well wall collapse
During the construction process, when the collapse area is small due to weak, loose soil, the action of groundwater, or the action of blasting, the well must be strictly controlled. and adjacent blasting, immediately support the retaining wall, fill the hollow area with stones, and appropriately reinforce the retaining wall. It is not advisable to remove the formwork support before the poured concrete reaches 80% of the design strength. When the landslide is severe, the soil is too loose, and the groundwater continues to collapse, it is necessary to strengthen observation, remove dangerous rocks and suspended soil, build joists and hidden pillars in the landslide area, and use wooden wedges and long nails to reinforce and nail them, with stones inside. Or fill with waste wood to prevent the earth and rocks from continuing to collapse. Immediate support should be provided, and the steel bars at the collapsed area should be appropriately densed. The formwork support should not be removed before the poured concrete reaches 80% of the design strength.
4. Protective wall support formwork:
The wall must be protected every 1.0 meters of excavation. The protective wall finalizing combination steel mold is installed, and then the template is corrected according to the center point of the pile hole to ensure the thickness of the protective wall and the pile. According to the hole size and verticality, the protective wall steel bars should be installed according to the design, and then the protective wall concrete should be poured. The upper and lower protective walls should overlap by 50mm, and the steel bars should be inserted to ensure the density of the protective wall concrete. The surrounding walls should be poured evenly to ensure the correct position of the center point. . When the concrete reaches a certain strength (usually 24 hours), the formwork is removed. After the formwork is removed, corrections are made and the unqualified parts are corrected until they are qualified. The excavated well shall be provided with a lock according to the design requirements.
5. Clearance acceptance:
When the pile holes are dug to the design elevation, the excavation will be stopped and the builder (or supervision unit) will be notified to work with the design, survey, quality supervision and other units. After the joint appraisal, the pile head is quickly expanded after meeting the requirements, and the bottom of the hole is cleaned and accepted in time. After acceptance, use concrete 100mm slightly higher than the design mark to seal the bottom to prevent rock weathering.
Well completion quality requirements standards:
1), depth and bearing layer meet the requirements;
2), verticality <0.4%, pile plane deviation< 5cm;
3), the sediment thickness at the bottom of the well is zero.
5. Production and installation of steel bars:
The variety and quality of steel bars, and the brands of welding rods and fluxes must comply with the relevant standards of the design requirements. The mechanical properties of cold-drawn and cold-drawn steel bars must comply with the design requirements and construction specifications. The surface of the steel bars should be kept clean. Steel bars with granular or flaky old rust that are still pitted after rust removal are strictly prohibited from being used according to the original specifications.
1. Construction precautions
1) Avoid common quality problems
2) The cutting and cutting dimensions of the steel bars are not accurate. According to the location and location of the structural steel bars, Determine the error after cutting the steel bar and determine whether to adjust or rework it.
3) The formed dimensions of the steel bars are inaccurate, the stirrups are skewed, and the shape error exceeds the allowable value of the quality standard. Grade I steel bars can only be re-straightened and bent once, and other grade steel bars should not be re-straightened and bent. Bending repeatedly.
4) The joints of the stirrups should be staggered and placed vertically; the corners of the stirrups and the intersections of the vertical steel bars should be firmly tied. When tying stirrups, the wire buckles should be tied to each other in a figure-eight shape.
5) When the vertical steel bars of the lower columns are exposed on the floor, it is advisable to use tools or column hoops to retract them into a column bar diameter to facilitate the overlap of the steel bars of the upper columns. When the upper and lower column sections are When there are changes, the exposed part of the lower column steel bars must be accurately closed before tying the beam steel bars.
6) The main bars, stirrups and stiffening stirrups of the steel cage should be stacked according to type, specification and length number to avoid bending and misuse.
7) When the steel cage is placed in the pile hole, there must be a protective layer of pads.
2. Main safety technical measures
1) Machinery must be equipped with protective devices. Note that each machine must have one machine and one gate and a leakage protection switch.
2) Keep roads clear in the workplace and clear signs must be set up at dangerous locations.
3) Operators must hold certificates to work. Familiar with mechanical properties and operating procedures.
3. The binding joints of steel bars should comply with the regulations:
1) The distance between the end of the overlap length and the bend of the steel bar shall not be less than 10 times the diameter of the steel bar. The joint should not be located on the component At the maximum bending moment;
2) In the tension area, the ends of the binding joints of grade I and II steel bars should be hooked, while the ends of grade II and III steel bars do not need to be hooked;
3 ), the ends of compression grade I steel bars with a diameter not larger than 12mm and the ends of stress-bearing steel bars of any diameter in axial compression members do not need to be hooked, but the overlap length should not be less than 35 times the diameter of the steel bar;
4) The thickness of the concrete protective layer of the stressed steel bars should meet the design requirements.
VI. Templates
1. Before installing the templates, on-site measurement and setting out should be carried out according to the design drawings, and control points should be set up as required. If necessary, the main control points should be led out of the construction position to prevent damage. Location, ready for calibration.
2. When installing the formwork, there should be sufficient rigidity to ensure that the concrete pouring process remains stable. During the installation process, the horizontality and verticality are repeatedly tested, and the deviation is corrected in time. The allowable deviation of the template installation must not exceed the value specified in the specification.
3. During the concrete pouring process, a dedicated person should be assigned to perform regular inspections, adjust the shape and position of the formwork, and strengthen inspection and maintenance. If the formwork is deformed, measures should be taken immediately until the pouring is stopped.
4. When dismantling the formwork, the formwork should be dismantled layer by layer from top to bottom, and the anchoring connectors should be removed in batches. In order to prevent large pieces of formwork from falling, damaging and injuring people, if necessary, hook them with ropes and lower them slowly. . The dismantled formwork, brackets and accessories should be cleaned in time, classified and stacked neatly.
7. Pile core concrete pouring
1. Use C30 commercial concrete for pouring.
Before pouring, the pile holes should be cleaned first, the accumulated water should be drained, and the sediment should be cleaned down to ensure that the bottom is clean.
2. When the pouring height is greater than 2 meters, a string barrel should be installed at the discharge port to avoid delamination and segregation of concrete. In order to ensure the compactness of the concrete, vibrating rods are used for layered tamping, and the pouring height of each section is less than 0.5 meters. The operation of the vibrator should be "fast insertion and slow extraction". During the vibration process, the vibrator should be slightly twitched up and down to achieve even vibration up and down. The vibration time for each point is generally 20 to 30 seconds, but it should also be considered that the surface is level and no longer sinks significantly, no bubbles appear, and mortar appears on the surface.
3. For layered pouring and vibration, the vibrating rod should be inserted into the lower layer about 5cm to clear the seams between the two layers. After the concrete pouring is completed, the test blocks should be left as required, and the pile tops should be covered with straw bags for maintenance and should be maintained with regular wet water or water storage.
4. When the amount of water seepage in the hole is large and the depth of water accumulation at the bottom of the hole is greater than 100mm, underwater concrete pouring should be used, using a drilling rig or Luoyang shovel as the lifting machine. The slump of concrete is controlled between 16 and 18cm, and the slump is measured on site to ensure its fluidity and workability.
5. After the concrete is poured, timely maintenance measures should be taken according to different climates to avoid early cracks in the concrete caused by untimely maintenance.
6. Prefabricated component production
1) The prefabricated component production site should be spacious and flat, with access to the work surface.
The prefabricated component template Installation is related to the structural size and appearance, and is an important indicator of project quality. The formwork should be coated with release agent before installation. It is required that the installation position is accurate, the layout is flat, the joints are tight, the installation is firm, and deformation and slurry leakage are strictly prevented.
2) Concrete is supplied from the mixing station next to the prefabrication site and vibrated by vibrators. When vibrating, pay attention to the spacing, depth, and time of vibration to prevent leakage of vibration and avoid the appearance of honeycombs and pitted surfaces. The components must meet the lifting strength requirements before they are allowed to be lifted and stacked.
3) The prefabricated components are transported to the working surface, lifted and installed by a 16T truck crane, and put into place.
Labor schedule:
Type of work
Unit (person)
Handboy
10
Well digger
20
Rebar worker
20
Mechanical and electrical worker
2
p>Concrete work
10
Total
62
8. Technical measures to ensure quality
< p>In order to ensure the quality of the project, the following quality assurance measures have been formulated:1. Study the drawings carefully, do a good job in joint review of the drawings, and fully understand the intention of the design change and the process requirements; do a good job in various construction projects Prepare technical briefings at all levels and strictly follow construction procedures.
2. Strictly abide by the national construction specifications and technical operating procedures as well as the project quality evaluation standards. In the quality evaluation of divisions and sub-projects, the evaluation shall be carried out according to the national project quality evaluation standards.
3. Establish an inspection team composed of the unit's engineering project management department and the operation team leader to conduct regular or irregular inspections.
4. Adhere to the operating team self-inspection and handover acceptance system between various types of work and processes. Full-time quality inspectors follow up and inspect. The company conducts monthly quality inspections, and promptly implements rectification and correction of quality problems detected. Develop specific measures for effective prevention.
5. All raw materials and semi-finished products must have factory certificates or warranty certificates and test reports. If there are copies, they must be stamped by the original unit and indicate where the originals are. After the relevant materials enter the site, the material clerk must promptly fill out the "Raw Material Quality Inspection Notice" and submit it to the laboratory. They can only be used after passing the random inspection by the laboratory.
6. The engineering project manager is responsible for the unit engineering measurement, and does a good job in positioning, measuring and setting out, axis, elevation, vertical monitoring and settlement. The axis control points and level points must be selected in solid and reliable locations. be protected. The positioning and setting-out must be accepted and reviewed by the quality inspector and the technical person in charge before proceeding to the next construction process, and the positioning and setting-out records and positioning and setting-out review records must be processed in a timely manner.
7. Construction management personnel and special types of construction personnel must hold certificates to work, and operations without certificates are strictly prohibited.
8. Quality problems or hidden dangers raised by superior authorities and supervisors must be humbly accepted and conscientiously rectified. When matters are more complicated or when the two parties have disputes, they should discuss with each other, seek truth from facts, and learn from each other's strengths.
9. Properly manage engineering technical data and comply with national engineering quality assessment standards from the start of the project. Collect all kinds of information on a monthly basis and in accordance with regulations, such as material certificates or warranty certificates, test reports, design changes, technical approvals, technical disclosures, acceptance records, technical reviews, etc., and send them to the technical person in charge for unified filing.
10. Various materials must be registered according to variety, specification, batch size, entry date, inspection report, use part and quantity.
9. Construction Progress Guarantee Measures
1. Complete Plan Guarantee System
Establishing a complete plan guarantee system is to grasp the initiative in construction management and control construction production. situation, a key link to ensure the progress of the project. The planning system of this project will take the daily, weekly, monthly and overall control plan as the main line to form the construction period plan, and derive from this the technical support plan, business support plan, material supply plan, quality inspection and control plan, safety protection plan and logistics Cover a range of plans.
2 Protection of people, property and property.
After signing the contract, arrive at the construction site on time according to the personnel, equipment, and material arrival plan in the construction organization design, and make preparations for starting work, and plan the usage of labor, main materials, and components.
3. Guarantee of technical process
1) Prepare targeted construction organization design, construction plan and technical explanation.
This project will be planned according to the plan and a detailed, targeted and operable construction plan will be formulated, so that the management and operation levels will be familiar with and master the construction technology and quality standards.
2) Use small flow construction
The project will use small flow construction method to organize construction according to the project duration requirements and stage target requirements, and according to the overall schedule arrangement. The rhythm-balanced flow construction method is a scientific construction organization method. The idea is to use advanced construction technology and construction technology to compress or adjust the duration of each process in a flow section to achieve a rhythm-balanced flow. In actual construction , our company will adopt measures such as increasing resource investment and strengthening coordination and management to meet the needs of balanced flow rhythm according to the construction content, project volume and season of each stage.
10. Technical measures to ensure safety
1. Technical measures for safety
1) When the excavation depth of the pile hole exceeds 5M, the bottom of the hole should be A safety net made of semicircular densely meshed steel bars is installed on the flange of the protective wall at about 3M above. The protective net increases as the depth of the hole is properly set downward. When the bucket is going up and down, the operator must stand under the protective net, stop digging, and pay attention to safety. When the hole depth exceeds 10M, the ground should be equipped with an air supply device into the hole. , the air volume should not be less than 25L/S. When drilling at the bottom of the hole, the air supply volume should be increased.
2) A ladder must be placed in the pile hole and extended to the working surface as the digging depth increases for safe use.
3) It is strictly prohibited to operate under the influence of alcohol, smoking and using open flames in the hole. When lighting is required, a safety miner's lamp or a safety lamp below 12V should be used.
4) Manhole covers and fences should be installed to surround the pile mouths where concrete has been poured and holes are being dug but not yet completed.
5) After pumping water in the hole, the special power supply for pumping water must be cut off before the operator can work in the pile hole. It is strictly prohibited to operate with power supply. Workers working in the hole should pay close attention to the situation in the hole and are not allowed to leave their posts without permission.
6) The installation and removal of all power cords in the construction site must be handled by a certified electrician. Electrical appliances must be strictly grounded, connected to zero and use leakage protectors. The electricity used in each pile hole must be separated. It is strictly prohibited to use multiple holes in one gate and multiple uses in one gate. The "Technical Specifications for Safety of Temporary Electricity Use at Construction Sites" shall be strictly implemented.
7). Hang eye-catching safety signs and safety publicity boards everywhere on the construction site to warn and remind every construction worker entering the site to pay attention to safety. Reasonable use of different colors in the working environment can reduce the fatigue of the workers' eyes and body as much as possible and reduce the frequency of accidents.
8) When entering the construction site, personnel must wear safety helmets as required and wear seat belts when working at heights. Anyone who is disheveled or wearing slippers will not be allowed to enter the site. Those found violating the regulations will be fined. , Those who refuse to change their ways after repeated admonishment are strictly prohibited from entering the construction site. Safety helmets, safety nets, and seat belts must pass the test before they can be used.
2. Safety management system
1) A safety production organization led by a technical person in charge.
2) Establish a safety production responsibility system for personnel at all levels, sign a safety contract, and implement it conscientiously.
3) A strict education and assessment system is implemented for workers entering the site, and they will be hired after passing the assessment.
4) All personnel working in special jobs must hold certificates and be strictly managed.
5), twice-monthly special safety inspections and daily irregular inspections.
6) Sub-item safety technical disclosure, each construction worker will make a targeted disclosure based on the actual situation of the project, and the technical leader will review and sign and then hand it over to the team leader for signature.
7) Levels must be strictly managed, and teams and groups must be guided to carry out pre-shift safety activities.
3. Electricity consumption
1) The power distribution room is set up in accordance with the standards issued by the ministry, and all electrical boxes use standard electrical boxes.
2) On-site lines are erected in accordance with the requirements of the three-phase five-wire system, and "three-level" protection is implemented, with one machine, one gate and one insurance.
3) Various electrical boxes, leakage protectors and other equipment are all products approved by relevant national departments.
4) Correctly configure the leakage protector and electrical box fuse to avoid overloading.
5) All construction electricity and domestic electricity on site are managed by full-time electricians on site, and no one is allowed to make random connections.