Question 2: pit monitoring requires those measuring instruments full-station instrument set on the solution
Question 3: pit horizontal displacement monitoring specifically how to do, with what instrument, detailed 30 points According to the pit support program in the monitoring requirements, in the pit around the typical characteristics of the point of deformation monitoring points buried, and select a good observation base point. The observation base point must be firm and reliable, and the visibility condition with the monitoring point should be good without obstruction. Prepare a good monitoring record sheet, the record sheet in addition to the observation time, coordinates of the monitoring point, displacement value, cumulative displacement value, etc., in a conspicuous position marked alarm value. It is best to use a total station, and at the same time require fixed personnel and instruments, do not change people in the middle of the instrument, so as to eliminate accidental errors. The first observation frequency is high, and later balanced observation.
Problem 4: equipment and technology of pit monitoring Pit monitoring instruments, equipment and technical measures 5.1 Instruments and equipment The input instruments and equipment of this project are shown in Table 5-1: Table 5-1 List of instruments and equipment used No. Name of instrument Quantity Accuracy 1 Suzhou Yiguang DS05 Leveling Instrument 1 ≤ 0.5mm 2 Nanfang NTS-350 Total Station 1 ≤ 0.5mm 350 Total Station 1 5mm+3ppm, ±2 3 Reading Meter 1 2 Indium Steel Level Scale 2 ±0.02mm 3 Inclinometer 1 ±0.1mm 4 Water Level Gauge 1 ±1mm 5 Caliper 1 ±1mm 6 Office Computer 1 7 Printer 1 5.2 Monitoring Accuracy In the monitoring work, the monitoring accuracy should meet the following requirements: 1. Elevation adopts leveling, closed route or round-trip observation: according to the required level each station observation: 1. Observation: according to the requirements of the level of each station to observe the elevation error of +0.5mm, the level of each station every month for testing, testing results in the error are less than +0.2mm. level of attachment to the route, the difference in the attachment of ± 1.0 √ Nmm (N is the number of stations); 2, pit enclosure piles inclination error ≤ 0.5mm; 3, the plane of displacement monitoring error ≤ 1mm; 4, according to the requirements of the level meter According to the requirement, the "i" angle of level meter is no more than 6 seconds; therefore, we test the "i" angle of level meter every month, and control the "i" angle within 6 seconds.5.3 Quality Assurance Measures1、Conscientiously implement the ISO9001 quality assurance system document of our company. ISO9001 quality assurance system documents. 2, detailed technical and quality briefing for personnel involved in the project, clear responsibilities of each monitor. 3, often contact with the owner, supervisor, construction, provide monitoring information, timely feedback to all parties. 4, put into use on a regular basis to ensure that the instrumentation used in the collection of data is true and reliable. 5, proactive protection of the monitoring site.
Question 5: pit project monitoring projects include what building pit project monitoring program includes:
1, project overview.
2, construction site geotechnical engineering conditions and environmental conditions around the pit.
3, monitoring purpose and basis.
4. Monitoring content and items.
5. Layout and protection of reference point and monitoring point.
6, monitoring methods and accuracy.
7, monitoring period and monitoring frequency.
8, monitoring alarm and monitoring measures under abnormal conditions.
9, monitoring data processing and information feedback.
10, monitoring staffing.
11, monitoring instruments and equipment and calibration requirements.
12, operational safety and other management systems.
Question 6: How to monitor the pit tower crane monitoring and measurement monitoring? What methods need to use what instrument? Generally is to hit the concrete before checking the size of reinforcing steel and foundation, as well as to hit the concrete, do test blocks sent to the quality inspection station to do concrete strength testing
Question 7: To determine the pit sidewalls at different depths of the horizontal displacement, which instrument to use Generally use the inclinometer.
Inclinometer is used to monitor landslides, dams, deep pits and tunnels and other engineering buildings underground deformation condition of the equipment.
The inclinometer is installed in a vertical borehole that passes through a potentially mobile formation to a stable one.
The inclinometer actually measures the displacement of the pipe. The first measurement gives an initial value of the position of the pipe. When displacement occurs, the measured value will have a difference with the initial value, and by this difference we can determine whether displacement occurs or not.
Question 8: In pit monitoring, to determine the horizontal displacement at different depths of the pit sidewalls, which instrument is used Pre-embedded inclinometer tube, measured by inclinometer during pit excavation.
Question 9: Monitoring requirements of the pit Monitoring items 4.1 General provisions 4.1.1 The site monitoring of the pit project should be a combination of instrumental monitoring and inspection.4.1.2 The objects of the site monitoring of the pit project include: 1 support structure; 2 related natural environment; 3 construction conditions; 4 groundwater conditions; 5 the bottom of the pit and the surrounding soil; 6 the surrounding buildings. 7 surrounding underground pipelines and underground facilities; 7 surrounding underground pipelines and underground facilities; 8 surrounding important roads; 9 other objects to be monitored. 4.1.3 The monitoring project of the foundation pit project should seize the key parts, so as to achieve key observation, project support, and form an effective and complete monitoring system. The monitoring project should be matched with the design scheme of foundation pit project and construction conditions.4.2 Instrument monitoring 4.2.1 The instrument monitoring project of foundation pit project should be selected according to table 4.2.1.4.2 When there are subway, tunnel or other buildings (structures) and facilities around the foundation pit which have special requirements on displacement (settlement), the specific monitoring project should be determined by consulting with the relevant departments or units.4.3 Inspection and checking 4.3.1 During the whole construction period of foundation pit project, there should be a person to carry out inspection every day. 4.3.2 Foundation pit project inspection should include the following main contents: 1 support structure (1) support structure molding quality; (2) crown beams, supports, purlins, cracks; (3) supports, columns, there is no large deformation; (4) stopping curtain cracking, seepage; (5) after the wall of the soil there is no subsidence, (5) whether the soil behind the wall has subsidence, cracks and slippage; (6) whether the pit has gushing soil, quicksand and pipe surge. 2 Construction conditions (1) Is there any difference between the soil condition exposed after excavation and the geotechnical investigation report; (2) Is the section length and layered thickness of the foundation pit excavation consistent with the design requirements, and is there any over-length and over-depth excavation; (3) Is the surface water and groundwater discharge condition of the site normal, and is the facility of foundation pit descending and recharging functioning normally; (4) Is there any over-pile loading around the ground of the foundation pit? 3 Environment around the foundation pit (1) Whether there is any damage or leakage of underground pipeline; (2) Whether there is any crack in the neighboring buildings (structures); (3) Whether there is any crack or subsidence in the neighboring roads (ground); (4) Construction of neighboring foundation pit and buildings (structures). 4 Monitoring facilities (1) Reference point, measurement point intact condition; (2) whether there are obstacles affecting the observation work; (3) monitoring components intact and protection. 5 Other inspection contents determined according to the design requirements or local experience. 4.3.4 The inspection method of inspection is based on visual inspection, which can be supplemented by hammer, brazier, measuring tape, magnifying glass and other instruments, as well as equipment such as camera, photography, etc. 4.3.5 Detailed records shall be made for the inspection of the natural conditions, supporting structure, construction conditions, surrounding environment, monitoring facilities, etc. If any abnormality is found, it shall be notified to the monitoring facilities in time. If any abnormality is found, the client and relevant units shall be notified in time.4.3.6 The inspection records shall be organized in time and analyzed comprehensively with the instrumental monitoring data. Arrangement of Monitoring Points5.1 General Provisions5.1.1 The arrangement of monitoring points of pit engineering shall reflect the actual state of monitoring object and its change trend to the maximum extent, and shall meet the requirements of monitoring.5.1.2 The arrangement of monitoring points of pit engineering shall not impede the normal work of the monitoring object, and minimize the adverse impact on construction operation.5.1.3 The monitoring signs shall be solid, obvious and reasonable in structure, and the monitoring points shall be located to avoid obstacles and to facilitate the construction work. The location of monitoring points should avoid obstacles and be convenient for observation.5.1.4 In the representative part of the monitoring object where the internal force and deformation change greatly and the key guarding part of the perimeter, the monitoring points should be encrypted appropriately.5.1.5 The protection of the monitoring points should be strengthened, and the protective devices or protective facilities of the monitoring points should be set up if necessary.5.2 Base pit and supporting structure5.2.1 The monitoring points for the horizontal and vertical displacement at the top of the slope of base pit should be arranged along the perimeter of the base pit, and the monitoring points for the perimeter of the base pit should be arranged along the perimeter of the base pit. The monitoring points should be arranged along the perimeter of the pit, and the monitoring points should be arranged in the middle of the perimeter of the pit and at the corners of the sun. The distance between monitoring points should not be more than 20m, and the number of monitoring points on each side should not be less than 3. The monitoring points should be set on the top of the slopes of the foundation pit.5.2.2 Horizontal and vertical displacement monitoring points on the top of the enclosure wall should be arranged along the periphery of the enclosure wall, and monitoring points should be arranged in the middle and at the sunny corners of the periphery of the enclosure wall. The spacing of monitoring points should not be more than 20m, and the number of monitoring points on each side should not be less than 3. Monitoring points should be set on the crown beam.5.2.3 Deep horizontal displacement monitoring holes should be arranged in the pit slope, the center of the perimeter of the enclosure wall and representative parts, the number and spacing depending on the circumstances, but each side should be set at least 1 ...... >>
Question 10: pit support and pile foundation construction need to be equipped with what test and inspection instruments pit support used, prestressing tensioning test, equipment hydraulic jack, pile foundation need to carry out single pile bearing capacity and low strain testing, if CFG pile, to test the composite bearing capacity, generally by the construction unit to hire a third party agency with testing qualifications testing