Leveling point putright: 1, with the DS3 type level for the building elevation measurement. 2, according to the landlord will provide the survey by the planning department setting putright si
te construction water level on schedule, with precision level closed back and forth several times, laying of site construction with four leveling points S1, S2, S3, S4, construction elevation transmission as the basis, in order to check each other. See leveling point monument embedding figure. 3, site leveling point measuring method and accuracy requirement according to the measurement of the engineering requirements, the project of the elevation control network using third level measurement method. (5) excavation measurements: 1, the excavation positioning measurement: (1) on the basis of the project construction site plan, determine the excavation of horizontal, vertical shaft line. Its control piles should as far as possible away from the foundation pit edge and well protected, so as to avoid the upper foundation pit displacement deviation occurs, so also for subsequent structure provides the axis of the accurate control of pile construction. (2) in the foundation pit supporting pile for foundation pit earthwork excavation boundary edges. (3) check line: axis adopt the project structure as foundation pit excavation control axis, set side of foundation pit excavation, and completes the control of pile. By testing personnel qualified self-checking, again by the builder (master) recheck, full-time qualitative check member ZhuanJian. After the confirmation and correct declaration of supervision company test line, and apply for planning survey department inspection line. Qualified rear can for pit earthwork excavation. 2, the foundation pit construction height measurement: (1) according to the layout of standard field leveling network control points, using high precision level around the foundation pit arrangement elevation datum, this point elevation control of foundation pit excavation. (2) the basal level of control: to ensure that no overbreak, from the basement design layout and elevation of 0.3 m into the elevation, and copy the elevation, horizontal elevation lines to control by digging deep foundation pit. Underground engineering construction survey: 1, the underground structure plane control: 1) first putright building on the foundation pad axis intersection, and then according to the basic plane pop-up all axis and buildings outside. Axis control points (2) be moved to the side of foundation pit, and set the stake as underground structure plane control points, the axis plane control points and control network for the review of the axis position. Axis (3) in the foundation construction process, to control vehicle is forbidden in the 3 m around pile and pile up the weight, and once every half moon survey, in case of pile displacement influence precision. (4) each after the construction period of the axis of the layout, shall be self-checking, in a timely manner after the qualified inspection list, with inspection content measurement results table, so as to timely verify the correctness of each axis. 2, elevation control of underground structures:
For foundation construction, the elevation can be gradually from the scene in the inland waters on time to the bottom of the channel, and at the edge of the slot position setting appropriate level. When foundation construction, but from the bottom of the channel level point up, also can direct from the site in the inland waters on time, either way, should be closed back and forth, error control within the specification requirements. The main structure of the control plane 1, with the scene to the control of set axis positioning control of basis used by the pile for retest, after check and correct, as the basis of the first layer construction. 2, in the first floor with four control points, as the upper structure axis transmission benchmark. Set the base is made of embedded steel plate (100 * 100), and the score sheet metal tags "ten" word, the axis of the upper structure using laser straight. In each layer of the structure of the corresponding parts retained 150 x 150 holes, so that the laser, in order to ensure the accuracy of the axis transmission, upward from the first layer of basis points for each layer of the axis of the relay. 3, to meet the requirements of the precision of the control network, this project adopts the J2 theodolite, a back Angle measurement, two back into line. When measured in accordance with the measurement of the engineering water straight Angle observation and technical requirements of electro-optical distance, and do measurement record. The main structure of the leveling: Provide elevation control points according to owner, each putright 2 elevation control points SM1, SM2 as a basis for the elevation transmission, SMl, SM2 elevations are set to + / - 0.00, two control points should check each other. The poor should be less than 3 ㎜ mutually, the average point of copy and two horizontal line. Copy at ordinary times, as far as possible put level in the center of the measuring point, and a precision is flat. Construction layer copy before, should first check surrendered layer to pass up two elevation points, the less each other should be less than 3 mm, the average point of copy and two horizontal line. Copy at ordinary times, as far as possible put level in the center of the measuring point, and a precision is flat. Template is dismantled, should be in each layer of the pop-up 0.5 m line (50 line elevation for each layer board building elevation + 500), as the basis of decoration, installation. In each layer after the concrete pouring, flung out the posts of longitudinal reinforcement on the lm line, highlighted in red triangle, and as the starting point for the structure height measurement. Building settlement observation: According to the tianjin file, entrust a qualified third party in tianjin unit of measure for deformation observation, at the same time, our company will do some deformation observation and records. 1, the preparation of settlement observation point: the precision level and the supporting the use of the level ruler. 2, and level of Settings: settlement observation should be performed on the basis of stable good leveling points, leveling points should be considered a permanent use, check for each other, embedding location must be stable, not affected by the construction mechanical bruising, prevent leveling point elevation changes. 3, the standard point of closing level line between measurement, the closure must conform to the requirements of the specification, this project adopts the S3 type level, measured according to the
requirements of national second-class leveling technology. 4 settlement observation termination time: general for the first time to install observation points after a solid in a timely manner. By the regulation again after the completion of the foundation buried permanent observation point. Then each layer, the construction of retest once, until completion. Depending on the subsidence quantity size and settling velocity in the future. 5, in the process of observation, when building a larger settlement, uneven settlement, or cracks in shall promptly get in touch with the construction unit and design unit, take corresponding measures to ensure engineering quality. June, settlement observation is a long-term and systematic observation. In order to guarantee the correctness of the observations, truthfully reflect the building settlement, should be four fixed: the fixed personnel observation and sorting result; Fixed instrument, the level of using a fixed point, in accordance with the provisions, the date, method and route. Earthwork construction Based on excavated floor plan Description: put the slope scale: 1:0.5, the axis 2 m wide, the average operating surface width: 600, 300 blind ditch drainage width. Construction conditions All levels of support system to meet the design strength of rear earth excavation can be 100%. Must have fallen to the excavation face is not less than 0.5 m in just under excavation work can be performed. Construction preparation Before this project construction, want to combine party a contact with relevant departments such as planning, understanding the direction of the underground pipeline, embedment depth, and so on and so forth, at the scene with the grey line and timber identification, construction, to disclosure of operating personnel, dig out line contact with the relevant departments in a timely manner, can deepen deepens, can divert diversions of traffic, as far as possible out of the building. The ground facilities, such as trees, walls, etc., should contact the relevant departments according to actual condition, take timely measures, to ensure the smooth progress of construction. Excavation should be ready before technical clarificaiton, make all personnel participating in the construction of construction requirements and steps for all know fairly well. In front of the earthwork excavation, should be done ahead of the vehicle pass and related matters, and safe driving education for all drivers. To assure the construction smoothly. The city appearance and sanitation of all relevant formalities in advance. Conditions of mechanical tissue Earthwork excavation Using segmented excavation of foundation pit excavation, section construction excavation method, shall not be more than 3.0 m, each layer excavation depth limit of digging. Excavation can be designed by machine to dig into the basement first more than 0.3 m, its soil by artificial invisible. In the excavation of foundation pit retaining piles and engineering piles shall not be collision. Excavated homework by construction foreman with groove, strictly control the elevation of digging. 0.5 m within the scope of engineering pile soil by artificial stripping. In construction of the rainy season, after the excavation of slope toe to take protective measures, the slope of the barbed wire injection C15 concrete for processing, the thickness of 50 mm, slope protection, appropriate USES pile sand bag or on the second floor to reinforce cement mortar
method such as bricklaying. When digging in underground structures or pipelines, should inform technology, according to the specific situation, formulate feasible treatment scheme. Over the border protection measures Trough a 1200 mm high steel guardrail, hanging safety sign lights at night, fence post roots fixed firmly, and hung close eye safety net a with steel tube bundle is firm. Construction personnel from top to bottom, set up steel pipe inclined ladder, up and down both ends fixed up, middle and the pit wall attachment point. Oblique ladder both sides armrest, ensure the safety of construction personnel. Top 3.0 m within it is strictly prohibited to stack, 3.0 m overload shall not exceed 10 kpa, construction tower crane base shall be reinforcement. Earthwork backfilling Before filling, the loose soil foundation pit and clean up trash, debris, etc, and the leveling at the grass-roots level. Before paving earth material, completes the level elevation control. Backfill construction shall be continuous and shall consolidate, using mechanical compaction, thickness of each layer soil shop 25 ~ 35 cm, and shall timely ram (pressure). Foundation pit backfill should be layered PuTan, each layer of virtual height is 250 mm, with frog hammer from pit in ram to middle route back to form, ram for 3 ~ 4 times. Ram should be one and a half ram pressure rammer, tamping rammer, okay, shall not be leakage ram. Vibrating impact ram and frog hammer Should be done when the earthwork backfilling, the complete documentation. Test report to indicate the soil type, the design requirements of soil dry density, the test date, test results and test personnel signature file. Foundation pit and indoor fill, each layer of a group of 100 ~ 500 m2 sampling, but a lot of each layer in a group; Base backfill every 20 m3 ~ 50 m3 sample a set, each layer are a lot of a group, sampling location in the lower half of each layer after compaction. Backfill soil compaction test after the dry density of soil should be 100%.