[Sample of earthwork excavation construction scheme] Template of foundation pit excavation construction scheme

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Earthwork construction scheme

I. Basis for compilation

The main basis for the preparation of construction drawings: bidding documents, design drawings, construction organization design of engineering projects; Current codes and regulations of the Ministry of Construction. The main specifications and procedures are as follows:

Technical specification for safety of earthwork in building construction JGJ 180

Code for Acceptance of Construction Quality of Building Foundation Engineering GB50202-2002

Code for Construction and Acceptance of Earthwork and Blasting Engineering (GB5020 1-20 12)

Unified standard for construction quality acceptance of building engineering (GB50300-200 1)

Second, the project overview

Yinchuan College of China University of Mining and Technology is located in Xixia District of Yinchuan City, east of Jinbo North Road, west of Li Ziyuan North Road, south of the planned North Third Ring Road and north of Military Region Road.

The proposed C2 restaurant is located in the east of the completed Phase I C 1 restaurant, and the south of it is the completed Phase I B 1 dormitory building. The survey site used to be farmland, but now it is open space (green space). The specific location of the proposed building (corner pile) has been marked by Party A during the survey. The elevation of this survey is height system in the Yellow Sea, and the intersection of the center lines of the restaurant C 1 North and South campus roads in the northwest corner of the proposed site is the absolute elevation reference point BM (provided by Party A, the known elevation is 1 109.45m). The elevation of each borehole orifice (height system in the Yellow Sea) is measured at 65438+ with a level, which is slightly lower than the surrounding campus roads, about 0.

The landform of the site belongs to the trailing edge of the second terrace in Yinchuan Plain alluvial by the Yellow River. There are no adverse geological processes and buried objects such as hidden dikes, earth caves and graves underground.

Three. Construction Layout The earthwork excavation scale of this project is relatively large. In order to facilitate the construction organization and management, speed up the construction progress and ensure the smooth progress of the project, it is necessary to divide the project into different construction areas and organize the construction respectively.

1, construction area division principle

1) The earthwork volume in each construction area is basically balanced.

2) All construction areas have convenient roads.

3) Use the proposed building as the zoning boundary.

4) Easy first, then difficult, less first, then more, and key processes are preferred.

2, the construction site layout principle

According to the earthwork excavation, geological structure and surrounding environmental conditions of this project, various environmental factors and construction needs should be fully considered in site layout, and the principles to be followed in layout are as follows:

1) The site layout should be arranged with the progress of the project construction, and the stage layout should be adapted to the key points of the current construction.

2) In the plane layout, give full consideration to the optimized and reasonable layout of construction machinery and equipment, roads, on-site entrances and exits, and temporary storage sites.

3) Temporary power supply and wires should be laid in places where falling objects can easily hit them, and the wires should be buried as much as possible.

4) Strengthen site safety management, and conduct management in strict accordance with the requirements of the project safety management manual.

5) Strengthen environmental protection and civilized construction management, so that the project site is always in a clean, hygienic, orderly and reasonable state.

6) Set up on-site roads that are convenient for large transport vehicles to pass through and ensure their reliability.

Fourth, the construction conditions

On-site water and electricity (secondary tank) shall be taken from nearby, and the drainage shall be discharged into the built temporary drainage ditch nearby. Dewatering slope protection yard is temporarily arranged on the west side of the site.

Arrangement sequence of earthwork excavation

1), the surveyors will measure the plane control range of the excavation of the unearthed party according to the design drawings, and release the upper and lower opening lines of the earthwork excavation (pay-off will be measured by layers along with the excavation).

2), surveyors must have complete certificates, and construction can only be carried out after being audited by relevant departments of the management department.

Verb (abbreviation of verb) construction preparation

1) technical preparations

A, the project department earthwork construction team selection, form a strong earthwork construction team and implement.

Machinery and equipment involved in earthwork construction of this project.

B, organize engineers and technicians to be familiar with the construction drawings, prepare detailed construction operation plans for digging, earthmoving and spoil, conduct technical, safety and fire prevention training, and make technical and safety disclosure.

C grid measurement of original terrain, earthwork excavation calculation, earthwork and spoil calculation.

Implement the spoil ground and earth-moving route.

E) Prepare the implementation measures for civilized soil removal and abandonment.

2) Construction preparation work

Conduct a comprehensive overhaul of the construction machinery and equipment entering the site to ensure the normal operation of the equipment before construction. B, preparation of earthwork excavation schedule, arrange the construction sequence.

C earthwork excavation professional construction team admission, and pre-job training and education.

Materials, machinery and equipment, etc. Will be arranged in the admission plan to meet the requirements of continuous construction.

3) Site preparation work

Layout elevation control network.

B, delimit the scope of earthwork excavation, and set up the fence of the construction scope.

C, earthwork excavation construction road and earthwork transportation road layout, delineation and construction. D, set up power and lighting lines, and connect construction water pipelines.

E washing equipment and grit chamber are set at the entrance and exit.

Go through the construction application procedures and other related procedures.

Six, earthwork excavation scheme

1 Determination of excavation boundary:

First of all, surveyors determine the axis of the foundation pit of this project according to the control points provided by the owner; Then add 600㎜ working faces on both sides of the outer edge line of foundation concrete cushion, determine the bottom line of foundation pit excavation, and then slope excavation according to 1: 0.3; Deep foundation pits, such as fire-fighting wastewater collection ponds, are excavated by two-stage sloping. Firstly, the upper opening line of foundation pit excavation is set out according to the second-stage sloping plus the width of the intermediate platform and the width of the working face at the bottom of the pit, and the slope is set to the middle of the deep foundation pit according to the excavation sideline 1: 1, that is,1.60m. Then, after deducting the intermediate platform with the width of 100 mm, the next-stage slope excavation sideline is set out. In the process of concrete foundation pit excavation, combined with the actual excavation,

2 excavation method:

1), mechanical digging, slope repair with digging. When the excavation is within 500 mm from the bottom of the pit, surveyors will copy a 500 mm horizontal line, nail a small wooden stake with horizontal elevation at the bottom of the foundation pit, copy a number of reference points in the foundation pit, pull the line for leveling, and reserve 300 mm soil layer for manual cleaning.

2), mechanical excavation to the last step, surveyors immediately release the foundation pile cap line, 300 mm reserved soil layer is dug up manually, and cleaned and leveled, and the cushion layer is poured in time to prevent the evaporation loss of moisture in the basement soil and cause soil expansion.

3 excavation matters needing attention:

1), drainage measures are taken around the bottom of the pit and the top of the slope, intercepting ditches are set on the ground, collecting wells are set in the foundation pit, and 300W*300H drainage ditches are excavated along the bottom of the pit to make water flow in.

1000l *1000b *1000h collecting well is pumped to the rainwater grit chamber required by the owner and finally discharged into the rainwater ditch. Prevent rainwater and groundwater from soaking the foundation soil, check the stability of the soil wall routinely every day and rainy days, and continue the operation after determining the safety situation.

2) Pay attention to safety during mechanical excavation, parking, entering and leaving the site, cooperate with earthwork excavation and transportation at any time, do a good job of site cleaning and achieve civilized construction.

4 handling of abnormal situations:

During excavation, construction personnel should always pay attention to the changes of soil quality and slope stability of foundation pit, and report any abnormality immediately.

(1) If there are hidden streams or weak interlayers in the site, all the mud shall be removed and compacted with sand and gravel to the design elevation;

(2) If there are signs of collapse during excavation, the construction shall be stopped immediately, and the owner shall be reported and emergency measures shall be taken actively to block the collapse site while transferring workers; Surveyors set observation points according to landslide symptoms to observe the plane and vertical displacement of the slope, providing important original data for emergency measures.

5 earthwork backfill:

1) Before backfilling, the garbage and other sundries at the bottom of the foundation pit or on the ground shall be cleaned up. Before backfilling the fertilizer tank, it must be cleaned up to the bottom elevation of the foundation, and the scattered loose garbage, mortar, stones and other sundries must be cleaned up.

2) Check the quality of backfill soil for sundries, whether the particle size meets the requirements, and whether the moisture content of backfill soil is within the control range; If the water content is high, measures such as scarifying, airing or evenly mixing dry soil can be adopted; When the water content of backfill soil is low, measures such as watering and wetting in advance can be taken.

3) Backfilling shall be carried out by layers. The paving thickness of each layer should be determined according to the soil quality, compactness requirements and mechanical properties. Generally, the thickness of each layer of frog rammer is 200 ~ 250mm；; ; Artificial tamping is not more than 200 mm, and after each layer is paved, it should be raked flat.

4) Each layer of backfill soil shall be compacted at least three times. Tamping should be one and a half tamping, tamping should be connected, and rows should be connected and crossed. It is also forbidden to use the so-called "water rammer" method to sink the soil by pouring water.

5) When backfilling two deep foundation pits, the deep foundation pits should be filled and compacted first, and then filled and compacted together with the shallow foundation when reaching the same elevation as the shallow foundation pit. If it must be rammed separately, the junction should be filled into a trapezoid, and the height-width ratio of the trapezoid is generally 1: 2. The staggered joint distance between upper and lower floors should not be less than1.0m. ..

6) When backfilling the house center and pipe trench, in order to prevent the center line of the pipeline from shifting or damaging the pipeline, both sides of the pipeline shall be tamped with artificial fill. And shall be carried out by both sides of the pipeline at the same time, until the top of the pipeline is more than 0.5 m. Under the condition of not damaging the pipeline, the wow rammer can be used for tamping. Fine particles should be backfilled around the tape wiping interface, anti-corrosion insulation layer or cable. After each layer of backfill soil is compacted, ring knife sampling should be carried out according to the specifications to measure the mass density of dry soil; After meeting the requirements, lay the next layer of soil.

7) After trimming and leveling, the surface shall be leveled by pulling wires after filling. The places exceeding the standard elevation shall be leveled in time according to the line, and the places below the standard elevation shall be filled and compacted.

Seven, quality and technical organization measures

Establish a quality assurance system with the project manager as the person in charge. Before starting work, organize all the personnel entering the site to learn the construction scheme, familiarize themselves with the drawings and geological conditions, and make technical disclosure to the mechanical operators to master the key points of construction technology. Before the start of each working procedure, learn the specification requirements and carefully construct. Strict self-inspection after completion, resolutely rework those who fail, and carry out the whole process quality management according to the international ISO9002 certification standards and requirements.

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1 elevation +0 -50 elevation inspection

2 Length and width -0 are measured from the design center to both sides.

3 slope scale inspection is not allowed for the slope.

Eight, the main management measures

1. Technical measures for safety management and protection

Strictly control the site safety protection according to the occupational health and safety management manual and program documents of our company. A safety leading group shall be set up at the site, and a full-time security officer shall be set up at the site to be fully responsible for safety production and various safety education activities. The Engineering Department will organize relevant departments to inspect the site on a regular basis, and organize personnel to rectify in time when hidden dangers are found. Make sure there is no serious accident.

According to the construction situation in each stage, posters, color codes, signs and slogans are hung at entrances and exits and dangerous areas, and all kinds of protective components are protected in place. All kinds of signs should be hung in a conspicuous position, in line with OHSAS 1800 1 standard.

Foundation pit protection

1) The underground pipe network needs to be proved for earthwork excavation to prevent accidents;

2) Two Φ 48 steel pipe protective railings are set about 0.6m away from the foundation pit edge between the vertical poles.

The distance is 4m, which is higher than the natural terrace 1.8m, and the buried depth is 0.8m. It is forbidden to pile soil, materials and tools within the upper edge of foundation pit1m.. All construction personnel are prohibited from jumping over protective railings. Warning signs should be set up during foundation pit construction and red light signs should be added at night;

3) Construction personnel outside the foundation pit shall not throw things into the foundation pit, and shall not pass tools under the foundation pit.

Don't let go until it is firmly connected;

4) people under the pit should stay away from the edge of foundation pit and slope to rest, in case of carelessness;

5) All construction machinery shall obey the command, and the personnel shall stay away from the construction machinery as far as possible. If necessary,

Before approaching, first notify the operator and wait for a response.

8.2 field capacity management measures on the construction site

1) The principle of "whoever is in charge is responsible" is implemented in the construction site. The project manager of the construction site is fully responsible for the management of the construction site, and all units and individuals related to the construction activities of the construction project must obey the management.

2) The on-site construction road is concrete pavement, which should be kept clear. It is forbidden to pile up materials and equipment on the pavement; There are practical drainage measures in rainy season, equipped with 4-inch submersible pump 10, and drainage ditch is set on site to discharge the rainwater on site into the original rainwater pipeline in time;

3) Earthmoving machinery and materials entering the site shall be neatly stacked when not in use, and shall not be confused.

Arrange special personnel to keep the site clean and tidy every day;

4) All personnel entering the construction site must wear safety helmets, and non-construction personnel are not allowed to enter the construction site;

5) All kinds of machinery should be maintained regularly, and the mechanical operators should establish a post responsibility system, so that they can work with certificates, and it is forbidden to operate without a license;

6) When the weather is dry, water should be sprinkled on the spot to reduce dust;

7) All management personnel on the construction site wear badges.

2. Environmental protection measures:

1) Earthwork shall be constructed by a qualified transportation unit, and a transportation contract shall be signed, which specifies the company's environmental protection requirements. At the entrance and exit of the construction site, designated personnel shall clean the wheels and take photos of the vehicles or cover them tightly. The highest point of earthwork of the carrying project shall not exceed the upper edge of the car trough by 50CM, and the edge shall not be higher than the upper edge of the car trough 10CM. It is forbidden to spill along the way. And arrange someone to be responsible for cleaning the road.

2) When the construction site is dry, water should be sprinkled to prevent the dust from flying;

3) Building materials shall not be piled up on the construction road to ensure smooth transportation;

3. On-site fire safety management measures

1) set up fire prevention leading group, volunteer firemen, security Council and social comprehensive management group at the construction site, set up a leading cadre to be responsible for fire control and public security work, and establish a system of holding regular meetings once a month.

2) Adhere to the working principle of "prevention first, combining prevention with elimination" in the construction site work, conscientiously implement the Fire Protection Law of People's Republic of China (PRC) and the Fire Protection Regulations of Jiangsu Province, implement the fire prevention responsibility system step by step, and conduct extensive publicity and education for employees through various forms to ensure that everyone attaches importance to fire control work; At the same time, the fire control work will be included in the production management schedule, and it will be planned, arranged, checked, implemented and compared with production.

3) Before entering the site, all personnel participating in the construction shall be educated and assessed on "Four Preventions". Adhere to the clear system, safe production and civilized construction for workers in major festivals and social and political activities every month.

4) Non-flammable materials shall be used for temporary site setting, and education shall be conducted in advance to learn the rules and regulations of the site and national laws and regulations, so that the living, processing, warehousing, office and construction in progress of each construction site are set separately;

5) Management of special classified warehouses for inflammable and highly toxic articles, with strict access. 6) Strengthen the management of on-site open flame operation, strictly go through the examination and approval procedures for the warehouse with fire, ensure good ventilation when operating inflammable and explosive hazardous chemicals, and prohibit cross operation with open flame operation such as electric welding. . On-site hot work certificate shall be issued by the person in charge of safety in a unified way, with written technical disclosure on safety and fire prevention.

7) Set up a smoking area on the site, post smoking management requirements and signs in obvious positions, and equip cigarette butts containers and fire-fighting equipment. Smoking is prohibited in the smoking area and other places on the site.

8) Erecting lighting lines and installing all kinds of electrical equipment on site must be operated by regular electricians.

Non-electrician personnel are not allowed to operate;

9) The fire-fighting equipment on the construction site shall be inspected by the security guards to ensure that the fire-fighting equipment is in good condition and effective, and others shall not move or misuse it without authorization; The road width at the construction site shall not be less than 3.5m ..

10) Adhere to the principle of "who is in charge, who is responsible, who is responsible for the construction" for the protection of key parts and finished products on site, and implement the responsibility to people. According to the actual situation on site, reduce the number of entrances and exits, and control personnel access by sections. Specific measures shall be formulated by security guards.

Nine, slot inspection

After the foundation pit (trough) is excavated and cleaned, before the foundation construction, the supervision unit shall organize the magnifying glass unit, the design unit and the construction unit to inspect the trough together to check whether the excavation quality of the foundation pit (trough) and the foundation soil are in conformity with the design.

The main contents and methods of slot inspection are as follows

1) Check whether the length, width and excavation depth of the foundation pit (groove) are correct and whether the slope is steep.

2) Observe the distribution and trend of the soil layer on the trench wall, preliminarily judge whether the soil layer required by the design has been dug, and pay special attention to observe whether the soil quality is consistent with the geological data and whether it needs to be treated.

3) Observe whether there is any local abnormal phenomenon, and if there is, deal with it in conjunction with relevant units such as design.

4) When checking the groove, make a detailed record of the important parts of the structure, that is, the parts with large stress or settlement (such as bearing walls, corners, column feet, etc.). ).

Construction scheme of earthwork excavation of Shanghai Baoye Construction Co., Ltd.

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