1. The construction scheme of tie-rod anchor wall has not been found

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contents of retaining wall construction scheme

1. compilation basis ........................................................................................................................................................ ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… Momentum consumption plan …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… Machinery consumption p>1.1 .............................................................................................................................................................................. Specification

GBJ22-83 Code for Construction and Acceptance of Foundation and Foundation Engineering

GB523-98 Code for Construction and Acceptance of Masonry Engineering

GB526-93 Code for Engineering Survey

GBJ26-83 Code for Construction and Acceptance of Timber Structure Engineering

JGJ46- Technical Specification for Electricity Safety

2. General situation of the project and main quantities

2.1. General situation of the project

This section of the line starts from the junction of * * * * * * * * in the west and * * * * * * * in the east, and the starting point of the line is measured with the pile number BI1 (abscissa y = 176517.31).

most of the lines along this section are plains, mainly including alluvial plains and alluvial inclined plains. The hilly areas are mainly concentrated between BI18# pile and Bi22 # pile, mainly high mountains. Hydraulic protection mainly includes slope protection and bank protection for river canals and gullies crossing, and retaining walls and drainage ditches for steep mountains. Retaining walls are set up for soil ridges and steep slopes; For the river banks with unstable soil and serious erosion by the main river, retaining walls are adopted; For river banks or beaches with steady water flow and little erosion, slurry rubble can be used for slope protection. For cohesive soil banks, backfill soil shall be compacted by layers (compaction coefficient is generally .9); When the pipeline is laid by climbing embankment, the side (or both sides) facing the water surface and the riverbank are protected by mortar rubble, and the canals with rubble or cement are restored to their original appearance in the same way as the original protection; For the mountain slope with a slope angle greater than 15, retaining walls and drainage ditches shall be made every 1m.

2.2. Current main engineering quantity

Name of soil and water conservation structure

Drawing number of total engineering quantity unit

Line 18.5 m3 of masonry slope protection -1795

Line 52 m of continuous concrete cover -1795

82 lines of retaining wall -1795

37 lines of drainage ditch -1795

1,196.4m3 of mortar rubble crosses the water surface

Note: the current design quantities listed in the table are

3. Construction procedures and main construction methods

3.1. Construction. Working procedure

3.2. Construction method

The single engineering quantity of hydraulic protection project is small, and at the same time, in order to avoid damaging the pipe body, the foundation pit groove is excavated manually in the construction, and the wall groove is dug by manual rock drilling for the stone section. Submersible pump is used for foundation pit dewatering, generator generates electricity on site, mortar masonry is used for manual masonry, and lime-soil formwork is used on site.

4. Technical measures for construction

4.1. Material selection and technical requirements

Hydraulic protection is a line engineering protection facility, which is of great significance to the protection of pipelines during use, so the technical requirements for hydraulic protection materials are very strict, and strict selection and acceptance must be carried out. The principle of adjusting measures to local conditions, ensuring quality and reducing cost shall be adhered to in material procurement. Materials entering the site must have material certificates, certificates of conformity and relevant certificates, and unqualified products and unlicensed products are prohibited from entering the construction site.

4.1.1. Masonry stone

Stone (mainly block stone) for mortar masonry shall be made of stone with uniform texture, hardness, no cracks and no easy weathering, and the stone surface shall be free of weathered chips, mud marks and dirt. The ultimate compressive strength of the stone shall be above 25Mpa, and the larger stone shall be selected as far as possible for masonry. The block stone shall be roughly square and free 2cm sharp edges. The flaky should have two roughly parallel faces, the thickness of which should not be less than 15cm, and the length of one side should not be less than 3cm. The stone used for hydraulic protection of the West-East Gas Pipeline is mainly block stone, and the stone area in the construction section is mostly aeolian fossils, which does not meet the technical requirements of soil and water conservation masonry. Therefore, the stone used for construction should be mainly purchased, and the place of purchase should be selected in the quarry of Shandan County, with the nearest transportation distance of 26Km and the farthest transportation distance of 82 km, and it should be hauled by dump trucks.

4.1. 2. firstly, qualified sand and cement shall be selected according to the design requirements for masonry mortar. tap water shall be used for mortar mixing, and it shall be purchased from Shandan county with 5T water tanker and delivered to the site, with an average transportation distance of 38Km. It is forbidden to take sewage from the ditch anywhere. R425 ordinary portland cement for cement is purchased in Shandan Cement Plant. The cement entering the site must have the factory certificate, test report and re-inspection report. Its stability, setting time, strength and other indicators must meet the standards, with an average transportation distance of 39Km. Sand is washed medium (fine) sand, which is purchased by Shandan battlefield. Only when the mechanical properties of sand and gravel meet the standards can it be put into use, with an average transportation distance of 29Km. Cement used in the construction site shall be neatly stacked, with the height of bagged cement generally not exceeding 1 bags and the stacking width limited to 5-1 bags. Temporary open-air stacking shall be covered with rain-proof tarpaulin. Generally, the storage time of cement is not more than 3 months. If there is doubt or uncertainty about the quality of cement, recheck the test before use and use it according to the test results. The sand and cement used in the site shall be neatly stacked separately, and shall not be mixed. The sand shall be kept clean, and it is forbidden to be mixed with soil. Mortar for masonry must have timely fluidity and good workability to ensure that mortar joints of masonry are fully filled and compacted. The simple on-site inspection method is to knead it into a small ball by hand, so that it can't seal the pulp and is not loose after letting go. The label of mortar used for masonry in different construction sites and structural forms is strictly controlled according to the design requirements, and mixed mortar is strictly prohibited for masonry walls. Masonry mortar shall be tested quantitatively and in batches, and a set of test pieces for evaluating mortar strength shall be made for a maximum of 1m3 masonry. When the variety, label or mixture ratio of cement changes, another set of specimens shall be made, which shall be used as the basis for measuring the quality of mortar.

4.1. 3. The choice of wood boards depends on the place, and the principle is that it must be hard wood. We choose pine with good texture, and the wood comes from the timber market in Zhangye City. Rigid nails are used to connect the vertical plate of cutoff wall with the wall plate. Use electric drill to drill the drain hole of the board, and stagger the drilling position and the joint of the board with a distance of 2mm.

4.1. 4. Lime-soil is used for building the water cut-off wall of lime-soil for the West-East Gas Transmission Project. Before mixing lime-soil, lime, soil and mixing water must be strictly inspected, sampled and tested, and lime-soil preparation can be carried out only after passing the test. Lime soil shall be mixed mechanically and evenly, and each batch of lime soil shall be sampled and inspected in proportion to ensure that the moisture content is the optimal moisture content, and the field inspection shall be based on "holding the ball in hand and blooming on the ground". Layered compaction should be adopted, with a layer of 3cm as appropriate, and the compaction coefficient should be ≥.94. The soil and water conservation of this bid section is mostly located in Gobi desert and stonework area. It is difficult to borrow the fine soil for lime-soil mixing, so it is necessary to buy soil from the local area. According to the combination with the local government, Shandan Brickyard is selected as the soil, and the dump truck is used to pull the soil, with an average transportation distance of 32km. Drinking water is used for mixing water, which is purchased from Shandan County by tanker and delivered to the site, with an average transportation distance of 38Km.

4.2. Selection of measuring and positioning instruments for structures

Theodolite is generally used for measuring and positioning instruments, and total station is used for measuring and positioning structures on steep slopes crossing large gullies. Theodolite and total station can only be used after re-calibration, and the instruments shall be submitted for inspection before construction, with a calibration certificate. Reference point selection

The engineering coordinates and elevation of structure measurement and positioning are quoted from the coordinate points of pipeline blueprint design pile points. When setting out, theodolite is used to measure the position of each corner of the structure, and control piles are buried as the basis of construction position and pile position transfer in the future, and sketches are drawn on site for record.

4.3 excavation and protection of foundation pit groove

4.3.1 excavation of foundation pit groove

measure the position of positioning pile and the size of the structure according to the structure, set out the foundation pit sideline with white lime, and then carry out foundation pit excavation. In order to avoid damaging the pipeline anticorrosion layer and even the pipe body during excavation, all foundation pits are excavated manually. The hydraulic protection position of this bid section is located in the rocky mountain area and river valley area, and the excavation of foundation pit groove in the rocky area is carried out by manual drilling.

4.3.2 foundation pit dewatering protection

The mountainous area is adjacent to Qijiadian Reservoir, and groundwater will be collected during foundation pit excavation in some areas. Therefore, dewatering measures should be taken at any time during foundation pit trench excavation. Submersible pumps are used for dewatering, and the accumulated water in the foundation pit will be pumped into the pre-dug catchment ditch, and the cross section of the catchment ditch will be discharged by the catchment ditch.

4.4. Masonry with mortar masonry

4.4.1 Masonry technology requires that mortar masonry stone walls adopt staggered masonry method, and double lines are hung according to the shape of the stone, and the flat side of the first layer of stones faces downward, and the upper and lower stones are staggered, overlapped inside and outside, laid stably and stacked in different skins. Mortar masonry shall be laid by slurry laying method. Mortar joints shall be full and compacted. Mortar joints are generally 2-3 mm, and the thickness of slurry laying is about 4-6 mm. Gravel blocks shall be embedded in mortar for large gaps, and it is not allowed to fill gravel in mortar first. Mortar block stones shall not form horizontal or vertical joints, and shall not be twisted. When filling the abdomen with stone, the horizontal mortar joint width shall not be greater than 3cm, and the vertical mortar joint shall not be greater than 4cm. The mortar joint of the filling stone shall be staggered. For jointing on the surface of masonry, if there is no special requirement, an empty seam with a depth of 2cm should be set aside during masonry, and then the seam should be finished with cement mortar, otherwise the empty seam should be cleaned before jointing after the masonry mortar is solidified. Masonry surface jointing adopts flat joint, and the mortar label used for jointing is not lower than that of masonry mortar. Masonry masonry is completed at one time, and construction joints are not allowed to be left at will.

4.4.2 Single masonry measures Reservoir

Before mixing lime soil, a reservoir is dug in the construction site in advance to prepare for construction water. The size of the reservoir depends on the amount of lime soil in this construction site, and the water consumption should be fully met. The inner wall of the reservoir is lined with two layers of plastic sheets, and the size of the plastic sheets should be able to cover the top of the pool to prevent evaporation and debris from falling into the pool. In the hydraulic protection of west-to-east gas transmission project, the pipeline passes through the river or gully in the form of mortar masonry slope protection, and the slope protection masonry adopts block stone. The foundation trench of slope protection is excavated manually, and the basal plain soil is compacted, and the compactness coefficient reaches .9. Mortar block stone shall not form horizontal or vertical joints, and shall not be twisted, and the mortar shall be full. For jointing on the surface of masonry, if there is no special requirement, an empty seam with a depth of 2cm should be set aside during masonry, and then the seam should be finished with cement mortar, otherwise the empty seam should be cleaned before jointing after the masonry mortar is solidified. Masonry surface jointing adopts flat joint, and the mortar label used for jointing is not lower than that of masonry mortar.

4.5. Handover acceptance

4.5.1 Before the pre-acceptance of the project, the contractor shall organize relevant personnel to conduct a comprehensive inspection of its construction project according to the requirements of design and construction drawings and construction standards, and immediately rectify any discrepancy.

4.5.2 when all the projects are completed and conform to the provisions of the contract, the contractor shall apply to the owner or supervisor for completion acceptance.

4.5.3 the problems raised by the contractor in the pre-acceptance of the owner or the supervision organization shall be rectified within the time limit specified by the owner or the supervision organization, and the application for completion shall be submitted again.

4.5.4 the completion data shall be accepted by the owner or supervision organization, and the handover formalities of the completion data shall be handled after acceptance.

5. Technical measures for construction in rainy season

5.1 For projects under construction during rainy season, technical measures for construction in rainy season should be carefully worked out, and specific measures for implementation at different levels and a system of regular inspection should be formulated according to the actual construction situation, so as to facilitate the implementation of technical measures for construction in rainy season.

5.2 according to the actual situation of site layout, do a good job of drainage on the construction site in time.

5.3 protection of temporary facilities and on-site construction equipment:

the temporary facilities on the construction site should be renovated and reinforced before the rain period to ensure no leakage, collapse or collapse, and no water around them. Mechanical and electrical equipment (switchboards, brake boxes, electric welding machines, pumps, etc.) on the construction site shall be provided with reliable rainproof measures (such as building a fortification canopy or setting up a simple mechanical and electrical room, etc.). meanwhile