However, the underground binding and electric welding work load is large, which is harmful to the health of workers.
The collapsed area shall be filled with block stones, and the wall protection shall be properly reinforced.
The wellhead is dense and the lower part is sparse.
3.1.2 before the concrete pouring of the pile body, the section clearance shall be checked and the concrete wall shall be roughened.
Check the design on site, measure the pile position according to the design, carry out construction setting out, accurately mark the pile center position with bamboo sheet pile coated with red paint, and measure the elevation of each pile position.
In order to prevent the deformation of the reinforcement cage in the process of handling and lowering, each section of reinforcement cage can be added with two stiffening stirrups with a diameter of 25-28mm or steel rails and profile steel.
During setting out, each side shall be slightly larger than the design size (generally 5cm) according to the specific conditions of the construction site and the possible construction errors.
The concrete pouring must be carried out continuously without forming horizontal construction joints.
The rock excavated at the bottom can be spent or not supported according to the situation.
(5) The high-voltage power transmission circuit and low-voltage lighting, generator and power transformation and distribution equipment, blasting materials, communication equipment, pipelines and installation materials for the well are provided.
The reinforcement at the collapse shall be properly densified.
The concrete slump shall be controlled within 70-90mm, and can be relaxed to 100-140mm when the vibration is inconvenient.
The disturbed loose soil or spoil is 0.6 ～ 1.00.25 ～ 0.30 ① the water bearing layer is flexibly controlled; ② The section of the wellhead should be 0.3-0.5m2 higher than the ground, 1.0-1.50.20-0.253 dense clay, sand clay mixed with pebbles and gravel, 1.5-2.00.2 ② wood support.
After the reinforcement cage is in place, the distance between the reinforcement cage and the retaining wall shall be wedged with concrete blocks.
Click the blue words above to pay attention to our anti slide pile construction operation instruction 1.
(3) In order to ensure the safety of construction personnel, the wellhead shall be provided with protective railings (those with thin shell support higher than the ground may not be provided) and foot plates for the lifting personnel to load and unload materials and the opening and closing of the wellhead.
(2) Arc stone or bedrock shall be blasted; In the hard soil below the sliding surface, it is also necessary to loosen the soil by blasting in order to speed up the construction progress.
The other is to conduct overall lifting according to the lifting equipment and the depth of anti slide pile, prefabricated the reinforcement into 5-7m reinforcement cages for each section, and then put them into the shaft one by one for lap welding.
3.1.1 fabrication and installation of reinforcement cage reinforcement binding and welding positioning: there are two methods for binding reinforcement, one is to place a single reinforcement under the shaft for positioning and binding.
The deflection of the central axis of the hole shall not be greater than 0.5% of the hole depth, and the section size must meet the design requirements..
In case of arc stone, the charge can be appropriately reduced; ② When there are many blastholes in the well, the charge amount of each hole shall be controlled according to the total charge amount; otherwise, the charge amount shall be controlled according to the hole depth.
(4) Prepare special movable bottom box, bucket and 0.5T winder for lifting.
2.
(2) Level the surface of the orifice and set up surface interception, drainage and seepage prevention facilities.
(2) Treatment of shaft wall collapse: during the construction process, if the collapse area is small due to weak and loose soil layer, groundwater action, or blasting action, the blasting in the well and adjacent areas must be strictly controlled, and the wall protection support must be carried out immediately.
Scope of application this operation instruction is applicable to the anti slide pile construction operation, and other projects can refer to it when necessary.
Then level the orifice site.
Before the pouring concrete reaches 80% of the design strength, the formwork top support should not be removed.
Operation preparation (1) survey and setting out.
The formwork top support shall not be removed before the pouring concrete reaches 80% of the design strength.
When the rock mass shows signs of sliding or the construction speed needs to be accelerated, contact the central laboratory to prepare quick setting and early strength concrete.
Support shall be provided immediately.
During the construction in rainy season, a canopy shall be set up and the orifice shall be locked.
Refer to the following table for the number and charge amount of the blast holes: refer to the following table for the number and charge amount of the blast holes: refer to the hole section (M2) number of the blast holes (G) 2 × 43～412002.5 × 43~412003 × 33~412003 × 46-71800 notes: ① the charge in the table refers to the hard soil layer.
When the collapse is serious, the soil is too loose and the underground water continues to collapse, the observation must be strengthened, the dangerous rocks and suspended soil must be removed, the joists and hidden columns shall be erected at the collapse, and the wooden wedges and long nails shall be used for reinforcement and nailing, and the inside shall be filled with block stones or waste wood to prevent the earth rock from continuing to collapse.
(3) Excavation and support of well bore ① concrete thin shell wall protection: the excavation depth of each section of concrete thin shell wall protection is 0.6-2.0m, and the thickness of wall protection can be referred to the following table.
Construction procedure and process flow 3.1 construction steps 3.1.1 pile body excavation and support (1) soil excavation shall be manually excavated with short pickaxes, shovels and shovels, and the earth shall be loaded with iron buckets, and the slag shall be lifted by the winder.
3.1 construction process flow chart anti slide pile construction process flow chart 4 quality control points and requirements 4.1 quality control points (1) during the construction process, in order to ensure the safety of construction personnel and the accuracy of building positions, an observation system shall be established, and the accurate observation of landslide mass and building positions shall be arranged to prevent accidents (2) during the excavation process, the clearance size and plane position of the pile body shall be regularly checked.
(6) When there is underground water in the well, submersible pumps or other types of high lift pumps shall also be equipped.
During blasting, attention shall be paid to the hole arrangement and charge amount.
The thickness of retaining wall can refer to the following table for the sequence of soil type, excavation depth of each section (m) and thickness of retaining wall (m): 1.
When the distance between piles is short (5-7m), the interval between excavation and wall protection concrete pouring shall be considered.
The pile body shall be poured in strict accordance with the mix proportion given by the Central Laboratory of the headquarters.
A ridge of appropriate height shall be built on the surface of the orifice to prevent the inflow of surface water.
When the pile hole is located in the accumulation layer or in the place with loose soil, wood support should be used.
Refer to the following table for the blasting charge amount and the minimum distance between the blast hole and the shaft wall: refer to the following table for the blasting charge amount and the minimum distance between the blast hole and the shaft wall: refer to the following table for the blast hole depth (mm) maximum charge amount (G) minimum distance between the blast hole and the shaft wall (mm) 6002003001000300 ~ 400600.
3.
