The Application of Concrete Spacers: Super - full analysis of bridge pile foundation construction

一、The preparation of pre-construction
1, Familiar with the drawings before starting to understand the requirements of the construction and structural characteristics of the structure of the material for the various parts of the material to be aware of, with the measurement staff to the construction site to see the location of each structure and the surrounding terrain and do the record (cable, gas, etc.), to facilitate future construction.
2, learn the contents of the construction subcontract, clear the rights and responsibilities.
3, familiar with the list of contracts, a clear list of the amount of engineering can be measured.

(Removal of structures, felling trees, digging roots, etc. to be confirmed on-site construction costs and measures)

二、The formal construction
With the start conditions, build a construction sidewalk, construction team approach, combined with the relevant personnel to solve the construction team of electricity, water, accommodation and personnel registration and other issues. Contact the technical department issued construction drawings, construction instructions and technical exchanges and so on. If the drawings change should be promptly notify the construction staff, and then issued the construction team to adjust the arrangements.

Construction process of local problems, promptly notify the administrative staff to contact Party A to solve the problem. For the hidden project need to leave the construction photos of the timely notice of business personnel to take image data. In the construction process, the need for small materials provided by the project department, in advance to do a good job planning plan consult manager approved, notify the procurement department to purchase. At the end of the month, the statistics of the project completed this month, and open a bill to the business staff audit.
1. Drill type selection
Currently on the road more commonly used rigs are rotary drilling drill, rotary drilling machine (positive circulation, reverse circulation), impact drill.
Rotary drilling drilling construction speed, environmental protection, but the higher cost.
Applicable terrain: clay, silt, sand, muddy soil, artificial backfill and

Contains some pebbles, gravel layers.

The maneuvering cost is reliable, the construction is no noise, the cost is low, but the hole speed is slow, the mud effluent pollutes the environment. Positive circulation for terrain: clay, sand, pebble particle size less than 2cm, less than 20% of the gravel soil, soft rock. Reverse circulation for terrain: cohesive soil, sand, pebbles smaller than the diameter of 2/3, the content of less than 20% of the gravel, soft rock.

The percussion drill into the hole slowly, big vibration. Applicable terrain: Loess clay or silty soil and artificial miscellaneous soil layer, especially suitable for the stone in the gravel layer, boulder layer, hard soil, rock formation.

Combined with engineering geology The project can be used with rotary drilling drill, rotary drill.

2.Construction preparation
A. The site is flat
B. Post Stakeout
C. Buried Casing
D. Drilling tool ready and in place
E.Pulping

3.Reinforced protective layer
Reinforcement skeleton protective layer with prefabricated concrete blocks or steel components. The strength of the prefabricated concrete is the same as that of the bored pile. Along the vertical direction of the steel cage is set up every 2m, each channel along the circumference of the symmetrical set of four. The thickness of the protective layer conforms to the design specifications.

4.drilling

Selection of rotary drilling rig drilling. Use the drill bit with the same design of the pile diameter, check the diameter of the drill bit and the wear of the drill bit, and repair the drill bit in time.

5.Clear hole
Drilling depth to reach the design elevation, the hole depth, aperture to check, meet the requirements before the clear hole.

A. Clear the requirements of the hole according to the bridge of the drilling method, equipment and equipment conditions and the formation of the decision, first with a mud pump drill pipe for a clear hole. Measurement of hole depth and mud index, clear hole until the sediment thickness and mud index meet the requirements of the following table.
B. Clear the hole should pay attention to matters ①. In the clear hole slagging, we must pay attention to keep the hole in the hole to prevent collapse. Hole mud surface should not be less than 1.0m below the hole. ②. Do not use deepening the depth of drilling in place of clear hole.

6.Reinforcement cage processing and entry holes
According to the general design requirements, for pile length greater than 40m pile foundation, to lay the sound tube, for the use of acoustic transmission method to check the quality of the pile, less than 40m pile foundation 50% buried sound tube. (Note the joint when the sound tube installation)

7.Sets the catheter
Selection of circular spiral quick connector type catheter, the upper end of the storage hopper.

Catheter diameter of 300mm, length 2.0-4m, and with 1-2 section 1.0 and 0.5m short tube as the adjustment tube. And give the catheter number.

8.Second clear hole
Pouring concrete in strict accordance with the technical specifications of the standard measurement of sediment thickness, sediment thickness exceeds the standard design requirements, to carry out the second clear hole. The secondary clear hole adopts the mud pump connection pipe to use the reverse circulation method. To be sediment thickness and mud indicators qualified before pouring concrete.

9.Pouring underwater concrete

10.Pile foundation detection
When the pile concrete to achieve the design strength, the excavation of the pit, get rid of the pile head (pay attention to protect the sound tube and check the depth), the concrete pile test to determine the quality of concrete pouring pile.

11.Reinforcement method of pouring pile after problem
After the inspection of the cast-in-place pile, it has been found that there are dissipative piles, concrete segregation, voids and other accidents, which can be reinforced by the design representative and the supervising engineer.
Reinforced with pressed cement. Drill two holes, respectively, to make pulp into the pulp with. Depth should be up to the following 1m.
With high-pressure water pump into the hole into the water, so that sandwich mud from the pulp was washed out.
Press the pure water slurry with a water-cement ratio of 0.8
Thick paste into the full pressure should be allowed to spread, when the slurry from the pulp out of the mouth when the pressure to stop the pulp, with crushed stone will be sealed, and sacks to block.
Finally, with water cement than 0.4 into the cement slurry, the pressure increased to 0.7 ~ 0.8MPa close into the pulp valve, pressure pressure slurry 20 ~ 25min, grouting reinforcement work end.
After the cement slurry hardened, it should be re-drilling core inspection reinforcement effect.

Ending ....

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