Occluding pile is A new type of pile row structure, also known as AB pile, in which two different types of piles A and B occlude each other to form A vertical continuum with the functions of retaining soil and intercepting water. The purpose is to make the drained pile not only serve as a retaining member, but also play the role of water interception, so there is no need to set up another water interception curtain. Class A pile plays the role of water interception, and class B pile mainly plays the role of support and water interception. Class A pile is generally plain concrete pile, and class B pile is reinforced concrete pile.
Occlusal pileRefers toA,BTwo different types of piles bite each other to form a vertical continuum with soil retaining and water intercepting functions, which is a new type of pile row structure, also known asABThe pile. The purpose is to make the drained pile not only serve as a retaining member, but also play the role of water interception, so there is no need to set up another water interception curtain.AThe similar pile plays the role of water interception,BThe type pile mainly plays the role of supporting and water cutting.AThe type pile is generally plain concrete pile.BThe class pile is reinforced concrete pile.
Construction requirements:
(1) A guide wall shall be first set at the top of the pile, and the width of the guide wall shall be3～4m, guide wall thickness should be0.3～0.5m.
(2) Adjacent occluding piles should be constructed in the order of plain concrete piles first and then reinforced concrete piles; Before the initial setting of plain concrete pile, the reinforced concrete pile can be occluded by cutting part of plain concrete pile during hole formation, but premature cutting should be avoided.
(3When the drill is hoisting the first piece of steel casing in place, two inclinometers should be affixed to the outer wall of the casing and the theodolite should be used to compound the perpendiculity of the casing. The allowable deviation of verticality is0.3%; Hydraulic casing should be positive and negative twisting pressure cutting; When taking soil inside the casing, the bottom of the casing should always be below the soil surface, and the distance between the soil surface and the bottom of the casing should be greater than1.0m.
(4) remove the empty soil and sediment in the hole, and tamp the bottom of the hole with a grab bucket; When pouring concrete, the casing should be lifted step by step with the concrete pouring; The casing should be lifted vertically. When the resistance is too large, the casing should be rotated and slowly lifted.
Technical advantages:
(1Mechanical equipment low noise, no vibration, no mud pollution, similar to the dry method of soil, little impact on the surrounding environment.
(2) Due to the protection of steel casing, it can be close to temporary buildings and underground pipes, so it is easy to control settlement and deformation.
(3The full casing can be successfully drilled through saturated aquifers, effectively preventing shifting sand and gouging in the hole, and can be embedded in rock. The construction is safe and fast, which can better control the pile mass and ensure the pile bearing capacity.
(4) The piles for the second construction are cut and interlocked between the two piles in the existing first order. The guard hole of the whole casing ensures the close bite between the piles, forming a good overall continuous structure.
(5Compared with other enclosure structures, the occluding pile enclosure has certain advantages in cost, and it is not necessary to construct the water stop curtain again.
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