Single-pile-casing construction method for static pressure sinking pipe carrier cast-in-place pile

Abstract

The invention discloses a single-pile-casing construction method for a static pressure sinking pipe carrier cast-in-place pile. A static pile driver and a single pile casing can be used for manufacturing the carrier pile; carrier concrete materials are put in at a time, the construction speed is obviously increased, and energy conservation and environment friendliness are achieved; and the pulling resistance of the carrier pile manufactured through the static pile driver and the single pile casing is obviously improved. The method includes the following steps that firstly, a field is cleaned, surveying and setting out are conducted, and the static pile driver is moved to a station; secondly, the steel pile casing provided with a conical valve pile tip is pressed to the designed elevation; thirdly, concrete with the amount needed by a carrier is put into the steel pile casing at a time; fourthly, the steel pile casing is pulled upwards to be exposed out of the ground, and the space formed by upward pulling of the steel pile casing is automatically filled with the put-in carrier concrete ; fifthly, the pile tip is closed, the steel pile casing is pressed downwards, the downward pressing force and the elevation reach preset values, and the carrier concrete is compacted to form an expanded carrier; sixthly, closing is automatically relieved, pile body concrete is poured, or a reinforcement cage is firstly placed, and then concrete is poured; and seventhly, the steel pile casing is pulled out of the ground while vibration is conducted, and the pile is formed.

Description

technical field [0001] The invention relates to the field of building foundation construction, in particular to a pile-forming construction method using a static pressure sinking tube carrier cast-in-place pile using a single steel casing. Background technique [0002] In the foundation engineering of various buildings and structures in our country, piles of various structures are often used by construction units for foundation treatment and reinforcement. At present, carrier piles are a brand-new construction technology, which has changed the traditional concept of foundation treatment. The soil layer with stable and good soil properties is used as the soil layer to be reinforced, and the soil at the pile end is taken as the research object. The bearing capacity of ordinary piles mainly comes from the side friction resistance of piles, while the bearing capacity of carrier piles mainly comes from the carrier. Therefore, Carrier piles are widely used due to their high bearin...

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Problems solved by technology

[0007] From the above, it can be concluded that the existing problems of the pile-forming construction carried out by the static pile driver are: (1) only composite bottom-expanding cast-in-place piles, prefabricated pipe piles and conventional static pressure sinking pipe piles can be constructed. , it is impossible to achieve effective pile construction for carrier piles, especially there is no successful construction of carrier piles with only one steel casing

(2) In the process of making composite bottom-expanding cast-in-place piles, the equipment has the problems of repeated feeding in batches, repeated pressing down in multiple batches, slow construction speed, and seriously affecting the progress of the project

(3) The reinforcement cage lowered by this method cannot enter the inside of the expansion head, and it is difficult to meet the pull-out requirements when used as an uplift pile

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