Construction structure and construction method of anchor pile for large-tonnage test pile

Abstract

The invention discloses a construction structure and a construction method of an anchor pile for a large-tonnage test pile. The construction structure of the anchor pile for the large-tonnage test pile comprises a pile body reinforcement cage placed in a pile hole of the anchor pile under construction, a prestressed structure placed in the pile body reinforcement cage and a positioning frame arranged on the pile hole. The prestressed structure comprises a cylindrical reinforcement cage and a plurality of prestressed steel beams which are evenly arranged on the cylindrical reinforcement cage in a peripheral direction of the cylindrical reinforcement cage, wherein every prestressed steel beam comprises a steel strand through tube I fixed on the cylindrical reinforcement cage and a plurality of steel strands, and the top of the steel strand through tube I is fixed on the positioning frame. The construction method of the anchor pile for the large-tonnage test pile comprises steps of: step 1, prestressed steel beam fixing and matching anchor box installation; step 2, crane placing; step 3, positioning frame installation; step 4, prestressed structure positioning and installation; and step 5, grouting. According to the construction structure and construction method of the anchor pile for the large-tonnage test pile, the structural design is reasonable; the processing, production, installation and arrangement are convenient, the steel strand placing process is greatly simplified, the steel strand positioning method is simple and convenient,, the placing accuracy of the steel strands is easy to be guaranteed, and the anchor pile forming quality can be effectively guaranteed.

Description

technical field [0001] The invention belongs to the technical field of anchor pile construction, and in particular relates to a construction structure and a construction method of anchor piles for large-tonnage test piles. Background technique [0002] In the process of bridge construction, test pile is a very important work, which closely links the design and construction. It is a very important task to use the test pile results to verify the rationality and correctness of the design. Nowadays, static load test pile methods mainly include surcharge method and anchor pile method. Among them, the pile-loading method is mainly suitable for small-tonnage test piles, and the mechanical characteristics of the test piles are tested by applying pile loads on the top of the piles that have been constructed and using the pile-loaded load. However, when carrying out large-tonnage test piles (referring to test piles with an ultimate load-bearing load greater than 2000KN), especially f...

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Problems solved by technology

[0009] First, the pre-embedding of the prestressed steel strand in the anchor pile: due to the complicated pre-embedding method of the prestressed steel strand, an anchoring steel plate is generally designed at the bottom of the prestressed steel strand, but the above-mentioned anchoring steel plate is in the The reinforcement cage of the anchor pile is lowered and the concrete pouring process is easy to cause damage to the structure of the prestressed steel strand in the anchor pile, thereby affecting the subsequent static load test, especially during the pouring construction process due to the influence of the structure damage of the prestressed steel strand Interlayer or broken pile accidents in anchor piles not only affect the test results, but also affect the normal progress of the construction process

[0010] Second, the positioning accuracy of the prestressed steel strand is very high during the connection process between the prestressed steel strand and the reaction cap: since four anchor piles are arranged around a test pile, several groups of anchor piles are designed on each anchor pile. During actual construction, if there is any deviation in the plane positioning and relative direction positioning of any group of steel strands, the prestressed steel strands will not be able to connect and anchor with the reaction force cap, and cannot form a Unified force system, so it is necessary to change the structure of the reaction force cap, resulting in economic and construction period losses

However, in the current construction process of the anchor pile method, effective protection measures are generally not taken for the prestressed steel strands, so the prestressed steel strands cannot meet the straightness requirements during the lowering process, and because the prestressed steel strands are many As a structure with heavy weight and long length, the lowering process is more complicated, and the prestressed steel strands lowered accidentally will produce deviations and affect the overall positioning of the prestressed steel strands; The structure of the prestressed steel strand is relatively complicated, and it is inconvenient to carry out the pouring operation after the lowering is completed, and the prestressed steel strand will have a great impact on the pouring conduit during the pouring process, which may easily cause interlayer or broken pile quality accidents

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