Reinforcing bar of bottom-reamed bored pile and construction method thereof
A technology of bottom-expanding cast-in-situ piles and reinforcement, which is applied in sheet pile walls, foundation structure engineering, construction, etc., can solve the problems of no mature technology for pile bottom reinforcement, improve the shear and bending resistance, and ensure that it can be implemented The effect of increasing the strength and reinforcement density
Inactive Publication Date: 2012-05-30
SHANGHAI URBAN CONSTR GRP
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Problems solved by technology
The key to the method is bottom expansion and reinforcement at the bottom of the pile. The construction method of hole expansion is now mature, but there is still no mature process for reinforcement at the bottom of the pile.
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[0012] see figure 1 , a kind of reinforcing bar that the present invention proposes is suitable for bored bottom expansion grouting pile, and it comprises following parts: big bar cage 1; The small bar cage 2 that is sleeved in big bar bar 1 and height is smaller than big bar bar 1; The sliding buckle 10 on the cage 1; a plurality of connecting ribs 3, the connecting ribs 3 slide through the sliding buckle 10, and the root of the connecting rib 3 is fixed on the small rib cage 2, and the tip is provided with a size larger than The slider 10 is the size of the locking pin 4 . For the construction field, the material of the reinforcement is steel; the root of the connecting reinforcement 3 and the small reinforcement cage 2 are fixed by welding.
[0013] Described large reinforcement cage 1 is cylindrical, and height matches with the height of whole drilling ( figure 1 The height of the large rib cage 1 is not all shown in the middle), and the diameter matches the middle part ...
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The invention provides a reinforcing bar of a bottom-reamed bored pile and a construction method thereof. The reinforcing bar comprises a large bar cage, a small bar cage, a slide fastener and a plurality of connecting bars, wherein the small bar cage is sleeved in the large bar cage, and the height of the small bar cage is smaller than that of the large bar cage; the slide fastener is arranged on the large bar cage; and the connecting bars are slidably penetrated in the slide fastener, the root parts of the connecting bars are fixed on the small bar cage, and the tail part of each connecting bar is provided with a lock pin of which the size is larger than that of the slide fastener. In the invention, when the large bar cage is lifted, the small bar cage downwards slides relative to the large bar cage, the connecting bars are taken back to the large bar cage, and the reinforcing bar can be conveniently moved to the hole bottom; after the reinforcing bar is moved to the hole bottom, the small bar cage goes up relative to the large bar cage, the connecting bars extend out relative to the large bar cage, thus the bottom diameter of the large bar cage is increased to achieve a bottom reaming effect; the small bar cage can also ensure that the reinforcing steel bar density of the pole bottom is increased, and the concrete strength of the pole bottom is also increased; and after concrete is poured, the shearing resistance and the bending resistance of the part of a reamed head of at the pole bottom can be greatly improved so as to greatly improve the vertical bearing capacity of the pile foundation.
Description
technical field [0001] The invention relates to the field of construction, in particular to reinforcement suitable for bored and bottom-enlarging cast-in-place piles and a construction method for the reinforcement. Background technique [0002] At present, the bored piles used in the construction of highway bridges are mainly straight hole piles, whose upper and lower apertures are equal in diameter, and have the functions of supporting, stabilizing and strengthening the foundation. In order to increase the bearing capacity of the pile and increase the stability of the foundation on the basis of the existing straight hole pile, through research and experiments, the engineer proposed the technology of drilling and expanding the bottom of the pile. [0003] The so-called bored and bottom-enlarged cast-in-place piles are to drill the pile holes formed by the equal-diameter drilling method to a predetermined depth, and after replacing the reaming drill bit, open the reaming blad...
Claims
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IPC IPC(8): E02D5/34E02D5/44
Inventor 吴杰张志勇
Owner SHANGHAI URBAN CONSTR GRP