End embedded type prestressed inclined pile and construction method thereof
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A construction method and prestressing technology, applied in excavation, sheet pile walls, foundation structure engineering, etc., can solve problems such as difficult recovery of loading devices, deformation of foundation pits, and unfavorable and impactful protection of the surrounding environment, achieving the effect of a wide range of applications
Pending Publication Date: 2020-07-03
SHANGHAI GEOTECHN INVESTIGATIONS & DESIGN INST
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However, in the actual implementation process, only when the top of the oblique grouting steel pipe has a certain deformation can it provide a more reliable bearing capacity, which is not conducive to the deformation of the foundation pit and the protection of the surrounding environment
[0003] The publication date is September 4, 2013, and the Chinese patent document with the publication number CN103276739A discloses "a foundation pit support structure with inclined piles and prestressed purlins", which discloses the use of oblique steel support The idea of setting a loading device at the bottom of the basement to actively apply prestress, however, setting the loading device on the bottom plate can only be implemented after the earthwork is completely excavated, and it is difficult to recover the loading device; and because the loading device is set on the bottom plate , the loading device is far away from the control system at the side of the pit, and the connection line between the loading device and the control device at the side of the pit affects the excavation of the earthwork at the side of the pit and the construction of the main underground structure
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Embodiment 1
[0052] see Figure 1-Figure 2 , an end-embedded prestressed oblique pile, comprising an oblique pile, a purlin, an anti-pull device, and a loading device; the oblique pile is driven into the soil before excavation; Flexible connection; the loading device takes the pullout device as the force point, and applies axial prestress to the inclined pile; the pullout device is pre-embedded and fixed in the purlin, and the part where the upper end protrudes from the purlin is installed with the loading device; the pullout device and the The loading device is locked and fixed by a detachable positioning device.
[0053] In this embodiment, the anti-pull device 4 is in the shape of a cylinder, and is sleeved on the outside of the inclined pile 10, and the loading device 1 is arranged inside the anti-pull device 4; Multiple corresponding positioning holes, the two are fastened and positioned by multiple bolts, such as figure 1 and figure 2 shown.
[0054] In this embodiment, the upper ...
Embodiment 2
[0071] see Figure 3-Figure 4 The difference between this embodiment and Embodiment 1 is that the positioning device 5b is different from Embodiment 1. The positioning device adopts a flange, and the loading device 1 is fixedly connected to the upper end of the pullout device 4 through the flange. It is fixed with the anti-pull device, which can also provide a force point for the loading device.
[0072] The construction method in this embodiment, as Figure 13-Figure 18b shown, including the following steps:
[0073] S1. Construction enclosure piles, inclined piles; Figure 13-14 shown;
[0074] S2. After the processing of the connection device (loading port, lateral anti-slip device) is inserted into the inclined pile, the bottom end of the connection device is fixed to the limit point; Figure 15 shown;
[0075] S3. Construction ring beams, such as Figure 16a , 16b shown;
[0076] S4. After the maintenance meets the design requirements, install the loading device; ...
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Abstract
The invention relates to an end embedded type prestressed inclined pile. The inclined pile is driven into soil before excavation; an anti-drawing device is actively connected with the inclined pile inthe axial direction; a loading device uses the anti-drawing device as a focal point to apply axial prestress to the inclined pile; the anti-drawing device is embedded and fixed into a girth purlin, and the loading device is installed on the part of the upper end of the anti-drawing device extending out of the girth purlin; and the anti-drawing device and the loading device are locked and fixed bya detachable positioning device. The end embedded type prestressed inclined pile can apply prestressing force before excavation to give full play to the bearing capacity of the inclined pile quickly;the reverse thrust is provided for the support of the inclined pile through force transfer equipment, the inclined pile deforms ahead of time so as to quickly exert the bearing capacity of the inclined pile, and the deformation of a foundation pit is controlled and the surrounding environment is protected; after the structural maintenance is completed, the anti-drawing device and a prestressing force adding device above the girth purlin can be removed and recovered; and a prestressing force applying device of the inclined pile is located outside a ring beam, the application range is large, and the prestressing force applying device can be extended to the ground to avoid the influence of groundwater due to the falling bottom of the ring beam.
Description
technical field [0001] The invention relates to a diagonal bracing device used in foundation pits, in particular to an end-embedded prestressed inclined pile and a construction method thereof, belonging to the technical field of foundation pit engineering. Background technique [0002] As a temporary support structure for foundation pit engineering, oblique grouted steel pipe braces not only increase the working space in the pit, but also reduce the cost of the support system, which has good application and promotion value. However, in the actual implementation process, only when the top of the oblique grouted steel pipe has a certain deformation can it provide a more reliable bearing capacity, which is not conducive to the deformation of the foundation pit and the protection of the surrounding environment. [0003] The publication date is September 4, 2013, and the Chinese patent document with the publication number CN103276739A discloses "a foundation pit support structure...
Claims
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Application Information
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