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Post-tensioning method up-lift pile used in combination with pile body post-grouting and construction method of up-lift pile

A construction method and technology of uplift piles, which are applied in basic structure engineering, sheet pile walls, buildings, etc., can solve problems such as increasing project cost, and achieve the effect of reducing project cost, facilitating implementation, and maintaining a central position.

Pending Publication Date: 2018-10-12
北京市地质工程有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, in the actual production process, the actual amount of reinforcement that meets the requirements of crack resistance is much larger than the amount of reinforcement that meets the requirements of pullout bearing capacity, thus seriously increasing the project cost

Method used

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  • Post-tensioning method up-lift pile used in combination with pile body post-grouting and construction method of up-lift pile
  • Post-tensioning method up-lift pile used in combination with pile body post-grouting and construction method of up-lift pile
  • Post-tensioning method up-lift pile used in combination with pile body post-grouting and construction method of up-lift pile

Examples

Experimental program
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Embodiment 2

[0061] A construction method of a post-tensioned uplift pile combined with grouting behind the pile, including the following construction steps:

[0062] Step 1: Make the main body 1 of the uplift pile, pre-embed the grouting pipe 3, and complete the grouting of the pile body in the grouting pipe 3;

[0063] Step 2: Sleeve the slurry isolation plug 41 on the prestressed tendon 4;

[0064] Step 3: implanting prestressed tendons 4 along the grouting pipe 3;

[0065] Step 4: chisel the pile head to the design pile top elevation, apply prestress to the prestressed tendon 4 and lock it to the design locking tension value;

[0066] Step 5: Perform waterproof treatment on the pile head of the main body 1 of the uplift pile.

[0067] Such as Figure 5 As shown, in step 1, the main body of the uplift pile 1 is pre-embedded with the grouting pipe 3 during processing, and grouting is injected into the grouting pipe 3 .

[0068] Such as Image 6 As shown, in step 2, the slurry isolat...

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Abstract

The invention discloses a post-tensioning method up-lift pile used in combination with pile body post-grouting and a construction method of the up-lift pile. The up-lift pile comprises an up-lift pilebody, a grouting pipe pre-buried in the length direction of the up-lift pile body and reinforcing ribs; cement slurry columns are poured in the grouting pipe; pre-stress ribs are inserted and connected in the grouting pipe; each pre-stress rib comprises an anchoring segment inserted and connected in the corresponding cement slurry column and a free segment located on the upper side of the corresponding cement slurry column; and the upper end position of the up-lift pile body is provided with locking assemblies for locking the pre-stress ribs. The construction method includes the following construction steps that firstly, the anti-lift pile is made, the grouting pipe is pre-buried, and grouting of the pile body is completed; secondly, the pre-stress ribs are sleeved with slurry isolating plugs; thirdly, the pre-stress ribs are implanted along the grouting pipe; and fourthly, pre-stress is applied to the pres-stress ribs and locking is performed. Pre-stress is provided for the anti-liftpile body, the normal tensile stress of the up-lift pile body is reduced, the number of the reinforcing ribs for use can be lowered for the up-lift pile body with the crack resisting requirement, andthe engineering cost is lowered.

Description

technical field [0001] The invention relates to the field of pile foundation engineering, and more specifically relates to a post-tensioning uplift pile used in combination with post-post grouting and a construction method thereof. Background technique [0002] The main mechanism of the uplift pile is to rely on the friction between the pile body and the soil layer to resist the axial tension. Such as anchor piles, anti-floating piles, etc. [0003] When the uplift pile is formed into a pile, a reinforcement cage is first installed in the pile hole, and then concrete is poured into the reinforcement cage to form the uplift pile. In the process of making the uplift pile, in order to increase the tensile strength, the maximum To make full use of the uplift side resistance of the pile side soil, the grouting pipe is usually pre-embedded when forming the uplift pile, and the friction between the soil and the soil is increased by pouring cement slurry into the grouting pipe, the...

Claims

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Application Information

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IPC IPC(8): E02D5/58E02D5/62E02D5/54
CPCE02D5/54E02D5/58E02D5/62E02D2250/0046
Inventor 任贵生
Owner 北京市地质工程有限责任公司
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