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Enlarged Head Capsule Anchor and Its Construction Method

A construction method and head-enlarging technology, which is applied in the direction of foundation structure engineering, buildings, sheet pile walls, etc., can solve the problems of small pull-out resistance, large investment, and inability to effectively meet the needs of engineering construction, and achieve the effect of increasing the ultimate load

Active Publication Date: 2016-08-24
ANHUI TONGJI CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the anti-floating pile is a conventional practice with mature technology and experience to follow. However, since the material uses steel cage + concrete, the investment is relatively large, and the tensile performance of concrete is poor.
The anti-floating anchor (tension type) usually provides a small pull-out force. For projects with high anti-floating design bearing capacity, the traditional anchor can no longer effectively meet the needs of engineering construction, and the grouting body at the fixed end is prone to tension. Pull cracks, poor anti-corrosion performance

Method used

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  • Enlarged Head Capsule Anchor and Its Construction Method
  • Enlarged Head Capsule Anchor and Its Construction Method
  • Enlarged Head Capsule Anchor and Its Construction Method

Examples

Experimental program
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Effect test

Embodiment example 1

[0037] The present invention relates to an expanded-head capsule anchor rod, which includes a finished rolled threaded steel bar 1, a capsule expansion extruded body 2, and a sleeve 12. The finished rolled threaded steel bar 1 extends into the capsule type expanded extruded body 2, and The bottom of the expansion expansion body 2 is provided with a grouting material bottom cover 3, which is provided with a grout stopper 4 at the entrance of the expansion expansion body 2, and a backing plate 5 is fixed on the upper part of the finished rolled threaded steel bar 1. The threaded steel bar 1 is set with a prestressed nut 6 and the prestressed nut 6 compresses the top surface of the backing plate 5, the top surface of the backing plate 5 is fixed with a conical iron cap 7 with a reserved hole, and the conical iron cap 7 covers the set with a prestressed The finish-rolled threaded steel bar 1 of the stress nut 6, the casing 12 is set on the finished-rolled threaded steel bar 1 and h...

Embodiment example 2

[0041] 1) Drilling and forming holes

[0042]Start the high-pressure mud pump to supply high-pressure water or cement slurry or bentonite mud to the rotary jet drilling rig, and check the jetting situation of the drill bit. When the drill bit sprays stably and the drill pipe rotates smoothly, spin down to drill the hole to the design depth. When the drill reaches the design depth, stop drilling down, but keep the drill pipe rotation and high-pressure water jetting.

[0043] ①Before construction, on-site process test adjustment and determination of appropriate process parameters should be carried out, and the diameter of the expansion head and the pull-out force of the anchor should be inspected. The hole spacing error in the horizontal and vertical directions should not be greater than 100mm; the diameter of the drill bit should not be less than the design drilling diameter of 3mm; the deviation of the drilling angle should not be greater than 2 degrees; the depth of the drill...

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Abstract

The invention discloses an expanded head capsule type anchor rod. The anchor rod comprises a finish rolled threaded reinforcing bar, a capsule type squeezing and expansion body and a bushing, wherein the finish rolled threaded reinforcing bar extends into the capsule type squeezing and expansion body; a grouting material seal bottom is arranged at the bottom in the capsule type squeezing and expansion body; a stop-grouting plug is arranged at an inlet of the capsule type squeezing and expansion body; a backing plate fixedly sleeves the upper part of the finish rolled threaded reinforcing bar; a pre-stressed nut sleeves the finish rolled threaded reinforcing bar; a conical iron hat with a reserved hole is fixedly arranged on the top surface of the backing plate and covers the finish rolled threaded reinforcing bar sleeved by the pre-stressed nut. The invention also discloses a construction method of the expanded head capsule type anchor rod. The method comprises the following steps: drilling and forming a hole; performing high-pressure rotary spray grouting to perform expanding construction; placing the expanded head capsule type anchor rod; grouting cement mortar into a pocket; supplementing the mortar; tensioning and locking. The expanded head capsule type anchor rod and the construction method have the beneficial effect that the conventional anchor rod which is widely used at present can be partially substituted at wider areas and in engineering projects.

Description

technical field [0001] The invention relates to an enlarged head capsule type anchor rod and a construction method thereof. Background technique [0002] With rising land prices and a surge in the number of cars, cities are developing underground space on a massive scale. Underground buildings have reached multiple layers, and the safety of underground engineering is becoming more and more important. Traditional anchors have been widely used in water conservancy and hydropower, industrial and civil construction, transportation, and municipal projects. Because they are tensile anchors, especially when they are used in soil layers, there is a cement protective layer that is easily cracked and the steel bars are corroded and anchored. Small force, difficult quality control and other problems. [0003] Most of the current domestic anti-floating building foundations adopt: 1) anti-floating reinforced concrete pouring piles; 2) anti-floating anchor rods (tension type). Among th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D5/80E02D15/04
CPCE02D5/74E02D15/04
Inventor 吴晓东刘庆昌赵业荣曹生财丁二虎沈刚
Owner ANHUI TONGJI CONSTR GRP
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