Expanded head capsule type anchor rod and construction method thereof

A construction method and head-enlarging technology, which is applied in foundation structure engineering, construction, sheet pile walls, etc., can solve the problems of small pull-out resistance, large investment, poor anti-corrosion performance, etc., and achieve the effect of increasing the ultimate load

Active Publication Date: 2015-05-06
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) usual

Method used

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  • Expanded head capsule type anchor rod and construction method thereof
  • Expanded head capsule type anchor rod and construction method thereof
  • Expanded head capsule type anchor rod and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0037] The present invention is a capsule-type anchor rod with an enlarged head, which includes a finished-rolled threaded steel bar 1, a capsule-type expansion extruded body 2, a sleeve 12, and the finished-rolled threaded steel bar 1 extends into the capsule-type expansion extruded body 2, and is in the capsule The bottom of the type expansion extruded body 2 is provided with a grouting bottom cover 3, which is provided with a grouting plug 4 at the entrance of the bladder type expansion extruded body 2, and a backing plate 5 is fitted and fixed on the upper part of the finish-rolled rebar 1. The threaded steel bar 1 is covered with a pre-stressed nut 6 and the pre-stressed nut 6 is pressed against the top surface of the backing plate 5. The top surface of the backing plate 5 is fixed with a tapered iron cap 7 with a reserved hole and the tapered iron cap 7 covers the cover The finish rolled rebar 1 of the stress nut 6 and the sleeve 12 are sleeved on the finish rolled rebar 1...

Embodiment example 2

[0041] 1) Drilling and hole formation

[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 jet is stable and the drill pipe rotates smoothly, the drill is rotated down to the design depth. When the drill reaches the design depth, the drill stop is stopped, but the drill pipe is rotated and the high pressure water jet is maintained.

[0043] ①Before construction, it is necessary to carry out on-site process test adjustments and determine appropriate process parameters to check the diameter of the enlarged head and the pull-out resistance of the anchor rod. The hole pitch error in the horizontal and vertical directions should not be greater than 100mm; the drill bit diameter should not be less than the design drilling diameter 3mm; the deviation of the drilling angle should not be greater than 2 degrees; the drilling depth should no...

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PUM

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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] As land prices continue to rise and the number of cars soars, cities are developing underground spaces on a large scale. Underground buildings have reached multiple floors, and the safety of underground engineering is becoming more and more important. Traditional anchor rods have been widely used in water conservancy and hydropower, industrial and civil construction, transportation and municipal engineering. Because they are tensile anchor rods, especially when applied in soil, there is a cement protective layer that is easy to crack after being stressed. The steel bars are corroded and anchored. Problems such as low force and difficult quality control. [0003] At present, most of the domestic anti-floating foundations of buildings are: 1) anti-floating reinforced concrete cast-in-place piles; 2) anti-floating anchors (tension ...

Claims

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Application Information

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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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