CN101634147A - Method for demolishing ultra high cast-in-place pile head - Google Patents

Method for demolishing ultra high cast-in-place pile head Download PDF

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Publication number
CN101634147A
CN101634147A CN200910063208A CN200910063208A CN101634147A CN 101634147 A CN101634147 A CN 101634147A CN 200910063208 A CN200910063208 A CN 200910063208A CN 200910063208 A CN200910063208 A CN 200910063208A CN 101634147 A CN101634147 A CN 101634147A
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China
Prior art keywords
pile
pile crown
ultra
cast
stake
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CN200910063208A
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CN101634147B (en
Inventor
贾良
徐字平
孙斌
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MCC SHIJIU CONSTRUCTION CO Ltd
China 19th Metallurgical Corp
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MCC SHIJIU CONSTRUCTION CO Ltd
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Abstract

The invention relates to a method for demolishing an ultra high cast-in-place pile head. Operation steps include excavating an ultra cast-in-place pile head after pile driving construction is completed, measuring drawn lines to determine the part to be demolished, binding pile block and fixing a hemp rope, chiselling pile longitudinal reinforcement cover, cutting off longitudinal steel and spiral stirrup, demolishing a pile hole, inserting a combination steel wedge side block in to the hole, inserting a combination steel wedge intermediate block into the middle of the steel wedge side block and driving the intermediate block into the steel wedge side block forcibly and gradually, the ultra high pile head is broken under extrusion force, and the pile head is pulled down by part of the fixed hemp rope. The invention is simple and convenient in procedure, practical in operation and low in labour intensity when being applied, construction speed is fast, construction is safe, cost is low, and the pile top surface of the demolished ultra high pile head is flat. The invention is successfully applied to construction of demolishing ultra high pile head of new 2# blast furnace overhaul modification work foundation of Wuhan Iron and Steel Corporation and 4# coke oven foundation of Nanjing Meishan Iron and Steel Corporation, wherein the pile is cast-in-place reinforced concrete bored pile.

Description

The method of abolishing of ultra high cast-in-place pile pile crown
Technical field
The present invention relates to a kind of method of abolishing of ultra high cast-in-place pile pile crown.
Background technology
Continuous progress along with the building lot treatment technology, the construction of various major diameter mechanical hole building castinplace piles is more and more general, because the characteristic of concrete pile under the bad or soft foundation top-pour water filling of geological conditions, when the cast pile driving construction, tend to occur the superelevation pile crown, the method of abolishing traditional pile crown adopts the artificial pneumatic pick that uses that pile crown is bit by bit cut from top to bottom, this method has following drawback, the one, labour intensity is big, the 2nd, speed of application is slow, the 3rd, the danger coefficient height, the 4th, abolish occur that a stake end face is uneven behind the pile crown easily or pile crown around irregularity.
Summary of the invention
The objective of the invention is at above-mentioned present situation, aim to provide a kind of ater-casting that can fundamentally solve and build the face surfacing, need not problems such as form removal and zone face processing, the method for abolishing of the ultra high cast-in-place pile pile crown that labour intensity is low, high efficiency, construction speed are fast.
The implementation of the object of the invention is, the method for abolishing of ultra high cast-in-place pile pile crown, and concrete job step is as follows:
1) excavation ultra high cast-in-place pile pile crown, measure and abolish the pile crown height:
1. concrete drilling bored concrete pile construction finishes, and pit earthwork digs absolute altitude at the bottom of the bed course, exposes the superelevation pile crown, and measure and make design stake top and abolish the pile crown absolute altitude, and carry out mark,
2. on stake top along selected 3 points in the ground of circumference, angle is 120 ° between point, with 3 be fixed point, with rope segmentation colligation superelevation pile crown,
2) abolish the superelevation pile crown:
1. setting-out is determined more than the design stake top mark height to cut a longitudinal reinforcement topping to the stake longitudinal reinforcement height that anchors in the basis with pneumatic pick, exposes a longitudinal rib and spiral stirrup, circumferentially longitudinal rib and spiral stirrup are cut off along stake cutting the top,
2. select 3 positions on the stake top along the ground of circumference, break anchoring wire to superelevation pile crown internal drilling 5 along the superelevation pile crown with air drill,
3. will make up gad limit piece and insert in the boring, will make up the gad intermediate mass then and insert in the middle of the piece of gad limit, will make up the gad intermediate mass from three directions and squeeze into gradually, pile crown ruptures under the extruding force of gad limit piece,
4. behind the pile crown extrusion fracture, remove a colligation static line, utilize two remaining static lines that pile crown is forgotten about it.
The present invention adopts bottom combination gad extruding broken pile method to abolish the superelevation pile crown, fundamentally improved superelevation pile crown tradition and abolished method, solved effectively that its labour intensity is big, speed of application is slow, danger coefficient height, abolish that pile crown is easy to generate that an end face is uneven or pile crown around problem such as irregularity.Adopt that operation of the present invention is easy, operation is practical, labour intensity is little, speed of application is fast, and construction safety, cost are low, and the stake top surface behind the superelevation pile crown of abolishing is smooth.
Successfully abolished Wuhan Iron ﹠ Steel (Group) Corp. new 2# blast furnace overhaul improvement project basis and the construction of the Nanjing Mei Shan 4# of iron company coke oven base superelevation pile crown with the present invention, stake is the cast-in-situ steel reinforced concrete bored pile.
Description of drawings
Fig. 1 is that stake cuts reinforcement cover and abolishes the boring schematic diagram
Fig. 2 be the a-a of Fig. 1 to view,
Fig. 3 is broken stake combination gad schematic diagram,
Fig. 4 is that the b-b of Fig. 1 is to view.
The specific embodiment
Practicality easy and simple to handle during the present invention considers to abolish, problems such as safety factor height, the superelevation pile crown adopts more than design stake top mark height and cuts a reinforcement cover, cuts off a reinforcing bar, operations such as pile crown are abolished, moved in boring.
With reference to the accompanying drawings, concrete job step of the present invention is described in detail in detail:
1) excavation ultra high cast-in-place pile pile crown, measure and abolish the pile crown height:
1. concrete drilling bored concrete pile construction finishes, and pit earthwork digs absolute altitude at the bottom of the bed course, exposes superelevation pile crown 1, and measure and make design stake top and abolish the pile crown absolute altitude, and carry out mark with red paint,
2. on stake top along selected 3 points in the ground of circumference, angle is 120 ° between point, with 3 be fixed point, with φ 30 ropes made of hemp 2 segmentation colligation superelevation pile crowns, prevent from broken that pile crown is swung during the stake to fall.
2) abolish the superelevation pile crown:
1. setting-out is determined more than the design stake top mark height to cut a longitudinal reinforcement topping 3 to the stake longitudinal reinforcement height that anchors in the basis (cushion cap) with pneumatic pick, exposes a longitudinal rib and spiral stirrup 4, circumferentially longitudinal rib and spiral stirrup 4 are cut off along stake cutting the top,
2. select 3 positions on the stake top along the ground of circumference, break anchoring wire to superelevation pile crown internal drilling 5 along the superelevation pile crown with air drill, hole depth 15~20mm, aperture φ 20,
3. will make up gad limit piece 6 and insert in the boring 5, will make up gad intermediate mass 7 then and insert in the middle of the gad limit piece 6, will make up gad intermediate mass 7 from three directions with sledgehammer and squeeze into gradually, pile crown ruptures under the extruding force of gad limit piece 6,
4. behind the pile crown extrusion fracture, remove the fixedly rope made of hemp of a colligation, utilize remaining two fixedly the rope made of hemp pile crown is forgotten about it.
Wuhan Iron ﹠ Steel (Group) Corp. new 2# blast furnace overhaul improvement project basis and the construction of the Nanjing Mei Shan 4# of iron company coke oven base superelevation pile crown have successfully been abolished with the present invention
Stake is the cast-in-situ steel reinforced concrete bored pile,
The stake footpath is: φ 1000~1200mm,
The high scope of stake toplap is: 0.90~5.30m;
Superelevation is abolished pile crown more than 75.

Claims (3)

1, the method for abolishing of ultra high cast-in-place pile pile crown is characterized in that concrete job step is as follows:
1) excavation ultra high cast-in-place pile pile crown, measure and abolish the pile crown height:
1. concrete drilling bored concrete pile construction finishes, and pit earthwork digs absolute altitude at the bottom of the bed course, exposes the superelevation pile crown, and measure and make design stake top and abolish the pile crown absolute altitude, and carry out mark,
2. on stake top along selected 3 points in the ground of circumference, angle is 120 ° between point, with 3 be fixed point, with rope segmentation colligation superelevation pile crown,
2) abolish the superelevation pile crown:
1. setting-out is determined more than the design stake top mark height to cut a longitudinal reinforcement topping to the stake longitudinal reinforcement height that anchors in the basis with pneumatic pick, exposes a longitudinal rib and spiral stirrup, circumferentially longitudinal rib and spiral stirrup are cut off along stake cutting the top,
2. select 3 positions on the stake top along the ground of circumference, break anchoring wire to superelevation pile crown internal drilling 5 along the superelevation pile crown with air drill,
3. will make up gad limit piece and insert in the boring, will make up the gad intermediate mass then and insert in the middle of the piece of gad limit, will make up the gad intermediate mass from three directions and squeeze into gradually, pile crown ruptures under the extruding force of gad limit piece,
4. behind the pile crown extrusion fracture, remove a colligation static line, utilize two remaining static lines that pile crown is forgotten about it.
2, the method for abolishing of ultra high cast-in-place pile pile crown according to claim 1 is characterized in that with φ 30 ropes made of hemp (2) segmentation colligation superelevation pile crown.
3, the method for abolishing of ultra high cast-in-place pile pile crown according to claim 1 is characterized in that boring (5), hole depth 15~20mm, aperture φ 20.
CN2009100632087A 2009-07-17 2009-07-17 Method for demolishing ultra high cast-in-place pile head Active CN101634147B (en)

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Application Number Priority Date Filing Date Title
CN2009100632087A CN101634147B (en) 2009-07-17 2009-07-17 Method for demolishing ultra high cast-in-place pile head

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CN101634147A true CN101634147A (en) 2010-01-27
CN101634147B CN101634147B (en) 2011-04-20

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102587380A (en) * 2012-02-08 2012-07-18 湖南省第二工程有限公司 Construction method for wholly removing drilling pile head
CN102926380A (en) * 2012-11-20 2013-02-13 中铁十九局集团第三工程有限公司 Bridge cast-in-place pile chiseling-free pile head and construction method thereof
CN102926385A (en) * 2012-11-21 2013-02-13 江苏省交通工程集团有限公司 Method for treating pile-forming mud-clamping defect of large-diameter filling pile of bridge
CN104032739A (en) * 2014-06-11 2014-09-10 田永和 Static efficient breaking pile head
CN105970961A (en) * 2016-05-20 2016-09-28 中国电建集团华东勘测设计研究院有限公司 Safe pile cutting method for foundation pit enclosed with cast-in-place piles
CN108914987A (en) * 2018-07-06 2018-11-30 中国二十冶集团有限公司 Pile crown construction method for high strain monitoring
CN109281317A (en) * 2018-09-13 2019-01-29 江苏中柢建设集团有限公司 A kind of broken pile method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1727580A (en) * 2005-05-31 2006-02-01 刘思谋 File head broken by water injection
CN201268845Y (en) * 2009-03-12 2009-07-08 中铁二十一局集团有限公司 Main reinforcement packaging structure for drill pile top portion

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102587380A (en) * 2012-02-08 2012-07-18 湖南省第二工程有限公司 Construction method for wholly removing drilling pile head
CN102926380A (en) * 2012-11-20 2013-02-13 中铁十九局集团第三工程有限公司 Bridge cast-in-place pile chiseling-free pile head and construction method thereof
CN102926385A (en) * 2012-11-21 2013-02-13 江苏省交通工程集团有限公司 Method for treating pile-forming mud-clamping defect of large-diameter filling pile of bridge
CN104032739A (en) * 2014-06-11 2014-09-10 田永和 Static efficient breaking pile head
CN104032739B (en) * 2014-06-11 2015-09-16 田永和 Static efficiency crushing pile crown
CN105970961A (en) * 2016-05-20 2016-09-28 中国电建集团华东勘测设计研究院有限公司 Safe pile cutting method for foundation pit enclosed with cast-in-place piles
CN105970961B (en) * 2016-05-20 2018-08-07 中国电建集团华东勘测设计研究院有限公司 A kind of bored concrete pile goes along with sb. to guard him deep pit monitor and cuts piling method
CN108914987A (en) * 2018-07-06 2018-11-30 中国二十冶集团有限公司 Pile crown construction method for high strain monitoring
CN109281317A (en) * 2018-09-13 2019-01-29 江苏中柢建设集团有限公司 A kind of broken pile method

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