CN104420486B - A kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile - Google Patents

A kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile Download PDF

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Publication number
CN104420486B
CN104420486B CN201310366013.6A CN201310366013A CN104420486B CN 104420486 B CN104420486 B CN 104420486B CN 201310366013 A CN201310366013 A CN 201310366013A CN 104420486 B CN104420486 B CN 104420486B
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Prior art keywords
steel
pipe pile
shallow foundation
pile
diameter
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CN104420486A (en
Inventor
常建华
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Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
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Guiyang Aluminum Magnesium Design and Research Institute Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D37/00Repair of damaged foundations or foundation structures
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00Foundations as substructures
    • E02D27/32Foundations for special purposes
    • E02D27/48Foundations inserted underneath existing buildings or constructions
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/24Prefabricated piles
    • E02D5/28Prefabricated piles made of steel or other metals
    • E02D5/285Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0026Metals
    • E02D2300/0029Steel; Iron

Abstract

The invention discloses a kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile, the method is to substitute existing armored concrete root pile using steel-pipe pile;Specifically construct according to the following steps:1st, steel-pipe pile diameter and quantity are determined according to prospecting and result of calculation, 2nd, use perforation of boring machine on having extended shallow foundation base plate, 3, steel-pipe pile is put into after the boring machine boring in the hole according to the geological state having extended below shallow foundation base plate or using static press piling by the way of steel-pipe pile is pressed directly into underground;Drilling depth or steel-pipe pile compression distance should make steel-pipe pile bottom enter stable bottom rock or always anchor in soil;4th, with C30 fine-stone concrete, steel-pipe pile is connected with having extended shallow foundation base plate.The method of the present invention carries out reinforcing to existing basis and underpins, and its easy construction is time saving and energy saving, saves material, solve very well simultaneously the bottom of foundation there is pile quality during silt soil strata it is difficult to ensure that a difficult problem, its engineering adaptability is preferable.

Description

A kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile
Technical field
The present invention relates to a kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile, belong to architectural engineering Strengthening of foundation technical field.
Background technology
When there is larger sedimentation because foundation bearing capacity is not enough in existing building extension shallow foundation it is necessary to existed building Ground carry out consolidation process.Traditional reinforcement means is usually to adopt the reinforcement measures such as vibroflotation, Sand Pile Method or compaction pile method, To improve foundation bearing capacity.But these methods waste time and energy, costly, simultaneously because to existing building ground Reason, is not easy in construction operate, difficulty of construction is very big, easily ground top existing building is impacted in work progress.
It is that foundation underpinning is carried out using armored concrete radical stake currently used for the more common method of strengthening of foundation.Adopt The minor diameter armored concrete root pile of stake footpath about 8~20cm carries out foundation underpinning, thus extension shallow foundation is underpined as pile foundation Plinth form, the stake end of root pile is partially into stable bottom rock or always anchors in soil, thus by former shallow foundation underpin for Pile foundation, to reach the purpose of strengthening of foundation.But the method has its limitation, if there is silt soil strata in base lower portion, After root pile pore-forming and during casting concrete, collapse hole, shrinkage cavity accident certainly will occur, easily cause the quality thing such as pile body broken pile, undergauge Therefore, and be difficult in constructing to find, cause potential safety hazard.
Content of the invention
It is an object of the invention to, provide a kind of having extended shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile, Underpining and reinforcing to existing building basis can conveniently and efficiently be realized, to overcome when substrate has silt soil strata, adopt The drawbacks of pile quality accident easily occurs with armored concrete root pile.
Technical scheme:
A kind of extending the method that shallow foundation is additionally arranged at the bottom of steel-pipe pile, the method be substituted using steel-pipe pile existing Armored concrete root pile;Specifically construct according to the following steps:
Step 1, according to prospecting and result of calculation determine steel-pipe pile diameter, the wherein a diameter of 70~180mm of steel-pipe pile:Steel pipe 3-5 times for steel-pipe pile diameter d by steel pipe pile spacing of stake quantity is arranged;
Step 2, use perforation of boring machine on having extended shallow foundation base plate, aperture is 200mm;
Steel-pipe pile is put by the geological state that step 3, basis have extended below shallow foundation base plate using after boring machine boring Enter in the hole or by the way of static press piling, steel-pipe pile is pressed directly into underground;Drilling depth or steel-pipe pile compression distance should make steel Anchor in the stable bottom rock of pile tube bottom entrance or always soil;Steel-pipe pile top is less than and has extended shallow foundation base plate plane 100mm;
Step 4, with C30 fine-stone concrete, steel-pipe pile is connected with having extended shallow foundation base plate.
In preceding method, described steel-pipe pile bottom thickness be 8mm about steel plate be fabricated to pile top shape, and and steel pipe Bottom lock welds, and is easy to into stake with the resistance reducing during piling.
In preceding method, it is welded with the thick shrouding of 10mm in the pipe on described steel-pipe pile top, shrouding top surface is away from steel pipe pile pipe Mouth distance is 20 times of steel-pipe pile diameter d, welds one group of a diameter of 4~12mm in the steel-pipe pile above shrouding, and length is 25 times The reinforcing bar of steel-pipe pile diameter d.
In preceding method, described mono- section of the 700mm that extended below shallow foundation base plate is large aperture hole, and aperture is equal to steel pipe Stake diameter d+100mm, together with the hole C30 fine-stone concrete is poured with steel-pipe pile.
The steel pipe pile reinforced structure constituting by preceding method, including having extended shallow foundation, has extended shallow foundation bottom Be provided with one group of steel-pipe pile, steel-pipe pile bottom stretch into the stable bottom rock in underground or always soil in, steel-pipe pile top is through C30 fine-stone concrete It is connected with having extended shallow foundation.
In aforementioned structure, a diameter of 70~180mm of described steel-pipe pile, one group of steel-pipe pile edge has extended shallow foundation base plate Surrounding is uniform, and spacing is 3-5 times of steel-pipe pile diameter d;The tube wall of steel-pipe pile is more than steel pipe away from the distance having extended shallow foundation Stake diameter.
In aforementioned structure, described steel-pipe pile bottom is provided with pile top.
In aforementioned structure, described steel-pipe pile top is less than and has extended shallow foundation base plate plane 100mm.
In aforementioned structure, described steel-pipe pile top is provided with shrouding, and shrouding top surface is 20 times of steel pipes away from steel-pipe pile mouth of pipe distance Stake diameter d, is welded with the reinforcing bar of one group of a diameter of 4~12mm in the steel-pipe pile above shrouding, and reinforcing bar length is that steel-pipe pile is straight 25 times of footpath d;It is provided with C30 fine-stone concrete in steel-pipe pile above shrouding.
In aforementioned structure, the described shallow foundation bottom base plate that extended is provided with carrying concrete, and carrying concrete is to pour with steel-pipe pile Cylinder concrete column together.
Compared with prior art, present invention steel-pipe pile instead of existing armored concrete root pile existing basis entered Row reinforcing underpins, and makes strengthening of foundation underpinning construction technique become relatively simple, reduces difficulty of construction it is ensured that construction quality. Not only easy construction, time saving and energy saving, save material, also solve the bottom of foundation simultaneously well and there is pile body during silt soil strata Quality it is difficult to ensure that a difficult problem, its engineering adaptability is preferable.
Brief description,
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the top view of Fig. 1;
Fig. 3 is the structural representation at steel-pipe pile top.
Being labeled as in accompanying drawing:1- has extended shallow foundation, 2- steel-pipe pile, 3- rock or always soil, 4-C30 fine-stone concrete, 5- Shrouding, 7- carries concrete.
Specific embodiment,
The present invention is described in further detail below in conjunction with the accompanying drawings, but not as any limitation of the invention.
A kind of extending the method that shallow foundation is additionally arranged at the bottom of steel-pipe pile, as depicted in figs. 1 and 2.The method is to adopt Steel-pipe pile substitutes existing armored concrete root pile;Specifically construct according to the following steps:
Step 1, according to prospecting and result of calculation determine steel-pipe pile diameter, the wherein a diameter of 70~180mm of steel-pipe pile:Steel pipe 3-5 times for steel-pipe pile diameter d by steel pipe pile spacing of stake quantity is arranged;
Step 2, use perforation of boring machine on having extended shallow foundation base plate, aperture is 200mm;
Steel-pipe pile is put by the geological state that step 3, basis have extended below shallow foundation base plate using after boring machine boring Enter in the hole or by the way of static press piling, steel-pipe pile is pressed directly into underground;Drilling depth or steel-pipe pile compression distance should make steel Anchor in the stable bottom rock of pile tube bottom entrance or always soil;Steel-pipe pile top is less than and has extended shallow foundation base plate plane 100mm;
Step 4, with C30 fine-stone concrete, steel-pipe pile is connected with having extended shallow foundation base plate.
In preceding method, described steel-pipe pile bottom thickness be 8mm about steel plate be fabricated to pile top shape, and and steel pipe Bottom lock welds, and is easy to into stake with the resistance reducing during piling.It is welded with the thick shrouding of 10mm, envelope in the pipe on steel-pipe pile top Plate top surface is 20 times of steel-pipe pile diameter d away from steel-pipe pile mouth of pipe distance, weld in the steel-pipe pile above shrouding one group a diameter of 4~ 12mm, length is the reinforcing bar of 25 times of steel-pipe pile diameter d.Described mono- section of the 700mm that extended below shallow foundation base plate is large aperture Hole, aperture is equal to steel-pipe pile diameter d+100mm, together with the hole C30 fine-stone concrete is poured with steel-pipe pile.
The steel pipe pile reinforced structure constituting by preceding method, including having extended shallow foundation 1, has extended shallow foundation 1 bottom Portion is provided with one group of steel-pipe pile 2, steel-pipe pile 2 bottom stretch into the stable bottom rock in underground or always soil 3 in, steel-pipe pile 2 top is through C30 Fine-stone concrete 4 is connected with having extended shallow foundation 1.A diameter of 70~180mm of steel-pipe pile 2, one group of steel-pipe pile 2 is shallow along having extended Uniform around basic 1 base plate, spacing is 3-5 times of steel-pipe pile diameter d;The tube wall of steel-pipe pile away from extended shallow foundation 1 away from From more than steel-pipe pile diameter.Steel-pipe pile 2 bottom is provided with pile top.Steel-pipe pile 2 top is less than and has extended shallow foundation 1 base plate plane 100mm.Steel-pipe pile top is provided with shrouding 5(See Fig. 3), shrouding top surface is 20 times of steel-pipe pile diameter d away from steel-pipe pile mouth of pipe distance, It is welded with the reinforcing bar of one group of a diameter of 4~12mm, reinforcing bar length is 25 times of steel-pipe pile diameter d in steel-pipe pile above shrouding; It is provided with C30 fine-stone concrete 4 in steel-pipe pile above shrouding.Extend shallow foundation 1 bottom base plate and be provided with carrying concrete 7, carrying concrete has been Cylinder concrete column together with pouring with steel-pipe pile.
Embodiment,
When being embodied as, as shown in Figure 1, Figure 2 and Figure 3, can carry out as follows:
First, by carrying out to existing basis checking design calculating, determine that can base bearing capacity meet design requirement, such as Extend shallow foundation and can not meet requirement, strengthening of foundation can have been carried out using the inventive method and underpin, by original extension shallow foundation It is changed to pile foundation;
Second, existing foundation bottom each clay distribution situation is determined by the prospecting before construction, including the mechanics of each soil layer Index etc., and judge whether its bottom has the presence of silt soil strata;
3rd, calculated according to the data of first and second step, so that it is determined that the steel pipe that need to set up in existing shallow foundation Stake quantity, diameter, stake are long and enter the length stablizing in supporting course;
4th, existing extension shallow foundation base plate uses perforation of boring machine, the stake holes of foundation bottom can be according to substrate soil nature Shape adopts different pore-forming modes, when such as bottom of foundation soil is for soil properties such as clays, boring machine can be taken to hole, as muck soil Steel-pipe pile then can be directly pressed directly into by layer using the method for static press piling.
When strengthening of foundation being carried out using the inventive method underpining, following detailing requiments should be met:
A). the stake footpath of steel-pipe pile preferably takes between 70~180mm, is so easy for directly selecting shaped steel steel pipe, it is to avoid scene Make;
B). the opening diameter on existing sole plate is 200mm;
C). the steel-pipe pile plane pilespacing for foundation underpinning is between 3d~5d, and d is steel-pipe pile stake footpath;
D). piling bar bottom should using thickness be 8mm about steel plate be fabricated to pile top shape, and with steel pipe bottom weld envelope Close, be easy to into stake with the resistance reducing during piling;
E). piling bar top structure is shown in diagram, and piling bar top should arrange top closing plate, and thickness is 10mm, and in the above steel of shrouding Weld in the range of inside pipe 4 a diameter of 12mm about reinforcing bar, and anchor in sole plate, reinforcing bar stretches in sole plate Length is 25d, and d is bar diameter;
F). in existing foundation bottom about 700mm high scope, should be suitably expanding during boring, its diameter should be than steel-pipe pile stake footpath Every side goes out 100mm greatly, is easy to be locally generated enlarged footing transmission upper load;
G). by the perforate to sole plate for the C30 pea gravel concreten concrete placings and the hole in the range of stake top enlarged footing And guarantee vibration compacting.
Complete existing strengthening of foundation of the present invention to underpin after completing above-mentioned steps and meeting relative configurations Journey.
It can be seen that, reinforcing is carried out to existing basis using the inventive method and underpins, its easy construction, time saving and energy saving, save material Material, solve very well simultaneously the bottom of foundation there is pile quality during silt soil strata it is difficult to ensure that a difficult problem, its engineering adaptability Preferably.

Claims (8)

1. a kind of extended shallow foundation be additionally arranged at the bottom of steel-pipe pile method it is characterised in that:The method is to adopt steel-pipe pile Substitute existing armored concrete root pile;Specifically construct according to the following steps:
Step 1, according to prospecting and result of calculation determine steel-pipe pile diameter, the wherein a diameter of 70~180mm of steel-pipe pile:Steel-pipe pile number 3-5 times for steel-pipe pile diameter d by steel pipe pile spacing of amount is arranged;It is welded with the thick envelope of 10mm in the pipe on described steel-pipe pile top Plate, shrouding top surface is 20 times of steel-pipe pile diameter d away from steel-pipe pile mouth of pipe distance, welds one group of diameter in the steel-pipe pile above shrouding For 4~12mm, length is the reinforcing bar of 25 times of steel-pipe pile diameter d;
Step 2, use perforation of boring machine on having extended shallow foundation base plate, aperture is 200mm;
Steel-pipe pile is put into hole using after boring machine boring by the geological state that step 3, basis have extended below shallow foundation base plate Interior or by the way of static press piling, steel-pipe pile is pressed directly into underground;Drilling depth or steel-pipe pile compression distance should make steel-pipe pile Anchor in the stable bottom rock of bottom entrance or always soil;Steel-pipe pile top is less than and has extended shallow foundation base plate plane 100mm;
Step 4, with C30 fine-stone concrete, steel-pipe pile is connected with having extended shallow foundation base plate.
2. according to claim 1 method it is characterised in that:Described steel-pipe pile bottom thickness be 8mm about steel plate system It is made pile top shape, and closes welding with steel pipe bottom, be easy to into stake with the resistance reducing during piling.
3. according to claim 1 method it is characterised in that:Described extend mono- section of 700mm below shallow foundation base plate and be Large aperture hole, aperture is equal to steel-pipe pile diameter d+100mm, together with the hole C30 fine-stone concrete is poured with steel-pipe pile.
4. a kind of steel pipe pile reinforced structure constituting by claims 1 to 3 any claim methods described, including having extended Shallow foundation(1)It is characterised in that:Extend shallow foundation(1)Bottom is provided with one group of steel-pipe pile(2), described steel-pipe pile top sets There is shrouding(5), shrouding top surface is 20 times of steel-pipe pile diameter d away from steel-pipe pile mouth of pipe distance, welds in the steel-pipe pile above shrouding There is the reinforcing bar of one group of a diameter of 4~12mm, reinforcing bar length is 25 times of steel-pipe pile diameter d;It is provided with steel-pipe pile above shrouding C30 fine-stone concrete(4);Steel-pipe pile(2)The stable bottom rock in underground or always native is stretched in bottom(3)In, steel-pipe pile(2)Top warp C30 fine-stone concrete(4)With extended shallow foundation(1)Connect.
5. according to claim 4 structure it is characterised in that:Described steel-pipe pile(2)A diameter of 70~180mm, one group of steel Pile tube(2)Edge has extended shallow foundation(1)Uniform around base plate, spacing is 3-5 times of steel-pipe pile diameter d;The tube wall of steel-pipe pile Away from having extended shallow foundation(1)Distance be more than steel-pipe pile diameter.
6. according to claim 4 structure it is characterised in that:Described steel-pipe pile(2)Bottom is provided with pile top.
7. according to claim 4 structure it is characterised in that:Described steel-pipe pile(2)Top is less than and has extended shallow foundation(1) Base plate plane 100mm.
8. according to claim 4 structure it is characterised in that:Described extend shallow foundation(1)Bottom base plate is provided with carrying Concrete(7), carry concrete be pour with steel-pipe pile together with cylinder concrete column.
CN201310366013.6A 2013-08-21 2013-08-21 A kind of extending shallow foundation and be additionally arranged at the bottom of method and the structure of steel-pipe pile Active CN104420486B (en)

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CN106869106A (en) * 2015-12-14 2017-06-20 中冶天工集团有限公司 A kind of method for welding the steel pipe pile reinforced ground of side wing type
CN105672347A (en) * 2016-01-25 2016-06-15 济南轨道交通集团有限公司 Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method
CN105971040A (en) * 2016-06-23 2016-09-28 程华清 Dilapidated building reinforcement method
CN109989415B (en) * 2019-05-06 2021-05-28 河南绿建建筑科技有限公司 Construction method of fabricated foundation
CN111501818B (en) * 2020-05-08 2021-10-29 江苏海洋大学 Cement rod foundation for soft soil area and construction method thereof
CN112593584B (en) * 2020-12-14 2022-08-05 赤东建设集团有限公司 Existing building foundation pile extension reinforcing structure and construction method thereof
CN113338365B (en) * 2021-06-25 2022-11-15 中国华能集团清洁能源技术研究院有限公司 Reinforced structure of onshore fan expanded foundation pipe pile and construction method

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