CN100443672C - Underpinning method of pile ground underground - Google Patents

Underpinning method of pile ground underground Download PDF

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Publication number
CN100443672C
CN100443672C CNB2006100341514A CN200610034151A CN100443672C CN 100443672 C CN100443672 C CN 100443672C CN B2006100341514 A CNB2006100341514 A CN B2006100341514A CN 200610034151 A CN200610034151 A CN 200610034151A CN 100443672 C CN100443672 C CN 100443672C
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China
Prior art keywords
construction
pilot tunnel
pile foundation
underground
vertical shaft
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CNB2006100341514A
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Chinese (zh)
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CN1818233A (en
Inventor
吕剑英
薛煌
魏玉省
张先锋
肖广智
朱世友
张军
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中铁隧道集团有限公司
中铁隧道勘测设计院有限公司
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Priority to CNB2006100341514A priority Critical patent/CN100443672C/en
Publication of CN1818233A publication Critical patent/CN1818233A/en
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Publication of CN100443672C publication Critical patent/CN100443672C/en

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Abstract

The present invention discloses an underground underpinning method for pile foundations, which comprises: adopting a construction vertical shaft and an underground pilot tunnel group to form an underground underpinning spatial system, carrying out the operation of a pile and beam underpinning system in the underground pilot tunnel group, and realizing the reinforcement and underpinning for the pile foundations of the existing buildings and structures underground. In the method, the construction vertical shaft is used as a channel of construction and material transportation, the pilot tunnel group is composed of a main pilot tunnel and a branch pilot tunnel, the main pilot tunnel is used as a public channel of construction and material transportation, and the branch pilot tunnel is used as an underpinned construction operation channel for each underpinned pile and beam. Compared with the prior art, the method can arrange a construction yard more flexibly, reduce the construction influence on resident living, underground pipelines and traffic.

Description

The underground support and change method of pile foundation

Technical field

The present invention relates to a kind of underground support and change method of pile foundation.

Background technology

At present domestic build, the structure pile underpinning method mainly is to carry out in ground, the building first floor or in the basement.Its principle is to utilize the underpinned pile that newly adds and underpin beam, forms corresponding underpin system, to build, the existing pile foundation plinth of structure carries out Load Transfer.Pile foundation underpinning main construction sequence in ground is as follows: (1) carries out the resettlement of building one deck or basement resident, equipment, needs the enclosure portion road as the construction plant for buildings such as viaduct, overpass bridges; (2) building basement base plate or existing road surface are abolished in the cleaning construction plant, carry out pipeline and move and change, and it is current for the resident to lay occasional passage; (3) excavation foundation trench and carry out supporting and handle, the construction underpinned pile, to build, the structure existing pile foundation carries out interface processing, construction underpins beam, and looks requirement of engineering and push up and cut an operation in advance, finishes the Load Transfer of original base; (4) recover building one deck or basement original state,, also need recover original traffic, finish pile foundation underpinning for viaduct or overpass bridge.

There is following problem in existing ground pile underpinning method in work progress: 1. need to build, the relocating work of structure one deck or basement resident, equipment; 2. pipeline moves and changes work and be difficult to avoid; 3. pollutants such as noise, sewage, waste gas, dust are more, are difficult to control; 4. for buildings such as viaduct, overpass bridges, need carry out traffic and discongest and to construct; 5. can't solve the pile foundation underpinning construction under the circumstance complication condition; 6. in subway engineering, limit the subway line sweep, caused sweep too small; Or the like.

Summary of the invention

The object of the present invention is to provide a kind of underground support and change method of new buildings pile, this method can be arranged the construction plant more neatly, reduces the influence of construction to resident living and traffic.

The underground support and change method of a kind of pile foundation provided by the invention, its main thought is: adopt construction shaft and underground pilot tunnel group to constitute underground underpinning space system, carry out stake in underground pilot tunnel group, corbel changes the system operation.Being implemented in underground pile foundation to existing building reinforces or underpins.In this method, construction shaft is construction and transport of materials passage, and the pilot tunnel group is made up of a main tunnel heading and a pilot tunnel, and main tunnel heading is the public passage of construction and transport of materials, and a pilot tunnel is the underpinning construction operation path of each underpinned pile, beam.

The underground support and change method of a kind of pile foundation provided by the invention comprises following construction sequence:

(1) vertical shaft, pilot tunnel group construction: to existingly build, when structure carry out pile foundation underpinning, according to build, the surrounding enviroment condition of structure, choose reasonable vertical shaft well location and pilot tunnel group's arrangement; The cleaning construction plant, the excavation construction vertical shaft, and the underground pilot tunnel group of the horizontal excavation of silo bottom, the pilot tunnel group is made up of a main tunnel heading and a pilot tunnel, for pile foundation underpinning provides construction space;

(2) the stake corbel changes the system construction: after vertical shaft and pilot tunnel group construction are finished, construction underpin system member in a pilot tunnel, the underpin system member comprises bear responsibility platform and underpin beam of underpinned pile, stake, and the jack and the safety device of bearing responsibility and arranging on the platform by stake, to existingly build, the structure pile foundation pushes up in advance, lock jack oil pressure table and safety device then, finish the Load Transfer of original base;

(3) backfill recovers the construction plant: after underground pile foundation underpinning construction is finished, vertical shaft and pilot tunnel group are carried out backfill, and recover the original state in construction plant.

In the above-mentioned steps (1), pilot tunnel group's excavation is looked geological conditions and can be adopted jumping to dig operation; The parameters of construction technology that relates to comprises: 1 of pile foundation underpinning construction shaft, and described shaft section area form is a rectangle, headroom is 3 * 4~5 * 7 meters in the vertical shaft, or described shaft section area form be circle, 2~7 meters of vertical shaft interior diameters; Headway is 3~5 meters in 1 of the main tunnel heading, main tunnel heading, 2.5~5 meters of width; Pilot tunnel several, headway is 3 meters~7 meters in the pilot tunnel, 2.5~5 meters of width; The main tunnel heading form of fracture is an arch stalk flat shape.

Range of application of the present invention is wider, both can be applicable to existingly build, structure are single or pile foundation underpinning is carried out on many piles basis; Also can be to needs storey-adding reconstruction or pile foundation local defect, former pile foundation bearing capacity can not meet the demands builds, structure carry out the pile foundation reinforcement.Compared with prior art, the present invention has the following advantages:

(1) flexible arrangement vertical shaft and pilot tunnel group reduce or have avoided the resettlement of resident, equipment;

(2) choose reasonable vertical shaft well location reduces or has avoided pipeline to move and changes;

(3) at the underground underpinning construction that carries out, environment pollution is little;

(4) reasonable Arrangement vertical shaft and pilot tunnel group avoid traffic to discongest as far as possible;

When (5) being applied to subway engineering, the subway line that can reduce or avoid the ground pile foundation underpinning to be difficult to carry out to cause is forced to adjust, and has guaranteed science and reasonability that circuit setting and station erect-position are arranged, has reduced the metro operation cost, has improved passenger's comfort level.

The present invention is further illustrated below in conjunction with the drawings and the specific embodiments.

Description of drawings

Fig. 1 is the floor map of job practices of the present invention;

Fig. 2 is the generalized section of job practices of the present invention;

Fig. 3 is the schematic cross-sectional view of construction shaft;

Fig. 4 takes the sectional schematic diagram of a hole and a pilot tunnel as the leading factor.

The specific embodiment

Following examples are used to illustrate the present invention, but protection scope of the present invention is not limited to following examples.

1, project profile

The interval shield construction that adopts in No. five line poplars of Guangzhou Underground dustpan station~five sheep Estate stations~Zhujiang River new city station is worn five sheep Estate overhead building projections under the running tunnel.Five sheep Estate overhead building projections are four story frame structures that building area is about 4600 square metres, and the basis is the manually digging hole filling pile of φ 1200mm, single pile maximum load capacity 900t.This building is located in bustling location, urban district, and ground one deck is a runway, and two-way eight tracks are separated by middle greenbelt, and vehicle flowrate is bigger; There is the about 3000 cubic metres pressure tank of a volume middle greenbelt below, supplies water and cover peripheral numerous high-rise buildings in this pond.Through investigation and actual measurement to building pile basis coordinate and stake end absolute altitude, five sheep Estate overhead building projections have 6 piles basis and invade subway sectional tunnel, need carry out pile foundation underpinning.

2, the underground support and change method of pile foundation is in the performance of this engineering

This engineering adopts 1 interim construction shaft, 1 main tunnel heading and 6 pilot tunnels that 6#, 17#, 25#, 26#, 31#, the 39# pile foundation of five sheep Estate overhead building projections are carried out underground pile foundation underpinning.Interim construction shaft is arranged in the greenbelt in pressure tank west side, headroom 3 * 5m in the vertical shaft, by construction shaft excavation main tunnel heading, and the excavation operation of in main tunnel heading, propping up pilot tunnel, excessive when propping up the pilot tunnel construction in order to prevent surface settlement, adopted to jump and dug operation construction method, adjacent pilot tunnel construction is at interval more than 8m.Employing the bear responsibility platform and underpin underpin system member such as beam of underpinned pile, stake of in pilot tunnel, constructing, realized overhead building projection by the Load Transfer on underpinned pile basis, cut the stake hole by excavation in underpining a pilot tunnel simultaneously, the pile foundation of invading subway sectional tunnel is carried out amputation, guaranteed the normal construction of metro shield running tunnel.Among Fig. 1-4,1. existing building; 2. construction shaft; 3. underpin main tunnel heading; 4. underpin a pilot tunnel; 5. existing building pile foundation (by underpinned pile); 6. underpinned pile; 7. underpin beam; 8. pilot tunnel group.

3, the underground support and change method of pile foundation is at the construction effect of this engineering

Adopt continual monitoring method in this project implementing process, monitored data after engineering construction is finished shows, building is by underpinned pile basis maximum settlement 8mm, minimum sedimentation 1mm, and sedimentation of ground settlement and overhead building projection, pressure tank simultaneously and inclination are all in the scope of regulation and stipulation; This engineering adopts the underground support and change method of pile foundation, has obtained the good technical effect, and is specific as follows:

(1) existing pile foundation underpinning technology needs interim subsurface pressure pond of removing 3000 cubic metres, interrupts the daily water supply of peripheral resident, changes temporarily and moves booster station, and retail shop moves to one deck; And the inventive method need not to carry out the resettlement of resident, equipment, has guaranteed resident's daily life.

(2) existing pile foundation underpinning technology needs runway and road both sides pipeline changed and moves, and changes in the process of moving to take the part runway; And the inventive method has been avoided pipeline to move and has been changed work by the choose reasonable of vertical shaft well location, has ensured carrying out as usual of water supply, power supply and traffic.

(3) pollutants such as the noise that produces in the existing pile foundation underpinning technology construction, sewage, waste gas, dust will influence peripheral resident's normal life to a great extent; And the inventive method drops to minimum level at the underground pile foundation underpinning that carries out with the influence of constructing to surrounding enviroment.

(4) need to take at least 4 runways in the existing pile foundation underpinning technology construction, it is very big that difficulty is discongested in traffic; And the inventive method has avoided traffic to discongest by vertical shaft and construction plant are arranged in the middle greenbelt.

(5) existing pile foundation underpinning technology is difficult to adapt to the surrounding enviroment condition of this engineering complexity, certainly will cause the pressure adjustment of subway interval circuit, interval circuit has to adopt the zig zag small curve radius, causes the significantly raising of subway construction expense and later stage running cost; And the inventive method has been avoided the pressure adjustment of subway line, has adopted rational sweep, has guaranteed the science and the reasonability of circuit type selecting, has also reduced subway later stage operation cost simultaneously, has improved passenger's comfort level.

Claims (4)

1, a kind of underground support and change method of pile foundation, this method comprises following construction sequence:
(1) vertical shaft, pilot tunnel group construction: to existingly build, when structure carry out pile foundation underpinning, according to build, the surrounding enviroment condition of structure, choose reasonable vertical shaft well location and pilot tunnel group's arrangement; The cleaning construction plant, the excavation construction vertical shaft, and the underground pilot tunnel group of the horizontal excavation of silo bottom, the pilot tunnel group is made up of a main tunnel heading and a pilot tunnel, for pile foundation underpinning provides construction space;
(2) the stake corbel changes the system construction: after vertical shaft and pilot tunnel group construction are finished, construction underpin system member in a pilot tunnel, the underpin system member comprises bear responsibility platform and underpin beam of underpinned pile, stake, and the jack and the safety device of bearing responsibility and arranging on the platform by stake, to existingly build, the structure pile foundation pushes up in advance, lock jack oil pressure table and safety device then, finish the Load Transfer of original base;
(3) backfill recovers the construction plant: after underground pile foundation underpinning construction is finished, vertical shaft and pilot tunnel group are carried out backfill, and recover the original state in construction plant.
2, the underground support and change method of pile foundation according to claim 1 is characterized in that in the step (1) that pilot tunnel group's excavation looks geological conditions and adopt to jump and dig operation.
3, the underground support and change method of pile foundation according to claim 1 and 2 is characterized in that the parameters of construction technology that relates in the step (1) comprises:
1 of pile foundation underpinning construction shaft, described shaft section area form is a rectangle, headroom is 3 * 4~5 * 7 meters in the vertical shaft, or described shaft section area form be circle, 2~7 meters of vertical shaft interior diameters;
Headway is 3~5 meters in 1 of the main tunnel heading, main tunnel heading, 2.5~5 meters of width;
Pilot tunnel several, headway is 3 meters~7 meters in the pilot tunnel, 2.5~5 meters of width.
4, the underground support and change method of pile foundation according to claim 3 is characterized in that the main tunnel heading form of fracture is an arch stalk flat shape in the step (1).
CNB2006100341514A 2006-03-08 2006-03-08 Underpinning method of pile ground underground CN100443672C (en)

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CN100443672C true CN100443672C (en) 2008-12-17

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100513708C (en) * 2006-11-24 2009-07-15 浙江理工大学 Method for transversal reinforcement and grouting underpinning of ready construction foundation
CN101294447B (en) * 2007-04-23 2010-04-14 上海市城市建设设计研究院 Buildings pile underpinning method
CN100464035C (en) * 2007-10-17 2009-02-25 中铁十八局集团有限公司 Metro engineering pile foundation underpinning construction method
CN101446089B (en) * 2007-11-27 2010-08-25 贵阳铝镁设计研究院 Thermal power plant boiler pedestal and foundation connection structure and method thereof
CN101967836B (en) * 2010-09-30 2012-02-29 中煤矿山建设集团有限责任公司 Reinforcing method of building foundation by using jacking method
CN102444147A (en) * 2011-11-08 2012-05-09 山西太行建设开发有限公司 Slant correction method for building
CN102733429A (en) * 2012-06-29 2012-10-17 广州市胜特建筑科技开发有限公司 Underpinning method for new tunnel to pass through existing building and underpinning system
CN102817381A (en) * 2012-08-05 2012-12-12 河北省建筑科学研究院 Construction method of rear-embedded pile foundation
CN102864788A (en) * 2012-10-19 2013-01-09 江苏华通工程检测有限公司 Method for underpinning reinforced bridge pile foundation by bear-type static pressure cluster pile
CN103774674B (en) * 2014-01-15 2016-04-13 西安建筑科技大学 A kind of steel pipe underpinned pile and anchor pole deep foundation pit supporting structure and construction method thereof
CN107740446A (en) * 2017-10-16 2018-02-27 广州地铁设计研究院有限公司 Combined construction method of the passive supplement in existing building basis with underpining system in hole

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