CN106894424A - A kind of short branch supporting system of basin excavation and its construction technology - Google Patents

A kind of short branch supporting system of basin excavation and its construction technology Download PDF

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Publication number
CN106894424A
CN106894424A CN201710123011.2A CN201710123011A CN106894424A CN 106894424 A CN106894424 A CN 106894424A CN 201710123011 A CN201710123011 A CN 201710123011A CN 106894424 A CN106894424 A CN 106894424A
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CN
China
Prior art keywords
soil
construction
contignation
baffling
bracing members
Prior art date
Application number
CN201710123011.2A
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Chinese (zh)
Inventor
周同和
Original Assignee
周同和
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 周同和 filed Critical 周同和
Priority to CN201710123011.2A priority Critical patent/CN106894424A/en
Publication of CN106894424A publication Critical patent/CN106894424A/en

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Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits

Abstract

A kind of short branch supporting system construction technology of basin excavation, comprises the following steps:1)Construction soil-baffling structure;2)The excavation pit middle part earthwork and foundation ditch edge upper strata cubic metre of earth, in the reserved part soil zone in soil-baffling structure side;3)Construction column and stand column pile;4)Construction foundation pit middle part construction in advance agent structure and reserved soil zone position contignation, contignation uses column as vertical Force transmission partses at local reserved soil zone;5)The contignation that local reserved soil zone position is constructed in advance sets first row bracing members between soil-baffling structure and encloses purlin as counter-force point at it;6)Excavate under local reserved soil zone to second row bracing members absolute altitude;7)Lower floor's main body contignation at the local reserved soil zone of construction, sets second row bracing members and encloses purlin;8)Repeat step 6)、7), it is excavated to substrate.The support system obtained by the construction technology can be applied to without the strict base pit engineering of outer anchor condition, Deformation control requirement.

Description

A kind of short branch supporting system of basin excavation and its construction technology
Technical field
The present invention relates to Base hole supporting technology field, and in particular to a kind of short branch supporting system of basin excavation and its construction Technique.
Background technology
It is general to use inner support support technology in the base pit engineering without outer anchor condition.In the prior art, general interior branch Supporting system is typically constituted by with lower member:
1st, soil-baffling structure, such as campshed, diaphragm wall;
2nd, supporting construction, such as concrete support, steel pipe or type steel support;
3rd, vertical load transfer device, such as shaped steel column, firm lattice column and stand column pile;
4th, purlin is enclosed.
The support system construction process is generally:
1st, construction soil-baffling structure(Campshed, diaphragm wall);
2nd, the first floor cubic metre of earth is excavated, construct stand column pile and column;
3rd, the first row that constructs supports and encloses purlin;
4th, the second layer cubic metre of earth is excavated, construction second row supports and enclose purlin;
5th, the 4th step is repeated, substrate is excavated to.
6th, construction agent structure, support replacement measure should be taken during construction to support absolute altitude, supporting construction is removed, then apply upwards Work agent structure.
General support system has following major defect:
1st, supporting construction is generally foundation ditch both sides to support or the support of foundation ditch middle setting circular ring type, is needed when foundation ditch area is larger A large amount of concrete or steel waste serious as temporary support or column after later stage dismounting.
2nd, agent structure needs to be constructed after foundation ditch is integrally excavated to bottom, and construction period is more long.
3rd, should first carry out support replacement and tear support operation open during main structure construction to support absolute altitude, larger is influenceed on the duration.
The content of the invention
It is an object of the invention to provide a kind of short branch supporting system construction technology of basin excavation, while offer is applied by this The support system that work technique is obtained is another goal of the invention of the invention.The support system can be applied to without outer anchor condition, deformation Control requires strict base pit engineering, and the relatively general support system of support system of the present invention influences smaller to the duration, saves work Journey cost.
To achieve the above object, the present invention uses following technical scheme:
A kind of short branch supporting system construction technology of basin excavation, comprises the following steps:
1)Construction soil-baffling structure;
2)The excavation pit middle part earthwork and foundation ditch edge upper strata cubic metre of earth, in the reserved part soil zone in soil-baffling structure side, form " middle Deep, periphery is shallow " basin shape;And local reserved soil zone carries out temporary supporting to ensure self stability;
3)Construction column and stand column pile;
4)Construction foundation pit middle part construction agent structure and local reserved soil zone position contignation, reserve at soil zone in advance Contignation is using column as vertical Force transmission partses;
5)The contignation that local reserved soil zone position is constructed in advance sets the as counter-force point at it between soil-baffling structure One row's bracing members and enclose purlin;
6)Excavate under local reserved soil zone to second row support absolute altitude;
7)Lower floor's main body contignation at the local reserved soil zone of construction, sets second row bracing members and encloses purlin;
8)Repeat step 6), step 7), it is excavated to substrate;
9)Construct from the bottom to top agent structure basis, exterior wall, post in the range of local reserved soil zone, with middle part constructing structure and side Across contignation realization merges.
Step 1)In, the soil-baffling structure is campshed or diaphragm wall.
Step 9)In, the bracing members pass through and antipriming are set at exterior wall.
Step 5)With 7)In, the bracing members and prestressing apparatus are set between enclosing purlin.
The support system obtained by the described short branch supporting system construction technology of basin excavation, including positioned at foundation ditch middle part Contignation 6 and the soil-baffling structure positioned at foundation pit side-wall, the bottom of contignation 6 sets vertical supporting system;The beam Bracing members are horizontally disposed between hardened structure 6 and soil-baffling structure, bracing members are connected by enclosing purlin with soil-baffling structure.
The vertical supporting system includes column and stand column pile.
Compared with prior art, beneficial effects of the present invention are:
1st, the support system is mainly made up of shorter bracing members and main body contignation 6, and relatively common full supporting construction can Save substantial amounts of concrete or rolled steel dosage;
2nd, foundation ditch mid-section body structure and end bay contignation 6 are constructed in advance, and under end bay reservation conditions, mid-section body structure is applied Work is unaffected, therefore the support system does not influence on the overall duration, relatively general support system, can save a large amount of durations;
3rd, reserve soil zone to be played an important role in support system as a kind of soil-baffling structure, it is ensured that the middle part excavation of foundation pit bottom of to The deformation of support system afterwards meets the requirement of surrounding enviroment;
4th, contignation 6 is higher as counterforce structure reliability, and beam slab is planar structure, and horizontal rigidity is larger, it is possible to provide reliable Support reaction.
Brief description of the drawings
Fig. 1 is construction technology step 1 of the present invention)- step 3)Structural representation;
Fig. 2 is construction technology step 4 of the present invention)- step 5)Structural representation;
Fig. 3 is construction technology step 6 of the present invention)Structural representation;
Fig. 4 is construction technology step 7 of the present invention)Structural representation;
Fig. 5 is construction technology step 8 of the present invention)Structural representation;
Fig. 6 is construction technology step 9 of the present invention)Structural representation.
Specific embodiment
With specific embodiment, the invention will be further described below.
Embodiment 1
Foundation depth 17.0m, foundation ditch surrounding enviroment complicated condition does not possess outer anchor condition, and design is intended using the short branch of basin excavation Supporting system.A kind of short branch supporting system of basin excavation, including contignation 6 in the middle part of foundation ditch and positioned at foundation ditch side The soil-baffling structure 1 of wall, the bottom of the contignation 6 sets vertical supporting system;Between the contignation 6 and soil-baffling structure 1 Horizontally disposed bracing members 10, bracing members 10 are connected by enclosing purlin 7 with soil-baffling structure 1.
Its construction technology, as shown in figures 1 to 6, comprises the following steps:
1)Construction soil-baffling structure 1, the soil-baffling structure 1 is campshed, and the campshed is cast-in-place concrete pile;Retaining piles diameter 1.1m, spacing 1.5m, campshed stake top are located at nature subsurface 2m, and Soil-cement Wall water-stop curtain is set after stake;
2)The excavation pit middle part earthwork and foundation ditch edge upper strata cubic metre of earth, in the reserved part soil zone 2 in soil-baffling structure side, formed " in Between it is deep, periphery is shallow " basin shape;And local reserved soil zone 2 uses soil-nail wall support to ensure self stability, reserves soil height 10.5m, top width 10.5m, reserved soil top mark control high is at 500mm under first row Support Position;
3)Construction column 3 and stand column pile 4.Column 3 uses the firm lattice column of size 440 × 440, and the firm lattice column is four The angle steel of 140 × 14mm is welded by batten plate, and batten plate is the steel plate of 420 × 300 × 10mm of size.The stand column pile is straight The cast-in-place concrete pile of footpath 800mm, interior with constructivity steel reinforcement cage, firm lattice column stretches into 2m in cast-in-place concrete pile.
4)Construction foundation pit middle part construction agent structure 5 and part reserve the position contignation 6 of soil zone 2 in advance, in advance 2 contignation 6 at soil zone is stayed to use column 3 as vertical Force transmission partses;Contignation construction should meet Design of Main Structure will Ask;
5)The contignation 6 that the local reserved position of soil zone 2 is constructed in advance is set at it as counter-force point between soil-baffling structure First row bracing members 10 and enclose purlin 7, the bracing members 10 and prestressing apparatus are set between enclosing purlin 7.The bracing members 10 are H profile steel Support, model H150 × 150 × 7 × 10, bracing members 10 anchor 500mm in contignation 6;The purlin 7 that encloses is for reinforced concrete Native rectangular beam structures, 600 × 500mm of size;The prestressing apparatus are prefabricated movable end, can apply in advance should by jack Power, then removes jack after locking;
6)Under local reserved soil zone 2 to the absolute altitude of second row bracing members 10 of excavation at 500mm;
7)Lower floor's main body contignation at the local reserved soil zone 2 of construction, sets second row bracing members 10 and encloses purlin 7, the steel branch Support 10 and prestressing apparatus are set between enclosing purlin 7;
8)Repeat step 6), step 7), it is excavated to substrate;Should in time to exposure soil body gunite concrete face after every layer of earthwork of excavation Layer, surface thickness 60mm is interior with expanded metal lath;
9)Construct from the bottom to top agent structure basis, exterior wall 8, post in the range of reserved soil zone 2, with middle part constructing structure and end bay Contignation is realized merging, and the bracing members 10 pass through and antipriming 9 is set at exterior wall 8, and antipriming 9 is seal plate, sealing Plate is the width 100mm that setting at the gap of concrete structure formation is penetrated in steel construction, the steel plate of thickness 10mm, by increasing The percolation path of water reaches sealing purpose.
Calculate through this project development side, this project significantly reduces work while construction quality and engineering safety is ensured Cheng Chengben, economic benefit is about 2,240,000 yuan.

Claims (6)

1. the short branch supporting system construction technology of a kind of basin excavation, it is characterised in that comprise the following steps:
1)Construction soil-baffling structure;
2)The excavation pit middle part earthwork and foundation ditch edge upper strata cubic metre of earth, in the reserved part soil zone in soil-baffling structure side, form " middle Deep, periphery is shallow " basin shape;And local reserved soil zone carries out temporary supporting to ensure self stability;
3)Construction column and stand column pile;
4)Construction foundation pit middle part construction in advance agent structure and reserved soil zone position contignation, at local reserved soil zone Contignation is using column as vertical Force transmission partses;
5)The contignation that local reserved soil zone position is constructed in advance sets the as counter-force point at it between soil-baffling structure One row's bracing members and enclose purlin;
6)Excavate under local reserved soil zone to second row bracing members absolute altitude;
7)Lower floor's main body contignation at the local reserved soil zone of construction, sets second row bracing members and encloses purlin;
8)Repeat step 6), step 7), it is excavated to substrate;
9)Construct from the bottom to top agent structure basis, exterior wall, post in the range of local reserved soil zone, with middle part constructing structure and side Across contignation realization merges.
2. the short branch supporting system construction technology of basin excavation as claimed in claim 1, it is characterised in that step 1)In, institute Soil-baffling structure is stated for campshed or diaphragm wall.
3. the short branch supporting system construction technology of basin excavation as claimed in claim 1, it is characterised in that step 9)In, steel Support and antipriming is set through at exterior wall.
4. the short branch supporting system construction technology of basin excavation as claimed in claim 1, it is characterised in that step 5)With 7) In, the bracing members and prestressing apparatus are set between enclosing purlin.
5. the support system for being obtained by any described short branch supporting system construction technologies of basin excavation of claim 1-4, its It is characterised by, including the contignation 6 in the middle part of foundation ditch and the soil-baffling structure positioned at foundation pit side-wall, the bottom of contignation 6 Portion sets vertical supporting system;Between the contignation 6 and soil-baffling structure be horizontally disposed with bracing members, bracing members by enclose purlin with Soil-baffling structure is connected.
6. support system as claimed in claim 5, it is characterised in that the vertical supporting system includes column and stand column pile.
CN201710123011.2A 2017-03-03 2017-03-03 A kind of short branch supporting system of basin excavation and its construction technology CN106894424A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107700493A (en) * 2017-07-14 2018-02-16 腾达建设集团股份有限公司 Basin earthwork excavation method in the small yardstick block of weak soil subway foundation pit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1391013A (en) * 2002-07-25 2003-01-15 上海隧道工程股份有限公司 Technology building up diagonal space brace by reverse masonry method
CN101294390A (en) * 2007-04-27 2008-10-29 上海市第五建筑有限公司 Support system and construction method for smoothening-digging partial center island foundation pit
CN103103988A (en) * 2013-01-21 2013-05-15 安徽省城建设计研究院 Foundation ditch construction method of horizontal bracing structure of central island floor slaps
CN104947682A (en) * 2015-05-06 2015-09-30 中国地质大学(武汉) Foundation pit support construction method and device thereof
CN205776249U (en) * 2016-05-27 2016-12-07 中国建筑西南勘察设计研究院有限公司 A kind of combined inner supporting structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1391013A (en) * 2002-07-25 2003-01-15 上海隧道工程股份有限公司 Technology building up diagonal space brace by reverse masonry method
CN101294390A (en) * 2007-04-27 2008-10-29 上海市第五建筑有限公司 Support system and construction method for smoothening-digging partial center island foundation pit
CN103103988A (en) * 2013-01-21 2013-05-15 安徽省城建设计研究院 Foundation ditch construction method of horizontal bracing structure of central island floor slaps
CN104947682A (en) * 2015-05-06 2015-09-30 中国地质大学(武汉) Foundation pit support construction method and device thereof
CN205776249U (en) * 2016-05-27 2016-12-07 中国建筑西南勘察设计研究院有限公司 A kind of combined inner supporting structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107700493A (en) * 2017-07-14 2018-02-16 腾达建设集团股份有限公司 Basin earthwork excavation method in the small yardstick block of weak soil subway foundation pit
CN107700493B (en) * 2017-07-14 2019-08-16 腾达建设集团股份有限公司 Basin earthwork excavation method in the small scale block of weak soil subway foundation pit

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Application publication date: 20170627