CN103104102B - Construction method for underground storey-addition reconstruction - Google Patents

Construction method for underground storey-addition reconstruction Download PDF

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Publication number
CN103104102B
CN103104102B CN201310036926.1A CN201310036926A CN103104102B CN 103104102 B CN103104102 B CN 103104102B CN 201310036926 A CN201310036926 A CN 201310036926A CN 103104102 B CN103104102 B CN 103104102B
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construction
concrete
column
root pile
base plate
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CN103104102A (en
Inventor
于成江
孙宇
崔爱珍
章慧蓉
张斌
陆志军
庞卫涛
黄亚峰
董少峰
李鹏浩
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China Construction Eighth Engineering Division Co Ltd
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China Construction Eighth Engineering Division Co Ltd
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Abstract

The invention discloses a construction method for underground storey-addition reconstruction. The construction method for underground storey-addition reconstruction is used for stretching a base board and a structure column of existing buildings downward and includes the following steps: (1) enabling plural holes to be formed in the base board, (2) constructing a root pile to the holes, (3) constructing plural bonded rebars around the structure column, (4) pouring a concrete bearing platform on the base board, (5) smashing and removing the base board and excavating earthwork on the lower portion of the base board to a designed base, (6) casting a concrete foundation on the basement, and further casting a concrete column to connect with the structure column, and (7) removing the bearing platform and the part of the root pile which is exposed from the concrete foundation, and completing construction. The root pile is utilized as the base board of the existing building and as temporary support for the structure column. In the process of earthwork downward excavation and stability of the existing building is guaranteed. The problem that the structure column stretches downward can be well solved, and the purposes that bottom layer is heightened and underground storey-addition is reconstructed are achieved. The construction method for underground storey-addition reconstruction is wide in promotion prospects.

Description

A kind of construction method for underground storey-addition reconstruction
Technical field
The present invention, about a kind of construction method for underground storey-addition reconstruction, refers in particular to a kind of construction method for underground storey-addition reconstruction utilizing root pile to carry out supporting conversion.
Background technology
City of the world's Experience in Development shows, rational exploitation and utilization urban underground space, is the important channel of Resources for construction economy type, Environment-friendly city, is the Important Action realizing urban sustainable development.Given this, for the exploitation of urban underground space, for seeking a kind of construction method, can to reach existing building pillar to downward-extension, reaching bottom and increasing and the object of basement add-story reconstruction.
Summary of the invention
Because the problems referred to above, the invention provides a kind of construction method for underground storey-addition reconstruction, for by the base plate of existing building and structural column to downward-extension, comprise the following steps:
(1) on described base plate, offer plurality of holes along described structural column one week symmetry, and extend downward in the bottom earthwork of described base plate;
(2) root pile is passed described construction of bottom plates in described hole;
(3) within one week, radially to construct complex root bar planting along described structural column, and the expose main muscle of described bar planting with described root pile is intersected mutually;
(4) on described base plate, build a concrete bearing platform, by described root pile expose main muscle and described bar planting is all anchored in described cushion cap;
(5) after described root pile and described cushion cap all reach design strength, pound except described base plate, and the bottom earthwork of excavating described base plate is to designing substrate;
(6) build a concrete foundation on the substrate, and in described concrete foundation, build a concrete column until be connected with described structural column further;
(7) after described concrete foundation and described concrete column reach design strength, remove the part that described cushion cap and described root pile expose described concrete foundation, complete construction.
Further, in step (2), also step is comprised:
(21) reinforcing cage is put in the hole;
(22) concreting in the hole, forms described root pile.
Further, in step (2), when the retaining wall in described hole can not meet the demands, also comprise step:
(21) steel sleeve is put in the hole;
(22) in described steel sleeve, a reinforcing cage is put into;
(23) concreting in described steel sleeve, along with the increase of concreting height, extracts described steel sleeve successively, forms described root pile.
Further, the pile body diameter of described root pile is not less than 150mm, and stake is long is no more than 30m, and concrete strength of pile is not less than C20, and the main muscle of reinforcing cage is no less than 3.
Further, the main muscle that exposes of described root pile is bent, is beneficial to anchoring.
Further, after step (3), also step is comprised: on described base plate, lay one deck separation layer.
Further, in step (5), stage excavation is carried out to the bottom earthwork of described base plate, often excavate one section, need to reinforce adding strengthening support between root pile described in relative two according to root pile space stiffness.
Further, described strengthening support comprises a supporting rod and two steel pipes, and described two steel pipes are adopted and are nested in respectively on root pile described in relative two by welding after point cutting, and described supporting rod is connected with described two steel-pipe weldings.
Further, described supporting rod is type steel support, and described steel duct adopts high-strength grout perfusion closely knit.
Further, in step (6), the reinforcing bar of described concrete foundation is first installed, and the muscle of being advocated of main for the reinforcing cage of described concrete column muscle and described structural column is adopted be mechanically connected or be welded to connect, build described concrete foundation again, the reinforcing cage of described concrete column is anchored in described concrete foundation, finally builds described concrete column again until be connected with described structural column.
A kind of construction method for underground storey-addition reconstruction of the present invention, utilize the base plate of root pile as existing building and the temporary support of structural column, in the process of downward earth excavation, ensure the stable of existing building, after the base plate of existing building and structural column complete to downward-extension, remove root pile again, namely complete construction.Pass through this method, better can solve the problem of frame construction post to downward-extension, reach bottom and increase and the object of basement add-story reconstruction, at rational exploitation and utilization urban underground space, in the process of Resources for construction economy type, Environment-friendly city, there is wide promotion prospect.
Accompanying drawing explanation
Fig. 1 is the flow chart of construction method for underground storey-addition reconstruction of the present invention.
Fig. 2 is the schematic diagram of existing construction foundation before construction method for underground storey-addition reconstruction of the present invention construction.
Fig. 3 is the schematic diagram of construction method for underground storey-addition reconstruction root pile of the present invention construction.
Fig. 4 is the close-up schematic view of root pile in Fig. 3.
Fig. 5 is the schematic diagram after construction method for underground storey-addition reconstruction cushion cap of the present invention is built.
Fig. 6 is that construction method for underground storey-addition reconstruction of the present invention is pounded except base plate and schematic diagram after earth excavation.
Fig. 7 is the schematic diagram after construction method for underground storey-addition reconstruction concrete foundation of the present invention and concrete column are built.
Fig. 8 is the schematic diagram after construction method for underground storey-addition reconstruction cushion cap of the present invention and root pile are removed.
Detailed description of the invention
Before construction, first the foundation of existing building is identified, under base area, water level conditions takes dewatering measure, according to qualification achievement by having the unit of corresponding qualification and experienced professional and technical personnel's complete design drawing, be responsible for construction by the unit and experienced professional and technical personnel with corresponding qualification.
Coordinate referring to shown in Fig. 1, be the flow chart of a kind of construction method for underground storey-addition reconstruction of the present invention, comprise the following steps:
S1, on base plate 10, symmetry offers plurality of holes.
Coordinate referring to shown in Fig. 2, existing building basis comprises base plate 10 and structural column 11, coordinate referring to shown in Fig. 3, described base plate 10 adopts rig pore-forming symmetry to offer plurality of holes 13 for 11 1 weeks along described structural column, and extends downward in the bottom earthwork 14 of described base plate 10.
S2, constructs a root pile 20 in described hole 13.
Coordinate referring to shown in Fig. 3, when the retaining wall in described hole 13 can meet the demands, this step comprises step:
(21) reinforcing cage is put in the hole;
(22) concreting in the hole, forms described root pile.
Coordinate referring to shown in Fig. 3 and Fig. 4, when the retaining wall in described hole 13 can not meet the demands, this step comprises step:
(21) in described hole 13, a steel sleeve 21 is put into;
(22) in described steel sleeve 21, put into a reinforcing cage 22, and the main muscle 220 that exposes of described reinforcing cage 20 is bent, be beneficial to anchoring;
(23) concreting in described steel sleeve 21, along with the increase of concreting height, extracts steel sleeve 21 successively, forms described root pile 20.
Coordinate referring to shown in Fig. 4, Fig. 5, described root pile 20 comprises pile concrete 23 and reinforcing cage 22, described root pile 20 adopts clear water or native mud retaining wall to construct in the bottom earthwork 14 of described base plate 10, arranges steel sleeve 21 when retaining wall can not meet the demands.The pile body diameter of described root pile 20 is not less than 150mm, and stake is long is no more than 30m, and pile concrete 23 intensity is not less than C20, and the main muscle of reinforcing cage 22 is no less than 3, and reinforcing cage external diameter is less than design stake footpath 40 ~ 60mm.With the contact site of described base plate 10, quarantine measures are taked to the pile concrete 23 of described root pile 20.Further, the vertical bearing capacity of single pile of described root pile 20 is determined by Single pile static load test, and the simultaneously determination of the vertical bearing capacity of single pile of described root pile 20 is taken an examination the restriction of foundation deformation condition and the requirement of strength of pile shaft material of considering existing building.
S3, in a plurality of bar planting of construction in 11 1 weeks of described structural column.
Again coordinate referring to shown in Fig. 3, apart from described base plate 10 end face 100mm place, within 11 1 weeks, radially to construct a plurality of bar planting 12 along described structural column, and the expose main muscle 220 of described bar planting 12 with described root pile 20 is intersected mutually, the requirement of bar planting 12 and bar gauge, model meet relevant criterion and designing requirement.
S4, described base plate 10 builds a concrete bearing platform.
Again coordinate referring to shown in Fig. 5, dry paving one deck separation layer 15 on described base plate 10, this separation layer 15 can adopt malthoid.Then build on described base plate 10 a concrete bearing platform 30(or rectangle lift beam or " ten " word intersect lift beam), described root pile 20 expose main muscle 220 and described bar planting 12 is all anchored in described cushion cap 30.
Wherein, described cushion cap 30 is centered by described structural column 11, by the bar planting 12 of described structural column 11 border with described structural column 11 compact siro spinning technology, described cushion cap 30 exposes main muscle 220 with described root pile 20 compact siro spinning technology by described root pile 20, and described cushion cap 30 is isolated with described base plate 10 by described separation layer 15.
S5, pound except described base plate 10 and the bottom earthwork 14 of excavating described base plate 10 to design substrate.
Coordinate referring to shown in Fig. 6, after described root pile 20 and described cushion cap 30 all reach design strength, pound except described base plate 10, and the bottom earthwork 14 of excavating described base plate 10 is to design substrate 15.
Wherein, in shoveling process, stage excavation is carried out to the bottom earthwork 14 of described base plate 10, often excavate one section, all reinforce adding a strengthening support 40 described in adjacent two between root pile 20.Described strengthening support 40 comprises supporting rod 41 and two steel pipes 42, described supporting rod 41 can be type steel support, described two steel pipes 42 adopt being nested on root pile 20 described in adjacent two respectively by welding after point cutting, the internal diameter of described steel pipe 42 exceedes more than the diameter 50mm of described root pile 20, described supporting rod 41 is welded to connect with described two steel pipes 42, and described steel pipe 42 inside adopts high-strength grout perfusion closely knit.
S6, a concrete foundation is built in described substrate 15, and builds a concrete column further and be connected with described structural column 11.
Coordinate referring to shown in Fig. 7, described substrate 15 is built a concrete foundation 50, and in described concrete foundation 50, builds a concrete column 51 until be connected with described structural column 11 further.In construction, described concrete foundation 50 and described concrete column 51 are constructed according to design drawing, the reinforcing bar of described concrete foundation 50 is first installed, and the main muscle of reinforcing cage of described concrete column 51 and the muscle of being advocated of described structural column 11 are adopted be mechanically connected or be welded to connect, build described concrete foundation 50 again, the reinforcing cage of described concrete column 51 is anchored in described concrete foundation 50, finally builds described concrete column 51 again until be connected with described structural column 11.
S7, removes the part that described cushion cap 30 and root pile 20 expose described concrete foundation 50, completes construction.
Coordinate referring to shown in Fig. 8, after described concrete foundation 50 and described concrete column 51 reach design strength, remove the part that described cushion cap 30 and described root pile 20 expose described concrete foundation 50, complete construction.
The above is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, not departing from the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.

Claims (8)

1. a construction method for underground storey-addition reconstruction, for by the base plate of existing building and structural column to downward-extension, it is characterized in that comprising the following steps:
(1) on described base plate, offer plurality of holes along described structural column one week symmetry, and extend downward in the bottom earthwork of described base plate;
(2) root pile is passed described construction of bottom plates in described hole,
When the retaining wall in described hole can meet the demands, also comprise step: put into a reinforcing cage in the hole, in the hole concreting, form described root pile,
When the retaining wall in described hole can not meet the demands, also comprise step: put into a steel sleeve in the hole, in described steel sleeve, put into a reinforcing cage, concreting in described steel sleeve, along with the increase of concreting height, extract described steel sleeve successively, form described root pile;
(3) within one week, radially to construct complex root bar planting along described structural column, and the expose main muscle of described bar planting with described root pile is intersected mutually;
(4) on described base plate, build a concrete bearing platform, by described root pile expose main muscle and described bar planting is all anchored in described concrete bearing platform;
(5) after described root pile and described concrete bearing platform all reach design strength, pound except described base plate, and the bottom earthwork of excavating described base plate is to designing substrate;
(6) build a concrete foundation on the substrate, and in described concrete foundation, build a concrete column until be connected with described structural column further;
(7) after described concrete foundation and described concrete column reach design strength, remove the part that described cushion cap and described root pile expose described concrete foundation, complete construction.
2. a kind of construction method for underground storey-addition reconstruction as claimed in claim 1, is characterized in that the pile body diameter of described root pile is not less than 150mm, and stake is long is no more than 30m, and concrete strength of pile is not less than C20, and the main muscle of reinforcing cage is no less than 3.
3. a kind of construction method for underground storey-addition reconstruction as claimed in claim 1, is characterized in that bending the main muscle that exposes of described root pile, is beneficial to anchoring.
4. a kind of construction method for underground storey-addition reconstruction as claimed in claim 1, is characterized in that, also comprises step: on described base plate, lay one deck separation layer after step (3).
5. a kind of construction method for underground storey-addition reconstruction as claimed in claim 1, it is characterized in that, in step (5), stage excavation is carried out to the bottom earthwork of described base plate, often excavate one section, need to reinforce adding strengthening support between root pile described in relative two according to root pile space stiffness.
6. a kind of construction method for underground storey-addition reconstruction as claimed in claim 5, it is characterized in that described strengthening support comprises a supporting rod and two steel pipes, described two steel pipes are adopted and are nested in respectively on root pile described in relative two by welding after point cutting, and described supporting rod is connected with described two steel-pipe weldings.
7. a kind of construction method for underground storey-addition reconstruction as claimed in claim 6, is characterized in that described supporting rod is type steel support, and described steel duct adopts high-strength grout perfusion closely knit.
8. a kind of construction method for underground storey-addition reconstruction as claimed in claim 1, it is characterized in that, in step (6), the reinforcing bar of described concrete foundation is first installed, and the muscle of being advocated of main for the reinforcing cage of described concrete column muscle and described structural column is adopted be mechanically connected or be welded to connect, build described concrete foundation again, the reinforcing cage of described concrete column is anchored in described concrete foundation, finally build described concrete column again until be connected with described structural column.
CN201310036926.1A 2013-01-31 2013-01-31 Construction method for underground storey-addition reconstruction Active CN103104102B (en)

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Publication number Priority date Publication date Assignee Title
KR101743758B1 (en) * 2016-07-25 2017-06-05 이엑스티 주식회사 Downward construction method for vertical extension of building using base block
CN109898882A (en) * 2019-03-28 2019-06-18 上海勘察设计研究院(集团)有限公司 A kind of anchor jacked pile combination underpinning structure and its method for existing building underground increasing layer
CN110499928A (en) * 2019-07-25 2019-11-26 广东庆余堂建筑科技有限公司 The construction method and basement of existing building basement raising chamber height

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DE4119259A1 (en) * 1991-06-11 1992-12-17 Kunz Alfred & Co Method for constructing basements under existing building - uses root piles to underpin existing load-bearing walls for construction of concrete ceiling, foundation blocks, support columns
CN1257149A (en) * 1998-12-11 2000-06-21 北京市第七城市建设工程公司 Integral foundation underpinning technology for building added floor
CN2587934Y (en) * 2002-12-25 2003-11-26 国家电力公司华东勘测设计研究院 Composite pile member for composite foundation
CN102182325A (en) * 2011-03-28 2011-09-14 东南大学 Storey adding method for existing building basement with frame structure and independent foundation
CN102444142A (en) * 2011-09-20 2012-05-09 新世纪建设集团有限公司 Pile group column replacement expanded basement and construction method of same
CN102864946A (en) * 2012-10-23 2013-01-09 山东建筑大学 Process for supporting existing buildings through structural steel and horizontal rachel rod member and additionally adding multilayer basement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4119259A1 (en) * 1991-06-11 1992-12-17 Kunz Alfred & Co Method for constructing basements under existing building - uses root piles to underpin existing load-bearing walls for construction of concrete ceiling, foundation blocks, support columns
CN1257149A (en) * 1998-12-11 2000-06-21 北京市第七城市建设工程公司 Integral foundation underpinning technology for building added floor
CN2587934Y (en) * 2002-12-25 2003-11-26 国家电力公司华东勘测设计研究院 Composite pile member for composite foundation
CN102182325A (en) * 2011-03-28 2011-09-14 东南大学 Storey adding method for existing building basement with frame structure and independent foundation
CN102444142A (en) * 2011-09-20 2012-05-09 新世纪建设集团有限公司 Pile group column replacement expanded basement and construction method of same
CN102864946A (en) * 2012-10-23 2013-01-09 山东建筑大学 Process for supporting existing buildings through structural steel and horizontal rachel rod member and additionally adding multilayer basement

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