CN109537418A - It crosses and wears construction of the highway building method for supporting - Google Patents

It crosses and wears construction of the highway building method for supporting Download PDF

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Publication number
CN109537418A
CN109537418A CN201811500464.3A CN201811500464A CN109537418A CN 109537418 A CN109537418 A CN 109537418A CN 201811500464 A CN201811500464 A CN 201811500464A CN 109537418 A CN109537418 A CN 109537418A
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CN
China
Prior art keywords
highway
support bar
laid
building
soil
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Granted
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CN201811500464.3A
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Chinese (zh)
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CN109537418B (en
Inventor
鄂宇
程淑艳
胡守春
皮阳阳
陈爽
陈文杰
陈洪伟
任碧清
牛利民
刘刚
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Zhongfen Construction Co ltd
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Individual
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Priority to CN201811500464.3A priority Critical patent/CN109537418B/en
Publication of CN109537418A publication Critical patent/CN109537418A/en
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Publication of CN109537418B publication Critical patent/CN109537418B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C21/00Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01CCONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00Foundations for pavings
    • E01C3/04Foundations produced by soil stabilisation
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • E02D1/02Investigation of foundation soil in situ before construction work
    • E02D1/022Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/08Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil

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  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Architecture (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Paleontology (AREA)
  • Analytical Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Road Paving Structures (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)

Abstract

The invention discloses a kind of mistakes to wear construction of the highway building method for supporting, comprising steps of S1, taking the soil sample of highway department and adjacent buildings to be laid side respectively;The soil sample that S2, chemical examination obtain, and obtained data are inputted into preset deep learning model;S3, basis are determined the length of first support bar and the length and tilt angle of second support bar by the data that deep learning model obtains;S4, first support bar is vertically squeezed into the side of both sides of highway to be laid and adjacent building;S5, second support bar is squeezed into soil by the top side inclination of first support bar;S6, dell is dug between the second support bar of roadside to be laid and the second support bar of building side, multi-layer concrete is poured by the bottom of dell, and backfill the soil dug out and compacting between each layer concrete;S7, it is laid with highway to be laid.Which reduce crossing to wear influence of the construction of the highway to surrounding building, the safety of later period building application ensure that.

Description

It crosses and wears construction of the highway building method for supporting
Technical field
The present invention relates to construction of the highway construction technique fields more particularly to a kind of mistake to wear construction of the highway building support side Method.
Background technique
As the current city density of population gradually increases, built increasingly in the house of urban inner and commercial center More, many building capital construction are at the edge in city, and in order to improve the convenience that people stay in such building, developer Generally require to carry out exploitation and perfect to the highway on building periphery again, and after building has been built up, to around it again into The construction of row highway, since highway construction needs the base deep-cut by road to start successively to construct, during deep-cutting, building Soil near object is scooped away or is stirred, it is easy to the loosening of soil texture and the translation of soil layer is caused, so that building Object gradually run-off the straight or sagging is built, causes security risk for the application in later period.
Equally, with the gradually improvement of rural area looks, road also starts gradually to create in rural area, attached in highway for building Close house is also likely to impact existing house during highway construction, thus how to wear construction of the highway excessively Influence of the middle reduction to the building of both sides of highway becomes most important, but there is presently no for the effective and simple of this respect Single measure.
Summary of the invention
It is an object of the invention to solve at least the above problems, and provide the advantages of at least will be described later.
It is a still further object of the present invention to provide a kind of mistakes to wear construction of the highway building method for supporting, reduces Guo Chuan highway The influence constructed to surrounding building ensure that the safety of later period building application.
To achieve the above object with some other purposes, the present invention adopts the following technical scheme:
A kind of mistake wears construction of the highway building method for supporting, comprising the following steps:
S1, the soil sample for taking highway department to be laid and the both sides of highway adjacent buildings to be laid side respectively;
The soil sample that S2, chemical examination obtain, and obtained data are inputted into preset deep learning model;Wherein, described Deep learning model is trained to the data of the influence of surrounding building in excavation or disturbance by the soil of various soil parameters It arrives;
S3, basis are determined the length of first support bar and the length of second support bar by the data that deep learning model obtains Degree and tilt angle;
S4, the first support bar of corresponding length is respectively perpendicular according to the length of the obtained first support bar of S3 squeeze into it is described In the side of both sides of highway to be laid and the building adjacent with the both sides of highway to be laid;
S5, the inclination angle for obtaining the second support bar of corresponding length with S3 according to the length of the obtained second support bar of S3 Degree is squeezed into soil by the top side of the first support bar, and makes the bottom end of the second support bar to described to be laid It is tilted between highway and the building adjacent with the highway to be laid;
S6, digging depth is not small between the second support bar of the roadside to be laid and the second support bar of building side In the dell of the length of the first support bar, multi-layer concrete is poured by the bottom of the dell, and in each layer coagulation The soil dug out is backfilled between soil, and is compacted;
S7, it is laid with highway to be laid.
Preferably, the mistake is worn in construction of the highway building method for supporting, highway department to be laid described in S1 and The soil sample of the both sides of highway adjacent buildings to be laid side respectively takes more parts, and the soil sample from ground start to Under taken once every 30-50cm, the depth selection of the soil sample is identical as base's depth of the highway to be laid.
Preferably, the mistake is worn in construction of the highway building method for supporting, and the training of the deep learning model is also Depth with the base of the height of surrounding building and highway to be laid away from ground is related.
Preferably, the mistake is worn in construction of the highway building method for supporting, positioned at the both sides of highway to be laid The length of first support bar and the length of second support bar and tilt angle, and it is adjacent positioned at the both sides of highway to be laid The length of the first support bar of the side of building and the length of second support bar and tilt angle pass through the deep learning mould Type respectively obtains.
Preferably, the mistake is worn in construction of the highway building method for supporting, the first support bar and the second support One end of bar is respectively set to tip, and the first support bar and second support bar are squeezed into soil by tip;Described first The non-tip of support rod and second support bar welds together.
Preferably, the mistake is worn in construction of the highway building method for supporting, the first support bar and the second support The distance in ground is protruded into not less than 30cm in the non-tip of bar.
Preferably, the mistake is worn in construction of the highway building method for supporting, positioned at the ipsilateral first support bar Non- tip linked together by reinforcing bar.
Preferably, the mistake is worn in construction of the highway building method for supporting, described in ipsilateral adjacent two piece Spacing between first support bar is at a distance between the building adjacent with the highway to be laid of the side of highway to be laid Increase and reduces.
Preferably, the mistake is worn in construction of the highway building method for supporting, the soil in S6 between each layer concrete Evenly spaced in earth to be laid with third support rod, the third support rod is transversely arranged in the soil, and the third The both ends of support rod are fixedly connected with the side wall of the second support bar respectively.
The present invention is include at least the following beneficial effects:
Mistake of the invention is worn in construction of the highway building method for supporting, first to cross wear soil at construction of the highway and its The soil of surrounding building side is sampled and chemically examines, and is used to support building by being calculated for preset deep learning model The length and tilt angle of the support rod of Wu Heguochuan highway are then supporting first support bar and second according to calculated result Bar is constructed, by the supporting structure for the right angle trigonometry form that first support bar and second support bar form, to building side And the soil of roadside to be laid plays support and restriction effect, to subtract when highway construction carries out foundation pit again and digs The disturbance to building side soil is lacked, thus building inclination or sagging risk caused by reducing because of highway construction.
It, will be between building and highway to be laid by after the soil to building side and roadside to be laid is fixed Soil dig out after, layer-by-layer concrete perfusion layer, so that concrete layer is to having further functioned as support between building and highway Effect so that no matter building it is subsequent reconstruction or dismounting or re-laying for highway do not interfere with each other, to building with And highway plays supporting role.
Further advantage, target and feature of the invention will be partially reflected by the following instructions, and part will also be by this The research and practice of invention and be understood by the person skilled in the art.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that mistake provided by the invention wears construction of the highway building method for supporting;
Fig. 2 is the top cross-sectional view of soil provided by the invention and third support rod.
Specific embodiment
It elaborates with reference to the accompanying drawing to the present invention, to enable those of ordinary skill in the art refering to energy after this specification It is enough to implement accordingly.
As shown in Figure 1, a kind of mistake wears construction of the highway building method for supporting, comprising the following steps:
S1, it is taken at highway 1 to be laid respectively and the soil-like of 1 two sides adjacent buildings of highway to be laid, 2 side This.
The soil sample that S2, chemical examination obtain, and obtained data are inputted into preset deep learning model;Wherein, described Deep learning model is trained to the data of the influence of surrounding building in excavation or disturbance by the soil of various soil parameters It arrives.
S3, according to the length and second support bar 4 for determining first support bar 3 by the data that deep learning model obtains Length and tilt angle.
S4, the first support bar 3 obtained according to S3 length the first support bar 3 of corresponding length be respectively perpendicular squeeze into institute It states in 1 two sides of highway to be laid and the side of the building 2 adjacent with 1 two sides of highway to be laid.
The length inclination that obtains the second support bar 4 of corresponding length with S3 of S5, the second support bar 4 obtained according to S3 Angle is squeezed into soil by the top side of the first support bar 3, and make the bottom end of the second support bar 4 to it is described to It is laid between highway 1 and the building 2 adjacent with the highway 1 to be laid and tilts.
S6, depth is dug between the second support bar 4 of 1 side of second support bar 4 and building of 1 side of highway to be laid Not less than the dell of the length of the first support bar, multi-layer concrete 5 is poured by the bottom of the dell, and in each layer The soil 6 dug out is backfilled between concrete 5, and is compacted.
S7, it is laid with highway 1 to be laid.
In the above scheme, the soil for wearing soil and its surrounding building side at construction of the highway excessively is taken first Sample is simultaneously chemically examined, and is used to support the length of the support rod of building and Guo Chuan highway by being calculated for preset deep learning model Degree and tilt angle, are then constructing to first support bar and second support bar according to calculated result, pass through the first support The supporting structure of the right angle trigonometry form of bar and second support bar composition plays the soil of building side and roadside to be laid Support and restriction effect have been arrived, thus reduce the disturbance to building side soil when highway construction carries out foundation pit again and digs, Building inclination or sagging risk caused by reduce because of highway construction.By the setting of deep learning model, so that The parameters such as the length of first support bar and second support bar are targetedly arranged according to the actual conditions of highway department to be laid, Waste of material caused by the use of too long first support bar and second support bar is avoided, also ensures first support bar and The use of two support rods can play effective support to soil, guarantee the safety of building and the construction quality of highway.
It, will be between building and highway to be laid by after the soil to building side and roadside to be laid is fixed Soil dig out after, layer-by-layer concrete perfusion layer, so that concrete layer is to having further functioned as support between building and highway Effect so that no matter building it is subsequent reconstruction or dismounting or re-laying for highway do not interfere with each other, to building with And highway plays supporting role.
By make the bottom end of second support bar to highway to be laid and the building adjacent with the highway to be laid it Between tilt so that first support bar and second support bar composition right-angle side are fitted in the right angle of building and roadside to be laid Shape support construction so that building after soil disturbs in its vicinity to pressure caused by lower by first support bar and second Strut carries out sharing support, to effectively reduce building inclination or sagging risk.
In one preferred embodiment, at highway 1 to be laid described in S1 and 1 two sides adjacent buildings of the highway to be laid The soil sample of 2 sides respectively takes more parts, and the soil sample takes once every 30-50cm downwards by ground, the soil The depth selection of earth sample is identical as base's depth of the highway 1 to be laid.
In the above scheme, more parts are taken by more soil samples, and successively downsampled, so that more to soil constitution Solution guarantees the quality of construction consequently facilitating deep learning model obtains more accurate data, and the construction of highway to be laid is by base Layer starts to be laid with upwards, thus the soil below base is not affected by influences, thus soil sample depth selection and laying highway Base's depth is identical, can guarantee the accuracy for the data that sampled data is complete, ensure that.
In one preferred embodiment, the training of the deep learning model also with the height of surrounding building 2 and to be laid Depth of the base of highway 1 away from ground is related.
In the above scheme, building needs the power of ground supports bigger with the increase of height, thus run-off the straight or under Sunken risk is higher, and the base's depth for being laid with highway is deeper, bigger to the disturbance of surrounding soil, i.e., easier to surrounding building Impact, thus by setting deep learning model formation incessantly the soil with various soil parameters in excavation or disturbance The data training of influence to surrounding building obtains, also the depth with the height of surrounding building and the base of highway to be laid It is related, so that the data surface of obtained deep learning model covering is wider, to be directed to the construction of various environment Zhong Guochuan highways Obtained data are more accurate.
In one preferred embodiment, positioned at the length and second support bar of the first support bar 3 of 1 two sides of highway to be laid 4 length and tilt angle, and the first support bar 3 positioned at the side of the adjacent building 2 in 1 two sides of highway to be laid Length and the length and tilt angle of second support bar 4 respectively obtained by the deep learning model.
In the above scheme, positioned at the parameter of the first and second support rods of roadside to be laid and positioned at building side The parameter of first and second support rods is different, can adapt to the height of different buildings and the width of highway and depth.
In one preferred embodiment, one end of the first support bar 3 and second support bar 4 is respectively set to tip, described First support bar 3 and second support bar 4 are squeezed into soil by tip;The non-point of the first support bar 3 and second support bar 4 End welds together.
In the above scheme, the tip of first support bar and second support bar is squeezed into soil, so that construction is more laborsaving Efficiently, the non-tip of first support bar and second support bar welds together, so that first support bar and second support bar composition Firm right angle trigonometry form support construction reduced to be supported to soil and wears road paving to surrounding building It influences.
In one preferred embodiment, the distance in ground is protruded into not in the non-tip of the first support bar 3 and second support bar 4 Less than 30cm.
In the above scheme, the distance in ground is protruded into not by the non-tip of setting first support bar and second support bar Less than 30cm, so that first support bar and second support bar sufficiently locate below ground level, ground can be re-layed on upper layer, to protect Beauty has been demonstrate,proved, and has avoided first support bar and the long-term exposed influence for supporting stability to it of second support bar.
In one preferred embodiment, linked together positioned at the non-tip of the ipsilateral first support bar 3 by reinforcing bar 7.
In the above scheme, by the way that the non-tip for being located at ipsilateral first support bar is linked together by reinforcing bar, make First support bar has also obtained further fixing and supporting along highway extending direction, to improve first support bar, the Supporting role of two support rods to soil.
In one preferred embodiment, the spacing between the ipsilateral adjacent two piece first support bar 3 is with public affairs to be laid Increase at a distance between the building 2 adjacent with the highway 1 to be laid of the side on road 1 and reduce.
In the above scheme, by the spacing that is arranged between adjacent first support bar with highway to be laid and building get both away from From increase and reduce so that the arrangement of highway and building apart from smaller support rod is more intensive, to improve the effect of support Fruit.
As shown in Fig. 2, in a preferred embodiment, evenly spaced laying in the soil 6 in S6 between each layer concrete 5 There is third support rod 8, the third support rod 8 is transversely arranged in the soil 6, and the both ends of the third support rod 8 point It is not fixedly connected with the side wall of the second support bar 4.
In the above scheme, by between concrete in soil third support rod setting so that roadside by first The position of the triangular support structure of the triangular support structure and building side of strut and second support bar composition is obtained into one Step is fixed, to improve enabling capabilities.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited In specific details and the legend herein shown with description.

Claims (9)

1. a kind of mistake wears construction of the highway building method for supporting, wherein the following steps are included:
S1, the soil sample for taking highway department to be laid and the both sides of highway adjacent buildings to be laid side respectively;
The soil sample that S2, chemical examination obtain, and obtained data are inputted into preset deep learning model;Wherein, the depth Learning model obtains the data training of the influence of surrounding building in excavation or disturbance by the soil of various soil parameters;
S3, according to by the data that deep learning model obtains determine first support bar length and second support bar length and Tilt angle;
S4, the first support bar of corresponding length is respectively perpendicular according to the length of the obtained first support bar of S3 squeeze into it is described wait spread If in the side of both sides of highway and the building adjacent with the both sides of highway to be laid;
S5, the tilt angle obtained the second support bar of corresponding length with S3 according to the length of the obtained second support bar of S3 by The top side of the first support bar is squeezed into soil, and makes the bottom end of the second support bar to the highway to be laid It is tilted between the building adjacent with the highway to be laid;
S6, depth is dug between the second support bar of the roadside to be laid and the second support bar of building side not less than institute The dell for stating the length of first support bar pours multi-layer concrete by the bottom of the dell, and between each layer concrete The soil dug out is backfilled, and is compacted;
S7, it is laid with highway to be laid.
2. mistake as described in claim 1 wears construction of the highway building method for supporting, wherein highway department to be laid described in S1 with And the soil sample of the both sides of highway adjacent buildings to be laid side respectively takes more parts, and the soil sample is by ground It is taken once every 30-50cm downwards, the depth selection of the soil sample is identical as base's depth of the highway to be laid.
3. mistake as described in claim 1 wears construction of the highway building method for supporting, wherein the training of the deep learning model Depth also with the base of the height of surrounding building and highway to be laid away from ground is related.
4. mistake as described in claim 1 wears construction of the highway building method for supporting, wherein be located at the both sides of highway to be laid The length of first support bar and the length of second support bar and tilt angle, and to be located at the both sides of highway to be laid adjacent Building side the length of first support bar and the length of second support bar and tilt angle pass through the deep learning Model respectively obtains.
5. mistake as described in claim 1 wears construction of the highway building method for supporting, wherein the first support bar and second One end of strut is respectively set to tip, and the first support bar and second support bar are squeezed into soil by tip;Described The non-tip of one support rod and second support bar welds together.
6. mistake as claimed in claim 5 wears construction of the highway building method for supporting, wherein the first support bar and second The distance in ground is protruded into not less than 30cm in the non-tip of strut.
7. mistake as claimed in claim 5 wears construction of the highway building method for supporting, wherein positioned at ipsilateral first support The non-tip of bar is linked together by reinforcing bar.
8. mistake as described in claim 1 wears construction of the highway building method for supporting, wherein positioned at ipsilateral adjacent two piece institute Spacing between first support bar is stated at a distance between the building adjacent with the highway to be laid of the side of highway to be laid Increase and reduce.
9. mistake as described in claim 1 wears construction of the highway building method for supporting, wherein in S6 between each layer concrete Evenly spaced in soil to be laid with third support rod, the third support rod is transversely arranged in the soil, and described The both ends of three support rods are fixedly connected with the side wall of the second support bar respectively.
CN201811500464.3A 2018-12-10 2018-12-10 Method for constructing building support through highway Expired - Fee Related CN109537418B (en)

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CN201811500464.3A CN109537418B (en) 2018-12-10 2018-12-10 Method for constructing building support through highway

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Application Number Priority Date Filing Date Title
CN201811500464.3A CN109537418B (en) 2018-12-10 2018-12-10 Method for constructing building support through highway

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CN109537418B CN109537418B (en) 2020-11-24

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CN103093400A (en) * 2013-01-24 2013-05-08 华中科技大学 Adjacent building safety quantitative evaluation method in tunnel construction
TWM495434U (en) * 2014-05-26 2015-02-11 Yang Bo Sheng Low turbulent flow impeller of liquid pump
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CN105113416A (en) * 2015-09-14 2015-12-02 中铁六局集团天津铁路建设有限公司 Construction method for frame bridge main body adjacent to existing buildings
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CN108035361A (en) * 2017-12-28 2018-05-15 上海智平基础工程有限公司 A kind of advanced support supporting construction and its construction method
CN207419555U (en) * 2017-08-29 2018-05-29 中铁四院集团岩土工程有限责任公司 A kind of high ferro bridge pier roadbed isolation error-correction structure for protecting periphery existing building
CN108560345A (en) * 2018-05-04 2018-09-21 刘刚 Road construction pretreatment unit and its construction method
CN208105278U (en) * 2018-03-01 2018-11-16 黄河科技学院 A kind of foundation pit adjustable support frame

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Publication number Priority date Publication date Assignee Title
CN201991009U (en) * 2011-01-12 2011-09-28 陕西建工集团第六建筑工程有限公司 Deep foundation pit shoring system using poured slope-supporting piles and anchor ropes
CN103093400A (en) * 2013-01-24 2013-05-08 华中科技大学 Adjacent building safety quantitative evaluation method in tunnel construction
TWM495434U (en) * 2014-05-26 2015-02-11 Yang Bo Sheng Low turbulent flow impeller of liquid pump
CN105064428A (en) * 2015-07-21 2015-11-18 上海建工七建集团有限公司 Foundation reinforcement and protection method for telegraph pole near deep foundation pit
CN105113416A (en) * 2015-09-14 2015-12-02 中铁六局集团天津铁路建设有限公司 Construction method for frame bridge main body adjacent to existing buildings
CN105756091A (en) * 2016-03-16 2016-07-13 山东理工大学 Metro station foundation pit construction method for controlling deformation of neighboring buildings
CN207092103U (en) * 2017-04-05 2018-03-13 张欢 A kind of deep foundation pit supporting structure
CN207419555U (en) * 2017-08-29 2018-05-29 中铁四院集团岩土工程有限责任公司 A kind of high ferro bridge pier roadbed isolation error-correction structure for protecting periphery existing building
CN108035361A (en) * 2017-12-28 2018-05-15 上海智平基础工程有限公司 A kind of advanced support supporting construction and its construction method
CN107938683A (en) * 2018-01-12 2018-04-20 上海智平基础工程有限公司 One kind tilts pile pit supporting construction and its construction method
CN208105278U (en) * 2018-03-01 2018-11-16 黄河科技学院 A kind of foundation pit adjustable support frame
CN108560345A (en) * 2018-05-04 2018-09-21 刘刚 Road construction pretreatment unit and its construction method

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