CN112195927B - Deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring - Google Patents
Deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring Download PDFInfo
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- CN112195927B CN112195927B CN202011050331.8A CN202011050331A CN112195927B CN 112195927 B CN112195927 B CN 112195927B CN 202011050331 A CN202011050331 A CN 202011050331A CN 112195927 B CN112195927 B CN 112195927B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention discloses a deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring, which comprises the steps of establishing a pile anchor building structure information model of a construction site by using a computer; designing a supporting system of the foundation pit according to the foundation pit condition, the foundation pile anchor condition, the construction site structural relationship, geological survey data and relevant specifications reflected by the building structure information model, drawing a supporting system design drawing by adopting a layered design concept, and designing a geological information sensing device layout drawing; excavating to a supporting pile anchor construction design working face; installing the pile anchor and the geological information sensing device according to a supporting system design drawing and a geological information sensing device layout drawing; and collecting the geological information acquired by the geological information sensing device, importing the geological information into a building structure information model, monitoring the geological information of the construction site in real time, and the like. The surrounding situation of a construction site is complex, the depth of a foundation pit is deep, and the purposes of construction economy and safety are effectively achieved by establishing a BIM structural model and monitoring and adjusting in real time.
Description
Technical Field
The invention relates to the field of construction of building foundation pits, in particular to a deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring.
Background
The prestressed pile anchor supporting structure is characterized by that it adopts drilling and grouting to form column, and can set one layer or several layers of prestressed anchor rods, and utilizes the drawing machine to apply prestress on the steel cable, and then the cement is poured into the steel cable to form pile and produce friction force with soil body so as to prevent the supporting pile from producing excessive lateral displacement. The prestressed pile-anchor supporting structure involves many disciplines, and the personnel who undertake the design must understand the civil engineering professional knowledge of many doors, and simultaneously can use various engineering techniques comprehensively to carry out pile-anchor supporting structure design to the foundation ditch, so the pile-anchor supporting structure is a discipline that the comprehensive degree of difficulty is high. The prestressed pile anchor support has the characteristics that: the construction operation mechanization degree is high, the labor consumption is reduced, the construction efficiency is high, when the construction speed is accelerated, the construction period is greatly shortened, the anti-slip performance of the pile anchor support is good, the earth excavation amount is small, the disturbance to the landslide is small, and therefore the safety performance is high during construction.
At present, when the existing pile anchor supporting structure is used for dealing with complicated and changeable terrain construction, slight geological changes are difficult to perceive, or the slight geological changes are too late when the slight geological changes are perceived, so that construction site accidents are caused, and the economy and the safety are not guaranteed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a pile-anchor support construction method for a deep foundation pit, which can monitor in real time and strain at any time.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring is characterized in that: the deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring comprises the following steps:
s1, building a pile anchor building structure information model of the construction site by using a computer based on the survey result and the construction plan of the construction site;
s2, designing a supporting system of the foundation pit according to the foundation pit condition, the foundation pile anchor condition, the construction site structural relationship, geological survey data and relevant specifications reflected by the building structure information model, drawing a supporting system design drawing by adopting a layered design concept, and designing a geological information sensing device layout drawing;
s3, uniformly excavating earthwork of a construction site to a construction design working face of a supporting pile anchor according to a supporting system design drawing;
s4, installing the pile anchor and the geological information sensing device according to the design drawing of the supporting system and the arrangement drawing of the geological information sensing device;
s5, collecting the geological information obtained by the geological information induction device, importing the geological information into a building structure information model, and monitoring the geological information of the construction site in real time;
s6, dynamically simulating the number of wales, the length of the pile anchor, the anchoring value and the like in the pile anchor supporting system according to the geological information acquired by the geological information sensing device, and designing a secondary design scheme which can ensure both safety and economy;
s7, constructing a pile-anchor supporting system according to the design scheme;
and S8, performing foundation pit excavation, monitoring the geological information acquired by the geological information sensing device in real time, early warning risks in the construction process, and adjusting the construction scheme according to the building structure information model.
As a further improvement of the above technical solution:
preferably, the step S2 of drawing the supporting system design drawing by adopting the concept of layered design is designed according to the geological conditions of the construction site and the safety index and economic index of the pile-anchor supporting system.
Preferably, the geological information sensing means in step S2 includes at least a stress sensor, a displacement sensor and a humidity sensor.
Preferably, the mounting step of step S4 specifically includes:
the method comprises the following steps: constructing a pile anchor hole by using a drilling machine according to a design drawing of a supporting system;
step two: digging a geological information sensing device mounting hole on the hole wall close to the outer side of the foundation pit in the drilled pile anchor hole according to a geological information sensing device layout;
step three: installing the geological information sensing device into the installation hole, and installing a protective device to isolate concrete grout;
step four: and (5) installing pile anchors and setting the reserved installation position of the waist beam.
Preferably, the step four of installing the pile anchor specifically includes: cleaning the mounting hole, putting the steel bar cylinder into the mounting hole, grouting concrete and performing secondary grouting.
Preferably, the geological information obtained by the information sensing device in step S5 is transmitted to the central control room through the transmission device, the construction side monitors in real time, and the information sensing device is further connected to an alarm device to give an alarm when an abnormal condition occurs.
Preferably, the alarm device comprises at least one of an audible alarm, a light source alarm and a vibratory alarm.
Preferably, the construction of the pile-anchor supporting system in the step S7 includes the following specific steps:
the method comprises the following steps: emptying a soil layer at the position of the pile anchor close to the inner side of the foundation pit;
secondly, mounting the waist rail at the reserved waist rail mounting position according to a secondary design scheme;
step three: and laying a reinforcing mesh in the area divided by the pile anchor and the waist beam, and pouring concrete to form the retaining wall.
Preferably, the pile anchor supporting system adopts vertical support.
Preferably, the supporting system is not dismantled after the foundation pit construction is finished, becomes a part of an underground foundation, and keeps monitoring and early warning on the building.
Compared with the prior art, the invention has the advantages that:
1. according to the deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring, the situation around a construction site is complex, the depth of a foundation pit is deep, a multi-section anchor pile support form is adopted by establishing a BIM structural model, and when the actual geological inconsistency occurs in the site, the dynamic adjustment is carried out in time, so that the purposes of construction economy and safety are effectively achieved.
2. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring disclosed by the invention has the advantages that the deep foundation pit anchor pile support monitoring data is tested and automatically collected and manually retested, the data is timely led into a BIM (building information model) for deformation early warning and analysis, the foundation pit change condition is timely transmitted to site management, supervision and owners through an informatization means, the data is dynamically collected for summarization, and the risk early warning is carried out in advance by utilizing a big data means for analysis.
3. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring does not need to be dismantled after the foundation pit construction is finished, becomes a part of an underground foundation, and keeps monitoring and early warning on a building.
Drawings
FIG. 1 is a flow chart of the steps of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
A project of transforming a canopy user area of a city area of a Chong left city is a first-stage project of installing a cell in the south of the city, the project is positioned on the south side of a Dong alliance main road of the Jiangzhou area of the Chong left city, and the surrounding environment is complex: the Donglin Huarun complex construction project, the south Lin Mai water bridge school and the Bolicun, the west Lin Dong Luo (province lane 213), the north Lin Dong Union avenue and the high international furniture square. The first-stage project is divided into three blocks A1, A2 and A3, the total land area is 175352.0 square meters (263 mu), the total building area is 405086.4 square meters, and the first-stage project comprises 13 high floors and 20 supporting service rooms with 3 floors. The underground 1 floor of A1 zone and A2 zone is garage and equipment room, and the underground 1 floor and 2 floor of A3 zone are garage (also called civil air defense basement) and equipment room.
The Guangxi karst landform is complex in landform and is a project close to main municipal roads, businesses, schools and villages, the construction method is adopted to achieve the safety purpose of a basement construction stage, the anchor pile supporting method is adopted to give full play to detailed exploration and construction investigation as design and construction basis, and the multi-section anchor pile supporting mode is utilized to adopt an economical and feasible supporting method on the premise of ensuring safety.
As shown in fig. 1, the deep foundation pit pile-anchor support construction method using foundation pit deformation monitoring according to the present embodiment includes the following steps:
s1, building a pile anchor building structure information model of the construction site by using a computer based on the survey result and the construction plan of the construction site; and modeling by using a BIM technology according to the construction planning diagram and the field measurement data.
S2, designing a supporting system of the foundation pit according to the foundation pit condition, the foundation pile anchor condition, the construction site structural relationship, geological survey data and relevant specifications reflected by the building structure information model, drawing a supporting system design drawing by adopting a layered design concept, designing a left city urban canopy area reconstruction project, dividing the basement into three layers, and designing a supporting system into three layers; designing a geological information sensing device layout; and designing a supporting system and a geological information sensing device layout according to the modeling condition.
S3, uniformly excavating earthwork of a construction site to a construction design working face of a supporting pile anchor according to a supporting system design drawing; and after the shed area is dismantled, cleaning the ground construction waste, and digging down by a digging machine for 1.5 m.
S4, installing the pile anchor and the geological information sensing device according to the design drawing of the supporting system and the arrangement drawing of the geological information sensing device; around the foundation pit dug by the excavator, pile anchors are buried at intervals of 5m, and a geological information sensing device is installed.
S5, collecting the geological information obtained by the geological information induction device, importing the geological information into a building structure information model, and monitoring the geological information of the construction site in real time; a project for improving a canopy region of an urban area in a Chong left city is characterized in that the underground is a Kaster terrain and most limestone is used, and geological monitoring is carried out for 24 hours after a building structure information model is imported.
S6, dynamically simulating the number of wales, the length of the pile anchor, the anchoring value and the like in the pile anchor supporting system according to the geological information acquired by the geological information sensing device, and designing a secondary design scheme which can ensure both safety and economy; the underground foundation pit does not penetrate through a limestone layer, the length of the designed pile anchor is 3.5m, the waist beam is designed into 3 waist beams, and the pile anchors are designed at intervals of 1 m.
S7, constructing a pile-anchor supporting system according to the design scheme; according to the secondary design scheme, marking and positioning are carried out, a drilling platform is used for punching, a geological information sensing device mounting hole is opened in the hole, the geological information sensing device is installed in the hole, the hole is sealed by a steel plate, a woven steel bar cylinder is placed in the hole, cement grouting and secondary grouting are carried out, a waist rail steel bar cylinder is welded, a template is erected, and concrete pouring of the waist rail is carried out.
And S8, performing foundation pit excavation, monitoring the geological information acquired by the geological information sensing device in real time, early warning risks in the construction process, and adjusting the construction scheme according to the building structure information model. And after the first layer of supporting system is arranged, excavating a foundation pit, carrying out the construction of the next layer of supporting body when the bottom of the pile anchor is excavated, and repeating the steps on the third layer.
As shown in fig. 2, the system of the present embodiment includes a wale, a pile anchor and a geological information sensing device.
Further, the step S2 of drawing the design drawing of the supporting system by adopting the concept of layered design is designed according to the geological conditions of the construction site and the safety index and economic index of the pile-anchor supporting system.
Further, the geological information sensing device in step S2 at least includes a stress sensor, a displacement sensor and a humidity sensor.
Further, the mounting step of step S4 specifically includes:
the method comprises the following steps: constructing a pile anchor hole by using a drilling machine according to a design drawing of a supporting system;
step two: digging a geological information sensing device mounting hole on the hole wall close to the outer side of the foundation pit in the drilled pile anchor hole according to a geological information sensing device layout;
step three: installing the geological information sensing device into the installation hole, and installing a protective device to isolate concrete grout;
step four: and (5) installing pile anchors and setting the reserved installation position of the waist beam.
Further, the geological information obtained by the information sensing device in the step S5 is transmitted to the central control room through the transmission device, the construction side monitors in real time, and the information sensing device is also connected with an alarm device to give an alarm when an abnormal condition occurs.
Further, the alarm device at least comprises one of an acoustic alarm, a light source alarm and a vibration alarm, and the acoustic alarm device is adopted in the embodiment.
Further, the construction of the pile-anchor supporting system in the step S7 specifically comprises the following steps:
the method comprises the following steps: emptying a soil layer at the position of the pile anchor close to the inner side of the foundation pit;
secondly, mounting the waist rail at the reserved waist rail mounting position according to a secondary design scheme;
step three: and laying a reinforcing mesh in the area divided by the pile anchor and the waist beam, and pouring concrete to form the retaining wall.
Further, a pile anchor supporting system adopts vertical supporting.
Furthermore, the support system is not dismantled after the foundation pit construction is finished, becomes a part of an underground foundation, and keeps monitoring and early warning on the building.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring is characterized in that: the deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring comprises the following steps:
s1, building a pile anchor building structure information model of the construction site by using a computer based on the survey result and the construction plan of the construction site;
s2, designing a supporting system of the foundation pit according to the foundation pit condition, the foundation pile anchor condition, the construction site structural relationship, geological survey data and relevant specifications reflected by the building structure information model, drawing a supporting system design drawing by adopting a layered design concept, and designing a geological information sensing device layout drawing;
s3, uniformly excavating earthwork of a construction site to a construction design working face of a supporting pile anchor according to a supporting system design drawing;
s4, according to the design drawing of the supporting system and the arrangement drawing of the geological information sensing device, the installation of the pile anchor and the geological information sensing device comprises the following steps: constructing a pile anchor hole by using a drilling machine according to a design drawing of a supporting system;
digging a geological information sensing device mounting hole on the hole wall close to the outer side of the foundation pit in the drilled pile anchor hole according to a geological information sensing device layout;
installing the geological information sensing device into the installation hole, and installing a protective device to isolate concrete grout;
installing pile anchors and setting the reserved installation position of the waist beam;
s5, collecting the geological information obtained by the geological information induction device, importing the geological information into a building structure information model, and monitoring the geological information of the construction site in real time;
s6, dynamically simulating the number of wales, the length of the pile anchor and the anchoring value in the pile anchor supporting system according to the geological information acquired by the geological information sensing device, and designing a secondary design scheme which can ensure both safety and economy;
s7, constructing a pile-anchor supporting system according to the design scheme, which comprises the following steps: emptying a soil layer at the position of the pile anchor close to the inner side of the foundation pit;
according to the secondary design scheme, a waist rail is arranged at the waist rail installation reserved position;
paving a reinforcing mesh in the area divided by the pile anchor and the waist beam, and pouring concrete to form a retaining wall;
and S8, performing foundation pit excavation, monitoring the geological information acquired by the geological information sensing device in real time, early warning risks in the construction process, and adjusting the construction scheme according to the building structure information model.
2. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring as claimed in claim 1, wherein: and step S2, drawing a design drawing of the supporting system by adopting a layered design concept is designed according to the geological condition of the construction site and the safety index and the economic index of the pile-anchor supporting system.
3. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring as claimed in claim 1, wherein: the geological information sensing device in step S2 at least includes a stress sensor, a displacement sensor and a humidity sensor.
4. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring as claimed in claim 1, wherein: the step of installing the pile anchor in the step S4 specifically comprises the following steps: cleaning the mounting hole, putting the steel bar cylinder into the mounting hole, grouting concrete and performing secondary grouting.
5. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring as claimed in claim 1, wherein: and S5, the geological information acquired by the information sensing device is transmitted to the central control room through the transmission device, the construction party monitors in real time, and the information sensing device is also connected with an alarm device to give an alarm when abnormal conditions occur.
6. The deep foundation pit pile anchor support construction method adopting foundation pit deformation monitoring as claimed in claim 5, wherein: the alarm device at least comprises one of an acoustic alarm, a light source alarm and a vibration alarm.
7. The deep foundation pit pile-anchor support construction method adopting foundation pit deformation monitoring as claimed in any one of claims 1 to 6, wherein: the pile anchor supporting system adopts vertical supporting.
8. The deep foundation pit pile-anchor support construction method adopting foundation pit deformation monitoring as claimed in any one of claims 1 to 6, wherein: the supporting system is not dismantled after the foundation pit construction is finished, becomes a part of an underground foundation, and keeps monitoring and early warning on the building.
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| CN115652960A (en) * | 2022-11-04 | 2023-01-31 | 中建八局第二建设有限公司 | BIM and oblique photography-based slope support construction method |
| CN117371954B (en) * | 2023-10-30 | 2024-04-05 | 常瑞君 | Method and system for managing civil engineering construction process |
| CN117627528B (en) * | 2024-01-25 | 2024-05-03 | 中建五局第三建设有限公司 | Construction device and construction method of jumbolter for deep foundation pit |
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