CN110029693B - Experimental method for simulating influence of blasting demolition of deep foundation pit support beam on reserved structure - Google Patents
Experimental method for simulating influence of blasting demolition of deep foundation pit support beam on reserved structure Download PDFInfo
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- CN110029693B CN110029693B CN201910351505.5A CN201910351505A CN110029693B CN 110029693 B CN110029693 B CN 110029693B CN 201910351505 A CN201910351505 A CN 201910351505A CN 110029693 B CN110029693 B CN 110029693B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention discloses an experimental method for simulating the influence of blasting demolition of a deep foundation pit supporting beam on a reserved structure, which comprises a separated hydraulic jack, an electric synchronous one-to-four hydraulic pump station, a hydraulic oil pipe, a load transfer steel plate, concrete, a steel bar, a peripheral counterforce steel frame and sandy soil, and comprises the following specific operation steps: s1, excavating a field: excavating a regular L-shaped section on an experimental site1Width of D1Deep is H1The cuboid pit is a main field for simulating the influence experiment of deep foundation pit supporting beam blasting demolition on the reserved structure; s2, pouring concrete: pouring the inner wall of the pit with the thickness d1The layer of concrete is called as peripheral concrete, and mainly plays a role in protecting pit wall rules and preventing a peripheral counterforce steel frame from generating large deformation; s3, welding a steel frame; s4, building and removing the template; and S5, pouring the support beam. The invention can simplify the actual engineering into an experimental model by a similarity law, and takes the action of soil pressure and the action of blasting load impact into consideration in the experiment.
Description
Technical Field
The invention relates to the technical field of blasting demolition of a foundation pit support beam, in particular to an experimental method for simulating the influence of blasting demolition of a deep foundation pit support beam on a reserved structure.
Background
The foundation pit maintenance structure mainly bears water pressure and soil pressure generated by unloading during foundation pit excavation and transmits the pressure to the support, and the foundation pit maintenance structure is a temporary retaining wall construction structure for stabilizing the foundation pit. After the excavation of the foundation pit is completed, these temporary support structures are removed, and then the interior construction of the basement is completed. In the construction process of demolishing the reinforced concrete support of the foundation pit, part of the supporting structure at the periphery of the foundation pit needs to be protected, and the supporting structure can not be damaged by the explosive load. Wherein the underground diaphragm wall structure may be used as all or a portion of a permanent structure. Therefore, the safety of the underground diaphragm wall must be considered when the support beam is demolished by blasting. In addition, for the deep foundation pit, along with the increase of the excavation depth, the soil pressure and the water pressure on the foundation pit wall can also be increased, the pressures are transmitted to the supporting beam, and after the temporary supporting beam is demolished by blasting, the axial pressure on the supporting beam can also be unloaded in a transient state, so that when the supporting beam of the deep foundation pit is demolished, the retaining structure not only can be subjected to blasting impact load, but also can be subjected to unloading load at the position where the supporting beam is subjected to larger axial pressure.
At present, the method for researching the influence of deep foundation pit support beam blasting demolition on the reserved structure is mainly based on numerical simulation, and the method is invented for optimizing the demolition support sequence to reduce the influence on the reserved part. Since the numerically simulated material and model are not perfectly matched to the actual engineering, large errors may be generated during the research process. The cost of field experiments is high and there is a high risk. In view of the above, the invention provides an experimental method for simulating the influence of blasting demolition of a deep foundation pit supporting beam on a reserved structure, which simplifies the actual engineering into an experimental model through a similarity law, considers the action of soil pressure and the action of blasting load impact in the experiment, and provides a pouring forming method of the foundation pit and the supporting beam in a sample model.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an experimental method for simulating the influence of blasting demolition of a deep foundation pit support beam on a reserved structure.
The invention provides an experimental method for simulating the influence of blasting demolition of a deep foundation pit supporting beam on a reserved structure, wherein equipment required by an experiment comprises a separated hydraulic jack, an electric synchronous one-to-four hydraulic pump station, a hydraulic oil pipe, a carrying steel plate, concrete, a reinforcing steel bar, a peripheral counterforce steel frame and sandy soil, and the method comprises the following specific operation steps of:
s1, excavating a field: excavating a regular L-shaped section on an experimental site1Width of D1Deep is H1The cuboid pit is a main field for simulating the influence experiment of deep foundation pit supporting beam blasting demolition on the reserved structure;
s2, pouring concrete: pouring the thickness d on the inner wall of the deep foundation pit1The layer of concrete is called as peripheral concrete and mainly plays a role in protecting the pit wall rule of the deep foundation pit;
s3, welding a steel frame: adding a layer of thick concrete to the inner wall of the peripheral concrete2The steel plates on the periphery of the inner wall are welded pairwise, the welded steel plates are combined into a steel frame, the steel frame is called a peripheral counterforce steel frame, peripheral concrete prevents the peripheral counterforce steel frame from generating large deformation, provides stable counterforce when equivalent soil pressure load is applied subsequently, and plays a role in fixing the separated hydraulic jack;
s4, building and removing the template: building a template inside the peripheral counterforce steel frame, pouring the outer wall of the deep foundation pit required by the experiment in the template, determining the length and width of the outer wall according to the practical engineering size according to the similar theory, ensuring that two adjacent surfaces of the outer wall of the deep foundation pit are close to two adjacent surfaces of the inner wall of the peripheral counterforce steel frame at the position of the pit wall of the deep foundation pit, and leaving the width of d3The width of the other two adjacent surfaces of the outer wall of the deep foundation pit and the other two adjacent surfaces of the inner wall of the peripheral counterforce steel frame is reserved as d4Has a width d3Is used for filling sand and soil in the pores with the width d4The hole is used for installing a soil stress equivalent applying device, the device comprises a separated hydraulic jack and a load transmission steel plate, and a template is removed in time after the concrete is formed;
s5, pouring the support beam: the method for pouring the supporting beam is opposite to the actual engineering, the lowest supporting plate is poured in the deep foundation pit through the concrete pouring column and the sandy soil is installed, the template is installed on the basis of the supporting plate, then the supporting plate above the template is poured through the concrete pouring column and the sandy soil is installed, so that the supporting plates are poured one by one from the bottom upwards, and the supporting beams are finally poured after the supporting plates are installed.
Preferably, reinforcing steel bars or steel wires are placed in the deep foundation pit wall in the same proportion.
Preferably, the width between the load-carrying steel plate and the foundation pit is d3The pores are also used for filling sand.
Preferably, the four separated hydraulic jacks are supported between the load-carrying steel plate and the peripheral counterforce steel frame at equal intervals, and are connected with an electric synchronous one-to-four hydraulic pump station through hydraulic oil pipes.
Preferably, the wall of the deep foundation pit is an underground continuous wall or a cast pile.
The manufacturing method is simple, practical engineering can be simplified into an experimental model through a similarity law, the effect of soil pressure and the effect of blasting load impact are considered in the experiment, and the pouring forming method of the foundation pit and the supporting beam in the sample model is provided, so that the method is safer and more stable.
Drawings
FIG. 1 is a top view of a foundation pit experimental model for simulating an experimental method for the influence of blasting demolition of a deep foundation pit supporting beam on a reserved structure, provided by the invention;
FIG. 2 is a side view of a foundation pit experimental model for simulating an experimental method for the influence of blasting demolition of a deep foundation pit support beam on a reserved structure, provided by the invention;
FIG. 3 is a schematic diagram of a fourth supporting beam pouring for simulating an experimental method of deep foundation pit supporting beam blasting demolition on a reserved structure according to the invention;
fig. 4 is a schematic diagram of a third supporting beam pouring of the experimental method for simulating the influence of blasting demolition of the supporting beam of the deep foundation pit on the reserved structure.
In the figure: peripheral concrete 1, peripheral reaction steel frame 2, 3 sand, 4 deep basal pits, 5 disconnect-type hydraulic jacks, 6 carry steel sheets, 7 electric synchronous one-to-four hydraulic pump stations, 8 hydraulic oil pipes, 9 concrete pouring columns, 10 supporting plates and 11 formworks.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Referring to fig. 1-4, the invention provides an experimental method for simulating the influence of blasting demolition of a deep foundation pit supporting beam on a reserved structure, wherein the equipment required by the experiment comprises a separated hydraulic jack 5, an electric synchronous one-driving-four hydraulic pump station 7, a hydraulic oil pipe 8, a carrying steel plate 6, concrete, a steel bar, a peripheral counterforce steel frame 2 and sandy soil 3, and the specific operation steps are as follows:
s1, excavating a field: excavating a regular L-shaped section on an experimental site1Width of D1Deep is H1The cuboid pit is a main field for simulating the influence experiment of blasting demolition of the deep foundation pit 4 supporting beam on the reserved structure;
s2, pouring concrete: pouring the inner wall of the pit with the thickness d1The layer of concrete is called as peripheral concrete 1, and mainly plays a role in protecting the pit wall rule of the deep foundation pit 4 and preventing the peripheral counterforce steel frame 2 from generating large deformation;
s3, welding a steel frame: adding a layer of thick concrete with thickness d on the inner wall of the peripheral concrete 12The steel plates on the periphery of the inner wall are welded pairwise, the welded steel plates are combined into a steel frame, the steel frame is called a peripheral counterforce steel frame 2, stable counterforce is provided when equivalent soil pressure load is applied subsequently, and the steel frame plays a role in fixing the separated hydraulic jack 5;
s4, building and removing the template 11: building a template 11 inside the peripheral reaction steel frame 2, pouring the outer wall of the deep foundation pit 4 required by the experiment in the template 11, determining the length and width of the outer wall according to the practical engineering size and the similar theory, and positioning the pit wall of the deep foundation pit 4The two adjacent surfaces of the outer wall of the foundation pit are close to the two adjacent surfaces of the inner wall of the peripheral counterforce steel frame 2, and the free width is d3The other two adjacent surfaces of the outer wall of the foundation pit and the other two adjacent surfaces of the inner wall of the peripheral counterforce steel frame 2 are reserved with the width d4Has a width d3Is used for filling sand 3 with a width d4The hole is used for installing a soil stress equivalent applying device, the device comprises a separated hydraulic jack 5 and a load transmission steel plate 6, and a template 11 is removed in time after the concrete is formed;
s5, pouring the support beam: the method for pouring the supporting beam is opposite to the actual engineering, a bottommost supporting plate 10 is poured in the deep foundation pit 4 through a concrete pouring column 9 and sand 3 is installed, a template 11 is installed on the basis of the supporting plate 10, then the supporting plate 10 above the template 11 is poured through the concrete pouring column 9 and the sand 3, so that the supporting plates 10 are poured one by one from the bottom upwards, and the supporting beams are finally poured after the supporting plates 10 are installed.
The manufacturing method is simple, the reinforcing steel bars or steel wires can be placed in the foundation pit wall in the same proportion, the overall stability is greatly improved, and the width d is arranged between the load transmission steel plate 6 and the foundation pit3The hole, this hole also is used for filling sand 3, four disconnect-type hydraulic jack 5 equidistant tops carry steel sheet 6 and peripheral counter-force steelframe 2 within a definite time, four disconnect-type hydraulic jack 5 are connected with electronic synchronous one drags four hydraulic power unit 7 through hydraulic pressure oil pipe 8 for carry the holding power that steel sheet 6 and peripheral counter-force steelframe 2 within a definite time and can evenly distributed, improve the holding power, the hole wall of deep basal pit 4 is for underground continuous wall or waters and builds the stake.
According to the invention, the actual engineering can be simplified into the experimental model through the similarity law, the action of soil pressure and the action of blasting load impact are considered in the experiment, and the pouring forming method of the foundation pit and the supporting beam in the sample model is provided, so that the method is safer and more stable.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a simulation deep basal pit supporting beam blasting demolishs experimental method to remaining structure influence, its characterized in that, the required equipment of experiment includes disconnect-type hydraulic jack (5), electronic synchronous one drags four hydraulic power unit (7), hydraulic pressure oil pipe (8), carries steel sheet (6), concrete, reinforcing bar, peripheral counter-force steelframe (2), sand (3), and concrete operation step is as follows:
s1, excavating a field: excavating a regular L-shaped section on an experimental site1Width of D1Deep is H1The cuboid pit is a main field for simulating the influence experiment of blasting demolition of the support beam of the deep foundation pit (4) on the reserved structure;
s2, pouring concrete: the inner wall of the deep foundation pit (4) is poured to a thickness d1The layer of concrete is called as peripheral concrete (1) and mainly plays a role in protecting the pit wall regularity of the deep foundation pit (4);
s3, welding a steel frame: adding a layer of thick concrete (1) on the inner wall of the periphery2The steel plates on the periphery of the inner wall are welded pairwise, the welded steel plates are combined into a steel frame, the steel frame is called a peripheral counterforce steel frame (2), the peripheral concrete (1) prevents the peripheral counterforce steel frame (2) from generating large deformation, provides stable counterforce when equivalent soil pressure load is applied subsequently, and plays a role in fixing the separated hydraulic jack (5);
s4, building and removing the template (11): template (11) is built to the inside of peripheral reaction steelframe (2), pours the required deep basal pit (4) outer wall of experiment in template (11), and its length and width is confirmed according to similar theory according to actual engineering size, and the position of deep basal pit (4) wall should guarantee that two adjacent surfaces of deep basal pit (4) outer wall are pressed close to with two adjacent surfaces of peripheral reaction steelframe (2) inner wall, and vacate the width and be d3The width d of the other two adjacent surfaces of the outer wall of the deep foundation pit (4) and the other two adjacent surfaces of the inner wall of the peripheral counterforce steel frame (2) is reserved4Has a width d3Is used for filling sand (3) in the pores, and has a width d4The pore is used for installing the soilThe device comprises a separated hydraulic jack (5) and a load transmission steel plate (6), and the template (11) is removed in time after the concrete is formed;
s5, pouring the support beam: the pouring method of the supporting beam is opposite to the actual engineering, a bottommost supporting plate (10) is poured in a deep foundation pit (4) through a concrete pouring column (9) and sand and soil (3) is installed, a template (11) is installed on the basis of the supporting plate (10), then the supporting plate (10) above the template (11) is poured through the concrete pouring column (9) and the sand and soil (3) is installed, so that the supporting plates (10) are poured one by one from the bottom upwards, and the supporting beam is finally poured after the supporting plates (10) are installed.
2. The experimental method for simulating the influence of blasting demolition of a deep foundation pit support beam on a reserved structure according to claim 1, wherein steel bars or steel wires are placed in the pit wall of the deep foundation pit (4) in the same proportion.
3. The experimental method for simulating the influence of blasting demolition of a support beam of a deep foundation pit on a reserved structure according to claim 1, wherein the width d between the load-transferring steel plate (6) and the foundation pit is3Also used for filling sand (3).
4. The experimental method for simulating the influence of deep foundation pit support beam blasting demolition on reserved structures according to claim 1, wherein four separated hydraulic jacks (5) are supported between a load-carrying steel plate (6) and a peripheral counterforce steel frame (2) at equal intervals, and the four separated hydraulic jacks (5) are connected with an electric synchronous one-to-four hydraulic pump station (7) through hydraulic oil pipes (8).
5. The experimental method for simulating the influence of blasting demolition of a deep foundation pit support beam on a reserved structure according to claim 1, wherein the pit wall of the deep foundation pit (4) is an underground continuous wall or a cast pile.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296644A (en) * | 2010-06-28 | 2011-12-28 | 上海隧道工程股份有限公司 | Vibration safety monitoring system and monitoring method for brace blasting demolition in foundation pit |
| KR101140764B1 (en) * | 2011-07-20 | 2012-05-03 | 한국지질자원연구원 | Method for estimating the ground vibration produced from impact of collapsing structure in case explosive demolition |
| CN105809610A (en) * | 2014-12-30 | 2016-07-27 | 上海浦东建筑设计研究院有限公司 | Evaluation method for evaluating influence of demolished shoring of trench on surrounding stratum |
| CN105926686A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing system and method studying common character of composite foundation and support structure |
| CN106055801A (en) * | 2016-06-03 | 2016-10-26 | 武汉科技大学 | Method for determining blasting demolition order of deep foundation pit support beams |
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- 2019-04-28 CN CN201910351505.5A patent/CN110029693B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296644A (en) * | 2010-06-28 | 2011-12-28 | 上海隧道工程股份有限公司 | Vibration safety monitoring system and monitoring method for brace blasting demolition in foundation pit |
| KR101140764B1 (en) * | 2011-07-20 | 2012-05-03 | 한국지질자원연구원 | Method for estimating the ground vibration produced from impact of collapsing structure in case explosive demolition |
| CN105809610A (en) * | 2014-12-30 | 2016-07-27 | 上海浦东建筑设计研究院有限公司 | Evaluation method for evaluating influence of demolished shoring of trench on surrounding stratum |
| CN105926686A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing system and method studying common character of composite foundation and support structure |
| CN106055801A (en) * | 2016-06-03 | 2016-10-26 | 武汉科技大学 | Method for determining blasting demolition order of deep foundation pit support beams |
Non-Patent Citations (2)
| Title |
|---|
| 丰满扩建永庆反调节水库混凝土围堰爆破拆除试验;高岳等;《东北水利水电》;20111231(第09期);全文 * |
| 武汉某深基坑支撑梁爆破拆除顺序研究;钟冬望等;《爆破》;20171231(第02期);全文 * |
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