CN110029693A - A kind of experimental method that simulation Brace in Deep Footing Groove beam demolition blasting influences reservation structure - Google Patents
A kind of experimental method that simulation Brace in Deep Footing Groove beam demolition blasting influences reservation structure Download PDFInfo
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- CN110029693A CN110029693A CN201910351505.5A CN201910351505A CN110029693A CN 110029693 A CN110029693 A CN 110029693A CN 201910351505 A CN201910351505 A CN 201910351505A CN 110029693 A CN110029693 A CN 110029693A
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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 kind of simulation Brace in Deep Footing Groove beam demolition blastings on the experimental method for retaining structure influence, four hydraulic power units, hydraulic oil pipe, posting steel plate, concrete, reinforcing bar, peripheral counter-force steelframe, sandy soil are dragged including separated type hydraulic jack, electric synchronous one, specific steps are as follows: S1, excavates place: excavating a regular a length of L on experimental site1, width D1, depth H1Cuboid hole, the cuboid hole be simulate Brace in Deep Footing Groove beam demolition blasting on retain structure influence experiment main place；S2, casting concrete: it is d that the inner wall in hole, which pours thickness,1Concrete, which is known as peripheral concrete, primarily serves protection crater wall rule, prevents peripheral counter-force steelframe from generating large deformation；S3, welding steel structure；S4, builds and form removal；S5, supporting beam pour.Practical Project can be simplified to experimental model by the law of similitude by the present invention, consider soil pressure effect, explosive load percussion in an experiment.
Description
Technical field
The present invention relates to foundation pit supporting beam Blasting Demolition Technology field more particularly to a kind of simulation Brace in Deep Footing Groove beam explosions
It removes on the experimental method for retaining structure influence.
Background technique
Pit maintenance soil structure is primarily subjected to water pressure and soil pressure caused by Unloading, and this pressure is transmitted
It is the interim barrier wall structure of a kind of construction for stablizing foundation pit to support.After the completion of excavation of foundation pit, these temporary support structures all will
It removes, the inside for subsequently completing basement is built.In foundation pit reinforced concrete blasting demolition girder work progress, foundation pit periphery has
Part supporting construction is need to be to be protected, it is desirable that explosive load cannot damage it.Wherein, continuous underground wall structure can be made
For all or part of use of permanent structure.Therefore, in supporting beam demolition blasting, it is necessary to consider the safety of diaphram wall
Property problem.In addition, soil pressure and water pressure in foundation pit walls can also increase with the increase of cutting depth for deep basal pit
Add, and these pressure will be transmitted in supporting beam, after demolition blasting temporary support beam, the axis pressure in supporting beam also unloads transient state
It carries, therefore, when removing Brace in Deep Footing Groove beam, for retaining structure, not only will receive blasting impact load, in supporting beam
Pressed biggish position that can also be acted on by unloading by axis.
Currently, being mainly in Numerical-Mode on the research method that structure influences is retained for Brace in Deep Footing Groove beam demolition blasting
It is quasi-, it has partially invented optimization and has removed support sequence to reduce the influence to part is retained.Not due to numerical simulation material and model
It can be matched completely with Practical Project, so there may be very big errors in research process.The at high cost and presence of field experiment is very
High risk.In view of this, the present invention proposes a kind of experimental method that simulation Brace in Deep Footing Groove beam demolition blasting influences reservation structure,
Practical Project is simplified to experimental model by the law of similitude, considers soil pressure effect, explosive load percussion in an experiment, and
Provide the pouring molding method of foundation pit and supporting beam in sample model.
Summary of the invention
Technical problems based on background technology, the invention proposes a kind of simulation Brace in Deep Footing Groove beam demolition blastings pair
Retain the experimental method that structure influences.
A kind of simulation Brace in Deep Footing Groove beam demolition blasting proposed by the present invention is on the experimental method for retaining structure influence, experiment
Required equipment include separated type hydraulic jack, electric synchronous one drag four hydraulic power units, hydraulic oil pipe, posting steel plate, concrete,
Reinforcing bar, peripheral counter-force steelframe, sandy soil, specific steps are as follows:
S1 excavates place: a regular a length of L is excavated on experimental site1, width D1, depth H1Cuboid hole,
Cuboid hole is to simulate Brace in Deep Footing Groove beam demolition blasting to the main place for retaining structure influence experiment；
S2, casting concrete: pouring thickness in deep basal pit inner wall is d1Concrete, which is known as peripheral coagulation
Soil primarily serves protection Wall of Deep Foundation Pit rule；
S3, welding steel structure: adding a thickness again in peripheral concrete inner wall is d2Steel plate, by the steel plate two of inner wall surrounding
Two welding, for the steel plate combination after welding at a steelframe, which is known as peripheral counter-force steelframe, and peripheral concrete prevents peripheral anti-
Power steelframe generates large deformation, provides in the equivalent soil pressure load of subsequent application and stablizes counter-force, and it is hydraulic to play fixedly separated formula
The effect of jack；
S4, builds and form removal: template is built in the inside of peripheral counter-force steelframe, and it is desired that experiment is poured in template
Deep basal pit outer wall, length and width determine that the position of Wall of Deep Foundation Pit should ensure that deep basal pit by the theory of similarity according to Practical Project size
Two adjacent surfaces of two adjacent surfaces of outer wall and peripheral counter-force steelframe inner wall are close to and vacating width is d3Hole, in deep basal pit
It is d that another two adjacent surface of the inner wall of the another two adjacent surface of outer wall and peripheral counter-force steelframe, which reserves width,4Hole, width d3
Hole in for loading sandy soil, width d4Hole for installing the equivalent bringing device of soil stress, in the device comprising point
From formula hydraulic jack and posting steel plate, template of dismantling in time after the above concrete formation；
S5, supporting beam pour: the casting method of supporting beam is with Practical Project on the contrary, being poured in deep basal pit by concrete
It builds stake to pour and sandy soil installation support plate, installation template on the basis of support plate, then pass through concrete casting in template
Column pours and sandy soil installation support plate, is supported pouring for plate one by one bottom-up to realize.
Preferably, reinforcing bar or steel wire can be put into the Wall of Deep Foundation Pit in proportion.
Preferably, having width between the posting steel plate and foundation pit is d3Hole, the hole be also used for filling sandy soil.
Preferably, four separated type hydraulic jacks are withstood at equal intervals between posting steel plate and peripheral counter-force steelframe,
Four separated type hydraulic jacks drag four hydraulic power units to connect by hydraulic oil pipe with electric synchronous one.
Preferably, the crater wall of the deep basal pit is diaphram wall or pours stake.
Production method of the present invention is simple, Practical Project can be simplified to experimental model by the law of similitude, examined in an experiment
Consider soil pressure effect, explosive load percussion, and provide the pouring molding method of foundation pit and supporting beam in sample model, more
Safety and firmness.
Detailed description of the invention
Fig. 1 is a kind of simulation Brace in Deep Footing Groove beam demolition blasting proposed by the present invention on the experimental method for retaining structure influence
Foundation pit experimental model top view；
Fig. 2 is a kind of simulation Brace in Deep Footing Groove beam demolition blasting proposed by the present invention on the experimental method for retaining structure influence
Foundation pit experimental model side view；
Fig. 3 is a kind of simulation Brace in Deep Footing Groove beam demolition blasting proposed by the present invention on the experimental method for retaining structure influence
The 4th supporting beam pour schematic diagram；
Fig. 4 is a kind of simulation Brace in Deep Footing Groove beam demolition blasting proposed by the present invention on the experimental method for retaining structure influence
Third road supporting beam pour schematic diagram.
In figure: 1 peripheral concrete, 2 peripheral counter-force steelframes, 3 sandy soil, 4 deep basal pits, 5 separated type hydraulic jacks, 6 postings
Steel plate, 7 electric synchronous one drag four hydraulic power units, 8 hydraulic oil pipes, 9 concrete casting columns, 10 support plates, 11 templates.
Specific embodiment
Combined with specific embodiments below the present invention is made further to explain.
Referring to Fig.1-4, a kind of simulation Brace in Deep Footing Groove beam demolition blasting proposed by the present invention is on the reality for retaining structure influence
Proved recipe method, equipment needed for testing include that separated type hydraulic jack 5, electric synchronous one drag four hydraulic power units 7, hydraulic oil pipe 8, pass
Steel plate 6, concrete, reinforcing bar, peripheral counter-force steelframe 2, sandy soil 3 are carried, specific steps are as follows:
S1 excavates place: a regular a length of L is excavated on experimental site1, width D1, depth H1Cuboid hole,
Cuboid hole is to simulate 4 supporting beam demolition blasting of deep basal pit to the main place for retaining structure influence experiment；
S2, casting concrete: it is d that the inner wall in hole, which pours thickness,1Concrete, which is known as peripheral concrete 1,
Protection 4 crater wall of deep basal pit rule is primarily served, prevents peripheral counter-force steelframe 2 from generating large deformation；
S3, welding steel structure: adding a thickness again in 1 inner wall of peripheral concrete is d2Steel plate, by the steel plate of inner wall surrounding
It welds two-by-two, for the steel plate combination after welding at a steelframe, which is known as peripheral counter-force steelframe 2, applies equivalent soil subsequent
It is provided when compressive load and stablizes counter-force, and play the role of fixedly separated formula hydraulic jack 5；
S4, builds and form removal 11: template 11 is built in the inside of peripheral counter-force steelframe 2, pours reality in template 11
4 outer wall of deep basal pit wanted is tested, length and width determine that the position of 4 crater wall of deep basal pit should be protected by the theory of similarity according to Practical Project size
Two adjacent surfaces of foundation pit outer wall and two adjacent surfaces of peripheral 2 inner wall of counter-force steelframe are demonstrate,proved close to and vacating width is d3Hole,
It is d that another two adjacent surface of the inner wall of the another two adjacent surface of foundation pit outer wall and peripheral counter-force steelframe 2, which reserves width,4Hole, it is wide
Degree is d3Hole in for loading sandy soil 3, width d4Hole for installing the equivalent bringing device of soil stress, in the device
Comprising separated type hydraulic jack 5 and posting steel plate 6, template 11 of dismantling in time after the above concrete formation；
S5, supporting beam pour: the casting method of supporting beam is with Practical Project on the contrary, passing through concrete in deep basal pit 4
Pour that stake pours and sandy soil 3 install support plate 10, the installation template 11 on the basis of support plate 10, then pass through in template 11
Concrete casting column 9 pours and sandy soil 3 install support plate 10, is supported pouring for plate 10 one by one bottom-up to realize
It builds.
Production method of the present invention is simple, can be put into reinforcing bar or steel wire in foundation pit walls in proportion, greatly improves whole consolidate
Property, having width between posting steel plate 6 and foundation pit is d3Hole, which is also used for filling sandy soil 3, and four separation type hydraulics are very heavy
Top 5 is withstood at equal intervals between posting steel plate 6 and peripheral counter-force steelframe 2, and four separated type hydraulic jacks 5 pass through hydraulic oil pipe 8
It drags four hydraulic power units 7 to connect with electric synchronous one, enables the support force between posting steel plate 6 and peripheral counter-force steelframe 2 uniform
Distribution, improves enabling capabilities, and the crater wall of deep basal pit 4 is diaphram wall or pours stake.
In the present invention, Practical Project can be simplified to experimental model by the law of similitude, consider soil pressure masterpiece in an experiment
With, explosive load percussion, and provide the pouring molding method of foundation pit and supporting beam in sample model, more safety and firmness.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of simulation Brace in Deep Footing Groove beam demolition blasting is on the experimental method for retaining structure influence, which is characterized in that experiment institute
Needing equipment includes that separated type hydraulic jack (5), electric synchronous one drag four hydraulic power units (7), hydraulic oil pipe (8), posting steel plate
(6), concrete, reinforcing bar, peripheral counter-force steelframe (2), sandy soil (3), specific steps are as follows:
S1 excavates place: a regular a length of L is excavated on experimental site1, width D1, depth H1Cuboid hole, the length
Cube hole is to simulate deep basal pit (4) supporting beam demolition blasting to the main place for retaining structure influence experiment；
S2, casting concrete: pouring thickness in deep basal pit (4) inner wall is d1Concrete, which is known as peripheral concrete
(1), protection deep basal pit (4) crater wall rule is primarily served；
S3, welding steel structure: adding a thickness again in 1 inner wall of peripheral concrete is d2Steel plate, the steel plate of inner wall surrounding is welded two-by-two
It connects, for the steel plate combination after welding at a steelframe, which is known as peripheral counter-force steelframe (2), and peripheral concrete (1) prevents periphery
Counter-force steelframe (2) generates large deformation, provides in the equivalent soil pressure load of subsequent application and stablizes counter-force, and plays fixedly separated formula
The effect of hydraulic jack (5)；
S4, builds and form removal (11): template (11) are built in the inside of peripheral counter-force steelframe (2), pour in template (11)
Desired deep basal pit (4) outer wall of experiment is built, length and width are determined according to Practical Project size by the theory of similarity, deep basal pit (4) wall
Position should ensure that deep basal pit (4) outer wall two adjacent surfaces and peripheral counter-force steelframe (2) inner wall two adjacent surfaces close to and vacating width
Degree is d3Hole, in another two adjacent surface of the inner wall of the another two adjacent surface and peripheral counter-force steelframe (2) of deep basal pit (4) outer wall
Reserving width is d4Hole, width d3Hole in for loading sandy soil (3), width d4Hole answer for installing soil
Power equivalent bringing device includes separated type hydraulic jack (5) and posting steel plate (6) in the device, in the above concrete formation
Template of dismantling in time afterwards (11)；
S5, supporting beam pour: the casting method of supporting beam is with Practical Project on the contrary, being poured in deep basal pit (4) by concrete
It builds stake to pour and sandy soil (3) installation support plate (10), the installation template (11) on the basis of support plate (10), then in template
(11) it is poured on by concrete casting column (9) and sandy soil (3) installs support plate (10), to realize bottom-up one by one
It is supported pouring for plate (10).
2. a kind of simulation Brace in Deep Footing Groove beam demolition blasting according to claim 1 is on the experiment side for retaining structure influence
Method, which is characterized in that reinforcing bar or steel wire can be put into proportion in deep basal pit (4) crater wall.
3. a kind of simulation Brace in Deep Footing Groove beam demolition blasting according to claim 1 is on the experiment side for retaining structure influence
Method, which is characterized in that having width between the posting steel plate (6) and foundation pit is d3Hole, the hole be also used for filling sandy soil
(3)。
4. a kind of simulation Brace in Deep Footing Groove beam demolition blasting according to claim 1 is on the experiment side for retaining structure influence
Method, which is characterized in that four separated type hydraulic jacks (5) withstand on posting steel plate (6) and peripheral counter-force steel at equal intervals
Between frame (2), four separated type hydraulic jacks (5) drag four hydraulic power units (7) by hydraulic oil pipe (8) and electric synchronous one
Connection.
5. a kind of experiment side that simulation Brace in Deep Footing Groove beam demolition blasting influences reservation structure according to claim S4
Method, which is characterized in that the crater wall of the deep basal pit (4) is diaphram wall or pours stake.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910351505.5A CN110029693B (en) | 2019-04-28 | 2019-04-28 | Experimental method for simulating influence of blasting demolition of deep foundation pit support beam on reserved structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910351505.5A CN110029693B (en) | 2019-04-28 | 2019-04-28 | Experimental method for simulating influence of blasting demolition of deep foundation pit support beam on reserved structure |
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| CN110029693A true CN110029693A (en) | 2019-07-19 |
| CN110029693B CN110029693B (en) | 2020-10-30 |
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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 |
-
2019
- 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 |
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| 钟冬望等: "武汉某深基坑支撑梁爆破拆除顺序研究 ", 《爆破》 * |
| 高岳等: "丰满扩建永庆反调节水库混凝土围堰爆破拆除试验 ", 《东北水利水电》 * |
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