CN116641397A - Concrete axial force servo supporting system capable of actively controlling deformation - Google Patents
Concrete axial force servo supporting system capable of actively controlling deformation Download PDFInfo
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- CN116641397A CN116641397A CN202310754744.1A CN202310754744A CN116641397A CN 116641397 A CN116641397 A CN 116641397A CN 202310754744 A CN202310754744 A CN 202310754744A CN 116641397 A CN116641397 A CN 116641397A
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- 239000004567 concrete Substances 0.000 title claims abstract description 23
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 98
- 238000010276 construction Methods 0.000 claims abstract description 17
- 230000002093 peripheral effect Effects 0.000 claims abstract description 11
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000002689 soil Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000009412 basement excavation Methods 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract 1
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000009295 sperm incapacitation Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention belongs to a concrete axial force servo support system capable of actively controlling deformation in the field of building foundation pit support, which comprises the following technical scheme: the first side enclosure of the peripheral enclosure, the longitudinal reinforced concrete support of the reinforced concrete support and the first reinforced concrete purlin of the reinforced concrete enclosure are positioned on the side with high environmental protection requirement; a loading end is arranged on one side of the longitudinal reinforced concrete support, and a first structural joint is arranged between the loading end and the first reinforced concrete purlin, so that the loading end becomes a cantilever span; the loading end is provided with a groove; a hydraulic jack is arranged in the groove, and axial force towards the outer direction of the pit is applied to the first reinforced concrete purlin in real time at the end part of the longitudinal reinforced concrete support according to the deformation control requirement of the foundation pit; a second construction joint is arranged between the first reinforced concrete purlin and a second reinforced concrete surrounding purlin intersected with the first reinforced concrete purlin. The technology effectively fuses the reinforced concrete support system and the axial force servo system, simultaneously plays the advantages of the reinforced concrete support system and the axial force servo system, and simply and effectively solves the problem of foundation pit excavation deformation in a high-environment protection area, thereby achieving the purposes of reducing soil disturbance, expanding the application range, effectively controlling deformation and saving energy with low carbon.
Description
Technical Field
The invention belongs to the field of building foundation pit support, and particularly relates to a support system for actively controlling deformation of a foundation pit in an excavation stage so as to achieve a sensitive environment protection effect, which can be widely applied to foundation pit engineering with higher protection requirement environments around.
Background
Since the middle 90 s of the 20 th century, china formally enters the urban underground space development and utilization era, and the construction of high-rise building basements, underground malls, underground parking lots, large subway stations, underground substations and the like caused by large-scale underground space development is accompanied by the generation of a large number of deep foundation pit projects; and the foundation pit is bigger and bigger in scale and deeper in excavation depth. Especially after 21 st century, with the further popularization of rail traffic facilities, the further implementation of urban main municipal pipeline on-site engineering, further promulgation of historical protection buildings are clear, and important buildings such as hospitals, schools, houses, precision equipment factories and the like are further emphasized, foundation pit engineering close to the objects is required to execute stricter deformation control indexes in the implementation process, and the objects are seriously forbidden to generate larger sedimentation deformation, even damage and incapacitation due to the earth excavation and unloading operations in the foundation pit. According to foundation pit engineering technical standard DG/TJ08-61-2018 of Shanghai city engineering construction specifications, the environmental protection of foundation pit engineering is divided into a first stage, a second stage and a third stage from high to low.
At present, in order to meet deformation control indexes of primary and secondary foundation pit engineering with high environmental protection, the technical measures adopted in the design and construction are as follows: a) The cross section size of the members of the peripheral enclosing body is increased to improve the bending rigidity of the peripheral enclosing body, so that the enclosing body is less deformed under the condition of bearing the same out-of-pit load and action; b) A large-area foundation is arranged in the soil body of the passive area inside the foundation pit for reinforcement, namely: injecting the solidified slurry into soil gaps by utilizing hydraulic, pneumatic or chemical principles, and cementing original loose soil particles or cracks into a whole, or taking cement as a main agent of a solidifying agent, hardening soft soil into a pile body with integrity, water stability and certain strength by a special deep stirring machine, finally improving the bearing capacity of a foundation, and improving the strength and deformation property of the soil body so as to achieve the purpose of reducing the deformation of a foundation pit enclosure; c) When the foundation pit engineering area is large or the shape is irregular, the original foundation pit engineering is divided into a plurality of small partition foundation pits by arranging the internal temporary partition enclosure body, the small partition foundation pits close to the sensitive environment are constructed finally by utilizing the space-time effect principle, and measures such as a servo axial force automatic compensation system steel support are taken, so that the deformation of the enclosure body at the sensitive environment side is controlled. All three measures increase the construction cost of the project due to the fact that a large amount of foundation construction contents are increased to different degrees, and the economic benefit of the construction project is not facilitated; meanwhile, the use of a larger amount of materials such as reinforcing steel bars, cement and the like and the discharge of slurry are contrary to the environment-friendly idea.
Disclosure of Invention
In order to solve the technical problems, the invention provides the concrete axial force servo supporting system capable of actively controlling deformation, which fully combines the deformation control actions of the concrete support with high rigidity and the axial force servo, and simply and effectively solves the problem of foundation pit excavation deformation in a high-environment protection area.
The technical scheme of the invention is as follows: the concrete axial force servo support system capable of actively controlling deformation is characterized in that the periphery of a foundation pit is provided with a peripheral enclosing body, and the inside of the foundation pit is provided with a support frame consisting of reinforced concrete enclosing purlins, reinforced concrete supports which are vertically and horizontally intersected and steel upright posts; the first side enclosure of the peripheral enclosure, the longitudinal reinforced concrete support of the reinforced concrete support and the first reinforced concrete purlin of the reinforced concrete enclosure are positioned on the side with high environmental protection requirement; a loading end is arranged on one side of the longitudinal reinforced concrete support, and a first structural joint is arranged between the loading end and the first reinforced concrete purlin, so that the loading end becomes a cantilever span; the loading end is provided with a groove; a hydraulic jack is arranged in the groove, and axial force towards the outer direction of the pit is applied to the first reinforced concrete purlin in real time at the end part of the longitudinal reinforced concrete support according to the deformation control requirement of the foundation pit; a second construction joint is arranged between the first reinforced concrete purlin and a second reinforced concrete surrounding purlin intersected with the first reinforced concrete purlin.
Based on the technical characteristics: the span of the cantilever span is smaller than the non-cantilever span of the support frame.
Based on the technical characteristics: inclined pull rods are arranged on two sides of the end span steel upright post of the cantilever span, and the loading end and the longitudinal reinforced concrete support are respectively tied.
Based on the technical characteristics: the reinforced loading end adopts a haunching structure at the joint of the longitudinal reinforced concrete support and the first reinforced concrete purlin; the net section width of the solid end of the loading end is determined according to the principle that the section compressive bearing capacity is not lower than the longitudinal reinforced concrete supporting section compressive bearing capacity.
Based on the technical characteristics: and a thin steel plate or pouring high-strength grouting material is arranged in a gap between the solid end and the first reinforced concrete purlin.
Based on the technical characteristics: the included angle between the haunching inclined plane and the central axis of the longitudinal reinforced concrete support is not more than 30 degrees.
Based on the technical characteristics: the groove is opened in the middle of the loading end.
Based on the technical characteristics: the grooves are two, and are respectively arranged at two sides of the loading end.
Based on the technical characteristics: the bottom of the groove is provided with a reinforced concrete supporting plate, and the thickness of the reinforced concrete supporting plate is not less than 150mm.
Based on the technical characteristics: and connecting steel bars are arranged between the first reinforced concrete purlin and the first side enclosure body to form integral connection.
Based on the technical characteristics: the splayed support is arranged at the end part of the transverse reinforced concrete support corresponding to the second construction joint.
The basic idea of the invention is: the reinforced concrete support has the advantages of large rigidity in a plane and small limitation on arrangement form. Applying axial force on the steel support actively controls the deformation but the arrangement is more limited. The invention can exert the advantages of the two, and is suitable for deep foundation pit engineering with various shapes and areas.
Firstly, a reinforced concrete support is formed, then a jack is arranged between the end part of the first reinforced concrete support on the side with higher environmental protection requirement and the first reinforced concrete purlin, and axial force is applied by the jack, so that the enclosure structure deforms outwards of the pit, and the foundation pit and the surrounding environment are controlled in millimeter level. The support system is suitable for a purlin enclosing system, and the purlin enclosing system is suitable for discrete peripheral enclosing bodies, such as filling row piles, occluding piles, SMW construction method piles and the like; the method is also suitable for continuous peripheral enclosures such as underground continuous walls and the like. The concrete supporting and loading end of the corresponding side span is provided with the haunching structure, so that the jack is convenient to install, the force transmission reliability and the stress balance are ensured, and a steel plate or pouring grouting material is timely inserted into a gap between the jacked loading end and the enclosing purlin, so that the dual storage of the pressure maintaining function and the bearing capacity is realized.
Through the targeted design adjustment to the reinforced concrete supporting system, the reinforced concrete supporting system and the hydraulic jack axial force servo system are effectively fused, and meanwhile, the advantages of the reinforced concrete supporting system and the hydraulic jack axial force servo system are exerted. The application range is enlarged, the method is used for deep foundation pits with different shapes and areas, the displacement of the enclosure body on the side of the protection environment can be effectively controlled, and the low carbon, energy conservation and emission reduction are realized due to the reduction of the construction content of the foundation pit.
Drawings
FIG. 1 is a plan view of an actively controllable deformed concrete axial force servo support system.
FIG. 2 is a cross-sectional view of an actively controllable deformed concrete axial force servo support system.
Fig. 3 is a detailed view of a first loading end of an actively controllable deformed concrete axial force servo support system.
Fig. 4 is a detailed view of a second loading end of the actively controllable deformed concrete axial force servo support system.
FIG. 5 is a detailed cross-sectional view of the loading end of an actively controllable deformed concrete axial force servo support system.
The component numbers in the figure are: a first side enclosure 1; a longitudinal reinforced concrete support 2; a transverse reinforced concrete support 3; a loading end 4; a first loading end 41; a second loading end 42; a first reinforced concrete purlin 6; a groove 7; a hydraulic jack 8; a first structural seam 9; a second structural seam 10; end span steel upright 11; a diagonal draw bar 12; a first embedment 13; a second embedment 14; connecting steel bars 15; splayed struts 16; a second reinforced concrete purlin 17; a first solid end 18; a second solid end 19; a reinforced concrete pallet 20.
Description of the embodiments
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and are not intended to be limiting.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The invention effectively fuses the reinforced concrete support and the axial force servo system, and simultaneously plays the advantages of the reinforced concrete support and the axial force servo system. Thereby achieving the aims of reducing soil disturbance, expanding the application range, effectively controlling deformation and saving energy with low carbon. The specific description below refers to the accompanying drawings:
as shown in fig. 1 to 5, the periphery of the foundation pit is a peripheral enclosure body, and the inside is a supporting frame consisting of reinforced concrete purlins, reinforced concrete supports which are vertically and horizontally intersected and steel columns. The first side enclosure 1 of the peripheral enclosure, the longitudinal reinforced concrete support 2 of the reinforced concrete support and the first reinforced concrete purlin edge 6 of the reinforced concrete enclosure purlin are positioned on the side with high environmental protection requirements.
One side of the longitudinal reinforced concrete support 2 is provided with a loading end 4, and a first construction joint 9 is arranged between the loading end 4 and the first reinforced concrete purlin 6, so that the loading end 4 becomes a cantilever span. The loading end 4 is provided with a groove 7; the hydraulic jack 8 is arranged in the groove 7, and the axial force in the direction outside the pit is applied to the first reinforced concrete purlin 6 in real time at the end part of the longitudinal reinforced concrete support 2 according to the deformation control requirement of the foundation pit, so that the effects of controlling the deformation of the foundation pit and protecting the surrounding environment are realized. A second construction joint 10 is provided between the first reinforced concrete purlin 6 and a second reinforced concrete purlin 17 that intersects the first reinforced concrete purlin. A splayed brace 16 is provided corresponding to the end of the transverse reinforced concrete support 3 adjacent the second structural seam 10 to control the cantilever span of the second reinforced concrete purlin edge 17.
The recess 7 may open in the middle of the loading end as shown in the first loading end 41.
The number of grooves 7 may be two, one on each side of the loading end, as shown by the second loading end 42.
In order to strengthen the connection between the hydraulic jack 8 and the longitudinal reinforced concrete support 2, a first loading end 41 or a second loading end 42 with a haunching structure is adopted at the connection, and the hydraulic jack 8 is arranged in a groove 7 in the middle of the first loading end 4 or in grooves 7 on two sides of the second loading end 42. The bottom of the groove 7 is provided with a reinforced concrete supporting plate 20, and the thickness is not less than 150mm.
As shown in fig. 3, the net cross-sectional width of the first solid end 18 of the first loading end 41, excluding the recess portion, is determined according to the principle that the cross-sectional compressive load capacity is not lower than that of the longitudinal reinforced concrete support 2, and the net cross-sectional width of the first solid end 18 is the sum of the dimensions a in fig. 3.
As shown in fig. 4, the net cross-sectional width C of the second solid end 19 of the second loading end 42, minus the groove portions, is determined in accordance with the principle that the cross-sectional compressive load capacity is not lower than that of the longitudinal reinforced concrete support 2.
As shown in fig. 3 and 4, in order to improve the stress state of the haunching structure, the included angle alpha between the haunching inclined plane and the central axis of the longitudinal reinforced concrete support 2 is not more than 30 degrees.
The gaps between the first solid end 18 and the second solid end 19 and the first reinforced concrete purlin 6 are provided with thin steel plates or high-strength grouting materials are poured to serve as pressure maintaining and bearing capacity dual storage.
As shown in fig. 5, a first embedded part 13 is arranged on the first reinforced concrete purlin 6 corresponding to the action of the hydraulic jack 8, and a second embedded part 14 is arranged on the loading end corresponding to the action of the hydraulic jack 8.
In order to control the stress and deformation of the loading end 4 in a cantilever state, the distance between the end span steel upright post 11 and the first reinforced concrete purlin 6 is smaller in span, and the rest span column distances are still conventional spans; i.e. the span E of the cantilever span is smaller than the non-cantilever span F of the support frame. And after the hydraulic jack is installed, the loading end 4 and the longitudinal reinforced concrete support 2 are tied by diagonal rods 12 on two sides of the end span steel upright post 11 before the foundation pit continues to excavate downwards.
As shown in fig. 5, a connecting steel bar 15 is arranged between the first reinforced concrete purlin 6 and the first side enclosure 1, so that the first reinforced concrete purlin and the first side enclosure 1 form integral connection. The connecting bars 15 may be replaced with conventional hanger bars or the connecting bars 15 may be used simultaneously with the hanger bars.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (11)
1. The concrete axial force servo support system capable of actively controlling deformation is characterized in that the periphery of a foundation pit is provided with a peripheral enclosing body, and the inside of the foundation pit is provided with a support frame consisting of reinforced concrete enclosing purlins, reinforced concrete supports which are vertically and horizontally intersected and steel upright posts; the method is characterized in that: the first side enclosure body (1) of the peripheral enclosure body, the longitudinal reinforced concrete support (2) of the reinforced concrete support and the first reinforced concrete purlin edge (6) of the reinforced concrete enclosure purlin are positioned at the high side of the environmental protection requirement; a loading end (4) is arranged on one side of the longitudinal reinforced concrete support (2), and a first construction joint (9) is arranged between the loading end (4) and the first reinforced concrete purlin (6) so that the loading end (4) is a cantilever span; the loading end (4) is provided with a groove (7); a hydraulic jack (8) is arranged in the groove (7), and axial force towards the outer direction of the pit is applied to the first reinforced concrete purlin (6) at the end part of the longitudinal reinforced concrete support (2) in real time according to the deformation control requirement of the foundation pit; and a second construction joint (10) is arranged between the first reinforced concrete purlin (6) and a second reinforced concrete surrounding purlin (17) intersected with the first reinforced concrete purlin.
2. The actively controllable deformed concrete axial force servo support system of claim 1, wherein: the cantilever span (E) is smaller than the non-cantilever span (F) of the support frame.
3. An actively controllable deformed concrete axial force servo support system according to claim 2, wherein: inclined pull rods (12) are arranged on two sides of an end span steel upright post (11) of the cantilever span, and the loading end (4) and the longitudinal reinforced concrete support (2) are respectively tied.
4. The actively controlled deformable concrete axial force servo support system of claim 1 wherein said load end (4) is reinforced with a haunched construction at the junction of said longitudinal reinforced concrete support (2) and said first reinforced concrete purlin edge (6); the net section width of the solid end of the loading end (4) is determined according to the principle that the section compressive bearing capacity is not lower than that of the longitudinal reinforced concrete support (2).
5. The actively controllable deformed concrete axial force servo supporting system of claim 4, wherein a gap between said solid end and said first reinforced concrete purlin (6) is provided with a thin steel plate or a high-strength grouting material is poured.
6. The concrete axial force servo supporting system capable of actively controlling deformation according to claim 4, wherein an included angle between an axillary inclined plane and a central axis of the longitudinal reinforced concrete support (2) is formedα) No greater than 30 deg..
7. The actively controllable deformed concrete axial force servo support system of claim 1, wherein: the groove (7) is formed in the middle of the loading end (4).
8. The actively controllable deformed concrete axial force servo support system of claim 1, wherein: the number of the grooves (7) is two, and the grooves are respectively arranged at two sides of the loading end (4).
9. The actively controllable deformed concrete axial force servo supporting system of claim 1, wherein the reinforced concrete supporting plate (20) is arranged at the bottom of the groove (7) and has a thickness not smaller than 150mm.
10. The concrete axial force servo supporting system capable of actively controlling deformation according to claim 1, wherein connecting steel bars (15) are arranged between the first reinforced concrete purlin (6) and the first side enclosure body (1) to form integral connection.
11. An actively controllable deformed concrete axial force servo support system according to claim 1, characterized in that a splay brace (16) is arranged in correspondence of the end of the transverse reinforced concrete support (3) at the second construction joint (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310754744.1A CN116641397A (en) | 2023-06-26 | 2023-06-26 | Concrete axial force servo supporting system capable of actively controlling deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310754744.1A CN116641397A (en) | 2023-06-26 | 2023-06-26 | Concrete axial force servo supporting system capable of actively controlling deformation |
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| Publication Number | Publication Date |
|---|---|
| CN116641397A true CN116641397A (en) | 2023-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310754744.1A Pending CN116641397A (en) | 2023-06-26 | 2023-06-26 | Concrete axial force servo supporting system capable of actively controlling deformation |
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| Country | Link |
|---|---|
| CN (1) | CN116641397A (en) |
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2023
- 2023-06-26 CN CN202310754744.1A patent/CN116641397A/en active Pending
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