CN210104759U - Anti type underground structure that floats - Google Patents
Anti type underground structure that floats Download PDFInfo
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- CN210104759U CN210104759U CN201920673253.3U CN201920673253U CN210104759U CN 210104759 U CN210104759 U CN 210104759U CN 201920673253 U CN201920673253 U CN 201920673253U CN 210104759 U CN210104759 U CN 210104759U
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Abstract
The utility model discloses an anti type underground structure that floats relates to underground structure and struts technical field, has solved the underground structure and has set up respectively with anti superficial structure, and the back is backfilled to the fertile groove, and supporting construction loses effect, extravagant problem of a large amount of engineering resources, and its technical scheme main points are: the supporting pile is abutted or close to the soil body on the side wall of the foundation pit, and the bottom end of the supporting pile is embedded into the bottom of the foundation pit; the supporting piles are fixedly connected with anchor cables, and anchoring ends of the anchor cables are obliquely and downwards arranged in soil bodies on the side walls of the foundation pit; an underground structure bottom plate and at least one layer of underground structure beam plate are horizontally arranged above the bottom of the foundation pit, and the underground structure beam plate is positioned above the underground structure bottom plate; the top surface of the topmost underground structure beam plate is provided with a coping crown beam; the upper surface of underground structure bottom plate and underground structure beam slab all contradicts and is equipped with the roof beam that shears, has and bears the whole or partial groundwater of load and to the buoyancy load that underground structure produced behind temporary support structure and the underground structure connection, makes temporary support structure exert the effect of permanent anti-floating effect.
Description
Technical Field
The utility model relates to a foundation ditch support technical field, more specifically says, it relates to anti type underground structure that floats.
Background
In the building engineering industry, the foundation pit support is a retaining, reinforcing and protecting measure which is adopted for the soil body on the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit.
In the existing foundation pit support, usually, a foundation pit support pile and an anti-floating structure are respectively arranged, and after a fertilizer tank is backfilled, the support structure loses the functions and the effects, and the anti-floating structure needs to be independently designed and independently implemented no matter what anti-floating measures are adopted. For engineering construction, the supporting structure arranged temporarily has a certain embedding depth (below the bottom of the foundation pit) and is in certain contact with the soil body on the side wall of the foundation pit, and particularly the supporting structure provided with the anchor cable has stronger anti-pulling capacity, so that the supporting structure cannot be reused to cause great engineering waste.
Therefore, how to design an anti-floating foundation pit supporting structure is a problem which needs to be solved urgently at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an anti-floating type underground structure has the resistance to plucking ability that combines the tensile ability and the anchor rope anchor of fender pile self, and the buoyancy load that bearing arm is whole or partial groundwater produced underground structure after being connected temporary support structure and underground structure makes temporary support structure exert the effect of permanent anti-floating effect.
The above technical purpose of the present invention can be achieved by the following technical solutions: the anti-floating foundation pit supporting structure comprises supporting piles abutted against or close to the soil body on the side wall of the foundation pit, wherein the bottom ends of the supporting piles are embedded below the bottom of the foundation pit; the supporting piles are fixedly connected with anchor cables, and anchoring ends of the anchor cables are obliquely and downwards arranged in soil bodies on the side walls of the foundation pit; an underground structure bottom plate and at least one layer of underground structure beam plate which are fixedly connected with the side wall of the support pile are horizontally arranged above the bottom of the foundation pit, and the underground structure beam plate is positioned above the underground structure bottom plate; the top pressing crown beam is arranged on the upper surface of the topmost underground structure beam plate; the upper surfaces of the underground structure bottom plate and the rest underground structure beam plates are all abutted with shear-resistant beams fixedly connected with the side walls of the support piles.
By adopting the technical scheme, the underground structure bottom plate and the underground structure beam plate are connected with the supporting piles, so that the temporary supporting structure is convenient to bear the buoyancy load of all or part of underground water on the underground structure after being connected with the underground structure, the temporary supporting structure plays a permanent anti-floating role, the engineering waste in the building engineering is reduced, and the investment cost of the building engineering is saved.
The utility model discloses further set up to: the end parts of the underground structure bottom plate and the underground structure beam plate are rigidly connected with the side wall of the supporting pile through embedded bars.
Through adopting above-mentioned technical scheme, be convenient for improve the joint strength between underground structure bottom plate and the underground structure beam slab and the fender pile, promote the performance that the fender pile undertakes the buoyancy load of underground structure.
The utility model discloses further set up to: and an underground structure outer wall structure which is vertically fixed with the underground structure bottom plate and the underground structure beam plate is arranged above the bottom of the foundation pit.
By adopting the technical scheme, the curvature of the underground structure bottom plate and the underground structure beam plate can be reduced conveniently by utilizing the underground structure outer wall structure.
The utility model discloses further set up to: the vertical height of the anchor end of the anchor cable is larger than or equal to that of the underground structure beam plate, and the connecting end of the anchor cable penetrates through the support pile and then is fixedly connected with the shear beam.
By adopting the technical scheme, the anchor cable is simple to fix and operate.
To sum up, the utility model discloses following beneficial effect has: the underground structure bottom plate and the underground structure beam plate are connected with the supporting piles, so that the temporary supporting structure and the underground structure can be conveniently connected to bear the buoyancy load of all or part of underground water on the underground structure, the temporary supporting structure can play a permanent anti-floating role, the engineering waste in the building engineering is reduced, and the investment cost of the building engineering is saved; the embedded parts are utilized, so that the connection operation of the underground structure outer wall structure, the underground structure bottom plate and the underground structure beam plate is convenient; the stress of the parts of the support piles positioned on the two sides of the beam plate of the underground structure is distributed more evenly.
Drawings
Fig. 1 is a schematic view of the overall structure in an embodiment of the present invention;
fig. 2 is a block flow diagram in an embodiment of the invention.
In the figure: 1. a foundation pit side wall soil body; 2. supporting piles; 3. an anchor cable; 4. the bottom of the foundation pit; 5. an underground structural floor; 6. an underground structural beam slab; 7. an underground structure exterior wall structure; 8. a shear beam; 9. and pressing the top beam.
Detailed Description
The present invention will be described in further detail with reference to the accompanying fig. 1-2.
Example (b): an anti-floating foundation pit supporting structure is shown in figure 1 and comprises supporting piles 2 which are abutted or closely adjacent to a foundation pit side wall soil body 1, and the bottom ends of the supporting piles 2 are embedded below the bottom 4 of a foundation pit. The support piles 2 are fixedly connected with anchor cables 3, anchoring ends of which are obliquely and downwards arranged in the soil body 1 on the side wall of the foundation pit. The underground structure bottom plate 5 and the at least one layer of underground structure beam slab 6 that all with 2 lateral walls fixed connection of fender pile are provided with to 4 top levels in foundation ditch bottom, and underground structure beam slab 6 is located 5 tops of underground structure bottom plate. In this embodiment, the underground structural beam slab 6 is formed of two layers. The upper surface of the topmost underground structural beam plate 6 is provided with a coping crown beam 9. The upper surfaces of the underground structure bottom plate 5 and the rest underground structure beam plates 6 are respectively provided with a shear beam 8 which is fixedly connected with the side wall of the support pile 2 in a butting manner. Utilize underground structure bottom plate 5 and underground structure beam slab 6 to be connected with fender pile 2, be convenient for with the buoyancy load of bearing the whole or partial groundwater of temporary support structure and underground structure connection back to the underground structure production, make temporary support structure play permanent anti-floating effect, reduce the engineering waste in the building engineering, practiced thrift building engineering's input cost.
In the embodiment, an underground structure outer wall structure 7 which is vertically fixed with an underground structure bottom plate 5 and an underground structure beam plate 6 is arranged above the bottom part 4 of the foundation pit. By utilizing the underground structure outer wall structure 7, the bending degree of the underground structure bottom plate 5 and the underground structure beam plate 6 is convenient to reduce. In addition, underground structure bottom plate 5 and underground structure beam slab 6's tip and the connection of the 2 lateral walls of fender pile still can form rigid connection through the bar planting, are convenient for improve the joint strength between underground structure bottom plate 5 and underground structure beam slab 6 and the fender pile 2, promote the performance that the buoyancy load of underground structure is undertaken to fender pile 2.
The vertical height of the anchoring end of the anchor cable 3 is larger than or equal to that of the underground structure beam plate 6, and the connecting end of the anchor cable 3 penetrates through the support pile 2 and then is fixedly connected with the shear beam 8, so that the fixing operation of the anchor cable 3 is simple. In this embodiment, the vertical height of the anchoring end of the anchor cable 3 is greater than the vertical height of the foundation pit bottom 4.
The construction method of the anti-floating foundation pit supporting structure, as shown in fig. 1 and 2, comprises the following steps:
and S1, arranging the support pile 2 according to the standard of foundation pit support engineering, and carrying out checking calculation on the working condition of bearing the buoyancy action on the anti-pulling bearing capacity of the pile body of the support pile 2.
And step S2, placing the anchoring end of the anchor cable 3 into the foundation pit side wall soil body 1 for fixing, then fixing the connecting end of the anchor cable 3 after penetrating through the support pile 2, and checking and calculating the pulling resistance of the anchor cable 3 under the action of the pulling-down component.
Step S3, sequentially arranging an underground structure bottom plate 5 and an underground structure beam plate 6 at the bottom 4 of the foundation pit from bottom to top, then arranging a shear beam 8 above the underground structure bottom plate 5 and the underground structure beam plate 6 on the support pile 2, and checking the vertical shear capacity of the shear beam 8 under the action of buoyancy.
And step S4, calculating the total buoyancy load which can be borne by the supporting structure according to the checking results in the step S1, the step S2 and the step S3, and checking the stability of the underground structure according to the total buoyancy load.
In step S1, the pile body pulling-resistant bearing capacity of the support pile 2 satisfies formula (1):
N0≤ASfy(1)
in the formula (1), N0The design value of the tensile bearing capacity of the pile body of the support pile 2 is expressed in kN; a. theSThe total area of longitudinal reinforcing bars of the support pile 2 is in mm2；fyIs a standard value of the strength of the steel bar, and the unit is kPa;
the pile body pulling-resistant bearing capacity of the support pile 2 meets the following formula (2):
in the formula (2), N1The resistance value of the top end of the foundation pit is KN; u is the length of 2 weeks of the support pile, and the unit is mm; l is1iThe vertical thickness from the top end of the support pile 2 to the bottom 4 of the foundation pit is m; l is2iThe unit is m, and the vertical thickness from the bottom end of the support pile 2 to the bottom 4 of the foundation pit is m; q. q.s1siIs equal to L1iThe corresponding soil layer side resistance strength is expressed in kPa; q. q.s2siIs equal to L2iThe corresponding soil layer side resistance strength is expressed in kPa;
in step S2, the tensile resistance of the anchor cable 3 satisfies formula (3):
N2＝T tanθ (3)
in the formula (3), N2Is vertical component force of the anchor cable 3, and the unit is KN; t is the pulling resistance of the anchor cable 3, and the unit is KN; theta is the degree of an included angle between the anchor cable 3 and a horizontal line, and the unit is degree;
in step 4, the total pullout resistance of the supporting structure satisfies formula (4):
N+N2≥Nf(4)
in the formula (4), N is the total uplift resistance of the supporting structure and the unit is N; n is a radical offIs the total buoyancy load in kN; wherein N is N0、N1Minimum value of (d); n is a radical off＝f*A0Wherein f is a buoyancy standard value per unit area, A0The area of the bottom plate of the underground structure surrounded by the supporting structure.
The working principle is as follows: utilize underground structure bottom plate 5 and underground structure beam slab 6 to be connected with fender pile 2, be convenient for with the buoyancy load of bearing the whole or partial groundwater of temporary support structure and underground structure connection back to the underground structure production, make temporary support structure play permanent anti-floating effect, reduce the engineering waste in the building engineering, practiced thrift building engineering's input cost.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.
Claims (4)
1. Anti type underground structure that floats, characterized by: the foundation pit supporting structure comprises supporting piles (2) which are abutted against or closely adjacent to a foundation pit side wall soil body (1), wherein the bottom ends of the supporting piles (2) are embedded below the bottom (4) of the foundation pit; the supporting piles (2) are fixedly connected with anchor cables (3) with anchoring ends obliquely and downwards arranged in a foundation pit side wall soil body (1); an underground structure bottom plate (5) and at least one layer of underground structure beam plate (6) which are fixedly connected with the side wall of the support pile (2) are horizontally arranged above the bottom (4) of the foundation pit, and the underground structure beam plate (6) is positioned above the underground structure bottom plate (5); the upper surface of the topmost underground structure beam plate (6) is provided with a coping crown beam (9); the upper surfaces of the underground structure bottom plate (5) and the rest underground structure beam plates (6) are respectively abutted with a shear beam (8) fixedly connected with the side wall of the support pile (2).
2. The anti-floating foundation pit supporting structure according to claim 1, wherein: the end parts of the underground structure bottom plate (5) and the underground structure beam plate (6) are rigidly connected with the side wall of the support pile (2) through embedded steel bars.
3. The anti-floating foundation pit supporting structure according to claim 1, wherein: and an underground structure outer wall structure (7) which is vertically fixed with the underground structure bottom plate (5) and the underground structure beam plate (6) is arranged above the foundation pit bottom (4).
4. The anti-floating foundation pit supporting structure according to claim 1, wherein: the vertical height of the anchoring end of the anchor cable (3) is larger than or equal to that of the underground structural beam plate (6), and the connecting end of the anchor cable (3) penetrates through the support pile (2) and then is fixedly connected with the shear beam (8).
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| CN201920673253.3U CN210104759U (en) | 2019-05-10 | 2019-05-10 | Anti type underground structure that floats |
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| CN201920673253.3U CN210104759U (en) | 2019-05-10 | 2019-05-10 | Anti type underground structure that floats |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067250A (en) * | 2019-05-10 | 2019-07-30 | 中国建筑西南勘察设计研究院有限公司 | Anti-floating type foundation pit supporting construction and construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110067250A (en) * | 2019-05-10 | 2019-07-30 | 中国建筑西南勘察设计研究院有限公司 | Anti-floating type foundation pit supporting construction and construction method |
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