CN109024711A - Underground structure anti-floating system and its construction method - Google Patents

Underground structure anti-floating system and its construction method Download PDF

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Publication number
CN109024711A
CN109024711A CN201810850209.5A CN201810850209A CN109024711A CN 109024711 A CN109024711 A CN 109024711A CN 201810850209 A CN201810850209 A CN 201810850209A CN 109024711 A CN109024711 A CN 109024711A
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China
Prior art keywords
foundation pit
underground structure
floating system
piles
fender pile
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CN201810850209.5A
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Chinese (zh)
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CN109024711B (en
Inventor
周芳
周曙东
陈家冬
尚学伟
周浩达
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Jiangsu Foundation Engineering Co Ltd
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Jiangsu Foundation Engineering Co Ltd
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Publication of CN109024711A publication Critical patent/CN109024711A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
    • E02D31/12Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure

Abstract

The invention discloses a kind of underground structure anti-floating system and its construction methods, it applies in underground structure field, its key points of the technical solution are that: including foundation pit, it further include several vertical fender piles along the setting of foundation pit periphery, each vertical fender pile is immediately adjacent to each other and forms protection piling wall, bottom of foundation ditch is embedded in the intracorporal slope bolt piles of soil equipped with several, and each slope bolt piles is arranged diagonally downward and one end is connected with vertical fender pile, and the one end of each slope bolt piles far from vertical fender pile extends in the middle part of foundation pit;What is had has the technical effect that the stability that underground structure can be enhanced, and improves the anti-floating performance of underground structure.

Description

Underground structure anti-floating system and its construction method
Technical field
The present invention relates to underground structure field, in particular to a kind of underground structure anti-floating system and its construction method.
Background technique
Preservation has a large amount of underground water in the gap of the soil body and the crack of rock mass, underground water to being embedded among Rock And Soil or On underground structure or hollow formula structure can generate uplift pressure, such as the underground structure being placed in foundation pit, if underground structure from Be less than that underground water generates it again to buoyancy when, arch or rising phenomenon will occur for underground structure, so that underground structure Cracking and infiltration occurs, influences the normal use of underground structure.
In recent years, high-rise, underground garage, sunk type square, subway and the underground quotient of basement are largely had The construction of the underground structures such as field, so that the anti-floating problem of underground structure seems very prominent.
Summary of the invention
The object of the present invention is to provide a kind of underground structure anti-floating systems, its advantage is that: the steady of underground structure can be enhanced It is qualitative, improve the anti-floating performance of underground structure.
Above-mentioned technical purpose of the invention has the technical scheme that a kind of underground structure anti-floating body System, including foundation pit, further include several vertical fender piles along the setting of foundation pit periphery, and each vertical fender pile is immediately adjacent to each other and is formed Protect piling wall, bottom of foundation ditch be equipped with it is several be embedded in the intracorporal slope bolt piles of soil, each slope bolt piles is arranged and one diagonally downward End is connected with vertical fender pile, and each one end of the slope bolt piles far from vertical fender pile extends in the middle part of foundation pit.
Through the above technical solutions, being embedded in the intracorporal slope bolt piles of soil can rely on when underground water generates buoyancy to foundation pit The soil body plays a grasp, to enhance the stability of foundation pit, improves the anti-floating performance of foundation pit;When the water level of underground water goes up When, underground water can play an impact force to slope bolt piles first, can be by this impact force since slope bolt piles is obliquely installed It conducts, be dispersed on vertical fender pile, to reduce underground water to foundation pit impact strength, further improve the stability of foundation pit.
The present invention is further arranged to: several vertical fender piles and slope bolt piles offer phase away from the side of foundation pit Intercommunicated diversion diversion trench, the foundation pit are externally provided with sump, pass through pressure-bearing pipe between the diversion diversion trench and sump Road connection.
Through the above technical solutions, underground water can pass through diversion in the presence of hydraulic pressure when the water level of underground water rises Diversion trench and bearing pipe are flow in sump, to reduce the moisture around foundation pit, and then are reduced underground water and are produced to foundation pit Raw buoyancy improves the stability of foundation pit.
The present invention is further arranged to: immersible pump is equipped in the sump, the water outlet of the immersible pump, which is connected with, to be prolonged Extend to the outlet pipe of ground off-balancesheet.
Through the above technical solutions, operator can star latent after underground water is flow in the presence of hydraulic pressure in sump Water pump, immersible pump extracts the water in sump out sump by outlet pipe, in order to the lasting stream of the underground water near foundation pit To sump, so that the moisture discharge being conducive to around foundation pit, reduces the water level line around foundation pit, floated suffered by foundation pit with reducing Power.
The present invention is further arranged to: several spheres are filled in the diversion diversion trench.
Through the above technical solutions, having gap can be each for Groundwater Flow to bearing pipe between each sphere Gap between a sphere is smaller, therefore a filtration can be played to underground water, reduces silt, rubble in underground water It is flowed into bearing pipe and sump along underground water, on the one hand can reduce the possibility of bearing pipe blocking, on the other hand Water resource can be saved consequently facilitating recycling underground water in order to operator's later purification, processing underground water.
The present invention is further arranged to: the bearing pipe is connected with protective net close to one end of diversion diversion trench, described The periphery of protective net is installed on bearing pipe inner wall, and the hole of the protective net is less than sphere.
Through the above technical solutions, protective net can prevent sphere from falling into bearing pipe in the presence of hydraulic pressure, thus It ensure that the stable operation of bearing pipe, and be conducive to the bearing pipe that operator uses Large Diameter Pipeline, guarantee bearing pipe Water inlet ability.
The present invention is further arranged to: the described one end of vertical fender pile far from slope bolt piles is equipped in the side away from foundation pit to be covered Plate, the cladding plate are arranged in the soil body.
Through the above technical solutions, when vertical fender pile and slope bolt piles are pressurized, power can be conducted by vertical fender pile to covering On plate, and cladding plate is arranged in the soil body, thus the soil body can to cladding plate generate a reaction force, thus reduce vertical fender pile with And slope bolt piles generates the possibility of inclination, deformation, dislocation under stress, improves the stability of vertical fender pile and slope bolt piles.
The present invention is further arranged to: the cladding plate is equipped with away from the side of slope bolt piles stablizes sink, and the outlet pipe is remote It is extended in stable sink from one end of immersible pump.
Through the above technical solutions, the underground water in sump is delivered in stable sink by immersible pump, thus originally The water that buoyancy can be generated to foundation pit be pumped down in stable sink, then play a downward pressure to cladding plate stablizing in sink Power substantially increases the stability of cladding plate, vertical fender pile and slope bolt piles, reduces cladding plate, vertical fender pile and slope bolt piles in pressure The lower possibility for generating inclination, deformation, dislocation, reasonable utilization underground water, also eliminate underground water should be transported to it is separate The energy consumed at foundation pit plays energy-efficient effect.
The present invention is further arranged to: the foundation pit inner wall be equipped with protective layer, the protective layer include high-density layer and Light layer, the foundation pit middle part arranged below is high-density layer, and the foundation pit middle part is above to be set as light layer.
Through the above technical solutions, arranged below in the middle part of foundation pit make more than high-density layer, foundation pit middle part to be set as light layer The position of centre of gravity of protective layer is lower, so that the center of gravity of foundation pit surrounding soil is located at foundation pit middle and lower part, it is well known that center of gravity Low structure can greatly improve the stability of structure, and then improve the anti-floating ability of foundation pit.
The present invention is further arranged to: buffer layer is equipped between the bottom of foundation ditch and slope bolt piles.
Through the above technical solutions, buffer layer can play one to slope bolt piles when slope bolt piles stress is deformed trend Buffer function, so that buffer layer can produce corresponding deformation and reduce slope bolt piles to foundation pit bottom even if slope bolt piles is bent upwards The possibility of portion's force reduces bottom of foundation ditch arch, curved possibility to ensure that the smooth of bottom of foundation ditch.
It is a further object to provide a kind of construction methods of above-mentioned underground structure anti-floating system, including following step It is rapid:
Step 1: excavating the soil body, forms foundation pit;
Step 2: several oblique pull holes towards in the middle part of foundation pit diagonally downward are drilled out along foundation pit periphery in bottom of foundation ditch, are then poured Concrete forms slope bolt piles;
Step 3: a layer soil body is backfilled to foundation pit inner sidewall, then several vertical holes is drilled out along foundation pit periphery and is poured concrete Form vertical fender pile.
Through the above technical solutions, operator can easily build out rapidly underground anti-floating system, to greatly reinforce The anti-floating ability of foundation pit improves safety of operator's later period when constructing in foundation pit.
In conclusion the invention has the following advantages:
1, when underground water generates buoyancy to foundation pit, being embedded in the intracorporal slope bolt piles of soil can rely on the soil body to play a grasp, To enhance the stability of foundation pit, the anti-floating performance of foundation pit is improved;
2, the water that can generate buoyancy to foundation pit originally is evacuated in stable sink by immersible pump, is then being stablized in sink to cladding plate The pressure downward to one substantially increases the stability of cladding plate, vertical fender pile and slope bolt piles, reduces cladding plate, vertical fender pile Generate the possibility of inclination, deformation, dislocation under stress with slope bolt piles, such reasonable utilization originally can generate buoyancy to foundation pit Underground water.
Detailed description of the invention
Fig. 1 is the overall structure diagram of embodiment 1;
Fig. 2 is the enlarged drawing in the portion A in Fig. 1.
Appended drawing reference: 1, foundation pit;2, vertical fender pile;3, slope bolt piles;4, diversion diversion trench;41, sphere;5, sump;51, Bearing pipe;511, protective net;52, immersible pump;521, outlet pipe;53, water level sensor;6, cladding plate;7, stablize sink;8, prevent Sheath;81, high-density layer;82, light layer;9, buffer layer;10, the soil body.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.
Embodiment 1: a kind of underground structure anti-floating system, such as Fig. 1, including foundation pit 1 further include several setting along 1 periphery of foundation pit The vertical fender pile 2 set, each vertical fender pile 2 are immediately adjacent to each other and are formed protection piling wall, so as to play one to 1 periphery of foundation pit Protective action reduces 10 pressure of the soil body that foundation pit 1 is subject to.1 bottom of foundation pit is equipped with several slope bolt piles 3 being embedded in the soil body 10, Slope bolt piles 3 is arranged diagonally downward and lower end extends to 1 middle part of foundation pit, and the gradient of slope bolt piles 3 is set as in the present embodiment 30°.The higher-end of slope bolt piles 3 is connected with the bottom of vertical fender pile 2, is equipped with steel reinforcement cage in vertical fender pile 2 and slope bolt piles 3 To improve structural strength.When level of ground water rises and generates impact to 1 bottom of foundation pit, impact force can be dispersed to by slope bolt piles 3 On slope bolt piles 3 and vertical fender pile 2, to improve the impact resistance of foundation pit 1.
Such as Fig. 1, it is equipped with buffer layer 9 between 1 bottom of foundation pit and slope bolt piles 3, buffer layer 9 is set as fine sand layer, in buffer layer 9 Fine sand between there is tiny gap, therefore generated lesser degree of by ground water pressure or 10 pressure of the soil body when slope bolt piles 3 When deformation, buffer layer 9 can produce corresponding deformation to reduce the possibility of 1 bottom compressive deformation of foundation pit, ensure that 1 bottom of foundation pit Flatness.And the shock wave and energy of ground vibration generation can be absorbed in buffer layer 9, is further reduced the production of 1 bottom of foundation pit The possibility for the shape that changes.
Such as Fig. 1 and Fig. 2, vertical fender pile 2 and slope bolt piles 3 offer interconnected diversion away from the side of foundation pit 1 Diversion trench 4, the cross section of diversion diversion trench 4 are set as semicircle.Several spheres 41, sphere 41 are filled in diversion diversion trench 4 It is inside set as hollow.Sump 5 has been dug outside foundation pit 1, has been connected between diversion diversion trench 4 and sump 5 by bearing pipe 51, Bearing pipe 51 is connected with protective net 511 close to one end of diversion diversion trench 4, and the periphery of protective net 511 is installed in inner wall of the pipe On, the hole of protective net 511 is less than sphere 41, so as to prevent sphere 41 from entering in bearing pipe 51.Bearing pipe 51 Internal diameter is not less than 20cm, to guarantee the inflow of bearing pipe 51.When level of ground water rises, underground water leads in the presence of hydraulic pressure It crosses diversion diversion trench 4 and bearing pipe 51 flows into sump 5, in the process, sphere 41 can play one to underground water A filtration, to reduce silt in underground water, the possibility in rubble inflow sump 5.
If the bottom of Fig. 1, sump 5 are equipped with an immersible pump 52, the water outlet of immersible pump 52, which is connected with, extends to earth's surface The inner wall of outer outlet pipe 521, sump 5 is equipped with water level sensor 53, when the water level in sump 5 reaches predetermined altitude When, water level sensor 53 can control the work of immersible pump 52, and immersible pump 52 extracts the underground water in sump 5 out, to reduce Local water level line around foundation pit 1, and then reduce the buoyancy that underground water generates foundation pit 1.
Such as Fig. 1, the vertical one end of fender pile 2 far from slope bolt piles 3 is installed with cladding plate 6 in the side away from foundation pit 1, and cladding plate 6 is low In 3 ~ 5 meters of Earth surface plane, cladding plate 6 is threaded through in the soil body 10 far from one end of vertical fender pile 2, so that the soil body 10 has cladding plate 6 One clamping force, when vertical fender pile 2 generates slope trend under the action of buoyancy, the soil body 10 outside foundation pit 1 to cladding plate 6 and Vertical fender pile 2 has stabilization, reduces the inclined possibility of vertical fender pile 2.Cladding plate 6 is equipped with away from the side of slope bolt piles 3 to be stablized Sink 7, outlet pipe 521 extend in stable sink 7 far from one end of immersible pump 52, so that groundwater level rises and enters collection When in well 5, this part underground water can be delivered in stable sink 7 by immersible pump 52, be full of water in stable sink 7 at this time Body, thus the gravity of water body itself can to cladding plate 6 generate a downward pressure, this downward pressure can with it is upward Buoyancy offsets, to reduce influence of the buoyancy to foundation pit 1, vertical fender pile 2 and slope bolt piles 3, improves the anti-floating energy of underground structure Power.After level of ground water decline, operator can also continue to be used for constructing or gather up using the water stablized in sink 7 Carry out secondary filter into drinkable water, and then reasonable utilization originally can generate the underground water of buoyancy to underground structure.
Such as Fig. 1,1 inner wall of foundation pit is equipped with protective layer 8, and protective layer 8 makes 1 wall of foundation pit be clamped at protective layer 8 and vertical Between fender pile 2, to improve 1 stability of foundation pit.Protective layer 8 includes high-density layer 81 and light layer 82, and high-density layer 81 is by spending Gang Yan and concreting condense, therefore density is larger.Light layer 82 can be set to plank layer or hollow concrete layer, Therefore density is lower.1 middle part of foundation pit is arranged below more than 1 middle part to be set as light layer 82 for high-density layer 81, foundation pit, and setting in this way makes The position of centre of gravity for obtaining protective layer 8 is lower, so that the center of gravity of 1 surrounding soil 10 of foundation pit is located at 1 middle and lower part of foundation pit, it is well-known , underslung structure can greatly improve the stability of structure, and then improve the anti-floating ability of foundation pit 1.
A kind of embodiment 2: construction method for underground structure anti-floating system in embodiment 1, comprising the following steps:
Operator excavates the soil body 10 by excavator first and forms required foundation pit 1, then in 1 bottom of foundation pit along 1 periphery of foundation pit Several oblique pull holes towards 1 middle part of foundation pit diagonally downward are drilled out, steel reinforcement cage are put into oblique pull hole, and be poured concrete and formed tiltedly Anchor 3.1 bottom of foundation pit is excavated later and fills out fine sand and forms buffer layer 9, is banketed towards 9 upper surface of buffer layer and is re-formed base Cheat 1 bottom.
Then a layer soil body 10 is backfilled to 1 inner sidewall of foundation pit, and is filled out in the middle and lower part of 1 side wall of 1 bottom of foundation pit and foundation pit Upper granite, casting concrete form high-density layer 81, and in the middle and lower part of 1 side wall of foundation pit, casting is connected hollow mixed with high-density layer 81 Solidifying soil forms light layer 82.Several vertical holes being connected side by side finally are drilled out in 1 periphery of foundation pit, steel reinforcement cage is put into vertical holes Casting concrete forms vertical fender pile 2 afterwards, and each vertical fender pile 2 is connected to form protection piling wall.Protection piling wall can reinforce foundation pit 1 10 pressure of the anti-soil body ability.
Diversion diversion trench 4 is reserved in vertical holes and oblique pull hole, operator digs out the soil body 10 in diversion diversion trench 4 And several spheres 41 are packed into, sump 5 is then dug out outside foundation pit 1, and get through sump 5 and diversion diversion trench 4, catchmenting Bearing pipe 51 is filled in channel between well 5 and diversion diversion trench 4 to guarantee the company between sump 5 and diversion diversion trench 4 It is logical.
Take the soil body 10 that vertical fender pile 2 deviates from 1 side of foundation pit, taking depth is 5 meters of formation grooves, and then operator will Cladding plate 6 is placed in groove slot bottom, will stablize sink 7 and is placed on cladding plate 6, in the backfill soil body 10 and stablizes sink 7 and channel side Between wall, and be compacted with road roller, thus by cladding plate 6 it is embedded in the soil body 10.Immersible pump 52 is placed in collection by last operation person 5 shaft bottom of well, then one end of outlet pipe 521 is connected to the water outlet of immersible pump 52, the other end is fixed in stable sink 7.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this All by the protection of Patent Law in the scope of the claims of invention.

Claims (10)

1. a kind of underground structure anti-floating system, including foundation pit (1), it is characterised in that: further include several along the setting of foundation pit (1) periphery Vertical fender pile (2), each vertical fender pile (2) is immediately adjacent to each other and formed protection piling wall, and foundation pit (1) bottom is equipped with several bury The slope bolt piles (3) being located in the soil body (10), each slope bolt piles (3) is arranged diagonally downward and one end and vertical fender pile (2) phase Even, each slope bolt piles (3) extends in the middle part of foundation pit (1) far from the one end of vertical fender pile (2).
2. underground structure anti-floating system according to claim 1, it is characterised in that: several vertical fender piles (2) and Slope bolt piles (3) offers interconnected diversion diversion trench (4) away from the side of foundation pit (1), and the foundation pit (1) is externally provided with collection Well (5) is connected between the diversion diversion trench (4) and sump (5) by bearing pipe (51).
3. underground structure anti-floating system according to claim 2, it is characterised in that: be equipped with diving in the sump (5) It pumps (52), the water outlet of the immersible pump (52) is connected with the outlet pipe (521) for extending to ground off-balancesheet.
4. underground structure anti-floating system according to claim 2, it is characterised in that: filling in the diversion diversion trench (4) There are several spheres (41).
5. underground structure anti-floating system according to claim 3, it is characterised in that: the bearing pipe (51) is close to diversion One end of diversion trench (4) is connected with protective net (511), and the periphery of the protective net (511) is installed in bearing pipe (51) inner wall On, the hole of the protective net (511) is less than sphere (41).
6. underground structure anti-floating system according to claim 5, it is characterised in that: the vertical fender pile (2) is far from oblique pull One end of stake (3) is equipped with cladding plate (6) in the side away from foundation pit (1), and the cladding plate (6) is arranged in the soil body (10).
7. underground structure anti-floating system according to claim 6, it is characterised in that: the cladding plate (6) deviates from slope bolt piles (3) Side be equipped with and stablize sink (7), the outlet pipe (521) extends in stable sink (7) far from the one end of immersible pump (52).
8. underground structure anti-floating system according to claim 1, it is characterised in that: foundation pit (1) inner wall is equipped with anti- Sheath (8), the protective layer (8) include high-density layer (81) and light layer (82), and foundation pit (1) middle part is arranged below for height Close layer (81), foundation pit (1) middle part is above to be set as light layer (82).
9. underground structure anti-floating system according to claim 1, it is characterised in that: foundation pit (1) bottom and slope bolt piles (3) buffer layer (9) are equipped between.
10. a kind of construction method of underground structure anti-floating system as described in claim 1, it is characterised in that including walking as follows It is rapid:
Step 1: excavating the soil body (10), is formed foundation pit (1);
Step 2: drilling out several oblique pull holes towards foundation pit (1) middle part diagonally downward along foundation pit (1) periphery in foundation pit (1) bottom, Then casting concrete forms slope bolt piles (3);
Step 3: a layer soil body (10) are backfilled to foundation pit (1) inner sidewall, then periphery drills out several vertical holes simultaneously along foundation pit (1) Casting concrete forms vertical fender pile (2).
CN201810850209.5A 2018-07-28 2018-07-28 Underground structure anti-floating system and construction method thereof Active CN109024711B (en)

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CN112663686A (en) * 2020-12-23 2021-04-16 上海康恒环境股份有限公司 Anti-floating measure device for garbage pit

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