CN213625706U - Underground engineering anti-floating structure system in earth and rock binary foundation pit - Google Patents

Abstract

The utility model belongs to the technical field of underground engineering, and relates to an underground engineering anti-floating structural system in an earth-rock binary foundation pit, which comprises an enclosure structure and an underground engineering main structure; the bottom of the enclosure structure extends into a slightly weathered rock layer of the two-dimensional earth and rock foundation pit, and an underground engineering main body structure is constructed in the enclosure structure; the side wall of underground works major structure and the outside of bottom plate junction are provided with anti bracket that floats, the gentle weathering rock stratum pot wall below the envelope outwards expand dig form with anti bracket storage tank of floating bracket shape assorted, just anti bracket that floats extends in the bracket storage tank. The utility model discloses form the bracket storage tank with the efflorescence rock stratum pot wall below the envelope outwards expands to in extending the bracket storage tank with the anti bracket that floats that the outside of underground works major structure's side wall and bottom plate junction set up, in order that the anti ability of scraping something to the next thing of make full use of rock realizes anti floating, reduce or replace other anti engineering volumes that float such as anti-drawing pile.

Description

Underground engineering anti-floating structure system in earth and rock binary foundation pit

Technical Field

The utility model belongs to the technical field of underground works, a underground works anti structure system that floats in geotechnique binary foundation ditch is related to, concretely relates to underground works hole wall expands digs anti structure system that floats of bracket, is applicable to among the geotechnique binary foundation ditch.

Background

With the rapid development of the modern construction of our country, the basic construction business is developed vigorously. Underground engineering construction such as real estate basements, subway, intercity railway and high-speed rail underground stations, municipal underground passages, civil air defense underground spaces and the like is underway. Many urban building foundation pits widely exist in China in upper and lower soil-rock binary strata, and the soil-rock binary foundation pit refers to a foundation pit with the upper part located in a common soil layer and the lower part of the foundation pit provided with a thicker middle weathered rock stratum and a slightly weathered rock stratum. The urban building deep foundation pit basically does not have the slope-setting excavation condition, and the open cut foundation pit supporting system is generally formed by a lateral retaining structure (such as an underground continuous wall or a pile) and a horizontal support (such as an inner support of a steel support, a reinforced concrete support and the like or a prestressed anchor cable support). Because the building envelope is difficult to construct in the hard rock stratum, the supporting system is more economical by adopting the hanging feet.

The traditional weight-bearing anti-floating technology for the overhanging bottom plate needs to enlarge the width of a foundation pit, occupies more fields, increases the number of projects such as temporary land utilization, greening migration, pipeline relocation, traffic dispersion and the like, increases the implementation difficulty, and increases the excavation and backfilling project amount of earth and stone.

Therefore, for the underground engineering with the anti-floating requirement, an economical and practical anti-floating structural system of the underground engineering in the soil-rock binary foundation pit is needed to be designed.

Disclosure of Invention

In order to overcome the not enough of above-mentioned prior art existence, the utility model aims at providing an underground works anti structure system that floats in geotechnique binary foundation ditch, can the make full use of rock anti ability of agreing realize anti floating, reduce or replace other anti engineering volumes that float such as anti-floating pile.

In order to achieve the purpose, the technical scheme of the utility model is an underground engineering anti-floating structural system in an earth-rock binary foundation pit, which comprises an enclosure structure and an underground engineering main structure; the bottom of the enclosure structure extends into a slightly weathered rock layer of the two-dimensional earth and rock foundation pit, and an underground engineering main body structure is constructed in the enclosure structure; the side wall of underground works major structure and the outside of bottom plate junction are provided with anti bracket that floats, the gentle weathering rock stratum pot wall below the envelope outwards expand dig form with anti bracket storage tank of floating bracket shape assorted, just anti bracket that floats extends in the bracket storage tank.

Further, the longitudinal section of anti bracket that floats is trapezoidal, just the top surface of anti bracket that floats by the outside to the inboard tilt up of anti bracket that floats.

Further, the included angle between the top surface of the anti-floating corbel and the horizontal plane is 30 degrees.

Furthermore, the height of the anti-floating corbel is 2.2 m-2.579 m, and the width of the anti-floating corbel is 1.0 m.

Further, anti bracket edge that floats the outside of underground works major structure's side wall and bottom plate junction is arranged in succession or the interval arrangement, the bracket storage tank with anti bracket one-to-one that floats.

Further, anti bracket that floats with underground works major structure is reinforced concrete structure, just anti bracket that floats with underground works major structure integrated into one piece pours the shaping.

Furthermore, the enclosure structure is a foot hanging pile or a foot hanging wall, the top of the foot hanging wall or the foot hanging pile is provided with a crown beam, and the bottom of the foot hanging wall or the foot hanging pile extends into a slightly weathered rock stratum of the soil-rock binary foundation pit; and a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the Weathered rock stratum pit below the bottom surface of the foot hanging wall or the foot hanging pile.

Furthermore, when the enclosure structure comprises a foot hanging wall, when a weak stratum exists in the range of the foot hanging wall, the inner side and the outer side of the part of the foot hanging wall in the range of the weak stratum are respectively provided with a groove wall reinforcing structure.

Further, when the enclosure structure is a foot hanging pile, a steel mesh sprayed concrete surface protection structure is arranged on the pit wall between the foot hanging piles.

Further, the mesh reinforcement sprayed concrete surface protection structure comprises mesh reinforcement hung on the pit wall, concrete sprayed on the mesh reinforcement and a plurality of rows of soil nails inserted into the pit wall, wherein one ends of the soil nails extend out of the pit wall and are embedded in the mesh reinforcement.

Compared with the prior art, the beneficial effects of the utility model are that:

(1) the utility model digs the Weathered rock stratum pit wall below the enclosure structure outwards to form a bracket containing groove, and extends the anti-floating bracket arranged outside the joint of the side wall of the underground engineering main structure and the bottom plate into the bracket containing groove, so as to fully utilize the anti-floating capability of the rock to realize anti-floating and reduce or replace other anti-floating engineering quantities such as anti-pulling piles;

(2) the utility model provides an anti structure system that floats of underground works's atress is clear and definite, the construction is simple, investment saving, reduction of erection time in the soil rock binary foundation ditch, and economic benefits is obvious.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an underground engineering anti-floating structural system in a soil-rock binary foundation pit according to an embodiment of the present invention;

in the figure: 1. the building envelope, 2, a crown beam, 3, a waist beam, 4, an inner support, 5, soil nails, 6, a reinforcing mesh, 7, concrete, 8, an underground engineering main structure, 81, a bottom plate, 82, a side wall, 83, a middle plate, 84, a top plate, 9, a groove wall reinforcing pile structure, 10, a slightly weathered rock stratum top surface, 11, an anti-floating bracket, 12 and a bracket accommodating groove.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, an embodiment of the present invention provides an anti-floating structure system for underground engineering in an earth-rock binary foundation pit, including an enclosure structure 1 and an underground engineering main structure 8; the bottom of the enclosure structure 1 extends into a slightly weathered rock stratum of the soil-rock binary foundation pit; the interior construction of envelope 1 has underground works major structure 8, underground works major structure 8's side wall 82 and the outside of bottom plate 81 junction are provided with anti bracket 11 that floats, the little morals and manners stratum hole wall below the reinforcing bar net injection concrete armor structure outwards expand dig form with anti bracket storage tank 12 that floats 11 shape assorted of bracket, just anti bracket 11 that floats extends in the bracket storage tank 12 and hug closely little morals and manners stratum hole wall. In the embodiment, the slightly weathered rock is regarded as a building material, the bracket accommodating groove 12 is formed by outwards and locally digging the position, corresponding to the bottom plate 81 of the main structure 8 of the underground engineering, of the slightly weathered rock pit wall below the enclosure structure 1, and the anti-floating bracket 11 formed by outwards expanding the joint of the side wall 82 of the main structure of the underground engineering and the bottom plate 81 extends to the bracket accommodating groove 12 so as to embed the anti-floating bracket 11 in the rock pit wall, so that the anti-floating is realized by utilizing the anti-floating capacity of the rock, and other anti-floating engineering quantities such as anti-uplift piles are reduced or replaced.

Further, the longitudinal section of the anti-floating bracket 11 is trapezoidal, and the top surface of the anti-floating bracket 11 is inclined upwards from the outer side to the inner side of the anti-floating bracket 11. Further, the angle between the top surface of the anti-floating corbel 11 and the horizontal plane is 30 degrees. As shown in fig. 1, the longitudinal section of the anti-floating corbel 11 is a right trapezoid, the bottom side of the anti-floating corbel is a right-angle side, and the top side of the anti-floating corbel is a bevel side; and the top surface of anti superficial bracket 11 and the contained angle between the horizontal plane are 30 to transmit groundwater to the stable slightly weathered rock stratum in the foundation ditch outside more to the floating force of underground works major structure, utilize the anti bentgrass of rock to make underground works major structure more stable.

The size of the anti-floating bracket 11 of the embodiment can be set according to the actual anti-floating requirement; in one embodiment, the anti-floating corbel 11 has a height of 2.2m to 2.579m and a width of 1.0 m.

Further, the anti-floating corbels 11 are arranged continuously or at intervals along the outer side of the joint of the side wall 82 and the bottom plate 81 of the underground engineering main structure 8, and the corbel accommodating grooves 12 are in one-to-one correspondence with the anti-floating corbels 11. The anti bracket 11 that floats of this embodiment can arrange in succession, also can adopt a plurality of interval arrangements, and concrete anti floating demand setting as required actually.

Further, anti bracket 11 that floats with underground works major structure 8 is reinforced concrete structure, just anti bracket 11 that floats with underground works major structure 8 integrated into one piece pours the shaping. The bracket 11 and the underground works major structure 8 of anti floating of this embodiment are under construction simultaneously, form a whole, can satisfy the anti requirement of floating of underground works major structure 8 through the cooperation of bracket storage tank 12 in anti bracket 11 and the slightly weathered rock formation that floats.

Furthermore, the enclosure structure 1 is a foot hanging pile or a foot hanging wall, the top of the foot hanging wall or the foot hanging pile is provided with a crown beam 2, the bottom of the foot hanging wall or the foot hanging pile extends into a slightly weathered rock layer of the soil-rock binary foundation pit, and a steel bar mesh sprayed concrete surface protection structure is arranged on the foot hanging wall or the slightly weathered rock layer pit wall of the foot hanging part below the bottom surface of the foot hanging wall or the foot hanging pile, so that the flatness of the pit wall is ensured, and the construction of the underground engineering main body structure 8 is facilitated. The bottom of the envelope structure 1 of this embodiment may be set with or without a shoulder. When the bottom of the enclosure structure 1 is not provided with the rock shoulder embedded structure, namely the inner side surface of the enclosure structure 1 is flush with the inner side surface of the steel bar mesh sprayed concrete surface protection structure, the mechanical properties of rocks are fully utilized, slightly weathered rocks are taken as building materials, the bottom of the enclosure structure 1 extends into the slightly weathered rock layer and is hung on the feet, and the steel bar mesh sprayed concrete surface protection structure is arranged on the vertical pit wall of the slightly weathered rock layer of the hanging foot part, the self-stability of the slightly weathered rock layer is fully utilized, a safe and reliable supporting system is formed by combining a plurality of inner supports 4, the outline of the foundation pit is compact, the occupation of a construction site, the excavation of earthwork and the influence on the surrounding environment are reduced, the working procedures are simplified, the. The stability of the foundation pit in this embodiment is controlled by the support system and the hard rock stratum.

Furthermore, when the enclosure structure 1 is a hanging foot wall, and when a weak stratum exists in the range of the hanging foot wall, the groove wall reinforcing structures 9 are arranged on the inner side and the outer side of the part of the hanging foot wall in the range of the weak stratum. The structure 9 of the trench wall reinforcing piles in this embodiment may be a jet grouting pile, a mixing pile, or the like. When the top of the suspended footing wall is located in a better stratum range, the groove wall reinforcing structures 9 are not needed to be arranged on the inner side and the outer side of the top of the suspended footing wall.

Furthermore, when the enclosure structure 1 is a hanging foot pile, a steel mesh sprayed concrete surface protection structure is arranged on the pit wall between the hanging foot piles. In this embodiment, the slightly weathered rock layer pit wall of the hanging foot part below the bottom surface of the enclosure structure 1 and the pit wall between the hanging foot piles on the upper part are all protected by concrete sprayed by hanging reinforcing mesh, so that the flatness of the pit wall is ensured to facilitate the construction of the side wall 82 of the main structure, and meanwhile, the crushed rock and the crushed soil can be prevented from entering the foundation pit to influence the construction progress and safety.

Furthermore, when the enclosure structure 1 is a foot hanging pile, an inter-pile water stop structure is arranged between the adjacent foot hanging piles. This embodiment can set up stagnant water structure between stake between adjacent foot stake according to the actual requirement of foundation ditch upper portion stratum, improves water-proof effects.

Further, the bottom of the enclosure structure 1 is close to the middle plate 83 located at one layer of the main structure 8 in the dual-element soil-rock foundation pit, and the bottom surface of the enclosure structure 1 is located below the middle plate 83 located at the layer close to the bottom of the enclosure structure 1 and is not less than 1.5 m. When the main structure 8 needs to dismantle the inner support 4 above the middle plate 83 in the construction process, the bottom surface of the enclosure structure 1 is embedded below the inner support 4, the manufactured main structure is close to the bottom of the enclosure structure 1, and the bottom surface of the middle plate 83 is not less than 1.5m, at the moment, the middle plate 83 of the main structure close to the bottom of the enclosure structure 1 can play a role of locking feet, a prestressed anchor cable locking foot does not need to be arranged at the bottom of the enclosure structure 1, and the underground obstacle effect of the prestressed anchor cable locking foot on later-stage underground space development is eliminated; the specific extension of the bottom surface of the enclosure 1 below the middle plate 83 of the main body structure 8 can be determined according to actual conditions. In the embodiment, the prestressed anchor cable locking pin can be arranged at the bottom of the enclosure structure 1 instead of the middle plate 83 locking pin.

Further, the mesh reinforcement sprayed concrete facing structure comprises a mesh reinforcement 6 hung on the pit wall, concrete 7 sprayed on the mesh reinforcement 6, and a plurality of rows of soil nails 5 inserted into the pit wall, wherein one ends of the soil nails 5 extend out of the pit wall and are embedded in the mesh reinforcement 6. Further, the soil nails 5 are inserted obliquely downward into the walls of the slightly weathered rock pits. In this embodiment, one end of the soil nail 5 is embedded into the steel bar mesh concrete structure, and the other end is inserted into the pit wall, so that the steel bar mesh concrete structure is effectively fixed on the pit wall, and the construction safety is improved.

As shown in fig. 1, the main foundation pit of the subway station is located in the Zhou Yi-Zhou area of Guangzhou city, arranged along the east-west direction of the Zhou-Zhou area, and is a two-line transfer station, the civil engineering parts of the stations of the two lines are synchronously designed and implemented, the station platform is a double-island four-line structure, and the cross section of the standard section is a four-layer four-span structure. The total length of the foundation pit is 276.2m, the width of the standard section foundation pit is 47.1m, and the depth of the foundation pit is about 34.4 m. The rock soil layer in the field is an artificial fill layer, a sea-land interaction phase layer silt layer and a silt soil layer from top to bottom, 7 layers of coarse sand, a rock full weathering zone, a strong weathering zone, a medium weathering zone and a slightly weathering zone in a scouring-flooding phase deposition layer are combined, and the slightly weathered conglomerate is shallow in buried depth. The foundation pit of the station open cut section is constructed by adopting an open cut smooth method, the foundation pit of the section adopts a support structure system of the enclosure structure 1+ support anchor members provided by the embodiment, wherein the enclosure structure 1 adopts a 1m thick foot hanging wall, and the support anchor members adopt inner supports 4, and the total number is four. The foot-hanging wall extends into the slightly weathered rock stratum from the bottom of the crown beam 2, the bottom of the foot-hanging wall is positioned 1.5m below the bottom surface of the middle plate 83 in the three underground layers of the main structure of the station, and the height of the foot-hanging wall is about 22.6 m. All the first to fourth inner supports 4 adopt reinforced concrete inner supports. The height of a vertical pit wall of a slightly weathered rock surface of a lifting foot part below the bottom surface of the lifting foot wall is about 10.8m, the vertical pit wall is tightly attached to a main structure of a station, a concrete protective surface is sprayed by adopting a steel bar hanging net, and an upper soil layer is reinforced by adopting a phi 600@450 uniaxial mixing pile groove wall. Because station major structure volume is big, anti floating is in outstanding position. Because the underground first layer and the underground second layer are in wide butt joint with the underground space, the enclosure structure is widely broken, and the difficulty of the enclosure structure 1 participating in anti-floating is large. Therefore, the rock pit wall is expanded and excavated at the bottom of the foundation pit, a trapezoidal anti-floating bracket 11 is arranged on the outer side of the joint of the side wall 82 and the bottom plate 81 of the main structure 8 of the underground engineering, the height of the anti-floating bracket 11 is 2.2-2.579 m, the width of the anti-floating bracket 11 is 1.0m, and the top surface of the anti-floating bracket 11 is 30 degrees along the slope. According to actual requirements, the mechanical property of rocks is fully utilized, the slightly weathered rock stratum pit wall below the steel bar mesh sprayed concrete surface protection structure is excavated outwards to form a bracket accommodating groove 12, an anti-floating bracket 11 is arranged on the outer side of the junction of the bottom plate 81 and the side wall 82, the anti-floating bracket 11 extends into the bracket accommodating groove 12 and resists floating together with the uplift pile, and the anti-floating design requirement is met; and the investment is saved, the construction period is shortened, and the technology and the economic benefits are obvious.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An underground works anti structure system that floats in soil rock binary foundation ditch which characterized in that: the building comprises a building enclosure structure and an underground engineering main structure; the bottom of the enclosure structure extends into a slightly weathered rock layer of the two-dimensional earth and rock foundation pit, and an underground engineering main body structure is constructed in the enclosure structure; the side wall of underground works major structure and the outside of bottom plate junction are provided with anti bracket that floats, the gentle weathering rock stratum pot wall below the envelope outwards expand dig form with anti bracket storage tank of floating bracket shape assorted, just anti bracket that floats extends in the bracket storage tank.

2. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 1, wherein: the longitudinal section of the anti-floating bracket is trapezoidal, and the top surface of the anti-floating bracket is inclined upwards from the outer side to the inner side of the anti-floating bracket.

3. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 2, wherein: the included angle between the top surface of the anti-floating bracket and the horizontal plane is 30 degrees.

4. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 1, wherein: the height of the anti-floating bracket is 2.2 m-2.579 m, and the width of the anti-floating bracket is 1.0 m.

5. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 1, wherein: the anti bracket that floats is followed the outside of underground works major structure's side wall and bottom plate junction is arranged in succession or the interval arrangement, the bracket storage tank with anti bracket one-to-one that floats.

6. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 1, wherein: the anti bracket that floats with the underground works major structure is reinforced concrete structure, just anti bracket that floats with the integral casting shaping of underground works major structure.

7. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 1, wherein: the enclosure structure is a foot hanging pile or a foot hanging wall, the top of the foot hanging wall or the foot hanging pile is provided with a crown beam, and the bottom of the foot hanging wall or the foot hanging pile extends into a slightly weathered rock layer of the soil-rock binary foundation pit; and a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the Weathered rock stratum pit below the bottom surface of the foot hanging wall or the foot hanging pile.

8. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 7, wherein: when the enclosure structure is a foot hanging wall, and when a weak stratum exists in the range of the foot hanging wall, groove wall reinforcing structures are arranged on the inner side and the outer side of the part of the foot hanging wall in the range of the weak stratum.

9. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 7, wherein: when the enclosure structure is a hanging foot pile, a steel bar mesh sprayed concrete surface protection structure is arranged on the pit wall between the hanging foot piles.

10. The underground engineering anti-floating structural system in the earth-rock binary foundation pit as claimed in claim 7 or 9, wherein: the steel bar net sprayed concrete surface protection structure comprises a steel bar net hung on the pit wall, concrete sprayed on the steel bar net and a plurality of rows of soil nails inserted into the pit wall, wherein one ends of the soil nails extend out of the pit wall and are embedded into the steel bar net.

Images