CN112049117B - Earth-rock binary foundation pit supporting structure system - Google Patents

Earth-rock binary foundation pit supporting structure system Download PDF

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Publication number
CN112049117B
CN112049117B CN202010670345.3A CN202010670345A CN112049117B CN 112049117 B CN112049117 B CN 112049117B CN 202010670345 A CN202010670345 A CN 202010670345A CN 112049117 B CN112049117 B CN 112049117B
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China
Prior art keywords
rock
soil
retaining structure
wall
foundation pit
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CN202010670345.3A
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CN112049117A (en
Inventor
李隆平
雷文革
王洪华
王天水
黄德钦
李良军
冯景太
李鹏飞
董先正
麦宇浩
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China Railway Major Bridge Reconnaissance and Design Institute Co Ltd
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China Railway Major Bridge Reconnaissance and Design Institute Co Ltd
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Priority to CN202010670345.3A priority Critical patent/CN112049117B/en
Publication of CN112049117A publication Critical patent/CN112049117A/en
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00Excavations; Bordering of excavations; Making embankments
    • E02D17/02Foundation pits
    • E02D17/04Bordering surfacing or stiffening the sides of foundation pits
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00Independent underground or underwater structures; Retaining walls
    • E02D29/045Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/0007Base structures; Cellars
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00Materials
    • E02D2300/0004Synthetics
    • E02D2300/0018Cement used as binder
    • E02D2300/002Concrete
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00Miscellaneous
    • E02D2600/30Miscellaneous comprising anchoring details
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A10/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
    • Y02A10/23Dune restoration or creation; Cliff stabilisation

Abstract

The invention belongs to the technical field of foundation pit engineering, and particularly relates to an earth-rock binary foundation pit supporting structure system which comprises a soil retaining structure and a plurality of supporting anchor components for supporting the soil retaining structure; the soil retaining structure is a foot hanging pile or a foot hanging wall; the bottom of the soil retaining structure extends into the slightly weathered rock layer of the soil-rock binary foundation pit, the bottom of the soil retaining structure is embedded and fixed without a rock shoulder, and a steel bar mesh sprayed concrete surface protecting structure is arranged on the wall of the slightly weathered rock layer below the bottom surface of the soil retaining structure. According to the invention, the bottom of the retaining structure extends into the slightly weathered rock stratum, the self-stability of the pit wall of the slightly weathered rock stratum is fully utilized, a safe and reliable supporting structure system is formed by combining a plurality of anchor supporting members, the rock shoulder embedding and the prestressed anchor cable locking foot are not arranged at the bottom of the retaining structure, the outline of the foundation pit is compact, the occupation of a construction site, the earth excavation and the influence on the surrounding environment are reduced, the working procedures are simplified, and the underground barrier effect of the locking foot prestressed anchor cable on the later-stage underground space development is eliminated.

Description

Earth rock binary foundation ditch supporting construction system
Technical Field
The invention belongs to the technical field of foundation pit engineering, and particularly relates to an earth-rock binary foundation pit supporting structure system.
Background
With the rapid development of the modern construction of our country, the basic construction business is developed vigorously. Underground engineering construction of real estate basements, subways, intercity railways, high-speed rail underground stations, municipal underground passages, civil air defense underground spaces and the like is underway. In China, a plurality of urban building foundation pits widely exist in upper-soil-lower-rock binary strata, and the upper part of each soil-rock binary foundation pit is positioned in a common soil layer, and the lower part of each foundation pit is 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 condition of slope excavation, and a 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 construction of the soil retaining structure in the hard rock stratum is difficult, the construction period is long, the construction period of the foundation pit is greatly influenced, and the construction noise of the supporting structure has great influence on the surrounding environment. In order to reduce these adverse effects, suspended footer wall (piling) technology has been developed.
The traditional suspended footing wall (pile) technical scheme is generally provided with rock shoulders for embedding and fixing the suspended footing wall (pile). However, the surrounding traffic is busy, underground pipelines are dense, and the increased shoulder width means that pipelines are changed more, and meanwhile, pressure is brought to traffic fluffing, and sometimes, the shoulder width even becomes a key element for restricting schemes.
Traditional foot-lifting walls (piles) are all provided with prestressed anchor cables and locking feet, but for urban underground spaces, the prestressed anchor cables are likely to become underground barriers for later-stage underground space development.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide an earth-rock binary foundation pit supporting structure system which can reduce the occupation of a construction site, the excavation of earth and the influence on the surrounding environment, simplify the working procedures, shorten the construction period and save the investment.
In order to achieve the purpose, the technical scheme of the invention is an earth-rock binary foundation pit supporting structure system, which comprises a soil retaining structure and a plurality of supporting and anchoring components for supporting the soil retaining structure; the soil retaining structure is a foot hanging pile or a foot hanging wall; the bottom of the soil retaining structure extends into a slightly weathered rock stratum of the soil-rock binary foundation pit, and no rock shoulder is embedded and fixed at the bottom of the soil retaining structure; and a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the slightly weathered rock stratum pit below the bottom surface of the soil retaining structure.
Furthermore, a top beam is arranged on the top surface of the soil retaining structure, and a plurality of waist beams which are arranged at intervals from top to bottom are arranged on the inner side wall of the soil retaining structure; the uppermost supporting anchor component is supported on the crown beam, and the rest supporting anchor components are respectively supported on the waist beams.
Furthermore, each branch anchor component is an inner support or a prestressed anchor cable.
Furthermore, the bottom of the soil retaining structure is close to the middle plate of one layer of the main body structure in the two-element foundation pit of the soil rock, and the bottom surface of the soil retaining structure is not less than 1.5m below the middle plate of the layer.
Furthermore, when the soil retaining 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, located in the range of the weak stratum, of the foot hanging wall.
Further, when the soil retaining structure is a foot hanging pile, a steel bar 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.
Further, the soil nails are inserted obliquely downward into the walls of the slightly weathered rock pits.
Furthermore, when the soil retaining structure is a foot hanging pile, an inter-pile water stopping structure is arranged between the adjacent foot hanging piles.
Compared with the prior art, the invention has the following beneficial effects:
(1) the bottom of a foot-hanging pile or a foot-hanging wall extends into a slightly weathered rock layer of a soil-rock binary foundation pit, a reinforcing mesh is hung on the slightly weathered rock layer pit wall of a foot-hanging part below the bottom surface of the foot-hanging pile or the foot-hanging wall to spray a concrete protective surface, the mechanical properties of the rock are fully utilized, the slightly weathered rock is taken as a building material, the slightly weathered rock layer pit wall is fully utilized to be self-stabilized, a safe and reliable supporting system is formed by combining a plurality of anchor components, no rock shoulder is arranged at the bottom of a soil retaining structure for embedding, the outline of the foundation pit is compact, the occupation of a construction site, the excavation of soil and the influence on the surrounding environment are reduced, and the working procedures are simplified;
(2) the invention does not arrange the prestressed anchor cable locking foot at the bottom of the soil retaining structure, and forms an integral stable system by a plurality of anchor supporting members, the soil retaining structure and the main body structure, thereby eliminating the underground obstacle effect of the prestressed anchor cable locking foot on the development of the underground space in the later period.
(3) The bottom of the soil retaining structure is close to the middle plate of one layer of the main structure in the two-element foundation pit of the soil and rock, the bottom surface of the soil retaining structure is not less than 1.5m below the middle plate of the layer, when a support anchor member above the middle plate of the layer needs to be removed in the process of building back of the main structure, the bottom surface of the soil retaining structure is embedded below the support anchor member, the manufactured main structure is not less than 1.5m below the bottom surface of the middle plate of the layer of the main structure close to the bottom of the soil retaining structure, and the middle plate of the layer of the main structure close to the bottom of the soil retaining structure can play a role in locking feet;
(4) the soil-rock binary foundation pit supporting structure system provided by the invention has the advantages of definite stress, simplicity in construction, investment saving, shortened construction period, small occupied area (the relocation and modification of pipelines can be reduced, the workload of traffic relief is reduced, the influence on the surrounding environment is reduced), and obvious economic benefit.
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 view of a soil-rock binary foundation pit supporting structure system provided by an embodiment of the invention;
in the figure: 1. soil retaining structure, 2, crown beam, 3, waist beam, 4, inner support, 5, soil nail, 6, reinforcing mesh, 7, concrete, 8, main structure, 81, bottom plate, 82, middle plate, 83, top plate, 9, groove wall reinforcing structure, 10, slightly weathered rock surface, 11, anti-floating bracket, 12 and bracket accommodating groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within 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 only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, 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, the embodiment provides an earth-rock binary foundation pit supporting structure system, which includes a soil retaining structure 1 and a plurality of supporting anchor members for supporting the soil retaining structure 1; the soil retaining structure 1 is a foot hanging pile or a foot hanging wall; the bottom of the soil retaining structure 1 extends into a slightly weathered rock stratum of the soil-rock binary foundation pit, the bottom of the soil retaining structure 1 is embedded and fixed without a rock shoulder, and a steel bar mesh sprayed concrete surface protecting structure is arranged on the slightly weathered rock stratum pit wall of a foot hanging part below the bottom surface of the soil retaining structure 1. In the embodiment, no rock shoulder is embedded and fixed at the bottom of the foot-hanging pile or the foot-hanging wall, namely, the inner side surface of the soil-retaining structure 1 is flush with the inner side surface of the steel bar net sprayed concrete surface-protecting structure, the mechanical property of rock is fully utilized, slightly weathered rock is considered as building material, the bottom of the foot-hanging pile or the foot-hanging wall extends into the slightly weathered rock layer, the steel bar net sprayed concrete surface-protecting structure is arranged on the vertical pit wall of the slightly weathered rock layer of the foot-hanging part, the slightly weathered rock layer pit wall is self-stabilized by fully utilizing, a plurality of anchor components are combined, a safe and reliable supporting system is formed, the outline line 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 investment is saved, and the construction period is shortened. The stability of the foundation pit in this embodiment is controlled by the support structure system and the hard rock stratum.
Furthermore, a top beam 2 is arranged on the top surface of the soil blocking structure 1, and a plurality of waist beams 3 which are arranged at intervals from top to bottom are arranged on the inner side wall of the soil blocking structure 1; the uppermost anchor member is supported by the crown beam 2, and the remaining anchor members are supported by the waist beams 3, respectively. The suspension foot pile or the suspension foot wall of the embodiment extends into a complete rock stratum (a slightly weathered rock stratum) from the bottom of the crown beam 2, and one of the support anchor components is supported at the bottom of the suspension foot pile or the suspension foot wall and is positioned on a middle plate 82 of the main structure 8 in the earth-rock binary foundation pit, which is close to the bottom of the suspension foot pile or the suspension foot wall, so that the stability of a support structure system before the main structure 8 is built is ensured.
Furthermore, each branch anchor component is an inner support 4 or a prestressed anchor cable; the inner support 4 can be a reinforced concrete inner support or a steel pipe inner support; the embodiment can select the structural form adopted by each anchor supporting component according to the specific situation of the site.
Further, the bottom of the soil guard structure 1 is close to the middle plate 82 of one layer of the main structure 8 in the dual-element soil-rock foundation pit, and the bottom surface of the soil guard structure 1 is not less than 1.5m below the middle plate 82 of the layer. When main structure 8 need demolish a layer of anchor component above this layer of medium plate 82 in the process of building back the construction, main structure 8 that the bottom surface of soil retaining structure 1 has been built and has been done to this way of anchor component below is close to below the one deck medium plate 82 bottom surface of soil retaining structure 1 and is no less than 1.5m, and at this moment, main structure 8 is close to the one deck medium plate 82 of soil retaining structure 1 bottom and can play the lock foot effect, improves soil retaining structure 1's stability. In the embodiment, the prestressed anchor cable locking foot is not arranged at the bottom of the soil retaining structure 1, and an integral stable system is formed by a plurality of anchor supporting members, the main body structure 8 and the soil retaining structure 1 together, so that the underground obstacle effect of the prestressed anchor cable locking foot on the development of the underground space in the later period is eliminated; the specific extension of the bottom surface of the retaining structure 1 below the middle plate 82 of the main structure 8 can be determined according to the actual situation.
Furthermore, when the soil retaining structure 1 is a footing wall, and when a weak ground layer exists in the footing wall range, the groove wall reinforcing structures 9 are respectively arranged on the inner side and the outer side of the part of the footing wall in the weak ground layer range. The tank wall reinforcing piles 9 in this embodiment may be jet grouting piles, stirring piles, or the like.
Furthermore, when the soil retaining structure 1 is a hanging foot pile, a steel bar mesh sprayed concrete surface protecting structure is arranged on the pit wall between the hanging foot piles. In this embodiment, the slightly weathered rock stratum pit wall of the foot hanging part below the bottom surface of the soil-retaining structure 1 and the pit wall between the foot hanging piles on the upper part are all protected by concrete sprayed by the steel bar net, so as to ensure the flatness of the pit wall and facilitate the construction of the side wall of the main structure 8, and meanwhile, the crushed rock and the crushed soil can be prevented from entering the foundation pit to influence the construction progress and safety.
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.
Furthermore, when the soil guard structure 1 is a foot hanging pile, a water stop structure between piles is arranged between 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 slightly weathered rock stratum pit wall below the steel bar mesh sprayed concrete surface protection structure of the embodiment is excavated outwards to form a bracket accommodating groove 12 for accommodating an anti-floating bracket 11 arranged outside the joint of the side wall 82 and the bottom plate 81 of the main body structure 8; the anti-floating corbel 11 extends into the corbel accommodating groove 12 and is tightly attached to the wall of the slightly weathered rock stratum pit, so that the anti-floating corbel 11 is embedded in the rock pit wall, anti-floating is realized by using the anti-floating capacity of the rock, and other anti-floating engineering quantities such as uplift piles and the like are reduced or replaced; and the mechanical properties of the slightly weathered rock stratum are fully utilized, and the bracket accommodating groove is formed by locally digging outwards the wall of the slightly weathered rock stratum pit, so that the bracket accommodating groove is safe and reliable.
Further, the shape of the bracket accommodating groove 12 is matched with that of the anti-floating bracket 11, specifically, the longitudinal sections of the bracket accommodating groove 12 and the anti-floating bracket 11 can be both trapezoidal, as shown in fig. 1, and the top surface of the bracket accommodating groove 12 and the top surface of the anti-floating bracket 11 are both inclined upwards from the outer side to the inner side; optimally, the contained angle between the top surface of bracket storage tank 12 and the horizontal plane and the contained angle between the top surface of anti-floating bracket 11 and the horizontal plane are 30 to transmit groundwater to the stable slightly weathered rock stratum in the foundation ditch outside to the floating force of major structure 8 more, utilize the rock anti to scrape and make major structure 8 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.
Furthermore, the anti-floating corbels 11 are continuously arranged or arranged at intervals along the outer side of the joint of the side wall 82 and the bottom plate 81 of the main body structure 8, and the corbel accommodating grooves 12 correspond to the anti-floating corbels 11 one by one. The anti bracket 11 and the bracket storage tank 12 that float of this embodiment can arrange in succession, also can adopt a plurality of interval arrangements, and concrete anti-floating demand setting as required actually.
Furthermore, the anti-floating bracket 11 and the main body structure 8 are both of reinforced concrete structures, the anti-floating bracket 11 and the main body structure 8 are integrally cast to form a whole, and the anti-floating requirement of the main body structure 8 can be met through the matching of the anti-floating bracket 11 and the bracket accommodating groove 12 in the slightly weathered rock stratum.
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 open cut section of the station is constructed by adopting an open cut smooth method, the foundation pit of the section adopts the soil-rock binary foundation pit supporting structure system provided by the embodiment, wherein the soil retaining structure 1 adopts a 1m thick foot hanging wall, and the supporting anchor component adopts an inner support 4 for four ways. The foot hanging wall extends into the slightly weathered rock 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 82 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 hanging foot part below the bottom surface of the hanging foot wall is about 10.8m, a concrete protective surface is sprayed by adopting a hanging reinforcing mesh, and an upper soil layer is reinforced by adopting a phi 600@450 uniaxial mixing pile groove wall. The foundation pit combines geology and peripheral conditions, adopts a footing wall and inner support supporting system to meet the design requirements of the foundation pit, simplifies the construction process, saves investment, shortens the construction period, reduces the construction difficulty, reduces the influence on the peripheral environment, and has remarkable technical and economic benefits.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. The utility model provides an earth rock binary foundation ditch supporting construction system which characterized in that: the multi-channel anchor supporting structure comprises a soil retaining structure and a plurality of channels of anchor supporting members for supporting the soil retaining structure; the soil retaining structure is a foot hanging pile or a foot hanging wall; the bottom of the soil retaining structure extends into a slightly weathered rock stratum of the soil-rock binary foundation pit, and no rock shoulder is embedded and fixed at the bottom of the soil retaining structure; a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the slightly weathered rock stratum pit below the bottom surface of the soil retaining structure; the slightly weathered rock stratum pit wall below the reinforcing mesh sprayed concrete surface protection structure is outwards excavated to form a bracket accommodating groove, the soil-rock binary foundation pit is constructed by adopting an open excavation forward method, a main body structure in the soil-rock binary foundation pit is applied and manufactured by clinging to the reinforcing mesh sprayed concrete surface protection structure, and an anti-floating bracket arranged on the outer side of the bottom of the main body structure extends into the bracket accommodating groove and clings to the slightly weathered rock stratum pit wall; the bottom of the soil retaining structure is close to the middle plate located at one layer of the main body structure in the dual-element soil rock foundation pit, the bottom surface of the soil retaining structure is located below the middle plate of the layer, after the middle plate of the layer is built again, a locking effect is formed on the building enclosure, and then the anchor component above the building enclosure is dismantled.
2. The earth-rock binary foundation pit supporting structure system of claim 1, wherein: the top surface of the soil retaining structure is provided with a crown beam, and the inner side wall of the soil retaining structure is provided with a plurality of waist beams which are arranged at intervals from top to bottom; the uppermost supporting anchor component is supported on the crown beam, and the rest supporting anchor components are respectively supported on the waist beams.
3. An earth-rock binary foundation pit supporting structure system according to claim 1 or 2, characterized in that: each branch anchor component is an inner support or a prestressed anchor cable.
4. The earth-rock binary foundation pit supporting structure system of claim 1, wherein: when the soil retaining 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, in the range of the weak stratum, of the foot hanging wall.
5. The earth-rock binary foundation pit supporting structure system of claim 1, wherein: when the soil retaining structure is a foot-lifting pile, a reinforcing mesh sprayed concrete face protecting structure is arranged on the pit wall between the foot-lifting piles.
6. The earth-rock binary foundation pit supporting structure system of claim 1 or 5, 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.
7. The earth-rock binary foundation pit supporting structure system of claim 6, wherein: the soil nails are obliquely and downwards inserted into the walls of the slightly weathered rock stratum pits.
8. The earth-rock binary foundation pit supporting structure system of claim 1, wherein: when the soil retaining structure is a foot lifting pile, an inter-pile water stopping structure is arranged between the adjacent foot lifting piles.
CN202010670345.3A 2020-07-13 2020-07-13 Earth-rock binary foundation pit supporting structure system Active CN112049117B (en)

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CN112049117B true CN112049117B (en) 2022-06-07

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Publication number Priority date Publication date Assignee Title
CN112982433A (en) * 2021-02-23 2021-06-18 青岛市勘察测绘研究院 Foundation pit supporting system supported by foot hanging piles and main body structure and construction method

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CN205894086U (en) * 2016-06-29 2017-01-18 广东省重工建筑设计院有限公司 Little decompoed rock layer supporting construction of subway foundation ditch
CN207878473U (en) * 2018-01-30 2018-09-18 北京建材地质工程有限公司 Layer depth foundation pit hangs foot stake supporting construction to Tu Yan in combination
CN209923935U (en) * 2019-03-12 2020-01-10 中铁二院昆明勘察设计研究院有限责任公司 Co-location combined pile wall supporting structure in upper-soft and lower-hard stratum

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