CN213596987U - Soil rock binary foundation ditch hangs foot long short pile support system - Google Patents
Soil rock binary foundation ditch hangs foot long short pile support system Download PDFInfo
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- CN213596987U CN213596987U CN202021366659.6U CN202021366659U CN213596987U CN 213596987 U CN213596987 U CN 213596987U CN 202021366659 U CN202021366659 U CN 202021366659U CN 213596987 U CN213596987 U CN 213596987U
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Abstract
The utility model belongs to the technical field of foundation pit engineering, in particular to a soil-rock binary foundation pit foot hanging long and short pile supporting system, which comprises supporting row piles and a plurality of anchor components; the supporting row piles comprise long foot hanging piles and short foot hanging piles, the bottoms of the long foot hanging piles extend into the 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 slightly weathered rock stratum below the bottom surface of the long foot hanging piles; the bottom of the short foot-hanging pile extends into the middle mineralized rock layer of the soil-rock binary foundation pit. The utility model discloses regard well soil with the stroke ization rock stratum, adopt the mode that long stub combines to realize drawing big good soil scope inter-pile distance purpose to regard as building material with the slightly weathered rock, make full use of slightly weathered rock stratum pit wall self-stabilization, combine multichannel anchor component, form safe, reliable supporting system, at long hanger foot pile bottom and short hanger foot pile bottom all not set up the rock shoulder and inlay fixedly, also need not prestressed anchorage cable lock foot; the outline of the foundation pit is compact.
Description
Technical Field
The utility model belongs to the technical field of foundation ditch engineering, concretely relates to soil rock binary foundation ditch hangs foot long stub support system.
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 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). Due to the fact that the building envelope is difficult to construct in the hard rock stratum, the construction period is long, the construction period of the foundation pit is greatly influenced, and the construction noise of the supporting structure has a large influence on the surrounding environment. To reduce these adverse effects, suspended footwall (pile) and long and short pile technologies have been developed.
The traditional suspended footwall (pile) technical scheme is generally provided with rock shoulders to embed and fix the suspended footwall (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.
According to the traditional long and short pile technical scheme, part of fender piles are embedded in a slightly weathered stratum of a substrate, and the other part of fender piles enter the slightly weathered stratum to a certain depth and then are stopped without being embedded in the substrate stratum, so that although the number of fender piles constructed in a hard stratum is reduced, the problem always exists and is not fully solved.
Disclosure of Invention
In order to overcome the not enough of above-mentioned prior art existence, the utility model aims at providing an earth rock binary foundation ditch hangs foot stub support system can reduce the construction site and occupy, the earthwork excavation and influence all around environment, simplifies the process, and reduction of erection time saves the investment.
In order to achieve the purpose, the technical scheme of the utility model is an earth rock binary foundation pit foot long and short pile supporting system, which comprises supporting row piles and a plurality of anchor components for supporting the supporting row piles; the supporting row piles comprise long foot hanging piles and short foot hanging piles, the bottoms of the long foot hanging piles extend into a slightly weathered rock stratum of the soil-rock binary foundation pit, no rock shoulder is embedded and fixed at the bottoms of the long foot hanging piles, and a steel mesh sprayed concrete surface protection structure is arranged on the slightly weathered rock stratum pit wall below the bottom surface of the long foot hanging piles; the bottom of the short foot-hanging pile extends into a medium-stroke mineralized rock layer of the soil-rock binary foundation pit, and the bottom of the short foot-hanging pile is embedded and fixed without a rock shoulder.
Furthermore, the top of the supporting row pile is provided with a crown beam, the inner side of the supporting row pile is provided with a plurality of waist beams which are arranged from top to bottom at intervals, the uppermost anchor member is supported on the crown beam, and the rest anchor members are respectively supported on the waist beams.
Furthermore, each anchor supporting member is an inner support or a prestressed anchor cable.
Furthermore, the bottom of the long foot-lifting pile is close to the middle plate of one layer of the main structure in the soil-rock binary foundation pit, and the bottom surface of the long foot-lifting pile is not less than 1.5m below the middle plate of the layer close to the bottom of the long foot-lifting pile.
Furthermore, the bottom of the short foot-hanging pile is located above the bottom of the long foot-hanging pile and close to the middle plate located at the other layer of the main structure in the soil-rock binary foundation pit, and the bottom surface of the short foot-hanging pile is located below the middle plate located at the layer close to the bottom of the short foot-hanging pile and is not less than 1.5 m.
Furthermore, a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the pit between the piles of the supporting row piles.
Further, the mesh-reinforced concrete sprayed facing structure comprises a mesh-reinforced concrete hung on the pit wall, concrete sprayed on the mesh-reinforced concrete, 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-reinforced concrete.
Further, the soil nails are inserted obliquely downward into the walls of the slightly weathered rock pits.
Furthermore, among the row of piles of strutting, be equipped with the stagnant water structure between the stake between the adjacent stake.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model considers the medium-stroke chemical rock layer as good soil, and adopts the mode of combining long piles and short piles to realize the purpose of enlarging the pile spacing in the good soil range; the slightly weathered rock is taken as a building material, the bottom of the long foot-hanging pile extends into the slightly weathered rock layer of the soil-rock binary foundation pit, the pit wall of the slightly weathered rock layer is fully utilized for self-stabilization, a safe and reliable supporting system is formed by combining a plurality of anchor components, no rock shoulder is arranged at the bottom of the long foot-hanging pile and the bottom of the short foot-hanging pile for embedding, the contour 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, and the working procedures are simplified;
(2) the utility model discloses do not set up prestressed anchorage cable lock foot at the bottom of long foot pile and short foot pile that hangs, rely on the multichannel to prop up anchor component, strut the campshed and form the overall stable system jointly with major structure, eliminated the underground obstacle effect of prestressed anchorage cable lock foot to the development of later stage underground space.
(3) The bottom of the long foot-lifting pile of the utility model is close to the middle plate of one layer of the main structure in the soil-rock binary foundation pit, and the bottom surface of the long foot-lifting pile is located below the middle plate of one layer close to the bottom of the long foot-lifting pile and is not less than 1.5m, when the main structure needs to be dismantled in the construction process, the bottom surface of the long foot-lifting pile is embedded below the anchor member and is not less than 1.5m below the bottom surface of the middle plate of one layer close to the bottom of the long foot-lifting pile, the middle plate of the main structure close to the bottom of the long foot-lifting pile can play a role in locking the bottom of the long foot-lifting pile; the bottom of the short hanging foot pile of the utility model is positioned above the bottom of the long hanging foot pile and is close to the middle plate positioned at the other layer of the main structure in the soil-rock binary foundation pit, and the bottom surface of the short hanging foot pile is positioned below the middle plate positioned at the bottom of the short hanging foot pile and is not less than 1.5m, when a support anchor component above the bottom surface of the short hanging foot pile needs to be dismantled in the main structure construction process, the bottom surface of the short hanging foot pile is embedded below the support anchor component and is not less than 1.5m below the middle plate positioned at the bottom of the short hanging foot pile, and the middle plate positioned at the bottom of the main structure and is close to the bottom of the short hanging foot pile can play a role in locking the bottom of the short hanging foot pile;
(4) the utility model provides a soil rock binary foundation ditch hangs foot long and short pile support system atress clear and definite, the construction is simple, save investment, reduction of erection time, place occupy for a short time (reducible pipeline moves to change, reduces traffic and dredges work load, reduces to all ring edge borders influence), 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 view of a long and short pile supporting system of a soil-rock binary foundation pit footing provided by the embodiment of the utility model;
in the figure: 1. long hanging foot pile, 2 short hanging foot pile, 3 crown beam, 4 waist beam, 5 inner support, 6 soil nail, 7 concrete, 8 main body structure, 81 bottom plate, 82 middle plate, 83 top plate, 9 inter-pile water stop structure, 10 middle weathered rock stratum top surface, 11 slightly weathered rock stratum top surface.
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, the embodiment provides a long and short pile supporting system for a soil-rock binary foundation pit footing, which includes supporting row piles and a plurality of anchor members for supporting the supporting row piles; the supporting row piles comprise long foot hanging piles 1 and short foot hanging piles 2, the bottoms of the long foot hanging piles 1 extend into the slightly weathered rock layers of the soil-rock binary foundation pits, no rock shoulder is embedded and fixed at the bottoms of the long foot hanging piles 1, and a steel mesh sprayed concrete surface protection structure is arranged on the slightly weathered rock layer pit wall of the foot hanging part below the bottom surfaces of the long foot hanging piles 1; the bottom of the short foot-hanging pile 2 extends into a medium-stroke mineralized rock layer of the soil-rock binary foundation pit, and the bottom of the short foot-hanging pile 2 is embedded and fixed without a rock shoulder. In the embodiment, rock shoulders are not arranged at the bottoms of the long foot hanging piles 1 and the short foot hanging piles 2 for embedding, namely the inner side surfaces of the supporting row piles are flush with the inner side surfaces of the reinforcing mesh sprayed concrete surface protection structure, the mechanical characteristics of rocks are fully utilized, the medium weathered rock stratum is considered as good soil, the purpose of enlarging the distance between piles in the good soil range is realized by adopting a mode of combining the long piles and the short piles, the slightly weathered rocks are considered as building materials, the slightly weathered rock pit wall is fully utilized to be self-stable, a plurality of anchor supporting members are combined, a safe and reliable supporting system is formed, the outline of the foundation pit is compact, the occupation of a construction site is reduced, the influence of earthwork excavation on the surrounding environment is reduced, the working. The stability of the foundation pit in the embodiment is controlled by a supporting system and a hard rock stratum, the number and the arrangement mode of the long foot-hanging piles 1 and the short foot-hanging piles 2 are determined according to the stress requirement, and the interaction of rock soil between the long foot-hanging piles and the short foot-hanging piles are coordinated through a passive side soil body and an enclosing purlin.
Furthermore, the top of the supporting row pile is provided with a crown beam 3, the inner side of the supporting row pile is provided with a plurality of waist beams 4 which are arranged from top to bottom at intervals, the uppermost anchor member is supported on the crown beam 3, and the rest anchor members are respectively supported on the waist beams 4. The top of the long hanging-foot pile 1 and the top of the short hanging-foot pile 2 are connected into a whole through the crown beam 3, the long hanging-foot pile 1 extends into a complete rock stratum (a slightly weathered rock stratum) from the bottom of the crown beam 3 to a certain depth, and the short hanging-foot pile 2 extends into a broken rock stratum (a medium weathered rock stratum) from the bottom of the crown beam 3 to a certain depth.
Furthermore, the bottom of the long suspension foot pile 1 is supported with an anchor member, and the anchor member is positioned on a middle plate layer of the main structure close to the bottom of the long suspension foot pile 1; the bottom of the short foot-lifting pile 2 is supported with a support anchor member, and the support anchor member is positioned on a middle plate at the bottom of the short foot-lifting pile 2 of the main structure, so that the stability of a support system before the main structure 8 is built back is ensured.
Furthermore, each anchor supporting component is one of the inner support 5 or the prestressed anchor cable; the inner support 5 can be a reinforced concrete inner support or a steel pipe inner support; the structural form adopted by each anchor supporting component can be selected according to the specific situation of the site.
Further, the bottom of the long foot-lifting pile 1 is close to the middle plate 82 of one of the layers of the main structure 8 in the soil-rock binary foundation pit, and the bottom surface of the long foot-lifting pile 1 is not less than 1.5m below the bottom surface of the middle plate 82 of the layer close to the bottom of the long foot-lifting pile 1. When the main structure 8 needs a supporting anchor member above the bottom surface of the long foot pile 1 in the construction process of back construction, the bottom surface of the long foot pile 1 is embedded below the supporting anchor member, the main structure 8 which is applied below the supporting anchor member is not less than 1.5m below the bottom surface of the middle plate 82 of the layer which is close to the bottom of the long foot pile 1, at the moment, the middle plate 82 of the layer which is close to the bottom of the long foot pile 1 of the main structure 8 can play a role in locking the bottom of the long foot pile 1, and the stability of supporting row piles is improved.
Further, the bottom of the short foot-hanging pile 2 is located above the bottom of the long foot-hanging pile 1 and close to the middle plate 82 of the other layer of the main structure 8 in the dual-foundation pit of the earth and rock, and the bottom surface of the short foot-hanging pile 2 is located below the bottom surface of the middle plate 82 of the layer close to the bottom of the short foot-hanging pile 2 and is not less than 1.5 m. When the main structure 8 needs to be dismantled one anchor member above the bottom surface of the short hanging foot pile 2 in the construction process of back construction, the bottom surface of the short hanging foot pile 2 is embedded and fixed below the anchor member, the main structure 8 which is applied below the anchor member is close to the bottom of the short hanging foot pile 2, and the bottom surface is not less than 1.5m below the middle plate 82 of the layer of the bottom of the short hanging foot pile 2, at the moment, the middle plate 82 of the layer of the main structure 8 which is close to the bottom of the short hanging foot pile 2 can play a role in locking the bottom of the short hanging foot pile 2, and the stability of supporting row piles is.
In the embodiment, the bottom of the long foot-hanging pile 1 and the bottom of the short foot-hanging pile 2 are not provided with the prestressed anchor cable locking feet, an integral stable system is formed by a plurality of anchor supporting members, a main body structure 8 and supporting row piles together, and the underground obstacle effect of the prestressed anchor cable locking feet on the later-stage underground space development is eliminated; the specific extension of the bottom of the long spud 1 and the bottom of the short spud 2 below the middle plate 82 of the main structure 8 can be determined according to the actual situation.
Furthermore, a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the pit between the piles of the supporting row piles. In this embodiment, the slightly weathered rock stratum pit wall of the hoisting foot part below the bottom surface of the long hoisting foot pile 1 and the pit wall between piles supporting row piles are all protected by concrete sprayed by a steel bar net, so that the flatness of the pit wall is ensured, the side wall of the main structure 8 is conveniently constructed, and meanwhile, crushed rocks and crushed soil can be prevented from entering the foundation pit to influence the construction progress and safety.
Further, the mesh-reinforced concrete sprayed facing structure comprises a mesh reinforcement hung on the pit wall, concrete 7 sprayed on the mesh reinforcement, and a plurality of rows of soil nails 6 inserted into the pit wall, wherein one ends of the soil nails 6 extend out of the pit wall and are embedded in the mesh reinforcement. Further, the soil nails 6 are inserted obliquely downward into the walls of the slightly weathered rock pits. In this embodiment, one end of the soil nail 6 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, among the supporting row piles, an inter-pile water stop structure 9 is arranged between adjacent piles. This embodiment can set up stagnant water structure 9 between the stake between adjacent stake according to the actual requirement of foundation ditch upper portion stratum, improves water-proof effects.
The subway station main body foundation pit shown in fig. 1 is located in a green belt on the east side of a road in a Guangzhou city Tianhe area, and is in a north-south direction along the Guangzhou road, the line spacing of a station main body standard section is 17m, the total length of the station is 514.660m, the station main body foundation pit consists of a full open digging section, a half cover digging section and a hidden digging section, and the width of the standard section foundation pit is 23.1 m. The thickness of the covering soil is 5.83-6.69 m, and the depth of the foundation pit is about 31.53-33.18 m. The rock soil layer in the field is sequentially 8 large layers including an artificial filling layer, a scouring-flooding phase sand layer, a silty clay layer, a residual layer, a rock full weathering zone, a strong weathering zone, a medium weathering zone and a micro weathering zone from top to bottom. Wherein the length of the full open cut section is about 70m, the depth of the foundation pit is about 31.6m, and the burial depth of the slightly weathered conglomerate is shallow. The foundation pit section adopts the long and short pile supporting system of the soil-rock binary foundation pit lifting foot provided by the embodiment, wherein supporting row piles are arranged at intervals of one long and one short, and phi 1200@1400mm fender piles and four inner supports 5 are adopted. The short hanging foot pile 2 extends into the middle petrochemical stratum from the bottom of the crown beam 3, the pile bottom is positioned at a position 1.5m below the bottom surface of the middle plate 82 in the underground layer of the main structure of the station, and the pile length is about 14.5 m; the long lifting foot pile 1 extends into the slightly weathered rock stratum from the bottom of the crown beam 3, the pile bottom is positioned at a position 1.5m below the bottom surface of the middle plate 82 in the second layer of the main structure of the station, and the pile length is about 23 m; the first inner support 5 is a reinforced concrete inner support, and the second to fourth inner supports 5 are phi 600 steel pipe inner supports; the height of the vertical pit wall of the slightly weathered rock surface of the lifting foot part below the bottom surface of the long lifting foot pile 1 is about 7.4m, a concrete surface is sprayed by adopting a hanging reinforcing mesh, the pit wall of the upper pile pit is also sprayed by adopting a hanging reinforcing mesh, and water is stopped between piles by adopting a phi 600 double-pipe jet grouting pile. The foundation pit combines geology and peripheral conditions, adopts a long and short pile with lifting feet and an inner support supporting system to meet the design requirements of the foundation pit, simplifies the construction process, saves the construction period, 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 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 (9)
1. The utility model provides an earth rock binary foundation ditch hangs foot long-short pile support system which characterized in that: the device comprises a supporting row pile and a plurality of supporting anchor components for supporting the supporting row pile; the supporting row piles comprise long foot hanging piles and short foot hanging piles, the bottoms of the long foot hanging piles extend into the slightly weathered rock layer of the soil-rock binary foundation pit, no rock shoulder is embedded and fixed at the bottoms of the long foot hanging piles, and a steel mesh sprayed concrete surface protection structure is arranged on the slightly weathered rock layer pit wall below the bottom surface of the long foot hanging piles; the bottom of the short foot-hanging pile extends into a medium-stroke mineralized rock layer of the soil-rock binary foundation pit, and the bottom of the short foot-hanging pile is embedded and fixed without a rock shoulder.
2. The soil-rock binary foundation pit foot long and short pile supporting system of claim 1, characterized in that: the top of the supporting row pile is provided with a crown beam, the inner side of the supporting row pile is provided with a plurality of waist beams which are arranged at intervals from top to bottom, the uppermost anchor member is supported on the crown beam, and the rest anchor members are respectively supported on the waist beams.
3. The soil-rock binary foundation pit foot long and short pile supporting system of claim 1 or 2, characterized in that: each branch anchor component is an inner support or a prestressed anchor cable.
4. The soil-rock binary foundation pit foot long and short pile supporting system of claim 1, characterized in that: the bottom of the long foot-lifting pile is close to the middle plate of one layer of the main body structure in the soil-rock binary foundation pit, and the bottom surface of the long foot-lifting pile is not less than 1.5m below the middle plate of the layer close to the bottom of the long foot-lifting pile.
5. The soil-rock binary foundation pit foot long and short pile supporting system of claim 4, characterized in that: the bottom of the short foot-hanging pile is positioned above the bottom of the long foot-hanging pile and is close to the middle plate positioned at the other layer of the main body structure in the soil-rock binary foundation pit; the bottom surface of the short foot-hanging pile is located below a middle plate layer close to the bottom of the short foot-hanging pile and is not less than 1.5 m.
6. The soil-rock binary foundation pit foot long and short pile supporting system of claim 1, characterized in that: and a steel bar mesh sprayed concrete surface protection structure is arranged on the wall of the pit between the piles of the supporting row piles.
7. The soil-rock binary foundation pit foot long and short pile supporting system of claim 1 or 6, characterized in that: 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.
8. The soil-rock binary foundation pit foot long and short pile supporting system of claim 7, characterized in that: the soil nails are obliquely and downwards inserted into the walls of the slightly weathered rock stratum pits.
9. The soil-rock binary foundation pit foot long and short pile supporting system of claim 1, characterized in that: in the supporting row piles, an inter-pile water stop structure is arranged between adjacent piles.
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| CN202021366659.6U CN213596987U (en) | 2020-07-13 | 2020-07-13 | Soil rock binary foundation ditch hangs foot long short pile support system |
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