CN114622569A - Pile top structure with foundation pit supporting and blocking and basement anti-floating function - Google Patents
Pile top structure with foundation pit supporting and blocking and basement anti-floating function Download PDFInfo
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- CN114622569A CN114622569A CN202210055081.XA CN202210055081A CN114622569A CN 114622569 A CN114622569 A CN 114622569A CN 202210055081 A CN202210055081 A CN 202210055081A CN 114622569 A CN114622569 A CN 114622569A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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Abstract
The invention relates to the technical field of pile top structure construction, and discloses a pile top structure with a foundation pit support and a basement anti-floating function, which comprises a plurality of cast-in-place piles, wherein the upper parts of the cast-in-place piles are provided with exposed sections, the exposed sections form chiseled areas, and horizontal planting bars are inserted into the exposed sections; a fore shaft beam is arranged on the chiseling area, fore shaft beam reinforcing steel bars welded with the anchoring reinforcing steel bars are arranged in the fore shaft beam, and an outer protruding part is formed at the outer side part of the fore shaft beam; a retaining wall abutting against the free face of the exposed section is arranged in the chiseling area, retaining wall reinforcing steel bars are arranged in the retaining wall, the lower ends of the retaining wall reinforcing steel bars are arranged in the locking notch beams, and the anchoring reinforcing steel bars extend into the retaining wall; be equipped with the basement in the foundation ditch, the fore shaft roof beam is being supported to the outer wall of basement from bottom to top, utilizes retaining wall to prop up the fender soil body temporarily, guarantees that the foundation ditch can not landslide, collapse, and the fore shaft roof beam is connected with the outer wall anchor of basement, and when the basement received groundwater buoyancy and floats, the fore shaft roof beam gave the great counter-force of basement outer wall, has guaranteed the anti safety of floating of basement.
Description
Technical Field
The invention relates to the technical field of pile top structure construction, in particular to a pile top structure with a foundation pit supporting and blocking function and basement anti-floating function.
Background
Generally, in a common foundation pit project, in order to save manufacturing cost, a support pile and an inner support are arranged for supporting after a proper slope is placed on the upper portion of a foundation pit, however, in the foundation pit project adjacent to a building, because a slope placing space is not provided, and meanwhile, in order to protect the building, the deformation of the building such as settlement and inclination caused by excavation of the foundation pit is avoided, a pile top is usually arranged on the ground, so that the construction has the defect that because the pile top is positioned on the ground and a slope placing section is not provided, the length of the support pile above the pit bottom of the foundation pit is increased, and because the length of the support pile is longer, more layers of inner supports are often required to be arranged, and the safety of the foundation pit and the pit top building can be ensured. The pile top is arranged on the ground, on one hand, the construction cost is increased due to the arrangement of more inner supports, and on the other hand, the construction period is finally increased due to the fact that the inner supports are installed in a layering mode in the layered excavation of the foundation pit.
People sometimes reduce one or more layers of inner supports in order to reduce construction cost and accelerate construction period, but the position of a locking beam at the top of the support pile needs to be lowered. Therefore, one-layer inner support or multiple-layer inner support is reduced, but the bottom of the locking notch beam needs to be excavated during the construction of the locking notch beam and the inner support of the pile top, so that the earth side slope on the upper part of the locking notch beam of the pile top is in a non-support state. The non-support exposed state can be finished after the construction of the fore shaft beam and the reinforced concrete retaining wall on the upper part of the fore shaft beam is finished and medium coarse sand is backfilled behind the wall after the maintenance of the retaining wall meets the age requirement. Therefore, the side slope above the pile top is always in a non-support state from the beginning of excavation of the pile top to the construction of the locking beam, maintenance of the locking beam, construction of the retaining wall of the pile top, maintenance of the retaining wall, backfill of the retaining wall after the retaining wall and the like, so that landslide and collapse are easy to occur, and the pit top building is deformed.
In order to ensure the stability of a foundation pit above a pile top during backfilling from the excavation of the foundation pit to a pile top wall, the conventional method is to adopt a mode of driving and establishing a temporary support of a steel sheet pile and construct the foundation pit according to the following procedures:
1) firstly, constructing a support pile and a water stop pile on the ground, wherein the pile top is positioned at a certain depth below the ground, a part of hollow piles are reserved at the upper part, and coarse sand in the part of the hollow piles is backfilled after the construction is finished;
2) inserting and driving a row of steel sheet piles to be close to the support piles outside the support piles for temporary support;
3) then, downward excavation is started, the pile head is excavated, floating slurry is chiseled to the bottom of the fore shaft beam, the anchoring reinforcing steel bars are exposed, and then the fore shaft beam and the first inner supporting beam are constructed;
4) constructing a reinforced concrete retaining wall on the upper part of the fore shaft, removing the temporary steel sheet pile after the wall is maintained to reach the designed strength, and backfilling coarse sand in the hole left by the removed steel sheet pile;
5) and excavating in layers and constructing the supporting beam to the bottom of the pit.
Although the problem of temporary support of foundation pit above pile top has been solved to a certain extent to the technology among the prior art, nevertheless owing to need insert and beat the steel sheet pile, and the later stage still needs pull out the steel sheet pile, the hole that leaves the soil body after pulling out the steel sheet pile adopts well coarse sand backfill simultaneously, therefore the construction is troublesome, construction period is longer, and adopt well coarse sand backfill, can not guarantee to backfill closely knit, lead to the foundation pit top lateral wall soil body still loose, long-term foundation pit consolidation settlement effect leads to the soil body to warp very easily and then causes the pit top building to subside or warp.
The pile top structure formed by the existing construction process has the defects of troublesome construction and instability.
Disclosure of Invention
The invention aims to provide a pile top structure with a foundation pit support and a basement anti-floating function, and aims to solve the problems that in the prior art, the pile top structure is troublesome to construct and unstable.
The invention is realized in this way, and has the foundation pit retaining and anti-floating pile top structure of the basement at the same time, including a plurality of bored concrete piles surrounding the periphery of the foundation pit at intervals, the top of the bored concrete pile is located on the ground; the upper part of the cast-in-place pile is provided with an exposed section, a chiseling area is formed on the exposed section towards the inner side part of the foundation pit, anchoring reinforcing steel bars in the cast-in-place pile extend into the chiseling area, horizontal planting bars are inserted into the exposed section, and the horizontal planting bars penetrate through the chiseling area and extend into the foundation pit; a locking beam is arranged on the chiseling-out area, and reinforcing steel bars of the locking beam are arranged along the periphery of the foundation pit and abut against the bottom of the chiseling-out area; the fore shaft beam is provided with fore shaft beam steel bars, and the fore shaft beam steel bars are welded with the anchoring steel bars; the outer side part of the fore shaft beam expands outwards towards the inside of the foundation pit to form an outward protruding part positioned outside the chiseling area; the exposed section is provided with a blank surface facing the chiseled area; a retaining wall is arranged in the chiseling area and abuts against the free face of the exposed section of the cast-in-place pile; the retaining wall is internally provided with retaining wall reinforcing steel bars, the lower ends of the retaining wall reinforcing steel bars are arranged in the fore shaft beam, the upper ends of the retaining wall reinforcing steel bars extend upwards, and the anchoring reinforcing steel bars extend into the retaining wall; the foundation pit is provided with a basement, and the outer wall of the basement is abutted against the fore shaft beam from bottom to top and is connected with the outward protruding part of the fore shaft beam in an anchoring mode.
Furthermore, outer wall reinforcing steel bars are arranged in the outer wall of the basement, and the outer wall reinforcing steel bars extend out of the top of the outer wall of the basement; the outer wall reinforcing steel bars extend from the bottom of the fore shaft beam in an upward bending mode, surround the periphery of the fore shaft beam and are bound and anchored with the fore shaft beam.
Furthermore, the outer wall steel bars are enclosed and surround the periphery of the fore shaft beam.
Further, the basement includes a substructure below the fore shaft and a superstructure on top of the substructure; the outer periphery of the substructure forms the outer wall, the outer wall being offset from the outer periphery of the superstructure and disposed toward the fore-aft beam; a space is provided between the fore shaft beam and the periphery of the superstructure; the embedded obturator in the interval, the internal interval reinforcing bar that has of obturator, the lower part of interval reinforcing bar with outer wall steel bar welding, the upper portion of interval reinforcing bar by the top of fore shaft roof beam is crooked extension down, encircles the periphery of fore shaft roof beam, with fore shaft roof beam ligature anchor.
Furthermore, a plurality of inserting blocks are arranged on the retaining wall reinforcing steel bars, the inner ends of the inserting blocks are arranged in the retaining wall, the outer ends of the inserting blocks extend out of the retaining wall to form embedding sections, and the embedding sections are embedded in the side wall of the foundation pit.
Further, the embedding section has an upper end face arranged upward and a lower end face arranged downward, the upper end face of the embedding section is arranged obliquely downward in the extending direction toward the side wall of the foundation pit, and the lower end face of the embedding section is arranged obliquely downward.
Further, the angle at which the lower end surface of the embedded section is inclined downward is smaller than the angle at which the upper end surface of the embedded section is inclined downward.
Furthermore, a positioning groove is formed in the inner end of the embedding section, connecting reinforcing steel bars are wound among the inserting blocks, the connecting reinforcing steel bars are embedded into the positioning groove of the embedding section, and a net-shaped structure is formed among the inserting blocks by the connecting reinforcing steel bars; the connecting reinforcing steel bars are attached between the empty face of the exposed section and the outer side face of the retaining wall.
Furthermore, the up end of embedding section is provided with the back-pull thorn, the lower extreme of back-pull thorn is connected the up end of embedding section, the upper end of back-pull thorn deviates from the lateral wall slope extension of foundation ditch, just the back-pull interval has between the upper end of back-pull thorn and the up end of embedding section.
Furthermore, a water stop pile is arranged between the cast-in-place piles, and the side part of the water stop pile and the side part of the adjacent cast-in-place pile are connected into a whole in an embedded mode.
Compared with the prior art, the pile top structure with the foundation pit supporting and blocking function and the basement anti-floating function is characterized in that a chiseled area chiseled out by the cast-in-place pile is utilized to construct and form a temporary supporting and blocking soil body of the retaining wall, so that the foundation pit is prevented from landslide and collapse, meanwhile, the anchoring steel bars of the chiseled area extend to the inside of the retaining wall, the retaining wall abuts against the free face of the cast-in-place pile, and the retaining wall and the cast-in-place pile form a stable supporting and blocking structure; when the ascending construction basement of successive layer, with top supporting beam and lower floor's supporting beam cutting off, remain the fore shaft roof beam, the fore shaft roof beam is connected with the outer wall anchor of basement, receives groundwater buoyancy when floating when the basement, and the fore shaft roof beam gives the great counter-force of basement outer wall, has guaranteed the anti safety of floating of basement.
Drawings
FIG. 1 is a sectional view of a cast-in-place pile constructed around a foundation pit according to the present invention;
FIG. 2 is a cross-sectional view of the present invention providing a chiseled area in the exposed section of the cast-in-place pile;
FIG. 3 is a schematic cross-sectional view of the present invention providing a locking collar beam, a top support beam and a retaining wall;
FIG. 4 is a sectional view of the present invention for excavating a foundation pit and constructing a basement;
FIG. 5 is a schematic cross-sectional view of the cast-in-place pile, retaining wall, fore shaft and top support beam connection provided by the present invention;
FIG. 6 is a schematic representation of the rebar connections between the exposed section of the cast-in-place pile, the retaining wall, the fore-shaft beams, and the top support beams provided by the present invention;
FIG. 7 is a schematic view of the present invention providing a connection between a catcher beam and an exterior wall of a basement;
FIG. 8 is a schematic front view of the wrapping of the reinforcing bars of the exterior wall with the fore shaft provided by the present invention;
FIG. 9 is a schematic front view of the spacer bar being wrapped around a fore sill provided by the present invention;
fig. 10 is a schematic front view of an insert block provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-10, preferred embodiments of the present invention are provided.
The pile top structure with the foundation pit retaining and the basement anti-floating function comprises a plurality of cast-in-place piles 100 which surround the periphery of the foundation pit at intervals, and the tops of the cast-in-place piles 100 are located on the ground; the upper portion of bored concrete pile 100 has exposed section 101, and exposed section 101 is formed with chiseled area 102 towards the inside portion of foundation ditch, and the inside anchor reinforcing bar 103 of bored concrete pile 100 extends to in chiseled area 102, and horizontal bar planting 104 is inserted and is established to exposed section 101, and horizontal bar planting 104 passes chiseled area 102, extends to the inside of foundation ditch.
The chiseling-off region 102 is provided with a fore shaft beam 200, and the fore shaft beam 200 is arranged along the periphery of the foundation pit and abuts against the bottom of the chiseling-off region 102; the fore shaft beam 200 is provided with fore shaft beam steel bars, and the fore shaft beam steel bars are welded with the anchoring steel bars 103; the outer side of the fore shaft 200 is flared toward the inside of the foundation pit to form an outer protrusion outside the chiseled region.
The exposed segment 101 has a free face facing towards the gouging area 102; a retaining wall 300 is arranged in the chiseling-out area 102, and the retaining wall 300 is abutted against the free face of the exposed section 101 of the cast-in-place pile 100; retaining wall reinforcing steel bars are arranged in the retaining wall 300, the lower ends of the retaining wall reinforcing steel bars are arranged in the fore shaft beam 200, the upper ends of the retaining wall reinforcing steel bars extend upwards, and the anchoring reinforcing steel bars 103 extend into the retaining wall 300; the basement 500 is arranged in the foundation pit, the outer wall of the basement 500 abuts against the fore shaft beam 200 from bottom to top and is connected with the outward protruding part of the fore shaft beam 200 in an anchoring mode.
According to the pile top structure with the foundation pit supporting and retaining functions and the basement anti-floating function, the chiseling-off area 102 chiseled off by the cast-in-place pile 100 is utilized, a retaining wall 300 temporary supporting and retaining soil body is formed in the chiseling-off area 102, the foundation pit is prevented from landslide and collapse, meanwhile, the anchoring steel bars 103 of the chiseling-off area 102 extend into the retaining wall 300, the retaining wall 300 abuts against the free face of the cast-in-place pile 100, and the retaining wall 300 and the cast-in-place pile 100 form a stable supporting and retaining structure; the fore shaft 200 is connected with the outer wall of the basement 500 in an anchoring manner, when the basement 500 floats upwards under the buoyancy of underground water, the fore shaft 200 gives a larger counter force to the outer wall of the basement 500, and the anti-floating safety of the basement 500 is guaranteed.
The embodiment also provides a construction method of the pile top structure with the foundation pit retaining and the basement anti-floating function, which comprises the following construction steps:
1) constructing a plurality of filling piles 100 which are arranged at intervals around the periphery of a foundation pit on the ground adjacent to the periphery of the foundation pit of the building, wherein the tops of the filling piles 100 are positioned on the ground;
drilling holes by a drilling machine to form cast-in-place pile holes, installing a reinforcement cage, pouring concrete to the designed pile top position, and then continuously excavating after the maintenance of the cast-in-place pile 100 reaches the designed strength;
2) excavating a foundation pit from the ground downwards until the position of a fore shaft beam 200 to be constructed, wherein in the excavation process, the cast-in-place pile 100 is provided with an exposed section 101, namely, in the process of excavating the foundation pit, the top part of the cast-in-place pile 100 is exposed along with the excavation of a soil body to form the exposed section 101;
chiseling concrete of an exposed section 101 of a cast-in-place pile 100 towards the inner side of a foundation pit to form a chiseled area 102, wherein anchoring steel bars 103 inside the cast-in-place pile 100 are exposed in the chiseled area 102; the portion of the exposed section 101 of the cast-in-place pile 100 is cut out of concrete, but the anchoring bars 103 in the cut-out portion remain;
3) adjusting the anchoring steel bars 103 of the chiseled area 102 to be vertical, horizontally drilling holes in the exposed section 101 of the cast-in-place pile 100 to form horizontal holes, inserting horizontal embedded bars 104 into the horizontal holes, and enabling the horizontal embedded bars 104 to penetrate through the chiseled area 102 and extend into the foundation pit;
4) binding a fore shaft beam reinforcing steel bar, welding the fore shaft beam reinforcing steel bar with the anchoring reinforcing steel bar 103 in the chiseled-out area 102, and connecting the fore shaft beam reinforcing steel bar and the anchoring reinforcing steel bar 103 into a whole; the locking beam steel bars are arranged along the periphery of the foundation pit and abut against the bottom of the chiseling area 102; binding supporting beam reinforcing steel bars, wherein the supporting beam reinforcing steel bars cross the foundation pit, and the end parts of the supporting beam reinforcing steel bars are welded with the horizontal embedded steel bars 104; pouring concrete on the outside formwork of the fore shaft beam reinforcing steel bars and the supporting beam reinforcing steel bars to form a fore shaft beam 200 and a top supporting beam 201, wherein the outer side part of the fore shaft beam 200 is expanded towards the inside of the foundation pit to form an outer protrusion part positioned outside the chiseled area 102;
5) the exposed section 101 of the cast-in-place pile 100 has a free face facing towards the chiseled-out area 102; the vertical retaining wall reinforcing bars of arranging are ligatured in chiseling out regional 102, and inside the fore shaft 200 was arranged in to the lower extreme of retaining wall reinforcing bars, the upper end of retaining wall reinforcing bars extended up, at the outside formwork concreting of retaining wall reinforcing bars, formed retaining wall 300, retaining wall 300 butt is at the face free face of the section 101 that shows of bored concrete pile 100, and anchor reinforcing bars 103 extends to inside the retaining wall 300.
6) Downwards excavating a foundation pit, and constructing a lower layer support beam until the lower layer support beam is excavated to the bottom of the foundation pit;
7) and constructing the basement 500 at the bottom of the foundation pit upwards, sequentially cutting off the lower-layer supporting beam and the top supporting beam 201, abutting the fore shaft beam 200 on the outer wall of the basement 500 from bottom to top, and anchoring and connecting the outer protruding part of the fore shaft beam 200.
Utilizing the chiseled area 102 chiseled by the cast-in-place pile 100 to construct and form a retaining wall 300 to temporarily support and block soil, ensuring that a foundation pit cannot slide and collapse, meanwhile, the anchoring steel bars 103 of the chiseled area 102 extend into the retaining wall 300, the retaining wall 300 is abutted against the blank surface of the cast-in-place pile 100, and the retaining wall 300 and the cast-in-place pile 100 form a stable supporting and blocking structure; when the basement 500 is upwards constructed layer by layer, the top supporting beam 201 and the lower supporting beam are cut off, the fore shaft beam 200 is reserved, the fore shaft beam 200 is connected with the anchoring of the outer wall of the basement 500, when the basement 500 floats upwards under the buoyancy of underground water, the fore shaft beam 200 gives greater counterforce to the outer wall of the basement 500, and the anti-floating safety of the basement 500 is guaranteed.
The foundation pit supporting structure has a foundation pit supporting and retaining and basement anti-floating pile top structure, integrates a part of foundation pit supporting structure above a cast-in-place pile 100 and later stage basement 500 anti-floating, and has two functions of foundation pit supporting above the cast-in-place pile 100 and basement 500 anti-floating.
An outer wall steel bar 503 is arranged in the outer wall of the basement 500, and the outer wall steel bar 503 extends out of the top of the outer wall of the basement 500; the exterior wall reinforcing steel bars 503 are bent upwards from the bottom of the fore shaft beam 200, surround the periphery of the fore shaft beam 200, and are bound and anchored with the fore shaft beam 200.
Thus, the structure between the outer wall of the basement 500 and the fore shaft beam 200 is more stable and integrated, and the anti-floating safety of the basement 500 is further ensured.
The exterior wall reinforcement 503 is closed around the periphery of the fore shaft 200.
The basement 500 includes a substructure 502 located below the shackle beam 200 and a superstructure 501 located on top of the substructure 502; the periphery of the substructure 502 forms the aforementioned outer wall, which is offset from the periphery of the superstructure 501, and is arranged towards the shackle beam 200, with a space 203 between the shackle beam 200 and the periphery of said superstructure 501.
Binding spacing steel bars 204 in the spacing 203, welding the lower parts of the spacing steel bars 204 with the outer wall steel bars 503, bending and extending the upper parts of the spacing steel bars 204 downwards from the top of the fore shaft beam 200, surrounding the periphery of the fore shaft beam 200, and binding and anchoring with the fore shaft beam 200; concrete is poured into the space to form a filler body embedded in the space 203.
In this way, by binding the spacer bars 204 in the space 203, the filling body embedded in the space 203 is constructed and molded, and the spacer bars 204 are welded integrally with the outer wall bars 503, and at the same time, the spacer bars 204 are bent downward to surround the outer circumference of the fore shaft 200, so that the filling body is formed integrally with the fore shaft 200.
In addition, the directions of the spacing steel bars 204 and the bending surrounding of the exterior wall steel bars 503 are opposite, and the spacing steel bars and the bending surrounding locking notch beam 200 can apply abutting force to the locking notch beam 200 from top to bottom, so that the exterior wall and the filling body of the basement 500 are integrated with the locking notch beam 200 from top to bottom respectively, and the three are connected into a whole in a transition and stable mode by taking the locking notch beam 200 as a middle.
Be provided with a plurality of inserted blocks on the retaining wall reinforcing bar, inside the inner of inserted block placed in retaining wall 300, the outer end of inserted block extends retaining wall 300, forms embedding section 706, and embedding section 706 imbeds in the lateral wall of foundation ditch. Like this, retaining wall 300 not only forms as an organic whole with bored concrete pile 100, and during the inserted block embedding of retaining wall reinforcing bar was in the soil body of foundation ditch, can form retaining wall 300 and the soil body of foundation ditch integratively, and applyed outward pressure for the soil body of foundation ditch, better avoids the foundation ditch problem that landslide or collapse appear.
The insertion section 706 has an upwardly disposed upper end face 704 and a downwardly disposed lower end face 705, the upper end face 704 of the insertion section 706 being disposed obliquely downwards and the lower end face 705 of the insertion section 706 being disposed obliquely downwards in the direction of extension towards the side wall of the foundation pit. Like this, whole embedding section 706 is the crooked arrangement of slope down, and when embedding section 706 inserts back in the soil body of foundation ditch, can top-down anchor the soil body, avoids the foundation ditch soil body to give retaining wall 300 extra impact force, better support foundation ditch.
The angle at which the lower end surface 705 of the embedment section 706 is inclined downwardly is less than the angle at which the upper end surface 704 of the embedment section 706 is inclined downwardly so that the embedment section 706 provides a better anchorage of the embedment section 706 to the soil.
The inner end of the embedding section 706 is provided with a positioning groove 703, connecting steel bars are wound among the plurality of inserting blocks, the connecting steel bars are embedded in the positioning groove 703 of the embedding section 706, and a net-shaped structure is formed among the plurality of inserting blocks by the connecting steel bars; after the retaining wall 300 is poured, the connecting steel bars are attached between the free surface of the exposed section 101 and the outer side surface of the retaining wall 300.
Through the winding connection of connecting reinforcement and the constant head tank 703 of a plurality of embedding sections 706, connecting reinforcement forms network structure, thus, a plurality of embedding sections 706 then form overall structure through connecting reinforcement, and network structure's connecting reinforcement is supported and is being exposed the face empty face of section 101, strengthen a plurality of embedding sections 706 and form the whole anchor steadiness with the soil body, when local impact appears in the soil body that retaining wall 300 strutted, because a plurality of embedding sections 706 pass through connecting reinforcement and form overall structure, thereby the phenomenon that local break away from the soil body can not appear in a plurality of embedding sections 706.
The upper end face of the embedding section 706 is provided with a reverse-pulling spine 701, the lower end of the reverse-pulling spine 701 is connected to the upper end face 704 of the embedding section 706, the upper end of the reverse-pulling spine 701 extends obliquely away from the side wall of the foundation pit, and a reverse-pulling interval 702 is formed between the upper end of the reverse-pulling spine 701 and the upper end face 704 of the embedding section 706.
Like this, through forming back-pull thorn 701 for the embedding section 706 can be more firm with the anchor between the soil body, and back-pull interval 702 has between the up end of back-pull thorn 701 and embedding section 706, and the soil body can be embedded into back-pull interval 702, and like this, then form the anchor of multiple embedding between embedding section 706 and the soil body, make to be connected more firm between embedding section 706 and the soil body.
Constructing a plurality of water-stopping piles 400 which are arranged around the periphery of the foundation pit at intervals on the ground around the foundation pit of the adjacent building, wherein the top of the cast-in-place pile 100 is positioned on the ground; the side of the water stop pile 400 is connected with the side of the adjacent cast-in-place pile 100 in an embedded manner.
When need excavate near neighbouring building, before the excavation at first construct bored concrete pile 100 and the stagnant water stake 400 between bored concrete pile 100, bored concrete pile 100 generally is reinforced concrete drilling bored concrete pile 100, stagnant water stake 400 generally is the rotatory slip casting stake of spraying of high pressure, bored concrete pile 100 and stagnant water stake 400 interlock each other and make up for having concurrently and strut and stagnant water dual function's a fender pile structure, simultaneously, later stage basement 500 and fore shaft 200 anchor are in the same place, when basement 500 receives the buoyancy of groundwater and floats, the uplift force of bored concrete pile 100 itself can guarantee that basement 500 structure can not come up the deformation or destroy.
In this embodiment, after the cast-in-place piles 100 are maintained to meet the design strength requirement, the high-pressure jet grouting water-stopping piles 400 are drilled between adjacent cast-in-place piles 100, and then excavation can be continued after the water-stopping piles 400 are maintained to reach the design strength.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The pile top structure is characterized by comprising a plurality of cast-in-place piles surrounding the periphery of the foundation pit at intervals, wherein the tops of the cast-in-place piles are positioned on the ground; the upper part of the cast-in-place pile is provided with an exposed section, a chiseling area is formed on the exposed section towards the inner side part of the foundation pit, anchoring reinforcing steel bars in the cast-in-place pile extend into the chiseling area, horizontal planting bars are inserted into the exposed section, and the horizontal planting bars penetrate through the chiseling area and extend into the foundation pit; a locking beam is arranged on the chiseling-out area, and reinforcing steel bars of the locking beam are arranged along the periphery of the foundation pit and abut against the bottom of the chiseling-out area; the fore shaft beam is provided with fore shaft beam steel bars, and the fore shaft beam steel bars are welded with the anchoring steel bars; the outer side part of the fore shaft beam expands outwards towards the inside of the foundation pit to form an outward protruding part positioned outside the chiseling area; the exposed section is provided with a blank surface facing the chiseled area; a retaining wall is arranged in the chiseling area and abuts against the free face of the exposed section of the cast-in-place pile; the retaining wall is internally provided with retaining wall reinforcing steel bars, the lower ends of the retaining wall reinforcing steel bars are arranged in the fore shaft beam, the upper ends of the retaining wall reinforcing steel bars extend upwards, and the anchoring reinforcing steel bars extend into the retaining wall; the foundation pit is provided with a basement, and the outer wall of the basement is abutted against the fore shaft beam from bottom to top and is connected with the outward protruding part of the fore shaft beam in an anchoring mode.
2. The pile top structure with the foundation pit support and the basement as claimed in claim 1, wherein an outer wall steel bar is arranged in the outer wall of the basement, and the outer wall steel bar extends out of the top of the outer wall of the basement; the outer wall reinforcing steel bars extend from the bottom of the fore shaft beam in an upward bending mode, surround the periphery of the fore shaft beam and are bound and anchored with the fore shaft beam.
3. The pile top structure with the foundation pit retaining and the basement anti-floating function as claimed in claim 2, wherein the outer wall steel bars are closely surrounded on the periphery of the fore shaft beam.
4. The pile top structure with both foundation pit retaining and basement anti-floating of claim 2, wherein the basement includes a substructure below the fore shaft and a superstructure on top of the substructure; the outer periphery of the substructure forms the outer wall, the outer wall being offset from the outer periphery of the superstructure and disposed toward the fore-aft beam; a space is provided between the fore shaft beam and the periphery of the superstructure; the embedded obturator in the interval, the internal interval reinforcing bar that has of obturator, the lower part of interval reinforcing bar with outer wall steel bar welding, the upper portion of interval reinforcing bar by the top of fore shaft roof beam is crooked extension down, encircles the periphery of fore shaft roof beam, with fore shaft roof beam ligature anchor.
5. The pile top structure with the foundation pit retaining and the basement anti-floating function as claimed in any one of claims 1 to 4, wherein a plurality of insertion blocks are arranged on the retaining wall reinforcing steel bars, the inner ends of the insertion blocks are arranged inside the retaining wall, the outer ends of the insertion blocks extend out of the retaining wall to form an embedded section, and the embedded section is embedded in the side wall of the foundation pit.
6. The pile top structure with both foundation pit support and basement anti-floating function as claimed in claim 5, wherein said embedded section has an upper end face disposed upward and a lower end face disposed downward, the upper end face of said embedded section is disposed obliquely downward and the lower end face of said embedded section is disposed obliquely downward in the extending direction toward the side wall of the foundation pit.
7. The pile top structure with both foundation pit support and basement anti-floating function of claim 6, wherein the angle of downward inclination of the lower end face of the embedded section is smaller than the angle of downward inclination of the upper end face of the embedded section.
8. The pile top structure with the foundation pit retaining and the basement anti-floating functions as claimed in claim 7, wherein a positioning groove is formed in the inner end portion of the embedding section, connecting steel bars are wound among the plurality of the inserting blocks, the connecting steel bars are embedded in the positioning groove of the embedding section, and the connecting steel bars form a net structure among the plurality of the inserting blocks; the connecting reinforcing steel bars are attached between the empty face of the exposed section and the outer side face of the retaining wall.
9. The pile top structure with the foundation pit support and the basement anti-floating function as claimed in claim 7, wherein the upper end face of the embedded section is provided with an inverted pull thorn, the lower end of the inverted pull thorn is connected to the upper end face of the embedded section, the upper end of the inverted pull thorn extends obliquely away from the side wall of the foundation pit, and an inverted pull interval is formed between the upper end of the inverted pull thorn and the upper end face of the embedded section.
10. The pile top structure with the foundation pit support and the basement anti-floating function as claimed in any one of claims 1 to 4, wherein a water-stopping pile is arranged between the cast-in-place piles, and the side part of the water-stopping pile is embedded and connected with the side part of the adjacent cast-in-place pile into a whole.
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| CN202210055081.XA CN114622569B (en) | 2022-01-18 | 2022-01-18 | Pile top structure with foundation pit supporting and retaining functions and basement anti-floating function |
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| CN114622569B (en) | 2023-07-25 |
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