CN113605398B - Foundation pit supporting mechanism - Google Patents
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- CN113605398B CN113605398B CN202110796086.3A CN202110796086A CN113605398B CN 113605398 B CN113605398 B CN 113605398B CN 202110796086 A CN202110796086 A CN 202110796086A CN 113605398 B CN113605398 B CN 113605398B
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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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Abstract
The invention relates to a foundation pit supporting mechanism which comprises a plurality of cast-in-place piles, a plurality of supporting rods and a plurality of supporting rods, wherein a virtual curve path is arranged along the edge of a foundation pit, the curve path comprises a plurality of unit convex curves protruding towards the direction close to the center of the foundation pit, the unit convex curves are sequentially connected end to end, and the cast-in-place piles are sequentially arranged at intervals along the curve path; the front-end crown beam is positioned in the plurality of cast-in-place piles on the same unit convex curve, the cast-in-place pile closest to the center of the foundation pit is a front-end pile, and the front-end crown beam is connected with the plurality of front-end piles; the rear-end crown beam is positioned in the plurality of cast-in-place piles on the same unit convex curve, the cast-in-place pile farthest away from the center of the foundation pit is a rear-end pile, and the rear-end crown beam is connected with the plurality of rear-end piles; the middle crown beam, the front end pile and the rear end pile which are adjacent along the curved path, and each cast-in-place pile positioned between the front end pile and the rear end pile are connected with the middle crown beam. The cost is effectively controlled while the lateral bending resistance is improved.
Description
Technical Field
The invention relates to the technical field of foundation pit bracing, in particular to a foundation pit bracing mechanism.
Background
In the civil engineering construction process, in order to ensure the safety of underground structure construction and the surrounding environment of the foundation pit, a foundation pit supporting structure is adopted to support and reinforce the side wall of the foundation pit and the surrounding environment, so that the lateral bending resistance of the side wall of the foundation pit and the surrounding environment is improved. For the conditions that the deformation requirement is strict or the geology is soft, a foundation pit supporting structure with strong supporting capability needs to be adopted. In this case, the diameter and length of the cast-in-place piles in the foundation pit supporting structure are generally increased, or the space between the piles is reduced. In addition, a double-row arrangement mode can be adopted, and the lateral bending resistance of the foundation pit supporting structure is improved. However, the above methods have the problem of high cost.
Disclosure of Invention
The invention provides a foundation pit supporting mechanism aiming at the problem of high manufacturing cost when the lateral deformation resistance of a foundation pit support is improved, so that the cost is effectively controlled, and the lateral bending resistance is improved.
A foundation pit supporting mechanism comprises a supporting frame,
the cast-in-place pile comprises a plurality of cast-in-place piles, a plurality of foundation pits and a plurality of foundation piles, wherein the plurality of cast-in-place piles are provided with virtual curved paths along the edge of each foundation pit, each curved path comprises a plurality of unit convex curves protruding towards the direction close to the center of the foundation pit, the plurality of unit convex curves are sequentially connected end to end, and the plurality of cast-in-place piles are sequentially arranged at intervals along the curved paths;
the front-end crown beam is positioned in the plurality of cast-in-place piles on the same unit convex curve, the cast-in-place pile closest to the center of the foundation pit is a front-end pile, and the front-end crown beam is connected with the plurality of front-end piles;
the rear-end crown beam is positioned in the plurality of cast-in-place piles on the same unit convex curve, the cast-in-place pile farthest away from the center of the foundation pit is a rear-end pile, and the rear-end crown beam is connected with the plurality of rear-end piles;
the front end pile and the rear end pile which are adjacent along the curved path, and each cast-in-place pile positioned between the front end pile and the rear end pile are connected with the middle crown beam.
According to the scheme, the plurality of cast-in-place piles are sequentially arranged at intervals along the curve path, and the front-end crown beam, the rear-end crown beam and the middle crown beam are further utilized to connect the cast-in-place piles together, so that a soil body located on the inner side of the unit convex curve and the cast-in-place piles on the unit convex curve can form a stressed whole, and the bending resistance of the foundation pit supporting mechanism is improved integrally. And in the process, the cast-in-place piles are still arranged in a single row, so that the cost is effectively controlled. In sum, the cost is effectively controlled while the lateral bending resistance is improved.
In one embodiment, a mixing pile is arranged between adjacent filling piles along the curved path, and the mixing pile and the adjacent filling pile are partially nested with each other.
In one embodiment, the pile diameter of the cast-in-place pile is consistent with that of the mixing pile;
and/or the axial length of the filling pile is not less than that of the mixing pile;
and/or the nesting depth of the cast-in-place pile and the mixing pile in the radial direction is not less than 150mm, and the nesting depth is not less than 1/6 of the pile diameter of the cast-in-place pile.
In one embodiment, a mixing pile is arranged between adjacent rear end piles along the length direction of the rear end crown beam, a plurality of mixing piles are nested with one another, and the rear end piles and the adjacent mixing piles are also nested with one another.
In one embodiment, a plurality of stirring piles are arranged in the direction parallel to the length direction of the rear-end crown beam, the stirring piles are nested with one another to form a waterproof curtain, the length of the waterproof curtain in the length direction of the rear-end crown beam is not less than that of the rear-end crown beam, the waterproof curtain is arranged at a distance from the rear-end crown beam, and the waterproof curtain is positioned on one side, away from the center of the foundation pit, of the rear-end crown beam.
In one embodiment, the distance between the waterproof curtain and the rear-end crown beam is not larger than the pile diameter of the mixing pile;
or the mixing pile is tangent to the rear-end crown beam;
or the nesting depth between the mixing piles in the radial direction is not less than 150mm, and the nesting depth is not less than 1/6 of the pile diameter of the mixing piles.
In one embodiment, the cast-in-place pile located between the adjacent rear end pile and the front end pile along the curved path is a side pile, and the pile diameter of the side pile is smaller than that of the front end pile and/or that of the rear end pile.
In one embodiment, the shape enclosed by the unit convex curve and the rear-end crown beam is a triangle;
or the unit convex curve is a symmetrical curve taking the self middle point as a symmetrical point;
or the normal direction of the position of the front-end pile on the curved path is a first direction, the distance between the adjacent front-end pile and the rear-end pile in the first direction is H, the pile diameter of the front-end pile is R, H is 2 xR-4 xR, and H is not more than 4m.
In one embodiment, two rear end piles adjacent to one front end pile along the curved path are respectively a left rear end pile and a right rear end pile, a connecting line between the front end pile and the left rear end pile is a side line, a connecting line between the left rear end pile and the right rear end pile is a reference line, and an included angle between the side line and the reference line is smaller than 90 °.
In one embodiment, the included angle between the side edge line and the reference line is 30-60 degrees.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a plan view of pile foundation arrangement in the foundation pit supporting mechanism according to the embodiment;
fig. 2 is a plan view of the arrangement of pile foundations and individual crown beams in the foundation pit supporting mechanism of fig. 1;
fig. 3 is a plan view of the arrangement of pile foundations in the foundation pit supporting mechanism according to another embodiment;
figure 4 is a plan view of the arrangement of the pile foundations and the various crown beams in the foundation pit support mechanism of the embodiment of figure 3;
fig. 5 is a plan view of the arrangement of pile foundations in the excavation supporting mechanism according to still another embodiment;
figure 6 is a plan view of the arrangement of the piles and the various crown beams in the excavation supporting mechanism of the embodiment shown in figure 5.
Description of reference numerals:
10. a foundation pit supporting mechanism; 11. filling piles; 111. a front end pile; 112. a rear end pile; 113. side piles; 12. a front end crown beam; 13. a rear end crown beam; 14. a middle crown beam; 15. stirring the piles; 151. a waterproof curtain; 20. a curved path; 21. the unit convex curve.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
As shown in fig. 1-6, in one embodiment, an excavation supporting mechanism 10 is provided, including,
the cast-in-place pile structure comprises a plurality of cast-in-place piles 11, wherein a virtual curve path 20 is arranged along the edge of a foundation pit, the curve path 20 comprises a plurality of unit convex curves 21 protruding towards the direction close to the center of the foundation pit, the unit convex curves 21 are sequentially connected end to end, and the cast-in-place piles 11 are sequentially arranged at intervals along the curve path 20;
a front-end crown beam 12, which is located in the multiple cast-in-place piles 11 on the same unit convex curve 21, wherein the cast-in-place pile 11 closest to the center of the foundation pit is a front-end pile 111, and the front-end crown beam 12 is connected with the multiple front-end piles 111;
a rear-end crown beam 13, located in the plurality of cast-in-place piles 11 on the same unit convex curve 21, where the cast-in-place pile 11 farthest from the center of the foundation pit is a rear-end pile 112, and the rear-end crown beam 13 is connected to the plurality of rear-end piles 112;
the intermediate crown beam 14, the front end piles 111 and the rear end piles 112 adjacent along the curved path 20, and each cast-in-place pile 11 located between the front end piles 111 and the rear end piles 112 are connected to the intermediate crown beam 14.
According to the foundation pit supporting mechanism 10 provided by the scheme, the plurality of cast-in-place piles 11 are sequentially arranged at intervals along the curved path 20, and the front-end crown beam 12, the rear-end crown beam 13 and the middle crown beam 14 are further utilized to connect the cast-in-place piles 11 together, so that a soil body located on the inner side of the unit convex curve 21 and the cast-in-place piles 11 on the unit convex curve 21 can form a stressed whole, and the bending resistance of the foundation pit supporting mechanism 10 is improved integrally. And in the process, the cast-in-place piles 11 are still arranged in a single row, so that the cost is effectively controlled. In sum, the cost is effectively controlled while the lateral bending resistance is improved.
Specifically, as shown in fig. 1 to 6, in one embodiment, the unit convex curve 21 and the rear end crown beam 13 enclose a triangular shape. The unit convex curves 21 are sequentially connected end to form a broken line having a plurality of bending points as shown in fig. 1 to 6.
Alternatively, in other embodiments, the curvilinear path 20 may be a wave-like curve.
Further, in one embodiment, the unit convex curve 21 is a symmetrical curve with its own midpoint as a symmetrical point. In other words, the unit convex curve 21 is an axisymmetric curve having a normal line passing through a midpoint thereof as a symmetry axis. The stress formed by the cast-in-place pile 11 and the soil body is symmetrical, so that the overall stability is higher.
Further, in one embodiment, two rear end piles 112 adjacent to one front end pile 111 along the curved path 20 are respectively a left rear end pile and a right rear end pile, a connecting line between the front end pile 111 and the left rear end pile is a side line, a connecting line between the left rear end pile and the right rear end pile 112 is a reference line, and an included angle a between the side line and the reference line is smaller than 90 °.
When the foundation pit supporting mechanism 10 receives lateral extrusion force to the inner side, based on the fact that the included angle a between the side edge line and the reference line is smaller than 90 degrees, when the cast-in-place pile 11 arranged on the unit convex curve 21 receives the lateral force, the lateral force can be decomposed to a certain degree and is decomposed into a first component force along the tangential direction of the unit convex curve 21 and a second component force along the normal direction of the unit convex curve 21, the component force which the cast-in-place pile 11 needs to bear and has main destructive force is used as the second component force, and the second component force is smaller than the lateral force. Moreover, when the included angle a between the side line and the reference line is smaller than 90 °, under the connecting action of the front-end crown beam 12, the rear-end crown beam 13 and the middle crown beam 14, the overall stressed shape stability of the cast-in-place pile 11 and the soil body is stronger, and the cast-in-place pile is not easy to deform and collapse, so that the lateral bending resistance of the foundation pit supporting mechanism 10 is enhanced as a whole.
Further preferably, in some embodiments, the included angle between the side line and the reference line is 30 ° to 60 °. In this range, the deeper the foundation pit depth is, the softer the soil quality is, the larger the included angle between the side line and the reference line can be set, so that the virtual wall formed by each cast-in-place pile 11 can envelop more soil mass.
Specifically, as shown in fig. 1 to 6, the unit convex curve 21 and the rear crown 13 are triangular, and the triangle is an equilateral triangle.
Further, as shown in fig. 1 and 2, in one embodiment, mixing piles 15 are disposed between adjacent ones of the cast-in-place piles 11 along the curved path 20, and the mixing piles 15 are partially nested with the adjacent ones of the cast-in-place piles 11. The stirring piles 15 and the filling piles 11 form a waterproof curtain 151 together, so that a good water retaining effect can be achieved, and the blocking and sealing effects on the soil body are stronger. The intermediate crown beam 14 is connected to each of said mixing piles 15 simultaneously with each of the cast-in-place piles 11.
Further, during the construction process, the position of each mixing pile 15 and the position of the filling pile 11 may be determined on the field according to the arrangement of the mixing piles 15 and the filling piles 11, and then the mixing piles 15 are driven. After the mixing pile 15 is constructed, the filling pile 11 is arranged before the concrete is solidified, so that the filling pile 11 and the mixing pile 15 are nested together. The cast-in-place pile 11 is preferably set up one week after the construction of the mixing pile 15. After the cast-in-place pile 11 is constructed, the front-end crown beam 12, the rear-end crown beam 13 and the middle crown beam 14 are arranged.
Specifically, the front-end crown beam 12, the rear-end crown beam 13, and the intermediate crown beam 14 may be arranged 28 days after the cast-in-place pile 11 is constructed.
When the front-end crown beam 12, the rear-end crown beam 13 and the intermediate crown beam 14 are arranged, pile head breaking treatment is firstly carried out on each cast-in-place pile 11, and then the front-end crown beam 12, the rear-end crown beam 13 and the intermediate crown beam 14 are respectively connected with main reinforcements of the corresponding cast-in-place piles 11.
Further, the front end crown beam 12, the rear end crown beam 13, and the intermediate crown beam 14 are uniform in width.
Further, in one embodiment, as shown in fig. 1 and 2, the pile diameter of the cast-in-place pile 11 is the same as the pile diameter of the mixing pile 15. So that the thickness of the water curtain 151 formed by the filling pile 11 and the mixing pile 15 is consistent.
Preferably, the widths of the front end crown beam 12, the rear end crown beam 13 and the middle crown beam 14 are the same as the pile diameter of the cast-in-place pile 11.
Further, in one embodiment, the axial length of cast-in-place pile 11 is not less than the axial length of mixing pile 15. So that the cast-in-place pile 11 and the mixing pile 15 can form a complete waterproof curtain 151 without water production being performed sufficiently due to the inconsistent axial lengths of the cast-in-place pile 11 and the mixing pile 15.
Further specifically, in one embodiment, the nesting depth of cast-in-place pile 11 and mixing pile 15 in the radial direction is not less than 150mm, and the nesting depth is not less than 1/6 of the pile diameter of cast-in-place pile 11. So that the connection between the filling pile 11 and the stirring pile 15 is tighter, and the water stopping effect and the soil retaining effect are better.
Further, as shown in fig. 3 and 4, in another embodiment, a mixing pile 15 is disposed between adjacent mixing piles 112 along the length direction of the rear crown beam 13, and a plurality of mixing piles 15 are nested with each other, the mixing piles 112 are also nested with the adjacent mixing piles 15, and the mixing piles 15 and the rear piles 112 form a waterproof curtain 151.
In constructing such an excavation supporting mechanism 10, compared to the construction process of arranging the mixing piles 15 along the curved path 20 to form the excavation supporting mechanism 10 (shown in fig. 1 and 2) with the filling piles 11 as the waterproof curtain 151, the filling piles 11 are not required to be arranged after the mixing piles 15 are arranged, except that the rear-end piles 112 are required to be nested with the mixing piles 15. In other words, the cast-in-place piles 11 other than the rear-end pile 112 may be constructed simultaneously when each mixing pile 15 is driven.
Further, as shown in fig. 3 and 4, the nesting depth of the rear end pile 112 and the mixing pile 15 in the radial direction is not less than 150mm, and the nesting depth is not less than 1/6 of the pile diameter of the rear end pile 112.
Specifically, in one embodiment, the diameter of the rear end pile 112 is the same as the diameter of the mixing pile 15. The axial length of the rear end pile 112 is not less than the axial length of the mixing pile 15.
Further, in yet another embodiment, as shown in fig. 5 and 6, a plurality of stirring piles 15 are arranged in a direction parallel to the length direction of the rear end crown beam 13, and a plurality of stirring piles 15 are nested with each other to form a waterproof curtain 151, the length of the waterproof curtain 151 in the length direction of the rear end crown beam 13 is not less than the length of the rear end crown beam 13, and the waterproof curtain 151 is arranged at a distance from the rear end crown beam 13, and the waterproof curtain 151 is located on a side of the rear end crown beam 13 away from the center of the foundation pit.
In the construction of such a foundation pit supporting structure 10, after the positions of the mixing pile 15 and the cast-in-place pile 11 are determined in advance on the site, the mixing pile 15 and the cast-in-place pile 11 can be arranged simultaneously.
Specifically, in one embodiment, as shown in fig. 5 and 6, the distance between the waterproof curtain 151 and the rear-end crown beam 13 is not greater than the pile diameter of the mixing pile 15; alternatively, the mixing piles 15 are tangent to the rear end crown beam 13. The waterproof curtain 151 can protect the cast-in-place pile 11 well, and the waterproof curtain 151 can enable the soil body to be located in the range enveloped by the one-way convex curve more reliably to a certain extent.
Further, similarly, the nesting depth between the mixing piles 15 in the radial direction is not less than 150mm, and the nesting depth is not less than 1/6 of the pile diameter of the mixing piles 15.
Preferably, the diameter of the mixing pile 15 may be set to 800mm to 1600mm.
Further, in one embodiment, as shown in fig. 3 to 6, when the stirring piles 15 form a waterproof curtain 151 together with the rear-end piles 112, or the stirring piles 15 themselves are nested with each other to form the waterproof curtain 151. The cast-in-place pile 11 located between the adjacent rear end pile 112 and the front end pile 111 along the curved path 20 is a side pile 113, and the pile diameter of the side pile 113 may be smaller than the pile diameter of the front end pile 111 and/or the pile diameter of the rear end pile 112. Thereby achieving the purpose of saving cost.
Specifically, the side piles 113 are arranged at intervals, and the distance between adjacent side piles 113 is not greater than the pile diameter of the side piles 113;
or, each of the side piles 113 is tangent to each other.
Further, in an embodiment, a normal direction of a position of the front end pile 111 on the curved path 20 is a first direction, a distance between adjacent front end piles 111 and the rear end pile 112 in the first direction is H, a pile diameter of the front end pile 111 is R, H is 2 × R to 4 × R, and H is not greater than 4m. The distance H is a distance between the axis of the front end pile 111 and the axis of the rear end pile 112 in the first direction, and it is understood that when the unit convex curve 21 and the figure surrounded by the rear end crown beam 13 are triangular, the distance H is a height of the triangle.
So that the inner side of the unit convex curve 21 has enough space to accommodate soil, and a stressed whole body can be formed between the cast-in-place pile 11 and the soil. And meanwhile, the cost can be saved.
Further specifically, in one embodiment, as shown in fig. 2, 4 and 6, the front crown beam is parallel to the rear crown beam.
In the embodiment shown in fig. 1 and 2 of the present application, the waterproof curtain 151 is formed by nesting the mixing piles 15 and all the cast-in-place piles 11, and the waterproof curtain 151 is a wall body which is curved along the curved path 20;
in the embodiment shown in fig. 3 and 4, the waterproof curtain 151 is formed by sequentially nesting the mixing piles 15 and the rear piles 112 along the length direction of the rear crown beam 13, and the waterproof curtain 151 is a longitudinal wall parallel to the rear crown beam 13;
the main difference between the embodiments of fig. 5 and 6 and the embodiments of fig. 3 and 4 in this application is that the waterproof curtain 151 is completely composed of the respective mixing piles 15, and the waterproof curtain 151 is spaced apart from or tangent to the rear-end piles 112.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, 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 at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A foundation pit supporting mechanism is characterized by comprising,
the cast-in-place pile comprises a plurality of cast-in-place piles, a plurality of foundation pits and a plurality of foundation piles, wherein the plurality of cast-in-place piles are provided with virtual curved paths along the edge of each foundation pit, each curved path comprises a plurality of unit convex curves protruding towards the direction close to the center of the foundation pit, the plurality of unit convex curves are sequentially connected end to end, and the plurality of cast-in-place piles are sequentially arranged at intervals along the curved paths;
the front-end crown beam is positioned in the plurality of cast-in-place piles on the same unit convex curve, the cast-in-place pile closest to the center of the foundation pit is a front-end pile, and the front-end crown beam is connected with the plurality of front-end piles;
the rear-end crown beam is positioned in the plurality of cast-in-place piles on the same unit convex curve, the cast-in-place pile farthest away from the center of the foundation pit is a rear-end pile, and the rear-end crown beam is connected with the plurality of rear-end piles;
the front end pile and the rear end pile which are adjacent along the curved path, and each cast-in-place pile positioned between the front end pile and the rear end pile are connected with the middle crown beam;
a stirring pile is arranged between the adjacent cast-in-place piles along the curved path, the stirring pile and the adjacent cast-in-place piles are partially nested with each other, and the pile diameter of the cast-in-place pile is consistent with that of the stirring pile;
a mixing pile is arranged between the adjacent rear end piles along the length direction of the rear end crown beam, a plurality of mixing piles are mutually nested, the rear end piles and the adjacent mixing piles are also mutually nested, a filling pile positioned between the adjacent rear end piles and the front end piles along the curved path is a side pile, and the pile diameter of the side pile is smaller than that of the front end pile and/or that of the rear end pile;
the waterproof curtain is characterized in that a plurality of stirring piles are arranged in the direction parallel to the length direction of the rear-end crown beam, the stirring piles are mutually nested to form a waterproof curtain, the length of the waterproof curtain is not smaller than that of the rear-end crown beam in the length direction of the rear-end crown beam, the waterproof curtain and the rear-end crown beam are arranged at intervals, and the waterproof curtain is located on one side, far away from the center of the foundation pit, of the rear-end crown beam.
2. The excavation supporting mechanism according to claim 1, wherein an axial length of the cast-in-place pile is not smaller than an axial length of the mixing pile.
3. The foundation pit supporting mechanism according to claim 1, wherein the nesting depth of the mixing pile and the cast-in-place pile arranged between the adjacent cast-in-place piles along the curved path is not less than 150mm in the radial direction, and the nesting depth is not less than 1/6 of the pile diameter of the cast-in-place pile.
4. The excavation supporting mechanism of claim 1, wherein a distance between the waterproof curtain and the rear-end crown beam is not greater than a pile diameter of the mixing pile.
5. The excavation supporting mechanism of claim 1, wherein the mixing piles nested within each other to form the waterproof curtain are tangent to the rear end crown beam.
6. The foundation pit support mechanism according to claim 1, wherein the nesting depth in the radial direction between the stirring piles nested with each other to form the waterproof curtain is not less than 150mm, and the nesting depth is not less than 1/6 of the pile diameter of the stirring piles.
7. The foundation pit supporting mechanism according to any one of claims 1 to 6, wherein the unit convex curve and the rear-end crown beam enclose a triangle.
8. A foundation pit support mechanism according to any one of claims 1 to 6, wherein the unit convex curve is a symmetrical curve with its midpoint as a point of symmetry.
9. The foundation pit supporting mechanism according to any one of claims 1 to 6, wherein a normal direction of a position of the front end pile on the curved path is a first direction, a distance between the adjacent front end pile and the rear end pile in the first direction is H, a pile diameter of the front end pile is R, H is 2 xR-4 xR, and H is not more than 4m.
10. A foundation pit supporting mechanism according to any one of claims 1 to 6, wherein the two rear piles adjacent to one of the front piles along the curved path are respectively a left rear pile and a right rear pile, the line connecting the front pile and the left rear pile is a side line, the line connecting the left rear pile and the right rear pile is a reference line, and the angle between the side line and the reference line is less than 90 °.
11. The foundation pit supporting mechanism of claim 10, wherein the included angle between the side line and the datum line is 30-60 °.
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| CN202110796086.3A CN113605398B (en) | 2021-07-14 | 2021-07-14 | Foundation pit supporting mechanism |
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|---|---|---|---|---|
| CN203684229U (en) * | 2013-11-21 | 2014-07-02 | 昆明理工大学 | Connected double-row pile support structure |
| CN203583498U (en) * | 2013-12-07 | 2014-05-07 | 兰州市政建设集团有限责任公司 | Micropile combination wall supporting structure |
| CN103758134B (en) * | 2014-01-24 | 2015-09-30 | 中国建筑股份有限公司 | A kind of construction method combining Double-row Piles Support system |
| CN105040706B (en) * | 2015-05-19 | 2017-11-10 | 昆明理工大学 | A kind of Retaining Structure with Double-row Piles and its construction method that can make full use of basement space |
| CN208251111U (en) * | 2018-03-18 | 2018-12-18 | 中铁十九局集团第三工程有限公司 | The Double-row Piles Support system of the local soft soil property of foundation pit can be overcome |
| CN208379610U (en) * | 2018-06-14 | 2019-01-15 | 中冶集团武汉勘察研究院有限公司 | A kind of broken line alternating expression double-row pile foundation pit support structure |
| JP2020076285A (en) * | 2018-11-02 | 2020-05-21 | 日本製鉄株式会社 | Quay wall structure and construction method for quay wall structure |
| CN109914394A (en) * | 2019-03-30 | 2019-06-21 | 西安科技大学 | A kind of zigzag Row Piles Supporting Structure |
| CN110820763A (en) * | 2019-11-29 | 2020-02-21 | 兰州理工大学 | Truss type cast-in-situ bored pile supporting method for mucky soil deep foundation pit |
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2021
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