CN217419662U - Foundation pit enclosure structure adopting non-circular cast-in-place pile - Google Patents
Foundation pit enclosure structure adopting non-circular cast-in-place pile Download PDFInfo
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- CN217419662U CN217419662U CN202221243176.6U CN202221243176U CN217419662U CN 217419662 U CN217419662 U CN 217419662U CN 202221243176 U CN202221243176 U CN 202221243176U CN 217419662 U CN217419662 U CN 217419662U
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Abstract
The utility model belongs to the technical field of underground foundation ditch engineering, side slope support technique and specifically relates to an adopt foundation ditch retaining structure of non-circular bored concrete pile, foundation ditch retaining structure is including setting up a plurality of non-circular bored concrete piles in the foundation ditch waist rail outside, non-circular bored concrete pile is greater than the size of its parallel foundation ditch direction along the size of perpendicular foundation ditch direction, and is a plurality of non-circular bored concrete pile follows the even interval arrangement of parallel foundation ditch direction. The utility model has the advantages that: the section of the pile foundation is non-circular, and has stronger section characteristic in a certain specified direction, and the specification of the reinforcing bars is adjusted according to the stress magnitude and the direction when the reinforcing bar is used, so that raw materials can be greatly saved on the premise of meeting engineering requirements, and the economic benefit is remarkable; the method is particularly suitable for bearing projects mainly based on horizontal load, such as foundation pit projects and slope projects.
Description
Technical Field
The utility model belongs to the technical field of underground foundation ditch engineering, side slope support technique and specifically relates to an adopt foundation ditch retaining structure of non-circular bored concrete pile.
Background
With the acceleration of urbanization process, geotechnical engineering technology is continuously developed. However, the cast-in-place pile used for traditional foundation pit support is circular, and firstly, the section is too concentrated on the centroid and cannot exert larger resisting moment; secondly, the section characteristics in all directions are not different, and no pertinence is provided for the load transmitted from a specific direction; furthermore, countless symmetrical axes are provided, so that full-ring uniform reinforcement is usually adopted during reinforcement distribution to prevent construction from causing disorder; finally, when the circular cast-in-place pile mainly bears horizontal force, the circular cast-in-place pile cannot be used for the characteristic of horizontal load, so that concrete and steel bars are wasted, and the amount of soil taking and slag conveying engineering in the hole is increased in the pile forming process.
Disclosure of Invention
The utility model aims to provide a foundation pit enclosure structure adopting a non-circular filling pile according to the defects of the prior art, which realizes the larger section characteristic of the foundation pit enclosure structure in a specific direction by changing the shape of a pile foundation, and adopts smaller section layout in other directions, thereby saving materials; meanwhile, the distance from the reinforcing steel bar to the pressed area is larger, and the using amount of the reinforcing steel bar can be saved.
The utility model discloses the purpose is realized accomplishing by following technical scheme:
the utility model provides an adopt foundation ditch envelope of non-circular bored concrete pile which characterized in that: the foundation pit support structure comprises a plurality of non-circular cast-in-place piles arranged on the outer side of a foundation pit waist beam, the size of each non-circular cast-in-place pile in the direction perpendicular to the foundation pit is larger than that of the non-circular cast-in-place pile in the direction parallel to the foundation pit, and the non-circular cast-in-place piles are arranged in the direction parallel to the foundation pit at even intervals.
The non-circular bored concrete pile is inside to be equipped with tip atress main reinforcement, auxiliary frame founding muscle, stirrup and reinforcement stirrup, wherein tip atress main reinforcement set up in non-circular bored concrete pile is along the both sides tip of perpendicular foundation ditch direction, the auxiliary frame founding muscle sets up in both sides between the tip atress main reinforcement, tip atress main reinforcement with the auxiliary frame founding muscle passes through the outer lane stirrup and inner circle the reinforcement stirrup is connected and is constituted wholly.
And a water stopping structure is arranged between the adjacent non-circular cast-in-place piles or on the outer side of the non-circular cast-in-place piles.
The water stopping structure can be one of a rotary jet water stopping structure among piles, a stirring water stopping structure around the piles and a plain concrete water stopping structure among the piles.
The plain concrete water-stop structure among the piles is occluded with the non-circular cast-in-place pile.
The utility model has the advantages that:
1) by using the non-circular section and utilizing the larger section characteristic of the non-circular section in the long edge direction to resist the pressure of the foundation pit side wall soil, the same supporting rigidity can be realized by using less concrete, and the cement consumption is greatly saved.
2) Because the distance from the center of the steel bar to the compression area is increased, the reinforcement ratio of the cross section under the same rigidity and bending moment is smaller, and the consumption of the steel bar can be greatly saved.
3) The utility model discloses a pile body cross-section arrangement of reinforcement can adopt the inhomogeneous arrangement of reinforcement of symmetry, tip arrangement of reinforcement is intensive promptly, neutral zone structure arrangement of reinforcement, and the construction that leads to when can avoiding the inhomogeneous arrangement of reinforcement of traditional circular pile easily obscures the problem.
Drawings
FIG. 1 is a schematic view of the pile section and reinforcement of the present invention;
fig. 2 is a schematic diagram of the arrangement of the pile type in the foundation pit engineering of the present invention;
fig. 3 is a schematic diagram of the arrangement of the pile type in the foundation pit engineering of the present invention;
fig. 4 is a schematic diagram of the arrangement of the pile type in the foundation pit engineering of the present invention;
FIG. 5 is a schematic view of the construction principle of the non-circular pile hole-forming machine usable in the construction of the present invention;
fig. 6 is a three-dimensional view of the soil bin structure of fig. 5.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-6, the labels 1-13 are respectively shown as: the foundation pit supporting structure comprises a non-circular cast-in-place pile 1, a water stopping structure 2, a foundation pit waist beam 3, a foundation pit support 4, a drill rod 5 of a drilling machine, a constraint drill rod shaft sleeve 6, a soil storage box 7, a helical blade 8, an end stress main rib 9, an auxiliary frame vertical rib 10, a stirrup 11, a reinforcing stirrup 12 and a shaping blade foot 13.
Example (b): as shown in fig. 1 and fig. 2, the foundation pit support structure using the non-circular cast-in-place piles in the present embodiment includes non-circular cast-in-place piles 1, a foundation pit wale 3, and a foundation pit support 4. The foundation pit wale 3 and the foundation pit support 5 are an enclosure structure of the foundation pit and are arranged at the side edge of the foundation pit, and the foundation pit support 4 is erected between the two foundation pit wales 4 at the opposite sides to increase the strength of the enclosure structure.
As shown in fig. 2, a plurality of non-circular cast-in-place piles 1 are arranged on the outer side of the foundation pit wale 4 along the direction parallel to the foundation pit, and the size of the non-circular cast-in-place piles 1 along the direction vertical to the foundation pit is larger than that parallel to the foundation pit, so that the non-circular cast-in-place piles 1 have larger rigidity in the direction vertical to the foundation pit and are used for bearing loads transmitted in the direction vertical to the foundation pit, and the loads in other directions are reduced, therefore, under the same supporting rigidity, raw materials can be greatly saved.
As shown in fig. 1, an end stressed main reinforcement 9, an auxiliary frame vertical reinforcement 10, a stirrup 11 and a reinforcement stirrup 12 are arranged inside a non-circular cast-in-place pile 1, wherein the end stressed main reinforcement 9 is arranged at the end parts of the two sides of the non-circular cast-in-place pile 1 along the vertical foundation pit direction, the auxiliary frame vertical reinforcement 10 is arranged between the end stressed main reinforcements 9 at the two sides, and the end stressed main reinforcement 9 and the auxiliary frame vertical reinforcement 10 are connected into a whole through the stirrup 11 at the outer ring and the reinforcement stirrup 12 at the inner ring.
In this embodiment, the longitudinal main rib arrangement form of the reinforcement of the non-circular cast-in-place pile 1 can be simplified into a two-axis symmetrical cross section, and compared with the traditional circular form, the stress direction can be clearly identified, so that the structural form of the non-circular cast-in-place pile 1 can be further clearly controlled, and more main ribs are arranged in the load direction to bear main load.
As shown in fig. 2 or 3, when facing a water ground, a water stopping structure 2 may be provided between the non-circular cast-in-place piles 1 or at the outer side of the non-circular cast-in-place piles 1 to prevent water from leaking to the inner side of the foundation pit.
In actual construction, the water stop structure 2 can select an inter-pile swinging spray, an inter-pile rotary spray, an inter-pile circular plain concrete pile and an inter-pile non-circular plain concrete pile with an inter-pile meshing function according to conditions; and a rotary spraying pile or a stirring pile independent outside the pile can be selected. When the water stopping structure 2 with the occlusion function is arranged between the non-circular cast-in-place piles 1, the integrity of each non-circular cast-in-place pile 1 can be effectively improved, and the supporting rigidity which can be improved by the non-circular cast-in-place piles is further improved.
In the present embodiment, the center-to-center distance between adjacent non-circular cast-in-place piles 1 should be generally not greater than the calculated width of the stress
，
D is the diameter of an arc of the pile end far away from the side of the foundation pit, and d is generally not more than 1 m; when d is greater than 1m, the composition,
. When not satisfying the above
In the process, the shearing-resistant bearing capacity of the water stopping structure 2 and the occlusion part of the non-circular cast-in-place pile 1 and the water stopping measure 2 is additionally checked and calculated.
In the embodiment, in specific implementation: the contour of the non-circular cast-in-place pile 1 formed by manual welding can be used as a full pile casing, and the full pile casing can be realized by adopting various drilling machines such as an existing rotary drilling machine, an existing spiral drilling machine and the like under the working condition of full pile casing follow-up.
During construction, the method comprises the following construction steps:
1) construction preparation: after the field is leveled, accurately setting out the positioning pile position;
2) creating a hole in the formation using existing equipment;
3) placing a reinforcement cage configured according to the figure 1 in the range of the pile body to complete the construction of the non-circular cast-in-place pile 1;
4) and repeating the steps to complete the construction of all the pile bodies.
In addition, the non-circular cast-in-place pile 1 in the present embodiment may also be implemented by using the non-circular cast-in-place pile hole forming apparatus shown in fig. 5 and 6.
Specifically, the main construction principle of the non-circular bored concrete pile hole forming equipment is that a double-shaft drilling machine is used for forming holes initially and precisely after shaping; if the drill rod 5 of the drilling machine is restrained by the drill rod shaft sleeve 6 of the drilling machine to fix the relative position of the drill rod 5 of the drilling machine, the lower part of the drill rod 5 of the drilling machine is provided with a helical blade 8 for drilling the formation soil to realize primary hole forming; the outer contour of the soil storage box 7 is designed into the non-circular pile section size, the bottom of the soil storage box is provided with a shaping blade 13, and when the soil storage box 7 descends along with the drilling machine drill rod 5 in a drilling mode, a hole is formed through the shaping blade 13 and is renovated into the section size matched with the non-circular cast-in-place pile 1 in a matching mode.
When the device shown in fig. 5 and 6 is used for construction, the method comprises the following hole forming steps:
1) arranging power and speed-reducing torque-increasing equipment according to a conventional drilling machine;
2) arranging two drilling machine drill rods 8, and arranging a drill bit with a helical blade 8 at the lower part of each drilling machine drill rod 8;
3) a shaping cutting edge 13 is arranged at the lower part of the drilling machine for finishing and realizing the design of a pile shape;
4) the lower part of the drilling machine is provided with a soil storage box 7 for temporarily storing pore-forming soil;
5) during drilling construction, the soil storage box 7 is lifted to the ground for soil discharge after soil is fully stored.
Taking a common 800@1000mm drilling and pouring fender post as an example, the section form of the embodiment is adopted, and the same rigidity of the fender post can be realized by selecting a non-circular fender post 1 with the diameter of 600 x 1000 (the diameter of the end part x the length of the long side) @1757 mm; and the concrete consumption of the two can be saved by 68.88% under the same supporting rigidity, and the steel bar consumption can be greatly saved due to the increase of the force arm in the steel bar of the pile body. Similarly, when a 1000@1200mm bored cast-in-place fender pile is taken as an example, the cross section form of the embodiment is adopted, 800 x 1400 (end diameter x long side length) @3177mm is selected, and the same rigidity of the fender pile is realized, so that the consumption of concrete can be saved by 111%, and the consumption of reinforcing steel bars can be greatly saved in the same manner.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.
Claims (5)
1. The utility model provides an adopt foundation ditch envelope of non-circular bored concrete pile which characterized in that: the foundation pit support structure comprises a plurality of non-circular cast-in-place piles arranged on the outer side of a foundation pit waist beam, the size of each non-circular cast-in-place pile in the direction perpendicular to the foundation pit is larger than that of the non-circular cast-in-place pile in the direction parallel to the foundation pit, and the non-circular cast-in-place piles are arranged in the direction parallel to the foundation pit at even intervals.
2. A foundation pit enclosure structure using non-circular cast-in-place piles according to claim 1, wherein: the non-circular bored concrete pile is inside to be equipped with tip atress main reinforcement, auxiliary frame founding muscle, stirrup and reinforcement stirrup, wherein tip atress main reinforcement set up in non-circular bored concrete pile is along the both sides tip of perpendicular foundation ditch direction, the auxiliary frame founding muscle sets up in both sides between the tip atress main reinforcement, tip atress main reinforcement with the auxiliary frame founding muscle passes through the outer lane stirrup and inner circle the reinforcement stirrup is connected and is constituted wholly.
3. A foundation pit support structure using non-circular cast-in-place piles as claimed in claim 1, wherein: and a water stopping structure is arranged between the adjacent non-circular cast-in-place piles or on the outer side of the non-circular cast-in-place piles.
4. A foundation pit enclosure structure using non-circular cast-in-place piles according to claim 3, wherein: the water stopping structure can be one of a rotary jet water stopping structure among piles, a stirring water stopping structure around the piles and a plain concrete water stopping structure among the piles.
5. A foundation pit enclosure structure adopting non-circular cast-in-place piles according to claim 4, wherein: the plain concrete water-stop structure among the piles is meshed with the non-circular cast-in-place pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221243176.6U CN217419662U (en) | 2022-05-23 | 2022-05-23 | Foundation pit enclosure structure adopting non-circular cast-in-place pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221243176.6U CN217419662U (en) | 2022-05-23 | 2022-05-23 | Foundation pit enclosure structure adopting non-circular cast-in-place pile |
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| CN217419662U true CN217419662U (en) | 2022-09-13 |
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| CN202221243176.6U Active CN217419662U (en) | 2022-05-23 | 2022-05-23 | Foundation pit enclosure structure adopting non-circular cast-in-place pile |
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| CN (1) | CN217419662U (en) |
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- 2022-05-23 CN CN202221243176.6U patent/CN217419662U/en active Active
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