Miniature pile foundation of expanding bearing platform

Abstract

The utility model relates to a diameter-expanded bearing platform miniature pile foundation which comprises a stand column, a concrete bearing platform and miniature piles, iron tower foundation bolts are pre-buried in the center of the stand column and the center of the concrete bearing platform, a groove is formed in the bottom of the concrete bearing platform, and the tops of the miniature piles are embedded in the groove of the concrete bearing platform and connected through steel hoops. Second-stage expanding bodies are arranged on the micro pile in the longitudinal direction of a pile body at intervals, each second-stage expanding body comprises expanding heads arranged at the one-third position and the two-third position of the pile body of the micro pile, and the micro pile has higher bearing capacity and smaller settlement.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of expanded-diameter pile cap micro pile foundation, belong to pile foundation technical field. BACKGROUND

[0002] Conventional cast-in-place pile or micro pile is suitable for various geological conditions, including clay, silt, sandy soil, gravel layer and strongly weathered bedrock, etc., which resists the upper load through the side friction of pile body and soil layer and the end resistance of pile tip. The expanded-diameter pile cap micro pile foundation is a type of foundation composed of upper pile cap, micro pile, enlarged head and other components. The expanded-diameter pile is a kind of variable cross-section pile, which can fully exert the bearing potential of soil layer and pile body, greatly improve the bearing capacity, and at the same time reduce the settlement. Therefore, compared with conventional micro pile, the expanded-diameter pile cap micro pile foundation has higher bearing capacity and smaller settlement. SUMMARY

[0003] To solve the above problems existing in the prior art, the utility model provides an expanded-diameter pile cap micro pile foundation, which can have higher bearing capacity and smaller settlement.

[0004] The technical scheme of the utility model is as follows:

[0005] An expanded-diameter pile cap micro pile foundation, comprising a stand, a concrete pile cap and a micro pile, the stand and the concrete pile cap are pre-buried with iron tower anchor bolts at the center, the bottom of the concrete pile cap is provided with a groove, the top of the micro pile is embedded in the groove of the concrete pile cap and connected by a steel hoop, the micro pile is provided with two-stage expanded-diameter bodies longitudinally spaced along the pile body, and the two-stage expanded-diameter bodies comprise enlarged heads arranged at one-third and two-thirds of the pile body of the micro pile.

[0006] Among them, four micro piles are arranged, the distance between the centers of adjacent micro piles is 2000mm, the top of the pile head of the micro pile enters the groove of the concrete pile cap by 100mm, the diameter of the micro pile is 400mm, and the length L of the micro pile ranges from 8000mm to 10000mm.

[0007] Among them, the enlarged head is provided with 1200mm along the length direction of the micro pile, the center of the enlarged head is outwardly convex and the cross section at the center is circular, and the diameter d of the circular cross section of the enlarged head is 800mm.

[0008] Among them, the inner wall of the groove of the concrete pile cap is provided with a stepped engagement structure, the stepped engagement structure is formed by continuous fold lines extending from alternating horizontal pressure surfaces and vertical shear surfaces; the outer surface of the steel hoop is welded with a wave-shaped anti-skid rib, the wave crest of the anti-skid rib is embedded with the horizontal pressure surface of the stepped indentation, and the wave trough is in abutment with the vertical shear surface.

[0009] The vertical shear surface of the stepped occlusion structure is arranged obliquely, and the inclined surface of the anti-skid rib is consistent with the oblique direction of the vertical shear surface.

[0010] The utility model has the following beneficial effects:

[0011] The utility model discloses a two-stage expansion body structure is arranged at the key position of the pile body of the micropile, and the two-stage expansion body structure forms a cooperative bearing effect, which significantly improves the side friction resistance and end resistance of the pile foundation. The connection mode of the concrete bearing platform groove and the steel hoop at the top of the pile is combined with the mutual embedding effect of the stepped occlusion structure and the anti-skid rib, so that the shear strength and the torsional resistance of the connection joint are effectively enhanced. Finally, the bearing capacity of the pile foundation is greatly improved, the settlement is effectively controlled, and the overall structural stability is comprehensively optimized. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 It is a structural schematic diagram of the utility model;

[0013] Fig. 2 It is a half sectional view of the utility model;

[0014] Fig. 3 It is a stepped occlusion structure and anti-skid rib schematic diagram of the utility model;

[0015] Fig. 4 It is a top view of the utility model.

[0016] The reference signs in the drawing represent:

[0017] 1, stand; 2, micropile; 3, concrete bearing platform; 4, expansion head; 5, stepped occlusion structure; 6, anti-skid rib. DETAILED DESCRIPTION

[0018] The utility model will be described in detail in combination with the drawings and specific embodiments.

[0019] Please refer to Figs. 1 to 4 The utility model provides a technical scheme:

[0020] The utility model discloses a two-stage expansion head micropile foundation, which comprises a stand, a concrete bearing platform and a micropile. The stand and the concrete bearing platform are provided with a center embedded iron tower anchor bolt. The bottom of the concrete bearing platform is provided with a groove. The top of the micropile is embedded into the groove of the concrete bearing platform and connected by a steel hoop. The micropile is provided with two-stage expansion bodies along the longitudinal direction of the pile body. The two-stage expansion bodies comprise expansion heads arranged at one-third and two-thirds of the pile body of the micropile. The two-stage expansion heads can improve the side friction resistance and the end resistance by the cooperative effect of the upper and lower expansion heads, meet the demand of extreme load, and form two stress diffusion zones, so that the stress distribution of the soil around the pile is more uniform.

[0021] The micro pile 2 is provided with four, the center distance between adjacent micro piles 2 is 2000mm, the pile head top of the micro pile 2 enters the groove in the concrete cap 3 by 100mm, the diameter of the micro pile 2 is 400mm, and the length L of the micro pile 2 is in the range of 8000mm≤L≤10000mm, the enlarged head 4 is provided with 1200mm along the length direction of the micro pile 2, the center of the enlarged head 4 is outwardly convex and the center section is circular, the circular section avoids sharp angle stress concentration, and the diameter d of the circular section of the enlarged head 4 is 800mm;

[0022] The inner wall of the concrete cap 3 groove is provided with a stepped engagement structure 5, which is formed by continuous fold lines of alternating horizontal pressure bearing surfaces and vertical shear surfaces; the outer surface of the steel sleeve is welded with a wave-shaped anti-skid rib 6, the wave crest of the anti-skid rib 6 is embedded with the horizontal pressure bearing surface of the stepped notch, and the wave trough is in abutment with the vertical shear surface; the vertical shear surface of the stepped engagement structure 5 is inclinedly arranged, the inclined direction of the inclined surface of the anti-skid rib 6 is consistent with the inclination direction of the vertical shear surface; the anti-skid rib 6 is in the same direction as the notch of the stepped engagement structure 5;

[0023] Specifically, the steel sleeve is vertically placed in the groove and rotated counterclockwise by a certain angle, at this time, the wave crest of the anti-skid rib 6 slides into the horizontal pressure bearing surface below the stepped engagement structure 5 of the groove, the horizontal surface supports the wave crest to prevent the sleeve from coming out upward, forming a pressure bearing contact; the wave trough of the anti-skid rib 6 is in close contact with the outer side of the vertical shear surface of the stepped engagement structure 5, the vertical surface is in abutment with the wave trough to prevent the steel sleeve from moving horizontally; through the stepped structure and the wave-shaped dislocation engagement, the rotation of the steel sleeve is limited.

[0024] The sleeve is vertically placed in the groove, the wave crest of the anti-skid rib 6 is aligned with the lowest point of the stepped engagement structure 5; then the rotation operation is performed, which is similar to screwing a screw counterclockwise, at this time, the wave crest of the anti-skid rib 6 slides along the stepped engagement structure 5 and climbs, that is, the operation is completed.

[0025] The above is only an embodiment of the present application, and does not limit the patent range of the present application, any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A micro-pile foundation with enlarged-diameter pile cap, comprising a column (1), a concrete pile cap (3) and micro-piles (2), characterized in that: The column (1) and the concrete platform (3) are embedded with a tower anchor bolt, the bottom of the concrete platform (3) is provided with a groove, the top of the micro pile (2) is embedded in the groove of the concrete platform (3) and connected by a steel hoop, the micro pile (2) is provided with a two-stage diameter expansion body along the longitudinal direction of the pile body, and the two-stage diameter expansion body includes an enlarged head (4) arranged at one-third and two-thirds of the pile body of the micro pile (2).

2. The micro-pile foundation of claim 1, wherein: The micro pile (2) is provided with four micro piles, the distance between the centers of adjacent micro piles (2) is 2000mm, the top of the pile head of the micro pile (2) enters the groove of the concrete platform (3) by 100mm, the diameter of the micro pile (2) is 400mm, and the length L of the micro pile (2) is in the range of 8000mm≤L≤10000mm.

3. The micro-pile foundation of claim 2, wherein: The enlarged head (4) is provided along the length direction of the micro pile (2) by 1200mm, the center of the enlarged head (4) is outwardly convex and the cross section of the center is circular, and the diameter d of the circular cross section of the enlarged head (4) is 800mm.

4. The micro-pile foundation of claim 1, wherein: The inner wall of the groove of the concrete platform (3) is provided with a stepped engagement structure (5), the stepped engagement structure (5) is formed by continuously extending the alternate horizontal pressure bearing surface and vertical shear surface; the outer surface of the steel hoop is welded with a wave-shaped anti-skid rib (6), the wave crest of the anti-skid rib (6) is embedded with the horizontal pressure bearing surface of the stepped notch, and the wave trough is in abutment with the vertical shear surface.

5. The micro-pile foundation of claim 4, wherein: The vertical shear surface of the stepped engagement structure (5) is inclined, and the inclined surface of the anti-skid rib (6) is consistent with the inclined direction of the vertical shear surface.

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