CN210827538U - Compound circular basis with screw pile - Google Patents

Abstract

The utility model discloses a composite circular foundation with spiral piles, which comprises a circular foundation and a plurality of spiral piles arranged on the circular foundation, wherein the structural form combines a circular shallow foundation form and a spiral pile foundation form, the spiral piles are implanted outside the circular foundation, downward injection force is generated by controlling the rotation of the spiral piles, and the downward injection force is transmitted to the circular foundation through a flange and a circular steel plate, so that the circular foundation is driven to sink to a preset position; after the sinking is finished, hydraulic concrete is poured into the joint of the spiral pile and the circular foundation grouting sleeve through the grouting pipe prefabricated in the structure, the circular foundation body is restrained by the spiral pile, so that the structure integrally bears horizontal load, overturning load and uplifting load, and the composite bearing performance of the structure is improved.

Description

Compound circular basis with screw pile

Technical Field

The utility model relates to a foundation structure of ocean engineering especially relates to a compound circular basis with screw pile.

Background

In the 21 st century, the energy crisis is increasingly prominent, the marine oil resources in China are quite rich and account for about one third of the total oil resource amount in China, so the marine oil resources become one of the important sources of the current and future energy in China, and the construction of an expensive marine oil production platform can be avoided by using an underwater production technology, so that a large amount of construction investment is saved, and the anti-sinking plate is an important basic form of an underwater production system; meanwhile, offshore wind power is used as a renewable clean energy and becomes a new direction for relieving the situation of global energy shortage. Both structures can bear complex environmental loads and working loads of different degrees in the service process, so that the foundation of the two structures needs to have good composite bearing performance, including vertical bearing capacity, horizontal bearing capacity, bending moment bearing capacity and uplift bearing capacity.

The circular shallow foundation is a traditional foundation, has the characteristics of good economy and wide application range, has extremely excellent vertical limit bearing capacity, and is a foundation form with good application prospect. But compared with the vertical bearing performance, the anti-overturning and anti-sliding capability, especially the anti-pulling capability, is relatively weak, and the engineering risk of applying the anti-overturning and anti-sliding capability to ocean engineering exists to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a composite circular foundation with a screw pile, which mainly has the main function of controlling and leveling a circular foundation body by the screw pile in the sinking process; in the whole service process, the whole structure formed by the circular foundation and the spiral pile can be well coordinated for bearing, and the composite bearing capacity of the structure is improved.

A composite circular foundation with spiral piles comprises a circular foundation and a plurality of spiral piles arranged on the circular foundation;

the circular foundation is in a cake shape, and a through grouting sleeve for inserting the screw pile is distributed on the surface of the circular foundation;

the spiral pile comprises a spiral pile upper structure, a spiral pile middle structure, a spiral pile lower structure, a first circular steel plate and a second circular steel plate, wherein the first circular steel plate is clamped between the spiral pile upper structure and the spiral pile middle structure through a flange structure, the second circular steel plate is clamped between the spiral pile middle structure and the spiral pile lower structure through a flange structure, and the lower end of the spiral pile lower structure is provided with a spiral blade;

the spiral pile is inserted into each grouting sleeve of the circular foundation, so that a first circular steel plate covers the upper part (positioned on the upper surface of the circular foundation) of the grouting sleeve, the diameters of the first circular steel plate and the second circular steel plate are larger than the inner diameter of the grouting sleeve, and the whole spiral pile can freely rotate in the grouting sleeve;

concrete filler is filled in the grouting sleeve (including the gap between the upper part of the second round steel plate and the round foundation) and is used for combining the spiral pile and the round foundation into a whole after the sinking installation of the round foundation is finished.

In the above technical solution, each of the grouting sleeves (screw piles) is located on a circular side line concentric with the circular foundation.

In the above technical scheme, the number of the spiral piles is more than or equal to 2, and each spiral pile is centrosymmetric with the circle center of the circular foundation.

In the technical scheme, the diameter of the screw pile (middle structure) is smaller than that of the circular foundation grouting sleeve, so that the friction resistance of the screw pile during rotation is reduced, and the torque required to be applied in the installation process is reduced.

In the technical scheme, the grouting pipe is arranged in the spiral pile and used for pouring concrete filler into the grouting sleeve.

In the above technical scheme, the lower end opening of the grouting pipe is located on the outer wall of the screw pile middle structure body (located in the grouting sleeve).

In the technical scheme, the composite circular foundation further comprises an external power mechanism for screwing the spiral pile into the soil body, and the external power mechanism applies torsion to the top end of the spiral pile.

In the technical scheme, an external counterweight for generating sinking force is placed on the circular foundation.

In the technical scheme, the circular foundation is provided with a lifting ring for lifting.

A construction method of a composite circular foundation with a spiral pile is carried out according to the following steps:

step one, assembling the spiral pile and the circular foundation on land: placing the middle structure of the spiral pile into a grouting sleeve of a circular foundation, clamping a first circular steel plate between the upper structure of the spiral pile and the middle structure of the spiral pile, fixedly connecting the first circular steel plate with a flange, and clamping a second circular steel plate between the middle structure of the spiral pile and the lower structure of the spiral pile, and fixedly connecting the second circular steel plate with the flange;

secondly, hoisting the circular foundation and the spiral pile to a target placement water area, and enabling the spiral pile to partially penetrate into the mud surface under the action of self weight or an external counterweight;

under the drive of an external power device, each spiral pile rotates around a rotating shaft of the spiral pile, a spiral blade penetrating into a mud surface part generates downward penetrating force under the rotating action, and the circular foundation is penetrated to a preset depth under the combined action of the penetrating force and self weight;

and step four, pouring hydraulic concrete into the grouting sleeve on the circular foundation by using the grouting pipe, and enabling the circular foundation and each screw pile to form an integral and cooperative load after the concrete generates enough strength.

The utility model discloses an advantage and beneficial effect do:

the utility model provides a compound circular foundation with screw pile, this structural style combines circular shallow layer foundation form and screw pile foundation form, implants the screw pile in the circular foundation outside, through the rotation of control screw pile, produces the downward injection force, transmits to circular foundation through flange and circular steel sheet to drive circular foundation and sink to preset position; after the sinking is finished, hydraulic concrete is poured into the joint of the spiral pile and the circular foundation grouting sleeve through the grouting pipe prefabricated in the structure, the circular foundation body is restrained by the spiral pile, so that the structure integrally bears horizontal load, overturning load and uplifting load, and the composite bearing performance of the structure is improved.

Drawings

Fig. 1 is a front view of a composite circular foundation with screw piles according to the present invention;

fig. 2 is a top view of a composite circular foundation with screw piles according to the present invention;

FIG. 3 is a cross-sectional view A-A' of FIG. 2;

FIG. 4 is a top view of a circular base;

FIG. 5 is a front view of a screw pile superstructure;

FIG. 6 is an elevation view of a middle structure of a screw pile;

FIG. 7 is a front view of a screw pile substructure;

FIG. 8 is a top view of a screw pile superstructure;

FIG. 9 is a top view of a central structure of a screw pile;

FIG. 10 is a top view of a screw pile substructure; (ii) a

Fig. 11 is a front view of a flange connecting an upper structure of a screw pile and a middle structure of the screw pile (a front view of a flange structure 5-2 is similar thereto);

fig. 12 is a plan view of a flange connecting the screw pile upper structure and the screw pile middle structure (a plan view of the flange structure 5-2 is similar thereto);

FIG. 13 is a cross-sectional view B-B' of FIG. 7;

FIG. 14 is a top view of a circular steel plate;

fig. 15 is a schematic view of the partial structure of the grouting sleeve after the grouting operation is completed.

In the above figures: 1 is a circular base; 1-1 is a circular base body; 1-2 is a grouting sleeve; 2, the upper structure of the spiral pile; 2-1 is a spiral pile upper structure body; 2-2 is an upper flange of the upper structure of the spiral pile; 3, a spiral pile middle structure; 3-1 is a spiral pile middle structure body; 3-2 is a lower flange of the middle structure of the spiral pile; 3-3 is a structural upper flange in the middle of the spiral pile; 4, a spiral pile lower structure; 4-1 is a lower structure body of the spiral pile; 4-2 is a lower flange of a lower structure of the spiral pile; 4-3 are helical blades; 5 is a flange structure; 5-1 is a flange for connecting the upper structure of the spiral pile and the middle structure of the spiral pile; 5-2 is a flange for connecting the middle structure of the spiral pile and the lower structure of the spiral pile; 6 is a round steel plate; 6-1 is a first round steel plate (namely, a round steel plate in the middle of the flange 5-1); 6-2 is a second round steel plate (namely, a round steel plate in the middle of the flange 5-2); 7 is a bolt and nut structure; 8 is a grouting pipe; and 9 is a concrete filler.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

In order to make the technical field person understand the solution of the present invention better, the technical solution of the present invention is further described below with reference to the specific embodiments.

Example 1

A composite circular foundation with a spiral pile comprises a circular foundation 1, a spiral pile upper structure 2, a spiral pile middle structure 3, a spiral pile lower structure 4 and external power equipment.

Pre-grouting a sleeve 1-2 at the outer side of the circular foundation body 1-1;

an upper flange 2-2 is welded on the lower edge of the upper structure body 2-1 of the spiral pile;

a lower flange 3-2 is welded on the upper edge of a middle structure body 3-1 of the spiral pile, and an upper flange 3-3 is welded on the lower edge;

the upper part of the lower structure body 4-1 of the spiral pile is welded with a lower flange 4-2, and the lower part is welded with a spiral blade 4-3.

The upper flange 2-2 and the lower flange 3-2 clamp the first round steel plate 6-1 at the middle position by utilizing a bolt and nut structure 7 to jointly form a pair of flange structures 5-1, and the upper structure 2 of the spiral pile and the middle structure 3 of the spiral pile are connected into a whole; the upper flange 4-2 and the lower flange 3-3 load the second round steel plate 6-2 to the middle position by using a bolt and nut structure 7 to jointly form a pair of flange structures 5-2,

the middle structure 3 of the spiral pile and the lower structure 4 of the spiral pile are connected into a whole, and the second round steel plate 6-2 between the upper flange 4-2 and the lower flange 3-3 aims at discharging soil on the lower side of the grouting sleeve 1-2 in the foundation sinking process, so that the grouting sleeve 1-2 is kept relatively clean, concrete is conveniently injected in the later period, and the connection between the concrete and the spiral pile and the round foundation 1 is facilitated,

the second circular steel plate 6-2 may also be installed or not according to actual requirements and the relative size between the flange structure 5-2 and the grouting sleeve 1-2.

The diameter of the flange structure 5 should be smaller than the diameter of the circular foundation grouting sleeve 1-2 to reduce the frictional resistance of the screw pile during rotation and reduce the torque required to be applied during installation, and the diameter of the circular steel plate 6-1 should be larger than the diameter of the circular foundation grouting sleeve 1-2 to transfer the penetration force generated by the screw pile to the circular foundation 1. After the screw pile is installed, a rigid grouting pipe 8 is installed inside the screw pile, so that concrete can be conveniently injected between the circular foundation grouting sleeve 1-2 and the screw pile in the later stage.

The penetration load generated by the helical blades 4-3 is transmitted to the round foundation 1 through the helical pile lower part structure body 4-1, the lower flange 4-2, the round steel plate 6-2, the upper flange 3-3, the helical pile middle part structure body 3-1, the lower flange 3-2 and the round steel plate 6-1, so that the whole foundation can be penetrated to a preset position. After the foundation is sunk, hydraulic concrete is injected through the grouting pipe 8, and after the concrete forms strength, the circular foundation 1 and the spiral pile form an integral and cooperative load bearing, so that the integral composite bearing capacity of the structure is improved.

Example 2

When the utility model is assembled on land, the lower structure 4 of the screw pile is erected by a crane and restrained by other structures to keep the lower structure upright; hoisting the middle structure 3 of the spiral pile by using a crane, mutually matching an upper flange 3-3 of the lower edge of the middle structure 3 of the spiral pile, a lower flange 4-2 of the upper edge of the lower structure 4 of the spiral pile and a second circular steel plate 6-2, and screwing a bolt and a nut 7 at the flange 5-2 by using a manual method to rigidly combine the lower structure 4 of the spiral pile and the middle structure 3 of the spiral pile; hoisting the first circular foundation 1 by using a crane, and enabling a grouting sleeve 1-2 on the circular foundation 1 to penetrate through the middle structure 3 of the spiral pile; and finally, hoisting the upper structure 2 of the screw pile by using a crane, mutually matching an upper flange 2-2 structure of the lower edge of the upper structure 2 of the screw pile, a lower flange 3-2 structure of the upper edge of the middle structure 3 of the screw pile and a first circular steel plate 6-1, and screwing a bolt and a nut 7 at the flange 5-1 by using a manual method to rigidly combine the upper structure 2 of the screw pile and the middle structure 3 of the screw pile, wherein a grouting pipe 8 is placed inside the screw pile in the process. After the land assembly is finished, the circular foundation 1 is driven by a crane to hoist the screw pile structure to a water area, so that the transportation is convenient.

Example 3

When the utility model is sunk, the whole structure is hoisted to a preset place, the spiral pile part is penetrated below a mud surface under the action of dead weight or external balance weight, the spiral pile can rotate around a rotating shaft of the spiral pile under the driving of an external power device, a spiral blade 4-3 penetrating into the mud surface part can generate downward penetrating force under the action of rotation, and the penetrating force is transmitted to a circular foundation 1 through a spiral pile lower part structure body 4-1, a flange 5-2, a spiral pile middle part structure body 3-1, a flange 5-1 and a circular steel plate 6-1 in sequence to drive the circular foundation 1 to be sunk to a preset position; the inclination degree of the circular foundation 1 can be controlled by changing the rotation speed of the spiral piles at different positions in the sinking process, the bottom surface of the circular foundation 1 is ensured to be in complete contact with a seabed mud surface after the sinking is finished, and the circular foundation body 1 can be ensured to have good vertical bearing performance after the construction is finished. After the sinking is finished, hydraulic concrete is poured into the grouting sleeve 1-2 in the circular foundation by the grouting pipe 8, and after the concrete has enough strength, the circular foundation 1 and the spiral pile form an integral and cooperative load, so that the integral composite bearing capacity of the structure is improved.

Example 4

When the utility model works, the concrete in the grouting sleeve 1-2 restrains the circular foundation 1 and the spiral pile into a whole, the load transmitted by the upper structure is jointly born by the spiral pile and the circular foundation 1, wherein the circular foundation 1 has good vertical bearing capacity; the spiral pile has good anti-sliding, anti-overturning and anti-pulling capacities, so that when the foundation bears loads in different directions, horizontal loads, overturning loads and upward pulling loads can be completely transmitted to the spiral pile through concrete and related structures, and the horizontal loads, the overturning loads and the upward pulling loads can fully exert respective bearing advantages through cooperative work of the concrete and the related structures, so that the overall structure has excellent composite bearing performance. The number and the size of the spiral piles and the space and the size of the spiral blades 4-3 are designed according to the requirement of the integral bearing capacity of the structure; the spiral piles should be uniformly distributed with the central axis of the circular foundation 1 as a symmetry center to ensure that the circular foundation 1 does not generate differential settlement during the settling process.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings). In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. 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 being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The invention has been described above by way of example, and it should be noted that any simple variants, modifications or other equivalent substitutions by a person skilled in the art without spending creative effort may fall within the scope of protection of the present invention without departing from the core of the present invention.

Claims (9)

1. The utility model provides a compound circular basis with screw pile which characterized in that: comprises a circular foundation and a plurality of spiral piles arranged on the circular foundation;

the circular foundation is in a cake shape, and a through grouting sleeve for inserting the screw pile is distributed on the surface of the circular foundation;

the spiral pile comprises a spiral pile upper structure, a spiral pile middle structure, a spiral pile lower structure, a first circular steel plate and a second circular steel plate, wherein the first circular steel plate is clamped between the spiral pile upper structure and the spiral pile middle structure through a flange structure, the second circular steel plate is clamped between the spiral pile middle structure and the spiral pile lower structure through a flange structure, and the lower end of the spiral pile lower structure is provided with a spiral blade;

the spiral pile is inserted into each grouting sleeve of the circular foundation, so that the first circular steel plate covers the grouting sleeve, the diameter of the first circular steel plate and the diameter of the second circular steel plate are larger than the inner diameter of the grouting sleeve, and the whole spiral pile can freely rotate in the grouting sleeve;

concrete filler is filled in the grouting sleeve and used for combining the spiral pile and the circular foundation into a whole after the circular foundation is sunk and installed.

2. The composite circular foundation with the screw pile according to claim 1, wherein: each grouting sleeve is positioned on a circular side line concentric with the circular foundation.

3. The composite circular foundation with the screw pile according to claim 1, wherein: the number of the spiral piles is more than or equal to 2, and each spiral pile is centrosymmetric around the circle center of the circular foundation.

4. The composite circular foundation with the screw pile according to claim 1, wherein: the diameter of the spiral pile is smaller than that of the circular foundation grouting sleeve.

5. The composite circular foundation with the screw pile according to claim 1, wherein: and a grouting pipe is arranged in the spiral pile and used for grouting concrete filler into the grouting sleeve.

6. A composite round foundation with screw piles according to claim 5, wherein: and the lower end opening of the grouting pipe is positioned on the outer wall of the spiral pile middle structure body.

7. The composite circular foundation with the screw pile according to claim 1, wherein: the composite circular foundation further comprises an external power mechanism for screwing the spiral pile into the soil body, and the external power mechanism applies torsion to the top end of the spiral pile.

8. The composite circular foundation with the screw pile according to claim 1, wherein: and an external counterweight for generating sinking force is placed on the circular foundation.

9. The composite circular foundation with the screw pile according to claim 1, wherein: and a lifting ring for lifting is arranged on the circular foundation.

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