CN212506360U - High pile cap foundation based on pile screwing - Google Patents
High pile cap foundation based on pile screwing Download PDFInfo
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- CN212506360U CN212506360U CN202020397691.4U CN202020397691U CN212506360U CN 212506360 U CN212506360 U CN 212506360U CN 202020397691 U CN202020397691 U CN 202020397691U CN 212506360 U CN212506360 U CN 212506360U
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- 239000002689 soil Substances 0.000 claims abstract description 39
- 238000010276 construction Methods 0.000 abstract description 21
- 238000009434 installation Methods 0.000 abstract description 6
- 238000010009 beating Methods 0.000 abstract description 3
- 239000011440 grout Substances 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 17
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000010008 shearing Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
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Abstract
The utility model belongs to the technical field of structural foundation, and discloses a high pile bearing platform foundation based on rotary driving piles, wherein the lower part of the bearing platform is connected with a vertical rotary driving pile and a plurality of inclined rotary driving piles, and the top of the bearing platform is connected with a central cylinder; at least one layer of rotation bearing blades are arranged on the outer sides of the soil entering sections of the vertical rotation driving pile and the inclined rotation driving pile, stiffening ribs are arranged on the outer sides of the connection sections of the vertical rotation driving pile and the inclined rotation driving pile, and shear keys are arranged on the inner sides of the connection sections of the vertical rotation driving pile and the inclined rotation driving pile. The utility model adopts the rotary pile as the pile group structure, the contact between the pile body and the soil body can be increased by the rotary pile, and the bearing capacity of the foundation in the soft soil layer is improved; the pile length of the rotary pile can be reduced compared with the original single pile, and a pile hammer with smaller energy than the original pile body is selected for construction, so that the construction is more convenient, and the construction cost and the installation cost are lower; pile will be revolved through the downthehole grout of guide pile and will be revolved in the beating and pile combines with the cushion cap, can effectively improve the wholeness that both are connected, ensures that the structure load effectively transmits.
Description
Technical Field
The utility model belongs to the technical field of the structure basis, specific theory relates to a high pile cap basis.
Background
The high pile cap foundation is a foundation structure of a post-cast concrete cap on a pile group foundation, and the pile group foundation mostly adopts inclined piles to resist horizontal load of a fan, has the advantages of high bearing capacity, good stability and the like, is a more economic and reasonable fan foundation form, and is widely applied in the field in recent years.
The traditional process of the high pile cap foundation adopts a pile driving boat for construction, when harder rocks are difficult to drive into the pile driving process or a soft interlayer exists at the bottom of a soil layer, the phenomena of pile slipping and the like possibly occur in the pile driving process, so that the construction efficiency is low, the steel pile is easy to damage, accidents occur, the problems of incapability of ensuring the bearing performance of the foundation and the like even occur, and the expansion use of the high pile cap foundation is restricted.
SUMMERY OF THE UTILITY MODEL
The utility model discloses exerting oneself in solving the foundation and weak or hard the time high pile cap basis bearing capacity not enough and the comparatively difficult technical problem of construction, provide a high pile cap basis based on beat pile soon, the basic stability is better, construction simple to operate, and installation cost is lower, can make the more extensive actual engineering of being applied to of high pile cap basis.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a high pile cap foundation based on a pile driver comprises a cap, wherein a vertical pile driver corresponding to the center of the cap and a plurality of inclined pile drivers annularly arranged around the vertical pile driver are arranged at the lower part of the cap; a central cylinder is arranged at the top of the bearing platform; the vertical rotary driving pile, the inclined rotary driving pile and the central cylinder are connected with the bearing platform in a grouting manner; stiffening ribs are arranged on the outer sides of the connecting sections of the vertical rotary driving piles, the inclined rotary driving piles and the bearing platform, and shear keys are arranged on the inner sides of the connecting sections; and at least one layer of screwing bearing blades are arranged on the outer sides of the vertical screwing pile and the inclined screwing pile, and the screwing bearing blades are used for screwing into the foundation.
Furthermore, the bearing platform is provided with grouting holes for pile guiding and grouting corresponding to the vertical rotary driving pile and the inclined rotary driving pile.
Further, the bearing platform is provided with an annular groove for embedding and grouting corresponding to the central cylinder.
Further, a soft soil layer exists in a foundation in-place site, and the helical blades are arranged at the height of the positions of the vertical rotary driving piles and the inclined rotary driving piles corresponding to the soft soil layer in the in-place state of the foundation.
Further, a hard soil layer exists in a foundation in-place site, and the helical blades are arranged at the bottoms of the vertical rotary driving pile and the inclined rotary driving pile.
Further, the spin bearing blades are inclined, are uniformly arranged around the axis of the pile body, and have the same inclination direction, and the inclination angle is 30-150 degrees.
Further, the spin bearing blades are spiral, are uniformly arranged around the axis of the pile body, and have the same rotating direction and the spiral angle of 18-360 degrees.
The utility model has the advantages that:
firstly, the high pile bearing platform foundation of the utility model adopts the rotary piles as the pile group structure, the rotary piles can increase the contact between the pile body and the soil body, and the bearing capacity of the foundation in the soft soil layer is improved;
secondly, the bearing capacity of the high pile bearing platform foundation of the utility model is larger, so the pile length of the rotary pile can be reduced compared with the original single pile, the rotary bearing blade of the rotary pile has a certain shearing effect on the soil body, and a pile hammer with smaller energy than the original pile body can be selected for construction; therefore, the construction is more convenient, and the construction cost and the installation cost are lower;
thirdly, the outer side of the part, embedded into the bearing platform, of the pile is provided with stiffening ribs, the inner side of the pile is provided with shear keys, and the pile is combined with the bearing platform through grouting in the pile guide holes after the pile is in place, so that the connection integrity of the pile and the bearing platform can be effectively improved, and the effective transmission of structural load is ensured;
(IV) the utility model discloses the pile hole of reserving on the cushion cap can make the cushion cap as the pile guide frame, for the installation guide direction of beating the pile soon to one side, ensures to beat the pile soon to one side according to the direction screw in soil body of design, is favorable to promoting the precision of construction, and the work progress is more convenient.
Drawings
Fig. 1 is a schematic perspective view of a high-rise pile cap foundation provided in embodiment 1;
FIG. 2 is a top view of the high pile cap foundation provided in example 1;
FIG. 3 is a front view of the high pile cap foundation provided in example 1;
fig. 4 is a schematic perspective view of a vertical pile driver in a high pile cap foundation according to embodiment 1;
FIG. 5 is a schematic structural view of a pitch shaped swirl carrying vane;
FIG. 6 is a schematic structural view of a helical swirl bearing blade;
fig. 7 is a schematic perspective view of a high pile cap foundation provided in embodiment 2;
fig. 8 is a schematic perspective view of a slant pile driving pile in a high pile cap foundation according to embodiment 2.
In the above figures: 1. the pile comprises a central cylinder, 2, a bearing platform, 3, vertical rotary driving piles, 4, inclined rotary driving piles, 5, rotary bearing blades, 6, stiffening ribs, 7 and shear keys.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
example 1
As shown in fig. 1 to 3, the present embodiment discloses a high pile cap foundation based on a swing pile, which mainly comprises a central cylinder 1, a cap 2, a vertical swing pile 3 and a slant swing pile 4. The central tube 1 is connected to the upper part of the bearing platform 2, and the vertical rotary pile 3 and the inclined rotary pile 4 are connected to the lower part of the bearing platform 2.
The central cylinder 1 is of a steel cylinder structure, has the diameter of 9m and the height of 12m, and is arranged coaxially with the bearing platform 2; the bottom 6m of the central cylinder 1 is embedded into the upper part of the bearing platform 2, and the top is connected with the upper structure through a flange.
The bearing platform 2 is of a disc-shaped precast concrete structure, the diameter is 18m, and the height is 8 m; besides the disk-shaped structure, the structure can also be a structure with other cross section shapes of central symmetry, such as a regular polygon. The bearing platform 2 is provided with an annular groove corresponding to the central cylinder 1, the bottom of the central cylinder 1 can be inserted into the annular groove, and the central cylinder 1 is connected with the bearing platform 2 through internal grouting to ensure the integrity of the foundation.
The top of 1 vertical rotary driving pile 3 is embedded into the center position of the bottom of the bearing platform 2, 6 inclined rotary driving piles 4 are uniformly arranged in a circular manner by taking the axis of the vertical rotary driving pile 3 as the center and 6m as the radius; beat to one side and revolve stake 4 and lean out gradually from top to bottom, the slope rate 1: 8. the vertical rotary driving pile 3 and the inclined rotary driving pile 4 are both made of steel materials, and a top pile head 2m is embedded into the bearing platform 2; the length of the vertical rotary pile 3 is 30m, and the bottoms of the vertical rotary pile 3 and each inclined rotary pile 4 are positioned at the same horizontal position. Generally, the number of the inclined driving rotary piles 4 is 6-16, and the mud penetration depth of the vertical driving rotary piles 3 and each inclined driving rotary pile 4 is 10-100 m.
Referring to fig. 4, vertical pile 3 and slant pile 4 have the same structure, and this embodiment will be described by taking vertical pile 3 as an example. The mud feeding part of the vertical rotary pile 3 is provided with at least one layer of rotary bearing blades 5, the outer side of the top is provided with stiffening ribs 6, and the inner side is provided with shear keys 7. The screwing bearing blade 5, the stiffening rib 6 and the shear key 7 are all welded on the pile body of the vertical screwing pile 3.
According to the soil conditions of the in-place site of different foundations, the rotary bearing blades 5 can be arranged at different heights outside the pile body of the vertical rotary pile 3. If a soft soil layer exists in the foundation in-place site, the rotary bearing blades 5 are arranged at the height of the vertical rotary pile 3 corresponding to the position of the soft soil layer in the in-place state of the foundation, the rotary bearing blades 5 provide main bearing capacity, the length and the diameter of a pile body can be reduced, and construction is convenient. The utility model discloses the soft soil layer that indicates include but not limited to be in the soft stickness soil layer of moulding/flowing the state of moulding, be in loose state's sand soil layer, untreated fill out soil and other high compressibility soil layers. If there is the great hardpan of intensity that is difficult to pile in the place of basic site of taking one's place, can arrange at the 3 bottoms of vertical pile of whirling and beat and revolve bearing blade 5, the 3 bottoms of vertical pile of whirling of taking one's place of basic back fall in hardpan top, beat and revolve bearing blade 5 and provide main bearing capacity, make vertical pile of whirling 3 need not insert the hardpan, need not to excavate the construction to make pile body length reduce, construction convenience. The utility model discloses the hardpan that points to includes but not limited to rock layer, coarse gravel layer, metalling.
The swirl bearing blades 5 may be inclined or helical. As shown in fig. 5, the inclined whirl-bearing blades 5 include a plurality of blades which are uniformly arranged around the shaft axis and have the same inclination direction; the inclined rotary bearing blade 6 is simple in processing and blanking, high in processing speed and short in manufacturing period. Preferably, each inclined swirling bearing blade 5 is of a planar sheet structure, the inner side of the inclined swirling bearing blade is welded to the surface of the pile body in a fitting mode, and the outer side of the inclined swirling bearing blade is parallel to the intersecting line of the inner side and the pile body, so that the width of the swirling bearing blade 5 along the way is consistent. Preferably, the number of the inclined rotary bearing blades 5 is 2-20, the inclination angle is 30-150 degrees, the width is 0.1-10 m, and the thickness is 1-200 mm. More preferably, the inclination angle of the inclined rotary bearing blade 5 is 45-135 degrees, the inclination angle in the range can better form an interaction mode with the soil body, and the rotary bearing blade 5 is ensured to be more beneficial to shearing the soil body. As shown in fig. 6, the helical whirl-bearing blades 5 comprise at least one, which are uniformly arranged around the axis of the pile body and have consistent rotation direction; the spiral screwing bearing blade 5 can effectively reduce the sinking resistance of the pile body and reduce the hammering energy and times in the screwing process. Preferably, the number of the spiral rotation bearing blades 5 is 1-20, the spiral angle is 18-360 degrees, the width is 0.1-10 m, and the thickness is 1-200 mm. More preferably, the spiral angle of the spiral rotation bearing blade 5 is 45-135 degrees, and the inclination angle in the range can better form an interaction mode with the soil body, so that the rotation bearing blade 5 is ensured to be more beneficial to shearing the soil body.
The width of the rotation bearing blade 5 can be changed along the elevation according to the soil body strength and pile body stress of different soil layers, the width of the weak part of the soil body is wider, and the width of the strong part of the soil body is narrower. During construction, a universal piling device can be selected for piling, the vertical rotary pile 3 automatically rotates downwards to enter a mud surface under the interaction of the rotary bearing blades 5 and a soil body, and the rotary bearing blades 5 with large cross-sectional areas provide large bearing capacity for a foundation after the rotary bearing blades 5 are in place. Moreover, the bearing capacity of the high pile cap foundation is larger, the length of the vertical rotary driving pile 3 can be reduced compared with the original common single pile, the construction is convenient, and the construction cost and the installation cost are low; because the rotary bearing blades 5 have a certain shearing effect on the soil body, the vertical rotary pile 3 can be a pile hammer with smaller energy than the original common single pile body, and the installation cost is reduced.
The top outside of pile 3 is revolved in vertical beating is provided with stiffening rib 6, the inboard is equipped with shear force key 7, and the concrete structure of stiffening rib 6 and shear force key 7 does not do strict restriction, all is used for the increase with grouting material's area of contact, promotes joint strength to improve the vertical pile 3 of revolving and the connection wholeness of cushion cap 2, ensure the effective transmission of structural load. In this embodiment, the stiffening ribs 6 are a plurality of layers of annular fins arranged at intervals in the height direction, and the shear keys 7 are vertical fins uniformly distributed in the radial direction.
The above description of the structure of vertical pile 3 applies equally to diagonal pile 4.
The bearing platform 2 is respectively reserved with grouting holes corresponding to the vertical rotary driving pile 3 and the inclined rotary driving pile 4, the diameter of the grouting holes is larger than the maximum diameter of the vertical rotary driving pile 3/the inclined rotary driving pile 4, and the vertical rotary driving pile 3/the inclined rotary driving pile 4 can be smoothly inserted. Vertical pile 3/beat soon stake 4 to one side and insert the grout hole and install and adopt the grout mode to be connected with cushion cap 2 after targetting in place, effectively improve the wholeness that vertical pile 3/beat soon stake 4 and cushion cap 2 are connected to one side, ensure that the structural load effectively transmits to vertical pile 3 and beat soon stake 4 to one side through cushion cap 2, guarantee that overall structure atress is even. The bearing platform 2 can be set to a blind hole corresponding to the grouting hole of the vertical rotary pile 3, and the bearing platform 2 can be installed on the upper portion of the vertical rotary pile 3. The grouting hole of the bearing platform 2 corresponding to the inclined rotary pile 4 is a through hole, and the grouting hole is also a pile guide channel, so that the bearing platform 2 serves as a pile guide frame, and the inclined rotary pile 4 is smoothly driven into the pile guide frame from the grouting hole after the bearing platform 2 is installed, so that the construction precision is guaranteed, and the construction efficiency is improved.
The construction method of the high pile cap foundation based on the driven-rotated piles comprises the following steps:
(1) prefabricating a central cylinder 1, a bearing platform 2, a vertical rotary pile 3 and an inclined rotary pile 4, wherein a grouting hole corresponding to the vertical rotary pile 3 and a grouting hole corresponding to the inclined rotary pile 4 are reserved in the bearing platform 2;
(2) and piling the vertical rotary pile 3 to a designed elevation by adopting universal piling hammer equipment.
(3) A platform template is erected on the upper part of the vertical rotary driving pile 3, and a prefabricated bearing platform 2 is installed; and grouting in the grouting hole corresponding to the vertical screwing pile 3 by using the high-strength grouting material so as to connect the vertical screwing pile 3 with the bearing platform 2.
(4) Inserting the oblique rotary pile 4 through a grouting hole of the bearing platform 2, adopting a universal pile driving hammer device to drive the oblique rotary pile 4 to a designed height, enabling the stiffening rib 6 and the shear key 7 at the top of the oblique rotary pile 4 to completely enter the bearing platform 2, and grouting in the grouting hole corresponding to the oblique rotary pile 4 by utilizing high-strength grouting material to enable the oblique rotary pile 4 to be connected with the bearing platform 2.
(5) And (3) inserting the central cylinder 1 into an annular groove reserved in the bearing platform 2, and grouting in the annular groove by using high-strength grouting material to connect the central cylinder 1 with the bearing platform 2.
In the piling process of the step (2) and the step (4), along with the downward hammering acting force of the piling hammer equipment, the vertical rotary pile 3 or the inclined rotary pile 4 automatically rotates downwards to enter the soil under the interaction of the rotary bearing blade 5 and the soil body, and the rotary bearing blade 5 has a certain shearing effect on the foundation along with the rotation process, so that the surrounding soil body is disturbed, the strength of the surrounding soil body is weakened, and the vertical rotary pile 3 or the inclined rotary pile 4 gradually turns into the soil body with the weakened strength under the action of the self torsion, so that the construction is convenient and rapid.
Example 2
As shown in fig. 7 and 8, embodiment 2 differs from embodiment 1 only in the specific structure of vertical pile 3 and diagonal pile 4.
The vertical pile 3 and the diagonal pile 4 of example 2 have the same structure, and here, the diagonal pile 4 is described as an example. And (3) reducing the diameter of the part of the oblique rotary pile 4 where the rotary bearing blades 5 are arranged, wherein the sum of the reduced pile body and the rotary bearing blades 5 is consistent with the main pile diameter of the oblique rotary pile 4, and the oblique rotary pile is suitable for the condition that the whole diameter of the oblique rotary pile 4 is limited. In addition, the diameter of the pile body section connected with the inclined driving rotary pile 4 and the driving rotary bearing blade 5 is reduced, so that the purposes of small disturbance range of the surrounding soil body and small grouting range after the soil body is in place can be achieved.
The diameter of the part, embedded into the pile head, of the bearing platform 2 of the inclined rotary pile 4 is gradually reduced from bottom to top, and the width of the stiffening rib 6 arranged on the outer side of the top of the inclined rotary pile 4 is also changed along with the height of the pile body, so that the sum of the reduced pile body and the stiffening rib 6 is kept unchanged. Thus, the contact area of the grouting part is increased while the pile bearing performance is increased, and the grouting part has enough strength. The shear keys 7 are uniformly distributed in a multilayer radial direction and are arranged at a certain angle with the pile body, so that the connection strength is ensured.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make various changes without departing from the spirit and the scope of the invention as claimed.
Claims (7)
1. A high pile cap foundation based on pile screwing comprises a cap and is characterized in that a vertical pile screwing corresponding to the center of the cap and a plurality of inclined pile screwing annularly arranged around the vertical pile screwing are arranged at the lower part of the cap; a central cylinder is arranged at the top of the bearing platform; the vertical rotary driving pile, the inclined rotary driving pile and the central cylinder are connected with the bearing platform in a grouting manner; stiffening ribs are arranged on the outer sides of the connecting sections of the vertical rotary driving piles, the inclined rotary driving piles and the bearing platform, and shear keys are arranged on the inner sides of the connecting sections; and at least one layer of screwing bearing blades are arranged on the outer sides of the vertical screwing pile and the inclined screwing pile, and the screwing bearing blades are used for screwing into the foundation.
2. The high pile cap foundation of claim 1, wherein the cap is provided with grouting holes for pile guiding and grouting corresponding to the vertical pile and the inclined pile.
3. A high pile cap foundation based on driven piles according to claim 1, characterized in that the cap is provided with an annular groove for embedment and grouting in correspondence with the central tube.
4. The high pile cap foundation based on the screwing pile of claim 1, wherein a soft soil layer exists in a foundation in-place site, and the screwing bearing blades are arranged at the height of the vertical screwing pile and the inclined screwing pile corresponding to the soft soil layer in the foundation in-place state.
5. The high pile cap foundation based on the driven rotary piles as claimed in claim 1, wherein the driven rotary bearing blades are arranged at the bottoms of the vertical driven rotary piles and the inclined driven rotary piles when hard soil layers exist in a foundation in-place site.
6. A high pile cap foundation based on a pile driver according to claim 1, wherein the said driver carrying blades are inclined, evenly arranged around the shaft axis and with the same inclination direction, and the inclination angle is 30-150 °.
7. The high pile cap foundation of claim 1 wherein the spin bearing blades are helical, are uniformly arranged around the axis of the pile body and rotate in the same direction, and have a helix angle of 18-360 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020397691.4U CN212506360U (en) | 2020-03-25 | 2020-03-25 | High pile cap foundation based on pile screwing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020397691.4U CN212506360U (en) | 2020-03-25 | 2020-03-25 | High pile cap foundation based on pile screwing |
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| Publication Number | Publication Date |
|---|---|
| CN212506360U true CN212506360U (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020397691.4U Active CN212506360U (en) | 2020-03-25 | 2020-03-25 | High pile cap foundation based on pile screwing |
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|---|---|
| CN (1) | CN212506360U (en) |
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2020
- 2020-03-25 CN CN202020397691.4U patent/CN212506360U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210910 Address after: 300072 tiandaxinyuan village, Nankai District, Tianjin Patentee after: Ding Hongyan Patentee after: Zhang Puyang Patentee after: Shanghai East Ocean Engineering Technology Co.,Ltd. Address before: 200434 Shanghai city Hongkou District Yixian Road No. 388 Patentee before: SHANGHAI INVESTIGATION, DESIGN & RESEARCH INSTITUTE Co.,Ltd. Patentee before: Ding Hongyan Patentee before: Zhang Puyang Patentee before: Shanghai East Ocean Engineering Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20231220 Address after: 300072 tiandaxinyuan village, Nankai District, Tianjin Patentee after: Ding Hongyan Patentee after: Zhang Puyang Patentee after: Shanghai East Ocean Engineering Technology Co.,Ltd. Patentee after: SHANGHAI INVESTIGATION, DESIGN & RESEARCH INSTITUTE Co.,Ltd. Address before: 300072 tiandaxinyuan village, Nankai District, Tianjin Patentee before: Ding Hongyan Patentee before: Zhang Puyang Patentee before: Shanghai East Ocean Engineering Technology Co.,Ltd. |