CN212561591U - High-low bearing platform type pile structure and pile foundation system - Google Patents
High-low bearing platform type pile structure and pile foundation system Download PDFInfo
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- CN212561591U CN212561591U CN202021229862.9U CN202021229862U CN212561591U CN 212561591 U CN212561591 U CN 212561591U CN 202021229862 U CN202021229862 U CN 202021229862U CN 212561591 U CN212561591 U CN 212561591U
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Abstract
The utility model relates to a geotechnical engineering field, in particular to high-low pile cap formula pile structure and pile foundation system, wherein high-low pile cap formula pile structure is including the first bearing board of horizontal setting, in at least some of first bearing board stretched into the fill road bed, first bearing board top was connected with the upper portion pile foundation, first bearing board bottom was connected with the lower part pile foundation, be provided with second bearing board on the upper portion pile foundation, in at least some of second bearing board stretched into the fill road bed, second bearing board and first bearing board interval set up. The utility model provides a high low pile cap formula pile structure, not only can offset some fill road bed apply with the forward moment of flexure that the side direction soil pressure of upper portion pile foundation produced the upper portion pile foundation, optimize the atress form of the part that the upper portion pile foundation is located first pile cap board and second pile cap board moreover, reduce and fill the road bed and apply the soil pressure of pile side between second pile cap board and first pile cap board, the pile length and the pile diameter of the upper portion pile foundation that reduce greatly, and then reduce construction cost.
Description
Technical Field
The utility model relates to a geotechnical engineering field, in particular to high-low bearing platform formula pile structure and pile foundation system.
Background
When a railway and a highway are constructed in a mountain area, a filling roadbed is often filled on a slope with a covering layer, and when the filling is high and the slope soil is a thick and weak covering layer, the roadbed slope stability is difficult to meet the standard requirement. In order to ensure the stability of the filled roadbed side slope, a lateral restraining pile is often arranged in the range of a slope toe, and a hole digging pile or a cast-in-situ bored pile can be adopted as the lateral restraining pile. When the pile foundation is located in a section with high cold and oxygen deficiency or a section with a high underground water level, the pile foundation can only adopt the cast-in-place bored pile, and because the bending resistance of the cast-in-place bored pile is poorer than that of the cast-in-place bored pile, the pile top displacement and the pile body bending resistance requirements have to be met by encrypting the pile spacing or increasing the pile diameter, so that the pile top displacement control is difficult, the pile spacing is too small due to large soil pressure after filling high piles, the roadbed investment is too high, and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: aiming at the problems existing in the prior art that when the pile foundation is located in a section with high cold and oxygen deficiency or a higher underground water level, the pile foundation can only adopt a bored pile, and the bending resistance of the bored pile is poorer than that of a bored pile, the pile top displacement and the bending resistance of a pile body are required to be met by encrypting the pile spacing or increasing the pile diameter, so that the control on the pile top displacement is difficult, the pile spacing is too small due to large soil pressure after filling the high pile, and the roadbed investment is too high, a high-low bearing platform type pile structure and a pile foundation system are provided, so that the lateral bending moment borne by the pile body can be reduced, the stress size and the stress form of the pile foundation can be optimized, the pile length and the pile diameter of the pile foundation are greatly reduced, the problems that the control on the pile top displacement is difficult, the pile spacing is too small due to large soil pressure after filling the.
In order to realize the purpose, the utility model discloses a technical scheme be:
the utility model provides a high low bearing platform formula pile structure, includes the first bearing platform board of horizontal setting, at least a part of first bearing platform board stretches into in the fill road bed, first bearing platform board top is connected with the upper portion pile foundation, first bearing platform board bottom is connected with the lower part pile foundation, be provided with the second bearing platform board on the pile foundation of upper portion, at least a part of second bearing platform board stretches into in the fill road bed, the second bearing platform board with first bearing platform board interval is followed the length direction setting of upper portion pile foundation.
The utility model provides a high low pile cap formula pile structure, first pile cap board bottom is connected with the lower part pile foundation, when using, the lower part pile foundation stretches into the ground, supports as the basis of high low pile cap formula pile structure, at least partly stretch into in the fill road bed of first pile cap board to make the fill soil body that the fill road bed is located first pile cap board top act on a vertical force downwards of first pile cap board, produce a negative-going moment that tends to the line side with this to the upper portion pile foundation, offset some fill road bed apply with the positive moment that the lateral soil pressure of upper portion pile foundation produced the upper portion pile foundation, the pile bolck displacement of effective control upper portion pile foundation, thereby the internal force, the pile length and the pile diameter of upper portion pile foundation have been reduced.
And at least one part of the second bearing plate extends into the filling roadbed, so that filling soil mass of the filling roadbed above the second bearing plate acts on the second bearing plate to generate a downward vertical force to the upper pile foundation, and a negative bending moment tending to a line side is generated on the upper pile foundation. Therefore, the stress form of the upper pile foundation is greatly optimized, and the second bearing plate can also reduce the soil pressure of the filling roadbed applied to the pile side between the second bearing plate and the first bearing plate, so that the internal force of the pile foundation is reduced.
Meanwhile, the arrangement of the first bearing plate and the second bearing plate enables the bending moment applied to the upper pile foundation and the lower pile foundation to be distributed uniformly, and the pile length and the pile diameter are further reduced.
To sum up, this application a high low pile cap formula pile structure, through setting up first pile cap board and second pile cap board, not only can offset some fill the road bed apply with the side direction soil pressure of upper portion pile foundation to the forward moment of flexure that upper portion pile foundation produced, optimize the atress form of the part that the upper portion pile foundation is located first pile cap board and second pile cap board moreover, reduce and fill the road bed and apply the second pile cap board with the soil pressure of pile side between the first pile cap board to reduce the pile foundation internal force, thereby reduce the pile length and the pile diameter of upper portion pile foundation greatly, and then reduce construction cost.
Preferably, the number of the second pile cap plates is at least two, and the adjacent second pile cap plates are arranged at intervals along the length direction of the upper pile foundation.
At least two second bearing plates are arranged, the adjacent second bearing plates are arranged at intervals along the length direction of the upper pile foundation, the stress form of the upper pile foundation is optimized in a segmented mode, and the internal force of the pile foundation is reduced more preferably.
Preferably, the upper pile foundation is connected with the first pile cap plate through steel bars, and/or the lower pile foundation is connected with the first pile cap plate through steel bars. So that the connection is firmer.
Preferably, the upper pile foundation and the lower pile foundation are correspondingly arranged, so that the eccentric bending moment load borne by the first bearing plate is reduced.
Preferably, the upper pile foundation penetrates through the first bearing plate and then is connected with the corresponding lower pile foundation, and the upper pile foundation and the corresponding lower pile foundation are integrally cast structural members, so that the whole structure is better in stability.
Preferably, the first bearing plate has a transverse width L1Is [2m, 4m ]]。
Preferably, the second deck plate has a lateral width L2Is [1m, 2m ]]。
Preferably, the lower pile foundation is a reinforced concrete cast-in-situ bored pile, and construction is simple and convenient.
The application also discloses a pile foundation system, includes as this application high low bearing platform formula pile structure, first bearing platform board be located the ground with fill the juncture of road bed.
The application a pile foundation system, first bearing board be located the ground with fill the juncture of road bed, on first bearing board acted on the ground, the ground can provide a reverse bearing power, can effectively reduce the pile foundation anchor section of lower part pile foundation to the side direction extrusion of foundation soil, can reduce the pile length of lower part pile foundation greatly.
Simultaneously, the pile foundation system includes as this application high low pile cap formula pile structure, when using, the lower part pile foundation stretches into the ground, and as the basic support of high low pile cap formula pile structure, at least partly stretch into the fill road bed of first pile cap board to make the fill soil body that the fill road bed is located first pile cap board top act on a downward vertical force of first pile cap board, produce a negative-going moment of bending of inclined to the line side to upper portion pile foundation with this, offset some fill road bed apply with the positive moment of bending that upper portion pile foundation's side soil pressure produced upper portion pile foundation, the pile bolck displacement of effective control upper portion pile foundation, thereby reduced the pile foundation internal force, pile length and the pile diameter of upper portion.
And at least one part of the second bearing plate extends into the filling roadbed, so that filling soil mass of the filling roadbed above the second bearing plate acts on the second bearing plate to generate a downward vertical force to the upper pile foundation, and a negative bending moment tending to a line side is generated on the upper pile foundation. Therefore, the stress form of the upper pile foundation is greatly optimized, and the second bearing plate can also reduce the soil pressure of the filling roadbed applied to the pile side between the second bearing plate and the first bearing plate, so that the internal force of the pile foundation is reduced.
And moreover, the arrangement of the first bearing plate and the second bearing plate enables the bending moment borne by the upper pile foundation and the lower pile foundation to be distributed uniformly, and the pile length and the pile diameter are further reduced.
To sum up, this application a pile foundation system, through setting up first pile cap board and second pile cap board, first pile cap board be located the ground with fill the juncture of road bed to reduce the pile foundation internal force of upper portion pile foundation and lower part pile foundation, thereby reduce the pile length and the pile diameter of upper portion pile foundation and lower part pile foundation greatly, and then reduce construction cost.
Preferably, the upper part of the high-low bearing platform type pile structure is buried in the filling roadbed.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:
1. the application a high low pile cap formula pile structure, through setting up first pile cap board and second pile cap board, not only can offset some fill road bed apply with the forward bending moment of the side direction soil pressure of upper portion pile foundation to the production of upper portion pile foundation, optimize the atress form of the part that the upper portion pile foundation is located first pile cap board and second pile cap board moreover, reduce and fill the road bed and apply the second pile cap board with the soil pressure of pile side between the first pile cap board to reduce the pile foundation internal force, thereby reduce the pile foundation's pile length and pile diameter greatly, and then reduce construction cost.
2. The application a high low bearing platform formula pile structure set up two at least second bearing boards, adjacent the second bearing board is followed upper portion pile foundation length direction interval sets up, and the atress form of upper portion pile foundation is optimized to the subsection, has more reduced the pile foundation internal force optimally.
3. The application a pile foundation system, through setting up first pile cap board and second pile cap board, first pile cap board be located the ground with fill the juncture of road bed to reduce the pile foundation internal force of upper portion pile foundation and lower part pile foundation, thereby reduce the pile length and the pile diameter of upper portion pile foundation and lower part pile foundation greatly, and then reduce construction cost.
Drawings
Fig. 1 is a schematic structural view (front view, a second bearing plate) of a high-low bearing platform type pile structure of the present invention.
Fig. 2 is a schematic structural diagram (front view, two second bearing plates) of a high-low bearing platform type pile structure of the present invention.
Fig. 3 is a schematic structural diagram (overlook) of a high-low bearing platform type pile structure according to the present invention.
Fig. 4 is a schematic structural diagram (cross-sectional profile) of a pile foundation system according to the present invention.
Icon: 1-upper pile foundation; 2-a first deck plate; 3-a second deck plate; 4-lower pile foundation; 5-filling the roadbed; 6-foundation.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
As shown in fig. 1-3, the pile structure of the high-low pile cap type according to the embodiment includes a first pile cap plate 2 which is transversely disposed, at least a portion of the first pile cap plate 2 extends into a filling roadbed 5, the top of the first pile cap plate 2 is connected with an upper pile foundation 1, the bottom of the first pile cap plate 2 is connected with a lower pile foundation 4, a second pile cap plate 3 is disposed on the upper pile foundation 1, at least a portion of the second pile cap plate 3 extends into the filling roadbed 5, the second pile cap plate 3 and the first pile cap plate 2 are disposed at intervals along the length direction of the upper pile foundation 1, and the lower pile foundation 4 is a reinforced concrete bored pile.
As shown in fig. 1 and 2, there may be one or at least two second bearing plates 3, when there are at least two second bearing plates 3, at least two second bearing plates 3 are disposed adjacent to each other at intervals along the length direction of the upper pile foundation 1, and at least two second bearing plates 3 are disposed adjacent to each other at intervals along the length direction of the upper pile foundation 1, so as to optimize the stress form of the upper pile foundation 1 in sections and further reduce the pile foundation internal force.
Specifically, the upper pile foundation 1 and the first platform plate 2 are connected through steel bars, and/or the lower pile foundation 4 and the first platform plate 2 are connected through steel bars. So that the connection is firmer.
The upper pile foundation 1 and the lower pile foundation 4 are arranged in a one-to-one correspondence mode, eccentric bending moment loads borne by the first bearing plate 2 are reduced, in the actual construction process, the upper pile foundation 1 penetrates through the first bearing plate 2 and then is connected with the corresponding lower pile foundation 4, and the upper pile foundation 1 and the corresponding lower pile foundation 4 are integrally cast and formed structural members, so that the whole structural stability is better.
In particular, the transverse width L of the first deck plate 21Is [2m, 4m ]](ii) a The transverse width L of the second bearing plate 32Is [1m, 2m ]]。
The utility model provides a high low pile cap formula pile structure, 2 bottoms of first pile cap board are connected with lower part pile foundation 4, when using, lower part pile foundation 4 stretches into ground 6, support as the basis of high low pile cap formula pile structure, at least partly of first pile cap board 2 stretches into in the fill road bed 5 to make fill road bed 5 be located the fill soil body of first pile cap board 2 top act on a downward vertical force of first pile cap board 2, with this to upper portion pile foundation 1 produce the negative-going moment of a trend line side, offset some fill road bed 5 apply with the positive moment of upper portion pile foundation 1 production of lateral soil pressure of upper portion pile foundation 1, the pile bolck displacement of effective control upper portion pile foundation 1, thereby reduced the internal force of upper portion pile foundation 1, long and the pile footpath.
And at least one part of the second bearing plate 3 extends into the filling roadbed 5, so that the filling soil body of the filling roadbed 5 positioned above the second bearing plate 3 acts on the second bearing plate 3 to generate a downward vertical force to the upper pile foundation 1, thereby generating a negative bending moment inclined to the line side, furthermore, the second bearing plate 3 is arranged, the second bearing plate 3 and the first bearing plate 2 are arranged at intervals, so that the stress of the part of the upper pile foundation 1 positioned on the first bearing plate 2 and the second bearing plate 3 is changed from a cantilever type into a two-end type or a lower-end type, and the stress type of the upper-end axial limit of the lower-end type or the upper-end axial limit of the upper-end type is mainly determined by the depth of the second bearing plate 3 extending into the filling roadbed 5. Therefore, the stress form of the upper pile foundation 1 is greatly optimized, and the second bearing plate 3 can also reduce the soil pressure of the filling roadbed 5 applied to the pile side between the second bearing plate 3 and the first bearing plate 2, thereby reducing the internal force of the pile foundation.
Meanwhile, the arrangement of the first bearing plate 2 and the second bearing plate 3 enables the bending moment borne by the upper pile foundation 1 and the lower pile foundation 4 to be distributed uniformly, and the pile length and the pile diameter are further reduced.
The beneficial effects of this embodiment: the application a high low bearing platform formula pile structure, through setting up first bearing platform board 2 and second bearing platform board 3, not only can offset some fill road bed 5 apply with the forward bending moment of upper portion pile foundation 1 production of side direction soil pressure of upper portion pile foundation 1, optimize the atress form of the part that upper portion pile foundation 1 is located first bearing platform board 2 and second bearing platform board 3 moreover, reduce fill road bed 5 and apply second bearing platform board 3 with the soil pressure of pile side between the first bearing platform board 2 to reduce the pile foundation internal force, thereby reduce the pile length and the pile diameter of upper portion pile foundation 1 greatly, and then reduce construction cost.
Example 2
As shown in fig. 1 and 3, in the pile foundation of the high-low pile cap structure according to this embodiment, the pile foundation includes an upper pile foundation 1 and a lower pile foundation 4, the upper pile foundation 1 may be a round pile or a square pile, the lower pile foundation 4 is a reinforced concrete bored pile, and the lower pile foundations 4 are longitudinally arranged in a foundation 6 at intervals; the first pile cap plate 2 is arranged near the junction of the pile foundation and the ground and is longitudinally arranged at equal intervals with the pile foundation, and the pile foundation is firmly connected with the first pile cap plate 2 through a steel bar; the second pile cap plate 3 is provided on the pile foundation.
As shown in fig. 1-4, the filling soil body above the high first bearing plate behind the pile acts on the first bearing plate 2 and the second bearing plate 3 respectively to generate a downward vertical force to the pile foundation, so as to generate a negative bending moment tending to the line side, offset the positive bending moment generated by the soil pressure to the pile foundation, effectively control the displacement of the pile top, enable the bending moment of the pile foundation to be distributed uniformly, further reduce the length and diameter of the pile, and the width of the first bearing plate is generally 2-4 m.
The second bearing plate 3 can reduce the soil pressure applied to the pile side between the high bearing plate and the low bearing plate by filling soil, the internal force of a pile foundation is greatly reduced, and the width of the second bearing plate is generally 1-2 m.
When the pile foundation is deformed under the soil pressure, the first bearing plate 2 arranged in front of the pile acts on the foundation 6, the foundation 6 can provide a reverse supporting force, the lateral extrusion of the pile foundation anchoring section to the foundation soil can be effectively reduced, and the pile length can be further reduced.
The beneficial effects of this embodiment:
(1) arranging a high first bearing plate on the pile body, and utilizing a downward vertical force acted on the bearing plate by the filled soil body above the bearing plate behind the pile to generate a negative bending moment inclined to a line side for the pile foundation and offset a positive bending moment generated by soil pressure on the pile foundation; meanwhile, the reverse supporting force of the foundation to the first bearing plate in front of the pile is utilized, the lateral extrusion of the pile foundation anchoring section to foundation soil can be effectively reduced, the displacement of the pile top is effectively controlled, the bending moment of the pile foundation can be uniformly distributed, and the length and the diameter of the pile are further reduced.
(2) The second bearing plate arranged on the upper portion of the pile can effectively reduce soil pressure applied to the pile side between the high bearing platform and the low bearing platform by filling soil, and internal force of the pile foundation is greatly reduced.
(3) The pile structure solves the technical problems that the pile top displacement control is difficult and the pile spacing is too small due to large soil pressure after filling high piles in the traditional lateral constraint pile structure, and has the characteristics of novel structure, safety, reliability, convenience in construction, investment saving and the like, and the application prospect is wide.
Example 3
As shown in fig. 4, the pile foundation system according to this embodiment includes the high-low pile cap structure according to embodiment 1 or 2, and the first pile cap plate 2 is located at an interface between the foundation 6 and the fill subgrade 5.
The application a pile foundation system, first bearing board 2 be located ground 6 with fill road bed 5's juncture, first bearing board 2 acts on ground 6, and ground 6 can provide a reverse bearing power, can effectively reduce the pile foundation anchor section of lower part pile foundation 4 and to the side direction extrusion of foundation soil, can reduce the pile length of lower part pile foundation 4 greatly.
Meanwhile, the pile foundation system comprises the high-low pile bearing platform type pile structure, when the high-low pile bearing platform type pile structure is used, the lower pile foundation 4 extends into the foundation 6 to serve as a foundation support of the high-low pile bearing platform type pile structure, at least one part of the first pile bearing platform plate 2 extends into the filling roadbed 5, so that the filling soil body located above the first pile bearing platform plate 5 acts on the first pile bearing platform plate 2 to exert a downward vertical force, a negative bending moment inclined to the line side is generated on the upper pile foundation 1, a positive bending moment generated by the lateral soil pressure of the upper pile foundation 1 and applied to the upper pile foundation 1 by the filling roadbed 5 is offset, the pile top pile foundation displacement of the upper pile foundation 1 is effectively controlled, and the internal force, the pile length and the pile diameter of the upper pile foundation 1 are reduced.
And at least one part of the second bearing plate 3 extends into the filling roadbed 5, so that the filling soil body of the filling roadbed 5 positioned above the second bearing plate 3 acts on the second bearing plate 3 to generate a downward vertical force to the upper pile foundation 1, thereby generating a negative bending moment inclined to the line side, furthermore, the second bearing plate 3 is arranged, the second bearing plate 3 and the first bearing plate 2 are arranged at intervals, so that the stress of the part of the upper pile foundation 1 positioned on the first bearing plate 2 and the second bearing plate 3 is changed from a cantilever type into a two-end type or a lower-end type, and the stress type of the upper-end axial limit of the lower-end type or the upper-end axial limit of the upper-end type is mainly determined by the depth of the second bearing plate 3 extending into the filling roadbed 5. Therefore, the stress form of the upper pile foundation 1 is greatly optimized, and the second bearing plate 3 can also reduce the soil pressure of the filling roadbed 5 applied to the pile side between the second bearing plate 3 and the first bearing plate 2, thereby reducing the internal force of the pile foundation.
And the arrangement of the first bearing plate 2 and the second bearing plate 3 ensures that the bending moment borne by the upper pile foundation 1 and the lower pile foundation 4 is uniformly distributed, and the pile length and the pile diameter are further reduced.
To sum up, this application a pile foundation system, through setting up first pile cap board 2 and second pile cap board 3, first pile cap board 2 be located the ground 6 with fill the juncture of road bed 5 to reduce the pile foundation internal force of upper portion pile foundation 1 and lower part pile foundation 4, thereby reduce the pile length and the pile diameter of upper portion pile foundation 1 and lower part pile foundation 4 greatly, and then reduce construction cost.
In the construction process, the upper part of the high-low bearing platform type pile structure according to embodiment 1 or 2 is buried in the fill subgrade 5.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a high low pile cap formula pile structure, its characterized in that, including horizontal first pile cap board (2) that sets up, at least partly stretch into fill road bed (5) of first pile cap board (2), first pile cap board (2) top is connected with upper portion pile foundation (1), first pile cap board (2) bottom is connected with lower part pile foundation (4), be provided with second pile cap board (3) on upper portion pile foundation (1), at least partly stretch into fill road bed (5) of second pile cap board (3), second pile cap board (3) with first pile cap board (2) are followed the length direction interval of upper portion pile foundation (1) sets up.
2. A high-low pile cap structure according to claim 1, wherein the number of the second pile cap plates (3) is at least two, and the adjacent second pile cap plates (3) are arranged at intervals along the length direction of the upper pile foundation (1).
3. A high-low pile cap structure according to claim 1, wherein the upper pile (1) is connected to the first pile cap (2) by steel reinforcement and/or the lower pile (4) is connected to the first pile cap (2) by steel reinforcement.
4. A high-low pile cap structure according to claim 1, wherein the upper pile (1) and the lower pile (4) are arranged correspondingly.
5. A high-low pile cap structure according to claim 4, characterized in that the upper pile foundation (1) penetrates the first pile cap plate (2) and then is connected with the corresponding lower pile foundation (4), and the upper pile foundation (1) and the corresponding lower pile foundation (4) are integrally cast structural members.
6. A high-low pile structure according to any one of claims 1-5, wherein the first pile platform (2) has a transverse width L1Is [2m, 4m ]]。
7. A high-low pile structure according to any one of claims 1-5, wherein the second deck plate (3) has a transverse width L2Is [1m, 2m ]]。
8. A high-low bearing platform type pile structure according to any one of claims 1-5, characterized in that the lower pile foundation (4) is a reinforced concrete bored pile.
9. Pile foundation system, comprising a high-low bearing platform pile structure according to any of claims 1-8, wherein the first bearing platform (2) is located at the interface of the foundation (6) and the fill foundation (5).
10. A pile foundation system according to claim 9, wherein the upper part of the high-low bearing platform type pile structure is buried in the fill subgrade (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021229862.9U CN212561591U (en) | 2020-06-29 | 2020-06-29 | High-low bearing platform type pile structure and pile foundation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021229862.9U CN212561591U (en) | 2020-06-29 | 2020-06-29 | High-low bearing platform type pile structure and pile foundation system |
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| CN212561591U true CN212561591U (en) | 2021-02-19 |
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