CN212270915U - Steel pipe composite rock-socketed pile foundation structure - Google Patents
Steel pipe composite rock-socketed pile foundation structure Download PDFInfo
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- CN212270915U CN212270915U CN202020925985.XU CN202020925985U CN212270915U CN 212270915 U CN212270915 U CN 212270915U CN 202020925985 U CN202020925985 U CN 202020925985U CN 212270915 U CN212270915 U CN 212270915U
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Abstract
The utility model relates to the technical field of pile foundation construction, in particular to a steel pipe composite rock-socketed pile foundation structure; the adopted technical scheme is as follows: a steel pipe composite rock-socketed pile foundation structure comprises a pile foundation body used for filling a pile foundation hole, wherein the pile foundation body comprises an end support structure body and a friction structure body which are fixedly connected; the end support structure is used for filling bedrock, and the friction structure is used for filling soil; the friction structure body is provided with a pile hole and a plurality of planting rods, and the pile hole is used for accommodating and fixing the pile body; the planting rods are distributed along the radial direction of the friction structure body and can move along the radial direction of the friction structure body, the inner ends of the planting rods are arranged in the installing holes, and the inner ends of the planting rods are extruded when the pile bodies are inserted into the pile holes so that the outer ends of the planting rods are inserted into the covering soil. The utility model discloses can shorten pile foundation hole degree of depth by a wide margin to reduce the construction degree of difficulty of socketed pile and shorten construction cycle.
Description
Technical Field
The utility model relates to a pile foundation construction technical field, concretely relates to compound rock-socketed pile foundation structure of steel pipe.
Background
The socketed pile is a bored pile with a certain length at the lower part of the pile poured in a hard rock stratum, and the steel pipe composite socketed pile is a foundation pile with a concrete or reinforced concrete poured in a steel pipe. Specifically, the lower end of the rock-socketed pile is embedded into a pile of moderately weathered, slightly weathered or fresh bedrock, and the standard value of the axial ultimate bearing capacity of the rock-socketed pile consists of three parts, namely a total side resistance of soil around the pile, a total side resistance of a rock-socketed section and a total end resistance, and decreases progressively with depth. Research shows that the strength of the soil layer on the side of the rock-socketed pile influences the slope of an axial force distribution curve and the load ratio of the share of the resistance on the side of the pile increases along with the increase of the length-diameter ratio and increases along with the increase of the strength of the rock-socketed cover layer. Therefore, in order to ensure the load and the shearing resistance of the rock-socketed pile, a deeper pile foundation hole is usually drilled in a rock mass, so that the construction difficulty is high, the construction cost is high, the construction period is long, and the construction progress of the whole engineering is influenced.
SUMMERY OF THE UTILITY MODEL
To the big technical problem with the construction cycle length of the current rock-socketed pile construction degree of difficulty of the aforesaid, the utility model provides a steel pipe composite rock-socketed pile foundation structure can transmit the most load of rock-socketed pile for covering soil layer to shorten the pile foundation hole degree of depth on the bedrock by a wide margin, thereby reduce the construction degree of difficulty of rock-socketed pile and shorten construction cycle.
The utility model discloses a following technical scheme realizes:
a steel pipe composite rock-socketed pile foundation structure comprises a pile foundation body used for filling a pile foundation hole, wherein the pile foundation body comprises an end support structure body and a friction structure body which are fixedly connected; the end support structure is used for filling bedrock, and the friction structure is used for filling soil; the friction structure body is provided with a pile hole and a plurality of planting rods, and the pile hole is used for accommodating and fixing the pile body; the planting rods are distributed along the radial direction of the friction structure body and can move along the radial direction of the friction structure body, the inner ends of the planting rods are arranged in the installing holes, and the inner ends of the planting rods are extruded when the pile bodies are inserted into the pile holes so that the outer ends of the planting rods are inserted into the covering soil.
The utility model discloses when building and establishing the socketed pile basis, build in the pile foundation hole of basement rock and establish the end bearing structure body, for the pile body provides the end and hinders then to transmit the load of pile body for the rock mass for the basement rock through the end bearing structure body dispersion, prevent that the load that the pile body bore from destroying the basement rock. The upper end of the end support structure is fixedly connected with a friction structure, the outer end of the planting rod arranged in the radial direction of the friction structure is inserted into the soil covering through the gravity of the pile body and the impact force during piling when the pile body is inserted into the pile hole of the friction structure, and the inner end of the planting rod is left in the gap between the pile body and the wall of the pile hole; and simultaneously, grouting the gap between the pile hole and the pile body, so that the friction structure body, the end support structure body and the pile body are fixedly connected into a whole.
Therefore the utility model discloses can increase the total side resistance of soil all around the stake greatly and prevent that the pile body from destroying the basement rock to give earthing and basement rock with pile body load transfer, and then reduce the total side resistance of rock-socketed section. That is to say the utility model discloses only need bore on the bed rock get can hold the hole of end support structure body, and the hole on the bed rock only provides the end support power and need not provide frictional force or only need provide less frictional force, and the hole depth degree of getting that consequently bores on the bed rock is little, has shortened the pile foundation hole degree of depth on the bed rock by a wide margin to the construction degree of difficulty of the socketed pile has been reduced and construction cycle has been shortened.
Preferably, the planting rods are uniformly distributed along the circumferential direction of the friction structure body so as to ensure that the friction structure body is uniformly stressed and prevent the rock-socketed pile from overturning.
Preferably, the planting rod is provided with a plurality of layers at intervals along the length direction of the friction structure body so as to further increase the total lateral resistance of soil around the pile, further improve the loading capacity of the rock-socketed pile and/or shorten the depth of a pile foundation hole.
Preferably, the end part of the inner end of the planting rod is provided with a downward inclined plane, and the lower end of the corresponding pile body is in an inverted round table shape so as to reduce the resistance of the pile body inserted into the pile hole and provide guidance for the pile body inserted into the pile hole.
As a specific embodiment of the implant rod, the implant rod is a triangular prism to ensure sufficient rigidity and strength of the implant rod.
Preferably, the widest side of the planting rod faces the end structure body, so that the supporting force provided by the covering soil to the friction structure body is increased, and the total lateral resistance of the soil around the pile is further increased.
Preferably, the upper end of the end bearing structure body is provided with a conical pit, and the pit is used for accommodating the bottom end of the pile body so as to increase the contact surface between the end bearing structure body and the bottom end of the pile body and prevent the end bearing structure body from being damaged due to overlarge local stress.
As a specific implementation mode for connecting the end bearing structure body and the friction structure body, the upper end of the end bearing structure body is also provided with a plurality of connecting ribs which are uniformly distributed along the circumferential direction of the end bearing structure body; the lower end of the friction structure body is provided with a connecting hole, the connecting rib is inserted into the connecting hole, and a gap between the connecting rib and the connecting hole is filled with a grouting body, so that the friction structure body can be prefabricated, and the construction efficiency of the rock-socketed pile is further improved.
As a specific embodiment of the end support structure, the end support structure is a reinforced concrete structure poured at the bottom of the pile foundation hole to ensure that the end support structure has sufficient strength and can also ensure that the end support structure and the bedrock form a whole to further disperse the load of the end support structure.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. end bearing structure bodies are built in pile foundation holes of bedrock to provide end resistance for the pile bodies so that loads of the pile bodies to rock bodies are dispersedly transmitted to the bedrock through the end bearing structure bodies, and the load borne by the pile bodies is prevented from damaging the bedrock
2. The upper end of the end support structure body is fixedly connected with a friction structure body, when the pile body is inserted into the pile hole of the friction structure body, the outer end of the planting rod arranged in the radial direction of the friction structure body is inserted into the soil covering through the gravity of the pile body and the impact force during piling, and the inner end of the planting rod is left in the gap between the pile body and the wall of the pile hole; and simultaneously, grouting the gap between the pile hole and the pile body, so that the friction structure body, the end support structure body and the pile body are fixedly connected into a whole. The total lateral resistance of soil around the pile can be greatly increased, the pile body is prevented from damaging bedrock, the load of the pile body is transmitted to the covering soil and the bedrock, the total lateral resistance of the rock-socketed section is further reduced, the depth of a pile foundation hole in the bedrock is greatly shortened, and the construction difficulty of the rock-socketed pile is reduced and the construction period is shortened.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of an end support structure of the present invention;
fig. 3 is a schematic diagram of the friction member of the present invention.
Reference numbers and corresponding part names in the drawings:
1-pile foundation hole, 2-pile base body, 3-end support structure body, 4-friction structure body, 5-bedrock, 6-earthing, 7-pile hole, 8-planting rod, 9-pile body, 10-pit, 11-connecting rib, 12-connecting hole and 13-grouting body.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Examples
The utility model provides a compound rock-socketed pile foundation structure of steel pipe, is including the pile foundation body 2 that is used for filling out pile foundation hole 1, can understand that, 1 bottom in pile foundation hole sets up in basement rock 5, 1 upper end in pile foundation hole sets up in the earthing. The pile base body 2 comprises an end support structure body 3 and a friction structure body 4 which are fixedly connected, the end support structure body 3 is arranged in bedrock 5, and the friction structure body 4 is arranged in covering soil 6; namely, the end support body 3 is used for filling bedrock 5, and the friction body 4 is used for filling soil 6. The friction structure body 4 is provided with a pile hole 7 and a plurality of planting rods 8, and the pile hole 7 is used for accommodating and fixing a pile body 9; plant pole 8 and radially distribute and can follow friction structure 4 and radially move along friction structure 4, plant pole 8 inner and set up in the dress hole, extrude when pile body 9 inserts stake hole 7 and plant 8 inner and make and plant 8 outer ends of pole and insert in earthing 6.
When the socketed pile foundation is built, the end bearing structure body 3 is built in the pile foundation hole 1 of the bedrock 5 so as to provide end resistance for the pile body 9 and then transmit the load of the pile body 9 to the rock mass to the bedrock 5 through the end bearing structure body 3 in a dispersing way, and the load borne by the pile body 9 is prevented from damaging the bedrock 5. Moreover, the upper end of the end support structure body 3 is fixedly connected with a friction structure body 4, and when a pile body 9 of a planting rod 8 arranged in the radial direction of the friction structure body 4 is inserted into a pile hole 7 of the friction structure body 4, the outer end of the planting rod 8 is inserted into the soil covering 6 through the gravity of the pile body 9 and the impact force during pile driving, and the inner end of the planting rod 8 is left in a gap between the pile body 9 and the wall of the pile hole 7; and simultaneously, grouting the gap between the pile hole 7 and the pile body 9, thereby fixedly connecting the friction structure 4, the end support structure 3 and the pile body 9 into a whole.
Therefore, the total lateral resistance of the soil around the pile can be greatly increased, the pile body 9 is prevented from damaging the bedrock 5, the load of the pile body 9 is transmitted to the covering soil 6 and the bedrock 5, and the total lateral resistance of the rock-socketed section is further reduced. That is to say this embodiment only need bore on basement rock 5 get can hold end support structure body 3 the hole, and the hole on basement rock 5 only provides the end bearing power and need not provide frictional force or only need provide less frictional force, and consequently the hole depth of boring on basement rock 5 is little, has shortened 1 degree of depth of pile foundation hole on basement rock 5 by a wide margin to the construction degree of difficulty that has reduced the socketed pile and has shortened construction cycle.
Preferably, the planting rods 8 are uniformly distributed along the circumferential direction of the friction structure 4 to ensure that the friction structure 4 is uniformly stressed and prevent the rock-socketed pile from overturning. According to the length of the friction structure body 4, a plurality of layers of planting rods 8 can be arranged in the length direction of the friction structure body 4, namely the planting rods 8 are arranged on a plurality of layers at intervals in the length direction of the friction structure body 4 so as to further increase the total lateral resistance of soil around the pile and further improve the loading capacity of the rock-socketed pile and/or shorten the depth of the pile foundation hole 1.
Preferably, the end part of the inner end of the planting rod 8 is provided with a downward inclined plane, and the lower end of the corresponding pile body 9 is in an inverted round table shape. It should be understood that the inclined plane at the inner end of the planting bar 8 is formed into a shape matched with the circular truncated cone shape at the lower end of the pile body 9, so as to reduce the resistance of the pile body 9 inserted into the pile hole 7 and provide guidance for inserting the pile body 9 into the pile hole 7.
As a specific embodiment of the implant 8, the implant 8 is a triangular prism to ensure sufficient rigidity and strength of the implant 8. Preferably, the widest side of the planting rod 8 is opposite to the end structure body, so that the supporting force provided by the covering soil 6 to the friction structure body 4 is increased, and the total side resistance of the soil around the pile is further increased.
As a specific implementation mode for connecting the end support structure body 3 and the friction structure body 4, the upper end of the end support structure body 3 is further provided with a plurality of connecting ribs 11, and the connecting ribs 11 are uniformly distributed along the circumferential direction of the end support structure body 3; the lower end of the friction structure body 4 is provided with a connecting hole 12, the connecting rib 11 is inserted into the connecting hole 12, and a gap between the connecting rib 11 and the connecting hole 12 is filled with grouting body 13, so that the friction structure body 4 can be prefabricated, and the construction efficiency of the rock-socketed pile is further improved.
As a specific embodiment of the end support structure 3, the end support structure 3 is a reinforced concrete structure cast at the bottom of the pile foundation hole 1 to ensure sufficient strength of the end support structure 3 and ensure that the end support structure 3 and the bedrock 5 are integrated to further disperse the load of the end support structure 3.
Preferably, the upper end of the end support structure body 3 is provided with a conical pit 10, and the pit 10 is used for accommodating the bottom end of the pile body 9 so as to increase the contact surface between the end support structure body 3 and the bottom end of the pile body 9 and prevent the end support structure body 3 from being damaged due to excessive local stress.
The building method of the embodiment comprises the following steps:
drilling a pile foundation hole 1 at a pile embedding station through punching equipment according to a construction drawing, wherein the depth of the pile foundation hole 1 on a bed rock 5 is determined according to the characteristics of a rock-soil structure of a construction site;
after punching is finished, hoisting a reinforcement cage of the end support body into the bottom of the pile foundation hole 1, and pouring concrete so as to pour the end support body 3 in the pile foundation hole 1 in the bedrock 5;
prefabricating the friction structure 4 according to a design drawing of the friction structure 4, and transporting the friction structure 4 to a construction site after the maintenance of the friction structure 4 is finished;
after the end bearing structure body 3 is solidified, the friction structure body 4 is hoisted on the end bearing structure body 3, so that the connecting ribs 11 are inserted into the connecting holes 12, then the pile body 9 is arranged in the pile hole 7, and the planting rod 8 is inserted into the soil through the gravity of the pile body 9;
and then, grouting the gap between the pile hole 7 and the pile body 9, and filling the gap between the connecting rib 11 and the connecting hole 12, the gap between the end support structure body 3 and the friction structure body 4, the gap between the pile foundation body 2 and the pile foundation hole 1 and the gap between the pile hole 7 and the pile body 9 with concrete slurry, so that the friction structure body 4, the end support structure body 3 and the pile body 9 are fixedly connected into a whole, and the construction of the steel pipe composite rock-socketed pile foundation is completed.
It should be noted that, in order to make the planting rod 8 have a sufficient length, a section of the pile foundation hole 1 located in the soil may be reamed, and the gap between the pile base 2 and the pile foundation hole 1 may be backfilled after the pile body 9 is stabilized.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. The steel pipe composite rock-socketed pile foundation structure is characterized by comprising a pile foundation body (2) for filling a pile foundation hole (1), wherein the pile foundation body (2) comprises an end support structure body (3) and a friction structure body (4) which are fixedly connected;
the end support structure body (3) is used for filling bedrock (5), and the friction structure body (4) is used for filling earthing soil (6);
the friction structure body (4) is provided with a pile hole (7) and a plurality of planting rods (8), and the pile hole (7) is used for accommodating and fixing a pile body (9);
plant pole (8) and follow friction structure body (4) radial distribution and can follow friction structure body (4) radial movement, plant pole (8) inner and set up in the dress hole, extrude when pile body (9) insert stake hole (7) and plant pole (8) inner and make and plant pole (8) outer end and insert in earthing (6).
2. The steel pipe composite socketed pile foundation structure according to claim 1, characterized in that the planting bars (8) are evenly distributed along the circumference of the friction member (4).
3. The steel pipe composite socketed pile foundation structure according to claim 2, characterized in that the planting bars (8) are provided with a plurality of layers at intervals along the length direction of the friction structure (4).
4. The steel pipe composite socketed pile foundation structure according to any one of claims 1 to 3, wherein the end of the inner end of the planting bar (8) is provided with a downward inclined plane.
5. The steel pipe composite rock-socketed pile substructure according to any of claims 1 to 3, characterized in that the planting bars (8) are triangular prisms.
6. The steel pipe composite socketed pile substructure according to claim 5, characterized in that the widest side of the planting bars (8) faces the end structure.
7. The steel pipe composite socketed pile substructure as claimed in claim 1, characterized in that the upper end of the end support structure body (3) is provided with a conical recess (10), said recess (10) being adapted to receive the bottom end of the pile body (9).
8. The steel pipe composite rock-socketed pile foundation structure according to claim 1, characterized in that a plurality of connecting ribs (11) are further arranged at the upper end of the end support structure body (3), and the connecting ribs (11) are uniformly distributed along the circumferential direction of the end support structure body (3);
the friction structure is characterized in that a connecting hole (12) is formed in the lower end of the friction structure body (4), the connecting rib (11) is inserted into the connecting hole (12), and a gap between the connecting rib (11) and the connecting hole (12) is filled with grouting body (13).
9. The steel pipe composite socketed pile substructure according to claim 1, characterized in that the end support structure (3) is a reinforced concrete structure cast at the bottom of the pile foundation hole (1).
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| CN202020925985.XU CN212270915U (en) | 2020-05-27 | 2020-05-27 | Steel pipe composite rock-socketed pile foundation structure |
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| CN202020925985.XU CN212270915U (en) | 2020-05-27 | 2020-05-27 | Steel pipe composite rock-socketed pile foundation structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455985A (en) * | 2020-05-27 | 2020-07-28 | 中信国安建工集团有限公司 | Steel pipe composite rock-socketed pile foundation structure and building method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111455985A (en) * | 2020-05-27 | 2020-07-28 | 中信国安建工集团有限公司 | Steel pipe composite rock-socketed pile foundation structure and building method |
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