CN216515536U - Pretensioning prestressed concrete rectangular solid supporting pile - Google Patents
Pretensioning prestressed concrete rectangular solid supporting pile Download PDFInfo
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- CN216515536U CN216515536U CN202121547813.4U CN202121547813U CN216515536U CN 216515536 U CN216515536 U CN 216515536U CN 202121547813 U CN202121547813 U CN 202121547813U CN 216515536 U CN216515536 U CN 216515536U
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Abstract
The utility model discloses a pretensioning prestressed concrete rectangular solid supporting pile which comprises a pile body, prestressed tendons, stirrups and connecting components. Through the design of the prestressed reinforcing steel bars parallel to the side surfaces of the strong shaft and the weak shaft of the pile body, the bending resistance and the shearing resistance of the pile body are improved, the use of redundant reinforcing steel bars is reduced, and the optimal performance is integrally achieved. The cross section of the pile body is of a rectangular solid structure, so that the bending resistance and the shearing resistance of a single support pile are improved; the prestressed tendons apply pre-compressive stress to the pile body to resist tensile deformation generated when the supporting pile bears shearing force, so that the bending resistance and the shearing resistance of the supporting pile are further improved; the connecting assembly improves the bending resistance and the shearing resistance of the connection position of the support pile; meanwhile, the width of the support pile in the soil facing direction is smaller than that of the support pile perpendicular to the soil facing direction, so that the pile using amount is reduced under the condition of ensuring the protection safety; and the pile body of the rectangular section structure can enable adjacent supporting piles to be tightly attached, so that the integral shear resistance of the supporting wall formed by the supporting piles is improved.
Description
Technical Field
The utility model relates to the technical field of pipe piles, in particular to a pretensioning prestressed concrete rectangular solid supporting pile.
Background
A fender pile is a pile that primarily bears lateral thrust. The method is generally used for foundation pit support, side slope support and landslide control, and bears horizontal soil pressure or landslide thrust. Compared with the foundation pile which generally bears vertical force, the supporting pile has extremely high requirements on bending resistance and shearing resistance in the horizontal direction.
In the prior art, in order to further reduce the material cost of the precast concrete support pile, a prestressed hollow pipe pile is mostly adopted, and the pipe pile can cause insufficient bending resistance and shearing resistance of the support pile and is difficult to be suitable for a foundation pit with large landslide risk; meanwhile, in order to ensure that the support pile has enough bending resistance and shearing resistance, the existing tubular pile is provided with redundant design on reinforcing steel bars, so that the reinforcing steel bars are wasted.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the related art, the utility model provides a pretensioning prestressed concrete rectangular solid support pile to overcome the technical problems in the prior related art.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a pretensioned prestressed concrete rectangular solid support pile, comprising:
the pile body is prefabricated and formed by concrete, and the cross section of the pile body is of a rectangular solid structure;
the prestressed tendons are embedded in the pile body along the length direction of the pile body, and are distributed along the profile of the cross section of the pile body;
the hoop reinforcement is sequentially wound around the prestressed reinforcement and fixed with the prestressed reinforcement;
the connecting assembly is at least arranged at one end of the pile body and used for connecting the support pile and applying pre-tensioning stress to the prestressed reinforcing steel bars;
the width of the side surface vertical to the strong axis direction is larger than that of the side surface vertical to the weak axis direction;
in the direction parallel to the strong axis, the distance between the prestressed tendons is 65-125 mm;
the spacing of the prestressed tendons is 130-205mm in the direction parallel to the weak axis.
In a further embodiment of the method of the utility model,
the number of the prestressed tendons on the two side surfaces parallel to the strong axis direction is greater than or equal to that on the two side surfaces parallel to the weak axis direction;
the distance between the prestressed tendons and the outer side face of the pile body is larger than or equal to 40 mm.
By adopting the technical scheme: the bending resistance and the shearing resistance of the support pile in the strong axis direction are improved, so that the protection capability of the support pile in the soil facing direction is improved; meanwhile, the width in the direction of the weak axis is prolonged, so that the pile using amount of the foundation pit can be reduced.
In a further embodiment, the distances from the axis of the tendon to the adjacent sides of the shaft are substantially equal.
By adopting the technical scheme: when the supporting pile receives transverse shearing force, the prestressed tendons keep balanced deformation, and cracking of the supporting pile caused by overlarge local deformation is avoided.
In a further embodiment, the stirrup is spirally wound around the tendon.
By adopting the technical scheme: the stirrup that the spiral set up has the ability of kick-backing when receiving horizontal effort emergence bending deformation to make the stirrup also can promote the bending resistance and the shear behavior of a fender pile.
In a further embodiment, the diameter of the stirrup is greater than or equal to 5 mm.
In a further embodiment, the connection assembly comprises:
and the end plate is provided with anchor holes corresponding to the prestressed tendons one by one and a plurality of bolt holes.
By adopting the technical scheme: prestress is applied to the prestressed tendons through the anchor holes, the end plates are tightly matched with the pile body, and the bolt holes are used for supporting and connecting the pile.
In a further embodiment, the connection assembly further comprises:
the hoop is arranged at the connection end of the pile body in a surrounding mode.
By adopting the technical scheme: on one hand, the hoop protects the end part of the pile body so as to reduce collision damage and striking damage in the piling process; on the other hand, after two fender piles are plugged, the hoop can share the transverse shearing force on the pile body of the two fender piles, and the bending deformation degree of the fender piles at the connection position is reduced.
In a further embodiment, the anchor hole communicates with the bolt hole, and the bolt hole has an inner diameter larger than an inner diameter of the anchor hole.
In a further embodiment, one end of the shaft is formed with a taper.
By adopting the technical scheme: the conical part can reduce the resistance that the pile shaft got into earth when piling to promote pile efficiency.
In a further embodiment, at least one end of the shaft is further provided with a mechanical connecting member arranged to connect two shafts or to connect the upper end of a shaft to a cap.
By adopting the technical scheme: mechanical connecting part connects two pile bodies, improves the connection efficiency of a support pile, and then promotes the efficiency of construction of tubular pile.
In a further embodiment, the end plates are made of Q235B steel.
In a further embodiment, the concrete strength rating is greater than or equal to C60.
Has the advantages that: through the design of the prestressed tendons parallel to the side surfaces of the strong shaft and the weak shaft of the pile body, the bending resistance and the shearing resistance of the pile body are improved, the use of redundant steel bars is reduced, and the optimal performance is integrally achieved.
The cross section of the pile body is of a rectangular solid structure, so that the bending resistance and the shearing resistance of a single support pile are improved; the prestressed tendons apply pre-compressive stress to the pile body to resist tensile deformation generated when the supporting pile bears shearing force, so that the bending resistance and the shearing resistance of the supporting pile are further improved;
meanwhile, the number of the prestressed tendons arranged in the soil facing direction is greater than or equal to the number of the prestressed tendons perpendicular to the soil facing direction, so that the bending resistance and the shearing resistance of the support pile when bearing shearing force in the soil facing direction can be improved, and the structural arrangement that the width of the support pile in the soil facing direction is smaller than the width perpendicular to the soil facing direction can be realized, so that the reduction of pile using amount is facilitated under the condition of ensuring the protection safety;
in addition, the pile body with the rectangular cross section structure can enable adjacent supporting piles to be tightly attached, so that the integral shearing resistance of the supporting wall formed by the supporting piles is improved; in addition, the connecting assembly improves the bending resistance and the shearing resistance of the upper supporting pile and the lower supporting pile at the connection position.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a semi-sectional view of one embodiment of a pretensioned prestressed concrete rectangular solid fender pile.
Fig. 2 is a schematic view of another embodiment of a pretensioned prestressed concrete rectangular solid support pile.
Fig. 3 is a sectional view a-a in fig. 1.
Fig. 4 is a structural view of the end plate.
Fig. 5a is a partial view of an end plate.
Fig. 5B is a cross-sectional view B-B of fig. 5 a.
Fig. 5C is a cross-sectional view through C-C in fig. 5 a.
Fig. 6 is a partial view of the connection of the pre-stressed piles.
Fig. 7 is a structural schematic diagram of the mechanical coupling member.
Fig. 1 to 7 are marked at various points respectively as follows: the pile body 10, the connection end 11, the tapered part 12, the prestressed tendon 20, the stirrup 30, the connecting assembly 40, the end plate 41, the anchor hole 411, the bolt hole 412, the hoop 42, the mechanical connecting component 50, the first sleeve 51, the first annular convex part 511, the second sleeve 52, the second annular convex part 521, the first pier head gasket 53, the second pier head gasket 54, the clamp spring nut 55 and the tapered inserted rod 56.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
With the continuous improvement of the urbanization degree of China, medium and high-rise buildings are more and more, so that foundation pit engineering is more and more. The support pile is one of a plurality of methods for foundation pit maintenance, and is widely applied due to the advantages of short construction period and low construction cost.
The supporting pile mainly bears the pile of transverse thrust and mainly bears horizontal soil pressure or landslide thrust in practical application, so that the supporting pile has higher requirements on the bending resistance and the shearing resistance in the horizontal direction. In the prior art, in order to further reduce the material cost of the precast concrete support pile, a prestressed hollow pipe pile is mostly adopted, and the bending resistance and the shearing resistance of the support pile are insufficient due to the mode, so that the precast concrete support pile is difficult to be applied to a foundation pit with a large landslide risk.
As shown in fig. 1 to 7, the present invention provides a pretensioned prestressed concrete rectangular solid support pile, including: the pile body 10, the connection end 11, the tapered part 12, the prestressed rib 20, the stirrup 30, the connection assembly 40, the end plate 41, the anchor hole 411, the bolt hole 412, the hoop 42, the mechanical connection member 50, the first sleeve 51, the first annular convex part 511, the second sleeve 52, the second annular convex part 521, the first pier head gasket 53, the second pier head gasket 54, the clamp spring nut 55 and the tapered inserted rod 56.
Referring to fig. 1, the embodiment provides a pretensioned prestressed concrete rectangular solid support pile, which includes a pile body 10, prestressed tendons 20, stirrups 30, and connecting members 40.
Specifically, the pile body 10 is prefabricated and formed by concrete; and the cross section of the structure is a rectangular solid structure. The concrete strength grade of the pile body 10 is greater than or equal to C60, so that the pile body 10 is ensured to have higher compressive strength, and the pile body 10 can bear higher pressure along the length direction of the pile body 10; meanwhile, the pile body 10 can have high strength in the horizontal direction, so that the pile body 10 has high bending resistance and high shearing resistance. At least one end of shaft 10 forms a docking end 11. Namely, the corresponding end part is the connection end 11 when the two support piles are vertically butted. In general, in use, the support piles are divided into two types. One is required to be driven into the earth. With reference to fig. 2, the bottom end of the pile body 10 of the support pile is formed with a tapered portion 12, so that resistance to entering soil during pile driving can be reduced, and the purpose of improving pile driving efficiency can be achieved; and the top end is a connection end 11 for connecting the supporting pile at the upper part. The pile body 10 of another support pile is provided with connecting ends 11 at two ends, and the support pile is more applied under the condition of deeper foundation pit.
The prestressed tendons 20 are pre-embedded before the pile body 10 is prefabricated and formed, and then concrete is filled to form the pile body 10. When pre-embedding, the length direction of the prestressed tendon 20 should be consistent with the length direction of the formed pile body 10. And the prestressing force adopts the mode of pretensioning to stretch the reinforcing steel bars before the concrete is poured. Therefore, the prefabricated pile body 10 bears the compressive stress of the prestressed tendons 20 to resist the tensile deformation generated when the supporting pile bears the shearing force, and the bending resistance and the shearing resistance of the supporting pile are further improved.
Referring to fig. 3, the number of the prestressed tendons 20 is plural. Moreover, the prestressed tendons 20 are distributed along the profile of the cross section of the pile body 10, that is, the distribution path of the prestressed force also forms a rectangular structure. And the distribution mode of the prestressed reinforcing steel bars 20 can also meet the mirror symmetry, so that the structure of the supporting pile is also a mirror symmetry structure. Setting the direction vertical to two opposite side surfaces of the pile body 10 as the X direction; meanwhile, the direction perpendicular to the other two opposite side surfaces of the pile body 10 is set to be the Y direction. The X direction corresponds to the soil facing direction of the pile body 10, that is, the direction perpendicular to the side (soil facing surface) of the pile body 10 facing the lateral soil surface of the foundation pit is the soil facing direction (X direction, that is, the strong axis direction). And the Y direction is perpendicular to the soil-facing direction or is expressed as a direction parallel to the soil-facing surface, i.e., the weak axis direction.
In fig. 3, the left and right sides, i.e., the sides perpendicular to the strong axis or parallel to the weak axis, are the soil-facing sides. The upper and lower two side surfaces, namely the two side surfaces which are vertical to the weak axis or parallel to the strong axis, are non-soil-facing surfaces. The width of the side surface of the pile body in the direction vertical to the strong axis is larger than that of the side surface in the direction vertical to the weak axis. In addition, in the direction parallel to the strong axis, the distance between the prestressed tendons is 65-125 mm; in the direction parallel to the weak axis, the spacing of the prestressed tendons is 130-205 mm. Specifically, this example provides the following embodiments:
through the design to the prestressing tendons in strong axle and the weak axis direction, ensure that the quantity of prestressing tendons on the both sides face that is on a parallel with the strong axle direction is greater than or equal to the prestressing tendons quantity on the both sides face that is on a parallel with the weak axis direction, and the distance of prestressing tendons apart from pile body lateral surface is greater than or equal to 40mm, and then make under the circumstances that prestressing tendons quantity rationally sets up, ensure that solid fender pile can provide work efficiency, with the use that reduces redundant reinforcing bar, and then reduce the consumption of reinforcing bar.
The number of the distributed tendons 20 in the X direction is greater than or equal to the number of the distributed tendons in the Y direction. Based on this, the width of pile body 10 in the X direction is designed to be smaller than or equal to the width in the Y direction. On one hand, the distributed prestressed tendons 20 along the X direction can resist the shear force along the X direction more, so that the support pile has higher bending resistance and shear resistance along the X direction. In the Y direction, it is not necessary to bear the soil pressure or landslide thrust on the side of the foundation pit, and therefore, the pile body 10 can have a large width in the Y direction. The advantage of this kind of design is, when using the parallel formation of fender pile around with the inboard fender wall of foundation ditch, the fender pile can ensure to bear horizontal shearing force, and because the fender pile has great width in Y direction, consequently can greatly reduce the quantity of fender pile, and then realizes the reduction of cost.
In a further embodiment the distance of the axis of each tendon 20 to the adjacent side of shaft 10 is substantially equal. I.e. the axis of each tendon 20 is substantially equidistant from the closest side of shaft 10. The advantage that sets up here is that, when the lateral shear force was received to the fender pile, the prestressing tendons 20 in the same vertical plane of perpendicular to shear force can keep balanced deformation, avoids certain or local prestressing tendons 20 to bear great effort to the condition that the too big fender pile fracture that leads to of deformation appears.
The stirrup 30 is wound in sequence around all the tendons 20 and fixed thereto. In the prior art, a plurality of stirrups 30 uniformly arranged along the length direction of the tendon 20 are generally welded to the tendon 20. This may reduce the use of material for the stirrup 30 to some extent. In the present application, the stirrup 30 is spirally wound around the tendon 20 to improve the bending and shearing resistance of the support pile. The spiral shape of the stirrup 30 enables it to have a certain resilience in the horizontal direction compared to the prior art. This effect can be seen in reference to the spring which, when subjected to a force perpendicular to the axial direction, undergoes a bending deformation and, when this force is removed, is able to return to the vertical position again. This can be explained as the advantage of the helical winding of the stirrup 30 to the tendon 20 in this embodiment. That is, the pre-stressed tendons 20 can promote the improvement of the bending resistance and the shearing resistance of the support pile, and the stirrups 30 can promote the improvement of the bending resistance and the shearing resistance of the support pile alone. And the stirrup 30 rings in the prior art obviously do not have the effect of improving the bending resistance and the shearing resistance of the support pile. To ensure that the arrangement of the stirrup 30 provides greater bending and shearing resistance, the diameter of the stirrup 30 is set to be greater than or equal to 5 mm.
The connection assembly 40 includes an end plate 41. Referring to fig. 4, the end plate 41 also has a rectangular structure. And the end plate 41 is provided with a plurality of anchor holes 411 and a plurality of bolt holes 412 corresponding one-to-one to the tendons 20. Wherein, anchor eye 411 is the counter bore structure, and the setting of anchor eye 411 is in order to cooperate with prestressing tendons 20, and prestressing tendons 20 inserts anchor eye 411 and will be thick at the tip to make can exert prestressing force to prestressing tendons 20 through end plate 41. On the one hand, a tight fit of end plate 41 to shaft 10 is achieved. On the other hand, the prestressed tendons 20 after pretensioning generate a prestressing force on the pile body 10, so that when the support pile bends and deforms, the prestressed tendons 20 can offset part of the deformation. The bolt holes 412 are arranged to realize the connection of the support piles. The connection of two support piles can be achieved by providing bolts in the bolt holes 412. In order to ensure a certain strength of the end portion, the end plate 41 in this embodiment is made of Q235B steel.
In a further embodiment, in connection with fig. 5a, 5b and 5c, the anchor hole 411 is in communication with the bolt hole 412, and the inner diameter of the bolt hole 412 is larger than the inner diameter of the anchor hole 411. With this arrangement, it is possible to upset the end of the tendon 20 first, and then move the tendon 20 into the anchor hole 411 by moving the end plate 41 after inserting the bolt hole 412. Therefore, the prestressed reinforcing steel bars 20 can be assembled with the end parts after being manufactured in a standardized mode, and the prefabrication efficiency of the support piles is improved. Without the pre-stressing tendons 20 being inserted into the anchor holes 411 before upsetting the ends thereof.
In a further embodiment, the connection assembly 40 further comprises a ferrule 42 that is looped around the docking end 11 of shaft 10. The end of the pile body 10 can be wrapped and protected by the ferrule 42 to reduce the collision damage during hoisting and the striking damage during piling. Meanwhile, the hoop 42 is fixedly connected with the end plate 41, so that after the two support piles are plugged, the shearing force received at the plugging part is shared to the pile bodies 10 of the two support piles, the bending deformation degree of the support piles at the plugging part is reduced, and the supporting capacity of the support piles is improved.
In a further embodiment, in order to improve the efficiency of the site construction of the support pile, the efficiency of the alignment installation is improved by designing the mechanical connecting member 50 at the end of the pile body 10. In particular, at least one end of shaft 10 is provided with a mechanical connection element 50. Wherein the mechanical connecting part 50 comprises a number of first sleeves 51 and second sleeves 52 equal to the number of tendons 20. The first sleeve 51 is slightly longer than the second sleeve 52. The first sleeve 51 is pre-embedded in the pile body 10 of the upper support pile, the first sleeve 51 is coaxially sleeved on the tendon 20 of the upper support pile, and the top end inner wall of the first sleeve 51 protrudes towards the middle to form a first annular protrusion 511. The bottom upset end of the tendon 20 of the upper support pile is coaxially sleeved with a first pier head gasket 53, and the first pier head gasket 53 abuts against the first annular convex part 511. In addition, a first internal thread is formed at one end of the inner wall of the first sleeve 51 close to the bottom. The second sleeve 52 is pre-embedded in the pile body of the lower supporting pile. The second sleeve 52 is coaxially sleeved on the prestressed tendon 20 of the lower support pile, the bottom inner wall of the second sleeve 52 protrudes towards the middle to form a second annular convex portion 521, the top upset end of the prestressed tendon 20 of the lower support pile is coaxially sleeved with a second pier head gasket 54, and the second pier head gasket 54 abuts against the second annular convex portion 521. When the two support piles are mechanically connected, the tapered insertion rod 56 is screwed into the second sleeve 52 by screwing the circlip nut 55 into the first sleeve 51. Then, the upper and lower support piles correspond to each other, and the tapered insertion rod 56 is inserted into the snap spring nut 55 to complete the mechanical connection of the two support piles. By adopting the mode, the connection efficiency of the support piles can be greatly increased, and the construction progress of the support piles is promoted. But this connection is often unstable. Therefore, the ferrules 42 of the butted end portions of the upper and lower support piles are welded to improve the stability of the support pile connection. The quality rating of a particular ferrule 42 is three. Therefore, the connection stability of the support piles is improved by adopting a mode of mechanical connection and welding coincidence connection. In addition, the mechanical connecting component 50 can also be used for connecting the upper end of the pile body with the bearing platform.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A pretensioned prestressed concrete rectangular solid support pile, comprising:
the pile body is prefabricated and formed by concrete, and the cross section of the pile body is of a rectangular solid structure;
the prestressed tendons are embedded in the pile body along the length direction of the pile body, and are distributed along the profile of the cross section of the pile body;
the hoop reinforcement is sequentially wound around the prestressed reinforcement and fixed with the prestressed reinforcement;
the connecting assembly is at least arranged at one end of the pile body and used for connecting a support pile and exerting pre-tensioning stress on the prestressed tendons;
it is characterized in that the preparation method is characterized in that,
the width of the side surface vertical to the strong axis direction is larger than that of the side surface vertical to the weak axis direction;
in the direction parallel to the strong axis, the distance between the prestressed tendons is 65-125 mm;
the spacing of the prestressed tendons is 130-205mm in the direction parallel to the weak axis.
2. The pretensioned prestressed concrete rectangular solid support pile of claim 1,
the number of the prestressed tendons on the two side surfaces parallel to the strong axis direction is greater than or equal to that on the two side surfaces parallel to the weak axis direction;
the distance between the prestressed tendons and the outer side face of the pile body is larger than or equal to 40 mm.
3. The pretensioned prestressed concrete rectangular solid support pile of claim 1,
the distances from the axis of the prestressed tendon to the adjacent side face of the pile body are basically equal.
4. The pretensioned prestressed concrete rectangular solid support pile of claim 1,
the hoop reinforcement is spirally wound on the prestressed reinforcement.
5. The pretensioned prestressed concrete rectangular solid support pile of claim 1,
the connecting assembly includes:
and the end plate is provided with anchor holes corresponding to the prestressed tendons one by one and a plurality of bolt holes.
6. The pretensioned prestressed concrete rectangular solid support pile of claim 1,
the connection assembly further includes:
and the hoop is annularly arranged at the connection end of the pile body.
7. The pretensioned prestressed concrete rectangular solid support pile of claim 5,
the anchor hole communicates with the bolt hole, and an inner diameter of the bolt hole is larger than an inner diameter of the anchor hole.
8. The pretensioned prestressed concrete rectangular solid support pile of claim 1,
at least one end of the pile body is also provided with a mechanical connecting part which is arranged to connect the two pile bodies or to connect the upper end of the pile body with the bearing platform.
9. The pretensioned prestressed concrete rectangular solid support pile of claim 5,
the end plate is made of Q235B steel.
10. The pretensioned prestressed concrete rectangular solid support pile of claim 1, wherein the concrete strength rating is greater than or equal to C60.
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| CN202121547813.4U CN216515536U (en) | 2021-07-08 | 2021-07-08 | Pretensioning prestressed concrete rectangular solid supporting pile |
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| CN202121547813.4U CN216515536U (en) | 2021-07-08 | 2021-07-08 | Pretensioning prestressed concrete rectangular solid supporting pile |
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