CN219508547U - Prestressed rectangular bored pile - Google Patents

Abstract

The utility model provides a prestressed rectangular bored pile, which comprises a pile body of the bored pile and a reinforcement cage positioned in the pile body of the bored pile, wherein the cross sections of the pile body of the bored pile and the reinforcement cage are rectangular, the reinforcement cage is vertically divided into an anchoring section and a free section, the free section is positioned above the anchoring section, the anchoring section comprises a plurality of first stressed reinforcements arranged on a pit facing surface and a soil facing surface, the free section comprises a plurality of second stressed reinforcements arranged on the pit facing surface and the soil facing surface, and the first stressed reinforcements and the second stressed reinforcements are in one-to-one correspondence and are detachably connected through connectors; wherein, the first stress steel bar and the second stress steel bar are prestressed finish rolling screw thread steel bars. The prestressed finish rolling screw thread reinforcing steel bar is adopted as the stressed main reinforcement of the reinforcement cage, so that the tensile strength is high, the pile foundation cracking can be controlled by applying the prestressing force, the advantage of high strength of the finish rolling screw thread reinforcing steel bar is fully exerted, the reinforcement ratio is reduced, and the steel consumption is greatly reduced.

Description

Prestressed rectangular bored pile

Technical Field

The utility model relates to the technical field of foundation pit engineering construction, in particular to a prestressed rectangular bored pile.

Background

The foundation pit support structure is a temporary structure under most conditions, so that the design of the support structure should ensure the safety of foundation pit engineering and simultaneously consider the economical efficiency. The row pile support of the bored pile adopted in the foundation pit support structure occupies a significant position, and is widely applied, but the traditional bored pile is circular, and has the defects of low bearing efficiency and high material consumption as the foundation pit support structure: on one hand, when the round section member is bent, the bearing efficiency is low, and the longitudinal stress steel bars are uniformly distributed in a round shape, so that the pertinence is poor; on the other hand, the traditional bored pile adopts common steel bars as stressed steel bars, and the consumption of the steel bars is large because the strength of the common steel bars is low. Therefore, it is very necessary to study the bored pile for the foundation pit support, which has better bending resistance and is more economical.

The Chinese patent (publication No. CN 204530679U) discloses a rectangular bored pile, which can more effectively exert the material properties of concrete and steel bars by adopting a rectangular section and a steel bar cage, and improves the bending resistance and the bearing efficiency of the bored pile as an enclosure structure. However, the rectangular bored pile still adopts the traditional mode to arrange the reinforcement, the strength of the used reinforcement is not high, and the problems of large reinforcement arrangement amount, high cost and the like exist.

Disclosure of Invention

The utility model aims to provide a prestress rectangular bored pile, which solves the problems of large reinforcement amount, high cost and the like existing in the prior art that the rectangular bored pile adopts the traditional mode for reinforcement.

In order to achieve the above purpose, the utility model provides a prestress rectangular bored pile, which comprises a pile body of the bored pile and a reinforcement cage positioned in the pile body of the bored pile, wherein the cross sections of the pile body of the bored pile and the reinforcement cage are rectangular, the reinforcement cage is vertically divided into an anchoring section and a free section, the free section is positioned above the anchoring section, the anchoring section comprises a plurality of first stress reinforcements arranged on an earth facing surface and an earth facing surface, the free section comprises a plurality of second stress reinforcements arranged on the earth facing surface and the earth facing surface, and the first stress reinforcements and the second stress reinforcements are in one-to-one correspondence and are detachably connected through connectors; the first stress steel bars and the second stress steel bars are prestressed finish rolling threaded steel bars.

Optionally, when the cantilever of the free section is stressed, the number of the reinforcement bars of the first stressed reinforcement bar and the second stressed reinforcement bar on the pit facing surface is smaller than the number of the reinforcement bars on the soil facing surface.

Optionally, when the free section is connected with a horizontal support or an external anchor, the number of reinforcement bars of the first stressed steel bars and the second stressed steel bars on the pit facing surface is larger than the number of reinforcement bars on the soil facing surface.

Optionally, the first stressed steel bar is a bonded prestressed finish rolling deformed bar, and the second stressed steel bar is an unbonded prestressed finish rolling deformed bar.

Optionally, the reinforcement cage further comprises a rectangular stirrup, and the rectangular stirrup is used for connecting the first stress reinforcement or the second stress reinforcement of the pit facing surface and the soil facing surface.

Optionally, a tensioning assembly is arranged at the top of the free section, the tensioning assembly comprises a bearing plate and a plurality of tensioning nuts arranged on the bearing plate, and the top end of the second stressed steel bar penetrates through the bearing plate and then is in threaded connection with the tensioning nuts.

Optionally, the bottom of anchor section is provided with anchor subassembly, anchor subassembly includes anchor board and a plurality of setting are in anchor nut of anchor board below, the bottom of first atress reinforcing bar run through behind the anchor board with anchor nut threaded connection.

Optionally, the anchor board is two and parallel arrangement, two the anchor board is used for the anchorage respectively the first atress reinforcing bar on face that meets the pit with face meets the soil.

Optionally, the pile body of the cast-in-place pile is integrally cast by concrete.

The prestress rectangular bored pile provided by the utility model has at least one of the following beneficial effects:

1) The rectangular cross section is adopted to replace the conventional circular cross section, the bending resistance of the rectangular cross section is better than that of the circular cross section, and the bending rigidity of the rectangular cross section can be improved by 33% compared with that of the circular cross section under the conditions of equal cross section areas and consistent heights;

2) Under the same stress state, if the same bending resistance is achieved, the cross section area of the rectangular section can be reduced by about 30% compared with the circular section, and the consumption of concrete can be greatly reduced;

3) The finish rolling deformed bar is adopted as a longitudinal stressed main bar, the tensile strength of the finish rolling deformed bar is more than 2 times that of a common bar, the pile foundation can be controlled to crack by applying prestress, the advantage of high strength of the finish rolling deformed bar is fully exerted, the reinforcement ratio is reduced, the steel consumption is greatly reduced, and the engineering cost is reduced;

4) The reinforcement cage is manufactured on site, the finish rolling deformed bar is mechanically connected by utilizing self threads, the prestress can be applied by adopting a torque wrench, and the construction is simple and efficient.

Drawings

Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present utility model and do not constitute any limitation on the scope of the present utility model. Wherein:

fig. 1 is a schematic structural view of a prestressed rectangular bored pile according to an embodiment of the present utility model;

fig. 2 is a schematic cross-sectional view of a reinforcement cage anchoring segment provided in accordance with one embodiment of the present utility model;

FIG. 3 is a schematic view of a tensioning assembly according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of an anchoring assembly according to an embodiment of the present utility model.

In the accompanying drawings:

1-pile body of the filling pile; 2-an anchor section; 3-free segment; 4-a first stressed steel bar; 5-a second stressed steel bar; 6-rectangular stirrups; 7-tensioning the assembly; an 8-anchor assembly; a 9-connector;

70-bearing plate; 71-tensioning the nut; 80-an anchor plate; 81-anchoring the nut.

Detailed Description

The utility model will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the utility model more apparent. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for the purpose of facilitating and clearly aiding in the description of embodiments of the utility model. For a better understanding of the utility model with objects, features and advantages, refer to the drawings. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure for the understanding and reading of the present disclosure, and are not intended to limit the scope of the utility model, which is defined by the appended claims, and any structural modifications, proportional changes, or dimensional adjustments, which may be made by the present disclosure, should fall within the scope of the present disclosure under the same or similar circumstances as the effects and objectives attained by the present utility model.

As used in this disclosure, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this disclosure, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise. As used in this disclosure, the term "plurality" is generally employed in its sense including "at least one" unless the content clearly dictates otherwise. As used in this disclosure, the term "at least two" is generally employed in its sense including "two or more", unless the content clearly dictates otherwise. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", "a third" may include one or at least two such features, either explicitly or implicitly.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a prestressed rectangular bored pile according to an embodiment of the present utility model, where the prestressed rectangular bored pile includes a pile body 1 and a reinforcement cage located in the pile body 1, the cross sections of the pile body 1 and the reinforcement cage are rectangular, the reinforcement cage is vertically divided into an anchoring section 2 and a free section 3, the free section 3 is located above the anchoring section 2, the anchoring section 2 includes a plurality of first stress reinforcements 4 disposed on a pit-facing surface and a soil-facing surface, the free section 3 includes a plurality of second stress reinforcements 5 disposed on the pit-facing surface and the soil-facing surface, and the first stress reinforcements 4 and the second stress reinforcements 5 are in one-to-one correspondence and are detachably connected through connectors; wherein, the first stress steel bar 4 and the second stress steel bar 5 are prestressed finish rolling screw thread steel bars.

Specifically, the cross sections of the pile body 1 of the bored concrete pile and the steel reinforcement cage are rectangular, the rectangular cross section has better bending resistance than the circular cross section, and the bending rigidity of the rectangular cross section can be improved by 33% compared with the circular cross section under the conditions that the cross section areas are equal and the heights are consistent. In addition, under the same stress state, if the same bending resistance is achieved, the cross section area of the rectangular section can be reduced by about 30% compared with the circular section, and the consumption of concrete can be greatly reduced.

Alternatively, the rectangular bored pile may be drilled with a conventional drilling machine to form a round hole, and then reamed into a rectangular hole, or a special machine may be used to form a rectangular hole, which is not limited in the present utility model.

In this embodiment, the pile body 1 of the cast-in-place pile is integrally cast with concrete.

In this embodiment, when designing the reinforcement of the reinforcement cage, stress analysis may be performed according to the foundation pit supporting system, for example, when the free section 3 is connected with a horizontal support or an external anchor, the number of reinforcement of the first stress reinforcement 4 and the second stress reinforcement 5 on the pit facing surface is greater than the number of reinforcement on the earth facing surface, so as to ensure the supporting stability of the foundation pit. When the free section 3 is not required to be connected with a horizontal support (i.e. cantilever stress), the number of the first stress steel bars 4 and the second stress steel bars 5 on the pit facing surface can be smaller than that on the earth facing surface, and the steel consumption is reduced by reducing the number of the steel bars on the premise of ensuring enough bending resistance and tensile strength.

In this embodiment, the first stress steel bars 4 and the second stress steel bars 5 are prestressed finish rolling deformed bars. The tensile strength of the finish rolling deformed bar is more than 2 times that of a common bar, pile foundation cracking can be controlled by applying prestress, the advantage of high strength of the finish rolling deformed bar is fully exerted, the reinforcement ratio is reduced, and the steel consumption is greatly reduced. Moreover, the reinforcement cage can be manufactured on site, the finish rolling deformed bar is mechanically connected by utilizing self threads, and the prestress can be applied by adopting a torque wrench.

Preferably, the first stress steel bars 4 and the second stress steel bars 5 are respectively connected with two ends of the connector 9 in a threaded manner. In this embodiment, the connector 9 is a special connector 9 for finish rolling deformed bar commonly used in the market, and two ends of the connector are provided with internal threads for threaded connection with the first stressed steel bar 4 and the second stressed steel bar 5.

Preferably, the first stressed steel bar 4 is a bonded prestressed finish rolling deformed bar, and the second stressed steel bar 5 is an unbonded prestressed finish rolling deformed bar. The binding fine binding twisted steel is a conventional fine binding twisted steel, and the steel body of the binding fine binding twisted steel is directly contacted with concrete, so that the steel body and the concrete can be guaranteed to have enough binding force, and common stress is realized. The unbonded finish rolling twisted steel comprises a steel body, an inner sheath and an outer sheath, wherein the inner sheath is sleeved outside the steel body, and the outer sheath is sleeved outside the inner sheath and can mutually slide with the inner sheath under the action of external force. The adoption of the non-binding finish rolling deformed bar can effectively control the generation of cracks, and simultaneously can fully exert the advantage of high strength of the finish rolling deformed bar, so that the consumption of steel materials is greatly reduced.

In addition, the first stress steel bar 4 and the second stress steel bar 5 may be an integral finely-tied twisted steel bar, or may be formed by vertically splicing a plurality of finely-tied twisted steel bars by adopting the connector 9.

Referring to fig. 2, the reinforcement cage further includes a rectangular stirrup 6, where the rectangular stirrup 6 is used to connect the first stress reinforcement 4 or the second stress reinforcement 5 of the pit facing surface and the soil facing surface to form an integral reinforcement cage. Of course, in addition to the rectangular stirrup 6, tie bars, stand bars, and the like may be provided as required, and the present utility model is not particularly limited thereto.

Referring to fig. 3, a tensioning assembly 7 is disposed at the top of the free section 3, the tensioning assembly 7 includes a bearing plate 70 and a plurality of tensioning nuts 71 disposed on the bearing plate 70, and the top end of the second stressed steel bar 5 penetrates through the bearing plate 70 and is in threaded connection with the tensioning nuts 71. The tensioning nut 71 is used for applying prestress to tensioning the finish rolling twisted steel. In this embodiment, a torque wrench may be used to screw the tension nut 71 to apply and release the prestressing force. In this embodiment, the bearing plate 70 is a whole plate structure.

Referring to fig. 4, an anchor assembly 8 is disposed at the bottom of the anchor section 2, the anchor assembly 8 includes an anchor plate 80 and a plurality of anchor nuts 81 disposed below the anchor plate 80, and the bottom end of the first stressed steel bar 4 penetrates through the anchor plate 80 and is in threaded connection with the anchor nuts 81. The anchoring assembly 8 is used for further fixing the bottom end of the first stressed steel bar 4, so that the tensioning assembly 7 is convenient for tensioning the first stressed steel bar 4 and the second stressed steel bar 5.

In this embodiment, two anchor plates 80 are disposed in parallel, and the two anchor plates 80 are used to anchor the pit facing surface and the first stressed steel bar 4 on the soil facing surface respectively. The anchoring plate 80 may be designed as a strip shape, and a plurality of through holes are formed on the anchoring plate, and the number of the through holes is matched with the number of the first stressed steel bars 4 on the pit facing surface or the soil facing surface.

Based on this, with reference to fig. 1 to 4, the embodiment of the utility model further provides a construction method of the prestressed rectangular bored pile, which comprises the following steps:

s1, reinforcing bars are arranged according to a pit facing surface and a soil facing surface according to stress analysis of a foundation pit supporting system, and a reinforcement cage is manufactured;

s2, drilling rectangular holes;

s3, placing the steel bar cage after hole forming, and distinguishing the pit facing surface from the soil facing surface;

s4, pouring concrete and curing to reach the design strength to form rectangular piles;

s5, tensioning the second stressed steel bars 5, and applying prestress to the rectangular pile to form the prestress rectangular bored pile.

Firstly, executing step S1, and carrying out reinforcement arrangement according to a pit facing surface and a soil facing surface according to stress analysis of a foundation pit supporting system, so as to manufacture a reinforcement cage. For example, when the free section 3 is connected with a horizontal support or an external anchor, the number of reinforcement bars of the first stress reinforcement bars 4 and the second stress reinforcement bars 5 on the pit facing surface is greater than the number of reinforcement bars on the soil facing surface, so as to ensure the support stability of the foundation pit. When the cantilever of the free section 3 is stressed, the number of the reinforcement bars of the first stressed reinforcement bars 4 and the second stressed reinforcement bars 5 on the pit facing surface can be smaller than the number of the reinforcement bars on the soil facing surface, the reinforcement bars are reduced on the premise of ensuring enough bending resistance and tensile strength, and the steel consumption is reduced.

And then executing the step S2, drilling a rectangular hole, wherein a traditional drilling machine can be used for drilling a round hole, then reaming the round hole into the rectangular hole, and a special mechanical device can be used for forming the rectangular hole, so that the utility model is not limited.

And step S3, placing the steel reinforcement cage after hole forming, and distinguishing the pit facing surface from the soil facing surface.

And S4, pouring concrete and curing to reach the design strength to form the rectangular pile.

And finally, executing step S5, tensioning the first stressed steel bars 4 and the second stressed steel bars 5, and applying prestress to the rectangular pile to form the prestress rectangular bored pile. The tension nut 71 may be screwed with a torque wrench to apply and release the prestressing force. According to the embodiment, the prestressed finish rolling deformed bar is adopted as the stressed main bar of the reinforcement cage, the tensile strength is high, the pile foundation cracking can be controlled by applying the prestressing force, the advantage of high strength of the finish rolling deformed bar is fully exerted, the reinforcement ratio is reduced, and the steel consumption is greatly reduced.

In summary, the embodiment of the utility model provides a prestress rectangular bored pile, which adopts a rectangular section to replace a conventional round section, the rectangular section has better bending resistance than the round section, the section utilization rate is high, the section size can be effectively reduced, and the concrete consumption is reduced. Meanwhile, the finish rolling deformed bar is adopted as a longitudinal stressed main bar, the tensile strength of the finish rolling deformed bar is more than 2 times that of a common bar, pile foundation cracking can be controlled by applying prestress, the advantage of high strength of the finish rolling deformed bar is fully exerted, the reinforcement ratio is reduced, the steel consumption is greatly reduced, and therefore, the engineering cost is greatly reduced.

The above description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the present utility model. It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, the present utility model is intended to include such modifications and alterations insofar as they come within the scope of the utility model or the equivalents thereof.

Claims (9)

1. The prestress rectangular bored pile is characterized by comprising a bored pile body and a reinforcement cage positioned in the bored pile body, wherein the cross sections of the bored pile body and the reinforcement cage are rectangular, the reinforcement cage is vertically divided into an anchoring section and a free section, the free section is positioned above the anchoring section, the anchoring section comprises a plurality of first stress reinforcements arranged on an earth facing surface and an earth facing surface, the free section comprises a plurality of second stress reinforcements arranged on the earth facing surface and the earth facing surface, and the first stress reinforcements and the second stress reinforcements are in one-to-one correspondence and are detachably connected through connectors; the first stress steel bars and the second stress steel bars are prestressed finish rolling threaded steel bars.

2. The pre-stressed rectangular bored pile according to claim 1, wherein when the free section cantilever is stressed, the number of reinforcement bars of the first stressed steel bar and the second stressed steel bar on the pit facing surface is smaller than the number of reinforcement bars on the earth facing surface.

3. The pre-stressed rectangular bored pile according to claim 2, wherein when the free section is connected with a horizontal support or an external anchor, the number of reinforcement bars of the first stressed steel bar and the second stressed steel bar on the pit facing surface is greater than the number of reinforcement bars on the earth facing surface.

4. A prestressed rectangular bored pile according to any one of claims 1 to 3, wherein the first stressed steel bar is a bonded prestressed finish-rolled screw bar and the second stressed steel bar is an unbonded prestressed finish-rolled screw bar.

5. The pre-stressed rectangular bored pile of claim 1, wherein the reinforcement cage further comprises rectangular stirrups for connecting the first or second stressed reinforcement of the pit-facing surface and the earth-facing surface.

6. The prestressed rectangular bored pile according to claim 1, wherein a tensioning assembly is arranged at the top of the free section, the tensioning assembly comprises a bearing plate and a plurality of tensioning nuts arranged on the bearing plate, and the top ends of the second stressed steel bars penetrate through the bearing plate and are in threaded connection with the tensioning nuts.

7. The pre-stressed rectangular bored pile according to claim 1, wherein an anchoring assembly is arranged at the bottom of the anchoring section, the anchoring assembly comprises an anchoring plate and a plurality of anchoring nuts arranged below the anchoring plate, and the bottom end of the first stressed steel bar penetrates through the anchoring plate and is in threaded connection with the anchoring nuts.

8. The pre-stressed rectangular bored pile according to claim 7, wherein two anchor plates are arranged in parallel, and the two anchor plates are used for respectively anchoring the first stressed steel bars on the pit facing surface and the earth facing surface.

9. The pre-stressed rectangular bored pile according to claim 1, wherein the pile body is formed by integrally casting concrete.