Cast-in-place pile foundation structure facilitating assembly of prefabricated pier
By setting up vertical docking cylinders and annular docking plates on cast-in-place pile foundations, the rapid assembly and strong node connection of prefabricated piers are achieved, and the problem that prefabricated piers in the prior art cannot meet the requirements of strong node weak components is ensured. The security and stability of the bridge.
Patent Information
- Application Number
- CN202420180379.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-25
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-01-25
AI Technical Summary
In the prior art, the installation of prefabricated pier columns above the cast-in-place pile foundation cannot meet the requirements of strong nodes and weak components, and cannot ensure the connection strength between piles and columns, which in turn affects the safety and stability of the bridge.
Provided is a cast-in-place pile foundation structure including a cast-in-place pile basic body and a docking assembly, the assembly includes a vertical butt cylinder and an annular butt plate, and the inner cavity of the vertical butt cylinder is filled with a concrete core of equal strength for use with prefabricated piers. The column docking, and the annular docking plate separates the height of the vertical docking cylinder to ensure the connection strength.
The rapid assembly of cast-in-place pile foundations and prefabricated pier columns is achieved, ensuring the strength of the connection between piles and columns, and ensuring the safety and stability of the bridge.
Smart Images
Figure CN222295046U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge engineering, in particular to a cast-in-place pile foundation structure which is convenient for assembling prefabricated bridge piers. Background Art
[0002] The prefabrication and assembly of existing bridges began with the superstructure, forming a relatively complete standardization system for the design and construction of prefabricated superstructures; the prefabrication and assembly of the lower supporting structure started relatively late, with a relatively low assembly rate, mainly including prefabricated pipe piles, prefabricated piers, prefabricated cap beams, and a combination of one or more of them. The prefabrication and assembly of the lower supporting structure of the bridge is conducive to improving construction quality, accelerating construction progress, and reducing environmental impact.
[0003] Conventional bridge piers usually use cast-in-place caps to connect with prefabricated pile groups. The on-site cast-in-place formwork and excavation of the cap foundation pit are heavy and take a long time to strengthen, which is contrary to the concept of prefabricated bridges. If cast-in-place pile foundations are used in the prior art, it is necessary to cast piers after the cast-in-place caps to ensure the connection strength of the piers, which leads to problems such as heavy workload and long time to strengthen. If prefabricated piers are directly placed on top of the cast-in-place pile foundations, the requirements of strong nodes and weak components cannot be met, the connection strength between piles and columns cannot be guaranteed, and the safety and stability of the bridge cannot be guaranteed.
[0004] In view of this, it is necessary to propose a cast-in-place pile foundation structure that is convenient for assembling prefabricated piers to solve or at least alleviate the above-mentioned defects. Utility Model Content
[0005] The main purpose of the utility model is to provide a cast-in-place pile foundation structure that is convenient for assembling prefabricated bridge piers, so as to solve the technical problem in the prior art that carrying prefabricated piers on top of cast-in-place pile foundations cannot meet the requirements of strong nodes and weak components, cannot ensure the connection strength between piles and columns, and thus cannot ensure the safety and stability of the bridge.
[0006] To achieve the above-mentioned purpose, the utility model provides a cast-in-place pile foundation structure which is convenient for assembling prefabricated bridge piers, comprising a cast-in-place pile basic body and a docking assembly, wherein the docking assembly comprises a vertical docking cylinder, the inner cavity of the vertical docking cylinder is filled with a concrete core having the same strength as the concrete of the cast-in-place pile basic body, the vertical docking cylinder comprises a lower embedded section embedded in the cast-in-place pile basic body and an upper docking section which protrudes upward from the top surface of the cast-in-place pile basic body and is used to connect with the prefabricated pier column.
[0007] Preferably, the docking assembly also includes an annular docking plate, which is connected to the middle of the outer peripheral wall of the vertical docking cylinder, and the annular docking plate is located at the top of the cast-in-place pile basic body. The annular docking plate separates the vertical docking cylinder into the upper docking section and the lower embedded section in the height direction, and the top surface of the annular docking plate is connected to the bottom surface of the prefabricated pier.
[0008] Preferably, the top of the cast-in-place pile foundation is stepped, including a first mounting surface and a second mounting surface flush with the top surface of the annular docking plate, and the first mounting surface is lower in height than the second mounting surface.
[0009] Preferably, the height difference between the first mounting surface and the second mounting surface is set between 20-30 cm.
[0010] Preferably, the radial dimension of the first installation surface along the cast-in-place pile basic body is set at 5 to 10 cm.
[0011] Preferably, the longitudinal main reinforcement of the cast-in-place pile foundation has an extension section extending from the first installation surface, and the extension section is distributed in a "J" shape. The length of the outer limb of the longitudinal main reinforcement of the pile foundation is smaller than the length of the inner limb, and the length of the outer limb of the longitudinal main reinforcement of the pile foundation pre-buried downward in the cast-in-place pile foundation is not less than the anchorage length of the steel bar.
[0012] Preferably, the diameter of the vertical docking cylinder is set to 0.2-0.5d, the length is set to 0.3-1d, and the wall thickness is set to 4-25mm; wherein d is the outer diameter of the cast-in-place pile basic body.
[0013] Preferably, a plurality of docking guide blocks arranged at intervals around the vertical docking cylinder are provided on the upper portion of the outer side wall of the vertical docking cylinder, and the cross-sectional dimensions of the docking guide blocks gradually increase from top to bottom.
[0014] Preferably, the number of the docking guide blocks is set to 2 to 6 and they are evenly spaced around the outer circumference of the vertical docking cylinder.
[0015] Preferably, the outer wall of the vertical docking cylinder is provided with a plurality of first stiffening plates arranged at intervals around the vertical docking cylinder below the annular docking plate, and the radial width of the first stiffening plates along the annular docking plate is smaller than the radial width of the annular docking plate; and / or a second stiffening plate is connected between two adjacent first stiffening plates.
[0016] Compared with the prior art, the utility model has the following beneficial effects:
[0017] The utility model provides a cast-in-place pile foundation structure that is convenient for assembling prefabricated bridge piers, including a cast-in-place pile basic body and a docking assembly, wherein the docking assembly includes a vertical docking cylinder, the inner cavity of the vertical docking cylinder is filled with a concrete core with the same strength as the concrete of the cast-in-place pile basic body, the vertical docking cylinder includes a lower embedded section embedded in the cast-in-place pile basic body and an upper docking section protruding upward from the top surface of the cast-in-place pile basic body and used to be connected with the prefabricated pier column; the docking assembly also includes an annular docking plate, the annular docking plate is connected to the middle of the outer peripheral wall of the vertical docking cylinder, the annular docking plate is located at the top of the cast-in-place pile basic body, the annular docking plate separates the vertical docking cylinder into an upper docking section and a lower embedded section in the height direction, and the top surface of the annular docking plate is connected with the bottom surface of the prefabricated pier column. The present application can realize the rapid assembly of cast-in-place pile foundations and prefabricated pier columns through the docking assembly, and has the advantages of strong nodes and weak components after assembly, can ensure the connection strength between piles and columns, and thus ensure the safety and stability of the bridge. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;
[0020] Figure 2 for Figure 1 A is an enlarged schematic diagram;
[0021] Figure 3 A top view of the overall structure of an embodiment of the utility model;
[0022] Figure 4 It is a structural schematic diagram of a docking assembly in one embodiment of the utility model;
[0023] Figure 5 This is a diagram of an application scenario after the pile base body and the prefabricated pier column in one embodiment of the utility model are connected.
[0024] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.
[0025] Description of Figure Numbers:
[0026] 10. Cast-in-place pile basic body; 110. First installation surface; 120. Second installation surface; 130. Longitudinal main reinforcement of pile foundation; 131. Extension section; 132. Outer limb of longitudinal main reinforcement of pile foundation; 133. Inner limb of longitudinal main reinforcement of pile foundation; 134. Local annular stirrups; 20. Docking assembly; 210. Vertical docking cylinder; 211. Lower embedded section; 212. Upper docking section; 213. Concrete core filling; 220. Docking guide block; 230. First stiffening plate; 240. Annular docking plate; 30. Prefabricated pier column. DETAILED DESCRIPTION
[0027] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as described in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0030] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0031] See also Figures 1 to 5In one embodiment, the utility model provides a cast-in-place pile foundation structure that is convenient for assembling prefabricated piers, including a cast-in-place pile basic body 10 and a docking assembly 20, wherein the docking assembly 20 includes a vertical docking cylinder 210, the inner cavity of the vertical docking cylinder 210 is filled with a concrete core 213 with the same strength as the concrete of the cast-in-place pile basic body 10, and the vertical docking cylinder 210 includes a lower embedded section 211 embedded in the cast-in-place pile basic body 10 and an upper docking section 212 protruding upward from the top surface of the cast-in-place pile basic body 10 and used for docking with a prefabricated pier column 30.
[0032] Specifically, the docking assembly 20 is provided to facilitate the rapid assembly between the prefabricated pier column 30 and the cast-in-place pile basic body 10. During assembly, the prefabricated pier column 30 is hoisted, and the upper docking section 212 of the vertical docking cylinder 210 is inserted into the hollow part of the prefabricated pier column 30, so that the prefabricated pier column 30 can be quickly assembled to the top of the prefabricated pier column 30. The inner cavity of the vertical docking cylinder 210 is filled with the same concrete as the concrete of the cast-in-place pile basic body 10.
[0033] As a preferred example, the diameter of the vertical docking cylinder 210 is set to 0.2-0.5d, the length is set to 0.3-1d, and the wall thickness is set to 4-25mm; wherein d is the outer diameter of the cast-in-place pile basic body 10.
[0034] It is also worth noting that the lower embedded section 211 pre-embedded in the cast-in-place pile basic body 10 and the concrete core 213 filled in the inner cavity of the vertical butt joint cylinder 210 can greatly improve the seismic ductility of the pier structure. By filling the interior of the vertical butt joint cylinder 210 with concrete to form a CFST tenon, as an important component of the connection joint, the ductility and shear resistance of the joint are greatly increased, and the brittle failure of the joint can be prevented.
[0035] As a preferred embodiment, the docking assembly 20 also includes an annular docking plate 240, which is connected to the middle of the outer peripheral wall of the vertical docking cylinder 210, and the annular docking plate 240 is located at the top of the cast-in-place pile basic body 10. The annular docking plate 240 divides the vertical docking cylinder 210 into the upper docking section 212 and the lower embedded section 211 in the height direction, and the top surface of the annular docking plate 240 is connected to the bottom surface of the prefabricated pier 30.
[0036] In this embodiment, by setting the annular docking plate 240, when the prefabricated pier column 30 and the cast-in-place pile basic body 10 are assembled and docked, the prefabricated pier column 30 is hoisted above the cast-in-place pile basic body 10, and finally the top surface of the annular docking plate 240 is connected to the bottom surface of the prefabricated pier column 30. Furthermore, the annular docking plate 240 and the steel end plate (not shown) arranged on the bottom surface of the prefabricated pier column 30 can be welded to increase the force bearing area and stability of the connection, and the structural strength of the connection can also be improved. Furthermore, the annular docking plate 240 and the outer wall of the vertical docking cylinder 210 can be welded or integrally formed.
[0037] As a preferred embodiment, the top of the cast-in-place pile foundation is stepped, including a first mounting surface 110 and a second mounting surface 120 flush with the top surface of the annular docking plate 240, and the first mounting surface 110 is lower in height than the second mounting surface 120. As a preferred example, the height difference between the first mounting surface 110 and the second mounting surface 120 is set between 20-30 cm; the radial dimension of the first mounting surface 110 along the cast-in-place pile basic body 10 is set between 5 and 10 cm.
[0038] Specifically, Figure 2 As shown, the top of the cast-in-place pile basic body 10 is stepped, and a groove of a certain height and a certain thickness is provided on the top edge of the cast-in-place pile basic body 10, which is stepped in shape. Ultra-high performance concrete (UHPC) can be used for filling in the later stage, and the longitudinal section of the formed UHPC tubular grouting layer is Γ-shaped (similar to the shape of a kitchen knife plus a handle). It is worth noting that this Γ-shape can move the interface between the UHPC and the ordinary concrete of the cast-in-place pile basic body 10 downward to the lower end face with greater rigidity (there is a height difference between the lower end face and the top face of the pile), thereby avoiding the fiber discontinuity and shrinkage incoordination of the interface between the UHPC and the ordinary concrete of the cast-in-place pile basic body 10 at the pile top section of the cast-in-place pile basic body 10. The weakening of the cross section caused by the stress cracking and the durability of the pile-column joint is improved. In a specific example, a groove with a height of 20-30 cm (i.e., the radial dimension of the first installation surface 110 along the cast-in-place pile basic body 10 is set at 5-10 cm) and a thickness of 5-10 cm is provided downward from the top edge of the pile foundation (i.e., the radial dimension of the first installation surface 110 along the cast-in-place pile basic body 10 is set at 5-10 cm), and the groove interface is roughened. After the prefabricated pier 30 is hoisted into place, a tubular grouting layer with a Γ-shaped cross-section is poured using UHPC.
[0039] As a preferred embodiment, the longitudinal main reinforcement 130 of the cast-in-place pile foundation has an extension section 131 extending from the first mounting surface 110, and the extension section 131 is distributed in a "J" shape. The length of the outer limb 132 of the longitudinal main reinforcement of the pile foundation is less than the length of the outer limb 133 of the longitudinal main reinforcement of the pile foundation, and the length of the outer limb 132 of the longitudinal main reinforcement of the pile foundation pre-buried downward in the cast-in-place pile foundation is not less than the anchoring length of the steel bar.
[0040] Specifically, you can combine the attached Figure 2 and Figure 5 The longitudinal main reinforcement 130 of the pile foundation of the cast-in-place pile basic body 10 is distributed in a "J" shape in the range of the pile top, which can effectively improve the anchoring capacity of the longitudinal main reinforcement 130 of the pile foundation, reduce the steel bar joints and on-site workload, shorten the height of the grouting structure layer, and save engineering costs; at the same time, it also strengthens the bearing capacity reserve of the joint section, and the length of the outer limb 132 of the longitudinal main reinforcement of the pile foundation is less than the length of the outer limb 133 of the longitudinal main reinforcement of the pile foundation, that is, the short steel bar is located on the outside of the longitudinal main reinforcement 130 of the pile foundation, and the force efficiency is better than the main reinforcement, while ensuring the effective bonding between the pile foundation concrete and the grouting structure layer.
[0041] As a preferred embodiment, a plurality of docking guide blocks 220 are arranged at intervals around the vertical docking cylinder 210 on the upper portion of the outer side wall of the vertical docking cylinder 210, and the cross-sectional dimensions of the docking guide blocks 220 gradually increase from top to bottom.
[0042] Specifically, a docking guide block 220 is provided on the side wall of the vertical docking cylinder 210, so that the vertical docking cylinder 210 and the prefabricated pier 30 are guided to dock by the docking guide block 220, for example, the upper docking section 212 of the vertical docking cylinder is quickly guided to be inserted into the central cavity of the prefabricated pier 30. Furthermore, the docking guide block 220 and the vertical docking cylinder 210 are welded or integrally formed.
[0043] As a preferred example, the number of the docking guide blocks 220 is set to 2 to 6 and are evenly spaced around the outer circumference of the vertical docking cylinder 210. In other embodiments, the number and arrangement of the docking guide blocks 220 can also be other forms, and those skilled in the art can set them according to actual needs.
[0044] As another preferred embodiment, the outer wall of the vertical docking cylinder 210 is provided with a plurality of first stiffening plates 230 arranged at intervals around the vertical docking cylinder 210 below the annular docking plate 240, and the radial width of the first stiffening plate 230 along the annular docking plate 240 is smaller than the radial width of the annular docking plate 240; and / or a second stiffening plate (not shown) is connected between two adjacent first stiffening plates 230.
[0045] By providing a stiffening plate, the stiffening plate is connected to the annular docking plate 240, so that the structural strength of the annular docking plate 240 can be improved. In one embodiment, the outer wall of the vertical docking cylinder 210 is provided with a plurality of first stiffening plates 230 arranged around the vertical docking cylinder 210 below the annular docking plate 240, and the radial width of the first stiffening plates 230 along the annular docking plate 240 is smaller than the radial width of the annular docking plate 240; and a second stiffening plate is connected between two adjacent first stiffening plates 230. By providing the first stiffening plate 230 and the second stiffening plate at the same time, that is, a bidirectional stiffening plate is provided below the annular docking plate 240, the structural strength of the vertical docking cylinder 210 and the annular docking plate 240 can be significantly improved. In a preferred example, the second stiffening plate is an arc-shaped plate, and is arranged coaxially with the vertical docking cylinder 210.
[0046] As a preferred example, the number of the first stiffening plates 230 is 4 to 12, and they are evenly spaced and arranged along the circumferential direction of the annular docking plate 240. In other embodiments, the number of the first stiffening plates 230 can also be set to other numbers according to actual needs. The first stiffening plates 230 and the vertical docking cylinder 210 and the annular docking plate 240 can be welded or integrally formed.
[0047] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A cast-in-place pile foundation structure that facilitates the assembly of prefabricated bridge piers, characterized in that: It comprises a cast-in-place pile basic body and a docking assembly, wherein the docking assembly comprises a vertical docking cylinder, the inner cavity of the vertical docking cylinder is filled with a concrete core having the same strength as the concrete of the cast-in-place pile basic body, and the vertical docking cylinder comprises a lower embedded section embedded in the cast-in-place pile basic body and an upper docking section protruding upward from the top surface of the cast-in-place pile basic body and used for docking with a prefabricated pier.
2. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 1, characterized in that: The docking assembly also includes an annular docking plate, which is connected to the middle of the outer peripheral wall of the vertical docking cylinder, and is located at the top of the cast-in-place pile basic body. The annular docking plate divides the vertical docking cylinder into the upper docking section and the lower embedded section in the height direction, and the top surface of the annular docking plate is connected to the bottom surface of the prefabricated pier.
3. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 2, characterized in that: The top of the cast-in-place pile foundation is stepped, including a first mounting surface and a second mounting surface flush with the top surface of the annular docking plate, and the first mounting surface is lower in height than the second mounting surface.
4. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 3, characterized in that: The height difference between the first mounting surface and the second mounting surface is set between 20-30 cm.
5. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 3, characterized in that: The radial dimension of the first installation surface along the basic body of the cast-in-place pile is set at 5 to 10 cm.
6. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 3, characterized in that: The longitudinal main reinforcement of the cast-in-place pile foundation has an extension section extending from the first installation surface, and the extension section is distributed in a "J" shape. The length of the outer limb of the longitudinal main reinforcement of the pile foundation is smaller than the length of the inner limb. The length of the outer limb of the longitudinal main reinforcement of the pile foundation pre-buried downward in the cast-in-place pile foundation is not less than the anchoring length of the steel bar.
7. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to any one of claims 1 to 6, characterized in that: The diameter of the vertical butt-jointed cylinder is set to 0.2-0.5d, the length is set to 0.3-1d, and the wall thickness is set to 4-25mm; wherein d is the outer diameter of the basic body of the cast-in-place pile.
8. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 1, characterized in that: A plurality of docking guide blocks are arranged at intervals around the vertical docking cylinder body on the upper portion of the outer side wall of the vertical docking cylinder body, and the cross-sectional dimensions of the docking guide blocks gradually increase from top to bottom.
9. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 8, characterized in that: The number of the docking guide blocks is set to 2 to 6 and they are evenly spaced around the outer circumference of the vertical docking cylinder.
10. The cast-in-place pile foundation structure for facilitating the assembly of prefabricated bridge piers according to claim 2, characterized in that: The outer side wall of the vertical docking cylinder is provided with a plurality of first stiffening plates arranged at intervals around the vertical docking cylinder below the annular docking plate, wherein the radial width of the first stiffening plates along the annular docking plate is smaller than the radial width of the annular docking plate; and / or a second stiffening plate is connected between two adjacent first stiffening plates.