Prefabricated bridge foundation

Abstract

The utility model provides a prefabricated bridge foundation which comprises a prefabricated pipe pile and a prefabricated bearing platform connected to the top of the prefabricated pipe pile, the top of the prefabricated bearing platform is downwards concavely provided with a pier column socket hole for butt joint of a pier column, and the bottom of the prefabricated bearing platform is upwards concavely provided with a pile foundation socket hole for butt joint of the prefabricated pipe pile. The top of the prefabricated bearing platform is provided with a material filling hole communicating with the pile foundation socket hole, the hole diameter of the material filling hole is smaller than that of the pile foundation socket hole, the top of the prefabricated pipe pile is inserted into the pile foundation socket hole, and a tubular pouring space is formed between the pile foundation socket hole and the prefabricated pipe pile. A grouting channel communicating with the material filling hole and the tubular pouring space is pre-buried in the bottom of the prefabricated bearing platform, the ductile concrete is poured into the prefabricated tubular pile and the material filling hole through the material filling hole, and the ductile concrete is further poured into the tubular pouring space through the grouting channel to form a tubular structure layer. Connection among the prefabricated bearing platform, the prefabricated pipe pile and the pier column can be achieved, the construction efficiency is improved, the construction period is shortened, and the work amount is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a prefabricated assembled bridge foundation. Background Art

[0002] The prefabrication and assembly of bridge foundations is conducive to improving construction quality, accelerating construction progress, and reducing environmental impact. It has important application prospects in ecologically sensitive areas such as lake areas.

[0003] At present, the combination of pile foundation and cap is a very common and important structural form in bridge foundation. This structural form is not only widely used in highway bridges and railway bridges, but also common in large-scale buildings, port terminals and other engineering fields. However, the size of prefabricated pipe piles for bridges is usually small (diameter 0.4-0.8m), and a single pile cannot meet the force requirements of the bridge structure. Therefore, conventional pier foundations usually use cast-in-place caps to connect with prefabricated pile groups. However, the on-site cast-in-place formwork and cap foundation pit excavation work are large and take a long time to strengthen, which is contrary to the concept of prefabricated bridges.

[0004] In addition, the prefabricated pedestal needs to be connected with the upper pier, the lower pile foundation and the side tie beam. The existing technology lacks a reasonable structure to enable the prefabricated pedestal to achieve a reliable connection effect, which makes the structure have a greater safety risk.

[0005] In view of this, it is necessary to propose a prefabricated assembled bridge foundation to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0006] The main purpose of the utility model is to provide a prefabricated assembled bridge foundation to solve the technical problems that conventional pier foundations usually adopt cast-in-place caps to be connected with prefabricated pile groups, which has the problems of large workload of cap foundation pit excavation and long time for strengthening.

[0007] To achieve the above-mentioned purpose, the utility model provides a prefabricated assembled bridge foundation, comprising a prefabricated pipe pile and a prefabricated cap connected to the top of the prefabricated pipe pile, wherein:

[0008] The top of the precast cap is recessed downwardly to provide a pier socket for docking with the pier, the bottom of the precast cap is recessed upwardly to provide a pile foundation socket for docking with the precast pipe pile, the top of the precast cap is provided with a grouting hole connected with the pile foundation socket, the aperture of the grouting hole is smaller than the aperture of the pile foundation socket, the top of the precast pipe pile is inserted into the pile foundation socket, and a tubular casting space is formed between the pile foundation socket and the precast pipe pile, the bottom of the precast cap is pre-buried with a grouting channel connecting the grouting hole and the tubular casting space, ductile concrete is poured into the interior of the precast pipe pile and the grouting hole through the grouting hole, and ductile concrete is also poured into the tubular casting space through the grouting channel to form a tubular structural layer.

[0009] Preferably, the precast pipe pile includes a pipe pile body, a supporting plate, and anchoring steel bars. Among them, the supporting plate is hermetically connected to the inner wall of the pipe pile body, one end of the anchoring steel bar is connected to the top of the supporting plate, and the other end extends upward and is flush with the top of the grouting hole; wherein, the ductile concrete is poured through the grouting hole into the space above the top of the supporting plate to form a core-filled concrete structure.

[0010] Preferably, a plurality of positive U-shaped steel bars surrounding the pier column socket are embedded in the precast bearing platform. Each positive U-shaped steel bar includes a transverse steel bar section arranged at the bottom of the pier column socket and two side limb sections respectively arranged on both sides of the pier column socket. Among them, each side limb section extends upward from the transverse steel bar section and extends out of the top of the precast bearing platform.

[0011] Preferably, the grouting hole includes an equal-diameter hole section from top to bottom and a gradually varying hole section with a gradually increasing hole diameter. The hole diameter at the top of the gradually varying hole section is equal to the hole diameter of the equal-diameter hole section, and the hole diameter at the bottom of the gradually varying hole section is equal to the inner diameter of the pipe pile body.

[0012] Preferably, each side limb section includes a side limb extending section, a vertical steel bar joint embedded in the precast bearing platform, and a side limb embedded section. The side limb embedded section is connected to the vertical steel bar joint and extends downward to be connected to the transverse steel bar section. The side limb extending section is detachably connected to the vertical steel bar joint and extends upward beyond the precast bearing platform.

[0013] Preferably, the plurality of positive U-shaped steel bars are arranged at equal intervals around the pier column socket.

[0014] Preferably, the number of the precast bearing platforms in the transverse bridge direction is two, and the two precast bearing platforms are connected by a precast tie beam. A post-cast joint is provided between the precast tie beam and the precast bearing platform.

[0015] Preferably, the supporting plate and the anchoring steel bars are welded.

[0016] Preferably, the transverse steel bar section and the side limb section are integrally formed.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a prefabricated assembled bridge foundation, comprising a prefabricated pipe pile and a prefabricated cap connected to the top of the prefabricated pipe pile, the top of the prefabricated cap is concavely provided with a pier column socket hole for docking with the pier column, the bottom of the prefabricated cap is concavely provided with a pile foundation socket hole for docking with the prefabricated pipe pile, the top of the prefabricated cap is provided with a grouting hole connected with the pile foundation socket hole, the aperture of the grouting hole is smaller than the aperture of the pile foundation socket hole, the top of the prefabricated pipe pile is inserted into the pile foundation socket hole, and a tubular casting space is formed between the pile foundation socket hole and the prefabricated pipe pile, the bottom of the prefabricated cap is pre-buried with a grouting channel connecting the grouting hole and the tubular casting space, ductile concrete is poured into the interior of the prefabricated pipe pile and the grouting hole through the grouting hole, and the ductile concrete is also poured into the tubular casting space through the grouting channel to form a tubular structural layer. The present application can realize the prefabricated assembled connection between the prefabricated cap, prefabricated pipe piles and piers, which has reliable connection, improved safety, improved construction efficiency, shortened construction period and reduced engineering workload. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 3 It is a schematic diagram of the overall structure and the pier connection in one embodiment of the utility model.

[0023] 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.

[0024] Description of Figure Numbers:

[0025] 10, Prefabricated pipe pile; 110, Pipe pile body; 120, Supporting plate; 130, Anchor reinforcement; 140, Core-filled concrete structure; 20, Prefabricated bearing platform; 210, Pier column socket; 220, Pile foundation socket; 230, Filling hole; 231, Equal-diameter hole section; 232, Gradual change hole section; 240, Grouting channel; 250, Positive U-shaped steel bar; 251, Horizontal steel bar section; 252, Side limb section; 2521, Side limb extending section; 2522, Side limb embedded section; 2523, Vertical steel bar joint; 30, Tubular structure layer; 40, Prefabricated cross beam; 410, Post-cast joint; 50, Pier column; 510, Longitudinal main steel bars of pier column. Detailed implementation manners

[0026] 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.

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that all the directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as described in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0029] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0030] Please refer to Figures 1 to 3 , a prefabricated and assembled bridge foundation in an embodiment provided by the present invention, includes a prefabricated pipe pile 10 and a prefabricated bearing platform 20 connected to the top of the prefabricated pipe pile 10, wherein,

[0031] The top of the prefabricated cap 20 is recessed downwardly to form a pier socket 210 for docking with the pier 50, and the bottom of the prefabricated cap 20 is recessed upwardly to form a pile foundation socket 220 for docking with the prefabricated pipe pile 10. The top of the prefabricated cap 20 is provided with a grouting hole 230 connected to the pile foundation socket 220, and the aperture of the grouting hole 230 is smaller than the aperture of the pile foundation socket 220. The top of the prefabricated pipe pile 10 is inserted into the pile foundation socket 220. A tubular casting space is formed between the pile foundation socket 220 and the prefabricated pipe pile 10. A grouting channel 240 connecting the grouting hole 230 and the tubular casting space is pre-buried at the bottom of the prefabricated foundation 20. Ductile concrete is poured into the interior of the prefabricated pipe pile 10 and the grouting hole 230 through the grouting hole 230. Ductile concrete is also poured into the tubular casting space (not shown) through the grouting channel 240 to form a tubular structural layer 30.

[0032] Specifically, the top of the prefabricated cap 20 is recessed downward to form a pier column socket 210 for docking with the pier column 50, so as to facilitate docking with the pier column 50. Figure 3 As shown, the lower end of the pier 50 is inserted into the pier socket 210, and then the connection between the pier 50 and the precast cap 20 is achieved by grouting. Secondly, the bottom of the precast cap 20 is upwardly recessed with a pile foundation socket 220 that matches the precast pipe pile 10, ensuring that the precast pipe pile 10 can be accurately and firmly inserted. The top of the precast cap 20 is also provided with a grouting hole 230 connected to the pile foundation socket 220 for pouring ductile concrete. The bottom of the precast cap 20 is pre-buried with a grouting channel 240 connecting the grouting hole 230 and the tubular casting space, ensuring that the concrete can smoothly pass through the grouting hole 230 and enter and fill the tubular casting space through the grouting channel 240.

[0033] As a preferred example, the bottom of the cap is placed on the ground, so no template is required at the bottom when pouring the tubular pouring space. The prefabricated cap 20 and the prefabricated pipe pile 10 are tightly connected by grouting, which greatly improves the integrity and stability of the structure and enhances the seismic resistance of the structure.

[0034] It is also worth noting that conventional bridge piers usually use cast-in-place caps to connect with prefabricated pile groups. The on-site cast-in-place formwork of the caps and the excavation of the cap foundation pit are heavy and take a long time to strengthen. However, the present application can achieve prefabricated and assembled connections between the prefabricated caps 20 and the prefabricated pipe piles 10 and the pier columns 50, thereby improving construction efficiency, shortening construction period, and reducing engineering workload.

[0035] Furthermore, the number of the grouting holes 230 is set to be multiple, and a horizontal connecting channel (not shown) can be set between the grouting holes 230 to provide a backup grouting channel 240 when the hole is accidentally blocked during construction.

[0036] As a preferred embodiment, the precast pipe pile 10 includes a pipe pile body 110, a support plate 120 and anchor reinforcement bars 130. Among them, the support plate 120 is sealingly connected to the inner wall of the pipe pile body 110, and one end of the anchor reinforcement bar 130 is connected to the top of the support plate 120, and the other end extends upward and is flush with the top of the grouting hole 230. Among them, ductile concrete is poured through the grouting hole 230 into the space above the top of the support plate 120 to form a core-filled concrete structure 140.

[0037] Specifically, the precast pipe pile 10 is composed of three parts: a pipe pile body 110, a support plate 120 and anchor reinforcement bars 130. The pipe pile body 110, as the main load-bearing structure, has high strength and durability. The support plate 120 is sealingly connected to the inner wall of the pipe pile body 110 to play a role in closing and protecting the internal space. The anchor reinforcement bars 130 connect the support plate 120 and the grouting hole 230 to ensure the integrity and stability of the structure. During the construction process, first ensure that the precast pipe pile 10 is accurately inserted into the pile foundation socket 220 of the precast cap 20. Subsequently, ductile concrete is poured through the grouting hole 230 into the space above the top of the support plate 120. This kind of concrete has excellent fluidity and self-compacting property, and can fully fill and compact the space to form a core-filled concrete structure 140. At the same time, during the pouring process, part of the concrete will enter the tubular pouring space through the grouting channel 240 to further strengthen the connection between the precast pipe pile 10 and the precast cap 20. The formation of the core-filled concrete structure 140 significantly improves the bearing capacity of the precast pipe pile 10. The low elastic modulus, high ductility and durability of the ductile concrete make the pile foundation more stable and reliable when bearing external loads. At the same time, the setting of the support plate 120 and the anchor reinforcement bars 130 also enhances the integrity and stability of the structure.

[0038] Furthermore, the grouting hole 230 includes an equal-diameter hole section 231 from top to bottom and a tapered hole section 232 with a gradually increasing aperture. The aperture at the top of the tapered hole section 232 is equal to the aperture of the equal-diameter hole section 231, and the aperture at the bottom of the tapered hole section 232 is equal to the inner diameter of the pipe pile body 110.

[0039] Specifically, the equal-diameter hole section 231 at the upper part of the filling hole 230 has a consistent hole diameter, which is conducive to the smooth access and positioning of filling equipment (such as a concrete pump or a filling pipe), and reduces the filling resistance and instability caused by the change of the hole diameter. The design of the tapered hole section 232 enables the hole diameter to gradually increase from the smaller value of the equal-diameter hole section 231 to the inner diameter of the pipe pile body 110. This transitional design helps the concrete to flow smoothly during the filling process, reduces the vortex or concrete blockage phenomenon caused by the sudden change of the hole diameter, thereby improving the filling efficiency. At the same time, the design of the tapered hole section 232 enables the concrete to gradually adapt to the change of the hole diameter during the filling process, reduces the bubbles and voids caused by the sudden change of the flow rate, and improves the density and uniformity of the concrete.

[0040] Further, the number of the precast bearing platforms 20 in the transverse bridge direction is two, and the two precast bearing platforms 20 are connected by a precast tie beam 40. The precast tie beam 40 and the precast bearing platform 20 are connected by a post-cast joint 410.

[0041] As a preferred embodiment, a plurality of positive U-shaped steel bars 250 surrounding the pier column socket 210 are embedded in the precast bearing platform 20. Each positive U-shaped steel bar 250 includes a transverse steel bar section 251 disposed at the bottom of the pier column socket 210 and two side limb sections 252 respectively disposed on both sides of the pier column socket 210. Wherein, each side limb section 252 extends upward from the transverse steel bar section 251 and extends out of the top of the precast bearing platform 20.

[0042] Specifically, as Figure 1 shown, each positive U-shaped steel bar 250 includes a transverse steel bar section 251 and two side limb sections 252. The transverse steel bar section 251 is disposed at the bottom of the pier column socket 210 and is embedded in the precast bearing platform 20, playing a role of connection and support. The two side limb sections 252 are respectively disposed on both sides of the pier column socket 210, extend upward from the transverse steel bar section 251, and extend out of the top of the precast bearing platform 20. After the side limb section 252 extends out of the top of the precast bearing platform 20, it can be lapped or spot-welded with the corresponding longitudinal main steel bar 510 of the pier column. The positive U-shaped steel bar 250 can play a dual role of connection and punching shear resistance. The positive U-shaped steel bar 250 and the longitudinal main steel bar 510 of the pier column do not need to correspond one by one, and only need to be axially aligned. The installation tolerance is large and the force is reliable.

[0043] This connection method enables the positive U-shaped steel bar 250 and the longitudinal main steel bar 510 of the pier column to be lapped or spot-welded in the normal state or during small earthquakes, enhancing the seismic resistance. During large or strong earthquakes, the lap or spot-weld between the side limb section 252 and the longitudinal main steel bar 510 of the pier column fails (i.e., the side limb section 252 and the longitudinal main steel bar 510 are staggered or disconnected), thereby reducing the seismic resistance of this part of the area.

[0044] Furthermore, each of the side limb segments 252 includes a side limb extending segment 2521, a vertical steel bar joint 2523 embedded in the precast bearing platform 20, and a side limb embedded segment 2522. The side limb embedded segment 2522 is connected to the vertical steel bar joint 2523 and extends downward to be connected to the transverse steel bar segment 251. The side limb extending segment 2521 is detachably connected to the vertical steel bar joint 2523 and extends upward beyond the precast bearing platform 20.

[0045] In this embodiment, through the detachable connection method, if the post-cast joint 410 and the internal side limb extending segment 2521 are damaged or deformed too much under the action of external forces such as earthquakes, the post-cast joint 410 can be chiseled off, the side limb extending segment 2521 can be removed, a side limb extending segment 2521 that meets the requirements can be reinstalled, and then the post-cast joint 410 can be re-poured, so as to realize the replacement and repair process.

[0046] Furthermore, multiple positive U-shaped steel bars 250 are arranged at equal intervals around the pier column socket 210. Specifically, the equal-interval arrangement ensures that the positive U-shaped steel bars 250 form uniform support around the pier column socket 210, avoiding local stress concentration and further enhancing the bearing capacity of the structure. In other embodiments, the arrangement of multiple inverted U-shaped steel bars can also be set according to actual needs.

[0047] Furthermore, the supporting plate 120 and the anchoring steel bars 130 are welded.

[0048] Furthermore, the transverse steel bar segment 251 and the side limb segment 252 are integrally formed.

[0049] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A prefabricated and assembled bridge foundation, characterized in that, It includes a prefabricated pipe pile and a prefabricated cap connected to the top of the prefabricated pipe pile, wherein: The top of the precast cap is recessed downwardly to provide a pier socket for docking with the pier, the bottom of the precast cap is recessed upwardly to provide a pile foundation socket for docking with the precast pipe pile, the top of the precast cap is provided with a grouting hole connected with the pile foundation socket, the aperture of the grouting hole is smaller than the aperture of the pile foundation socket, the top of the precast pipe pile is inserted into the pile foundation socket, and a tubular casting space is formed between the pile foundation socket and the precast pipe pile, the bottom of the precast cap is pre-buried with a grouting channel connecting the grouting hole and the tubular casting space, ductile concrete is poured into the interior of the precast pipe pile and the grouting hole through the grouting hole, and ductile concrete is also poured into the tubular casting space through the grouting channel to form a tubular structural layer.

2. The prefabricated and assembled bridge foundation according to claim 1, characterized in that, The prefabricated pipe pile includes a pipe pile body, a support plate and anchoring steel bars, wherein the support plate is sealingly connected to the inner wall of the pipe pile body, one end of the anchoring steel bar is connected to the top of the support plate, and the other end extends upward and is flush with the top of the pouring hole; wherein ductile concrete is poured through the pouring hole into the space above the top of the support plate to form a core-filled concrete structure.

3. The prefabricated and assembled bridge foundation according to claim 1, wherein, A plurality of regular U-shaped steel bars surrounding the pier socket are embedded in the prefabricated cap, and each of the regular U-shaped steel bars includes a transverse steel bar segment arranged at the bottom of the pier socket and two side limb segments respectively arranged on both sides of the pier socket, wherein each of the side limb segments extends upward from the transverse steel bar segment and extends out of the top of the prefabricated cap.

4. The prefabricated and assembled bridge foundation according to claim 2, wherein, The filling hole includes a hole section of equal diameter from top to bottom and a gradual hole section with gradually increasing hole diameter, the top hole diameter of the gradual hole section is equal to the hole diameter of the equal diameter hole section, and the bottom hole diameter of the gradual hole section is equal to the inner diameter of the pipe pile body.

5. The prefabricated and assembled bridge foundation according to claim 3, wherein, Each of the side limb segments includes a side limb extension segment and a vertical steel bar joint and a side limb embedded segment embedded in the prefabricated foundation. The side limb embedded segment is connected to the vertical steel bar joint and extends downward to be connected to the transverse steel bar segment. The side limb extension segment is detachably connected to the vertical steel bar joint and extends upward to the outside of the prefabricated foundation.

6. The prefabricated and assembled bridge foundation according to claim 3, characterized in that, A plurality of the positive U-shaped steel bars are evenly spaced and arranged around the socket hole of the pier column.

7. The prefabricated and assembled bridge foundation according to claim 1, wherein The number of the precast caps along the transverse direction of the bridge is two, the two precast caps are connected by a precast tie beam, and the precast tie beam and the precast caps are connected by a post-cast joint.

8. The prefabricated and assembled bridge foundation according to claim 2, characterized in that, The support plate and the anchoring steel bar are welded.

9. The prefabricated and assembled bridge foundation according to claim 3, characterized in that, The transverse reinforcement section and the side limb section are integrally formed.

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