Hollow pier and construction method

Abstract

The invention discloses a hollow pier and a construction method, and relates to the technical field of bridge piers. The hollow pier comprises a bearing platform and a pier column. The pier column is provided with a first prefabricated part and a second prefabricated part which are coaxially arranged, the pier column is fixed to the upper end of the bearing platform, and a middle cast-in-place section is poured between the first prefabricated part and the second prefabricated part. According to the hollow pier and the construction method thereof, the construction period is short, the construction cost is low, and environmental pollution can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge piers, and in particular to a hollow pier and a construction method. Background Art

[0002] Hollow piers are common substructures in bridges, which are used to support the superstructure of the bridge and transfer the load of the superstructure of the bridge to the foundation. As far as the inventors are aware, most hollow piers are cast in situ, with steel bars tied, steel skeletons erected, formwork installed, and concrete poured at the construction site. This method has the problems of long construction period, high construction cost, and environmental pollution.

[0003] Therefore, there is an urgent need to design a technical solution with short construction period, low construction cost and the ability to reduce environmental pollution. Summary of the invention

[0004] The purpose of the present invention is to provide a hollow pier and a construction method to solve the problems existing in the above-mentioned prior art, with a short construction period, low construction cost and the ability to reduce environmental pollution.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a hollow pier, comprising:

[0007] platform;

[0008] The pier column comprises a first prefabricated component and a second prefabricated component arranged coaxially, the pier column is fixed to the upper end of the cap, and an intermediate cast-in-place section is cast between the first prefabricated component and the second prefabricated component.

[0009] Preferably, the first prefabricated component is a prefabricated pier outer shell, and the second prefabricated component is a prefabricated pier inner shell. The prefabricated pier outer shell and the prefabricated pier inner shell are coaxially arranged, and the bottoms of both are fixedly connected to the base.

[0010] Preferably, a socket slot is preset on the support platform, and the bottom of the pier column is fixedly inserted in the socket slot.

[0011] Preferably, the bottom of the pier column is inserted into the socket and fixedly connected with high-strength grouting material.

[0012] Preferably, a plurality of extension portions are respectively provided on the inner side walls of the prefabricated pier shell.

[0013] Preferably, a plurality of extension portions are respectively provided on the outer side walls of the inner shell of the prefabricated pier.

[0014] Preferably, the extension portion is an L-shaped steel, one end of the L-shaped steel is welded and embedded in the steel cage of the prefabricated pier outer shell or the prefabricated pier inner shell, and the other end of the L-shaped steel is cast in the middle cast-in-place section.

[0015] Preferably, core-filling concrete is poured into the inner bottom of the inner shell of the prefabricated pier column, and the height of the core-filling concrete is not less than the height of the high-strength grouting material.

[0016] Preferably, the bending directions of the plurality of L-shaped steels at one end away from the steel cage are different.

[0017] The present invention also provides a hollow pier construction method, comprising the following steps:

[0018] Step 1: Cast and maintain the prefabricated pier column outer shell and the prefabricated pier column inner shell in a prefabrication factory, and then transport the prefabricated pier column outer shell and the prefabricated pier column inner shell to the site;

[0019] Step 2: placing the prefabricated pier column outer shell and the prefabricated pier column inner shell on the cap, and making the L-shaped steels between the prefabricated pier column outer shell and the prefabricated pier column inner shell cross each other;

[0020] Step 3, when the prefabricated pier column outer shell and the prefabricated pier column inner shell are placed at corresponding positions of the socket, an intermediate cast-in-place section is cast between the prefabricated pier column outer shell and the prefabricated pier column inner shell to form a pier column;

[0021] Step 4: pour high-strength grouting material between the pier column and the socket;

[0022] Step 5: pour core-filling concrete at the bottom of the inner shell of the prefabricated pier.

[0023] Compared with the prior art, the present invention has achieved the following technical effects:

[0024] The hollow pier provided by the present invention can realize factory prefabrication and batch production by prefabricating the first prefabricated component and the second prefabricated component in the factory. After the first prefabricated component and the second prefabricated component are transported to the site, it is only necessary to hoist and install the prefabricated component and cast the intermediate cast-in-place section, thereby avoiding the cumbersome processes such as on-site formwork, reinforcement, and demoulding, and the construction cost is low and the construction period is short. During the prefabrication in the factory, the flow construction is adopted, so that the quality of the first prefabricated component and the second prefabricated component is controlled, and there will be no quality accidents. It can also save a large amount of materials such as templates and scaffolds that are needed on site, saving costs; the first prefabricated component and the second prefabricated component are prefabricated in the factory, and there is no need for on-site construction and casting, which reduces the pollution to the surrounding environment during on-site construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic elevation diagram of a hollow pier provided in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of a cap of a hollow pier provided in an embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a prefabricated pier column shell of a hollow pier provided in an embodiment of the present invention;

[0029] Figure 4 A schematic diagram of a prefabricated pier column inner shell of a hollow pier provided in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the overall structure assembly provided by an embodiment of the present invention.

[0031] In the figure: 1-cap; 101-slot; 2-pier; 201-prefabricated pier outer shell; 202-prefabricated pier inner shell; 203-middle cast-in-place section; 3-high-strength grouting material; 4-core filling concrete; 5-L-shaped steel. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The purpose of the present invention is to provide a hollow pier and a construction method to solve the problems existing in the above-mentioned prior art, with a short construction period, low construction cost and the ability to reduce environmental pollution.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The present invention provides a hollow pier, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, it includes a cap 1, a first prefabricated component and a second prefabricated component cast in a factory, the cap 1 is provided with corresponding longitudinal reinforcement and stirrups, and a socket 101 is preset on the upper part of the cap 1; the coaxially arranged first prefabricated component and the second prefabricated component are fixed in the socket 101 at the upper end of the cap 1, and an intermediate cast-in-place section 203 is cast between the first prefabricated component and the second prefabricated component to form a pier 2, a certain length of core-filling concrete 4 is cast in the hollow part in the middle of the pier 2, the pier 2 is connected to the cap 1 as a whole through a high-strength grouting material 3, and the high-strength grouting material 3 is cast in the socket 101 of the cap 1 to ensure the bearing capacity of the connection between the pier 2 and the cap 1.

[0036] In one embodiment, the first prefabricated component is a prefabricated pier column outer shell 201 of a hollow cylindrical structure, and the second prefabricated component is a prefabricated pier column inner shell 202 of a hollow cylindrical structure. The prefabricated pier column outer shell 201 and the prefabricated pier column inner shell 202 are coaxially arranged, and the bottoms are both fixedly connected to the cap 1. The prefabricated pier column outer shell 201 and the prefabricated pier column inner shell 202 are both prefabricated in the factory steel cage, and then concrete is poured on the steel cage. In order to improve the integrity of the pier 2, multiple extensions are respectively provided on the inner wall of the prefabricated pier column outer shell 201 and the outer wall of the prefabricated pier column inner shell 202 in this embodiment. In a specific embodiment, the extension portion is made of L-shaped steel 5, one end of which is welded and embedded in the steel cage of the prefabricated pier outer shell 201 or the prefabricated pier inner shell 202, and then cast together with the prefabricated pier outer shell 201 or the prefabricated pier inner shell 202 in the factory as a prefabricated component, and the other end of the L-shaped steel 5 is cast in the middle cast-in-place section 203.

[0037] like Figure 5 As shown, a hollow pier has been assembled, wherein the pier column 2 and the cap 1 are connected by a socket-and-spigot connection, a high-strength grouting material 3 is poured in the socket 101, and a core-filling concrete 4 is poured in the inner bottom of the prefabricated pier column inner shell 202 to make them one body, and the height of the core-filling concrete 4 is not less than the height of the high-strength grouting material 3. Most of the innovations in the bridge direction known to the inventor are concentrated on the assembly of the upper structure, and there are relatively few innovations for the pier column 2 as the lower structure. The present invention is an innovation for the assembly of the bridge pier, which is an innovation for the assembly of the lower structure, filling the gap in domestic and foreign technologies.

[0038] In order to better improve the integrity of the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202 after being connected, the bending directions of multiple L-shaped steels 5 away from one end of the steel cage are different, so that the L-shaped steels 5 between the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202 cross each other.

[0039] The present invention also provides a hollow pier construction method, comprising the following steps: step 1, casting and curing the prefabricated pier column outer shell 201 and the prefabricated pier column inner shell 202 at the prefabrication site according to the above requirements, and then transporting the prefabricated pier column outer shell 201 and the prefabricated pier column inner shell 202 to the site; step 2, hoisting the prefabricated pier column outer shell 201 and the prefabricated pier column inner shell 202 into the socket 101 of the cap 1 by a crane, and making the prefabricated pier column outer shell 201 and the prefabricated pier column inner shell 202 The L-shaped steels 5 are interlaced between the pier inner shells 202; step three, when the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202 are placed in the corresponding positions of the socket 101, the middle cast-in-place section 203 is poured between the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202 to form the pier 2; step four, high-strength grouting material 3 is poured between the pier 2 and the socket 101; step five, core-filling concrete 4 is poured at the bottom of the prefabricated pier inner shell 202.

[0040] The present invention can realize factory prefabrication and mass production by manufacturing the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202 in the factory. After the components are transported to the site, it is only necessary to hoist and install the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202, and cast the middle cast-in-place section 203. The cumbersome processes such as on-site formwork, reinforcing bars, and demolding are avoided. During factory prefabrication, flow construction is adopted, so that the quality of the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202 can be controlled, and quality accidents will not occur. It can also save a large amount of materials such as templates and scaffoldings that need to be used on site, saving costs. L-shaped steel 5 is extended from the prefabricated pier outer shell 201 and the prefabricated pier inner shell 202, and cast in the middle cast-in-place section 203, which can improve the integrity of the bridge pier. Furthermore, the present invention can greatly reduce site occupation and reduce lifting pressure, and is suitable for scenarios with high requirements for foundation during lifting. At the same time, factory prefabrication makes the project quality easy to control and is less restricted by climate, especially in the renovation and reinforcement of old bridges on busy traffic sections, which can significantly reduce the impact on traffic.

[0041] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hollow pier, characterized in that: include: platform; The pier column comprises a first prefabricated component and a second prefabricated component arranged coaxially, the pier column is fixed to the upper end of the cap, and an intermediate cast-in-place section is cast between the first prefabricated component and the second prefabricated component.

2. The hollow pier according to claim 1, characterized in that: The first prefabricated component is a prefabricated pier column outer shell, and the second prefabricated component is a prefabricated pier column inner shell. The prefabricated pier column outer shell and the prefabricated pier column inner shell are coaxially arranged, and the bottoms of both are fixedly connected to the base.

3. The hollow pier according to claim 2, characterized in that: The support platform is provided with a socket slot in advance, and the bottom of the pier column is fixedly inserted in the socket slot.

4. The hollow pier according to claim 3, characterized in that: The bottom of the pier column is inserted into the socket and fixedly connected with high-strength grouting material.

5. The hollow pier according to claim 2, characterized in that: A plurality of extension parts are respectively arranged on the inner side walls of the prefabricated pier shell.

6. The hollow pier according to claim 2, characterized in that: A plurality of extension parts are respectively arranged on the outer side walls of the inner shell of the prefabricated pier.

7. The hollow pier according to claim 5 or 6, characterized in that: The extension portion is an L-shaped steel, one end of which is welded and embedded in the steel cage of the prefabricated pier outer shell or the prefabricated pier inner shell, and the other end of the L-shaped steel is cast in the middle cast-in-place section.

8. The hollow pier according to claim 4, characterized in that: The inner bottom of the prefabricated pier column inner shell is poured with core-filling concrete, and the height of the core-filling concrete is not less than the height of the high-strength grouting material.

9. The hollow pier according to claim 7, characterized in that: The bending directions of the multiple L-shaped steels away from one end of the steel cage are different.

10. A hollow pier construction method, characterized in that: The steps include: Step 1: Cast and maintain the prefabricated pier column outer shell and the prefabricated pier column inner shell in a prefabrication factory, and then transport the prefabricated pier column outer shell and the prefabricated pier column inner shell to the site; Step 2: placing the prefabricated pier column outer shell and the prefabricated pier column inner shell on the cap, and making the L-shaped steels between the prefabricated pier column outer shell and the prefabricated pier column inner shell cross each other; Step 3, when the prefabricated pier column outer shell and the prefabricated pier column inner shell are placed at corresponding positions of the socket, an intermediate cast-in-place section is cast between the prefabricated pier column outer shell and the prefabricated pier column inner shell to form a pier column; Step 4: pour high-strength grouting material between the pier column and the socket; Step 5: pour core-filling concrete at the bottom of the inner shell of the prefabricated pier.

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