A post-cast concrete connection structure between a prefabricated top cap and a pier column and a construction method thereof

Abstract

The present invention provides a post-cast concrete connection structure between a prefabricated top cap and a pier column and a construction method. The connection structure includes a foundation, a prefabricated pier column and a prefabricated top cap. The foundation and the prefabricated pier column are assembled. The prefabricated pier column has two lateral bars arranged symmetrically with the center line of the foundation. The prefabricated pier column is provided with a pier column main reinforcement inside, and a connecting plate is provided above the prefabricated pier column. The lateral length of the prefabricated top cap is 20-30cm larger than the side of the clear distance between the prefabricated pier columns, so as to ensure that it can be temporarily supported on the prefabricated pier column during assembly; the longitudinal width of the prefabricated top cap is 5cm smaller than the side of the clear distance on the inner side of the connecting plate, so as to ensure that it can be installed on the inner side of the connecting plate during assembly. Transverse connecting steel bars and longitudinal connecting steel bars extend from the end faces on both sides of the prefabricated top cap. Post-cast concrete is poured at the connection between the prefabricated top cap and the prefabricated pier column to complete the assembly. The prefabricated top cap of the connection structure is light in weight, has fewer assembly processes, is less difficult to construct, has good quality and is low in cost.

Description

Technical Field

[0001] The invention relates to the field of bridge construction, and in particular to a post-cast concrete connection structure between a prefabricated top cap and a pier column and a construction method. Background Art

[0002] Prefabricated structures have the advantages of small construction interference, fast construction speed, and meeting green construction requirements. They are used in some municipal and highway projects. In recent years, they have begun to be studied and applied in domestic railway and urban rail transit projects.

[0003] In railway and urban rail transit structures, the bridge deck is generally narrow, and the pier structure has a small transverse width. When the prefabricated pier adopts a frame structure, it is composed of a prefabricated top cap and two prefabricated piers. The prefabricated top cap and piers are both reinforced concrete structures. The prefabricated top cap is often large in size and heavy in weight due to the influence of the upper support structure, which increases the difficulty of lifting. When assembling the prefabricated top cap and the prefabricated pier, sleeve grouting or corrugated pipe connection is generally used. When connecting, the steel bar joints need to be inserted into the sleeve grouting or corrugated pipe one by one, and then grouting is performed one by one, which requires high precision and many construction processes. The prefabricated top cap and the two prefabricated piers are connected at the same time, which is difficult to control the construction; the cost is often high. Therefore, it is an urgent problem to develop a post-cast concrete connection structure and construction method between the prefabricated top cap and the pier. Summary of the invention

[0004] In view of this, the present invention aims to propose a post-cast concrete connection structure between a prefabricated top cap and a pier column and a construction method, which has low cost, fewer processes and convenient construction.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A post-cast concrete connection structure between a prefabricated top cap and a pier column comprises a prefabricated pier column and a prefabricated top cap, wherein main reinforcement of the pier column is arranged inside the prefabricated pier column, a connecting plate is arranged on the top of the prefabricated pier column, transverse connecting steel bars and longitudinal connecting steel bars extend from the end surfaces of both sides of the prefabricated top cap, and post-cast concrete is poured at the connection between the prefabricated top cap and the prefabricated pier column to complete the assembly.

[0007] Furthermore, the structure also includes a foundation, which is assembled with prefabricated piers. There are two prefabricated piers in the transverse direction, which are arranged symmetrically with respect to the center line of the foundation.

[0008] Furthermore, stirrups are tied to the main reinforcement of the pier column. The main reinforcement of the pier column is necked at the top of the prefabricated pier column. The stirrups gradually change with the main reinforcement of the pier column in the necked part. The main reinforcement of the pier column extends out of the top of the prefabricated pier column by a certain length, and the extended part is located inside the connecting plate.

[0009] Furthermore, the transverse connecting steel bars are arranged in layers along the height direction of the prefabricated top cap, and the number of layers is increased in the top area of ​​the prefabricated top cap to ensure local pressure bearing at the upper support; they are arranged in the gaps between the main reinforcements of the piers to be connected along the prefabricated top cap to ensure mutual penetration during assembly; the longitudinal connecting steel bars are tied to the transverse connecting steel bars to form a mesh structure, and are arranged in the gaps between the main reinforcements of the piers to be connected to ensure mutual penetration during assembly; the crossbeam connecting steel bars and the longitudinal connecting steel bars ensure the longitudinal and transverse forces at the nodes of the prefabricated piers and the prefabricated top caps.

[0010] Furthermore, the two side end faces of the prefabricated top cap are convex to ensure the vertical shear resistance and contact surface connection strength between the post-cast concrete. The transverse length of the prefabricated top cap is 20-30cm larger than the clear distance between the prefabricated piers, ensuring that it can be temporarily supported on the prefabricated piers during assembly; the longitudinal width of the prefabricated top cap is 5cm smaller than the clear distance on the inner side of the connecting plate, ensuring that it can be installed on the inner side of the connecting plate during assembly.

[0011] Furthermore, the connecting plate is composed of three plates, which are connected to the prefabricated pier at the bottom and are prefabricated together with the prefabricated pier. The connecting plate is an open structure in the transverse direction, and the top surface is flush with the top of the prefabricated top cap.

[0012] Furthermore, shear steel bars are provided inside the main reinforcement of the pier column. The shear steel bars are embedded in the prefabricated pier column, with the upper part extending out of the prefabricated pier column for a certain length, and are arranged in the gap between the transverse connecting steel bars and the longitudinal connecting steel bars of the prefabricated top cap, so as to provide shear resistance between the post-cast concrete and the prefabricated pier column.

[0013] Furthermore, the post-cast concrete is poured in a closed area surrounded by the prefabricated top cap, prefabricated piers, and connecting plates, and the top is flush with the prefabricated top cap; during pouring, there is no need to set up temporary formwork around it, and shrinkage-compensating high-strength concrete is used to pour and vibrate from the top surface, which makes it easy to ensure construction quality.

[0014] Furthermore, a support block is provided at the contact portion where the prefabricated top cap and the prefabricated pier are assembled, and the support block is made of elastic material to ensure the linear shape during assembly.

[0015] Furthermore, a sealing seam is used to fill the gap between the prefabricated top cap and the connecting plate to ensure that there is no leakage during the pouring of the post-cast concrete.

[0016] Furthermore, the inner side of the connection plate and the top surface of the prefabricated pier are roughened to enhance the connection with the post-cast concrete.

[0017] A construction method using the above-mentioned post-cast concrete connection structure between the prefabricated top cap and the pier column comprises the following steps:

[0018] Step 1: Foundation construction, prefabricated piers and prefabricated top caps are manufactured.

[0019] Step 2: After the two prefabricated piers and foundation are assembled, the prefabricated top cap is hoisted.

[0020] Step 3: Install the support blocks on the prefabricated piers, assemble the prefabricated top caps, and insert the main reinforcement and shear reinforcement of the piers into the gaps between the transverse connecting reinforcement and the longitudinal connecting reinforcement on the prefabricated top caps.

[0021] Step 4: Install the sealing joint, pour concrete from the top surface, and maintain.

[0022] Compared with the prior art, the post-cast concrete connection structure between the prefabricated top cap and the pier column and the construction method described in the present invention have the following advantages:

[0023] 1. Post-cast concrete is set in the connection area between the prefabricated top cap and the prefabricated pier, which greatly reduces the weight of the prefabricated top cap and reduces the weight of transportation and lifting.

[0024] 2. The post-poured concrete is poured in one time, without the need for grouting one by one when the steel bars are connected. The structure itself is used as a template during pouring, and there is no need to set up additional templates. There are fewer processes and the construction is convenient.

[0025] 3. The construction tolerance is large when assembling the prefabricated top cap and the prefabricated pier column, and the reserved steel bar gap is large, which is convenient for mutual penetration, reducing the difficulty of assembling the prefabricated top cap with two pier columns at the same time.

[0026] 4. The connection between the prefabricated top cap and the prefabricated pier is reliable, the construction quality of the connection position is easy to ensure, no special materials are needed, and the cost is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is the front view of the present invention;

[0029] Figure 2 yes Figure 1 Ⅰ-Ⅰ sectional view;

[0030] Figure 3 It is a schematic diagram of the prefabricated pier structure in the present invention;

[0031] Figure 4 yes Figure 3 Ⅱ-Ⅱ sectional view;

[0032] Figure 5 It is a schematic diagram of the prefabricated top cap structure in the present invention;

[0033] Figure 6 yes Figure 5 Ⅲ-Ⅲ cross-sectional view.

[0034] Description of reference numerals:

[0035] 1. Foundation; 2. Precast pier column; 21. Connection plate; 3. Precast top cap; 4. Support block; 5. Post-cast concrete; 61. Transverse connecting steel bars; 62. Longitudinal connecting steel bars; 71. Pier column main reinforcement; 72. Pier column stirrups; 73. Shear reinforcement; 8. Sealing joint. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] like Figure 1-6As shown, a post-cast concrete connection structure between a prefabricated top cap and a pier column comprises a foundation 1, a prefabricated pier column 2 and a prefabricated top cap 3. The foundation 1 is assembled with the prefabricated pier column 2. The prefabricated pier column 2 has two lateral piers 71 arranged symmetrically with the center line of the foundation 1. A pier column main reinforcement 71 is arranged inside the prefabricated pier column 2, and a connecting plate 21 is arranged on the top of the prefabricated pier column 2. The end faces of both sides of the prefabricated top cap 3 are convex to ensure the vertical shear resistance and contact surface connection strength between the post-cast concrete. The lateral length of the prefabricated top cap 3 is 20-30cm larger than the clear distance side of the prefabricated pier column 2, so as to ensure that it can be temporarily supported on the prefabricated pier column during assembly; the longitudinal width of the prefabricated top cap 3 is 5cm smaller than the clear distance side of the inner side of the connecting plate 21, so as to ensure that it can be installed on the inner side of the connecting plate 21 during assembly. Transverse connecting steel bars 61 and longitudinal connecting steel bars 62 extend from the end faces of both sides of the prefabricated top cap 3, and post-cast concrete 5 is poured at the connection between the prefabricated top cap 3 and the prefabricated pier 2 to complete the assembly. A support block 4 is provided at the contact portion where the prefabricated top cap 3 and the prefabricated pier 2 are assembled. The support block 4 is made of elastic material to ensure the linear shape during assembly. The gap between the prefabricated top cap 3 and the connecting plate 21 is filled with a sealing seam 8 to ensure that there is no leakage when the post-cast concrete is poured. The inner side of the connecting plate 21 and the top surface of the prefabricated pier 2 are roughened to enhance the connection with the post-cast concrete.

[0041] Stirrups 72 are tied to the main reinforcement 71 of the pier column. The main reinforcement 71 of the pier column is arranged in a necked-down manner at the top of the prefabricated pier column 2. The stirrups 72 gradually change with the main reinforcement 71 of the pier column at the necked-down portion. The main reinforcement 71 of the pier column extends out of the top of the prefabricated pier column 2 by a certain length, and the extended portion is located inside the connecting plate 21. Shear steel bars 73 are arranged inside the main reinforcement 71 of the pier column. The shear steel bars 73 are pre-embedded in the prefabricated pier column 2, and the upper part extends out of the prefabricated pier column 2 by a certain length, and are arranged in the gap between the transverse connecting steel bars 61 and the longitudinal connecting steel bars 62 of the prefabricated top cap 3 to provide shear resistance between the post-cast concrete and the prefabricated pier column. The transverse connecting steel bars 61 are arranged in layers along the height direction of the prefabricated top cap 3, and the number of layers is increased in the top area of ​​the prefabricated top cap 3 to ensure local pressure bearing at the upper support; they are arranged in the gaps between the main reinforcements 71 of the piers to be connected along the prefabricated top cap 3 to ensure mutual penetration during assembly; the longitudinal connecting steel bars 62 are tied to the transverse connecting steel bars 61 to form a mesh structure, and are arranged in the gaps between the main reinforcements 71 of the piers to be connected to ensure mutual penetration during assembly; the crossbeam connecting steel bars and the longitudinal connecting steel bars ensure the longitudinal and transverse forces at the nodes of the prefabricated piers and the prefabricated top caps.

[0042] The connecting plate 21 is composed of three plates, which are connected to the prefabricated pier column 2 at the bottom and are prefabricated together with the prefabricated pier column 2. The structure is open in the horizontal direction, and the top surface is flush with the top of the prefabricated top cap 3. The post-cast concrete 5 is poured in the closed area surrounded by the prefabricated top cap 3, the prefabricated pier column 2, and the connecting plate 21, and the top is flush with the prefabricated top cap 3. During pouring, no temporary formwork is required around, and shrinkage-compensating high-strength concrete is used. The pouring and vibration are performed from the top surface, which is easy to ensure the construction quality.

[0043] The construction method of the post-cast concrete connection structure between the prefabricated top cap and the pier column comprises the following steps:

[0044] Step 1: The foundation 1 is constructed, and the prefabricated pier 2 and the prefabricated top cap 3 are manufactured.

[0045] Step 2: After the two prefabricated piers 2 and the foundation 1 are assembled, the prefabricated top cap 3 is hoisted.

[0046] Step 3: Install the support block 4 on the prefabricated pier column 2, assemble the prefabricated top cap 3, and insert the pier column main reinforcement 71 and the shear reinforcement 73 into the gap between the transverse connecting reinforcement 61 and the longitudinal connecting reinforcement 62 on the prefabricated top cap 3.

[0047] Step 4: Install the sealing joint 8, pour the post-pour concrete 5 from the top surface, and maintain.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A post-cast concrete connection structure between a prefabricated top cap and a pier column, characterized in that: It comprises a prefabricated pier column and a prefabricated top cap, wherein the prefabricated pier column is provided with a main reinforcement of the pier column, a connecting plate is provided on the top of the prefabricated pier column, transverse connecting steel bars and longitudinal connecting steel bars extend from the end faces of both sides of the prefabricated top cap, and post-cast concrete is poured at the connection between the prefabricated top cap and the prefabricated pier column to complete the assembly; The connecting plate is composed of three plates, which are connected to the prefabricated pier column at the bottom and are prefabricated together with the prefabricated pier column. The connecting plate is an open structure in the horizontal direction, and the top surface is flush with the top of the prefabricated top cap; Shear steel bars are arranged inside the main reinforcement of the pier column. The shear steel bars are embedded in the prefabricated pier column, the upper part of which extends out of the prefabricated pier column and is arranged in the gap between the transverse connecting steel bars and the longitudinal connecting steel bars of the prefabricated top cap.

2. The post-cast concrete connection structure between the prefabricated top cap and the pier column according to claim 1, characterized in that: The structure also includes a foundation, on which two prefabricated piers are arranged symmetrically with respect to the center line of the foundation, and the foundation is assembled and connected with the prefabricated piers.

3. A post-cast concrete connection structure between a prefabricated top cap and a pier column according to claim 1 or 2, characterized in that: Stirrups are tied to the main reinforcement of the pier column. The main reinforcement of the pier column is necked at the top of the prefabricated pier column. The stirrups gradually change with the main reinforcement of the pier column at the necked part. The main reinforcement of the pier column extends out from the top of the prefabricated pier column, and the extended part is located inside the connecting plate.

4. The post-cast concrete connection structure between the prefabricated top cap and the pier column according to claim 3, characterized in that: The transverse connecting steel bars are arranged in layers along the height direction of the prefabricated top cap and arranged in the gaps between the main bars of the piers to be connected along the prefabricated top cap; the longitudinal connecting steel bars are tied to the transverse connecting steel bars to form a mesh structure and arranged in the gaps between the main bars of the piers to be connected.

5. The post-cast concrete connection structure between the prefabricated top cap and the pier column according to claim 1, characterized in that: The end faces of both sides of the prefabricated top cap are convex, the transverse length of the prefabricated top cap is 20-30 cm larger than the side of the clear distance between the prefabricated piers, and the longitudinal width of the prefabricated top cap is 5 cm smaller than the side of the clear distance inside the connecting plate.

6. The post-cast concrete connection structure between a prefabricated top cap and a pier column according to claim 1, characterized in that: The post-cast concrete is poured in a closed area surrounded by the prefabricated top cap, prefabricated piers and connecting plates, and the top is flush with the prefabricated top cap.

7. The post-cast concrete connection structure between the prefabricated top cap and the pier column according to claim 4, characterized in that: A support block is provided at the assembly point of the prefabricated top cap and the prefabricated pier column. The support block is made of elastic material and is filled in the gap between the prefabricated top cap and the connecting plate through a sealing seam.

8. A construction method using the post-cast concrete connection structure between the prefabricated top cap and the pier column according to any one of claims 2 to 7, characterized in that: The following steps are involved: Step 1: Foundation construction, prefabricated piers and prefabricated top caps are manufactured; Step 2: After the two prefabricated piers and foundation are assembled, the prefabricated top cap is hoisted; Step 3: Install the support blocks on the prefabricated pier column, assemble the prefabricated top cap, and insert the main reinforcement and shear reinforcement of the pier column into the gap between the transverse connecting reinforcement and the longitudinal connecting reinforcement on the prefabricated top cap; Step 4: Install the sealing joint, pour concrete from the top surface, and maintain.

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