UHPC (Ultra High Performance Concrete) connection assembly type reinforced concrete column

Abstract

The utility model provides a UHPC (Ultra High Performance Concrete) connection assembly type reinforced concrete column, which comprises at least two layers of prefabricated column bodies, each prefabricated column body comprises a columnar reinforcement cage and concrete, the columnar reinforcement cage is formed by enclosing longitudinal bars and stirrups, the concrete is poured on the reinforcement cage, and cavities for post-pouring concrete are reserved at the upper part and the lower part of each prefabricated column body; longitudinal bars and stirrups are reserved in the area, so that the steel bars of the upper-layer prefabricated column body and the lower-layer prefabricated column body and the post-poured concrete in the cavity form a firm whole; the upper formwork, the sleeve and the columnar cavity of the prefabricated column body are all formed by pouring UHPC, and the poured UHPC forms a tenon structure at the joint, so that the joint of the column is not weak any more, and the anti-seismic property of the joint is enhanced; and the vibrating rod can be directly inserted into the cavity at the joint through the pre-embedded sleeve to vibrate the concrete, so that the on-site pouring quality is fully ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of construction, and in particular to a UHPC-connected assembled reinforced concrete column. Background Art

[0002] Prefabricated buildings have the advantages of simple structure, efficient construction, energy saving and environmental protection, and have been widely used. Prefabricated reinforced concrete columns are mostly connected by grouting sleeves, grout anchor overlap and other methods, but these methods have high requirements for construction accuracy, narrow grouting channels, and cannot guarantee the quality of grouting. In addition, there are weak positions in the structure at the connection. Compared with cast-in-place structures, they lack integrity. In extreme cases such as earthquakes and typhoons, the joints are prone to cracking, resulting in a decrease in the bearing capacity and deformation capacity of the structure. Post-casting concrete at the connection at the assembly site can improve the integrity of the structure, but the cumbersome processes of supporting and removing the formwork have caused a waste of manpower and financial resources. Utility Model Content

[0003] In view of this, the purpose of the present invention is to provide a UHPC-connected assembled reinforced concrete column to solve the above problems.

[0004] The utility model adopts the following scheme:

[0005] The present application provides a UHPC-connected assembled reinforced concrete column, comprising at least two layers of prefabricated columns, wherein the prefabricated columns include a columnar steel cage surrounded by longitudinal bars and stirrups, and concrete cast on the steel cage; a sleeve is pre-buried in the middle of the prefabricated column, a columnar cavity with an inner diameter larger than that of the sleeve is arranged at the lower part below the sleeve, and a formwork is arranged at the upper part above the sleeve; an uncast steel cage section is reserved in the formwork, the lower end of the longitudinal bar extends downward from the lower end face of the prefabricated column, and is bent at a small angle to form an overlap section, so as to overlap with the longitudinal bar of the steel cage section of another prefabricated column; ultra-high performance concrete is cast in the formwork, the sleeve and the columnar cavity.

[0006] Furthermore, the formwork is made of ultra-high performance concrete.

[0007] Furthermore, the sleeve is made of PVC material.

[0008] Furthermore, the inner diameter of the columnar cavity is greater than 0.6 times the side length of the cross section of the prefabricated column.

[0009] Furthermore, the depth of the columnar cavity is consistent with the height of the mold shell.

[0010] Furthermore, the height of the formwork is greater than the length of the overlapping section.

[0011] Furthermore, the overlapping section includes a bent portion and a straight section, and the length of the straight section is the same as that of the longitudinal bars in the steel reinforcement cage section.

[0012] By adopting the above technical solution, the following technical effects can be achieved by the utility model:

[0013] 1. By reserving cavities for post-cast concrete at the upper and lower parts of the precast column body and reserving longitudinal bars and stirrups in this area, the steel bars of the upper and lower precast column bodies and the post-cast concrete in the cavities form a firm whole.

[0014] 2. The upper formwork, sleeve and columnar cavity of the precast column body are all cast with UHPC, and the cast UHPC forms a tenon structure at the joint, making the joint of the column no longer weak and enhancing the seismic performance of the joint.

[0015] 3. The vibrating rod can be directly inserted into the cavity at the joint through the embedded sleeve to vibrate the concrete, fully ensuring the casting quality on site. Description of the Drawings

[0016] Figure 1 is a scene application diagram of a UHPC-connected precast reinforced concrete column structure in the front view direction according to an embodiment of the utility model;

[0017] Figure 2 is a schematic structural diagram of a precast column body of a UHPC-connected precast reinforced concrete column structure according to an embodiment of the utility model;

[0018] Figure 3 is a schematic structural diagram of a precast column body of a UHPC-connected precast reinforced concrete column structure in the top view direction according to an embodiment of the utility model;

[0019] Figure 4 is a schematic structural diagram of a precast column body of a UHPC-connected precast reinforced concrete column structure in the bottom view direction according to an embodiment of the utility model.

[0020] Reference Signs: Precast Column Body 1, Formwork 2, Longitudinal Bar 3, Sleeve 4, Columnar Cavity 5, Steel Reinforcement Cage Section 6, Overlapping Section 7. Detailed Embodiment

[0021] Combined with Figures 1 to 4As shown in the figure, this embodiment provides a UHPC-connected precast reinforced concrete column, which includes at least two layers of precast column bodies 1. The precast column body 1 includes a columnar steel reinforcement cage formed by enclosing longitudinal steel bars 3 and stirrups, and concrete poured on the steel reinforcement cage. A casing 4 is embedded in the middle of the precast column body 1. A columnar cavity 5 with an inner diameter larger than that of the casing 4 is arranged below the casing 4, and a formwork 2 is arranged above the casing 4. An uncast steel reinforcement cage section 6 is reserved in the formwork 2. The lower end of the longitudinal steel bar 3 extends downward beyond the lower end face of the precast column body 1 and is bent at a small angle to form a lapped section 7, so as to facilitate the lapping with the longitudinal steel bars of the steel reinforcement cage section 6 of another precast column body 1. Ultra-high performance concrete is poured into the formwork 2, the casing 4 and the columnar cavity 5.

[0022] By leaving cavities for post-cast concrete in the upper and lower formworks 2 of the precast column body 1 and reserving longitudinal steel bars 3 and stirrups in this area, the steel bars of the upper and lower precast column bodies 1 and the post-cast concrete in the cavities form a firm whole. The upper formwork 2, the casing 4 and the columnar cavity 5 of the precast column body 1 are all poured with UHPC. The poured UHPC forms a tenon structure at the joint, making the joint of the column no longer weak and enhancing the seismic performance of the joint. The vibrating rod can be directly inserted into the cavity at the joint through the embedded casing 4 to vibrate the concrete, fully ensuring the pouring quality on site.

[0023] Specifically, in this embodiment, as Figure 2 shown, the precast column body 1 includes a columnar steel reinforcement cage formed by enclosing longitudinal steel bars 3 and stirrups, and concrete poured on the steel reinforcement cage. A casing 4 is embedded in the middle of the precast column body 1, and the casing 4 is made of PVC. A columnar cavity 5 with an inner diameter larger than that of the casing 4 is arranged below the casing 4, and its depth is the same as the height of the formwork 2. A formwork 2 is arranged above the casing 4. The formwork 2 is made of ultra-high performance concrete (UHPC). This kind of concrete has good toughness, high durability and high bond strength. Using it as the material of the formwork 2 can effectively bear the lateral pressure brought by the post-cast concrete and form a firm whole with the lower column body. And when constructing on site, there is no need to set up formwork again, saving a large amount of labor and material costs.

[0024] An uncast steel reinforcement cage section 6 is reserved in the formwork 2. The length of the longitudinal steel bars of the steel reinforcement cage section 6 meets the requirements of the Code for Design of Concrete Structures (GB50010-2010) for the lap length of steel bars. The lower end of the longitudinal steel bar 3 of the precast column body 1 extends downward beyond the lower end face of the precast column body 1 and is bent at a small angle to form a lapped section 7 to avoid the longitudinal steel bars in the steel reinforcement cage section 6 of its lower precast column body 1, and then to carry out lapping. The height of the formwork 2 is greater than the length of the lapped section to avoid exposed longitudinal steel bars 3 after lapping.

[0025] The formwork 2, the casing 4, and ultra-high performance concrete (UHPC) are poured into the columnar cavity 5, so that the longitudinal bars 3 of the upper and lower precast column bodies 1 are reliably anchored in the post-cast UHPC. Moreover, the UHPC penetrates through the joint position of the two precast column bodies 1 to form a tenon structure, avoiding the problem of weak joints, improving the integrity of the upper and lower precast column bodies 1, and endowing the structure with excellent seismic performance.

[0026] Preferably, the inner diameter of the columnar cavity 5 is more than 0.6 times the side length of the cross-section of the precast column body, so as to ensure that the tenon structure formed by the post-cast UHPC can give full play to its role and enhance the integrity of the joint.

[0027] The construction method of the UHPC-connected precast reinforced concrete column structure includes the following steps:

[0028] S1: In the factory prefabrication stage:

[0029] S1.1: Bind the longitudinal bars 3 and stirrups to form the steel cage of the precast column body 1, pass through the embedded casing 4, place the steel cage vertically, set up the formwork and pour the lower precast column body 1, leaving a columnar cavity 5 at the lower part of the precast column body 1;

[0030] S1.2: Set up the formwork of the formwork 2 on the upper part of the precast column body 1, prepare and pour UHPC, and remove all the formwork after the strength reaches the requirement;

[0031] S1.3: Bend the longitudinal bars 3 extending from the bottom of the precast column body 1 to form a lapped section 7;

[0032] S2: In the on-site construction stage:

[0033] S2.1: Lay a layer of mortar cushion on the top surface of the precast column body 1 of the assembled lower layer, hoist the upper precast column body 1 to directly above the lower precast column body 1 and temporarily fix it. Pour UHPC into the cavity of the formwork 2 at the joint through the embedded casing 4 of the upper precast column body 1, and insert a vibrating rod from the embedded casing 4 to vibrate the concrete in the cavity, completing the construction of the UHPC-connected precast reinforced concrete column structure.

[0034] It should be understood that the above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention.

[0035] The introduction of the drawings used in the above embodiments only shows some embodiments of the present invention and should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

Claims

1. A UHPC-connected precast reinforced concrete column, comprising at least two layers of precast column bodies, wherein each precast column body includes a column-shaped steel reinforcement cage formed by surrounding longitudinal bars and stirrups, and concrete cast on the steel reinforcement cage; characterized in that, A casing is embedded in the middle of the precast column body. A columnar cavity with an inner diameter larger than that of the casing is arranged below the casing, and a formwork is arranged above the casing. An uncast steel reinforcement cage section is reserved in the formwork. The lower end of the longitudinal reinforcement extends downward from the lower end face of the precast column body and is bent at a small angle to form a lapping section, so as to facilitate lapping with the longitudinal reinforcement of the steel reinforcement cage section of another precast column body. Ultra-high performance concrete is poured into the formwork, the casing and the columnar cavity.

2. The UHPC-connected precast reinforced concrete column according to claim 1, characterized in that, The formwork is made of ultra-high performance concrete.

3. The UHPC-connected prefabricated reinforced concrete column according to claim 1, wherein The casing is made of PVC material.

4. The UHPC-connected prefabricated reinforced concrete column according to claim 1, wherein, The inner diameter of the columnar cavity is more than 0.6 times the side length of the cross section of the precast column body.

5. The UHPC-connected prefabricated reinforced concrete column according to claim 4, wherein, The depth of the columnar cavity is the same as the height of the formwork.

6. The UHPC-connected prefabricated reinforced concrete column according to claim 1, wherein, The height of the formwork is greater than the length of the lapping section.

7. The UHPC-connected precast reinforced concrete column according to claim 1, characterized in that, The lapping section includes a bent portion and a straight section portion, and the length of the straight section portion is the same as that of the longitudinal reinforcement in the steel reinforcement cage section.

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