A UHPC-based precast concrete frame structure system and its construction method

Abstract

The present invention relates to the field of civil engineering technology, specifically to a UHPC-based precast concrete frame structure system and a construction method thereof, comprising a foundation, wherein the top of the foundation is symmetrically fixed with precast columns, and the interior of the precast columns is hollow; a cantilever beam is fixedly arranged in the middle of the opposite surface of the precast column, and a precast beam is arranged between the two cantilever beams, and the cantilever beam is connected to the precast beam through a UHPC casting area; a connecting beam is commonly arranged at the top of the precast column, a clamping block 1 is fixedly arranged on one side of the bottom end of the connecting beam, and a clamping block 2 is fixedly arranged on the other side of the bottom end of the connecting beam, and both the clamping block 1 and the clamping block 2 are located inside the precast column. The cantilever beam of the present invention is connected to the precast beam through the UHPC casting area, which can not only enhance the strength of the connection surface, but also make the operation easier due to its lightweight structure; by arranging the cantilever beam on the precast column, the degree of damage to the precast column when the precast beam is damaged or broken can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering, and in particular to a UHPC-based precast concrete frame structure system and a construction method thereof. Background Art

[0002] UHPC refers to ultra-high performance concrete, which is a general term for cement-based composite materials with a compressive strength of more than 150MPA, ultra-high toughness and ultra-long durability; the concrete frame structure is composed of load-bearing beams and columns poured with reinforced concrete, hollow bricks or prefabricated aerated concrete, expanded clay and other lightweight panels used as partition walls for household assembly.

[0003] In current concrete frame structures, columns and beams are generally connected by pouring concrete with steel bars. When a part of the structure is damaged, the entire structure is likely to collapse. UHPC, as a high-performance composite material, will lead to excessively high construction costs if it is used entirely or in large quantities in concrete frame structures. Therefore, we have made improvements to this and proposed a prefabricated concrete frame structure system based on UHPC and its construction method. Summary of the invention

[0004] The present invention provides a precast concrete frame structure system based on UHPC, comprising a foundation, wherein precast columns are symmetrically fixedly arranged on the top of the foundation, and the interior of the precast columns is hollow; cantilever beams are fixedly arranged in the middle of opposite surfaces of the precast columns, and a precast beam is arranged between the two cantilever beams, and the cantilever beam is connected to the precast beam through a UHPC casting area; a connecting beam is commonly arranged on the top of the precast columns, a first clamping block is fixedly arranged on one side of the bottom end of the connecting beam, and a second clamping block is fixedly arranged on the other side of the bottom end of the connecting beam, and both the first clamping block and the second clamping block are located inside the precast column.

[0005] As a preferred technical solution of the present invention, the foundation is cast by steel bars and concrete, and a steel pipe is fixedly arranged inside the foundation.

[0006] As a preferred technical solution of the present invention, the top end of the steel pipe extends to the top of the foundation, and a plurality of grouting holes are evenly opened on the surface of the steel pipe located at the top of the foundation.

[0007] As a preferred technical solution of the present invention, a plurality of grouting holes 2 are evenly opened on the surface of the prefabricated column, and the grouting holes 1 are the same as the grouting holes 2.

[0008] As a preferred technical solution of the present invention, the size of the first card block is twice the size of the second card block.

[0009] As a preferred technical solution of the present invention, a bayonet is provided on a side of the cantilever beam facing the prefabricated beam, and a clamping frame is fixedly provided on a side of the prefabricated beam facing the cantilever beam, and the clamping frame matches the bayonet.

[0010] As a preferred technical solution of the present invention, UHPC casting holes are provided on the top surface of the card frame and the top surface of the cantilever beam, and steel bars are fixedly provided inside the prefabricated column.

[0011] As a preferred technical solution of the present invention, the following steps are also included:

[0012] S1: Prefabricated columns, prefabricated beams with cantilever beams, connecting beams and steel pipes are prefabricated in the factory, and grouting holes 1 are opened on the steel pipes, grouting holes 2 are opened on the prefabricated columns, and UHPC pouring holes are opened on the cantilever beams and the card frames on the prefabricated beams;

[0013] S2: pouring the foundation with concrete and steel bars, with a portion of the steel pipe located in the foundation;

[0014] S3: Install the precast columns on the foundation, connect the precast beams in the cantilever beam between the two precast columns, and cast the UHPC through the UHPC casting holes;

[0015] S4: pour concrete into the precast column and fix the connecting beam on the top of the precast column.

[0016] The beneficial effects of the present invention are as follows: the cantilever beam and the prefabricated beam are connected through the UHPC casting area, which can not only enhance the strength of the connection surface, but also make the operation easier due to its lightweight structure.

[0017] By arranging cantilever beams on prefabricated columns, the degree of damage to the prefabricated columns when the prefabricated beams are damaged or broken can be reduced.

[0018] Steel pipes are arranged on the surface of the foundation, which can not only guide the installed prefabricated columns, but also enhance the stability of the prefabricated columns. High-strength tank slurry can be injected into the grouting hole 1 opened on the steel pipe and the grouting hole 2 opened on the prefabricated column to enhance the stability of the prefabricated column structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of a precast concrete frame structure system based on UHPC in the present invention. Figure 1 ;

[0021] Figure 2This is a schematic diagram of the overall structure of a precast concrete frame structure system based on UHPC in the present invention. Figure 2 ;

[0022] Figure 3 This is a partial structural diagram of a precast concrete frame structure system based on UHPC in the present invention. Figure 1 ;

[0023] Figure 4 This is a partial structural diagram of a precast concrete frame structure system based on UHPC in the present invention. Figure 2 ;

[0024] Figure 5 This is a partial structural diagram of a precast concrete frame structure system based on UHPC in the present invention. Figure 3 ;

[0025] Figure 6 It is a flow chart of a construction method of a UHPC-based precast concrete frame structure system of the present invention.

[0026] In the figure: 1. foundation; 2. precast column; 3. cantilever beam; 4. precast beam; 5. connecting beam; 6. clamp block 1; 7. clamp block 2; 8. steel pipe; 9. grouting hole 1; 10. grouting hole 2; 11. clamp; 12. clamp frame; 13. UHPC casting hole; 14. steel bar. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] Example: Figures 1 to 6 As shown, the present invention is a precast concrete frame structure system based on UHPC, including a foundation 1, and precast columns 2 are symmetrically fixedly arranged on the top of the foundation 1, and the interior of the precast columns 2 is hollow, which is convenient for pouring concrete and enhancing the stability of the precast columns 2. A cantilever beam 3 is fixedly provided in the middle of the opposite surface of the precast column 2, and a precast beam 4 is provided between the two cantilever beams 3. The cantilever beam 3 and the precast beam 4 are connected through the UHPC casting area. During the specific construction, it can be divided into two installation situations according to actual needs. The first is to install two symmetrical precast columns 2, and the second is to install three precast columns 2. When two precast columns 2 are installed, the cantilever beams 3 on the precast columns 2 are connected and fixed through the precast beams 4; when three precast columns 2 are installed, the cantilever beams 3 are symmetrically provided on the left and right sides of the precast column 2 located in the middle, and are respectively connected to the precast columns 2 at the left and right ends through the precast beams 4. When connecting, the stability of the connection can be enhanced through the UHPC casting area. Compared with reinforced concrete, UHPC material is lighter, easier to operate, and has good connectivity.

[0029] The top of the prefabricated column 2 is commonly provided with a connecting beam 5, a clamping block 1 6 is fixedly provided on one side of the bottom end of the connecting beam 5, and a clamping block 2 7 is fixedly provided on the other side of the bottom end of the connecting beam 5, and both the clamping block 1 6 and the clamping block 2 7 are located inside the prefabricated column 2. When two prefabricated columns 2 are installed, both sides of the bottom end of the connecting beam 5 are clamping blocks 1 6, and when three prefabricated columns 2 are installed, one side of the bottom end of the connecting beam 5 is clamping block 1 6, and the other side is clamping block 2 7, and the clamping block 2 7 is located in the middle prefabricated column 2. The size of the clamping block 1 6 is twice the size of the clamping block 2 7, and two clamping blocks 2 7 can be set in the prefabricated column 2 at the same time.

[0030] The foundation 1 is made of steel bars 14 and concrete, and a steel pipe 8 is fixedly installed inside the foundation 1. The top of the steel pipe 8 extends to the top of the foundation 1, and a plurality of grouting holes 9 are evenly opened on the surface of the steel pipe 8 located at the top of the foundation 1. A plurality of grouting holes 10 are evenly opened on the surface of the prefabricated column 2, and the grouting holes 19 are the same as the grouting holes 10. The steel pipe 8 can guide the prefabricated column 2 so that multiple prefabricated columns 2 are located on the same horizontal line, and at the same time, the stability of the prefabricated column 2 can be enhanced. When the prefabricated column 2 is sleeved on the surface of the steel pipe 8, high-strength tank slurry can be injected into the grouting hole 9 through the grouting hole 10 to enhance stability. After the grouting is completed, the grouting hole 10 can be sealed by a plugging plug.

[0031] A bayonet 11 is provided on the side of the cantilever beam 3 facing the precast beam 4, and a bayonet frame 12 is fixedly provided on the side of the precast beam 4 facing the cantilever beam 3, and the bayonet frame 12 matches the bayonet 11. UHPC casting holes 13 are provided on the top surface of the bayonet frame 12 and the top surface of the cantilever beam 3, and the bayonet frame 12, the bayonet 11 and the UHPC casting hole 13 belong to the UHPC casting area. Steel bars 14 are fixedly provided inside the precast column 2. When it is necessary to connect the precast beam 4 with the precast column 2, the precast column 2 can be installed first, and then the precast beam 4 can be sent from top to bottom between the two precast columns 2, so that the bayonet frames 12 at both ends of the precast beam 4 match the bayonet 11, and the UHPC material is cast into the bayonet frame 12 and the cantilever beam 3 through the UHPC casting hole 13.

[0032] The following steps are involved:

[0033] S1: prefabricating a prefabricated column 2, a prefabricated beam 4 with a cantilever beam 3, a connecting beam 5 and a steel pipe 8 in a factory, and opening a grouting hole 9 on the steel pipe 8, a grouting hole 10 on the prefabricated column 2, and opening a UHPC pouring hole 13 on the cantilever beam 3 and a clamping frame 12 on the prefabricated beam 4;

[0034] S2: pouring the foundation 1 with concrete and steel bars 14, and making a part of the steel pipe 8 located in the foundation 1;

[0035] S3: Install the prefabricated column 2 on the foundation 1, and make the prefabricated column 2 sleeved on the surface of the steel pipe 8, so that the steel pipe 8 guides and enhances the stability of the prefabricated column 2. After the prefabricated column 2 is sleeved on the surface of the steel pipe 8, high-strength tank slurry can be injected into the grouting hole 1 9 through the grouting hole 2 10 to enhance stability; after the prefabricated column 2 of the first layer is installed, pour concrete into the prefabricated column 2, and then place the prefabricated beam 4 between the two prefabricated columns 2, so that the clamping frame 12 on the prefabricated beam 4 matches the clamping port 11 on the suspension beam 3, and then pour UHPC through the UHPC pouring hole 13;

[0036] S4: The connecting beam 5 is fixedly set on the top of the precast column 2, so that the block 1 6 and the block 2 7 on the connecting beam 5 are located in the precast column 2. This action can be performed after pouring concrete into the precast column 2, so that the concrete is fixed together with the block 1 6 and the block 2 7. When it is necessary to continue to build the second and third floors, the precast columns 2 are continued to be stacked and fixed on the precast columns 2 of the first floor, and the above operations are continued.

[0037] In the description of the present invention, it should be noted that the terms "vertical", "up", "down", "horizontal", etc. indicate orientations or positional relationships based on the orientations 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 a limitation on the present invention.

[0038] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A UHPC-based precast concrete frame structure system, comprising a foundation (1), characterized in that: Precast columns (2) are symmetrically fixedly arranged at the top of the foundation (1), and the interior of the precast columns (2) is hollow; cantilever beams (3) are fixedly arranged in the middle of the opposite surfaces of the precast columns (2), and a precast beam (4) is arranged between the two cantilever beams (3), and the cantilever beam (3) and the precast beam (4) are connected through the UHPC casting area; a connecting beam (5) is commonly arranged at the top of the precast columns (2), a first clamping block (6) is fixedly arranged on one side of the bottom end of the connecting beam (5), and a second clamping block (7) is fixedly arranged on the other side of the bottom end of the connecting beam (5), and both the first clamping block (6) and the second clamping block (7) are located inside the precast column (2); A bayonet (11) is provided on a side of the suspension beam (3) facing the prefabricated beam (4), and a clamping frame (12) is fixedly provided on a side of the prefabricated beam (4) facing the suspension beam (3), and the clamping frame (12) matches the bayonet (11); UHPC casting holes (13) are provided on the top surface of the clamping frame (12) and the top surface of the suspension beam (3), and steel bars (14) are fixedly arranged inside the prefabricated column (2); The foundation (1) is formed by pouring steel bars (14) and concrete, and a steel pipe (8) is fixedly arranged inside the foundation (1); The top end of the steel pipe (8) extends to the top of the foundation (1), and a plurality of grouting holes (9) are evenly formed on the surface of the steel pipe (8) located at the top of the foundation (1); The surface of the prefabricated column (2) is evenly provided with a plurality of grouting holes 2 (10), and the grouting holes 1 (9) are the same as the grouting holes 2 (10); The steel pipe (8) serves as a guide for the prefabricated column (2), so that the plurality of prefabricated columns (2) are located on the same horizontal line, and the stability of the prefabricated column (2) is enhanced. When the prefabricated column (2) is sleeved on the surface of the steel pipe (8), high-strength tank slurry is injected into the grouting hole (9) through the grouting hole (10) to enhance stability. After the grouting is completed, the grouting hole (10) is sealed by a plugging plug.

2. A UHPC-based precast concrete frame structure system according to claim 1, characterized in that: The size of the card block one (6) is twice the size of the card block two (7).

3. A construction method of a precast concrete frame structure system based on UHPC according to claim 2, characterized in that: The following steps are involved: S1: prefabricating a prefabricated column (2), a prefabricated beam (4) provided with a cantilever beam (3), a connecting beam (5), and a steel pipe (8) in a factory, and opening a grouting hole (9) on the steel pipe (8), opening a grouting hole (10) on the prefabricated column (2), and opening a UHPC pouring hole (13) on the cantilever beam (3) and a clamping frame (12) located on the prefabricated beam (4); S2: pouring the foundation (1) using concrete and steel bars (14), and making a part of the steel pipe (8) located inside the foundation (1); S3: installing the precast column (2) on the foundation (1), connecting the precast beam (4) in the cantilever beam (3) between the two precast columns (2), and pouring UHPC through the UHPC pouring hole (13); S4: pouring concrete into the prefabricated column (2), and fixing the connecting beam (5) on the top of the prefabricated column (2).

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