A UHPC formwork construction process for prefabricated concrete SW columns

Abstract

A UHPC formwork construction process for prefabricated concrete SW columns includes the following steps: S1-prefabricating a steel cage; S2-casting a bottom formwork on a casting mold platform by side-touching; S3-placing the steel cage on the bottom formwork before the bottom formwork is initially set; S4-arranging angle steels at the four corners of the steel cage, and respectively arranging fine mesh steel wire meshes on both sides and the top surface of the steel cage; S5-making a side formwork and a top formwork integrated with the bottom formwork by applying on the fine mesh steel wire mesh; S6-demolding to obtain an integrated UHPC formwork column; S7-labeling the UHPC formwork column, stacking, packaging and protecting it, and inspecting the product quality; S8-transporting it from the factory to the construction site for assembly construction. Compared with the prior art, the finished product of the present invention is integrally formed, which completely avoids the problem of difficulty in sealing the joints, and strengthens the integrity of the structure by angle steel, so that the finished component is not easily damaged during hoisting, transportation and installation.

Description

Technical Field

[0001] The invention relates to the technical field of assembled building engineering, and in particular to a UHPC formwork construction process for assembled concrete prefabricated SW columns. Background Art

[0002] Prefabricated reinforced concrete structural system has the advantages of high efficiency, economy and environmental protection, and is widely used in the construction of industrial and civil buildings. SW, or Sandwich structure, refers to a prefabricated concrete composite plate component composed of concrete and steel bars as a formwork that does not need to be disassembled, and then installed on site and poured with concrete at one time. Prefabricated SW structure is a prefabricated concrete structure obtained by stacking different materials in stages. The main products include prefabricated SW columns, prefabricated SW floor slabs, prefabricated SW beams and other structural components. The prefabricated cavity UHPC column shell of the prefabricated concrete prefabricated SW column is made of lightweight and high-strength UHPC material, which makes the prefabricated SW column have technical advantages such as light weight for lifting and transportation, high structural integrity, fast and convenient construction, and formwork-free installation. After the cavity prefabricated SW column is installed on site, ordinary concrete is cast inside, the beam-column and beam-slab connection has high integrity, and the node performance is consistent with the cast-in-place concrete structure. Therefore, the prefabricated concrete prefabricated SW column is a prefabricated concrete prefabricated column product with strong market competitiveness.

[0003] UHPC, or ultra-high performance concrete, is a cement-based concrete material that has many advantages, including energy conservation and environmental protection, light weight and high strength, good fluidity, easy construction, and excellent durability. UHPC materials are very suitable for building components or building structures in civil engineering that have high durability requirements, high lifting and transportation requirements, high low-carbon energy conservation and environmental protection requirements, and high construction period requirements. Therefore, UHPC is very suitable as a prefabricated outer layer of prefabricated concrete SW columns. The prefabricated thin-layer formwork material does not need to be disassembled.

[0004] The prefabricated outer layer of the prefabricated concrete SW column needs to meet the basic requirements of being light, thin and sealed, but the closed, light and thin UHPC formwork has great difficulties in prefabrication production. Therefore, the outer layer UHPC formwork of the traditional prefabricated concrete SW column is mostly made of four sides of concrete in four independent times, and then assembled to form a cavity UHPC formwork without disassembly template. However, this process of prefabricating the four sides of the formwork independently and then assembling them has the defects of loose joints and leakage when pouring ordinary concrete later. Moreover, there is no effective connection between the prefabricated formwork column and the internal steel cage, and the structural integrity is not high. Summary of the invention

[0005] Aiming at the defects that the edge joints of the prefabricated UHPC formwork are difficult to seal and the integrity is not high, the present invention provides a UHPC formwork construction process for assembled concrete prefabricated SW columns to improve the traditional construction process and improve the construction quality.

[0006] To achieve the above purpose, the present invention adopts the following technical solution.

[0007] A UHPC formwork construction process for prefabricated concrete SW columns comprises the following steps:

[0008] S1-prefabricated steel cage;

[0009] S2-Set up the side mold on the flat casting mold platform, cast the bottom mold shell with viscous UHPC on the casting mold platform by touching the side, and slightly vibrate and assist with manual smoothing to level the surface;

[0010] S3-Before the bottom formwork is initially set, place the steel cage on the bottom formwork;

[0011] S4-Angle steels are respectively installed at the four corners of the steel cage, and fine mesh steel wire meshes are respectively installed between the angle steels on both sides and the top surface of the steel cage;

[0012] S5-The side and top formworks are made integral with the bottom formwork by applying viscous UHPC on the fine mesh steel wire mesh;

[0013] S6-After the bottom formwork, side formwork and top formwork reach demoulding strength, demoulding construction is performed to obtain an integrated UHPC formwork column;

[0014] S7-labeling, stacking, packaging and protection of UHPC formwork columns, and product qualification inspection;

[0015] S8-Transport from the factory to the construction site for assembly construction.

[0016] Preferably, the bottom formwork, side formwork and top formwork use a viscous UHPC with a penetration value of 70-90 mm.

[0017] Preferably, in step S1, the steel cage includes a plurality of longitudinal bars, a plurality of stirrups and a plurality of tie bars, and the longitudinal bars, stirrups and tie bars are fixed by mutual welding or mutual binding.

[0018] Preferably, in step S4, the angle steel is welded or tied to the outside of the stirrups of the steel cage.

[0019] Preferably, each tie bar is made of a whole steel bar, both ends of which are bent to form an L-shaped corner, the length of the L-shaped corner is 3 cm, and the bending angle of the L-shaped corner is 90 degrees.

[0020] Preferably, in step S1, the tie bars are made of steel wires with a diameter of 4 mm, and the tie bars are arranged symmetrically and evenly in an equidistant array, with the spacing between adjacent tie bars being 200 mm.

[0021] Preferably, in step S3, a short support structure is used to maintain a distance between the lower edge of the steel cage and the top surface of the casting mold platform, and the short support structure is a concrete block or a plastic steel support fixture or a steel bending support.

[0022] Preferably, in step S4, the diameter of the steel wire used in the fine mesh steel wire mesh is 0.3 mm to 1.0 mm, and the mesh spacing of the fine mesh steel wire mesh is 5 mm to 10 mm.

[0023] Preferably, in step S4, the fine mesh wire mesh is connected to the angle steel by knotting or tying.

[0024] Preferably, in step S2 and step S5, short PVC tubes for assembling the tensioning screws are pre-buried in the bottom mold shell, the side mold shell and the top mold shell, respectively.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] (1) The fine mesh characteristics of the steel wire mesh combined with the special viscous UHPC formula provide ideal support for manual application;

[0027] (2) The finished product is formed in one piece, completely avoiding the problem of difficult sealing at the joints;

[0028] (3) Angle steel strengthens the integrity of the structure, making the finished components less likely to be damaged during lifting, transportation and installation.

[0029] The present invention is further described below with reference to the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a construction schematic diagram of step S1 in the present invention.

[0031] Figure 2 It is a construction schematic diagram of step S2 in the present invention.

[0032] Figure 3 It is a construction schematic diagram of step S3 in the present invention.

[0033] Figure 4 It is a construction schematic diagram of step S4 in the present invention.

[0034] Figure 5 It is a construction schematic diagram of step S5 in the present invention.

[0035] Figure 6 It is a schematic diagram of the structure of the UHPC shell column obtained in step S6 of the present invention. DETAILED DESCRIPTION

[0036] See also Figures 1 to 6As shown, in one embodiment, a UHPC formwork construction process for an assembled concrete prefabricated SW column of the present invention comprises the following steps:

[0037] S1-prefabricated steel cage 1;

[0038] S2-Set up the side mold 3 on the flat casting mold platform 2, cast the bottom mold shell 501 on the casting mold platform 2 with viscous UHPC by side touching, and slightly vibrate and assist with manual smoothing to level the surface;

[0039] S3- Before the bottom formwork 501 is initially set, the steel cage 1 is placed on the bottom formwork 501;

[0040] S4- Angle steels 11 are respectively arranged at the four corners of the steel cage 1, and fine mesh steel wire meshes 12 are respectively arranged between the angle steels 11 on both sides and the top surface of the steel cage 1;

[0041] S5- The side mold shell 502 and the top mold shell 503 which are integrated with the bottom mold shell 501 are manufactured by applying viscous UHPC on the fine mesh steel wire mesh 12;

[0042] S6-After the bottom mold shell 501, the side mold shell 502 and the top mold shell 503 reach the demoulding strength, demoulding construction is performed to obtain an integrated UHPC mold shell column 5;

[0043] S7-label the UHPC formwork column 5, stack it, package it for protection, and inspect the product quality;

[0044] S8-Transport from the factory to the construction site for assembly construction.

[0045] In the above embodiment, the present invention realizes ideal support for manual application by combining the fine-mesh steel wire mesh with a special viscous UHPC formula, thereby making the UHPC formwork column finished product integrally formed, completely avoiding the problem of difficult sealing at the joints;

[0046] Furthermore, in the above-mentioned embodiment, the present invention strengthens the integrity of the structure by using angle steels, so that the finished components are not easily damaged during the hoisting, transportation and installation processes.

[0047] As a preferred embodiment of the present invention, the bottom formwork 501, the side formwork 502 and the top formwork 503 use a viscous UHPC with a sinking value of 70-90 mm, which can better implement step S5.

[0048] As a preferred embodiment of the present invention, Figure 1As shown, in step S1, the steel cage 1 includes a plurality of longitudinal bars 101, a plurality of stirrups 102 and a plurality of tie bars 103, and the longitudinal bars 101, stirrups 102 and tie bars 103 are fixed by mutual welding or mutual binding.

[0049] As a preferred embodiment of the present invention, Figure 1 and Figure 4 As shown, in step S1, the steel cage 1 includes a plurality of longitudinal bars 101, a plurality of stirrups 102 and a plurality of tie bars 103, and the longitudinal bars 101, stirrups 102 and tie bars 103 are fixed by mutual welding or mutual binding; in step S4, the angle steel 11 is welded or bound to the outer side of the stirrups 102 of the steel cage 1.

[0050] As a preferred embodiment of the present invention, in step S1, the steel cage 1 includes a plurality of longitudinal bars 101, a plurality of stirrups 102 and a plurality of tie bars 103. The longitudinal bars 101, stirrups 102 and tie bars 103 are fixed by mutual welding or binding. Each tie bar 103 is made of a whole steel bar, and its two ends are bent to form an L-shaped corner. The length of the L-shaped corner is 3 cm, and the bending angle of the L-shaped corner is 90 degrees, so as to increase the anchoring performance of the steel cage 1 with the bottom mold shell 501, the side mold shell 502 and the top mold shell 503.

[0051] As a preferred embodiment of the present invention, in step S1, the steel cage 1 includes a plurality of longitudinal bars 101, a plurality of stirrups 102 and a plurality of tie bars 103. The longitudinal bars 101, the stirrups 102 and the tie bars 103 are fixed by mutual welding or binding. The tie bars 103 are made of steel wire with a diameter of 4 mm, and the arrangement of the tie bars 103 is symmetrically and evenly arranged in an equidistant array. The spacing between adjacent tie bars 103 is 200 mm, so that the steel cage 1 is more tightly connected with the bottom formwork 501, the side formwork 502 and the top formwork 503, and the force is greatly dispersed. In the construction process of hoisting, transportation and splicing of UHPC formwork columns 5, the UHPC formwork columns 5 are not prone to cracks.

[0052] As a preferred embodiment of the present invention, Figure 3 As shown, in step S3, a short support structure 6 is used to maintain a distance between the lower edge of the steel cage 1 and the top surface of the casting mold platform 2. Optionally, the short support structure 6 is a concrete block or a plastic steel support fixture or a steel bending support.

[0053] As a preferred embodiment of the present invention, the viscous UHPC used in the bottom formwork 501, the side formwork 502 and the top formwork 503 has a sinking value of 70-90 mm; and in step S4, the diameter of the steel wire used in the fine mesh steel wire mesh 12 is 0.3 mm to 1.0 mm, and the mesh spacing of the fine mesh steel wire mesh 12 is 5 mm to 10 mm. The above parameters of the fine mesh steel wire mesh 12 are optimized after a large number of experimental tests. The fine mesh steel wire mesh 12 under these parameters is better matched with the viscous UHPC, and step S5 can be better implemented.

[0054] As a preferred embodiment of the present invention, Figure 4 As shown, in step S4, the fine mesh steel wire mesh 12 is connected to the angle steel 11 by knotting or tying.

[0055] As a preferred embodiment of the present invention, Figure 3 and Figure 5 As shown, in step S2 and step S5, PVC short tubes 13 for assembling the tensioning screws are pre-buried in the bottom mold shell 501, the side mold shell 502 and the top mold shell 503, respectively, to facilitate the entry and exit of the tensioning screws and have little impact on the structure. Figure 1 As shown, the PVC short pipe 13 is pre-installed in the steel cage 1.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A UHPC formwork construction process for prefabricated concrete SW columns, characterized in that: The steps include: S1-prefabricated steel cage; S2-Set up the side mold on the flat casting mold platform, cast the bottom mold shell on the casting mold platform through the side mold, and slightly vibrate and assist with manual smoothing to level the surface; S3-Before the bottom formwork is initially set, place the steel cage on the bottom formwork; S4- Angle steels are respectively set at the four corners of the steel cage, and fine mesh steel wire meshes are respectively set between the angle steels on both sides and the top surface of the steel cage. The diameter of the steel wire used in the fine mesh steel wire mesh is 0.3mm to 1.0mm, and the mesh spacing of the fine mesh steel wire mesh is 5mm-10mm; S5-The side and top molds integrated with the bottom mold are made by smearing on the fine mesh steel wire mesh. The viscous UHPC used in the bottom, side and top molds has a sinking value of 70-90mm; S6-After the bottom formwork, side formwork and top formwork reach demoulding strength, demoulding construction is performed to obtain an integrated UHPC formwork column; S7-labeling, stacking, packaging and protection of UHPC formwork columns, and product qualification inspection; S8-Transport from the factory to the construction site for assembly construction.

2. A UHPC formwork construction process for prefabricated concrete SW columns according to claim 1, characterized in that: In step S1, the steel cage includes a plurality of longitudinal bars, a plurality of stirrups and a plurality of tie bars, and the longitudinal bars, stirrups and tie bars are fixed by mutual welding or mutual binding.

3. The UHPC formwork construction process for prefabricated concrete SW columns according to claim 2 is characterized in that: In step S4, the angle steel is welded or tied to the outside of the stirrups of the steel cage.

4. The UHPC formwork construction process for prefabricated concrete SW columns according to claim 2 is characterized in that: Each tie bar is made of a whole steel bar, and both ends of the steel bar are bent to form an L-shaped corner. The length of the L-shaped corner is 3 cm, and the bending angle of the L-shaped corner is 90 degrees.

5. The UHPC formwork construction process for prefabricated concrete SW columns according to claim 2 is characterized in that: In step S1, the tie bars are made of steel wire with a diameter of 4 mm, and the tie bars are arranged symmetrically and evenly in an equidistant array, with a spacing of 200 mm between adjacent tie bars.

6. The UHPC formwork construction process for prefabricated concrete SW columns according to claim 1, characterized in that: In step S3, a short support structure is used to maintain a distance between the lower edge of the steel cage and the top surface of the casting mold platform. The short support structure is a concrete block or a plastic steel support fixture or a steel bending support.

7. The UHPC formwork construction process for prefabricated concrete SW columns according to claim 1, characterized in that: In step S4, the fine mesh wire mesh is connected to the angle steel by knotting or tying.

8. The UHPC formwork construction process for prefabricated concrete SW columns according to claim 1, characterized in that: In step S2 and step S5, short PVC tubes for assembling the tensioning screws are pre-embedded in the bottom mold shell, the side mold shell and the top mold shell respectively.

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