Construction method of ultrahigh special-shaped fair-faced column

Abstract

The invention relates to a construction method of an ultrahigh special-shaped fair-faced column. The construction method comprises the following steps that a formwork for pouring is manufactured according to the design size of a fair-faced column body; binding a steel reinforcement framework required by the column body in a construction area; the formwork is installed on the outer side of the steel reinforcement framework; brushing a release agent on the inner wall of the template; fair-faced concrete is injected into the formwork; and after the cast fair-faced concrete is completely solidified, the formwork is dismantled to obtain the column body, and the outer wall of the column body is coated with a protective agent. According to the construction method of the ultrahigh special-shaped bare concrete column, the bare concrete column is formed at a time without a transverse joint through formwork pouring, the inner wall of the formwork is coated with the release agent, the demolding efficiency is improved, efficient construction of the special-shaped bare concrete column with the variable cross section is achieved, and the construction quality and the forming effect are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to a construction method for super-high special-shaped fair-faced columns. Background Art

[0002] Traditionally, there are mainly three reasons for the poor construction quality and forming effect of super-high special-shaped fair-faced concrete columns: First, compared with ordinary structural columns, special-shaped fair-faced columns increase longitudinal reinforcement and stirrups, making formwork installation and removal difficult and the construction difficult; second, fair-faced concrete requires one-time pouring and forming. During the pouring process, the lateral pressure of the concrete on the formwork is large, and high requirements are placed on the formwork stress and deformation control. The formwork is prone to deformation after multiple turnovers, affecting the construction quality and forming effect; third, when using wooden formwork for construction, color differences and uneven bubble holes are likely to appear on the surface of fair-faced concrete, affecting the appearance, and high requirements are placed on the forming quality.

[0003] In response to the above problems, there are already relatively mature solutions, such as designing and processing formwork, and using steel frames and smooth bamboo plywood as fair-faced concrete formwork; using a chain block for the vertical transportation of the formwork on the scaffold and manual handling for the horizontal transportation; using tie bolts for reinforcement, setting a horizontal visible joint at each construction joint of the formwork to match it, and forming regular Chan joints at the formwork joints.

[0004] Although the above technologies can solve the general problems of fair-faced concrete column construction, they cannot eliminate the problems of poor connection between formworks and leakage of slurry caused by the imperfect position of tie bolt holes. Improper processing of the steel bar thread heads makes the thread heads prone to contamination and damage after the steel cage is fabricated and formed; problems such as imperfect formwork joints, uneven formwork sides, and inconsistent thickness of adjacent formworks will all cause slurry leakage or offset at the splicing joints, affecting the visual quality of the Chan joints. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a construction method for super-high special-shaped fair-faced columns, so as to solve the problems that the construction of existing special-shaped super-high fair-faced concrete cannot meet the requirements of one-time forming without horizontal joints and bolt holes, and it is easy to pollute and damage the fair-faced concrete finish during formwork removal, affecting the construction quality and visual effect.

[0006] The technical solution to achieve the above purpose is: A construction method for super-high special-shaped fair-faced columns, including the following steps: fabricating formwork for pouring according to the designed dimensions of the fair-faced column body; binding the steel bar skeleton required for the column body in the construction area; installing the formwork outside the steel bar skeleton; applying a release agent to the inner wall of the formwork; injecting fair-faced concrete into the formwork; after the poured fair-faced concrete is completely solidified, removing the formwork to obtain the column body, and applying a protective agent to the outer wall of the column body.

[0007] In the construction method of a super-high special-shaped fair-faced concrete column of the present invention, the fair-faced concrete column is formed in one go without horizontal joints through formwork pouring. A demoulding agent is applied to the inner wall of the formwork, which improves the demoulding efficiency, realizes the efficient construction of the special-shaped variable cross-section fair-faced concrete column, and ensures the construction quality and forming effect.

[0008] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that the formwork for pouring is fabricated according to the designed dimensions of the fair-faced concrete column body, including: arranging two opposite first panels and two opposite second panels to enclose and join together to form a pouring area.

[0009] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that the formwork for pouring fabricated according to the designed dimensions of the fair-faced concrete column body further includes: performing finite element calculation and verification based on the formwork to determine whether it can withstand the lateral pressure of the poured concrete.

[0010] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that the steel bar framework required for the column body is tied in the construction area, including: positioning according to the inserted steel bars reserved when pouring the floor slab, and butt-joining and tying the main steel bars correspondingly.

[0011] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that the formwork is installed outside the steel bar framework, including: arranging multiple layers of external braces outside the formwork and clamping and limiting the formwork.

[0012] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that after the poured fair-faced concrete is completely solidified, the formwork is removed to obtain the column body, and a protective agent is applied to the outer wall of the column, including: first removing the external braces, and then separating the formwork from the column body.

[0013] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that applying the demoulding agent to the inner wall of the formwork includes: preparing a water-based demoulding agent corresponding to the fair-faced concrete.

[0014] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that injecting fair-faced concrete into the formwork includes: pouring a slurry receiving layer at the bottom of the formwork.

[0015] A further improvement in the construction method of a super-high special-shaped fair-faced concrete column of the present invention is that after the poured fair-faced concrete is completely solidified, the formwork is removed to obtain the column body, and a protective agent is applied to the outer wall of the column further includes: enclosing the arc corners on the column body with three-ply boards.

[0016] A further improvement of the construction method of the ultra-high special-shaped fair-faced column of the present invention lies in that after the fair-faced concrete to be poured is completely solidified, the formwork is removed to obtain the column body, and a protective agent is applied to the outer wall of the column body. It further includes covering the steel bars exposed at the top of the column body with a waterproof layer. Description of the Drawings

[0017] Figure 1 It is a schematic flow chart of the construction method of an ultra-high special-shaped fair-faced column of the present invention.

[0018] Figure 2 It is a schematic flow chart of step S110 of the present invention.

[0019] Figure 3 It is a sectional view of the construction of an ultra-high special-shaped fair-faced column of the present invention.

[0020] Figure 4 It is a schematic connection diagram of the first panel and the second panel of the present invention.

[0021] Figure 5 It is another schematic flow chart of step S110 of the present invention.

[0022] Figure 6 It is a schematic flow chart of step S120 of the present invention.

[0023] Figure 7 It is a schematic flow chart of step S130 of the present invention.

[0024] Figure 8 It is a schematic structural diagram of the construction of an ultra-high special-shaped fair-faced column of the present invention.

[0025] Figure 9 It is a schematic flow chart of step S160 of the present invention.

[0026] Figure 10 It is a schematic flow chart of step S140 of the present invention.

[0027] Figure 11 It is a schematic flow chart of step S150 of the present invention.

[0028] Figure 12 It is another schematic flow chart of step S160 of the present invention.

[0029] Figure 13 It is another schematic flow chart of step S160 of the present invention.

[0030] In the figure: 10, formwork; 101, pouring area; 11, first panel; 111, first keel; 12, second panel; 121, second keel; 13, external support; 14, tie bolt; 15, border; 16, connecting bolt; 17, positioning pin. Detailed Embodiments

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Refer to Figure 1 , which shows a schematic flow chart of a construction method for an ultra-high special-shaped fair-faced column of the present invention. The present invention provides a construction method for an ultra-high special-shaped fair-faced column, including the following steps:

[0033] Execute step S110: Fabricate the formwork 10 for pouring according to the designed dimensions of the fair-faced column body.

[0034] Among them, the fair-faced column is arranged on the floor slab, and the construction of the fair-faced column body is carried out after the construction of the floor slab. The formwork 10 is formed according to the designed shape of the outer wall of the fair-faced column body, and the size of the formwork 10 corresponds to the designed dimensions of the fair-faced column body. Then, execute step S120.

[0035] Execute step S120: Bind the steel bar framework required for the column body in the construction area.

[0036] Among them, the construction area is above the floor slab, and the steel bar framework is vertically erected on the upper end surface of the floor slab. Then, execute step S130.

[0037] Execute step S130: Install the formwork 10 outside the steel bar framework.

[0038] Among them, the formwork 10 is installed by hoisting. During the process of hoisting and assembling the formwork 10, attention should be paid to avoiding collisions. The formwork 10 needs to be hoisted in place at one time during the hoisting process. Horizontally, the formwork 10 should be fixed firmly during hoisting to avoid tilting and twisting of the formwork 10 during hoisting and avoid collisions with the temporary structures in the foundation pit. During construction, positioning lines can be drawn at the place where the formwork 10 is arranged outside the steel bar framework to facilitate the layout of the positioning formwork 10 and to check the position of the formwork 10 through the lines to ensure the accuracy of construction. Then, execute step S140.

[0039] Execute step S140: Apply the release agent to the inner wall of the formwork 10.

[0040] Among them, the release agent is applied before pouring the concrete to facilitate separation during formwork removal. Then, execute step S150.

[0041] Execute step S150: Pour fair-faced concrete into the formwork 10.

[0042] Among them, the injection end of the concrete is set at the top opening of the formwork 10, and the concrete is injected from the top of the formwork 10. During pouring, multiple vibration points should be arranged, and the construction personnel need to use vibrating rods to vibrate the concrete injected into the formwork 10, which can avoid the generation of cavities in the formwork 10 and affect the pouring of the column body, and ensure the structural quality of the column body. Then, execute step S160.

[0043] Execute step S160: after the plain concrete to be poured is completely solidified, remove the formwork 10 to obtain the column, and apply a protective agent on the outer wall of the column.

[0044] Among them, the solidified column must be cured before applying the protective agent.

[0045] See also Figure 2 , Figure 3 and Figure 4 , Figure 2 The schematic diagram of the process of step S110 of the present invention is shown. Figure 3 This is a cross-sectional view of the construction of an ultra-high special-shaped clear water column of the present invention. Figure 4 The present invention provides a construction method for an ultra-high special-shaped clear water column, and step S110 includes:

[0046] Execute step S111 : arrange two opposite first panels 11 and two opposite second panels 12 to enclose and splice into a casting area 101 .

[0047] Among them, the first panel 11 is an arc-shaped plate, corresponding to the arc side of the clear water column, and the second panel 12 is a straight panel, corresponding to the straight side of the clear water column. An outer frame 15 is set at the joint edge of the first panel 11 and the second panel 12, and the first panel 11 and the second panel 12 are connected by connecting bolts 16 through the outer frames 15 on both sides to avoid the formation of screw holes on the side wall of the column. A positioning pin 17 can also be set on the frame 15 to connect the first panel 11 and the second panel 12 to further position the first panel 11 and the second panel 12. Four vertical seams are formed at the connection between the first panel 11 and the second panel 12. In this embodiment, the column cast by the template 10 has no transverse seams and screw holes.

[0048] In this embodiment, a plurality of first keels 111 are arranged at intervals in the first panel 11 to ensure the internal support force. The first panel 11 can be made of a steel plate, and the first keel 111 can be made of a channel steel. A plurality of second keels 121 are arranged at intervals in the second panel 12. The second panel 12 can also be made of a steel plate, which facilitates the connection between the first panel 11 and the second panel 12. The second keel 121 can be made of a channel steel. The sizes of the second keel 121 and the first keel 111 are selected according to specific needs and are not specifically limited here.

[0049] See also Figure 5 , shows another flow chart of step S110 of the present invention. The present invention provides a construction method of an ultra-high special-shaped clear water column, step S110 further comprising:

[0050] Execute step S112: perform finite element calculation based on the template 10 to determine whether it can withstand the pressure of pouring concrete.

[0051] Among them, for the finite element verification, ANSYS finite element analysis is used. The lateral pressure borne by the formwork 10 can be calculated according to the "Safety Technical Code for Building Construction Formwork 10" (JGJ-162). The following assumptions are made for the calculation parameters: The gravity density γ of the newly poured concrete c = 25 kN / m 3 . The initial setting time t0 of the newly poured concrete is 7 h. The correction coefficient β1 for the influence of admixtures is 1. The influence coefficient β2 for the slump of concrete is 1.15. γ0 = 1.0. The pouring speed V of the concrete is 0.7 m / h. The standard value Q of the live load k = 4 kN / m 2 .

[0052] When using internal vibrators, the standard value of the maximum lateral pressure exerted by the newly poured concrete on the formwork 10 is calculated according to the following two formulas, and the smaller value of the two formulas is taken:

[0053] F1 = 0.22γ c t0β1β2V 1 / 2 (1)

[0054] F2 = γ c H (2)

[0055] In this embodiment, for the deformation analysis and calculation of the formwork 10, only the standard value of the maximum lateral pressure exerted by the newly poured concrete on the formwork 10 when using internal vibrators is considered. For the stress analysis and calculation of the formwork 10, the design value of the load (i.e., considering the load partial coefficient) is used.

[0056] Refer to Figure 6 , which shows the flow schematic diagram of step S120 of the present invention. The present invention provides a construction method for super-high special-shaped fair-faced columns. Step S120 includes:

[0057] Execute step S121: According to the positioning of the inserted steel bars reserved when pouring the floor slab, the main steel bars are butt-jointed and tied.

[0058] Among them, after the main steel bars are butt-jointed and tied, stirrups are sleeved on the outside. According to the position lines that have been marked, the sleeved stirrups are moved upward and tied from top to bottom, using the winding tie method. The main steel bar protective layer blocks are tied and fixed on the outermost main steel bars, and the spacing is set according to the actual construction requirements to ensure the accurate thickness of the main steel bar protective layer.

[0059] Refer to Figure 3 , Figure 7 and Figure 8 , Figure 3 which shows the cross-sectional view of the construction of a super-high special-shaped fair-faced column of the present invention, Figure 7 which shows the flow schematic diagram of step S130 of the present invention, Figure 8Shows a structural schematic diagram of the construction of an ultra-high special-shaped fair-faced column of the present invention. The present invention provides a construction method for an ultra-high special-shaped fair-faced column, and step S130 includes:

[0060] Execute step S131: Set multiple layers of external braces 13 on the outer side of the formwork 10, and clamp and limit the formwork 10.

[0061] Among them, the upper and lower layers of external braces 13 are arranged parallel to each other, and the distance between the upper and lower layers of external braces 13 is set according to actual construction requirements, and no specific limitation is made here. The external braces 13 arranged on both sides of the formwork 10 are connected by tie bolts 14, and the distance can be adjusted according to the width of the formwork 10 at different heights for clamping.

[0062] In this embodiment, the external brace 13 abuts against the outer side surface of the second formwork 10 of the formwork 10.

[0063] Refer to Figure 9 , which shows a flow schematic diagram of step S160 of the present invention. The present invention provides a construction method for an ultra-high special-shaped fair-faced column, and step S160 includes:

[0064] Execute step S161: First remove the external brace 13, and then separate the formwork 10 from the column body.

[0065] Among them, for the removal of the external brace 13, the through-bar nut needs to be loosened first, the positioning pin 17 is withdrawn, and the clamping of the formwork 10 is released. The support for the formwork 10 is released to separate the formwork 10 from the column body. If the formwork 10 is firmly bonded to the column body, gently pry the formwork 10 with a crowbar to separate it from the column body. Pull the formwork 10 horizontally outwards, and when it is 50 mm away from the column surface, then lift the formwork 10 separated from the concrete surface to the ground, clean the ash and apply the release agent.

[0066] Refer to Figure 10 , which shows a flow schematic diagram of step S140 of the present invention. The present invention provides a construction method for an ultra-high special-shaped fair-faced column, and step S140 includes:

[0067] Execute step S141: Prepare a water-based release agent corresponding to fair-faced concrete.

[0068] Among them, the components of the release agent include silicone oil, Span90, Op-10, pure water, PEG-400, PEG-2000, xanthan gum, and triethanolamine. To ensure the forming effect of fair-faced concrete, the fair-faced concrete formwork 10 requires a special water-based release agent, and a colored release agent cannot be selected to prevent pollution after the concrete is formed.

[0069] Refer to Figure 11 , which shows a flow schematic diagram of step S150 of the present invention. The present invention provides a construction method for an ultra-high special-shaped fair-faced column, and step S150 includes:

[0070] Perform step S151: Pour a slurry receiving layer at the bottom of formwork 10.

[0071] Among them, the concrete composition of the poured slurry receiving layer is selected to be the same as that of the fair-faced concrete column to avoid color difference. The interface between the concrete slurry receiving layer and the fair-faced concrete column can be roughened. The thickness of the slurry receiving layer is set to 30 cm.

[0072] Refer to Figure 12 , which shows another process schematic diagram of step S160 of the present invention. The present invention provides a construction method for a super-high special-shaped fair-faced column. Step S160 further includes:

[0073] Perform step S162: Enclose the arc corners on the column with three-ply boards.

[0074] Among them, the finished product protection and protective agent painting of the column are carried out in three stages. The first stage is the protection operation during the construction stage. After the fair-faced concrete column is removed from the formwork, it is sealed and wrapped with plastic film for curing. The outside of the column is wrapped with thick wood boards, and the arc corners are wrapped with three-ply boards when necessary.

[0075] The second stage is to paint the primer of the protective agent on the outer wall of the column. First, remove the wrapping materials on the surface of the column in batches in the previous stage, then remove the release agent, dust and other pollutants on the surface of the column, conduct a concealed acceptance of the base layer, apply a transparent fair-faced concrete protective agent primer, and after the primer is dry, wrap three-ply boards in the range of 2 m above the column foot.

[0076] The third stage is the topcoat construction and protection. Remove the wrapping materials on the outside of the column in the previous stage, and remove the dust on the surface of the column. Apply the fair-faced concrete protective agent topcoat. After acceptance, wrap three-ply boards within the range of two meters above the ground, and prevent the column and the protective agent on the outside from being rubbed and damaged by setting corner guards.

[0077] Refer to Figure 13 , which shows another process schematic diagram of step S160 of the present invention. The present invention provides a construction method for a super-high special-shaped fair-faced column. Step S160 further includes:

[0078] Perform step S163: Cover the reinforcing bars exposed at the top of the column with a waterproof layer.

[0079] Among them, the reinforcing bars exposed at the top of the column can be tied and sealed with multiple layers of waterproof cloth to prevent rusting caused by rain.

[0080] The present invention has been described in detail above in combination with the embodiments shown in the drawings. Those of ordinary skill in the art can make various changes to the present invention according to the above description. Therefore, some details in the embodiments should not constitute a limitation to the present invention, and the protection scope of the present invention will be defined by the scope defined in the appended claims.

Claims

1. A construction method for an ultra-high special-shaped clear water column, characterized in that: The steps include: Make casting templates according to the design dimensions of the clean water column; Tie up the steel reinforcement skeleton required for the column in the construction area; Install the template outside the steel frame; Applying a release agent to the inner wall of the template; Injecting plain concrete into the formwork; After the cast plain concrete is completely solidified, the template is removed to obtain the column, and a protective agent is applied to the outer wall of the column.

2. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: The method of making a pouring template according to the design size of the clear water column body comprises: Two opposite first panels and two opposite second panels are arranged to surround and splice a casting area.

3. The construction method of a super-high special-shaped clear water column according to claim 2, characterized in that: The method of making a pouring template according to the design size of the clean water column body also includes: Finite element calculation is performed based on the template to determine whether it can withstand the pressure of pouring concrete.

4. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: The steel reinforcement skeleton required for tying the column in the construction area includes: According to the positioning of the dowel bars reserved when pouring the slabs, use the main bars to extend and tie them accordingly.

5. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: The step of installing the template outside the steel reinforcement skeleton comprises: A plurality of layers of external support members are arranged on the outer side of the template to clamp and limit the template.

6. The construction method of a super-high special-shaped clear water column according to claim 5, characterized in that: After the plain concrete to be poured is completely solidified, the template is removed to obtain the column, and the outer wall of the column is coated with a protective agent, which includes: Firstly, the outer support member is removed, and then the template and the column are separated.

7. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: The step of applying the release agent to the inner wall of the template comprises: Prepare a water-based release agent corresponding to the plain concrete.

8. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: The injecting of plain concrete into the template comprises: A slurry layer is poured at the bottom of the formwork.

9. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: After the plain concrete to be poured is completely solidified, the template is removed to obtain the column, and the outer wall of the column is coated with a protective agent, which further comprises: The arc corners on the column are surrounded by plywood.

10. The construction method of a super-high special-shaped clear water column according to claim 1, characterized in that: After the plain concrete to be poured is completely solidified, the template is removed to obtain the column, and the outer wall of the column is coated with a protective agent, which further comprises: The exposed tendons on the top of the column are covered with a waterproof layer.

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