Low-carbon anti-corrosion concrete column and preparation method thereof

Abstract

The invention discloses a low-carbon anti-corrosion concrete column and a preparation method thereof.The low-carbon anti-corrosion concrete column comprises a plurality of shell plates, a post-pouring space is defined by the shell plates, each shell plate is provided with two opposite adjacent sides, the adjacent sides extend in the plate face direction to form a plurality of inserting tenons, the inserting tenons of the two adjacent sides are arranged in a staggered mode, and the inserting tenons of the two adjacent sides are arranged in a staggered mode; a plurality of inserting tenons are arranged in the shell plates, a socket mortise is formed between every two adjacent inserting tenons, the inserting tenons are inserted into the socket mortises of the adjacent shell plates, vertical through holes are formed in the inserting tenons, the shell plates are aluminoferrite cement prefabricated plates, lantern rings are formed on the side portions of the steel bar structures in the shell plates, and the lantern rings are sleeved with the inserting tenons. The lantern ring and the vertical through hole are coaxially arranged; the connecting ribs are inserted into the vertical through holes of the inserting tenons on the adjacent sides of every two adjacent shell plates; and the cast-in-place concrete is poured into the post-pouring space. The problem that durability of a common concrete column is degraded in the ocean dry-wet cycle environment is solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a low-carbon anti-corrosion concrete column and a preparation method thereof. Background Art

[0002] At present, the alternation of dry and wet conditions in the marine environment accelerates the transmission and accumulation of corrosive ions in concrete, causing the concrete to be more damaged and deteriorated, seriously affecting the mechanical properties of the concrete structure and shortening its service life. Especially for reinforced concrete structures, the dry-wet cycle causes the chloride ion concentration on the surface of the steel bars to increase continuously. When the chloride ion concentration reaches the critical concentration, the passive film of the steel bars begins to be destroyed, and destructive rust is continuously generated under the action of oxygen and water, resulting in a decrease in the performance of the concrete structure. It is very important to improve the durability of the structure in the marine environment. Summary of the invention

[0003] In order to overcome the defects of the prior art, a low-carbon anti-corrosion concrete column and a preparation method thereof are provided to solve the problem of durability degradation of ordinary concrete columns in the marine dry-wet cycle environment.

[0004] To achieve the above object, a low-carbon anti-corrosion concrete column is provided, comprising:

[0005] A plurality of shell plates, wherein the plurality of shell plates are enclosed to form a post-casting space, the shell plate has two adjacent sides opposite to each other, the adjacent sides are extended along the plate surface direction to form a plurality of plug-in tenons, the plug-in tenons of the two adjacent sides are staggered, a socket tenon groove is formed between two adjacent plug-in tenons, the plurality of plug-in tenons are inserted into the plurality of socket tenons of adjacent shell plates, the plug-in tenons are provided with vertical through holes, the shell plate is a prefabricated plate made of ferroaluminate cement, a collar is formed on the side of the steel structure in the shell plate, and the collar is coaxially arranged with the vertical through hole;

[0006] Connecting ribs are inserted into the vertical through holes of the plug-in tenons on the adjacent sides of two adjacent shell plates;

[0007] Cast-in-place concrete is poured into the post-casting space.

[0008] Furthermore, a plurality of convex ridges are formed on the inner side of the shell plate, and the plurality of convex ridges are arranged at intervals along the width direction of the shell plate.

[0009] Furthermore, the convex ridges are arranged along the vertical direction.

[0010] Furthermore, the inner side of the shell plate is coated with an epoxy resin modified polymer coating.

[0011] Furthermore, the outer side of the epoxy resin modified polymer coating is sprayed with aluminoferrite-based active slurry.

[0012] Furthermore, the silica fume content of the ferroaluminate cement precast board is 5% to 10%.

[0013] Furthermore, a sealing slurry is filled between the plug tenon and the socket tenon groove.

[0014] Furthermore, the steel bar structure includes a plurality of vertical bars and transverse bars arranged crosswise, and ends of the transverse bars extend into the plug-in tenons and are bent to form the rings.

[0015] Furthermore, the vertical reinforcement and the transverse reinforcement are FRP reinforcement or steel reinforcement.

[0016] The present invention provides a method for preparing a low-carbon anti-corrosion concrete column, comprising the following steps:

[0017] A plurality of shell plates are enclosed to form a post-casting space, wherein a plurality of inserting tenons of the shell plates are inserted into a plurality of socket-slotted tenons of adjacent shell plates;

[0018] Connecting ribs are inserted into the vertical through holes of the plug-in tenons on the adjacent sides of two adjacent shell plates;

[0019] Cast-in-situ concrete is poured into the post-casting space to solidify and form a low-carbon anti-corrosion concrete column.

[0020] The beneficial effect of the present invention is that the low-carbon anti-corrosion concrete column of the present invention resists the invasion of corrosive ions in the marine environment by rationally utilizing the high corrosion resistance of the ferroaluminate cement (FAC) of the shell plate, so that the concrete can be used in the marine environment for a long time. The low-carbon anti-corrosion concrete column of the present invention is made into FAC concrete by prefabricating embedded FRP bars or steel mesh, which are spliced ​​to wrap the concrete inner column. The low-carbon anti-corrosion concrete column of the present invention creates a closed environment by forming a right-angle mortise and tenon joint structure through the plug-in tenon and the socket tenon groove of the shell plate, and utilizes the characteristics of the elastic modulus of FAC concrete that is similar to that of concrete, so that the two work together to bear force together, so as to meet the application of concrete in the marine environment and improve the durability of the concrete column. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 It is a schematic structural diagram of a low-carbon anti-corrosion concrete column according to an embodiment of the present invention.

[0023] Figure 2 Schematic diagram of the structure of the inner side of the shell plate according to an embodiment of the present invention.

[0024] Figure 3Schematic diagram of the structure of the outer side of the shell plate according to an embodiment of the present invention.

[0025] Figure 4 Schematic diagram of the structure of the steel bar structure according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] Reference Figures 1 to 4 As shown, the present invention provides a low-carbon anti-corrosion concrete column, comprising: a shell plate 1, connecting bars 2, and cast-in-place concrete 3.

[0029] There are multiple shell plates 1. Multiple shell plates 1 enclose a post-casting space. In this embodiment, the shell plates are rectangular and vertically arranged. There are four shell plates. Four shell plates enclose a rectangular post-casting space.

[0030] Specifically, the shell plate 1 has two adjacent sides opposite to each other. In this embodiment, the two adjacent sides refer to two opposite sides in the width direction of the shell plate. Each adjacent side of the shell plate is formed with a plurality of plug-in tenons 11 extending along the plate surface direction. The plug-in tenons 11 on the two adjacent sides of each shell plate are staggered. A socket-and-slot groove a is formed between two adjacent plug-in tenons 11. The plurality of plug-in tenons 11 are inserted into the plurality of socket-and-slot grooves a of the adjacent shell plates 1.

[0031] The space between the plug tenon 11 and the socket tenon groove a and the vertical through hole are filled with sealing slurry.

[0032] The plug-in tenon 11 is provided with a vertical through hole b. A collar 1311 is formed on the side of the steel bar structure 13 in the shell plate 1. The collar 1311 is coaxially arranged with the vertical through hole b.

[0033] See also Figure 4 As shown, in this embodiment, the steel bar structure is a steel bar grid structure. Specifically, the steel bar structure 13 includes a plurality of vertical bars 132 and transverse bars 131. The vertical bars 132 and the transverse bars 131 are arranged crosswise. The vertical bars 132 are arranged in the vertical direction, and the transverse bars 131 are arranged in the width direction of the shell plate. The end of the transverse bar 131 extends into the insertion tenon 11 and is bent to form a collar 1311.

[0034] As a preferred embodiment, the vertical ribs 132 and the transverse ribs 131 are FRP bars or steel bars.

[0035] Furthermore, the FRP tendons include CFRP tendons, GFRP tendons, BFRP tendons, AFRP tendons, and HFRP tendons.

[0036] A connecting rib 2 is inserted into the vertical through hole b of the plug-in tenon 11 on the adjacent sides of two adjacent shell plates 1 .

[0037] Cast-in-place concrete 3 is poured into the post-casting space.

[0038] Combination Figure 2 and Figure 3 As shown, the thickness of the shell plate is 50-100 mm. A plurality of convex ridges 12 are formed on the inner side of the shell plate 1. The plurality of convex ridges 12 are arranged at intervals along the width direction of the shell plate 1.

[0039] In this embodiment, the convex ribs 12 are arranged along the vertical direction.

[0040] The inner side of the shell plate 1 is coated with an epoxy resin modified polymer coating, and the outer side of the epoxy resin modified polymer coating is sprayed with alumina-ferroferrate based active slurry.

[0041] In this embodiment, the shell plate 1 is a prefabricated ferroaluminate cement plate, and the silica fume content of the prefabricated ferroaluminate cement plate is 5% to 10%.

[0042] The present invention provides a method for preparing a low-carbon anti-corrosion concrete column, comprising the following steps:

[0043] S1. A plurality of shell plates 1 are enclosed to form a post-casting space, and a plurality of plug-in tenons 11 of the shell plates 1 are inserted into a plurality of socket-and-spigot grooves a of adjacent shell plates 1.

[0044] First, prepare the shell plate. The specific shell plate preparation includes:

[0045] The shell plate is made of ferroaluminate cement concrete shell plate. Through the template design, the inner surface of the shell plate presents rib-like protrusions to form convex ridges. The adjacent side joints of the two adjacent shell plates adopt a right-angle splicing mortise and tenon structure, and then the overall frame is formed by splicing the tenon (protruding part) and the socket tenon (recessed part). The width of the tenon and the tenon groove is consistent with the thickness of the shell plate for splicing. The height of the tenon and the tenon groove is 80% to 100% of the tenon groove width, and a steel mesh is placed in the template, in which the end of the transverse reinforcement extends into the plug-in tenon and is made into a hook or ring shape. The vertical through hole at the corresponding position of the plug-in tenon forms a channel. The channel is set at the corner of the entire column. The channel is used to pass the connecting reinforcement.

[0046] The thickness of the shell plate is controlled at 50-100 mm, and a steel mesh is inserted to improve the crack resistance of the ferroaluminate cement shell, with four templates in one.

[0047] Cast ferroaluminate cement concrete to form the ferroaluminate cement concrete shell outside the prefabricated core tube. After the shell is cured, the inner surface of the shell is sandblasted or brushed to form a rough texture to increase the friction coefficient.

[0048] 5% to 10% silica fume is added to the ferroaluminate cement of the shell plate to improve its density, and steel shear members are pre-embedded to improve the interface connection performance.

[0049] S2. A connecting rib 2 is inserted into the vertical through hole b of the plug-in tenon 11 on the adjacent sides of two adjacent shell plates 1.

[0050] The four shell plates are assembled, and connecting bars are inserted at the corners. Then, the interface adhesive is applied to the joints, and the formwork is sealed as a whole by filling with ferroaluminate cement mortar or high-strength mortar or modified active slurry.

[0051] S3, pouring cast-in-place concrete 3 into the post-casting space to consolidate and form a low-carbon anti-corrosion concrete column.

[0052] Check the stability and sealing of the spliced ​​shell plates, place the tied internal concrete column reinforcement cage into the post-casting space of the assembled shell plates, pour cast-in-place concrete (ordinary concrete), and fully vibrate and compact it to ensure that the inner core concrete is fully combined with the rib-like protrusions on the inner surface of the shell plates.

[0053] The inner concrete column reinforcement cage part and the reinforcement part in the ferroaluminate cement concrete precast shell form the mixed reinforcement of the composite column.

[0054] In this embodiment, the roughening treatment of the inner side of the shell plate can significantly improve the shear resistance of the interface. For example, in relevant experiments, the friction coefficient of the rough interface can be increased by 50% to 70% compared with the smooth interface.

[0055] Studies on embedded steel grids in shell plates have shown that the steel grids can significantly disperse stress concentration caused by crack propagation, improving the shell plate's crack resistance by 30% to 40%.

[0056] The corrosion resistance experiment simulates the service life of the column in the actual corrosion environment. The statistical data shows that the service life of the shell plate using ferroaluminate cement concrete is extended by more than 50% compared with the traditional ordinary concrete.

[0057] The embedded steel mesh design reduces the crack width of the shell plate by 30% to 40%, especially under high temperature or load impact conditions, showing higher ductility and crack control ability.

[0058] The internal and external coordinated design ensures the high strength of the column. The high compressive strength of the ordinary concrete in the inner core and the high toughness of the shell plate combine to increase the compressive strength of the column by about 25%.

[0059] Factory prefabrication significantly shortens the construction period. Standardized operations of shell plate transportation and on-site installation reduce human errors. At the same time, the interface treatment process is closely integrated with the core casting, ensuring the quality consistency of the column at different construction stages.

[0060] The mechanical properties of the FAC shell and the internal core concrete column are similar, and the axial compressive bearing capacity of the column can be calculated using a simple linear superposition method, namely:

[0061] N=σ FAC (ε FAC )A FAC +σ 混凝土 (ε 混凝土 )A 混凝土 +σ S (ε S )A S

[0062] Where: FAC , σ 混凝土 , σ S are the stresses of FAC, concrete, and steel bars, respectively;

[0063] ε FAC , ε 混凝土 , ε S are the strains of FAC, concrete, and steel bars, respectively;

[0064] A FAC , A 混凝土 , A S are the cross-sectional areas of FAC, concrete, and steel bars, respectively.

[0065] The low-carbon and anti-corrosion concrete column of the present invention resists the invasion of corrosive ions in the marine environment by rationally utilizing the high corrosion resistance of the ferroaluminate cement (FAC) of the shell plate, so that the concrete can be used in the marine environment for a long time. The low-carbon and anti-corrosion concrete column of the present invention is made of FAC concrete by prefabricating an embedded steel mesh, which is spliced ​​to wrap the concrete inner column. The low-carbon and anti-corrosion concrete column of the present invention creates a closed environment by forming a right-angle mortise and tenon joint structure through the plug-in tenon and the socket-and-slot tenon groove of the shell plate, and utilizes the characteristics of the elastic modulus of FAC concrete that is similar to that of concrete, so that the two work together to bear force together to meet the application of concrete in the marine environment.

[0066] The low-carbon anti-corrosion concrete column of the present invention is designed in coordination with the internal common concrete and the prefabricated outer shell of ferroaluminate cement concrete, so that the concrete column can be used for a long time in the marine environment as a reinforcement column idea and means.

[0067] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A low-carbon anti-corrosion concrete column, characterized in that: include: A plurality of shell plates, wherein the plurality of shell plates are enclosed to form a post-casting space, the shell plate has two adjacent sides opposite to each other, the adjacent sides are extended along the plate surface direction to form a plurality of plug-in tenons, the plug-in tenons of the two adjacent sides are staggered, a socket tenon groove is formed between two adjacent plug-in tenons, the plurality of plug-in tenons are inserted into the plurality of socket tenons of adjacent shell plates, the plug-in tenons are provided with vertical through holes, the shell plate is a prefabricated plate made of ferroaluminate cement, a collar is formed on the side of the steel structure in the shell plate, and the collar is coaxially arranged with the vertical through hole; Connecting ribs are inserted into the vertical through holes of the plug-in tenons on the adjacent sides of two adjacent shell plates; Cast-in-place concrete is poured into the post-casting space.

2. The low-carbon anti-corrosion concrete column according to claim 1, characterized in that: A plurality of convex ridges are formed on the inner side of the shell plate, and the plurality of convex ridges are arranged at intervals along the width direction of the shell plate.

3. The low-carbon anti-corrosion concrete column according to claim 2, characterized in that: The convex ridges are arranged along the vertical direction.

4. The low-carbon anti-corrosion concrete column according to claim 2, characterized in that: The inner side of the shell plate is coated with an epoxy resin modified polymer coating.

5. The low-carbon anti-corrosion concrete column according to claim 4, characterized in that: The outer side of the epoxy resin modified polymer coating is sprayed with aluminoferrate-based active slurry.

6. The low-carbon anti-corrosion concrete column according to claim 1, characterized in that: The silica fume content of the ferroaluminate cement prefabricated board is 5% to 10%.

7. The low-carbon anti-corrosion concrete column according to claim 1, characterized in that: The space between the plug tenon and the socket tenon groove is filled with a plugging slurry.

8. The low-carbon anti-corrosion concrete column according to claim 1, characterized in that: The steel bar structure comprises a plurality of vertical bars and transverse bars arranged crosswise, and the ends of the transverse bars extend into the insert tenons and are bent to form the rings.

9. The low-carbon anti-corrosion concrete column according to claim 8, characterized in that: The vertical reinforcement and the transverse reinforcement are FRP reinforcement or steel reinforcement.

10. A method for preparing a low-carbon anticorrosive concrete column as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: A plurality of shell plates are enclosed to form a post-casting space, wherein a plurality of plug-in tenons of the shell plates are inserted into a plurality of socket-and-slot grooves of adjacent shell plates; Connecting ribs are inserted into the vertical through holes of the plug-in tenons on the adjacent sides of two adjacent shell plates; Cast-in-situ concrete is poured into the post-casting space to solidify and form a low-carbon anti-corrosion concrete column.

Images