A method for hanging mesh concrete construction

Abstract

The present invention relates to the field of building construction, and in particular to a mesh concrete construction method. The specific process includes base surface cleaning, mortar masonry wall and slope protection maintenance, drilling and cleaning holes, anchor reinforcement, steel bar binding, curved surface formwork support, concrete pouring and concrete curing. Differentiated concrete construction methods are used for mesh construction working surfaces with twisted surfaces and inclined surfaces, and targeted formwork support and concrete pouring construction methods are carried out. Self-compacting concrete is applied to the twisted surface construction working surface. The self-flowing performance of the self-compacting concrete is utilized to reduce the dependence of concrete pouring on manual vibration, convert traditional vibration holes into concrete pouring holes, and realize the reuse of traditional formwork; continuous pouring of slipforms is carried out on inclined surfaces, reducing workers' high-altitude work, ensuring the compactness of the concrete structure, and improving construction safety.

Description

Technical Field

[0001] The invention relates to the field of building construction, in particular to a hanging mesh concrete construction method. Background Art

[0002] Mesh concrete construction technology is widely used in construction fields such as slope protection. Its core is to enhance the stability of the base surface through a composite structure of steel mesh and concrete.

[0003] Traditional mesh concrete construction techniques often use conventional formwork support combined with manual vibration. However, when working with special-shaped structures such as twisted and curved surfaces, the formwork is prone to slippage or deformation due to uneven force, resulting in poor concrete quality and a lack of targeted construction for the various curvatures of the work surfaces. Furthermore, insufficient vibration in areas with dense reinforcement can lead to defects such as honeycombs and voids, compromising the structural density and durability. Summary of the Invention

[0004] In view of the problems in the above or existing technologies that the degree of pertinence in treating the construction working surface is low and the structural density of the area where the concrete reinforcement is densely installed is easily reduced, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide a kind of hanging mesh concrete construction method.

[0006] In order to solve the above technical problems, the present invention provides the following technical solution, comprising the following steps:

[0007] Base surface cleaning: cleaning and leveling the construction area; base surface maintenance: repairing the walls in the construction area to ensure the integrity of the mortar masonry base surface; drilling and cleaning: using a drilling machine to open holes for anchor bars on the base surface of the construction area, and checking the hole depth and diameter after drilling; anchor bars and steel bar binding, using anchor glue to solidify the steel bars; formwork support: erecting the foundation frame required for concrete pouring in the construction area, and reserving vibration holes on the support formwork; concrete pouring and curing: pouring on the erected concrete frame, and curing after pouring;

[0008] The working area to be used for the mesh hanging construction is divided into a twisted construction working surface and an inclined construction working surface;

[0009] For the twisted construction working surface, in the formwork support step, the surface of the twisted construction working surface is supported by bakelite or bamboo plywood. Before the formwork support, the top formwork rods and tension screws set on the twisted construction working surface are first welded. The top formwork rods are set between the twisted construction working surface and the formwork. Positioning steel bars are inserted through holes in the concrete floor of the twisted construction working surface and then welded to the original anchor steel bars. In the concrete pouring and curing steps, self-compacting concrete is used to realize the pouring between the anchor steel bars and the support formwork.

[0010] For the inclined construction working surface, in the formwork support step, the side of the inclined construction working surface is supported by side formwork, and the side formwork includes two 8cm*4cm square steels; in the concrete pouring and curing step, a slipform machine is used for pouring, and the slipform machine includes four 20 channel steels, the width of the slipform machine is 80cm, the stroke length of the slipform machine is 6m, and a 3kW winch is installed on each side. The cover of the slipform machine is set on the side formwork on both sides of the inclined construction working surface, and the upper part of the slipform machine is hung on the steel piles at the top of the inclined construction working surface through the winch.

[0011] As a preferred solution of the mesh concrete construction method of the present invention, in which: in the formwork support step, vibration ports are set on the formwork, with one vibration port set every 2m, and the size of each vibration port is set to 50cm*50cm.

[0012] As a preferred solution of the mesh concrete construction method of the present invention, in the concrete pouring and curing steps for the twisted construction working surface, water is sprinkled before pouring to moisten the surface of the twisted construction working surface.

[0013] As a preferred embodiment of the mesh concrete construction method of the present invention, in the concrete pouring and curing steps for the inclined construction working surface, a vibrating rod is used manually to compact the concrete in the vibration mouth, a winch drives the slipform machine to move up 70 cm, and then concrete is poured and vibrated, and this process is repeated until the slipform machine reaches the highest point of the inclined construction working surface.

[0014] As a preferred solution of the mesh concrete construction method of the present invention, in which: for the base surface cleaning step, the working area to be meshed is cleaned and leveled, and the loose soil and scum on the wall slope are cleaned and removed using manual jackhammers, especially the mortar in the loose joints.

[0015] As a preferred solution of the mesh concrete construction method of the present invention, in which: for the base surface maintenance step, after the walls in the construction area are cleaned, the missing mortar masonry inside the wall is repaired and the loose stones on the wall are reinforced to ensure the integrity of the mortar masonry base surface.

[0016] As a preferred solution of the mesh concrete construction method of the present invention, in which: for the steps of drilling and cleaning holes, the positions and sizes of the holes to be drilled in the construction area are marked according to design requirements, and waterproofing treatment is performed in the holes to avoid water accumulation.

[0017] As a preferred solution of the mesh concrete construction method of the present invention, in which: for the step of anchor reinforcement and steel bar tying, the anchor reinforcement is set to a threaded steel bar with a diameter of 25 mm, and the intersection of every two anchor reinforcements is tied, and the intersection of the anchor reinforcement and the positioning reinforcement is tied at the same time.

[0018] As a preferred solution of the mesh concrete construction method of the present invention, in which: for the steps of concrete pouring and curing, the formwork or side formwork on the poured concrete is removed, and after sprinkling water, tarpaulin is covered to moisturize the concrete, and water is sprinkled regularly to keep the concrete surface moist.

[0019] The beneficial effects of the mesh concrete construction method of the present invention are as follows: differentiated concrete construction methods are used for the mesh construction working surfaces of twisted surfaces and inclined surfaces, targeted formwork support and concrete pouring construction methods are carried out, self-compacting concrete is applied to the twisted construction working surfaces, and the self-flowing properties of self-compacting concrete are utilized to reduce the dependence of concrete pouring on manual vibration, and traditional vibration holes are converted into concrete pouring holes, thereby realizing the reuse of traditional formwork; continuous pouring of the slipform machine is carried out on the inclined surface, reducing the high-altitude work of workers, ensuring the compactness of the concrete structure, and improving construction safety. The present invention utilizes the technical combination of "local measures" to match the optimal solution according to the different needs of twisted surfaces and inclined surfaces, thereby improving the service life, stability and density of the concrete after forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic diagram of steel bar bundling for a twisted construction working surface in a mesh concrete construction method according to the present invention.

[0022] Figure 2 This is a schematic diagram of the working of a slipform machine for an inclined construction working surface in a mesh concrete construction method of the present invention.

[0023] In the figure: 1. Twisted construction working surface; 11. Anchor steel bars; 12. Positioning steel bars; 2. Inclined construction working surface; 21. Slipform machine; 22. Winch. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] Example 1, reference Figure 1, which is the first embodiment of the present invention, provides a mesh concrete construction method, which performs targeted construction on a twisted construction working surface 1, can improve the compactness of the concrete forming layer, and reduce the dependence on manual vibration during the concrete forming process. The specific process includes base surface cleaning, mortar stone wall and slope protection maintenance, drilling and cleaning holes, anchor bars, steel bar binding, curved surface formwork support, concrete pouring and concrete curing. In the concrete pouring process, self-compacting concrete is used to improve the compactness of the concrete forming layer, reduce the dependence on manual vibration during the concrete forming process, and convert traditional vibration holes into concrete pouring holes, thereby realizing the reuse of traditional formwork.

[0026] In the base surface cleaning step, the construction workers first clean and level the construction area, use manual jackhammers to clean the loose soil and slag on the twisted construction working surface 1, especially the loose mortar joints must be cleaned, and the wall surface must be washed with high-pressure water to maintain a certain humidity.

[0027] In the mortar masonry wall and slope protection repair step, after the wall and slope protection of the twisted construction working surface 1 are cleaned, the missing mortar masonry stones are repaired and the loose stones are reinforced to ensure that the mortar masonry base surface is intact.

[0028] During the drilling process, mark the drill hole location and type according to the design requirements of the construction work surface. If other factors on the base surface affect drilling, the drill hole location can be adjusted appropriately. Drilling is performed using a digging drill. Where the machine cannot reach, holes are drilled manually using an electric hammer or pneumatic drill. The digging drill can drill holes 50-60 cm deep and complete one hole in half a minute. The digging drill is easy to move and has high drilling efficiency, reducing safety risks for workers working at height and eliminating the need for scaffolding, thus saving costs. Drill holes more frequently in areas where the formwork is subject to high stress, with a spacing of 60-80 cm.

[0029] During the hole cleaning step, after drilling is completed, workers check the hole depth and diameter for compliance. They then use an air compressor to blow out any dust inside the hole. They then use a brush to clean the hole walls and blow the hole again with compressed air. This process should be repeated 3 to 5 times until the hole is free of dust and debris. Finally, they wipe the hole walls clean with a cotton cloth dipped in acetone and temporarily seal the hole opening. If there are any unused holes, clean them and fill them with anchoring adhesive. After cleaning, protect the hole to prevent rainwater and debris from entering. Keep an eye on the weather forecast and cover the hole with a tarpaulin before it rains. If rainwater enters the hole, it must be cleaned up, as this will affect the bonding of the anchoring adhesive. If water does enter, use a thin sponge to clean any accumulated water from the hole.

[0030] In the step of anchoring the steel bars, threaded steel bars with a diameter of 25 are used for anchoring the steel bars. The rust and oil stains within the anchoring length of the steel bars are cleaned and polished to a metallic luster. The steel bars are inserted into the holes by rotation or hammering. When hammering with a hammer, one hand should hold the steel bar or bolt to ensure alignment and avoid rebound. The amount of anchoring glue filling should ensure that a small amount of glue overflows around the steel bar after insertion. The exposed part of the anchor rod steel bar 11 should be reserved in length according to the laid line. The mortar masonry base surface is uneven and cannot be reserved based on it. The anchoring glue needs to be cured. The anchor rod steel bar 11 must not be disturbed within 12 hours when the daily average temperature is above 25℃, and the anchor rod steel bar 11 must not be disturbed within 24 hours when the daily average temperature is below 25℃. If there is a large disturbance, the anchor rod steel bar 11 should be relocated.

[0031] During the rebar tying process, the rebar must be strictly constructed according to the drawings, especially the reserved cover. The height of the horse stool should be adjusted according to the laid line to reserve space for the vibrator to move for the subsequent concrete pour. All intersections of the rebar must be tied, and no skipping is allowed. The anchor bars 11 on the torsion surface will inevitably be stepped on during the formwork support process, and skipping will increase the risk of deformation. The intersection of the anchor bars 11 and the positioning bars 12 must also be tied.

[0032] In the steps of supporting the curved surface formwork, the twisted surface formwork is supported by using bakelite or bamboo plywood. Before supporting the formwork, the top rod and the tension screw are first welded. The tension screw is welded to the anchor steel bar 11 located at the top of the construction surface for positioning. The main tensile force of the formwork during operation is provided by it, and the welding stability of the anchor steel bar 11 must be guaranteed. The welding of the top rod is mainly to ensure the thickness of the protective layer between the formwork and the binding steel bars, so the top rod must be welded with a good line. The key point is the reinforcement at the bottom of the formwork, where the formwork is subjected to the greatest force and the formwork is most likely to run. The positioning steel bars 12 can be inserted by drilling holes in the concrete bottom plate and then welded to the anchor steel bar 11 to reinforce the formwork. The support formwork should reserve a vibration port in the middle part, one every two meters, with a size of 50*50cm. The main function is to insert a pump pipe into the vibration port to pour concrete, and to insert a vibrating rod into the vibration port to vibrate the concrete, reducing the concrete's dependence on manual vibration, while reducing the existence of vibration blind spots and reducing bubbles and honeycombs inside the concrete forming layer.

[0033] During the concrete pouring process, sprinkle water to moisten the silo surface before pouring. Use self-compacting concrete, which has better fluidity, allowing it to flow more easily between the rebar and the formwork, reducing the risk of loose stones. The concrete pouring speed must be slow; a fast pour can easily lead to formwork explosion. As long as cold joints are avoided, the pouring speed can be set to the slowest. When pouring at the vibrating opening, seal it in advance.

[0034] After the concrete pouring is completed and the concrete is tensely removed from the formwork, it can be sprinkled with water and covered with tarpaulin to keep it warm and moist. A designated person should sprinkle water frequently to keep the concrete surface moist. The maintenance of the concrete determines the service life of the concrete in the later stage.

[0035] Example 2, reference Figure 2 This is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a mesh concrete construction method for the inclined construction working surface 2, which solves the problem of slipform concrete pouring on the conventional inclined construction working surface 2. The specific process includes base surface cleaning, mortar stone slope protection maintenance, drilling, hole cleaning, anchor reinforcement, steel bar binding, side formwork support, concrete pouring and concrete curing.

[0036] The workflow that differs from Example 1 is as follows: The formwork support process mainly supports the side formwork. The side formwork is made of two 8*4cm square steels spliced together and fixed in the position determined by the layout.

[0037] The concrete pouring process utilizes a slipform machine 21. Made from four welded 20-gauge channel steel bars, it measures 80 cm wide and 6 meters long, with a 3kW winch 22 mounted on each side. The slipform machine 21 rests on the two side forms, with the upper portion of the winch 22 suspended from fixed steel piles. Concrete is poured beneath the slipform machine 21 and manually vibrated with a vibrator. Pressing the winch 22 switch causes the slipform machine 21 to rise 70 cm, and concrete is poured and vibrated again. This cycle continues until the top of the slope. This technology requires high control over the concrete slump, which should be kept between 90 and 120 mm. Excessive slump can easily cause the concrete to overflow from under the slipform machine 21; too little slump can make it difficult to vibrate and compact, compromising concrete quality.

[0038] Furthermore, in the specific working process, the models of anchor drilling equipment include WG-45A, WG-45B, WG-45C and WG-45D. The four types of equipment are suitable for rock hardness of f=6-18, the single-rod drilling depth is 3.2 meters, and the weight of the whole machine is 1000kg. The rock drill models matched with the four types of equipment include HYD200, HYD300, HC20 and DF530. Among them, the equipment manufacturer of HYD200 and HYD300 is Lianhuashan, China, with impact power of 7kW and 15kW respectively, impact frequency of 34-67Hz and 50Hz, impact pressure of 16-19MPa, impact flow rate of 45L / min and 65L / min, and the equipment manufacturer of HC20 is MONTABERT, France, with impact power of 4.5kW, impact frequency of 50Hz, impact pressure of 16-19MPa, impact flow rate of 45L / min and 65L / min. The impact pressure is 14 MPa, the impact flow rate is 45 L / min, and the DF530 equipment is manufactured by DOOFOR of Finland. The impact power is 10 kW, the impact frequency is 60 Hz, the impact pressure is 10-13 MPa, and the impact flow rate is 45-55 L / min. The deslagging gas volume of the above four devices is 3.0 m³ / min, and the deslagging gas pressure is 6-10 bar. Practical drill rod specifications include radii of 25 mm, 32 mm, and 28 mm, and the drilling diameter covers 32 mm to 64 mm. The excavator used is larger than 8 tons. During the construction of the slipform machine 21, optional rock drilling equipment such as the WG-45 series can be used. It is suitable for rock hardness f = 6-18 and drilling depth of 3.2 m. Specific parameters are adjusted according to project requirements.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for constructing mesh concrete, comprising the following steps: Clean the base surface and level the construction area; Base surface maintenance: repair the walls in the construction area to ensure the integrity of the mortar masonry base surface; Drilling and cleaning holes: Use a drilling machine to open holes for anchor bars on the base surface of the construction area, and check the hole depth and diameter after drilling is completed; Anchor the steel bars and tie them together, and use anchor glue to solidify the steel bars; Formwork support: erect the foundation frame required for concrete pouring in the construction area, and reserve vibration openings on the support formwork; Concrete pouring and curing: pouring is carried out on the erected concrete frame, and curing is carried out after pouring is completed; Its characteristics are: The working area to be constructed by hanging the mesh is divided into a twisted construction working surface (1) and an inclined construction working surface (2), and the construction is carried out separately, wherein the twisted construction working surface (1) adopts a self-compacting concrete pouring method, and the inclined construction working surface (2) adopts a slipform concrete pouring method; For the twisted construction working surface (1), in the formwork support step, the surface of the twisted construction working surface (1) is supported by using a plywood board or a bamboo plywood board. Before the formwork support, a top formwork rod and a tension screw rod set on the twisted construction working surface (1) are first welded. The top formwork rod is set between the twisted construction working surface (1) and the formwork. A hole is drilled in the concrete floor of the twisted construction working surface (1) to insert a positioning steel bar (12), which is then welded to the original anchor steel bar (11). In the concrete pouring and curing step, self-compacting concrete is used to realize pouring between the anchor steel bar (11) and the supporting formwork. For the inclined construction working surface (2), in the formwork support step, the side of the inclined construction working surface (2) is supported by a side formwork, and the side formwork includes two 8cm*4cm square steels; in the concrete pouring and curing step, a slipform machine (21) is used for pouring, and the slipform machine (21) includes four 20 channel steels, the width of the slipform machine (21) is 80cm, the stroke length of the slipform machine (21) is 6m, and a 3kW winch (22) is installed on each side. The cover of the slipform machine (21) is set on the side formwork on both sides of the inclined construction working surface (2).

2. The method for constructing mesh concrete according to claim 1, wherein: In the formwork support step, vibration ports are set on the formwork, with one vibration port set every 2m, and the size of each vibration port is set to 50cm*50cm.

3. The method for constructing mesh concrete according to claim 1 or 2, characterized in that: In the concrete pouring and curing steps of the twisted construction working surface (1), water is sprinkled before pouring to moisten the surface of the twisted construction working surface (1).

4. The method for constructing mesh concrete according to claim 3, wherein: During the concrete pouring and curing steps of the inclined construction working surface (2), a vibrating rod is used manually to compact the concrete in the vibrating opening, and the winch (22) drives the slipform machine (21) to move up 70 cm, and then concrete is poured and vibrated, and this process is repeated until the slipform machine (21) reaches the highest point of the inclined construction working surface (2).

5. The method for constructing mesh concrete according to claim 4, characterized in that: Regarding the base surface cleaning step, the working area where the mesh is to be hung should be cleaned and leveled, and the loose soil and scum on the wall slope should be removed, especially the mortar in the loose joints.

6. The mesh concrete construction method according to claim 5, characterized in that: Regarding the base surface maintenance steps, after the walls in the construction area are cleaned, the missing mortared stones inside the wall are repaired and the loose stones on the wall are reinforced to ensure the integrity of the mortared stone base surface.

7. The method for constructing mesh concrete according to claim 6, wherein: For the drilling and hole cleaning steps, mark the location and size of the holes to be drilled in the construction area according to the design requirements.

8. The method for constructing mesh concrete according to claim 7, wherein: In the steps of drilling and cleaning holes, the formed holes are waterproofed and dried.

9. The method for constructing mesh concrete according to claim 8, wherein: In the step of anchoring and tying the reinforcement bars, the anchor reinforcement bars (11) are set to be threaded steel bars with a diameter of 25 mm, and the intersection of every two anchor reinforcement bars (11) is tied, and the intersection of the anchor reinforcement bars (11) and the positioning reinforcement bars (12) are tied at the same time.

10. The mesh concrete construction method according to claim 9, characterized in that: Regarding the steps of concrete pouring and curing, the formwork or side formwork on the poured concrete should be removed, and after sprinkling water, the concrete should be covered with tarpaulin to moisturize it. Water should be sprinkled regularly to keep the concrete surface moist.

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