Large-inclination concrete inclined plate double-side die assembly device

Abstract

The utility model provides a kind of big dip angle concrete inclined plate double-side die assembly, belong to hole body inner wall formwork construction technical field, the big dip angle concrete inclined plate double-side die assembly includes symmetrically arranged left side die assembly formwork and right side die assembly formwork, and the inside of left side die assembly formwork and right side die assembly formwork is all through spray glue joint has water-permeable formwork cloth;Water-permeable formwork cloth's joint part position uses lap joint to lay, and lap joint part is after cutting processing to guarantee surface flatness;Left side die assembly formwork and right side die assembly formwork are all set with exhaust hole;Elastic rubber plug is installed in exhaust hole, and elastic rubber plug main part is the cylindrical structure compatible with exhaust hole, and elastic rubber plug axial is set with through exhaust passage;Exhaust hole is equidistantly distributed according to group, and the number of each group exhaust hole is 4, and the distance between each group adjacent exhaust hole is not less than 20cm;The utility model can solve the problem that water vapor and bubble are not completely discharged in the construction process of big dip angle concrete inclined plate.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel interior wall formwork construction technology, specifically, it relates to a double-sided formwork closing device for a large-angle concrete inclined slab. Background Technology

[0002] In infrastructure projects such as large-scale low-speed wind tunnel construction, spillways of water conservancy projects, and bearing pads of large bridges, steeply inclined concrete slabs are key structural components, and their construction quality directly determines the overall performance and service life of the project. Taking large-scale low-speed wind tunnel projects as an example, the airflow field inside the wind tunnel has extremely high requirements for the flatness and density of the concrete surface. If there are defects such as pits or air bubbles on the surface of the inclined slab, it will lead to airflow turbulence and affect the accuracy of wind tunnel test data. Therefore, the construction of steeply inclined concrete slabs requires strict control over the surface forming quality and internal density. In the current technical field, the construction of steeply inclined concrete slabs generally adopts a double-sided formwork process. However, this process faces multiple technical challenges in actual operation, specifically in the following aspects: The inefficient removal of water vapor and air bubbles easily leads to surface defects. Under double-sided formwork conditions, a large amount of water vapor is generated inside the concrete after pouring. At the same time, air is easily entrained during vibration, forming air bubbles. The steep angle structure makes it difficult for water vapor and air bubbles to rise and be discharged naturally. If only traditional formwork construction is relied upon, water vapor easily accumulates at the contact surface between the formwork and the concrete, forming a negative pressure zone. After demolding, irregular pits with a diameter of 10-50cm are likely to appear. Even if permeable cloth is used to assist in air removal, the permeable cloth can only guide surface water vapor. In steep angle construction, it is easy to shift due to insecure fixing, resulting in the failure of water permeability at the joints. It still cannot completely solve the problem of deep air bubble residue. Utility Model Content

[0003] In view of this, the present invention provides a double-sided formwork device for inclined concrete slabs with large inclination angles, which can solve the problem of incomplete removal of water vapor and air bubbles during the construction of inclined concrete slabs with large inclination angles.

[0004] This utility model is implemented as follows: This utility model provides a double-sided formwork device for a large-angle concrete slab, comprising a symmetrically arranged left and right formwork templates. The inner sides of both the left and right formwork templates are bonded with permeable formwork fabric via adhesive spraying. The seams of the permeable formwork fabric are laid with overlaps, and the overlaps are trimmed to ensure a smooth surface. Both the left and right formwork templates have vent holes. An elastic plug is installed inside each vent hole. The elastic plug has a cylindrical structure adapted to the vent hole, and an axially extending venting channel is formed within the elastic plug.

[0005] The technical effects of the double-sided formwork device for a large-angle concrete slab provided by this utility model are as follows: By setting a permeable formwork cloth on the surface of the double-sided formwork, the surface water vapor of the concrete is initially diverted. Combined with the vent holes opened on the surface of the formwork, the air bubbles / water vapor between the formwork and the concrete are directionally discharged. By setting an elastic rubber plug, the concrete slurry can be prevented from directly blocking the vent holes. This breaks the traditional single mode of relying solely on permeable cloth for venting and establishes a dual water vapor discharge path of surface permeability combined with directional venting. This fundamentally reduces the residual air bubbles, lays the foundation for subsequent optimization, and solves the problem of surface pitting caused by undischarged air bubbles.

[0006] Based on the above technical solution, the double-sided formwork closing device for a large-angle concrete inclined slab of this utility model can be further improved as follows: The exhaust holes are distributed in groups at equal intervals, with 4 exhaust holes in each group. The distance between adjacent exhaust holes in each group is not less than 20cm, and the diameter of each group is not greater than 8mm.

[0007] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by further limiting the vent holes to be distributed in groups at equal intervals, it is ensured that the vent holes are evenly covered on the surface of the mold closing template, avoiding the accumulation of air bubbles caused by the absence of vent holes in some areas; the vent hole spacing of ≥20cm is used to balance the venting density and maintain the strength of the mold closing template; the vent hole diameter of ≤8mm is used to avoid the impact of slurry leakage on the molding quality, and further reduce the risk of pits caused by uneven venting or slurry leakage.

[0008] Furthermore, the outer wall of the elastic rubber plug is provided with two annular sealing protrusions, which are interference-fitted with the inner wall of the vent hole, and at the same time, water vapor is guided out through the axial venting channel to prevent concrete slurry from seeping in.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the two annular sealing protrusions achieve a tight fit between the elastic rubber plug and the inner wall of the vent hole, preventing concrete slurry from seeping in through the gap between the elastic rubber plug and the vent hole wall; the axially opened venting channel ensures that water vapor can still be discharged in a directional manner, forming a double guarantee.

[0010] Furthermore, a fast-drying adhesive is used.

[0011] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: using quick-drying spray adhesive can fix the permeable template cloth immediately after spraying, avoiding the permeable cloth from slipping or shifting due to the adhesive not drying during construction at large angles.

[0012] Furthermore, the material of the permeable template fabric is a permeable polyester fiber material.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the permeable template fabric made of polyester fiber permeable material has a higher permeability than ordinary fabric, and is resistant to the alkaline corrosion of concrete, and can maintain its permeability for a long time.

[0014] Furthermore, the thickness of the permeable formwork fabric is 1-2mm to ensure permeability without affecting the accuracy of concrete molding.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by designing a thickness of 1-2mm, it is ensured that the permeable template fabric has sufficient permeable pores (when the thickness is <1mm, the pores are insufficient and the permeability is poor; when it is >2mm, it is easy to be compressed and deformed, affecting the flatness of the concrete surface); at the same time, it can ensure that the molding accuracy is not affected and balance the permeability requirements and the quality of the concrete surface.

[0016] Furthermore, the vent holes are evenly arranged along the height direction of the left and right mold closing templates, and the axis of the vent holes is perpendicular to the template surface.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the vent holes are evenly arranged along the height direction to ensure that there are vent holes throughout the entire height range of the template from bottom to top, avoiding the accumulation of air bubbles in the upper area due to the lack of vent holes; the axis is perpendicular to the template surface to ensure smooth venting channels and reduce resistance when water vapor is discharged.

[0018] Furthermore, the materials for the left and right mold-closing templates are bamboo plywood or steel templates.

[0019] Furthermore, the overlap width of the seams of the permeable template fabric is 5-10cm.

[0020] Furthermore, the exhaust channel consists of a first cylindrical section and a second cylindrical section from the inside of the exhaust hole to the outside. The outer wall of the first cylindrical section is coated with a waterproof adhesive layer, which is used to fix it to the inner section of the exhaust hole. The second cylindrical section has multiple exhaust grooves evenly opened around its circumference. The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the water vapor is discharged from the outside of the template through the second cylindrical section exhaust groove by the segmented exhaust channel, and the stepped structure can prevent grout leakage and also prevent the rubber plug from being completely embedded in the exhaust hole.

[0021] Compared with existing technologies, the beneficial effects of the double-sided formwork device for large-angle concrete slabs provided by this utility model are as follows: By combining the formwork template with a permeable template cloth, and with the design of opening vent holes on the surface and having built-in elastic rubber plugs, dual venting of the surface and deep layers is achieved, completely eliminating surface pits and meeting the high requirements of large low-speed wind tunnels for concrete flatness; in terms of grout leakage prevention performance, the vent holes with a diameter of less than 8mm, combined with the rubber plug ring sealing protrusion, effectively block grout leakage and avoid honeycomb and pitting defects; in terms of adaptability and stability, the 30°-60° inclination angle adaptability range and the quick-drying spray adhesive fixed polyester fiber permeable cloth ensure that the device does not shift or deform in large-angle scenarios, while the 5-10cm overlap cutting design further ensures surface flatness, improving overall construction efficiency and concrete forming quality, and providing reliable technical support for similar projects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a double-sided formwork closing device for a large-angle concrete inclined slab. Figure 2 This is a schematic diagram of the interior of the vent holes on the mold closing template; Figure 3 This is a top view of the mold closing template. The attached diagram lists the components represented by each number as follows: 10. Left mold closing template; 11. Right mold closing template; 12. Permeable template fabric; 13. Vent hole; 14. Elastic rubber plug; 15. Vent channel; 151. First cylindrical section; 152. Second cylindrical section; 16. Annular sealing protrusion; 17. Waterproof adhesive layer. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] Example 1: As Figure 1-3The image shows a first embodiment of a double-sided formwork device for a large-angle concrete slab provided by this utility model. In this embodiment, it includes a left formwork template 10 and a right formwork template 11 symmetrically arranged. The inner sides of both the left and right formwork templates are bonded with permeable template fabric 12 by spray adhesive. The seams of the permeable template fabric are laid with overlaps, and the overlaps are trimmed to ensure a smooth surface. Vent holes 13 are provided on both the left and right formwork templates. An elastic plug 14 is installed in the vent hole. The main body of the elastic plug is a cylindrical structure adapted to the vent hole, and the elastic plug has an axially through venting channel 15.

[0026] The inclination angle between the left and right formwork panels ranges from 30° to 60°. By limiting the inclination angle, the device is clearly adapted to large-angle construction scenarios, ensuring that the formwork can stably support the concrete, and that the positions of the permeable cloth and vent holes will not fail due to excessive or insufficient inclination angle.

[0027] In the above technical solution, the exhaust holes are distributed in groups at equal intervals, with 4 exhaust holes in each group. The distance between adjacent exhaust holes in each group is not less than 20cm, and the diameter of the holes is not greater than 8mm.

[0028] Furthermore, in the above technical solution, the outer wall of the elastic rubber plug is provided with two annular sealing protrusions 16. The annular sealing protrusions are press-fitted with the inner wall of the vent hole, and water vapor is guided out through the axial venting channel to prevent concrete slurry from seeping in.

[0029] Furthermore, in the above technical solution, the adhesive used is a fast-drying adhesive.

[0030] Furthermore, in the above technical solution, the material of the permeable template fabric is a polyester fiber permeable material.

[0031] Furthermore, in the above technical solution, the thickness of the permeable template fabric is 1-2mm to ensure the permeability effect without affecting the concrete forming accuracy.

[0032] Furthermore, in the above technical solution, the vent holes are evenly arranged along the height direction of the left and right mold closing templates, and the axis of the vent holes is perpendicular to the template surface.

[0033] Furthermore, in the above technical solution, the materials of the left mold closing template and the right mold closing template are bamboo plywood or steel template.

[0034] Furthermore, in the above technical solution, the overlap width of the seam of the permeable template fabric is 5-10cm.

[0035] Furthermore, in the above technical solution, the exhaust channel consists of a first cylindrical section 151 and a second cylindrical section 152, which are located from the inside of the exhaust hole to the outside. The outer wall of the first cylindrical section is coated with a waterproof adhesive layer 17, which is fixed to the inner section of the exhaust hole through the adhesive layer. The second cylindrical section has multiple exhaust grooves evenly opened around its circumference. The usage process of this utility model is as follows: Specifically, first, select the left and right mold-closing templates according to the inclined plate design requirements (the material is bamboo plywood or steel template, and the thickness is determined according to the size of the inclined plate, generally 15-20mm); prepare polyester fiber permeable template cloth (thickness 1-2mm, width adapted to template height); quick-drying concrete permeable template cloth special spray adhesive (approximately 100-150g per square meter); elastic rubber plug (the main body diameter is adapted to the vent hole, with axial vent channel, and two annular sealing protrusions on the outside, with a protrusion height of 0.5mm and a spacing of 3mm); handheld electric drill (equipped with an 8mm diameter drill bit), steel ruler (accuracy 1mm), scissors (sharp blade, used for cutting permeable cloth), level, and total station (used to locate the template inclination angle).

[0036] Determine the inclined plate angle (30°-60°), template dimensions (length consistent with the inclined plate, height divided according to the pouring section, generally 1.5-2m) and venting hole distribution rules (evenly arranged along the template height, set in groups of 4, with a spacing of ≥20cm between adjacent holes within a group, and the spacing between groups matching the template height) based on the construction drawings.

[0037] Vent hole opening: Place the template flat on a flat ground and mark the hole positions according to the preset rules with a steel ruler (the marking points must be clear and the error ≤1mm); replace the hand drill with an 8mm drill bit and drill the hole perpendicular to the template surface (keep the drill stable during drilling to avoid tilting the hole, and the hole diameter ≤8mm); after drilling, use a brush to clean the wood chips and other debris in the hole to ensure that the hole is unobstructed. Template cleaning: Wipe the inside of the template (the side in contact with concrete) with a cloth to remove dust, oil, and other impurities, ensuring a firm bond with the adhesive. Adhesive spraying and rolling: Evenly spray the quick-drying adhesive onto the cleaned inside of the template (0.1-0.2mm thickness, with no missed spots or accumulation). Immediately after spraying, cover the inside of the template with the permeable template fabric and roll it from the center outwards with a roller (with uniform rolling pressure to ensure a tight fit between the fabric and the template, without bubbles or wrinkles). Seaming and Cutting: If a single sheet of permeable fabric cannot cover the entire template, seaming is required. The overlap width of adjacent permeable fabrics should be controlled at 5-10cm. After overlapping, use scissors to cut off the excess corners of the overlap (after cutting, the overlap should be flush with the template surface and without protrusions). At the same time, cut off the excess permeable fabric at the edge of the template to ensure that the edge of the fabric is aligned with the edge of the template. Installation of the elastic rubber plug: Align one end of the elastic rubber plug (the end with the annular sealing protrusion) with the vent hole of the template, gently press and rotate the rubber plug (rotation angle ≤ 90°) until the annular sealing protrusion of the rubber plug fits tightly with the inner wall of the vent hole (interference fit, no looseness); after installation, check the axial venting channel of the rubber plug to ensure that the channel is not blocked and that water vapor can be discharged normally.

[0038] Inclination Angle Positioning: Based on the construction drawings, use a total station to determine the inclination angle of the inclined plate (e.g., 45°). Erect a formwork support frame in the construction area (the support frame is made of steel pipe, and its strength must meet the requirements of concrete lateral pressure). symmetrically hoist the left and right formwork onto the support frame, and use a level to calibrate the inclination angle of the formwork to ensure that the inclination angle error is ≤0.5°. Fixing and Reinforcement: Connect and fix the formwork to the support frame with bolts (bolt spacing ≤ 50cm, tighten evenly to avoid formwork deformation); add diagonal support rods on the outside of the formwork (the angle between the support rod and the formwork is 45°) to further enhance the stability of the formwork and prevent it from shifting during pouring. Concrete Pouring and Curing Pouring and Vibration: Prepare concrete according to the concrete construction specifications (slump adjusted according to the inclination angle of the inclined slab, generally 120-150mm), and pour the concrete into the cavity between the two side formworks using a pump; during the pouring process, use an immersion vibrator to vibrate (vibration point spacing ≤30cm, vibration time 15-20s, avoid over-vibration and under-vibration), and at the same time observe the vent holes. If water vapor is discharged from the vent channel of the rubber plug, it indicates that the venting is normal; if the vent channel is blocked, the rubber plug should be replaced in time. Curing and Formwork Removal: After the concrete is poured, cover it with geotextile and water it for curing according to the specifications (curing time ≥7 days, keep the geotextile moist); after the curing period, remove the formwork support frame first, and then remove the formwork on both sides (the formwork removal order is to remove the outer formwork first, and then the inner formwork to avoid damaging the concrete surface); after the formwork is removed, check the surface quality of the inclined plate to confirm that there are no defects such as pits or honeycombs.

[0039] Example 2: Based on Example 1, taking the construction scenario of a large low-speed wind tunnel with a 45° inclined slab as an example, the inclined slab of the large low-speed wind tunnel is 10m long, 2m high, and has an inclination angle of 45°. The concrete design strength grade is C30, and the surface flatness error is required to be ≤2mm / m. The formwork uses 18mm thick bamboo plywood (one piece on each side, 10m × 2m in size); the permeable formwork fabric is 1.5mm thick polyester fiber material; the elastic rubber plug has a main body diameter of 8mm, an axial exhaust channel diameter of 2.5mm, and two annular sealing protrusions on the outside (0.5mm high, 3mm apart); the exhaust holes are arranged along the height of the formwork in groups of 4, with a spacing of 25cm within each group and 50cm between groups. Following the above construction process, water vapor continuously exits from the exhaust holes during concrete pouring, with no grout leakage; after demolding, the surface of the inclined slab is flat, without pits of 10-50cm in size, and the surface flatness error is 1.2mm / m, meeting the wind tunnel engineering design requirements.

[0040] Example 3: Based on Example 1, taking the construction scenario of a 30° inclined spillway slab at a water conservancy project as an example, the inclined spillway slab is 15m long, 3m high, and has an inclination angle of 30°. The concrete design strength grade is C35, and the required impermeability grade is P6. 20mm thick steel formwork is used (one on each side, 15m × 3m in size); the permeable formwork fabric is 2mm thick polyester fiber material; the elastic rubber plug has a main body diameter of 7.5mm, the axial venting channel diameter is 2mm, and three venting grooves (1mm wide, 0.5mm deep) are opened circumferentially on the second cylindrical section; venting holes are arranged in groups of four, with a spacing of 20cm within each group and 60cm between groups, along the height of the formwork. During construction, the venting grooves of the elastic rubber plug and the axial channel work together to vent air, and no air bubbles remain after concrete vibration; after curing and demolding, the surface of the inclined slab is dense, and the impermeability test meets the P6 requirement, with no leakage points and a surface defect rate of 0%.

[0041] Specifically, the principle of this utility model is as follows: First, symmetrically arranged mold templates provide stable support for the concrete. Second, quick-drying spray adhesive is used to tightly bond the permeable polyester fiber fabric to the inside of the template, utilizing the permeability of the fabric to drain surface moisture. The overlapping and cutting of the seams ensure no leakage channels. Third, 8mm diameter vent holes are distributed in groups at equal intervals (spacing ≥ 20cm), and elastic rubber plugs with axial channels are used. The rubber plugs prevent grout leakage by interfering with the hole wall through the annular sealing protrusion. At the same time, the vent channels (including the design of multiple vent grooves) directionally discharge deep air bubbles. Finally, the vent holes are evenly arranged along the height and the axis is perpendicular to the template, ensuring no vent blind spots in the entire area. All components work together to achieve efficient water vapor discharge and no grout leakage, ultimately casting a high-quality large-angle concrete slab.

Claims

1. A double-sided formwork closing device for a large-angle concrete inclined slab, characterized in that, The system includes symmetrically arranged left and right mold-closing templates. The inner sides of both templates are bonded with permeable template fabric using adhesive spraying. The seams of the permeable template fabric are laid with overlaps, and the overlaps are trimmed to ensure a smooth surface. Both the left and right mold-closing templates have vent holes. Elastic plugs are installed inside the vent holes. The main body of the elastic plug is a cylindrical structure that fits the vent hole, and the elastic plug has an axially through-venting channel.

2. The double-sided formwork closing device for a large-angle concrete inclined slab according to claim 1, characterized in that, The exhaust holes are distributed in groups at equal intervals, with 4 exhaust holes in each group. The distance between adjacent exhaust holes in each group is not less than 20cm, and the diameter of each group is not greater than 8mm.

3. The double-sided formwork closing device for a large-angle concrete inclined slab according to claim 2, characterized in that, The outer wall of the elastic rubber plug is provided with two annular sealing protrusions. The annular sealing protrusions are press-fitted with the inner wall of the vent hole, and water vapor is guided out through the axial venting channel to prevent concrete slurry from seeping in.

4. The double-sided formwork closing device for a large-angle concrete inclined slab according to claim 3, characterized in that, The adhesive used is a fast-drying type.

5. A double-sided formwork closing device for a large-angle concrete inclined slab according to claim 4, characterized in that, The permeable template fabric is made of permeable polyester fiber material.

6. A double-sided formwork closing device for a large-angle concrete inclined slab according to claim 5, characterized in that, The thickness of the permeable formwork fabric is 1-2mm to ensure permeability without affecting the accuracy of concrete molding.

7. A double-sided formwork closing device for a large-angle concrete inclined slab according to claim 6, characterized in that, The vent holes are evenly arranged along the height direction of the left and right mold closing templates, and the axis of the vent holes is perpendicular to the template surface.

8. A double-sided formwork closing device for a large-angle concrete inclined slab according to claim 7, characterized in that, The left and right mold-closing templates are made of bamboo plywood or steel.

9. A double-sided formwork closing device for a large-angle concrete inclined slab according to claim 8, characterized in that, The overlap width of the seams of the permeable template fabric is 5-10cm.

10. A double-sided formwork closing device for a large-angle concrete inclined slab according to claim 9, characterized in that, The exhaust channel consists of a first cylindrical section and a second cylindrical section from the inside of the exhaust hole to the outside. The outer wall of the first cylindrical section is coated with a waterproof adhesive layer, which is used to fix it to the inner section of the exhaust hole. The second cylindrical section has multiple exhaust grooves evenly distributed around its circumference.

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