Permeable formwork system suitable for underwater mass concrete pouring

Abstract

The utility model provides a water-permeable formwork system suitable for underwater mass concrete pouring. The water-permeable formwork system comprises a water-permeable formwork framework, a steel wire mesh and a tie bar supporting assembly. The permeable formwork framework comprises a three-face bottom water-passing steel reinforcement framework formwork composed of three side faces and a bottom face. The steel wire mesh is laid on the three side faces and the bottom face and fixed to the three side faces and the bottom face. The tie bar supporting assembly comprises a plurality of diagonal tie bars used for connecting the bottom face and the side faces, and a locally-stable triangular rigid connection structure is formed. The permeable formwork system suitable for underwater mass concrete pouring has the advantages that the construction difficulty is reduced, the safety is improved, the adaptability is higher, the forming quality is better, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field of construction concrete formwork, and specifically, it relates to a permeable formwork system suitable for underwater mass concrete pouring. Background Technique

[0002] In underwater engineering construction, concrete pouring is a key technology, and its quality directly affects the overall quality and safety of the project. However, due to the special underwater environment, concrete pouring faces many challenges, such as the great difficulty in formwork fabrication and installation, and high risks in underwater installation operations. Therefore, designing and manufacturing a permeable formwork system suitable for underwater mass concrete pouring is of great significance for improving the quality and efficiency of concrete pouring.

[0003] The existing solutions mainly use traditional steel-wood combined formwork and ton-bag formwork.

[0004] The first type of underwater steel-wood combined formwork: Due to underwater construction, with deep water and poor water quality, the underwater installation workload is large, the underwater formwork installation is difficult, and the underwater installation risk is high.

[0005] The second type is ton-bag formwork: The formwork is erected underwater through ton-bags, and it can only be used for the repair of damaged parts of the tail bay of a hydropower station. Since the underwater installation of ton-bags is irregular, it is very difficult to ensure the appearance dimensions and pouring quality of underwater concrete.

[0006] The third type is steel sheet pile / steel pipe pile formwork: This type of formwork is only suitable for installation or caisson construction, not suitable for mass underwater concrete pouring, and the construction cost is relatively high.

[0007] Generally speaking, the current situation of formwork for underwater mass concrete pouring mainly faces the following problems: First, the formwork fabrication and installation are difficult, requiring complex operations underwater, which increases the complexity and difficulty of construction; second, the risk of underwater installation operations is high, and due to the complex and changeable underwater environment, construction safety is difficult to guarantee; third, the adaptability of the formwork is poor, and it can only be used for specific engineering projects and cannot be widely applied to different underwater concrete pouring scenarios; fourth, it is difficult to guarantee the forming quality of concrete. Due to the poor sealing performance of the formwork, concrete is prone to leakage and loss. Content of the Utility Model

[0008] The purpose of the utility model is to overcome the deficiencies of the prior art, and thus provide a permeable formwork system suitable for underwater mass concrete pouring with reduced construction difficulty, improved safety, stronger adaptability, better forming quality, and lower cost.

[0009] To achieve the above object, the technical solution adopted by the present utility model is: a permeable formwork system applicable to underwater mass concrete pouring, comprising a permeable formwork skeleton, a wire mesh and a tension bar support assembly;

[0010] The permeable formwork skeleton comprises a three-sided bottomed water-passing steel bar skeleton formwork composed of three sides and a bottom surface;

[0011] The wire mesh is laid on and fixed to the three sides and one bottom surface;

[0012] The tension bar support assembly comprises a plurality of diagonal tension bars for connecting the bottom surface and each side surface, forming a locally stable triangular rigid connection structure.

[0013] Preferably, in the external dimensions of the permeable formwork skeleton, the width ≥ 15 m, the length ≥ 20 m, and the height is between 2 m and 3.8 m.

[0014] Preferably, the side skeleton of the permeable formwork skeleton is welded into a mesh by HRB hot-rolled ribbed steel bars. Among them, the diameter of the vertical steel bars ≥ 25 mm, the horizontal steel bars ≥ 20 mm, and the spacing between the vertical and horizontal steel bars ≥ 20 cm.

[0015] Preferably, the bottom skeleton of the permeable formwork skeleton is welded into a mesh by HRB hot-rolled ribbed steel bars. Among them, the diameter of the horizontal steel bars ≥ 12 mm, the diameter of the longitudinal steel bars ≥ 20 mm, and the spacing between the vertical and horizontal steel bars ≥ 20 cm.

[0016] Preferably, the horizontal steel bars at both ends of the bottom skeleton of the permeable formwork skeleton are provided with 90° hooks for connecting with the side skeleton.

[0017] Preferably, the spacing of the diagonal tension bars ≥ 1 m.

[0018] Preferably, each diagonal tension bar adopts double-row diagonal tension bars, the diameter of the diagonal tension bars ≥ 20 mm, and both ends of the diagonal tension bars are provided with 45° hooks and are connected to the side surface and the bottom surface through the hooks.

[0019] Preferably, the wire mesh is a high-strength steel wire dense mesh, and the mesh opening diameter is 3 mm.

[0020] Preferably, in the wire mesh located at the bottom surface, holes are left corresponding to the concave and convex positions of the bottom surface.

[0021] Preferably, the overall inclination angle of the diagonal tension bars is between 30° and 60°.

[0022] The present utility model has substantial features and progress compared with the prior art. Specifically, the present utility model has the following advantages:

[0023] 1. Improved safety: The permeable formwork system in this solution uses a formwork with water passing through on three sides and a bottom. The framework is made of HRB hot-rolled ribbed steel bars, and is equipped with diagonal braces and wire meshes, forming a stable triangular structure that can effectively resist water flow impact and pressure, improving the safety of construction.

[0024] 2. Cost reduction: Compared with traditional steel-wood combined formworks and ton-bag formworks, the permeable formwork system in this solution uses industrially produced materials and standard parts. The materials are easily available and inexpensive, which can effectively reduce construction costs.

[0025] 3. Improved construction efficiency: The permeable formwork system in this solution can be fabricated on land and then assembled underwater, avoiding the complexity and risks of underwater construction and improving construction efficiency. At the same time, the permeable formwork system of the present invention is reasonably designed and easy to install, which can greatly reduce construction man-hours.

[0026] 4. Good forming quality: The permeable formwork system in this solution is enclosed with a high-strength steel wire dense mesh, which can effectively prevent the leakage and loss of concrete, ensuring the forming quality of concrete. At the same time, in order to prevent the phenomenon of the permeable formwork being separated from the bottom base surface, holes are preset in the wire mesh at the concave and convex positions at the bottom, so that the concrete can enter the bottom through the holes, ensuring good contact between the concrete pouring and the bottom base surface.

[0027] 5. Strong adaptability: The permeable formwork system in this solution can not only be used for the repair of the tail bay of a hydropower station, but also for other types of underwater concrete pouring, with strong adaptability. Brief Description of the Drawings

[0028] Figure 1 is the overall structural schematic diagram of the permeable formwork system applicable to underwater mass concrete pouring in the present utility model.

[0029] Figure 2 is the structural schematic diagram of the tension bar support assembly in the present utility model.

[0030] Figure 3 is the structural schematic diagram of the bottom framework in the present utility model.

[0031] Figure 4 is the structural schematic diagram of the side framework in the present utility model.

[0032] Figure 5 is the overall structural schematic diagram of the permeable formwork system with partitions applicable to underwater mass concrete pouring in the present utility model.

[0033] Figure 6 is the overall structural schematic diagram of the hoisting construction of the permeable formwork system applicable to underwater mass concrete pouring in the present utility model.

[0034] In the figure: 1. Permeable formwork skeleton; 2. Steel wire mesh; 3. Tie bar support assembly; 11. Side skeleton; 12. Bottom skeleton. Detailed implementation manners

[0035] The technical solution of the present utility model will be further described in detail below through specific implementation manners.

[0036] As Figures 1-6 shown, a permeable formwork system applicable to underwater mass concrete pouring includes a permeable formwork skeleton 1, a steel wire mesh 2 and a tie bar support assembly 3.

[0037] The permeable formwork skeleton 1 includes a three-sided bottom-passing steel bar skeleton formwork composed of three side skeletons 11 and a bottom skeleton 12;

[0038] The steel wire mesh 2 is laid on and fixed to the three side skeletons 11 and the bottom skeleton 12;

[0039] The tie bar support assembly 3 includes a number of diagonal tie bars for connecting the bottom surface and each side surface, forming a locally stable triangular rigid connection structure.

[0040] Specifically, in this embodiment, among the external dimensions of the permeable formwork skeleton, the width ≥ 15 m, the length ≥ 20 m, the height is between 2 m and 3.8 m. The side skeleton is welded into a mesh by HRB hot-rolled ribbed steel bars. Among them, the diameter of the vertical steel bars ≥ 25 mm, the horizontal steel bars ≥ 20 mm, and the spacing between the vertical and horizontal steel bars ≥ 20 cm. The bottom skeleton is welded into a mesh by HRB hot-rolled ribbed steel bars. Among them, the diameter of the horizontal steel bars ≥ 12 mm, the diameter of the longitudinal steel bars ≥ 20 mm, and the spacing between the vertical and horizontal steel bars ≥ 20 cm. The horizontal steel bars at both ends of the bottom skeleton are provided with 90° hooks for connecting with the side skeleton.

[0041] Double rows of at least φ20 mm diagonal tie bars are arranged at least 1 m apart along the three sides of the skeleton, so that the side skeleton and the bottom skeleton are rigidly welded in a triangle to ensure the strength, stiffness and stability of the formwork. Both ends of the tie bars are provided with 45° hooks, and the hooks are welded and connected to the steel bars of the side skeleton and the bottom skeleton. The overall inclination angle of the diagonal tie bars is between 30° and 60°.

[0042] The formwork surface is closed with a high-strength steel wire dense mesh. The aperture of the high-strength steel wire dense mesh is 3 mm, and the strength reaches the requirements of a 3-mm-thick steel plate. In order to ensure good contact between the permeable formwork and the bottom base surface and prevent the phenomenon of voids, holes are preset in the steel wire mesh at the concave and convex positions at the bottom. During the concrete pouring process, the concrete can enter the bottom through the holes, ensuring good contact between the concrete pouring and the bottom base surface.

[0043] Taking materials of specific sizes as an example, the production process and the installation and pouring process are explained:

[0044] Step 1: Prepare materials. First, select HRB hot-rolled ribbed steel bars as the material for the permeable formwork skeleton, with a diameter of 20mm and a length of 5m. Then, select high-strength steel wire mesh as the material for the formwork surface, with a diameter of 3mm and a strength that meets the requirements of a 3mm thick steel plate. In addition, it is necessary to prepare inclined tie bars and tie bar support systems. The selection and use of these materials should be based on actual engineering needs and design requirements.

[0045] Step 2: Make a permeable formwork. Bend the selected HRB hot-rolled ribbed steel bars into a three-sided bottom shape, set double rows of inclined tie bars at intervals of 1m along the three sides of the frame, and weld the side formwork and the bottom formwork frame in a triangular rigid shape. In this process, attention should be paid to the quality and firmness of the welding to ensure the strength, rigidity and stability of the formwork.

[0046] Step 3: Close the template surface. Use a high-strength steel wire mesh to close the template surface, ensuring the uniformity and density of the mesh to prevent leakage and loss of concrete. Preset holes in the steel wire mesh at the concave and convex positions at the bottom, with a diameter of 5mm, so that during the concrete pouring process, the concrete can enter the bottom through the holes to ensure good contact between the concrete pouring and the bottom base surface.

[0047] Step 4: Install the permeable formwork. Install the permeable formwork underwater, paying special attention to the installation of the joint between the permeable formwork and the tail sill, and use a wedge structure of 0.5*1m reserved at the bottom of the upstream surface of the side formwork to ensure that the permeable formwork fits tightly with the tail sill.

[0048] Step 5: Pour concrete. Pour concrete in the permeable formwork. During the pouring process, the concrete will enter the bottom through the preset holes to ensure good contact between the concrete pouring and the bottom base surface, thereby ensuring the molding quality of the concrete.

[0049] This solution can effectively solve the technical problems of the difficulty in making and installing underwater concrete pouring formwork and the high risk of underwater installation operations, improve the adaptability of the formwork system, reduce the complexity and difficulty of construction, and at the same time ensure the molding quality of concrete and the overall quality of the project.

[0050] Due to the advanced nature of this technical solution, it can be widely used in application fields such as underwater engineering construction, concrete pouring and formwork system design.

[0051] First of all, the permeable formwork system of this solution can effectively solve the technical problems of high difficulty in the fabrication and installation of underwater concrete casting formwork and high risk of underwater installation operations, improve the adaptability of the formwork system, reduce the complexity and difficulty of construction, and at the same time ensure the forming quality of concrete and the overall quality of the project, which is of great significance to the field of underwater engineering construction. Secondly, the permeable formwork system of this solution can effectively improve the efficiency and quality of concrete casting, which has important application value in the field of concrete casting technology. Finally, the permeable formwork system of this solution is reasonably designed and easy to install, which can greatly reduce the construction man-hours and has important reference value in the field of formwork system design. At the same time, since the permeable formwork system of this solution can be used not only for the repair of the tail bay of hydropower stations but also for other types of underwater concrete casting and has strong adaptability, it has broad application prospects in the market.

[0052] This solution was experimentally verified during the underwater concrete casting construction of the project for eliminating the diseases of the dam of the Dadingshan Navigation-Power Junction, and good results were obtained.

[0053] Finally, it should be noted that: The above has made a detailed description of the preferred embodiment of this patent, but this patent is not limited to the above embodiment. Within the scope of knowledge possessed by ordinary technicians in the art, various changes can also be made without departing from the purpose of this patent.

Claims

1. A permeable formwork system suitable for underwater mass concrete pouring, characterized by: It includes a permeable formwork frame, a steel wire mesh and a reinforcement support assembly; The permeable formwork frame includes a three-sided bottom-water-permeable steel reinforcement frame formwork consisting of three side surfaces and a bottom surface; The steel wire mesh is laid on the three side surfaces and one bottom surface and fixed thereto; The tie rod support assembly includes a plurality of oblique tie rods for connecting the bottom surface and each side surface to form a locally stable triangular rigid connection structure.

2. The permeable formwork system suitable for underwater mass concrete pouring according to claim 1 is characterized in that: The outer dimensions of the permeable template skeleton are as follows: the width is ≥15m, the length is ≥20m, and the height is between 2m and 3.8m.

3. The permeable formwork system suitable for underwater mass concrete pouring according to claim 2 is characterized in that: The side frames of the permeable formwork frame are welded into a mesh by HRB hot-rolled ribbed steel bars, wherein the diameter of the vertical steel bars is ≥25mm, the diameter of the transverse steel bars is ≥20mm, and the spacing between the vertical and transverse steel bars is ≥20cm.

4. The permeable formwork system suitable for underwater mass concrete pouring according to claim 3 is characterized in that: The bottom frame of the permeable formwork frame is welded into a mesh by HRB hot-rolled ribbed steel bars, wherein the diameter of the transverse steel bars is ≥12 mm, the diameter of the longitudinal steel bars is ≥20 mm, and the spacing between the vertical and transverse steel bars is ≥20 cm.

5. The permeable formwork system suitable for underwater mass concrete pouring according to claim 4 is characterized in that: Both ends of the transverse steel bars in the bottom frame of the permeable formwork frame are provided with 90° hooks for connecting with the side frames.

6. The permeable formwork system suitable for underwater mass concrete pouring according to claim 5 is characterized in that: The spacing between the oblique reinforcement bars is ≥1m.

7. The permeable formwork system suitable for underwater mass concrete pouring according to claim 6 is characterized in that: Each oblique tie bar adopts double rows of oblique tie bars, the diameter of the oblique tie bars is ≥20mm, and both ends of the oblique tie bars are provided with 45° hooks, which are connected to the side and bottom surfaces through the hooks.

8. The permeable formwork system suitable for underwater mass concrete pouring according to claim 7 is characterized in that: The steel wire mesh is a high-strength steel wire dense mesh with a mesh opening diameter of 3 mm.

9. The permeable formwork system suitable for underwater mass concrete pouring according to claim 8 is characterized in that: Holes are left in the wire mesh located on the bottom surface at locations corresponding to the concave and convex positions of the bottom surface.

10. The permeable formwork system suitable for underwater mass concrete pouring according to claim 9, characterized in that: The overall inclination angle of the oblique tie bars is between 30° and 60°.

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