Inverted cone water tower tank manhole formwork support structure
By adopting an integrated support structure with a steel cylinder and tie bolts, the problems of large formwork volume, safety hazards and leakage risks in the construction of manholes for inverted conical water towers and water tanks were solved, achieving efficient construction and structural stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA MCC22 GROUP CORP LTD
- Filing Date
- 2025-08-26
- Publication Date
- 2026-07-21
AI Technical Summary
Existing technologies for constructing manholes in inverted conical water towers and water tanks involve large amounts of work in the erection and dismantling of formwork and support systems, high labor costs, long construction periods, limited operating space, and potential safety hazards. They may also lead to seepage channels, affecting the structure's self-waterproofing performance.
A steel cylinder is used as a permanent inner formwork, and it is connected to the outer formwork and support components by tie bolts to form an integral support structure. This avoids the formation of through-holes in the concrete, reduces the need for internal formwork operations, and increases external operating space.
It simplifies the formwork erection and dismantling process, shortens the construction cycle, improves construction safety and the structure's self-waterproofing performance, and reduces the risk of leakage.
Smart Images
Figure CN224532243U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of building construction technology, specifically a formwork support structure for an inverted conical water tower / water tank manhole. Background Technology
[0002] In water conservancy projects, fire protection facilities, and industrial water storage, inverted conical water towers are a common structure. Their top water tank typically includes a manhole for maintenance and personnel access. As a crucial component of the water tower structure, the quality of the manhole's construction directly affects the overall structure's sealing, durability, and functionality.
[0003] Currently, the traditional method commonly used in the construction of this type of manhole structure is a cast-in-place concrete system based on double-sided formwork. During construction, formwork needs to be erected simultaneously inside and outside the manhole structure. The formwork is mostly made of steel or wood, and the inner and outer formwork are fixed by tie rods that penetrate the concrete walls. This conventional approach presents several problems that urgently need to be addressed: First, the erection and dismantling of the formwork and support system involves a large amount of work, resulting in high costs for formwork turnover materials, high labor consumption, and a long overall construction period. Second, the tie rods need to penetrate the structural walls, creating continuous channels in the concrete. Even if these channels are subsequently sealed, they may become seepage channels due to material shrinkage or construction defects, adversely affecting the structure's self-waterproofing. Third, the operating space inside the manhole is usually extremely confined. When performing formwork erection, reinforcement, and dismantling operations inside, the construction conditions are poor, workers are inconvenient to operate, there are safety hazards, and it is difficult to guarantee the installation accuracy of the formwork system and the quality of the concrete pouring. Utility Model Content
[0004] The present invention aims to solve the above problems and thus provide a formwork support structure for the manhole of an inverted conical water tower / water tank that ensures the quality of casting.
[0005] The technical solution adopted by this utility model to solve the aforementioned problem is: A formwork support structure for the manhole of an inverted conical water tower tank, comprising: The steel cylinder serves as the permanent inner formwork and lining structure for the manhole. Ladders are installed on the inner wall of the steel cylinder, and multiple tie bolts are fixed radially on the outer wall of the steel cylinder. The outer template is set on the outside of the steel cylinder, and the outer template has holes for the free ends of the tie bolts to pass through; The external support components include vertical wooden joists spaced apart on the outside of the outer template, with steel clamps fitted on the outside of the vertical wooden joists, and fastening nuts fitted on the free ends of the tie bolts that abut against the outer template. The steel cylinder, outer formwork, and external support components are connected by tie bolts to form an integral support structure, and a cavity for pouring concrete is formed between the precast steel cylinder and the outer formwork.
[0006] Compared with the prior art, the outstanding features of this utility model, which adopts the above technical solution, are: By using a steel cylinder with built-in ladders and radially welded tie bolts as a permanent internal formwork, and connecting it with the external formwork and support components through tie bolts to form an integral structure, this structure reduces the need for formwork operations inside the manhole, helping to alleviate the inconvenience of construction operations caused by the narrow internal space; at the same time, it avoids the formation of through-holes in the concrete, which may reduce the risk of leakage; in addition, this structural formwork reduces the amount of work involved in formwork erection and dismantling, which may have a positive impact on shortening the construction period.
[0007] As a preferred embodiment, a further technical solution of this utility model is: Furthermore, the ladder is a steel ladder. The use of steel may help improve the structural strength and long-term durability of the ladder, and a reliable connection can be achieved between it and the steel cylinder through welding.
[0008] Furthermore, the ends of the tie bolts are fixedly connected to the outer wall of the steel cylinder by full welding. This connection method may provide greater connection strength and reliability, so as to effectively withstand lateral pressure during concrete pouring and maintain the overall stability of the formwork system.
[0009] Furthermore, the external support components also include an operating scaffolding platform erected on the outside of the outer formwork. This platform can provide a stable external operating space for subsequent processes such as formwork installation and concrete pouring, which may improve the working conditions of workers.
[0010] Furthermore, a steel reinforcement cage is set between the steel cylinder and the outer formwork. The steel reinforcement cage provides reinforcement to the concrete poured between them, which may have a positive effect on the integrity and mechanical properties of the concrete structure after molding. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model; Figure 2 This is a top view of the main body of the embodiment of the present utility model; The markings in the diagram are: 1. Water tank lifting and positioning ring plate; 2. Operating scaffold platform; 3. Steel cylinder; 4. Steel ladder; 5. Tie bolts; 6. Outer formwork; 7. Vertical wooden joists; 8. Steel clamps. Detailed Implementation
[0012] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.
[0013] A formwork support structure for the manhole of an inverted conical water tower tank, comprising: The steel cylinder 3 serves as the permanent inner template and lining structure of the manhole. A ladder is provided on the inner wall of the steel cylinder 3, and multiple tie bolts 5 are fixed radially on the outer wall of the steel cylinder 3. The outer template 6 is set on the outside of the steel cylinder 3, and the outer template 6 is provided with holes for the free ends of the tie bolts 5 to pass through. The external support components include vertical wooden joists 7 spaced apart on the outside of the outer template 6, steel clamps 8 sleeved on the outside of the vertical wooden joists 7, and fastening nuts that abut against the outer template 6 fitted on the free ends of the tie bolts 5. The steel cylinder 3, the outer formwork 6, and the external support components are connected by tie bolts 5 to form an integral support structure, and a cavity for pouring concrete is formed between the precast steel cylinder 3 and the outer formwork 6.
[0014] Furthermore, the ladder is a steel ladder 4. The use of steel may help improve the structural strength and long-term durability of the ladder, and a reliable connection can be achieved between it and the steel cylinder 3 through welding.
[0015] Furthermore, the ends of the tie bolts 5 are fixedly connected to the outer wall of the steel cylinder 3 by full welding. This connection method may provide greater connection strength and reliability, so as to effectively withstand lateral pressure during concrete pouring and maintain the overall stability of the formwork system.
[0016] Furthermore, the external support components also include an operating scaffolding platform 2 erected on the outside of the outer formwork 6. This platform can provide a stable external operating space for subsequent processes such as formwork installation and concrete pouring, which may improve the working conditions of workers. The overall construction is located on the water tank lifting and positioning ring plate 1.
[0017] Furthermore, a steel reinforcement cage is provided between the steel cylinder 3 and the outer formwork 6. The steel reinforcement cage provides reinforcement to the concrete poured between them, which may have a positive effect on the integrity and mechanical properties of the concrete structure after molding.
[0018] By using a steel cylinder 3 with a built-in ladder and radially welded tie bolts 5 as a permanent inner formwork, and connecting it with the outer formwork and support components through tie bolts 5 to form an integral structure, this structure reduces the need for formwork operations inside the manhole, which helps to improve the inconvenience of construction operations caused by the narrow internal space; at the same time, it avoids the formation of through-holes in the concrete, which may reduce the risk of leakage caused by this; in addition, this structural formwork reduces the amount of work involved in the erection and dismantling of formwork, which may have a positive impact on shortening the construction period.
[0019] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.
Claims
1. A formwork support structure for a manhole in an inverted conical water tower tank, characterized in that: include: The steel cylinder serves as the permanent inner formwork and lining structure for the manhole. Ladders are installed on the inner wall of the steel cylinder, and multiple tie bolts are fixed radially on the outer wall of the steel cylinder. The outer template is set on the outside of the steel cylinder, and the outer template has holes for the free ends of the tie bolts to pass through; The external support components include vertical wooden joists spaced apart on the outside of the outer template, with steel clamps fitted on the outside of the vertical wooden joists, and fastening nuts fitted on the free ends of the tie bolts that abut against the outer template. The steel cylinder, outer formwork, and external support components are connected by tie bolts to form an integral support structure, and a cavity for pouring concrete is formed between the precast steel cylinder and the outer formwork.
2. The manhole support structure for the inverted conical water tower / water tank according to claim 1, characterized in that: The ladder is a steel ladder.
3. The manhole support structure for the inverted conical water tower / water tank according to claim 1, characterized in that: The ends of the tie bolts are fixedly connected to the outer wall of the steel cylinder by full welding.
4. The manhole support structure for the inverted conical water tower / water tank according to claim 1, characterized in that: The external support components also include the operating scaffolding platform erected on the outside of the outer formwork.
5. The manhole support structure for the inverted conical water tower / water tank according to claim 1, characterized in that: A steel reinforcement cage is installed between the steel cylinder and the outer formwork.