Special-shaped air shaft diffusion tower concrete formwork auxiliary mounting and positioning device

Abstract

The utility model relates to the field of coal mine air shaft diffusion tower construction, in particular to an auxiliary installing and positioning device for a special-shaped air shaft diffusion tower concrete formwork. Comprising an inner mold auxiliary positioner and an outer mold auxiliary positioner. The inner mold auxiliary positioner comprises an inner mold vertical rod, a plurality of inner mold supporting rods with the length gradually increased are welded to the side face of the inner mold vertical rod from bottom to top, arc-shaped flat steel is welded to the ends, away from the inner mold vertical rod, of the inner mold supporting rods, and the diameter of the arc-shaped flat steel is gradually reduced. The outer mold auxiliary positioner comprises an outer mold vertical rod, a plurality of outer mold supporting rods with the length gradually reduced are welded to the side face of the outer mold vertical rod from bottom to top, and flat steel is welded to the ends, away from the outer mold vertical rod, of the outer mold supporting rods. By using the auxiliary mounting and positioning device for the diffusion tower concrete formwork, the construction cost is reduced, and the construction efficiency is improved; by means of the method that the auxiliary positioner is combined with design and manufacturing of the same formwork module units, accurate control and efficient construction of the special-shaped diffusion tower are achieved, accurate and rapid installation of formworks is achieved, the construction speed is increased, benefits are improved, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of coal mine air shaft diffusion tower construction, in particular to an auxiliary installation and positioning device for a special-shaped air shaft diffusion tower concrete template. Background Art

[0002] There are two mainstream types of diffusion towers in coal mine air shafts. One is a circular with hyperbolic surfaces inside and outside, and the other is a square outside and a circular inside. The former has a simple template installation, while the latter is more difficult to install, but has better stability than the former.

[0003] Traditionally, the installation of formwork for special-shaped diffusion towers requires hanging a line from the center point, calculating the circular cross-section based on the degree of diffusion, then laying out and pre-assembling the formwork on-site before finally installing and securing it. This approach can lead to increased cumulative human error, preventing precise control and efficient construction, resulting in low efficiency and increased costs.

[0004] For example, the Yanjiazhuang air shaft ventilation room has two diffusion towers (1# and 2#), with a building height of 28.3m. They are C30 reinforced concrete structures with a square exterior and a circular interior. The interior is an inverted cone, with a gradient of 6.97 degrees from a 5m diameter circle to a 9m diameter circle, with a gradient height of 16.364m. The exterior is an inverted trapezoid, with a lower opening length of 6.2m gradually decreasing to a side length of 9.7m, and a wall thickness gradually decreasing from 0.6m to 0.35m. Figure 1 and 2 As shown in the figure, during the construction of the outer square inner circle diffusion tower, the interior formed an inverted cone, gradually changing from a 5m diameter circle to a 9m diameter circle at a 6.97° angle, with a gradient height of 16.364m. The exterior formed an inverted trapezoid, with a lower opening length of 6.2m gradually decreasing to a side length of 9.7m. Formwork installation was difficult and challenging to precisely control, so determining the appropriate concrete formwork installation method to improve construction efficiency and reduce costs was an urgent issue.

[0005] China Railway No. 5 Engineering Group Construction Engineering Co., Ltd. reported an auxiliary positioning device for the installation of special-shaped concrete structures, involving pillars, rotating bearings, outer shells, inner rings, etc. Qingdao Qingfang Construction Group Co., Ltd. reported a concrete air shaft lining installation structure, involving positioning nuts, etc. China Seventeenth Metallurgical Group Co., Ltd. reported an auxiliary positioning device for formwork installation and its use method. Hubei Bahe Yunfeng Construction Engineering Co., Ltd. reported a new type of concrete formwork installation device for construction. Rugao Xinhui Transportation Facilities Construction Investment Co., Ltd. reported a steel formwork positioning construction structure for reinforced concrete components. However, the above structures all have problems such as complex structure and high production cost. Summary of the Invention

[0006] The utility model provides an auxiliary installation and positioning device for the concrete formwork of a special-shaped air shaft diffusion tower to solve the technical problems of difficulty in template installation, difficulty in precise control and low construction efficiency during the construction of an outer square inner circle diffusion tower.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: an auxiliary installation and positioning device for the concrete formwork of a special-shaped air shaft diffusion tower, including an inner form auxiliary positioner and an outer form auxiliary positioner;

[0008] The inner mold auxiliary positioner includes an inner mold upright, and a plurality of inner mold support rods with increasing lengths are welded on the side of the inner mold upright from bottom to top. An end of the inner mold support rod away from the inner mold upright is welded with an arc-shaped flat steel, and the diameter of the arc-shaped flat steel gradually decreases;

[0009] The outer mold auxiliary positioner includes an outer mold upright, and a plurality of outer mold support rods with gradually decreasing lengths are welded from bottom to top on the side of the outer mold upright. A flat steel is welded on one end of the outer mold support rod away from the outer mold upright.

[0010] Furthermore, six equally spaced inner mold support rods are welded to the side of the inner mold upright, and the lengths of the inner mold support rods from bottom to top are: 0.293m, 0.587m, 0.88m, 1.173m, 1.467m, and 1.760m respectively.

[0011] Furthermore, five equally spaced outer mold support rods are welded to the side of the outer mold upright, and the lengths of the inner mold support rods from bottom to top are: 1.493m, 1.237m, 0.98m, 0.723m, and 0.467m respectively.

[0012] Furthermore, the inner mold uprights and the outer mold uprights are made of steel pipes, and the inner mold support rods and the outer mold support rods are made of steel bars.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] By using auxiliary installation and positioning devices for diffusion tower concrete formwork, construction costs can be reduced and construction efficiency can be improved.

[0015] Pre-design, calculation, and production of auxiliary locators and cutting and production of template module units enable precise design and installation of special-shaped templates. This operation method is currently used for the first time in construction in the same industry.

[0016] By combining auxiliary positioners with the design and manufacture of identical template modules, we achieved precise control and efficient construction of special-shaped diffusion towers. This allowed for precise and rapid installation of templates, accelerated construction, improved efficiency, and reduced costs. This experience was summarized for similar projects and provides a reference for future projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a longitudinal cross-section of the special-shaped diffusion tower.

[0018] Figure 2This is a three-dimensional diagram of the special-shaped diffusion tower.

[0019] Figure 3 This is a structural diagram of the inner mold auxiliary positioner.

[0020] Figure 4 This is a schematic diagram of one end of the inner mold auxiliary locator.

[0021] Figure 5 This is a schematic diagram of the inner mold auxiliary positioner in use.

[0022] Figure 6 This is a structural diagram of the outer mold auxiliary positioner.

[0023] Figure 7 This is a schematic diagram of one end of the outer mold auxiliary locator.

[0024] Figure 8 This is a schematic diagram of the use of the outer mold auxiliary positioner.

[0025] Figure 9 This is the inner mold layout diagram.

[0026] Figure 10 This is the outer mold layout drawing.

[0027] The following are marked in the figure:

[0028] 1-Inner mold upright, 2-Inner mold support rod, 3-Curved flat steel, 4-Outer mold upright, 5-Outer mold support rod, 6-Flat steel, 7-Universal wedge-shaped template. DETAILED DESCRIPTION

[0029] The present invention will be further described below with reference to specific embodiments. Example 1

[0030] An auxiliary installation and positioning device for a special-shaped air shaft diffusion tower concrete formwork, comprising an inner form auxiliary positioner and an outer form auxiliary positioner;

[0031] like Figure 3-5 As shown, the inner mold auxiliary positioner includes an inner mold upright rod 1, and a plurality of inner mold support rods 2 with increasing lengths are welded to the side of the inner mold upright rod 1 from bottom to top. An arc-shaped flat steel 3 is welded to the end of the inner mold support rod 2 away from the inner mold upright rod 1, and the diameter of the arc-shaped flat steel 3 gradually decreases;

[0032] like Figure 6-7 As shown, the outer mold auxiliary positioner includes an outer mold upright 4, and a plurality of outer mold support rods 5 with gradually decreasing lengths are welded to the side of the outer mold upright 4 from bottom to top, and a flat steel 6 is welded to the end of the outer mold support rod 5 away from the outer mold upright 4.

[0033] Furthermore, six inner mold support rods 2 distributed at equal intervals are welded to the side of the inner mold upright 1, and the lengths of the inner mold support rods 2 from bottom to top are: 0.293m, 0.587m, 0.88m, 1.173m, 1.467m, and 1.760m respectively.

[0034] Furthermore, five outer mold support rods 5 with equal spacing are welded to the side of the outer mold upright 4, and the lengths of the inner mold support rods 2 from bottom to top are: 1.493m, 1.237m, 0.98m, 0.723m, and 0.467m respectively.

[0035] Furthermore, the inner mold uprights 1 and the outer mold uprights 4 are made of steel pipes, and the inner mold support rods 2 and the outer mold support rods 5 are made of steel bars.

[0036] Because the outer walls of the diffusion tower are inverted trapezoidal on all four sides and the inner wall is an inverted frustum, while commercially available formwork is fixed rectangular in size, each formwork needs to be pre-cut into modular units for quick assembly. Parameters for the auxiliary positioning device were studied: The height and number of pours were determined based on the formwork's shape and dimensions. The auxiliary positioner parameters were spatially and angularly determined based on the pour height and the diffusion tower's diffusion coefficient. Through calculation and analysis, the universal dimensions for the inner and outer formwork were identified. Universal formwork was mass-produced and assembled using the universal formwork for each pour, with wedge-shaped corners used to fill any gaps.

[0037] 1. Set four inner mold auxiliary locators at the four tangent points of the four tangent lines of the inner mold circle. Extend the tangent points to the intersection with the outer mold, and also set four outer mold auxiliary locators. The auxiliary locators use steel pipes as the main vertical poles. The diffusion diameter is calculated according to the construction height of the flap once. The length of the support rods welded to the main vertical poles matches the diffusion diameter. Arc-shaped flat steel or flat steel is welded at the ends to form inner and outer mold auxiliary devices respectively. The curvature of the flat steel matches the inner mold diameter. The height and number of each pouring are determined according to the shape and size of the template. The auxiliary locator parameters are determined in space and angle based on the pouring height and the diffusion degree of the diffusion tower.

[0038] 2. Design and manufacture inverted trapezoidal formwork of the same size and height, supplementing it with wedge-shaped small-angle formwork for each pour. For example, if pouring the first layer requires 10 inverted trapezoidal formwork, and pouring the second layer requires 12 inverted trapezoidal formwork, and the structure still cannot be closed, additional wedge-shaped small-angle formwork will be needed. The third layer will require 15 inverted trapezoidal formwork plus wedge-shaped formwork, and so on.

[0039] The use process of the utility model of the auxiliary installation and positioning device for the special-shaped air shaft diffusion tower concrete formwork is as follows:

[0040] Combined with the actual situation of the diffusion tower project in Yanjiazhuang ventilation room, the specific research and application steps are as follows:

[0041] First, the auxiliary locator is designed and produced. The auxiliary locator consists of the main vertical pole, support pole and flat steel, which are divided into inner mold auxiliary locator and outer mold auxiliary locator. Four are set at the four tangent points of the four tangent lines of the inner mold circle, and four are also set at the intersection with the outer mold. The main vertical pole is made of steel pipe, and the diffusion diameter (i.e. the length of the support pole) is calculated according to the 2.4m height of the flap construction. The support pole is welded to the main vertical pole with steel bars, and flat steel is welded to the front end of the support pole. The curvature of the inner mold flat steel is consistent with the circle diameter. The bottom of the main vertical pole is pre-buried and fixed with a concrete pier, and the upper part is fixed to the operating frame. When the inner and outer formwork are installed on the outside of the flat steel and fit tightly, it means that the diffusion degree is correct. Determine the length of the inner mold support pole: the first step is to lift 2.4m and diffuse according to 6.97 degrees. The calculated support pole length is 0.293m. The second step is to raise the pole by another 2.4m, and the pole length is 0.587m. The third step is to raise the pole by 0.88m, the fourth step is to raise the pole by 1.173m, the fifth step is to raise the pole by 1.467m, the sixth step is to raise the pole by 1.760m, and the seventh step is to raise the pole by 2m. The front part of the pole is welded with curved flat steel, and the curvature is consistent with the diffusion diameter.

[0042] Determine the length of the outer mold support rods: First, raise the rod by 2.4m and, using a 6.97-degree spread, calculate the rod length to be 1.493m. Second, raise the rod by another 2.4m, resulting in a rod length of 1.237m. Similarly, in the third step, the rod length is 0.98m. In the fourth step, the rod length is 0.723m. In the fifth step, the rod length is 0.467m. In the sixth step, the rod length is 0.21m.

[0043] Next, we determined the common parameters for the internal and external formwork, and mass-produced the same specifications. The internal formwork was a trapezoidal shape with a top length of 1097mm, a bottom length of 982mm, and a height of 2400mm, with the remaining wedge-shaped corners filled in. The external formwork was a 1200*2400mm full-length plate with the remaining wedge-shaped corners filled in.

[0044] Inner mold step-by-step casting template dimensions (Table 1)

[0045]

[0046] External formwork casting in steps (Table 2)

[0047]

[0048] Finally, an on-site industrial test was conducted, using the third pouring step as the test section. The construction surface height was +12.3m, the inner formwork area was 55.2㎡, the outer formwork area was 57.6㎡, and the concrete pouring volume was 25.7m³. The internal and outer formwork were installed by four people in one day. When the concrete strength reached 75%, the formwork was removed and the concrete surface was measured for flatness, which met the requirements.

[0049] Determine the length of the outer mold support rods: First, raise the rod by 2.4m and, using a 6.97-degree spread, calculate the rod length to be 1.493m. Second, raise the rod by another 2.4m, resulting in a rod length of 1.237m. Similarly, in the third step, the rod length is 0.98m. In the fourth step, the rod length is 0.723m. In the fifth step, the rod length is 0.467m. In the sixth step, the rod length is 0.21m.

[0050] Economic and social benefits

[0051] According to past experience, when installing special-shaped formwork at height, each person can install a maximum of 15 square meters of formwork per day. By assembling with auxiliary locators and batch-produced general-sized formwork, each person can install 25-30 square meters of formwork per day, speeding up the formwork installation progress by 30%.

[0052] Labor cost. According to traditional experience, taking 1000㎡ as an example, 1000㎡÷15㎡ / day=66.6 man-days. According to this research method, 1000㎡÷25㎡ / day=40 man-days. Calculated at 400 yuan per day for carpentry, the template installation can save 400*66.6 / 1000-400*40 / 1000=10.64 yuan / ㎡ per square meter.

[0053] Promotion and application prospects

[0054] Coal mine air shaft diffusion towers are mostly special-shaped structures in the future. Through the research on the auxiliary installation and positioning device of the concrete formwork of special-shaped air shaft diffusion towers, it can provide reference for future special-shaped structure projects of coal mine projects or similar projects, improve construction efficiency, reduce construction costs, and create considerable economic benefits for our company.

Claims

1. An auxiliary installation and positioning device for a special-shaped air shaft diffusion tower concrete formwork, characterized in that: Including inner mold auxiliary positioner and outer mold auxiliary positioner; The inner mold auxiliary positioner comprises an inner mold upright (1), a plurality of inner mold support rods (2) with gradually increasing lengths are welded to the side surface of the inner mold upright (1) from bottom to top, an arc-shaped flat steel (3) is welded to one end of the inner mold support rod (2) away from the inner mold upright (1), and the diameter of the arc-shaped flat steel (3) gradually decreases; The outer mold auxiliary positioner comprises an outer mold upright (4), a plurality of outer mold support rods (5) of gradually decreasing lengths are welded from bottom to top on the side surface of the outer mold upright (4), and a flat steel (6) is welded on one end of the outer mold support rod (5) away from the outer mold upright (4).

2. The auxiliary installation and positioning device for the special-shaped air shaft diffusion tower concrete formwork according to claim 1 is characterized in that: Six inner mold support rods (2) distributed at equal intervals are welded to the side of the inner mold upright (1), and the lengths of the inner mold support rods (2) from bottom to top are respectively: 0.293m, 0.587m, 0.88m, 1.173m, 1.467m, and 1.760m.

3. The auxiliary installation and positioning device for the special-shaped air shaft diffusion tower concrete formwork according to claim 1 is characterized in that: Five outer mold support rods (5) distributed at equal intervals are welded to the side of the outer mold upright (4), and the lengths of the inner mold support rods (2) from bottom to top are: 1.493m, 1.237m, 0.98m, 0.723m, and 0.467m respectively.

4. The auxiliary installation and positioning device for the special-shaped air shaft diffusion tower concrete formwork according to claim 1 is characterized in that: The inner mold uprights (1) and the outer mold uprights (4) are made of steel pipes, and the inner mold support rods (2) and the outer mold support rods (5) are made of steel bars.

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