Quick assembling method for outer mold of variable cross-section tower column of concrete bridge tower

Abstract

A concrete bridge tower variable cross-section tower column outer mold rapid assembling method comprises the steps that a tower column is divided into n segments in the height direction for segmented construction, and the outer contour of the cross section of each tower column segment i is constructed to be of a single-axis symmetric hexagonal structure; six outer formworks are configured for each tower column section; setting construction parameters of each outer template, wherein the total width W of each outer template meets the formula W = We + Wr; establishing a template cutting judgment rule: defining a cutting coefficient q, when q is equal to 1, cutting is needed, and when q is equal to 0, cutting is not needed; and optimizing a template assembling scheme: Q = sigma q. According to the method, the templates are reasonably processed and spliced in a proper sequence, and a simple mathematical model is constructed, so that the templates needing to be cut are minimized; the workload and time of high-altitude operation are reduced, the risk of high-altitude operation is reduced while the labor cost and the formwork cost are reduced, the construction safety is enhanced, and the formwork can be repeatedly used; meanwhile, the main tower outer formwork splicing time is shortened, the main tower construction progress is accelerated, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rapid construction of main tower formwork, and in particular to a rapid assembly method for an outer formwork of a variable-section tower column of a concrete bridge tower. Technical Background

[0002] The existing method of assembling the formwork of the column of a variable-section concrete bridge tower usually adopts the method of cutting and assembling the formwork according to the tower column design drawings at different construction sections as the height of the bridge tower column increases. However, this traditional method has significant defects in actual construction: first, from the perspective of safety, this method requires a lot of high-altitude operations, workers stay in the air for a long time, and the construction safety risk is high; second, from the perspective of economy, this method consumes a lot of manpower, and the template is cut frequently, resulting in serious waste of materials, and the cut template is difficult to reuse, which increases the construction cost; finally, from the perspective of construction efficiency, the template assembly of this method takes a long time, which seriously restricts the progress of construction. Therefore, there is an urgent need for an improved formwork assembly method that can take into account safety, economy and construction efficiency. Summary of the invention

[0003] The purpose of the present invention is to address the problems existing in the prior art and to propose a method for quickly and conveniently constructing a variable-section main tower formwork for a bridge, which helps to reduce the risk of high-altitude operations, lower the cost of formwork engineering, and achieve the goal of quickly completing the assembly of the main tower formwork.

[0004] The present invention is achieved through the following technical solutions.

[0005] The method for rapidly assembling the outer formwork of a concrete bridge tower column with a variable cross-section described in the present invention is characterized by comprising the following steps.

[0006] S1. Divide the tower column into n segments along the height direction for segmental construction. The cross-sectional outer contour of each tower column segment i is constructed as a uniaxially symmetrical hexagonal structure. The hexagon is formed by sequentially connecting the B1i side, the B2i side, the B3i side, the B4i side, the B5i side and the B6i side end to end, wherein: The lengths of the sides B1i, B2i, B4i, and B6i decrease along the height of the tower column; The B3i and B5i sides maintain constant length; The sides B2i and B6i, and the sides B3i and B5i are arranged in mirror symmetry about the horizontal axis X, which passes through the geometric centroid of the hexagon; Among them, i=1, 2,…, n, and the value of i is positively correlated with the construction sequence of the tower column segments.

[0007] S2. Configure six external templates for each tower column segment i, including: MB1i template corresponds to the wrapped B1i edge; The MB2i template corresponds to the wrapped B2i edge; The MB3i template covers the B3i edge accordingly; The MB4i template covers the B4i edge accordingly; MB5i templates cover the B5i edges accordingly; The MB6i template covers the B6i edge accordingly.

[0008] S3. Set the construction parameters of each external template.

[0009] The total width W of each outer formwork satisfies: W=We+Wr, where We is the effective width in contact with concrete and Wr is the redundant width exceeding the segment profile.

[0010] For MB3i and MB5i templates, the total width W is constant along the tower height and Wr=0.

[0011] For MB2i and MB6i templates, their total width W is constant and We decreases along the height, or both the total width W and We decrease along the height and Wr=0.

[0012] For MB1i and MB4i templates, their total width W is constant and We decreases along the height, or both the total width W and We decrease along the height and Wr=0.

[0013] S4. Establish template cutting judgment rules.

[0014] Define the cutting coefficient q. When q=1, it means cutting is required, and when q=0, it means no cutting is required.

[0015] In the cutting judgment rule, when q=1, the template is mechanically cut and then spliced ​​with the adjacent template. When q=0, the template does not need to be cut, and a connection structure is set at the end of the template for splicing with the adjacent template.

[0016] When We decreases and Wr=0, q=1; When We decreases and Wr>0, q=0; When We is constant, q=0.

[0017] S5. Optimize template assembly plan.

[0018] The total amount of template cutting outside each segment Q = Σq is calculated to minimize the Q value, where for any segment i, the Wr corresponding to the MB2i and MB6i templates are equal, and the Wr corresponding to the MB1i and MB4i templates are equal.

[0019] When Wr(MB2i)=Wr(MB6i)>Wr(MB1i)=Wr(MB4i), the total width W of MB2i and MB6i is constant and We decreases along the height; the total width W and We of MB1i and MB4i both decrease along the height and Wr=0.

[0020] The optimal solution satisfies q(MB1i)=1, q(MB2i)=0, q(MB3i)=0, q(MB4i)=1, q(MB5i)=0, q(MB6i)=0. At this time, Q=2, and the theoretical value range of Q is [2,6] and is an even number.

[0021] When Wr(MB1i)=Wr(MB4i)>Wr(MB2i)=Wr(MB6i), the total width W of MB1i and MB4i is constant and We decreases along the height; the total width W and We of MB2i and MB6i both decrease along the height and Wr=0.

[0022] The optimal solution satisfies q(MB1i)=0, q(MB2i)=1, q(MB3i)=0, q(MB4i)=0, q(MB5i)=0, q(MB6i)=1, at which time Q=2, and the theoretical value range of Q is [2,6] and is an even number.

[0023] Then we have: Q=Σq= q(MB1i)+ q(MB2i)+ q(MB3i)+q(MB4i)+q(MB5i)+(MB6i) Where i=1, 2, 3,…, n.

[0024] In a preferred embodiment of the present invention: the MB3i and MB5i templates adopt standard templates with equal cross-sections, the MB1i and MB4i templates adopt trapezoidal detachable templates; the MB2i and MB6i templates adopt templates with sliding adjustment mechanisms, which can be translated along the horizontal symmetry axis X direction to adapt to changes in Wr.

[0025] In summary, compared with the traditional complex cross-section main tower formwork assembly, the present invention has the following beneficial effects.

[0026] The present invention processes the templates reasonably, assembles them in an appropriate order, and constructs a simple mathematical model to minimize the templates that need to be cut. This can reduce the workload and operation time of high-altitude operations, thereby reducing the labor cost and template cost while reducing the risk of high-altitude operations, enhancing construction safety, and making the templates reusable without the need to make new templates when constructing new construction sections; on the other hand, this method can shorten the assembly time of the main tower external template, speed up the main tower construction progress, and improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the cross section of the main tower.

[0028] Figure 2 This is the template layout drawing of the first section of the main tower.

[0029] Figure 3 This is the template layout drawing of the i-th section of the main tower.

[0030] Figure 4 It is the elevation drawing of the main tower column segments i and i+1.

[0031] Figure 5 This is the main tower i-1 section template layout and dimension drawing.

[0032] Figure 6 This is the main tower i section template layout and dimension drawing.

[0033] Figure 7 This is the main tower i+1 section template layout and dimension drawing. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and through specific embodiments.

[0035] In this embodiment, the method of the present invention is used to quickly assemble the outer formwork of the variable-section tower column of a concrete bridge tower, which includes the following detailed steps.

[0036] S1. As shown in the accompanying drawings, the cross-sectional outer contour of any tower column segment i in the embodiment is constructed as a uniaxially symmetrical hexagonal structure, and the horizontal axis X passes through the geometric centroid of the hexagon.

[0037] The hexagon is formed by connecting the B1i side, B2i side, B3i side, B4i side, B5i side and B6i side end to end in sequence. The lengths of the B1i, B2i, B4i and B6i sides decrease linearly along the height of the tower column; the B3i and B5i sides maintain a constant length; the B2i and B6i sides, and the B3i and B5i sides are arranged in mirror symmetry about the horizontal axis X; Where i=1,2,…,n, and the value of i is positively correlated with the construction sequence of the tower column segments.

[0038] S2. Configure six external templates for each tower column segment i, including: MB1i template corresponds to the wrapped B1i edge; The MB2i template corresponds to the wrapped B2i edge; The MB3i template covers the B3i edge accordingly; The MB4i template covers the B4i edge accordingly; MB5i templates cover the B5i edges accordingly; The MB6i template covers the B6i edge accordingly.

[0039] S3. Set the construction parameters of each external template.

[0040] The total width W of each outer formwork satisfies: W=We+Wr, where We is the effective width in contact with concrete, and Wr is the redundant width exceeding the segment profile; (W≥We>0, Wr≥0).

[0041] In this embodiment, for MB1i and MB4i, since the lengths of the sides B1i and B4i decrease linearly along the tower column height, their total width W is constant but the effective width We decreases along the height, or both the total width W and the effective width We decrease along the height and Wr=0.

[0042] For MB2i and MB6i, since the lengths of the sides B2i and B6i decrease linearly along the tower column height, their total width W is constant but the effective width We decreases along the height, or both the total width W and the effective width We decrease along the height and Wr=0.

[0043] For MB3i and MB5i, since the lengths of the edges B3i and B5i remain constant, the total width W of MB3i and MB5i is equal to the effective width We and is constant, that is, Wr=0 always holds true.

[0044] In summary, the template construction parameters of this embodiment are as follows: For MB3i and MB5i templates, the total width W is constant along the tower height and Wr=0.

[0045] For MB2i and MB6i templates, their total width W is constant but the effective width We decreases along the height or both the total width W and the effective width We decrease along the height and Wr=0.

[0046] For MB1i and MB4i templates, their total width W is constant but the effective width We decreases along the height, or both the total width W and the effective width We decrease along the height and Wr=0.

[0047] S4. Establish template cutting judgment rules.

[0048] Define the cutting coefficient q. When q=1, it means cutting is required, and when q=0, it means no cutting is required. When We decreases and Wr=0, q=1; When We decreases and Wr>0, q=0; When We is constant, q=0.

[0049] According to the template construction parameters obtained in step S4, the cutting coefficient q of each template in this embodiment can be inferred as follows: MB3i, MB5i cutting coefficient q = 0, no cutting required; MB1i and MB4i cutting coefficients q = 0 or 1, which still need further judgment; MB2i and MB6i cutting coefficient q=0 or 1, which still needs further judgment.

[0050] S5. Optimize template assembly plan.

[0051] The total amount of template cutting outside each segment Q = Σq is calculated to minimize the Q value, where for any segment i, the Wr corresponding to the MB2i and MB6i templates are equal, and the Wr corresponding to the MB1i and MB4i templates are equal.

[0052] In this embodiment, as shown in the accompanying drawings, Wr(MB2i)=Wr(MB6i)=1930mm>Wr(MB1i)=Wr(MB4i)=7467-6986=481mm.

[0053] Therefore, the total width W of MB2i and MB6i is constant and We decreases along the height; the total width W and We of MB1i and MB4i both decrease along the height and Wr=0.

[0054] The optimal solution satisfies q(MB1i)=1, q(MB2i)=0, q(MB3i)=0, q(MB4i)=1, q(MB5i)=0, q(MB6i)=0. At this time, Q=2, and the theoretical value range of Q is [2,6] and is an even number.

[0055] In this embodiment, the total amount of cutting of the outer template of each segment is Q=Σq=2, which meets the requirements of the optimal solution.

[0056] It should be noted that when assembling the external formwork of each segment, the ends of the formwork can be cut, and the processed ends of the formwork are provided with a connection structure for splicing with adjacent formwork. For example, in this embodiment, the ends where MB2i and MB3i are connected are cut into bevels, and then assembled with MB3i with wooden wedges, connecting rods, etc. to meet the cross-sectional angle requirements, and the same applies to other formwork connections.

[0057] In this embodiment, the cutting conditions are as follows: The bottom surface size of segment i is as follows Figure 5 As shown, the size of each template is the size of the bottom edge of each template in segment i.

[0058] The top surface size of segment i is as follows Figure 6 As shown, the size of each template is the top edge size of each template in segment i.

[0059] The bottom surface size of segment i+1 is as follows Figure 6 As shown, the size of each template is the size of the bottom edge of each template in segment i+1.

[0060] The top surface size of segment i+1 is as follows Figure 7 As shown, the size of each template is the size of the top edge of each template in segment i+1.

[0061] When the construction of segment i is completed and the construction of segment i+1 begins, the templates of segment i will be moved to the corresponding positions of segment i+1. At this time, the templates need to be cut. The specific changes in the size of each template are as follows: The size of the lower base of MB1 and MB4 changes to 240mm, and the size of the upper top changes to 241mm, and they change symmetrically with the X-axis as the axis of symmetry; the size of the lower base of MB2 and MB6 changes to 965mm, and the size of the upper top changes to 965mm, and they change from the end connected to MB1; the sizes of MB3 and MB5 do not change.

[0062] Determine the upper and lower change points of MB1 and MB4 according to the change size, connect the upper and lower change points on the same side of the X-axis, and obtain two shear lines symmetrical about the X-axis. Cut the template along the shear lines.

[0063] In this embodiment, the assembly order of each segment is as follows.

[0064] 1. Since MB3i and MB5i do not change, MB4i is still in the original vertical plane and symmetrical about the X-axis.

[0065] 2. When assembling MB3i and MB5i based on MB4i, MB3i and MB5i need to be tilted inwards to facilitate connection with MB4i.

[0066] 3. Assemble MB2i and MB6i according to the positions of MB3i and MB5i respectively.

[0067] 4. Assemble MB1i based on MB2i and MB6i.

[0068] The remaining sections of the main tower may have different operations due to different section heights, but the core remains unchanged.

[0069] The above-mentioned ideal embodiments according to the present invention are only for enlightenment. Relevant practitioners in this field can make modifications and changes without deviating from the core idea of ​​the present invention.

Claims

1. A method for quickly assembling the outer formwork of a concrete bridge tower with a variable cross-section column, characterized in that: The following steps are involved: S1. Divide the tower column into n segments along the height direction for segmental construction. The cross-sectional outer contour of each tower column segment i is constructed as a uniaxially symmetrical hexagonal structure. The hexagon is formed by sequentially connecting the B1i side, the B2i side, the B3i side, the B4i side, the B5i side and the B6i side end to end, wherein: The lengths of the sides B1i, B2i, B4i, and B6i decrease along the height of the tower column; The B3i and B5i sides maintain constant length; The sides B2i and B6i, and the sides B3i and B5i are arranged in mirror symmetry about the horizontal axis X, which passes through the geometric centroid of the hexagon; Where i = 1, 2, ..., n, and the value of i is positively correlated with the construction sequence of the tower column segments; S2. Configure six external templates for each tower column segment i, including: MB1i template corresponds to the wrapped B1i edge; The MB2i template corresponds to the wrapped B2i edge; The MB3i template corresponds to the B3i edge; The MB4i template covers the B4i edge accordingly; MB5i templates cover the B5i edges accordingly; The MB6i template corresponds to the B6i edge; S3. Set the construction parameters of each external template: The total width W of each outer formwork satisfies: W=We+Wr, where We is the effective width in contact with concrete and Wr is the redundant width beyond the segment profile; For MB3i and MB5i templates, the total width W is constant along the tower column height and Wr=0; For MB2i and MB6i templates, the total width W is constant and We decreases along the height or the total width W and We both decrease along the height and Wr=0; For MB1i and MB4i templates, the total width W is constant and We decreases along the height or the total width W and We both decrease along the height and Wr=0; S4. Establish template cutting judgment rules: Define the cutting coefficient q. When q=1, it means cutting is required, and when q=0, it means no cutting is required. In the cutting judgment rule, when q=1, the template is mechanically cut and then spliced ​​with the adjacent template; when q=0, the template does not need to be cut, and a connection structure is set at the end of the template for splicing with the adjacent template; When We decreases and Wr=0, q=1; When We decreases and Wr>0, q=0; When We is constant, q=0; S5. Optimize template assembly scheme: Calculate the total amount of template cutting outside each segment Q = Σq to minimize the Q value, where for any segment i, the Wr corresponding to the MB2i and MB6i templates are equal, and the Wr corresponding to the MB1i and MB4i templates are equal; When Wr(MB2i)=Wr(MB6i)>Wr(MB1i)=Wr(MB4i), the total width W of MB2i and MB6i is constant and We decreases along the height, and the total width W and We of MB1i and MB4i both decrease along the height and Wr=0; The optimal solution satisfies q(MB1i)=1, q(MB2i)=0, q(MB3i)=0, q(MB4i)=1, q(MB5i)=0, q(MB6i)=0. At this time, Q=2, and the theoretical value range of Q is [2,6] and is an even number. When Wr(MB1i)=Wr(MB4i)>Wr(MB2i)=Wr(MB6i), the total width W of MB1i and MB4i is constant and We decreases along the height, and the total width W and We of MB2i and MB6i both decrease along the height and Wr=0; The optimal solution satisfies q(MB1i)=0, q(MB2i)=1, q(MB3i)=0, q(MB4i)=0, q(MB5i)=0, q(MB6i)=1. At this time, Q=2, and the theoretical value range of Q is [2,6] and is an even number. Then we have: Q=Σq= q(MB1i)+ q(MB2i)+ q(MB3i)+q(MB4i)+q(MB5i)+(MB6i) Where i=1, 2, 3,…, n.

2. A method for rapidly assembling outer formwork of a concrete bridge tower with variable cross-section according to claim 1, characterized in that: The MB3i and MB5i templates use standard templates with equal cross-sections, the MB1i and MB4i templates use trapezoidal detachable templates; the MB2i and MB6i templates use templates with sliding adjustment mechanisms, which can be translated along the horizontal symmetry axis X direction to adapt to changes in Wr.

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