Method for controlling vertical deviation of silo wall in slipform construction

Abstract

The invention relates to the technical field of silo slipform construction, and specifically to a method for controlling vertical deviation of a cylinder wall used in silo slipform construction. The method comprises the following steps: setting a slipform system, comprising a support frame, a lifting frame, a hydraulic lifting system, an operating platform, a template, and a pull rod for fixing the template, wherein a measuring platform is provided on the lower side of the operating platform; a pulley pay-off is fixed on the lower side of the operating platform, a hanging line is wound in the pulley pay-off, and a plumb line is fixed to the end of the hanging line; a plumb line fixing point is provided on the ground corresponding to the plumb line lowering position; a limit box is pre-buried at the plumb line fixing point in the center of the foundation; the plumb line is placed in the limit box, a fixing plate is provided on the upper end of the limit box for fixing the plumb line, a measurement person is located on the measuring platform, and the vertical deviation is measured every time the slipform system rises a certain height; compared with the prior art, the invention can reduce the influence of external factors on verticality measurement errors, improve the quality of silo slipform construction, and reduce the verticality deviation of the cylinder wall.

Description

Technical Field

[0001] The invention relates to the technical field of silo slipform construction, in particular to a method for controlling vertical deviation of a silo wall used in silo slipform construction. Background Art

[0002] Silos have become a crucial structure in my country's national economic development. Slipform construction is a common method used in silo construction. Slipform construction refers to a construction method in which a hydraulic lifting device is used to slide the formwork to cast a vertical concrete structure. For example, in the prior art solution of application number CN200910075584.8, a complete set of hydraulic slipform devices is usually assembled on the ground. Then, a hydraulic jack is used to climb on the support rods, driving the lifting frame, formwork, and operating platform to rise together. After each layer of concrete is poured, the formwork is slid until the structure is cast.

[0003] In slipform construction, it is critical to control the verticality of the cylinder wall. Once a verticality deviation occurs, it is easy for the deviation to accumulate during the climbing process, that is, from bottom to top, the deviation becomes larger and larger. When the deviation is too large, the platform may tilt and become unstable, the formwork may be deformed, and the cylinder concrete may crack, have a skirt, leak, etc. In severe cases, it may even lead to failure of the slipform construction.

[0004] In existing silo slipform construction, a method of hanging a plumb line from top to bottom is usually used to control the verticality of the silo wall formwork. However, the plumb line is easily affected by external factors such as wind, resulting in measurement errors. Therefore, how to avoid external influences such as wind and ensure that the plumb line is always stable during the measurement process is a problem that technical personnel in this field currently need to solve. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a method for controlling the vertical deviation of the cylinder wall for silo slipform construction, which can avoid external influences such as wind and ensure that the vertical line is always stable during the measurement process.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A method for controlling vertical deviation of a silo wall for slipform construction, comprising the following steps:

[0008] S1: Set up the slipform system, including a support frame, a lifting frame, a hydraulic lifting system, an operating platform, a formwork, and tie rods for securing the formwork. Diagonal braces are installed between the operating platform and the ends of the tie rods. A measuring platform is installed below the operating platform, outside the formwork, and is fixed to the diagonal braces via a pull rope. A pulley payout is fixed below the operating platform, with a hanging line wound in the pulley payout and a plumb line fixed to the end of the hanging line. The center of gravity is measured using the plumb line, and a plumb line fixing point is set on the ground corresponding to the plumb line.

[0009] S2: Tie foundation steel bars, embed limit boxes at plumb line fixing points, and pour concrete foundation;

[0010] S3: Place the plumb bob in a limit box. A fixing plate is provided on the upper end of the limit box to fix the plumb bob. After the plumb bob is fixed, the hanging line is in a vertically taut state. During the sliding process, the speed of the pulley pay-off is controlled to keep the hanging line in a vertically taut state.

[0011] S4: The surveyor is located on the measuring platform. Every time the slipform system rises to a certain height, the distance between the hanging line and the outer formwork is measured with a ruler. After each measurement, the difference between the result and the first measurement, i.e. the lowest measurement, is calculated. The difference is the vertical deviation. When the deviation exceeds the preset threshold, the slipform system is immediately adjusted.

[0012] Preferably, a further technical solution of the present invention is:

[0013] Preferably, the operating platform is provided with an opening for construction workers to pass through, and a climbing frame connected to the measuring platform is provided at the opening.

[0014] Preferably, four plumb line fixing points are provided, which are respectively located at the four corners of each group of silos.

[0015] Preferably, before construction, the upper axis is measured in advance on the outer surface of the outer template with a theodolite, and when measuring the distance between the hanging line and the outer template in step S4, the distance from the hanging line to the axis marked on the outer template is measured.

[0016] Preferably, during the sliding process of the sliding form system, a theodolite is used to align the axis marked on the outer formwork for vertical observation day and night, and observation is made once every time the sliding reaches a certain height, and records are kept.

[0017] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features:

[0018] Compared with the existing technology, the present invention can reduce the influence of external factors on the verticality measurement error, improve the construction quality of the silo slipform, reduce the verticality deviation of the cylinder wall, and improve the first-time pass rate of the silo slipform. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the vertical deviation control structure of the silo wall for slipform construction in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the structure of the limit box and the fixed plate in the embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the location of the fixing point of the plummet in the embodiment of the present invention.

[0022] Explanation of the accompanying reference numerals: 1. Support frame; 2. Lifting frame; 3. Operating platform; 4. Formwork; 5. Pull rod; 6. Diagonal brace; 7. Measuring platform; 8. Plumb line; 801, Plumb line fixing point; 9. Foundation; 10. Ruler; 11. Theodolite; 12. Limit box; 13. Fixing plate; 14. Silo. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with specific embodiments. The purpose 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.

[0024] like Figure 1 to, Figure 2 As shown, this embodiment provides a method for controlling the vertical deviation of a silo wall for silo slipform construction, and the steps are as follows:

[0025] S1: Set up a slipform system, including a support frame 1, a lifting frame 2, a hydraulic lifting system, an operating platform 3, a formwork 4, and tie rods 5 for securing the formwork 4. A diagonal brace 6 is installed between the operating platform 3 and the end of the lowest tie rod 5. Below the operating platform 3, outside the formwork 4, a measuring platform 7 is installed, connected to the diagonal brace 6 by a pull rope. A pulley payout is fixed to the operating platform 3, with a hanging line wound in the pulley and a plumb bob 8 fixed to the end of the line. The center of gravity is measured using plumb bob 8, and a plumb bob fixing point 801 is set on the ground corresponding to where plumb bob 8 is placed. The support frame 1 can be raised upward along the lifting frame 2 using the hydraulic lifting system. The operating platform 3 is fixed to the upper portion of the support frame 1, and the formwork 4 is secured to the lifting frame 2 by tie rods 5. The hydraulic lifting system can utilize lifting jacks, hydraulic jacks, or other similar devices. An opening is provided on the operating platform 3 for construction workers to pass through, and a climbing frame connected to the measuring platform 7 is installed at the opening.

[0026] In this embodiment, Figure 3 There are four plumb line fixing points 801, which are located at the four corners of each group of silos 14.

[0027] S2: Tie the foundation 9 steel bars, embed the limit box 12 at the plumb line fixing point 801, and pour the concrete into the foundation 9; the limit box 12 is an open box.

[0028] S3: Place the plumb bob 8 in the limit box 12, and set a fixed plate 13 on the upper end of the limit box 12 to fix the plumb bob 8. The fixed plate 13 consists of two plates, a left plate and a right plate. The left plate and the right plate are both provided with arc grooves. After the left plate and the right plate are assembled together, the two arc grooves are assembled into a hole, and the hole diameter is smaller than the maximum diameter of the plumb bob 8; after the plumb bob 8 is placed in the limit box 12, use the fixed plate 13 to fix the plumb bob 8; after the plumb bob 8 is fixed, the hanging line is in a vertically taut state; it should be noted that during the slipform process, the construction personnel need to control the line-releasing speed of the pulley pay-off so that the hanging line is always in a vertically taut state.

[0029] S4: The surveyor is located on the measuring platform 7. Every time the slipform system rises to a certain height, the distance between the hanging line and the outer formwork 4 is measured using a ruler 10. In this embodiment, the slipform system is measured every time it rises 300 mm. After each measurement, the difference is made between the result of the first measurement, i.e., the lowest measurement, and the difference is the vertical deviation. When the deviation exceeds a preset threshold, the slipform system is immediately adjusted. For example, the vertical deviation threshold is set to ±5 mm. The first measurement result is D1, D1=1200 mm. The second measurement result is D2, D2=1203 mm. The vertical deviation is 3 mm, which is within the allowable range. The third measurement result is D3, D2=1196 mm. The vertical deviation is -4 mm, which is within the allowable range. When the Xth measurement result is DX, DX=1212 mm, the vertical deviation is 12 mm, which exceeds the allowable range and the slipform system needs to be adjusted immediately.

[0030] Before construction, the upper axis is measured in advance on the outer surface of the outer template 4 using the theodolite 11. When measuring the distance between the hanging line and the outer template 4 in step S4, the distance from the hanging line to the axis marked on the outer template 4 is measured.

[0031] During the sliding process of the slipform system, a theodolite 11 is used to align with the axis marked on the outer formwork 4 for vertical observation day and night, and observation is made once every time the sliding reaches a certain height. In this embodiment, observation is made once every time the sliding reaches 1.2m, and the measurement results are recorded. The measurement results of each time can be used as a basis for correction and also as a basis for quality assessment of the slipform concrete.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made by using the contents of the present invention description and the drawings are included in the scope of the present invention.

Claims

1. A method for controlling vertical deviation of a silo wall for slipform construction, characterized in that: Here are the steps: S1: Set up the slipform system, including a support frame, a lifting frame, a hydraulic lifting system, an operating platform, a formwork, and tie rods for securing the formwork. Diagonal braces are installed between the operating platform and the ends of the tie rods. A measuring platform is installed below the operating platform, outside the formwork, and is fixed to the diagonal braces via a pull rope. A pulley payout is fixed below the operating platform, with a hanging line wound in the pulley payout and a plumb line fixed to the end of the hanging line. The center of gravity is measured using the plumb line, and a plumb line fixing point is set on the ground corresponding to the plumb line. S2: Tie foundation steel bars, embed limit boxes at plumb line fixing points, and pour concrete foundation; S3: Place the plumb bob in a limit box. A fixing plate is provided on the upper end of the limit box to fix the plumb bob. After the plumb bob is fixed, the hanging line is in a vertically taut state. During the sliding process, the speed of the pulley pay-off is controlled to keep the hanging line in a vertically taut state. S4: The surveyor is located on the measuring platform. Every time the slipform system rises to a certain height, the distance between the hanging line and the outer formwork is measured with a ruler. After each measurement, the difference between the result and the first measurement, i.e. the lowest measurement, is calculated. The difference is the vertical deviation. When the deviation exceeds the preset threshold, the slipform system is immediately adjusted.

2. The method for controlling vertical deviation of a silo wall for slipform construction according to claim 1, characterized in that: The operating platform is provided with an opening for construction workers to pass through, and a climbing frame connected to the measuring platform is provided at the opening.

3. The method for controlling vertical deviation of a silo wall for slipform construction according to claim 1, characterized in that: There are four plumb bob fixing points, located at the four corners of each group of silos.

4. The method for controlling vertical deviation of a silo wall for slipform construction according to claim 1, characterized in that: Before construction, the upper axis is measured in advance on the outer surface of the outer template using a theodolite. When measuring the distance between the hanging line and the outer template in step S4, the distance from the hanging line to the axis marked on the outer template is measured.

5. The method for controlling vertical deviation of a silo wall for slipform construction according to claim 4, characterized in that: During the sliding process of the sliding formwork system, use a theodolite to align with the axis marked on the outer formwork for vertical observation day and night, observe once every time the sliding reaches a certain height, and keep records.

Images