Silo slip-form construction total cross-section torsion angle measuring and correcting device and control method thereof

Abstract

The invention discloses a silo slip-form construction total cross-section torsion angle measuring and correcting device and a control method of the silo slip-form construction total cross-section torsion angle measuring and correcting device. Comprising slip form supporting rods which are uniformly distributed around the circumference of the silo at intervals, lifting jacks which are arranged on the slip form supporting rods in a penetrating manner, slip form lifting frames which are connected with the lifting jacks and can slide along the slip form supporting rods, and twist correction steel pipes which are arranged between the adjacent slip form supporting rods around the circumference of the silo, the torsion correcting jack is arranged on the torsion correcting steel pipe in a penetrating mode and slides synchronously with the lifting jack, the reinforcing steel bar tensioner is located on the lifting jack, the movable end of the torsion correcting reinforcing steel bar is connected with the reinforcing steel bar tensioner, and the fixed end of the torsion correcting reinforcing steel bar is connected with the torsion correcting jack. Real-time accurate twist correction of the total cross section in the slip-form construction process is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of slipform construction, and in particular to a device for measuring and correcting the full-section torsion angle of a silo slipform construction and a control method thereof. Background Art

[0002] In the single-silo slipform construction process, the torsion of the silo can cause uneven stress on the structure. Certain areas of the silo wall are subjected to additional shear or torque, resulting in uneven stress on the concrete before solidification and abnormal internal stress distribution. This may cause cracks or even structural instability during later use. One of the direct manifestations of silo torsion is the deflection of its support rods along the circumference of the silo, which is mainly caused by the clockwise or counterclockwise torsion of the slipform platform. Since the positioning reference of the silo wall embedded parts is the slipform platform, the torsion deviation of the slipform platform will cause the embedded parts to be misaligned, affecting the construction quality. In addition, the deflection of the support rods of the slipform platform generates additional bending moment, which reduces the stability of its uprights and the supporting capacity, thereby increasing the risk of collapse of the slipform platform.

[0003] In current single-silo slipform construction processes, the main method for measuring slipform torsion is the hanging hammer method, which uses a plumb line. A crosshair, using paint or printed waterproof plastic paper as a base point, is placed at an appropriate location on the bottom of the silo wall. A heavy object is suspended from a platform frame using a rope, controlled by a winch or pulley, and the height is adjusted as the platform rises, allowing for continuous observation. However, the hanging hammer method is significantly affected by wind and weather conditions. Furthermore, as the slipform platform rises, the hanging hammer swings back and forth and is difficult to stop, making it difficult to determine real-time torsion deviation data. Operator observations are easily affected by factors such as rain, wind, fog, and poor lighting during nighttime construction, leading to problems such as difficulty in stopping the hanging hammer's swinging back and forth and poor measurement accuracy. Furthermore, the hanging hammer must be fixed to prevent initial deviation, making it impossible to determine the torsion deviation of the entire silo cross-section. Other existing technologies, such as patent CN201820057064.9, utilize a center-point laser pointer method. A laser is positioned at the center of the planar radial cable of the slipform construction platform, and the laser is emitted downward to determine the difference between the silo's center position and its initial position, thereby obtaining silo deviation data. The defects of this method are as follows: (1) The center position of the silo can only be determined by a laser pointer, and the deviation of the entire cross-section of the silo cannot be determined; (2) After the sliding construction platform starts to slide, the operator cannot reach the center of the plane radial cable. If the laser pointer is blown off by strong wind or gets wet and malfunctions, it will fail and cannot be monitored. (3) The radial cables of the sliding platform have internal forces when the silo is deflected, which will cause axial deformation, resulting in errors in the silo deviation reflected by the center point.

[0004] There are three existing methods for correcting torsion, but all three methods can only correct the torsion qualitatively and rely on experience to correct the torsion of the sliding platform. They cannot accurately or automatically correct the sliding angle.

[0005] The first method: the jack pad method, which adds a pad to the bottom of the jack to make the jack tilt in the opposite direction of the torsion, thereby driving the support rod and the slipform platform to correct the torsion; the jack pad method can only correct the torsion qualitatively, and the thickness of the pad depends on the workers' experience, and cannot form an accurate quantitative relationship; it is easy to cause poor torsion correction effect or excessive torsion, affecting the construction quality.

[0006] The second method, the torsion-resistant channel method, involves welding two No. 10 steel channels perpendicular to the lower crossbeam of the lifting frame to form the torsion-resistant channel. The channel extends 900mm into the concrete. During the formwork lifting process, the channel slowly rises with the lifting frame, 300mm at a time. After each form is lifted, 600mm remains submerged in the concrete. This 600mm of concrete must not initially set, otherwise the formwork platform cannot be raised during further construction or the concrete in the silo wall may crack. In actual construction, extended intervals between raising the formwork platform are common, especially when concrete is not delivered in a timely manner, when operations are suspended due to strong winds and heavy rain, or when lifting is stopped due to silo verticality deviation or other reasons. If the fixed end of the torsion-resistant channel is filled with unset concrete, the torsion-resistant effect is greatly reduced, and the success rate of torsion correction cannot be guaranteed.

[0007] The third method is the wire rope fall chain method, such as patent CN113293989A. When the platform twists clockwise, tighten the wire rope fall chain so that all the door frames tend to tilt counterclockwise. As the sliding formwork is lifted, the platform will gradually return to its original position. When the platform twists counterclockwise, adjust the door frames in the offset direction in the opposite direction, and the platform will reset as it is lifted. The wire rope fall chain of the wire rope fall chain method blocks the construction space, making it impossible to tie steel bars, place embedded parts, and clean up concrete that has fallen on the edge of the platform. Therefore, the torsion can only be corrected when the platform is sliding. When the platform stops sliding, the wire rope fall chain must be removed for construction and then installed again when it is sliding, which is labor-intensive. Moreover, it is difficult to accurately judge the tendency of the platform to twist and tilt, resulting in insufficient or excessive torsion correction.

[0008] Therefore, the above problems need to be solved urgently. Summary of the Invention

[0009] Purpose of the invention: The purpose of the present invention is to provide a device for measuring and correcting the full-section torsion angle of a silo slipform construction, so as to realize real-time and accurate torsion correction of the full section during the slipform construction process.

[0010] Technical solution: To achieve the above objectives, the present invention discloses a full-section torsion angle measurement and correction device for silo slipform construction, comprising slipform support rods evenly spaced around the circumference of the silo, lifting jacks passed through the slipform support rods, a slipform lifting frame connected to the lifting jacks and slidable along the slipform support rods, torsion correction steel pipes arranged between adjacent slipform support rods around the circumference of the silo, torsion correction jacks passed through the torsion correction steel pipes and sliding synchronously with the lifting jacks, a steel bar tensioner located on the lifting jack, and a torsion correction steel bar whose movable end is connected to the steel bar tensioner and whose fixed end is connected to the torsion correction jack.

[0011] Optionally, the circumference of the silo is 50 to 90 m, the spacing between adjacent sliding form support rods is 1.3 to 1.5 m, and the torsion correction steel pipe is located at the center of adjacent sliding form support rods.

[0012] Optionally, it is characterized in that the torsion-correcting steel pipe is filled with mortar.

[0013] Optionally, the steel bar tensioner includes a Class A steel bar tensioner for clockwise twisting and a Class B steel bar tensioner for counterclockwise twisting, the twisting steel bars include Class A twisting steel bars and Class B twisting steel bars, the Class A steel bar tensioner is connected to the Class A twisting steel bars, and the Class B steel bar tensioner is connected to the Class B twisting steel bars.

[0014] Optionally, the twist-correcting steel bars are HPB300 grade hot-rolled round steel bars with a diameter of 8 to 10 mm.

[0015] Optionally, a steel bar force gauge for measuring steel bar stress is provided on the torsion correction steel bar near the lifting jack. The steel bar force gauge is connected to the controller. The controller calculates the torsion angle of each section of the slipform platform between adjacent slipform support rods based on the measured steel bar stress, and controls the steel bar tensioner to relax until the torsion angle is lower than the preset target torsion correction angle.

[0016] Optionally, the initial steel bar stress measured by the steel bar force meter is σ, the current steel bar stress measured by the steel bar force meter is σˊ, and the torsion angle of each section of the sliding form platform between adjacent sliding form support rods is R is the radius of the silo, ΔL is the deformation of the torsion steel bar, E is the elastic modulus of the torsion-correcting steel bar, Δσ is the change in the stress of the torsion-correcting steel bar, σˊ is the current stress of the steel bar measured by the steel bar force gauge, and σ is the initial stress of the steel bar measured by the steel bar force gauge.

[0017] Optionally, the torsion correcting jack and the lifting jack are respectively connected to a hydraulic system, and the hydraulic system synchronously drives the torsion correcting jack and the lifting jack to slide.

[0018] Based on the same inventive concept, the present invention discloses a control method for a device for measuring and correcting the full-section torsion angle of a silo slipform construction, comprising the following steps:

[0019] After the silo slipform platform is assembled, a torsion-correcting steel pipe is installed at the center of two adjacent slipform support rods. The torsion-correcting jack is installed on the torsion-correcting steel pipe, and the torsion-correcting jack is lifted synchronously with the lifting jack.

[0020] Pour mortar into the torsion-correcting steel pipe to the top of the torsion-correcting jack; cut two sections of torsion-correcting steel bars according to the distance between each section of the torsion-correcting jack and the lifting jack; set a steel bar force gauge on the end of the two sections of torsion-correcting steel bars close to the lifting jack; the steel bar force gauge is connected to the controller; the length of each section of torsion-correcting steel bars is L, and the target torsion angle θ′ is preset. The target torsion angle θ′ and the length of each section of torsion-correcting steel bars L are transmitted to the controller;

[0021] Install a steel bar tensioner on each lifting jack, connect the free end of the torsion-correcting steel bar to the steel bar tensioner, connect the fixed end of the torsion-correcting steel bar to the torsion-correcting jack, and connect the steel bar tensioner to the controller through a cable data line;

[0022] The controller obtains the value of each steel bar force gauge and controls the steel bar tensioner to adjust the elongation of the twisting steel bar by tensioning it, so that the initial stress of each section of twisting steel bar is adjusted to below 0.1Mpa in the steel bar force gauge.

[0023] The steel bar force gauge measures the steel bar stress data in real time. The current steel bar stress measured by the steel bar force gauge is σˊ, which is compared with the initial steel bar stress σ of the torsion-correcting steel bar on the sliding platform to obtain the steel bar stress change Δσ of the torsion-correcting steel bar. Based on the steel bar stress change, the controller calculates the torsion angle of each section of the sliding platform between adjacent sliding support rods. If the torsion angle θ exceeds the preset target torsion angle, the controller controls the steel bar tensioner corresponding to the torsion correction direction. The steel bar tensioner slowly relaxes, so that the torsion-correcting steel bar does not slide in the steel bar tensioner. The elastic deformation begins to shrink, the internal tensile stress of the steel bar decreases, the stress value of the steel bar force gauge begins to decrease, and the torsion angle θ of the sliding platform begins to decrease. When the θ value reaches θ′, the steel bar tensioner stops relaxing and clamps the steel bar to complete the torsion correction.

[0024] Optionally, the torsion angle of each section of the sliding platform between the adjacent sliding support rods is R is the radius of the silo, ΔL is the deformation of the torsion steel bar, E is the elastic modulus of the torsion reinforcement.

[0025] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: the present invention utilizes the relationship between stress and strain of steel bars and the mathematical arc length formula, and reflects the torsion angle of the slipform platform and the silo through the elastic deformation of the torsion correction steel bars that form a circle around the silo at the jack height of the slipform lifting frame. The elastic deformation of the stretched torsion correction steel bars caused by the torsion of the silo and the slipform platform is restored, which drives the slipform platform to correct the angle in the opposite torsion direction of the silo, thereby realizing full-section digital torsion correction; the circle of torsion correction steel bars of the present invention is located at the height of the lifting frame jack, which will not affect the construction work such as tying steel bars, installing embedded parts, and cleaning concrete dropped on the edge of the platform, and there is no need to install and remove the torsion correction steel bars once for each torsion correction, which saves time and labor and has low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a plane schematic diagram in which a straight line is used instead of a curved line in the present invention;

[0027] Figure 2 It is a partial plan view of the present invention;

[0028] Figure 3 for Figure 2 Cross-sectional view of AA;

[0029] Figure 4 for Figure 2 Cross-sectional view of the middle BB;

[0030] Figure 5 for Figure 4 Cross-sectional view of CC;

[0031] Figure 6 This is a schematic diagram of the counterclockwise twisting in the present invention;

[0032] Figure 7 This is a schematic diagram of the present invention after correcting the torsion angle clockwise. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0034] like Figure 2 、 Figure 3 、 Figure 4 and Figure 5As shown, the present invention discloses a device for measuring and correcting the full-section torsion angle of a silo slipform construction, comprising a slipform support rod 1, a lifting jack 2, a slipform lifting frame 3, a torsion correction steel pipe 4, a torsion correction jack 5, a steel bar tensioner, torsion correction steel bars, a controller 12, and a hydraulic system. The slipform support rods 1 are evenly spaced around the circumference of the silo 11, and the lifting jacks 2 are mounted on the slipform support rods 1. The lifting jacks 2 can slide along the slipform support rods 1. The lifting jacks 2 are connected to the slipform lifting frame 3, and the slipform lifting frame 3 slides along the slipform support rods 1 along with the lifting jacks 2. The slipform lifting frame 3 is an existing I-shaped slipform lifting frame, and the lifting jacks 2 are fixed to the crossbeam of the slipform lifting frame 3. The torsion-correcting steel pipes 4 are evenly spaced around the circumference of the silo 11. The torsion-correcting steel pipes 4 are arranged between adjacent slipform support rods 1 and are located in the center of adjacent slipform support rods 1. The circumference of the silo is 50 to 90 meters, and the spacing between adjacent slipform support rods 1 is 1.3 to 1.5 meters. The torsion-correcting steel pipes 4 are filled with mortar 13. The torsion-correcting jacks 5 are passed through the torsion-correcting steel pipes 4. The torsion-correcting jacks 5 can slide along the torsion-correcting steel pipes 4. The torsion-correcting jacks 5 and the lifting jacks 2 are respectively connected to the hydraulic system, and the hydraulic system synchronously drives the torsion-correcting jacks 5 and the lifting jacks 2 to slide. The steel bar tensioner is located on the lifting jack, the movable end of the torsion-correcting steel bar is connected to the steel bar tensioner, and the fixed end of the torsion-correcting steel bar is connected to the torsion-correcting jack. One end of the torsion-correcting rebar is butt-welded to the bolts on the torsion-correcting jack's base plate, ensuring a secure connection to the torsion-correcting jack and serving as the fixed end. The other end of the torsion-correcting rebar is connected to a rebar tensioner, which adjusts its elongation according to the tension of the rebar tensioner, keeping it taut and used to zero the initial stress on the rebar. Initially, the stress σ of each section of torsion-correcting rebar is set below 0.1 MPa in the rebar dynamometer. This ensures that the rebar is under tension, but the tension does not cause millimeter-level displacement of the slipform support rods and the torsion-correcting steel pipe. When the rebar tensioner tightens the torsion-correcting rebar, the slipform platform twists, causing the rebar to elastically deform and elongate under tension without slipping. This prevents inaccurate measurement of the torsion angle of the slipform platform and silo due to stress loss. Furthermore, during torsion correction, the rebar tensioner gradually relaxes, allowing the rebar to correct the torsion of the slipform platform and silo through its own elastic recovery without slipping. The rebar tensioners and force gauges are located next to the upper flange of the sliding formwork lifting frame beam. This allows the branch cables, data lines, and the main cable to be routed through the upper flange of the sliding formwork lifting frame beam, eliminating the need for construction work below, such as tying rebar, placing embedded parts, and cleaning concrete that has fallen off the platform. A controller is located on the sliding formwork platform, connected to the main cable, to control all the rebar force gauges and rebar tensioners.The device for measuring and correcting the torsion angle of the entire cross-section of the silo slipform construction adopted by the present invention has few structural consumables, a high turnover rate and low cost. The torsion correction steel bar is about 0.7 meters long, and the short waste steel bars left over from the construction site are directly utilized; the torsion correction steel pipe is made of the same material as the slipform support rod, is easy to obtain and has low cost; the steel bar force gauge and steel bar tensioner are small in size, inexpensive and can be used in a turnover manner; the torsion correction jack and the lifting jack are of the same model, are easy to obtain and can be used in a turnover manner, and have low cost.

[0035] The slipform lifting frame, lifting jack and slipform support rod are a tightly connected whole. When the silo is twisted clockwise or counterclockwise, the whole will inevitably twist at the same angle. According to the requirements of the slipform construction specifications and engineering economic considerations, the spacing between the slipform support rods is 1.3 to 1.5 meters, preferably 1.4 meters. The torsion-correcting steel pipe is located between the two slipform support rods, so that the silo circumference segment length is 0.65 to 0.75 meters. Compared with the silo's circumference length of 50 to 90 meters, the spacing between the slipform support rods and the torsion-correcting steel pipe is used as the secant of the circle with the idea of replacing the curve with a straight line. Its length is approximately equal to the arc length of the silo between the slipform support rods and the torsion-correcting steel pipe. Figure 1 As shown in the figure. Since the torsion-correcting steel pipe is filled with mortar, its rigidity is much greater than that of the slipform support rod. Therefore, the torsion-correcting steel pipe will always remain in a vertical state, serving as the fixing point of one end of the torsion-correcting steel bar. The other end of the torsion-correcting steel bar is connected to the steel bar tensioner, which is fixed to the lifting jack by bolts. The steel bar tensioner relaxes the steel bar, recovering the elastic deformation caused by the torsion of the silo, driving the whole composed of the slipform lifting frame, lifting jack and slipform support rod to rotate clockwise or counterclockwise, so that the torsion of the slipform platform and silo can be restored.

[0036] When the silo and slipform platform twist, the ratio of the change in the spacing between the slipform support rods and the twist-correcting steel tubes (ΔL) to the silo radius (R) can reflect the twist angle θ of the slipform platform and silo, according to the arc length formula. The change in the spacing between the slipform support rods and the twist-correcting steel tubes (ΔL) is also the deformation of the twist-correcting steel bars. Therefore, by monitoring the change in the spacing between the slipform support rods and the twist-correcting steel tubes—that is, monitoring the deformation of the twist-correcting steel bars—the silo's twist angle can be accurately measured. The twist-correcting steel bars can then adjust the spacing between the slipform support rods and the twist-correcting steel tubes, driving the slipform platform to perform clockwise or counterclockwise angular correction. This correction is then applied to each section of the silo's cross-section between the slipform support rods and the twist-correcting steel tubes, ultimately correcting the entire silo's twist.

[0037] The rebar tensioner includes a Class A rebar tensioner 6 for clockwise twist correction and a Class B rebar tensioner 7 for counterclockwise twist correction. The twist correction rebar includes a Class A twist correction rebar 8 and a Class B twist correction rebar 9. The Class A rebar tensioner 6 is connected to the Class A twist correction rebar 8, and the Class B rebar tensioner 7 is connected to the Class B twist correction rebar 9. The Class A rebar tensioner 6 and the Class B rebar tensioner 7 are respectively arranged on both sides of the lifting jack. The Class A rebar tensioner 6 and the Class B rebar tensioner 7 are fixed to the bottom plate of the lifting jack with bolts for easy installation and removal. The rebar tensioner can tighten and slowly loosen the twist correction rebar to prevent the twist from slipping. The Class A rebar tensioner and the Class A twist correction rebar are used when the silo and the slipform platform are twisted clockwise and need to be corrected counterclockwise. The Class B rebar tensioner and the Class B twist correction rebar are used when the silo and the slipform platform are twisted counterclockwise and need to be corrected clockwise. Class A torsion correction steel bars 8 and Class B torsion correction steel bars 9 are both HPB300 grade hot-rolled round steel bars with a diameter of 8 to 10 mm. This type of steel bar has good ductility and toughness and can maintain an elastic deformation state within a large strain range. Experiments have shown that the tension generated by the elastic deformation of a hot-rolled round steel bar with a diameter of 8 mm and a length of about 700 mm can cause the slipform support rod to deviate by 1 to 30 mm, meeting the angle requirement for a single slipform torsion correction. Class A steel bar tensioners 6 and Class B steel bar tensioners 7 can use a steel strand threading machine, the aperture of which is 8 to 10 mm of the diameter of the torsion correction steel bar. A steel bar force gauge 10 for measuring steel bar stress is provided on the torsion correction steel bar near the lifting jack. The steel bar force gauge is connected to a controller. The controller calculates the torsion angle of each section of the slipform platform between adjacent slipform support rods based on the measured steel bar stress, and controls the steel bar tensioner to relax until the torsion angle is lower than the preset target torsion correction angle. The initial steel bar stress measured by the steel bar force meter 10 is σ, the current steel bar stress measured by the steel bar force meter is σˊ, and the torsion angle of each section of the sliding form platform between adjacent sliding form support rods is R is the radius of the silo, ΔL is the deformation of the torsion steel bar, E is the elastic modulus of the torsion-correcting steel bar, Δσ is the change in the stress of the torsion-correcting steel bar, σˊ is the current stress of the steel bar measured by the steel bar force gauge, and σ is the initial stress of the steel bar measured by the steel bar force gauge.

[0038] The present invention utilizes the relationship between stress and strain of steel bars and the mathematical arc length formula, and reflects the torsion angle between the sliding formwork platform and the silo through the elastic deformation of the torsion correction steel bars that form a circle around the silo at the height of the lifting jack of the sliding formwork lifting frame. The elastic deformation of the stretched torsion correction steel bars caused by the torsion of the silo and the sliding formwork platform is restored, which drives the sliding formwork platform to correct the angle in the opposite torsion direction of the silo, thereby realizing full-section digital torsion correction. At the same time, a circle of torsion correction steel bars is located at the height of the lifting jack, which will not affect the construction work such as tying steel bars, installing embedded parts, and cleaning concrete dropped on the edge of the platform. There is no need to install and remove the torsion correction steel bars once for each torsion correction, which saves time and labor and is low in cost. The present invention sets a controller and lays a cable data line around the silo to control the steel bar tensioner and monitor the steel bar stress with a steel bar force gauge, thereby realizing electrical measurement and automatic correction of torsion angle.

[0039] like Figure 6 and Figure 7 As shown, the present invention discloses a control method for a full-section torsion angle measurement and correction device for silo slipform construction, comprising the following steps:

[0040] After the silo slipform platform is assembled, a torsion-correcting steel pipe is installed at the center of two adjacent slipform support rods. The torsion-correcting jack is installed on the torsion-correcting steel pipe, and the torsion-correcting jack is lifted synchronously with the lifting jack.

[0041] After pouring the first concrete to a height of approximately 900mm, mortar is poured into the torsion-correcting steel pipe to the top of the torsion-correcting jack. Two sections of torsion-correcting steel bars are cut according to the distance between each section of the torsion-correcting jack and the lifting jack. A steel bar force gauge is installed on the end of each section of torsion-correcting steel bars close to the lifting jack. The steel bar force gauge is connected to the controller. The length of each torsion-correcting steel bar is L, and the target torsion angle θ′ is preset. The target torsion angle θ′ and the length of each section of torsion-correcting steel bar L are transmitted to the controller.

[0042] While waiting for the initial setting of the bottom 600mm height of the first poured concrete, install a steel tensioner on each lifting jack, connect the free end of the torsion-correcting steel bar to the steel tensioner, and the fixed end of the torsion-correcting steel bar to the torsion-correcting jack. The steel tensioner is connected to the controller via a cable data line.

[0043] The controller obtains the value of each steel bar force gauge and controls the steel bar tensioner to adjust the elongation of the twisting steel bar through tension to tighten it. Since the twisting steel pipe is poured with mortar, the bending stiffness of the twisting steel pipe is greatly increased. At this time, the twisting steel pipe still maintains its original vertical state. The initial stress of each section of twisting steel bar is adjusted to below 0.1Mpa in the steel bar force gauge. In this way, the steel bar is under tension, but its tension cannot cause millimeter-level displacement on the sliding support rod and the twisting steel pipe, achieving zero stress on the steel bar in the initial stage.

[0044] The subsequent sliding platform begins to enter the normal sliding stage, with each sliding height of 200 to 300 mm; the steel bar force gauge measures the steel bar stress data in real time; if the sliding support rod twists clockwise or counterclockwise, the torsion steel bars on both sides of the torsion steel pipe will undergo elastic deformation, with one side experiencing increased tensile stress and the other side experiencing compressive stress; each time the sliding of the sliding platform stops, the steel bar force gauge measures the current steel bar stress as σˊ, and compares it with the initial steel bar stress σ of the torsion steel bar of the sliding platform to obtain the steel bar stress change Δσ of the torsion steel bar; the Δσ of the torsion steel bar on the side with increased tensile stress will be greater than 0; all values with Δσ greater than 0 and their torsion steel bar numbers are displayed on the control screen corresponding to the controller; based on the steel bar stress change, the controller calculates the torsion angle of each section of the sliding platform between adjacent sliding support rods R is the radius of the silo, ΔL is the deformation of the torsion steel bar, E is the elastic modulus of the torsion-correcting steel bars. The controller displays the torsion angle θ between each section of the sliding support bars on the corresponding control screen of the controller. If θ exceeds the preset target torsion angle each time the sliding platform stops, correction is required.

[0045] According to the "Sliding Formwork Engineering Technical Standard", the lifting distance of the sliding formwork platform each time is 200 to 300 mm; when the sliding formwork platform stops sliding and the torsion angle needs to be corrected, the torsion correction is started according to the preset target torsion angle θ′. θ′ should be within 50% of the limit value of the "Sliding Formwork Engineering Technical Standard" to ensure the torsion correction effect; the controller controls the steel bar tensioner corresponding to the torsion correction direction, and the steel bar tensioner begins to slowly relax, so that the torsion correction steel bar does not slide in the steel bar tensioner, and the elastic deformation begins to shrink, the tensile stress in the steel bar decreases, the stress value of the steel bar dynamometer begins to decrease, and at the same time, the torsion angle θ of the sliding formwork platform begins to decrease. When the θ value reaches θ′, the steel bar tensioner stops relaxing and clamps the steel bar, completing the torsion correction;

[0046] For example, a silo and a slipform platform are twisted counterclockwise. To correct the angle of the silo and the slipform platform clockwise, the controller calculates the twist angle θ of each section of the slipform platform between adjacent slipform support rods based on the measured steel bar stress. The controller controls the steel bar tensioner to tighten until the twist angle θ is lower than the preset target twist angle θ′. The Class B steel bar tensioner slowly relaxes, and the Class B twisting steel bar elastically deforms and shrinks, while the Class A steel bar tensioner does not move. The steel bar stress change Δσ in the steel bar force gauge of the Class B twisting steel bar decreases, and the steel bar stress change Δσ in the steel bar force gauge of the Class A twisting steel bar increases from a negative value to a positive value. In the clockwise direction, the distance between the slipform lifting rod and the twisting steel pipe shortens, driving the slipform platform to correct clockwise, and the twist angle of the slipform platform is corrected to θ′.

[0047] The twist correction process can also be performed when the sliding platform is sliding up, to avoid the silo concrete sticking to the sliding formwork due to excessive twist correction time leading to excessive sliding stop time; if the θ value has not reached θ′ when the sliding platform stops sliding the next time, the controller will continue to perform the twist correction operation until the θ value reaches θ′;

[0048] The extension method of the torsion correction steel pipe is the same as that of the sliding support rod. Both methods are to add a steel pipe with a smaller diameter and insert its small end into the original steel pipe.

Claims

1. A device for measuring and correcting the full-section torsion angle of a silo slipform construction, characterized in that: The invention comprises sliding form support rods (1) uniformly spaced around the circumference of a silo, lifting jacks (2) passing through the sliding form support rods, sliding form lifting frames (3) connected to the lifting jacks and capable of sliding along the sliding form support rods, torsion correcting steel pipes (4) arranged between adjacent sliding form support rods around the circumference of the silo, torsion correcting jacks (5) passing through the torsion correcting steel pipes and sliding synchronously with the lifting jacks, a steel bar tensioner located on the lifting jacks, and a torsion correcting steel bar having a movable end connected to the steel bar tensioner and a fixed end connected to the torsion correcting jack.

2. A device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 1, characterized in that: The circumference of the silo is 50 to 90 m, the spacing between adjacent sliding form support rods (1) is 1.3 to 1.5 m, and the torsion correction steel pipe (4) is located at the center of adjacent sliding form support rods (1).

3. The device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 1 is characterized in that: The twist-correcting steel pipe (4) is filled with mortar.

4. A device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 1, characterized in that: The steel bar tensioner comprises a Class A steel bar tensioner (6) for clockwise twisting and a Class B steel bar tensioner (7) for counterclockwise twisting. The twisting steel bars comprise a Class A twisting steel bar (8) and a Class B twisting steel bar (9). The Class A steel bar tensioner (6) is connected to the Class A twisting steel bar (8), and the Class B steel bar tensioner (7) is connected to the Class B twisting steel bar (9).

5. The device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 1 is characterized in that: The twist-correcting steel bars are HPB300 grade hot-rolled round steel bars with a diameter of 8 to 10 mm.

6. The device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 1 is characterized in that: A steel bar force meter (10) for measuring steel bar stress is provided on the torsion-correcting steel bar near the lifting jack. The steel bar force meter is connected to a controller. The controller calculates the torsion angle of each section of the slipform platform between adjacent slipform support rods based on the measured steel bar stress, and controls the steel bar tensioner to relax until the torsion angle is lower than a preset target torsion-correcting angle.

7. A device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 6, characterized in that: The initial steel bar stress measured by the steel bar force meter (10) is σ, the current steel bar stress measured by the steel bar force meter is σ′, and the torsion angle of each section of the sliding form platform between adjacent sliding form support rods is R is the radius of the silo, ΔL is the deformation of the torsion steel bar, E is the elastic modulus of the torsion-correcting steel bar, Δσ is the change in the stress of the torsion-correcting steel bar, σ′ is the current stress of the steel bar measured by the steel bar force gauge, and σ is the initial stress of the steel bar measured by the steel bar force gauge.

8. The device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 1 is characterized in that: The torsion correcting jack (5) and the lifting jack (2) are respectively connected to a hydraulic system, and the hydraulic system synchronously drives the torsion correcting jack (5) and the lifting jack (2) to slide.

9. A control method for the device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claims 1 to 8, characterized in that: The steps include: After the silo slipform platform is assembled, a torsion-correcting steel pipe is installed at the center of two adjacent slipform support rods. The torsion-correcting jack is installed on the torsion-correcting steel pipe, and the torsion-correcting jack is lifted synchronously with the lifting jack. Pour mortar into the torsion-correcting steel pipe to the top of the torsion-correcting jack; cut two sections of torsion-correcting steel bars according to the distance between each section of the torsion-correcting jack and the lifting jack; set a steel bar force gauge on the end of the two sections of torsion-correcting steel bars close to the lifting jack; the steel bar force gauge is connected to the controller; the length of each section of torsion-correcting steel bars is L, and the target torsion angle θ′ is preset. The target torsion angle θ′ and the length of each section of torsion-correcting steel bars L are transmitted to the controller; Install a steel bar tensioner on each lifting jack, connect the free end of the torsion-correcting steel bar to the steel bar tensioner, connect the fixed end of the torsion-correcting steel bar to the torsion-correcting jack, and connect the steel bar tensioner to the controller through a cable data line; The controller obtains the value of each steel bar force gauge and controls the steel bar tensioner to adjust the elongation of the twisting steel bar by tensioning it, so that the initial stress of each section of twisting steel bar is adjusted to below 0.1Mpa in the steel bar force gauge. The steel bar force gauge measures the steel bar stress data in real time. The current steel bar stress measured by the steel bar force gauge is σ′, which is compared with the initial steel bar stress σ of the torsion-correcting steel bar on the sliding platform to obtain the steel bar stress change Δσ of the torsion-correcting steel bar. Based on the steel bar stress change, the controller calculates the torsion angle of each section of the sliding platform between adjacent sliding support rods. If the torsion angle θ exceeds the preset target torsion angle, the controller controls the steel bar tensioner in the corresponding torsion correction direction. The steel bar tensioner slowly relaxes, so that the torsion-correcting steel bar does not slide in the steel bar tensioner. The elastic deformation begins to shrink, the tensile stress in the steel bar decreases, the stress value of the steel bar force gauge begins to decrease, and the torsion angle θ of the sliding platform begins to decrease. When the θ value reaches θ′, the steel bar tensioner stops relaxing and clamps the steel bar to complete the torsion correction.

10. The control method of the device for measuring and correcting the full-section torsion angle of a silo slipform construction according to claim 9, characterized in that: The torsion angle of each sliding platform between adjacent sliding support rods R is the radius of the silo, ΔL is the deformation of the torsion steel bar, E is the elastic modulus of the torsion reinforcement.

Images