Concrete prefabricated column demolding overturning auxiliary device and using method thereof

Abstract

The invention discloses a concrete prefabricated column demoulding turnover auxiliary device and a using method thereof, the concrete prefabricated column demoulding turnover auxiliary device is used for being installed on a stress column body, the stress column body is a part between one end, farthest from a turnover lifting point, of a concrete prefabricated column and the turnover lifting point, and the stress column body comprises an installation frame, a first stress arm and a second stress arm, and the first stress arm and the second stress arm are oppositely arranged on the installation frame; the two ends of the first stress arm and the two ends of the second stress arm are provided with contact assemblies. During installation, the first force-bearing arm and the second force-bearing arm are both parallel to the force-bearing column body, and the first force-bearing arm and the second force-bearing arm are detachably arranged on the lower half faces of the two opposite side faces, in the horizontal direction, of the force-bearing column body respectively through respective contact assemblies. And the lower half surface is a part of the stressed column body falling below the horizontal plane where the central axis of the stressed column body is located on the two opposite side surfaces in the horizontal direction. According to the method, the construction cost is controlled, and meanwhile, the concrete prefabricated column with the high slenderness ratio is effectively prevented from being excessively deformed or cracked during demolding and overturning.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a demoulding and turning auxiliary device for a prefabricated concrete column and a use method thereof. Background Art

[0002] Precast concrete columns are manufactured in advance in factories or prefabrication sites, and then transported to the construction site for installation. Precast concrete columns are one type of precast concrete components. During the production process, precast concrete columns go through the processes of steel cage binding, end mold installation, concrete pouring, and mold closing. When used at the construction site, the precast concrete columns need to be demolded and flipped by a crane.

[0003] When flipping, a flipping hanging point is generally set at the top or the upper middle part of the precast concrete column, and the lower edge of the precast concrete column is used as the flipping point; during the flipping process, the precast concrete column is in a tilted state; the upward pulling force of the lifting and the gravity of the precast concrete column will form tensile stress between the upper and lower surfaces of the precast concrete column. When the tensile stress exceeds the standard value of the tensile strength of concrete, it will cause excessive deformation or cracking of the precast concrete column.

[0004] Especially for the slender and relatively tall precast concrete columns, the single-point lifting method alone cannot avoid excessive deformation or cracking. For this reason, there are two existing solutions: double-point lifting and back-type steel frame auxiliary operation.

[0005] Among them, the double-lifting point lifting solution requires two lifting devices, and the construction cost is too high. When the back-type steel frame is in use, the precast concrete parts themselves still have to bear tension. The back-type steel frame only converts the upper and lower tensile stresses into the axial direction. For the precast concrete columns with ultra-high slenderness ratios in application scenarios such as substations, the back-type steel frame cannot prevent excessive deformation or cracking of the precast concrete columns. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a demoulding and flipping auxiliary device for a precast concrete column and a method for using the same, which can effectively prevent excessive deformation or cracking of a precast concrete column with a high aspect ratio during demoulding and flipping while controlling construction costs.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is: A demoulding and flipping auxiliary device for a precast concrete column, which is used to be installed on a load-bearing column, wherein the load-bearing column is a portion between an end of the precast concrete column farthest from a flipping hanging point in a horizontal state and the flipping hanging point, and comprises a mounting frame and a first load-bearing arm and a second load-bearing arm arranged opposite to each other on the mounting frame; Both ends of the first force-bearing arm and both ends of the second force-bearing arm are provided with contact components; During installation, the first force-bearing arm and the second force-bearing arm are both parallel to the force-bearing column, and the first force-bearing arm and the second force-bearing arm are detachably arranged on the lower half surfaces of the two opposite side surfaces of the force-bearing column in the horizontal direction through their respective contact assemblies, and the lower half surfaces are the parts of the two opposite side surfaces of the force-bearing column in the horizontal direction that fall below the horizontal plane where the central axis of the force-bearing column is located.

[0008] In order to solve the above technical problems, another technical solution adopted by the present invention is: A method for using a demoulding and flipping auxiliary device for a precast concrete column, which is applied to the above-mentioned demoulding and flipping auxiliary device for a precast concrete column, comprises the following steps: S1, controlling the mounting frame to align with the load-bearing column close to the precast concrete column, so that the first load-bearing arm and the second load-bearing arm respectively correspond to the lower halves of the two opposite side surfaces of the load-bearing column in the horizontal direction; S2. Removably fixing the first force-bearing arm and the second force-bearing arm to the lower half surface through a contact assembly, so that the mounting frame is fixed on the force-bearing column; S3. After the precast concrete column is demoulded and turned over, the connection of the contact assembly is released and the mounting bracket is removed from the load-bearing column.

[0009] The beneficial effects of the present invention are as follows: a demoulding and flipping auxiliary device for a precast concrete column and a method for using the same are provided, the device comprises a mounting frame and a first force-bearing arm and a second force-bearing arm which are relatively arranged on the mounting frame. The device as a whole is installed in a straddling manner, the first force-bearing arm and the second force-bearing arm are respectively connected to two opposite side surfaces of the force-bearing column of the precast concrete column in the horizontal direction, and at the same time, it is ensured that the first force-bearing arm and the second force-bearing arm are both located below the horizontal plane where the central axis of the force-bearing column is located, so that when the precast concrete column is demoulded and flipped, the first force-bearing arm and the second force-bearing arm can first replace the force-bearing column to bear part of the tensile stress generated during flipping, so that the tensile stress on the precast concrete column is significantly reduced, and the single hanging point operation is still used, while controlling the construction cost, effectively preventing the precast concrete column with a high slenderness ratio from excessive deformation or cracking during demoulding and flipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of installing a demoulding and turning auxiliary device for a precast concrete column of the present invention on a precast concrete column; Figure 2 It is a schematic diagram of the cooperation between a demoulding and turning auxiliary device for a precast concrete column and a lifting device of the present invention; Figure 3It is a schematic diagram of the alignment of a mounting frame of a demoulding and turning auxiliary device for a precast concrete column and a precast concrete column according to the present invention; Figure 4 It is a schematic diagram of the flipping state of a precast concrete column after the demoulding and flipping auxiliary device of a precast concrete column of the present invention is installed; Figure 5 It is a schematic diagram of disassembling a demoulding and turning auxiliary device for a precast concrete column of the present invention after the precast concrete column has been turned over; Figures 6 to 8 The present invention is a joint component of a concrete precast column demoulding and flipping auxiliary device. Schematic diagram of the installation process on the load-bearing column of the precast concrete column; Figures 9 to 11 It is a schematic diagram of the installation process of a lifting pin shaft and a lifting ear plate of a concrete precast column demoulding and turning auxiliary device of the present invention on a concrete precast column; Fig.12 This is a schematic diagram of the dimensions of a stiffening truss of a demoulding and flipping auxiliary device for a precast concrete column during simulation verification in Example 1 of the present invention; Fig.13 A schematic diagram of the SAP2000 and Abaqus models of a demoulding and flipping auxiliary device for a precast concrete column in a simulation verification according to the first embodiment of the present invention; Fig.14 This is a comparison diagram of the deformation results of the Z9 column during the simulation verification of a demoulding and flipping auxiliary device for a precast concrete column according to the first embodiment of the present invention; Fig.15 This is a diagram showing the calculation results of the Z9 column stress during the simulation verification of a demoulding and flipping auxiliary device for a precast concrete column according to the first embodiment of the present invention; Fig.16 This is a comparison diagram of the deformation results of the Z8 column during the simulation verification of a demoulding and flipping auxiliary device for a precast concrete column according to the first embodiment of the present invention; Fig.17 This is a diagram showing the calculation results of the Z7 column stress during the simulation verification of a demoulding and flipping auxiliary device for a precast concrete column according to the first embodiment of the present invention; Fig.18 The present invention is a schematic diagram of the steps of using a demoulding and flipping auxiliary device for a precast concrete column.

[0011] Description of labels: 1. Precast concrete column; 2. Flip lifting point; 3. Mounting frame; 4. First load-bearing arm; 5. Second load-bearing arm; 6. Contact assembly; 7. Lifting pin shaft; 8. Lifting ear plate; 9. Shaft hole; 10. Limit hole; 31. First stiffening truss; 32. Second stiffening truss; 33. Connector; 34. Lifting ring; 61. Mounting plate; 62. Embedded socket; 63. Connecting pin; 64. Filling plate. DETAILED DESCRIPTION

[0012] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0013] Please refer to Figures 1 to 11 , a demoulding and flipping auxiliary device for a precast concrete column, which is used to be installed on a load-bearing column, wherein the load-bearing column is a portion between the end of the precast concrete column 1 in a horizontal state farthest from a flipping hanging point 2 and the flipping hanging point 2, and comprises a mounting frame 3 and a first load-bearing arm 4 and a second load-bearing arm 5 which are arranged opposite to each other on the mounting frame 3; Both ends of the first force-bearing arm 4 and both ends of the second force-bearing arm 5 are provided with contact components 6; During installation, the first force-bearing arm 4 and the second force-bearing arm 5 are both parallel to the force-bearing column, and the first force-bearing arm 4 and the second force-bearing arm 5 are detachably arranged on the lower half surfaces of the two opposite side surfaces of the force-bearing column in the horizontal direction through their respective contact assemblies 6, and the lower half surfaces are the parts of the two opposite side surfaces of the force-bearing column in the horizontal direction that fall below the horizontal plane where the central axis of the force-bearing column is located.

[0014] From the above description, it can be seen that the beneficial effects of the present invention are: an auxiliary device for demoulding and flipping of a precast concrete column 1 is added, which consists of a mounting frame 3 and a first force-bearing arm 4 and a second force-bearing arm 5 arranged relatively on the mounting frame 3. The device as a whole adopts a leaping installation, and the first force-bearing arm 4 and the second force-bearing arm 5 are respectively connected to the two opposite sides of the force-bearing column of the precast concrete column 1 in the horizontal direction, while ensuring that the connection points of the first force-bearing arm 4, the second force-bearing arm 5 and the contact assembly 6 on the force-bearing column are all located below the horizontal plane where the central axis of the force-bearing column is located, so that when the precast concrete column 1 is demoulded and flipped, the first force-bearing arm 4 and the second force-bearing arm 5 can first replace the force-bearing column to bear part of the tensile stress generated during the flipping, so that the tensile stress on the precast concrete column 1 is significantly reduced, and the single hanging point operation is still used, while controlling the construction cost, effectively preventing the precast concrete column 1 with a high slenderness ratio from excessive deformation or cracking during demoulding and flipping.

[0015] Furthermore, the first force-bearing arm 4, the mounting frame 3 and the second force-bearing arm 5 form a mounting through slot for avoiding the force-bearing column; The width of the installation slot is adapted to the load-bearing column, and the distance between the contact assembly 6 and the bottom of the installation slot is greater than the distance between the central axis of the load-bearing column and the upper surface of the load-bearing column.

[0016] From the above description, it can be seen that through the installation groove composed of the first force-bearing arm 4, the mounting frame 3 and the second force-bearing arm 5, the device can be quickly positioned during installation, reducing the size of the gap between the first force-bearing arm 4 and the second force-bearing arm 5 and the force-bearing column, thereby improving the compactness of the overall installation connection of the device.

[0017] Furthermore, the mounting frame 3 includes a first stiffening truss 31, a second stiffening truss 32 and a connecting member 33; The first stiffening truss 31 and the second stiffening truss 32 are arranged opposite to each other, and the first stiffening truss 31 and the second stiffening truss 32 are connected by the connecting member 33; The first load-bearing arm 4 and the second load-bearing arm 5 are respectively located on the first stiffening truss 31 and the second stiffening truss 32 .

[0018] From the above description, it can be seen that the mounting frame 3 is composed of a first stiffening truss 31, a second stiffening truss 32 and a connecting member 33; the first stiffening truss 31 and the second stiffening truss 32 correspond to the first force-bearing arm 4 and the second force-bearing arm 5 respectively, which can not only reduce the weight of the device, but also ensure that the device has sufficient rigidity to effectively resist large tension or pressure.

[0019] Furthermore, there are at least two connecting members 33 , and all the connecting members 33 are distributed between the first stiffening truss 31 and the second stiffening truss 32 .

[0020] It can be seen from the above description that a plurality of connecting members 33 are provided between the first stiffening truss 31 and the second stiffening truss 32 to improve the overall stability and anti-deformation capability of the mounting frame 3 .

[0021] Furthermore, a lifting ring 34 is provided on the connecting member 33 .

[0022] From the above description, it can be seen that by providing a lifting ring 34 on the connecting member 33, the device can be used as a transition part for lifting, so that it can be used to transport the precast concrete column 1 in a horizontal state, thereby realizing the multifunctional and flexible application of the device.

[0023] Furthermore, the contact assembly 6 includes a mounting plate 61, a pre-embedded card seat 62 and a connecting pin 63; Both ends of the first force-bearing arm 4 and both ends of the second force-bearing arm 5 are provided with the mounting plates 61; The mounting plate 61 is provided with a limiting hole 10, and the embedded card seat 62 is used to be embedded in the stress-bearing column and corresponds to the opening on the stress-bearing column; One end of the connecting pin 63 can pass through the limiting hole 10 and the opening at the same time and be connected to the embedded socket 62 .

[0024] From the above description, it can be seen that at the connection point, the embedded socket 62 located in the force-bearing column cooperates with the connecting pin 63 on the mounting plate 61 to improve the stability of the connection; at the same time, it is convenient for rapid disassembly of the device after demoulding and flipping.

[0025] Furthermore, the contact assembly 6 also includes a filling plate 64; The filling plate 64 is provided with an avoidance groove corresponding to the limiting hole 10 , and the filling plate 64 is used to be inserted into the gap between the mounting plate 61 and the force-bearing column.

[0026] It can be seen from the above description that by adding the filling plate 64, the contact assembly 6 can be installed more tightly, avoiding the connection part from being offset along the axial direction of the connection pin 63, thereby improving stability.

[0027] Furthermore, it also includes a lifting pin shaft 7 and a lifting ear plate 8; The lifting lug plate 8 is provided with a connected shaft hole 9 and a limiting hole 10, and the diameter of the shaft hole 9 is larger than that of the limiting hole 10; The lifting ear plate 8 can be clamped and fixed on the lifting pin shaft 7 through the limiting hole 10, and the lifting pin shaft 7 is used to be installed on the flip lifting point 2.

[0028] From the above description, it can be seen that a lifting pin shaft 7 is added to the lifting part, and a lifting ear plate 8 is provided to facilitate the disassembly and assembly of the lifting pin shaft 7, so as to reduce the time spent in the two processes of hook installation and hook detachment before and after lifting of the precast concrete column 1, thereby improving the working efficiency.

[0029] Please refer to Fig.18 A method for using a demoulding and flipping auxiliary device for a precast concrete column is applied to the above-mentioned demoulding and flipping auxiliary device for a precast concrete column, comprising the following steps: S1, control the mounting frame 3 to align with the load-bearing column close to the precast concrete column 1, so that the first load-bearing arm 4 and the second load-bearing arm 5 respectively correspond to the lower halves of the two opposite side surfaces of the load-bearing column in the horizontal direction; S2, detachably fixing the first force-bearing arm 4 and the second force-bearing arm 5 to the lower half surface through the contact assembly 6, so that the mounting frame 3 is fixed on the force-bearing column; S3. After the precast concrete column 1 is demoulded and turned over, the connection of the contact assembly 6 is released, and the mounting frame 3 is removed from the load-bearing column.

[0030] From the above description, it can be seen that the beneficial effects of the present invention are: an auxiliary device for demoulding and flipping of a precast concrete column 1 is added, which consists of a mounting frame 3 and a first force-bearing arm 4 and a second force-bearing arm 5 arranged relatively on the mounting frame 3. The device as a whole adopts a leaping installation, and the first force-bearing arm 4 and the second force-bearing arm 5 are respectively connected to the two opposite sides of the force-bearing column of the precast concrete column 1 in the horizontal direction, while ensuring that the connection points of the first force-bearing arm 4, the second force-bearing arm 5 and the contact assembly 6 on the force-bearing column are all located below the horizontal plane where the central axis of the force-bearing column is located, so that when the precast concrete column 1 is demoulded and flipped, the first force-bearing arm 4 and the second force-bearing arm 5 can first replace the force-bearing column to bear part of the tensile stress generated during the flipping, so that the tensile stress on the precast concrete column 1 is significantly reduced, and the single hanging point operation is still used, while controlling the construction cost, effectively preventing the precast concrete column 1 with a high slenderness ratio from excessive deformation or cracking during demoulding and flipping.

[0031] Furthermore, before step S3, the following steps are also included: When the precast concrete column 1 is transported horizontally, the hook of the crane is connected to the lifting ring 34 on the mounting frame 3 by a lifting rope, and the precast concrete column 1 is lifted and transported by the mounting frame 3 .

[0032] From the above description, it can be seen that by providing a lifting ring 34 on the connecting member 33, the device can be used as a transition part for lifting, so that it can be used to transport the precast concrete column 1 in a horizontal state, thereby realizing the multifunctional and flexible application of the device.

[0033] Please refer to Figures 1 to 17 , Embodiment 1 of the present invention is: A demoulding and flipping auxiliary device for a precast concrete column is used to be installed on a load-bearing column, and the load-bearing column is the portion between the end of the precast concrete column 1 in a horizontal state that is farthest from the flipping hanging point 2 and the flipping hanging point 2, and is characterized in that it includes a mounting frame 3 and a first load-bearing arm 4 and a second load-bearing arm 5 that are relatively arranged on the mounting frame 3; both ends of the first load-bearing arm 4 and both ends of the second load-bearing arm 5 are provided with a contact assembly 6; During installation, combine Figures 1 to 3 As shown, the first force-bearing arm 4 and the second force-bearing arm 5 are parallel to the force-bearing column. The first force-bearing arm 4 and the second force-bearing arm 5 are detachably arranged on the lower half surfaces of the two opposite side surfaces of the force-bearing column in the horizontal direction through their respective contact assemblies 6. The lower half surfaces are the central axis of the force-bearing column falling into the two opposite side surfaces of the force-bearing column in the horizontal direction, that is, Figure 1The dotted line L in the figure is below the horizontal plane. As shown in the figure, the first force-bearing arm 4 and the second force-bearing arm 5 are respectively located on both sides of the force-bearing column of the precast concrete column 1, so that the device as a whole "straddles" the precast concrete column 1, while ensuring that the first force-bearing arm 4 and the second force-bearing arm 5 themselves and the connection position are all below the central axis of the force-bearing column of the precast concrete column 1; when the precast concrete column 1 is turned over, the first force-bearing arm 4 and the second force-bearing arm 5 bear the upper pulling force of the lifting and the gravity of the precast concrete column 1 to form tensile stress between the upper and lower surfaces of the precast concrete column 1, so as to reduce the tensile stress on the force-bearing column.

[0034] In this embodiment, if Figure 3 As shown, the first force-bearing arm 4, the mounting frame 3 and the second force-bearing arm 5 form a mounting slot for avoiding the force-bearing column; the width of the mounting slot is adapted to the force-bearing column, and the distance between the contact assembly 6 and the bottom of the mounting slot is greater than the distance between the central axis of the force-bearing column and the upper surface of the force-bearing column. Preferably, the mounting frame 3 includes a first stiffening truss 31, a second stiffening truss 32 and a connecting member 33; the first stiffening truss 31 and the second stiffening truss 32 are arranged opposite to each other, and the first stiffening truss 31 and the second stiffening truss 32 are connected by the connecting member 33; the first force-bearing arm 4 and the second force-bearing arm 5 are respectively located on the first stiffening truss 31 and the second stiffening truss 32. Optionally, there are at least two connecting members 33, and all the connecting members 33 are distributed between the first stiffening truss 31 and the second stiffening truss 32.

[0035] Combination Figure 1 It can be seen that the first stiffening truss 31 and the second stiffening truss 32 are both trapezoidal structures composed of four triangular units, and the bottom sides of the trapezoid serve as the first force-bearing arm 4 and the second force-bearing arm 5 respectively, and not only the two ends of the first force-bearing arm 4 and the two ends of the second force-bearing arm 5 have contact assemblies 6, but also the middle section of the first force-bearing arm 4 and the middle section of the second force-bearing arm 5 are provided with contact assemblies 6 at the positions where the corners of the corresponding different triangular units intersect; and, in order to be suitable for the demolding and flipping process of longer precast concrete columns 1, the first stiffening truss 31 and the second stiffening truss 32 can be composed of more triangular units and have a longer bottom side, that is, a longer first force-bearing arm 4 and second force-bearing arm 5.

[0036] like Figures 6 to 8As shown, the contact assembly 6 includes a mounting plate 61, a filling plate 64, an embedded card seat 62 and a connecting pin 63; the mounting plates 61 are provided on both ends of the first force-bearing arm 4 facing the side of the second force-bearing arm 5 and both ends of the second force-bearing arm 5 facing the side of the first force-bearing arm 4; the mounting plate 61 is provided with a limiting hole 10, and the embedded card seat 62 is used to be embedded in the force-bearing column and corresponds to the opening on the force-bearing column; one end of the connecting pin 63 can pass through the limiting hole 10 and the opening at the same time and connect with the embedded card seat 62; the filling plate 64 is provided with an avoidance groove corresponding to the limiting hole 10, and the filling plate 64 is used to insert into the gap between the mounting plate 61 and the force-bearing column. Among them, the embedded card seat 62 has a pin seat and vertical extensions arranged on both sides of the pin seat, and one end of the pin seat is provided with an opening for inserting the connecting pin 63.

[0037] like Figures 9 to 11 As shown, it also includes a lifting pin shaft 7 and a lifting ear plate 8; the lifting ear plate 8 is provided with a connected shaft hole 9 and a limiting hole 10, and the hole diameter of the shaft hole 9 is larger than the limiting hole 10; the lifting ear plate 8 can be clamped and fixed on the lifting pin shaft 7 through the limiting hole 10, and the lifting pin shaft 7 is used to be installed on the flip lifting point 2.

[0038] At the same time, the first force-bearing arm 4 and the second force-bearing arm 5 of the demoulding and flipping auxiliary device for the precast concrete column 1 of this embodiment can withstand part of the tensile stress of the precast concrete column 1 during the demoulding and flipping process to prevent the precast concrete column 1 from deforming or cracking. The simulation verification is as follows: First, the materials used for verification are described as follows: like Fig.12 As shown, the first stiffening truss 31 and the second stiffening truss 32 are both made of Q235 steel, with a steel section of square tube 120×120×6. The precast concrete column 1 is made of C40 concrete, the Z8 column section is 600×700, the length is 16.591m, and the Z9 column section is 600×800, the length is 17.347m. Holes are reserved in the column body, which are connected to the first force arm 4 and the second force arm 5 through three connecting pins 63 respectively. Then, the Z9 column section and the Z8 column section are verified and analyzed respectively: 1. Z9 column section Among them, the Z9 column section is 600X800 and the length is 17.347m. The flip hanging point 2 is set at a distance of 4.197m from the top of the column, and the hanging hole is located at the center axis of the column section. The total length of the stiffening truss is 9.6m, the height is 2.15m, there are 3 pins at the bottom (spacing 4.8m), the center of the pin hole is 81mm away from the bottom of the column, the lower chord of the truss is 32cm eccentric to the center axis of the column, and the rightmost end of the truss is 1.2m away from the bottom of the column; As shown in the figure, in order to verify the accuracy of the results, SAP2000 bar finite element and Abaqus solid finite element methods were used for modeling comparison. The cross-sectional dimensions, boundary conditions, and load conditions of the two groups of models are the same.

[0039] SAP2000 uses two-dimensional plane truss modeling, and the column bottom and hanging point are regarded as hinge supports. The truss rods are given a width of 2 times the cross section to approximately simulate the stiffness effect of the double-frame space truss. Considering the eccentricity between the truss as a whole and the center axis of the column, the truss position in the SAP2000 model is moved down as a whole, and a short connecting rod is set at the pin hole 9 to connect with the column. The connecting rod provides tension on the column to simulate the coordinated deformation of the truss and the column.

[0040] Therefore, combined with Fig.13 As shown in the figure, the deformation results of SAP2000 model and Abaqus model are analyzed, and it can be obtained that the maximum value of vertical deformation U2 of Z9 column calculated by SAP2000 is 2.9mm, which is slightly larger than that of Abaqus, indicating that the stiffness estimation of stiffening truss by SAP2000 is slightly too small.

[0041] Next, the bending moment Mx and shear force Vy of the SAP2000 model and Abaqus model are calculated, and Table 1 is obtained:

[0042] Table 1 Statistics of bending moment Mx and shear force Vy of Z9 SAP2000 model and Abaqus model It can be seen that the column internal force distribution results of SAP2000 and Abaqus are similar. The calculated value of the column span bending moment of SAP2000 with stiffening trusses is slightly larger than that of Abaqus, indicating that the stiffness estimation of the stiffening trusses by SAP2000 is slightly too small, and the conclusion is consistent with the above.

[0043] Based on this, the maximum bending moment M1k=152kN*m calculated by SAP2000 and Abaqus in Table 1 is selected to calculate the stress results of the concrete column: ; Among them, W1 represents the section resistance distance.

[0044] The stress of the entire Z8 column is calculated by finite element method using the above calculation method, and the results are as follows: Fig.14 As shown, it can be seen that considering the lifting dynamic coefficient of 1.5, the tensile stress on the upper and lower surfaces of the precast column Z9 is less than 2.3N / mm 2 , which is less than the standard value of tensile strength of C40 concrete (ftk=2.39N / mm 2), it will not crack when flipped. At the same time, the axial force of the member and the truss stress of the stiffening truss can be analyzed through the SAP2000 model and the Abaqus model to ensure that the stiffening truss of the current specification meets the design requirements.

[0045] 1. Z8 column section The Z8 column has a cross section of 600X700 and a length of 16.591m, which is about 1m shorter than the Z9 column. The hanging point and the placement of the stiffening truss are adjusted accordingly according to the internal force distribution. The hanging point is 3.891m away from the top of the column. The size and placement height of the stiffening truss are the same as those of the Z9, and the rightmost end of the truss is 1.15m away from the bottom of the column.

[0046] The Z8 column section also establishes SAP2000 model and Abaqus model to conduct internal stress analysis, such as Fig.15 As shown in the figure, it can be obtained that the maximum value of the vertical deformation U2 of the Z8 column calculated by SAP2000 is 2.7mm, which is slightly larger than that of Abaqus, indicating that the stiffness estimation of the stiffened truss by SAP2000 is slightly too small, which is consistent with the calculation conclusion of Z9. Then, the bending moment Mx and shear force Vy of the Z8 column section are calculated, and Table 2 is obtained:

[0047] Table 2 Statistics of bending moment Mx and shear force Vy of Z9 SAP2000 model and Abaqus model It can be seen that the column internal force distribution results of SAP2000 and Abaqus are similar. The calculated value of the column span bending moment of SAP2000 with stiffening trusses is slightly larger than that of Abaqus, indicating that the stiffness of the stiffening trusses estimated by SAP2000 is slightly too small, which is consistent with the calculation conclusion of Z9.

[0048] Based on this, the maximum bending moment M1k=114kN*m calculated by SAP2000 and Abaqus in Table 1 is selected to calculate the stress results of the concrete column: ; The above calculation method performs finite element calculation on the stress of the entire Z8 column, and the results are as follows Fig.16 As shown in the figure, it can be seen that considering the lifting dynamic coefficient of 1.5, the maximum tensile stress on the upper and lower surfaces of the precast column Z8 is less than 2.3N / mm 2 , which is less than the standard value of tensile strength of C40 concrete (ftk=2.39N / mm 2 ), it will not crack when flipped.

[0049] Please refer to Fig.18 , Embodiment 2 of the present invention is: A method for using a demoulding and flipping auxiliary device for a precast concrete column, which is applied to a demoulding and flipping auxiliary device for a precast concrete column in Embodiment 1, comprises the following steps: S1, control the mounting frame 3 to align with the load-bearing column close to the precast concrete column 1, so that the first load-bearing arm 4 and the second load-bearing arm 5 respectively correspond to the lower halves of the two opposite side surfaces of the load-bearing column in the horizontal direction; S2, detachably fix the first force-bearing arm 4 and the second force-bearing arm 5 to the lower half surface through the contact assembly 6, so that the mounting frame 3 is fixed on the force-bearing column; In this embodiment, the demoulding and flipping auxiliary device for the precast concrete column 1 can not only be used for the demoulding and flipping of the precast concrete column 1, but also can be used to lift and transport the precast concrete column 1 through the mounting frame 3 by connecting the hook of the crane with the lifting ring 34 on the mounting frame 3 through a lifting rope when horizontally transporting the precast concrete column 1.

[0050] When the precast concrete column 1 is demoulded and flipped, as shown in the figure, a flipping lifting point 2 can be opened on both sides of the precast concrete column 1 corresponding to the first force arm 4 and the second force arm, and then the lifting pin shaft 7 is connected to the flipping lifting point 2 through the lifting ear plate 8, and the lifting ear plate 8 is connected to the lifting rope of the crane.

[0051] S3. After the precast concrete column 1 is demoulded and turned over, the connection of the contact assembly 6 is released and the mounting frame 3 is removed from the load-bearing column.

[0052] In summary, the present invention provides a demoulding and flipping auxiliary device for precast concrete columns and a method of using the same, which comprises a mounting frame and a first force-bearing arm and a second force-bearing arm relatively arranged on the mounting frame, which are specifically connected via a connecting pin of a contact assembly; the device as a whole adopts a leaping installation, and the first force-bearing arm and the second force-bearing arm are respectively connected to two opposite side surfaces of the force-bearing column of the precast concrete column in the horizontal direction, while ensuring that the first force-bearing arm and the second force-bearing arm are both located below the horizontal plane where the central axis of the force-bearing column is located, so that when the precast concrete column is demoulded and flipped, the first force-bearing arm and the second force-bearing arm can first replace the force-bearing column to bear part of the tensile stress generated during flipping, so that the tensile stress on the precast concrete column is significantly reduced, and a single lifting point is still used for operation, while controlling the construction cost, effectively preventing the precast concrete column with a high slenderness ratio from excessive deformation or cracking during demoulding and flipping, and at the same time, additional lifting pins and lifting ear plates are provided to improve the operation efficiency.

[0053] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A demoulding and flipping auxiliary device for a precast concrete column, which is used to be installed on a load-bearing column, wherein the load-bearing column is the portion between the end of the precast concrete column farthest from the flipping hanging point in a horizontal state and the flipping hanging point, characterized in that: It comprises a mounting frame and a first force-bearing arm and a second force-bearing arm which are arranged opposite to each other on the mounting frame; Both ends of the first force-bearing arm and both ends of the second force-bearing arm are provided with contact components; During installation, the first force-bearing arm and the second force-bearing arm are both parallel to the force-bearing column, and the first force-bearing arm and the second force-bearing arm are detachably arranged on the lower half surfaces of the two opposite side surfaces of the force-bearing column in the horizontal direction through their respective contact assemblies, and the lower half surfaces are the parts of the two opposite side surfaces of the force-bearing column in the horizontal direction that fall below the horizontal plane where the central axis of the force-bearing column is located.

2. The demoulding and turning auxiliary device for precast concrete columns according to claim 1 is characterized in that: The first force-bearing arm, the mounting frame and the second force-bearing arm form a mounting slot for avoiding the force-bearing column; The width of the installation slot is adapted to the stress-bearing column, and the distance between the contact assembly and the bottom of the installation slot is greater than the distance between the central axis of the stress-bearing column and the upper surface of the stress-bearing column.

3. The demoulding and turning auxiliary device for precast concrete columns according to claim 1 is characterized in that: The mounting frame includes a first stiffening truss, a second stiffening truss and a connecting member; The first stiffening truss and the second stiffening truss are arranged opposite to each other, and the first stiffening truss and the second stiffening truss are connected via the connecting member; The first load-bearing arm and the second load-bearing arm are respectively located on the first stiffening truss and the second stiffening truss.

4. The demoulding and turning auxiliary device for precast concrete columns according to claim 3 is characterized in that: There are at least two connecting members, and all of the connecting members are distributed between the first stiffening truss and the second stiffening truss.

5. The demoulding and turning auxiliary device for precast concrete columns according to claim 3 is characterized in that: A lifting ring is provided on the connecting piece.

6. The demoulding and turning auxiliary device for precast concrete columns according to claim 1 is characterized in that: The contact assembly includes a mounting plate, a pre-embedded card seat and a connecting pin; Both ends of the first force-bearing arm and both ends of the second force-bearing arm are provided with the mounting plates; The mounting plate is provided with a limiting hole, and the embedded card seat is used to be embedded in the stress-bearing column and corresponds to the opening on the stress-bearing column; One end of the connecting pin can pass through the limiting hole and the opening at the same time and be connected to the embedded socket.

7. The demoulding and turning auxiliary device for precast concrete columns according to claim 6 is characterized in that: The contact assembly also includes a filler plate; The filling plate is provided with an avoidance groove corresponding to the limiting hole, and the filling plate is used to be inserted into the gap between the mounting plate and the force-bearing column.

8. The demoulding and turning auxiliary device for precast concrete columns according to claim 1 is characterized in that: Also includes a lifting pin shaft and a lifting lug plate; The lifting lug plate is provided with a connected shaft hole and a limit hole, and the diameter of the shaft hole is larger than that of the limit hole; The lifting ear plate can be clamped and fixed on the lifting pin shaft through the limiting hole, and the lifting pin shaft is used to be installed on the flip lifting point.

9. A method for using a demoulding and turning auxiliary device for a precast concrete column, applied to a demoulding and turning auxiliary device for a precast concrete column as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, controlling the mounting frame to align with the load-bearing column close to the precast concrete column, so that the first load-bearing arm and the second load-bearing arm respectively correspond to the lower halves of the two opposite side surfaces of the load-bearing column in the horizontal direction; S2. Removably fixing the first force-bearing arm and the second force-bearing arm to the lower half surface through a contact assembly, so that the mounting frame is fixed on the force-bearing column; S3. After the precast concrete column is demoulded and turned over, the connection of the contact assembly is released and the mounting bracket is removed from the load-bearing column.

10. The method for using the demoulding and turning auxiliary device for precast concrete columns according to claim 9, characterized in that: Before step S3, the following steps are also included: When the precast concrete column is transported horizontally, the hook of the crane is connected to the lifting ring on the mounting frame by a lifting rope, and the precast concrete column is lifted and transported by the mounting frame.

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