A device and construction method for catenary prestressed roof steel strand installation and linear control

Abstract

The application provides a device and a construction method for catenary prestressed roof steel strand installation and linear control, the device for steel strand installation and linear control comprises a device main round rod frame for installing a plurality of main columns, the main columns are installed on the main square frame, main threaded holes are formed in four corners of the main square frame, an adjustable control device telescopic boom is threadedly connected in each main threaded hole, lower ends of the adjustable control device telescopic booms are respectively connected to four corners of a steel strand supporting device, the steel strand is placed on the steel strand supporting device and is fixed through a wire; adjustable control device pull rods are also clamped on the device main round rod frame, and the other ends of the adjustable control device pull rods are buckled on longitudinal steel bars, transverse steel bars or stirrups. The application can guarantee the accuracy of the installation height point and position of the steel strand, guarantee the stability and reliability of the overall linear shape of the steel strand, and solve the displacement and linear shape change problem of the steel strand under the catenary form under the gravity of a large height difference.

Description

Technical Field

[0001] This invention belongs to the field of prestressed construction technology, and in particular relates to a device and construction method for installing and controlling the alignment of steel strands in catenary prestressed roofs. Background Technology

[0002] As the number of domestic public buildings and infrastructure projects gradually decreases, the shapes and structures of newly started projects are gradually shifting towards higher standards and specializations. Large cantilever, large span, and catenary structures are gradually increasing, and the use of supporting prestressed technology is also increasing. However, the problem of deformation of the steel strands of curved roofs with large height differences at both ends under the influence of height difference and gravity still exists, especially for catenary roof structures.

[0003] The height difference between the two ends of the prestressing tendons in the X direction of the catenary hollow slab is about 14.25m, and the length of a single tendon is about 44m. Due to the height difference of the steel strands and the influence of gravity, the shape of the tendons is prone to change and is difficult to maintain. At the same time, the positioning and binding of the prestressing tendons requires a lot of steel reinforcement supports, which conflicts with the binding of the existing floor slab reinforcement. This makes construction difficult and increases construction costs.

[0004] To address the aforementioned problems, this invention presents a device and construction method for the installation and alignment control of steel strands in catenary prestressed roofs. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device and construction method for the installation and alignment control of catenary prestressed roof steel strands, effectively solving the problems of difficulty in maintaining alignment, high construction difficulty, and high cost during the installation of catenary prestressed roof steel strands.

[0006] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0007] A device for installing and controlling the alignment of steel strands in a catenary prestressed roof includes a main cylindrical frame, with multiple main columns connected to the bottom of the main cylindrical frame. All main columns are mounted on a main square frame, and threaded holes are provided at the four corners of the main square frame. The main square frame is threadedly connected to four adjustable control device telescopic rods, the lower part of which is connected to a steel strand support device. The strands are installed in the steel strand support device and secured with binding wire. An adjustable control device tie rod is snapped onto the main cylindrical frame, and the other end of the tie rod is snapped onto the reinforcing steel of the catenary prestressed roof.

[0008] Furthermore, the main body round rod frame, main body column, and main body square frame of the device are integrally die-cast from steel.

[0009] Furthermore, the adjustable control device pull rod is a structure made of steel rod with hooks at both ends. The lower hook is snapped onto the main body of the device and can slide freely, while the upper end is snapped onto the reinforcing steel of the catenary prestressed roof.

[0010] Furthermore, the adjustable control device telescopic boom includes a threaded end, a smooth end, a tail end seal, and a tail end buckle. The threaded end of the telescopic boom is spirally inserted into the threaded hole of the main body and the insertion length can be adjusted by rotation. A protrusion is provided at the lower part of the smooth end of the telescopic boom, and a circular and freely rotatable tail end seal is fitted on the protrusion. A tail end buckle is welded below the tail end seal, and the tail end buckle is engaged in the four corner holes of the steel strand support device.

[0011] Furthermore, the steel strand support device is made of steel coils with holes at the four corners and has an arc-shaped structure.

[0012] A construction method for installing and controlling the alignment of prestressed steel strands in a catenary prestressed roof using a device for the installation and alignment control of the strands includes the following steps:

[0013] S1: Installation and construction of catenary prestressed roof formwork and support;

[0014] S2: After the catenary prestressed roof formwork and support are inspected and accepted, the longitudinal reinforcement, transverse reinforcement and stirrups are installed in sequence.

[0015] S3: Detail the prestressed professional drawings, calculate the sag of the steel strands according to the detailed content, and mark the positions of the formwork and reinforcing bars;

[0016] S4: Assemble the installation and alignment control device for the steel strands of the catenary prestressed roof. Use the adjustable control device telescopic rod to connect the steel strand support device and the main frame, and fasten the bottom of the adjustable control device rod to the main round rod frame of the device.

[0017] S5: Based on the staking elevation point position, select a suitable position to fasten the upper part of the adjustable control device tie rod to the corresponding steel bar, make a rough adjustment of the overall device, and make an initial elevation re-measurement of the steel strand support device.

[0018] S6: Rotary adjustable control device for telescopic boom, adjusts the length of its insertion into the main body threaded hole to accurately position the steel strand support device, and determines its elevation and position through equipment and instruments;

[0019] S7: Make the anchoring end of the steel strand and thread it through the bundle. Place the steel strand on the adjustable control device and tie it with tie wire. Check the shape and position of the steel strand again.

[0020] S8: Concrete pouring, vibration and curing;

[0021] S9: After the concrete reaches its design strength, prestressing tensioning and anchor sealing construction shall be carried out;

[0022] S10: Complete construction and dismantle formwork and supports.

[0023] The present invention has the following beneficial effects:

[0024] This invention can ensure the accuracy of the installation elevation and position of the steel strands and the firm binding of the steel strands through the adjustment of the adjustable control device, thus ensuring the stability and reliability of the overall shape of the steel strands. It solves the problems of steel strand displacement and shape change caused by gravity under extreme elevation differences in the catenary form. At the same time, it can be used and fixed quickly and conveniently, effectively solving the problem of poor quality of subsequent tensioning construction caused by steel strand deformation and displacement, thereby improving the overall construction quality of the roof panel. Attached Figure Description

[0025] Figure 1 This is a rendering of the catenary prestressed roof structure described in this invention;

[0026] Figure 2 This is an installation effect diagram of the steel strand installation and line shape control device described in this invention;

[0027] Figure 3 This is a structural diagram of the steel strand installation and line shape control device described in this invention;

[0028] Figure 4 This is a structural diagram of the adjustable control device described in this invention;

[0029] Figure 5 This is a detailed structural diagram of the telescopic boom of the adjustable control device described in this invention;

[0030] Figure 6 This is a flowchart illustrating the construction process of installing and controlling the alignment of the catenary prestressed roof steel strands described in this invention.

[0031] In the diagram, 1. Longitudinal reinforcement; 2. Steel strand; 3. Adjustable control device; 301 Adjustable control device main body; 3011 Main body round rod frame; 3012 Main body threaded hole; 3013 Main body column; 3014 Main body square frame; 302 Adjustable control device tie rod; 303 Adjustable control device telescopic rod; 3031 Telescopic rod threaded end; 3032 Telescopic rod smooth end; 3033 Telescopic rod tail end seal; 3034 Telescopic rod tail end buckle; 304 Steel strand support device; 4. Concrete; 5. Transverse reinforcement; 6. Stirrups; 7. Tie wire. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0033] like Figures 1 to 5 As shown, the device for installing and controlling the alignment of steel strands in a catenary prestressed roof according to the present invention includes longitudinal reinforcing bars 1, adjustable control device 3, concrete 4, transverse reinforcing bars 5, and stirrups 6.

[0034] like Figure 2 , 3 As shown, the adjustable control device 3 includes an adjustable control device body 301, an adjustable control device pull rod 302, an adjustable control device telescopic rod 303, and a steel strand support device 304.

[0035] like Figure 2 , 3 As shown in Figure 4, the main body 301 of the adjustable control device includes a main body round rod frame 3011, a main body column 3013, and a main body square frame 3014. The main body round rod frame 3011 is connected to the main body square frame 3014 through multiple main body columns 3013, and the three are integrally die-cast from steel. The main body square frame 3014 has main body threaded holes 3012 at each of its four corners for installing the adjustable control device telescopic rod 303. The adjustable control device telescopic rod 303 is screwed into the main body threaded hole 3012 by rotating the thread. By adjusting the screwing length of the adjustable control device telescopic rod 303, the elevation and position of the hanging steel strand support device 304 can be adjusted.

[0036] like Figure 2 , 3 As shown in Figure 4, the adjustable control device pull rod 302 is a structure with hooks at both ends made of steel rod. The lower hook of the adjustable control device pull rod 302 is snapped onto the main body round rod frame 3011 of the device and can slide freely. The upper end is snapped onto the longitudinal steel bar 1, the transverse steel bar 5 or the stirrup 6 to realize the rough elevation and position correction of the device.

[0037] like Figure 2 , 3As shown in Figures 4 and 5, the adjustable control device telescopic boom 303 includes a threaded end 3031, a smooth end 3032, a tail end seal 3033, and a tail end buckle 3034. The threaded end 3031 of the telescopic boom is threaded and can be inserted into the threaded hole 3012 of the main body. The insertion length can be adjusted by rotation. The lower part of the smooth end 3032 of the telescopic boom has a ring of protrusions. A ring-shaped telescopic boom tail end seal 3033 is fitted on the protrusion. The telescopic boom tail end seal 3033 can rotate freely. Below the telescopic boom tail end seal 3033, a telescopic boom tail end buckle 3034 is welded. The telescopic boom tail end buckle 3034 is engaged in the four corner holes of the steel strand support device 304, realizing the connection between the adjustable control device telescopic boom 303 and the steel strand support device 304. The telescopic boom tail end seal 3033 can restrict and prevent disengagement, but can rotate inside.

[0038] like Figure 2 , 3 As shown, the steel strand support device 304 is made of steel coils with holes at the four corners. It has an arc-shaped structure, which can stably support the placement of the steel strand 2. The steel strand 2 and the steel strand support device 304 are tied and fixed together by tie wire 7, so that the steel strand 2 will not slip due to its own weight under the action of a large height difference.

[0039] The construction method using the above-mentioned device for the installation and alignment control of steel strands in catenary prestressed roofs is as follows: Figure 6 As shown, the specific process includes the following:

[0040] S1: Installation and construction of catenary prestressed roof formwork and support;

[0041] S2: After the catenary prestressed roof formwork and support are inspected and accepted, the longitudinal reinforcement 1, the transverse reinforcement 5 and the stirrups 6 are installed in sequence.

[0042] S3: Detail the prestressed professional drawings, calculate the sag points of the steel strands according to the detailed content, and mark the positions of the formwork and reinforcing bars;

[0043] S4: Assemble the adjustable control device 3, use the adjustable control device telescopic rod 303 to connect the steel strand support device 304 and the main frame 3014, and fasten the bottom of the adjustable control device pull rod 302 onto the main frame 3011 of the device.

[0044] S5: Based on the staking elevation point position, select a suitable position to fasten the upper part of the adjustable control device tie rod 302 onto the corresponding reinforcing bar (longitudinal reinforcing bar 1 or transverse reinforcing bar 5 or stirrup 6), make a rough adjustment of the overall device, and conduct the initial elevation re-measurement of the steel strand support device 304.

[0045] S6: Rotary adjustable control device telescopic rod 303, adjusts its length into the main body threaded hole 3012 to accurately position the steel strand support device 304, and determines its elevation and position through equipment and instruments;

[0046] S7: Make the anchoring end of the steel strand and thread it through the bundle. Place the steel strand 2 on the adjustable control device 3 and tie it with tie wire 7. Check the shape and position of the steel strand 2 again.

[0047] S8: Concrete 4: Pouring, vibration and curing;

[0048] S9: After concrete 4 reaches its design strength, prestressing tensioning and anchor sealing construction shall be carried out;

[0049] S10: Complete construction and dismantle formwork and supports.

[0050] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A device for installing and controlling the alignment of steel strands in catenary prestressed roofing, characterized in that, The system includes longitudinal reinforcing bars (1), an adjustable control device (3), concrete (4), transverse reinforcing bars (5), and stirrups (6). The adjustable control device (3) includes an adjustable control device body (301), an adjustable control device tie rod (302), an adjustable control device telescopic rod (303), and a steel strand support device (304). The adjustable control device body (301) includes a device body round rod frame (3011), a main column (3013), and a main square frame (3014). Multiple main columns (3013) are connected below the device body round rod frame (3011), and the main columns (3013) are all installed on the main body. On the frame (3014), the main frame (3014) is provided with main threaded holes (3012) at the four corners; the main frame (3014) is threadedly connected to four adjustable control device telescopic rods (303), and the lower part of the adjustable control device telescopic rods (303) is connected to the steel strand support device (304); the steel strand (2) is installed in the steel strand support device (304) and tied and fixed by tie wire (7); the adjustable control device pull rod (302) is snapped on the main round rod frame (3011) of the device, and the other end of the adjustable control device pull rod (302) is snapped on the steel bar of the catenary prestressed roof; The adjustable control device pull rod (302) is a structure with hooks at both ends made of steel rod. The lower hook is snapped onto the main body round rod frame (3011) of the device and can slide freely. The upper end is snapped onto the steel bar of the catenary prestressed roof. The adjustable control device telescopic boom (303) includes a telescopic boom threaded end (3031), a telescopic boom smooth end (3032), a telescopic boom tail end seal (3033), and a telescopic boom tail end buckle (3034). The telescopic boom threaded end (3031) is spirally inserted into the main body threaded hole (3012) and the insertion length is adjusted by rotation. A ring of protrusion is provided at the lower part of the telescopic boom smooth end (3032), and a ring-shaped telescopic boom tail end seal (3033) that can rotate freely is fitted on the protrusion. A telescopic boom tail end buckle (3034) is welded below the telescopic boom tail end seal (3033), and the telescopic boom tail end buckle (3034) is snapped into the four corner holes of the steel strand support device (304). The steel strand support device (304) is made of steel coils with holes at the four corners and has an arc-shaped structure.

2. The device for installation and alignment control of catenary prestressed roof steel strands according to claim 1, characterized in that, The main body round rod frame (3011), main body column (3013), and main body square frame (3014) of the device are integrally die-cast from steel.

3. A construction method for installing and controlling the alignment of prestressed steel strands in a catenary prestressed roof using the device for installation and alignment control of catenary prestressed roof steel strands as described in claim 1, characterized in that, The process includes the following: S1: Installation and construction of catenary prestressed roof formwork and support; S2: After the catenary prestressed roof formwork and support are inspected and accepted, the longitudinal reinforcement (1), transverse reinforcement (5) and stirrups (6) are installed in sequence. S3: Detail the prestressed professional drawings, calculate the sag of the steel strand (2) according to the detailed content, and mark the template and reinforcement positions; S4: Assemble the installation and alignment control device for the steel strand of the catenary prestressed roof. Use the adjustable control device telescopic rod (303) to connect the steel strand support device (304) and the main frame (3014), and fasten the bottom of the adjustable control device pull rod (302) onto the main round rod frame (3011) of the device. S5: Based on the staking elevation point position, fasten the upper part of the adjustable control device rod (302) onto the corresponding reinforcing bar, make a rough adjustment of the overall device, and make the initial elevation re-measurement of the steel strand support device (304); S6: The telescopic boom (303) of the rotary adjustable control device is adjusted to adjust its length into the threaded hole (3012) of the main body to accurately position the steel strand support device (304), and its elevation and position are determined by the equipment and instruments; S7: Make the anchor end of the steel strand and thread it through. Place the steel strand (2) on the adjustable control device (3) and tie it with tie wire (7). Check the shape and position of the steel strand (2) again. S8: Concrete (4) is poured, vibrated and cured; S9: After the concrete (4) reaches the design strength, prestressing tensioning and anchor sealing construction shall be carried out; S10: Complete construction and dismantle formwork and supports.

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