Cast steel cylindrical built-in cable clamp for space structure

Abstract

The invention provides a cast steel cylindrical built-in cable clamp for a space structure, and belongs to the field of building construction. According to the technical scheme, the device comprises an annular structure steel pipe, a plurality of cylindrical clamps are arranged in the annular structure steel pipe, and through cable holes are formed in the cylindrical clamps; a plurality of mounting grooves are formed in the pipe wall of the annular structure steel pipe along the design position of the prestressed steel cable, and arc-shaped plugging plates are arranged at openings of the mounting grooves; positioning holes are formed in the pipe wall of the steel pipe of the annular structure and the arc-shaped plugging plate, and the prestressed steel cable penetrates through the positioning holes and the cable holes; the cylindrical built-in cable clamp comprises a pair of semi-cylindrical clamps which are arranged along the inner wall of the annular structure steel pipe in an arc-shaped matching mode. The method has the beneficial effects that the cast steel cylindrical cable clamp is arranged in the annular structure steel pipe, precise guiding and reliable anchoring of the prestressed steel cable are achieved, the node exposure volume is remarkably reduced, the linear control precision, the construction efficiency and the durability of the space structure are improved, and the building modeling integrity is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of building construction, and more particularly to a cast steel column-shaped built-in cable clamp for spatial structures. Background Technology

[0002] With the widespread application of new building structure forms such as large-span spatial structures and cable-supported spatial spiral structures, prestressed steel cables are often used together with members such as ring steel beams and curved beams to form an integrated load-bearing system. Spatial stiffness and overall stability are achieved by guiding, tensioning, and anchoring multiple prestressed steel cables at ring nodes. However, to ensure the visual effect of "lightness, transparency, and integrity" in the building space, the node anchoring structure not only needs to meet mechanical performance and construction convenience, but also needs to minimize the interference of exposed components on the building's shape.

[0003] In current engineering practice, spatial cable-supported structure nodes mostly adopt the following types of approaches: Firstly, exposed cable clamps, anchor plates, or anchor boxes are welded to the outside of the ring steel beam, and the prestressed steel cables are clamped by bolts, pressure plates, and other components. Secondly, integral cast steel nodes or welded column nodes are used, and anchors or anchoring clamps are installed on the outer surface of the nodes; Third, the steel cable is passed through the ring beam, and additional brackets, end anchors and other components are added on the outside for tensioning and locking; While these approaches are relatively mature in terms of stress and construction, they generally suffer from problems such as large node volume, numerous exposed components, and bulky shapes, which can easily disrupt the original lightness and continuity of the spatial structure.

[0004] Furthermore, exposed cable clamps are mostly located on the outer surface of the ring beam or outside the nodes. The position and angle of incidence of the steel cables are often limited by the shape of the node and the construction space. The control of the cable alignment depends on on-site adjustments, making it difficult to precisely match the designed spatial geometry. Exposed clamps often require extensive welding and secondary grinding to connect with the ring beam, making the construction process cumbersome. Exposed welds and bolt holes are prone to corrosion and lack long-term durability. At complex nodes where multiple steel cables are anchored together, the existing node structure also suffers from problems such as component interference, insufficient installation space, and limited tensioning sequence, increasing construction difficulty and project costs. Summary of the Invention

[0005] The purpose of this invention is to provide a cast steel column-shaped built-in cable clamp for spatial structures, which achieves precise guidance and reliable anchoring of prestressed steel cables by embedding cast steel column-shaped cable clamps into the annular structural steel pipe, significantly reduces the exposed volume of nodes, improves the accuracy of spatial structure alignment control, construction efficiency and durability, and ensures the integrity of the building shape.

[0006] This invention is achieved through the following measures: A cast steel cylindrical internal cable clamp for a space structure is characterized by comprising an annular structural steel pipe, wherein a plurality of cylindrical clamps are arranged inside the annular structural steel pipe along the designed position of the prestressed steel cable, and the cylindrical clamps are provided with through cable holes. The annular steel pipe has several installation grooves along the design position of the prestressed steel cable on its pipe wall, and an arc-shaped sealing plate is provided at the opening of the installation groove. The arc-shaped sealing plate is welded to the annular structural steel pipe. At the same time, the periphery of the arc-shaped sealing plate and the groove of the installation slot are provided with matching positioning flanges or stepped edges to achieve precise alignment with the outer wall of the annular structural steel pipe when the arc-shaped sealing plate is welded and sealed. The arc-shaped sealing plate matches the groove shape of the mounting groove. A first semi-circular groove and a second semi-circular groove are respectively opened on the pipe wall of the annular structural steel pipe and the arc-shaped sealing plate. The first semi-circular groove and the second semi-circular groove are combined in the sealing state to form a positioning hole for restricting the prestressed steel cable from passing through. The prestressed steel cable passes through the positioning hole and the cable hole. The cylindrical built-in cable clamp includes a pair of semi-cylindrical clamps that are arc-shapedly fitted along the inner wall of the annular structural steel pipe.

[0007] The invention also has the following specific features: The first semi-cylindrical clamp of the pair of semi-cylindrical clamps is fixed to the inner wall of the annular steel pipe by welding, and the second semi-cylindrical clamp is detachably connected to the first semi-cylindrical clamp by a number of limiting bolts.

[0008] A semi-circular through groove is provided on the splicing surface of the first semi-cylindrical clamp and the second semi-cylindrical clamp. After the two semi-cylindrical clamps are joined together, a cable hole is formed corresponding to the position of the positioning hole.

[0009] The semi-circular through-slot is opened along the spatial position and incident angle of the prestressed steel cable.

[0010] The first and second semi-cylindrical clamps are provided with a plurality of symmetrically arranged threaded mounting holes. Limit bolts are provided in the corresponding threaded mounting holes of the first and second semi-cylindrical clamps to reliably connect the first and second semi-cylindrical clamps and clamp the prestressed steel cable.

[0011] The threaded mounting holes are symmetrically arranged along the center lines of the first and second semi-cylindrical clamps to ensure uniform force distribution on the cylindrical clamps.

[0012] The arc-shaped sealing plate has bolt through holes at the positions corresponding to the limiting bolts.

[0013] The bolt through-hole is used to provide an installation and operation channel for the limiting bolt after the arc-shaped sealing plate is welded; preferably, the bolt through-hole is sealed and treated with anti-corrosion by a sealing plug, weld plug layer or sealing cover plate after the limiting bolt is tightened. At the same time, the weld between the arc-shaped sealing plate and the annular structural steel pipe is sealed and treated with anti-corrosion to ensure the continuity and integrity of the outer surface of the annular structural steel pipe and improve its durability.

[0014] The first and second semi-cylindrical clamps are integrally formed from cast steel, and the outer arc contours of the first and second semi-cylindrical clamps match the inner arc of the annular steel pipe.

[0015] At the same time, space is reserved between the inner and outer contours for tensioning operations and bolt installation.

[0016] The splicing surfaces of the first and second semi-cylindrical clamps are complementary planes or toothed surfaces with positioning bosses and positioning grooves. Meanwhile, the semi-cylindrical clamps are provided with toothed clamping surfaces, radial grooves, or anti-slip indentations along the circumference of the cable hole to increase the friction between the clamp and the prestressed steel cable and improve the reliability of clamping and anchoring.

[0017] A method for tensioning and anchoring prestressed steel cables in a spatial structure using a cast steel cylindrical internal cable clamp, characterized by the following steps: S1. Designing the number and position of the installation groove, arc-shaped sealing plate, cable holes, and positioning holes based on the spatial relationship and incident angle between the prestressed steel cable and the annular structural steel pipe in the spatial structure; S2. Processing the installation groove on the wall of the annular structural steel pipe in the factory, simultaneously cutting an arc-shaped sealing plate matching the shape of the installation groove, processing semi-circular slots for the prestressed steel cable to pass through on the annular structural steel pipe and the arc-shaped sealing plate, and welding and fixing the first semi-cylindrical clamp to the inner wall of the annular structural steel pipe; S3. Assembling the second semi-cylindrical clamp. S4. The prestressed steel cable is sequentially passed through the corresponding positioning hole and cable hole on the first semi-cylindrical clamp, and then pre-tensioned according to the predetermined sequence and working conditions to establish the cable net geometry; S5. When the prestressed steel cable tension reaches the design tension range, the limiting bolt is tightened so that the prestressed steel cable is clamped and anchored by a pair of semi-cylindrical clamps. Then the weld and bolt through hole of the arc-shaped sealing plate and the annular steel pipe are sealed and anti-corrosion treated to complete the final forming of the node.

[0018] The beneficial effects of this invention are as follows: By embedding the cast steel columnar cable clamp into the annular structural steel pipe, this invention achieves precise guidance and reliable anchoring of the prestressed steel cable, significantly reduces the exposed volume of the nodes, improves the accuracy of spatial structure alignment control, construction efficiency and durability, and ensures the integrity of the building's shape. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the ring structure and prestressed steel cable in Embodiments 1 and 2 of the present invention.

[0020] Figure 2 This is a schematic diagram of the spherical clamp inside the annular steel pipe in Embodiments 1 and 2 of the present invention.

[0021] Figure 3 This is a schematic diagram of the spherical clamp in Embodiments 1 and 2 of the present invention.

[0022] Figure 4 This is a schematic diagram of the structure of the second semi-cylindrical clamp in Embodiments 1 and 2 of the present invention. The attached figures are labeled as follows: 1. Annular steel pipe; 101. Mounting groove; 2. Prestressed steel cable; 3. Arc-shaped sealing plate; 301. Bolt through hole; 4. First semi-cylindrical clamp; 5. Second semi-cylindrical clamp; 6. Limiting bolt; 7. Semi-circular through groove; 8. Threaded mounting hole. Detailed Implementation

[0023] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to describe the solution.

[0024] Example 1 See Figure 1-4 A cast steel cylindrical internal cable clamp for a space structure includes an annular structural steel pipe 1, and several cylindrical clamps are arranged inside the annular structural steel pipe 1 along the designed position of the prestressed steel cable 2. The cylindrical clamps are provided with through cable holes. Several installation grooves 101 are provided on the pipe wall of the annular steel pipe 1 along the designed position of the prestressed steel cable 2, and an arc-shaped sealing plate 3 is provided at the opening of the installation groove 101. The arc-shaped sealing plate 3 is welded to the annular structural steel pipe 1. At the same time, the periphery of the arc-shaped sealing plate 3 and the groove of the installation groove 101 are provided with matching positioning flanges or stepped edges to achieve precise alignment with the outer wall of the annular structural steel pipe 1 when the arc-shaped sealing plate 3 is welded and sealed. The arc-shaped sealing plate 3 matches the groove shape of the mounting groove 101. A first semi-circular groove and a second semi-circular groove are respectively opened on the pipe wall of the annular steel pipe 1 and the arc-shaped sealing plate 3. The first semi-circular groove and the second semi-circular groove are combined in the sealing state to form a positioning hole for restricting the prestressed steel cable 2 from passing through. The prestressed steel cable 2 passes through the positioning hole and the cable hole. The cylindrical built-in cable clamp includes a pair of semi-cylindrical clamps that are arc-shapedly fitted along the inner wall of the annular structural steel pipe 1.

[0025] The first semi-cylindrical clamp 4 of the pair of semi-cylindrical clamps is fixed to the inner wall of the annular steel pipe 1 by welding, and the second semi-cylindrical clamp 5 is detachably connected to the first semi-cylindrical clamp 4 by several limiting bolts 6.

[0026] A semi-circular through groove 7 is provided on the splicing surface of the first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5. After the two semi-cylindrical clamps are joined together, a cable hole corresponding to the position of the positioning hole is formed.

[0027] The semi-circular through groove 7 is opened along the spatial position and incident angle of the prestressed steel cable 2.

[0028] The first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 are provided with a number of symmetrically arranged threaded mounting holes 8. Limit bolts 6 are provided in the corresponding threaded mounting holes 8 of the first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 to reliably connect the first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 and clamp the prestressed steel cable 2.

[0029] Several threaded mounting holes 8 are symmetrically arranged along the center lines of the first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 to ensure that the cylindrical clamps are subjected to uniform force.

[0030] A bolt through hole 301 is provided on the arc-shaped sealing plate 3 at the position corresponding to the limit bolt 6.

[0031] The bolt through hole 301 is used to provide an installation and operation channel for the limiting bolt 6 after the arc-shaped sealing plate 3 is welded; preferably, after the limiting bolt 6 is tightened, the bolt through hole 301 is sealed and treated with anti-corrosion by a sealing plug, weld plug layer or sealing cover plate, and at the same time, the weld between the arc-shaped sealing plate 3 and the annular structural steel pipe 1 is sealed and treated with anti-corrosion, so as to ensure the continuity and integrity of the outer surface of the annular structural steel pipe 1 and improve its durability.

[0032] The first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 are integrally formed from cast steel. The outer arc contours of the first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 match the inner arc of the annular steel pipe 1.

[0033] At the same time, space is reserved between the inner and outer contours for tensioning operations and bolt installation.

[0034] The splicing surfaces of the first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 are complementary planes or toothed surfaces with positioning bosses and positioning grooves. At the same time, the semi-cylindrical clamps are provided with toothed clamping surfaces, radial grooves or anti-slip indentations along the circumference of the cable hole to increase the friction between them and the prestressed steel cable 2 and improve the reliability of clamping and anchoring.

[0035] A method for tensioning and anchoring prestressed steel cables 2 in a spatial structure using a cast steel cylindrical internal cable clamp, characterized by the following steps: S1, designing the number and position of the installation groove 101, the arc-shaped sealing plate 3, cable holes, and positioning holes based on the spatial relationship and incident angle between the prestressed steel cable 2 and the annular structural steel pipe 1 in the spatial structure; S2, machining the installation groove 101 on the pipe wall of the annular structural steel pipe 1 in the factory, simultaneously cutting an arc-shaped sealing plate 3 that matches the shape of the installation groove 101, machining semi-circular slots for the prestressed steel cable 2 to pass through on the annular structural steel pipe 1 and the arc-shaped sealing plate 3, and welding and fixing the first semi-cylindrical clamp 4 to the inner wall of the annular structural steel pipe 1; S3, installing the second semi-cylindrical clamp 5... The cable is assembled onto the first semi-cylindrical clamp 4 and detachably connected to the first semi-cylindrical clamp 4 via the limiting bolt 6 to form a cable hole. Then, the arc-shaped sealing plate 3 is assembled into the installation groove 101 to complete the prefabrication of the node unit of the annular structure steel pipe 1. S4. During the installation of the spatial structure, the prestressed steel cable 2 is passed through the corresponding positioning hole and cable hole in sequence, and is initially tensioned according to the predetermined sequence and working conditions to establish the cable net geometry. S5. When the tension of the prestressed steel cable 2 reaches the design tension range, the limiting bolt 6 is tightened so that the prestressed steel cable 2 is clamped and anchored by a pair of semi-cylindrical clamps. Then, the weld between the arc-shaped sealing plate 3 and the annular structure steel pipe 1 and the bolt through hole 301 are sealed and treated with anti-corrosion to complete the final forming of the node.

[0036] Example 2 See Figure 1-4 The specific implementation of the present invention will be described in conjunction with engineering application scenarios. It should be understood that the following embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention. In the “Spring” spatial structure project in the atrium of a museum, a spiral-rising spatial force system is formed by using a ring-shaped steel pipe 1 and multiple prestressed steel cables 2. For the ring beam anchorage end of each prestressed steel cable 2, the cast steel column-shaped built-in cable clamp of the present invention is used. Specifically, the annular structure steel pipe 1 adopts a circular cross-section steel pipe component. During pre-processing, an installation groove 101 is cut out along the circumferential direction at the designed anchorage position of the prestressed steel cable 2. At the same time, an arc-shaped sealing plate 3 matching the size of the installation groove 101 is retained. The length and width of the installation groove 101 are determined according to the size of the column clamp and the construction operation space to ensure that the assembly requirements of the column clamp are met without significantly weakening the cross-sectional bearing capacity of the annular structure steel pipe 1. On the inner wall of the mounting groove 101 of the annular steel pipe 1, a first semi-cylindrical clamp 4 is welded and fixed. The outer arc contour of the first semi-cylindrical clamp 4 matches the inner arc of the annular steel pipe 1. The first semi-cylindrical clamp 4 and the second semi-cylindrical clamp 5 are cast steel parts, and the splicing surface is provided with complementary positioning bosses and positioning grooves to ensure that the semi-circular through groove 7 is precisely matched after assembly. After the two are joined together, a cable hole is formed through the cylindrical clamp.

[0037] On the wall of the annular structural steel pipe 1 and the arc-shaped sealing plate 3 at the opening of the installation groove 101, a first semi-circular groove and a second semi-circular groove are respectively machined so that after the arc-shaped sealing plate 3 is in place, a positioning hole is formed for the prestressed steel cable 2 to pass through. The axis of the positioning hole is kept coaxial with the axis of the cable hole inside the cylindrical clamp so that the prestressed steel cable 2 does not bend when it passes through.

[0038] During construction, the main ring structure is constructed first. Then, the prestressed steel cables 2 pass through the positioning holes and cable holes sequentially from the outside of the ring structure steel pipe 1. After all the internal cable clamp nodes are pre-installed, the prestressed steel cables 2 are initially tensioned according to the design requirements to eliminate the initial sag and installation errors of the cables and monitor the overall deformation of the spatial structure. Subsequently, the final tensioning is carried out according to the tension control stress or tension control elongation control method to make each prestressed steel cable 2 reach the design cable force. After the final tensioning is completed, the limiting bolts 6 are tightened through the bolt through holes 301 on the sealing plate to lock the prestressed steel cables 2 inside the columnar clamp, completing the anchoring of the cast steel columnar internal cable clamp. Finally, the tightening status of the limiting bolts 6 is checked. Then, the weld between the arc-shaped sealing plate 3 and the ring structure steel pipe 1 and the bolt through holes 301 are sealed and treated with anti-corrosion to ensure the continuity and integrity of the outer surface of the ring structure steel pipe 1 and improve its durability. At the same time, the appearance of the ring structure steel pipe 1 is restored to a continuous and complete circular cross-section component.

[0039] Through the above embodiments, the cast steel column-shaped built-in cable clamp of the present invention achieves complete internal integration of nodes and continuous and unified appearance while ensuring the structural safety of the space structure and the reliable anchoring of the prestressed steel cable 2. It is particularly suitable for spatial spiral cable structure projects with high requirements for architectural effect and node concealment.

[0040] The technical features of this invention not described can be implemented by or using existing technology, and will not be repeated here. Of course, the above description is not a limitation of this invention, and this invention is not limited to the examples above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this invention should also be within the protection scope of this invention.

Claims

1. A cast steel cylindrical internal cable clamp for a space structure, characterized in that, It includes a ring-shaped steel pipe, and several cylindrical clamps are set inside the ring-shaped steel pipe along the design position of the prestressed steel cable. The cylindrical clamps are provided with through holes for the cable. The annular steel pipe has several installation grooves along the design position of the prestressed steel cable on its pipe wall, and an arc-shaped sealing plate is provided at the opening of the installation groove. The arc-shaped sealing plate matches the groove shape of the mounting groove. A first semi-circular groove and a second semi-circular groove are respectively opened on the pipe wall of the annular structural steel pipe and the arc-shaped sealing plate. The first semi-circular groove and the second semi-circular groove are combined in the sealing state to form a positioning hole for restricting the prestressed steel cable from passing through. The prestressed steel cable passes through the positioning hole and the cable hole. The cylindrical built-in cable clamp includes a pair of semi-cylindrical clamps that are arc-shapedly fitted along the inner wall of the annular structural steel pipe.

2. The cast steel cylindrical internal cable clamp for space structures according to claim 1, characterized in that, The first semi-cylindrical clamp of the pair of semi-cylindrical clamps is fixed to the inner wall of the annular steel pipe by welding, and the second semi-cylindrical clamp is detachably connected to the first semi-cylindrical clamp by a number of limiting bolts.

3. The cast steel cylindrical internal cable clamp for space structures according to claim 1, characterized in that, A semi-circular through groove is provided on the splicing surface of the first semi-cylindrical clamp and the second semi-cylindrical clamp. After the two semi-cylindrical clamps are joined together, a cable hole is formed corresponding to the position of the positioning hole.

4. The cast steel cylindrical internal cable clamp for space structures according to claim 1, characterized in that, The first and second semi-cylindrical clamps are provided with a plurality of symmetrically arranged threaded mounting holes. Limit bolts are provided in the corresponding threaded mounting holes of the first and second semi-cylindrical clamps to reliably connect the first and second semi-cylindrical clamps and clamp the prestressed steel cable.

5. The cast steel cylindrical internal cable clamp for a space structure according to claim 1, characterized in that, The arc-shaped sealing plate has bolt through holes at the positions corresponding to the limiting bolts.

6. The cast steel cylindrical internal cable clamp for a space structure according to claim 1, characterized in that, The first and second semi-cylindrical clamps are integrally formed from cast steel, and the outer arc contours of the first and second semi-cylindrical clamps match the inner arc of the annular steel pipe.

7. A method for tensioning and anchoring prestressed steel cables in a spatial structure using a cast steel cylindrical built-in cable clamp as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Based on the spatial relationship and incident angle between the prestressed steel cables and the annular structural steel pipe in the spatial structure, design the quantity and position of the installation groove, arc-shaped sealing plate, cable holes, and positioning holes; S2. In the factory, process the installation groove on the wall of the annular structural steel pipe, and simultaneously cut an arc-shaped sealing plate matching the shape of the installation groove. Process semi-circular slots for the prestressed steel cables to pass through on the annular structural steel pipe and the arc-shaped sealing plate, and weld and fix the first semi-cylindrical clamp to the inner wall of the annular structural steel pipe; S3. Assemble the second semi-cylindrical clamp onto the first semi-cylindrical clamp, detachably connect it to the first semi-cylindrical clamp with a limiting bolt to form a cable hole, and then assemble the arc-shaped sealing plate at the installation groove to complete the prefabrication of the annular structural steel pipe node unit; S4. During the installation of the spatial structure, pass the prestressed steel cables sequentially through the corresponding positioning holes and cable holes, and perform preliminary tensioning according to a predetermined sequence and working condition requirements to establish the cable net geometry; S5. When the prestressed steel cable tension reaches the design tension range, tighten the limiting bolts so that the prestressed steel cable is clamped and anchored by a pair of semi-cylindrical clamps. Then, seal and protect the welds and bolt holes of the arc-shaped sealing plate and the annular structural steel pipe to complete the final forming of the node.

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