CN114526904B - Cable force test device of space cable structure - Google Patents

Abstract

The invention relates to a cable force test device for a space cable structure, comprising: a support, which is a vertical bearing member of the cable force test device; a grid platform supported by the support, and the grid platform is supported by grid rods and bolt balls Connected by high-strength bolts, the bolt ball includes the upper string ball and the lower string ball; the cable is arranged below the grid platform, and the two ends are connected with the lower string ball of the grid platform; the strut is arranged below the grid platform, and the lower ends are connected The upper end of the cable body is connected with the lower string ball of the grid platform; the tensioning tooling is arranged on the cable to tension the cable to generate prestress; the platform reinforcement device is arranged above the grid platform and is connected to the grid platform. The upper string ball connection of the grid platform; the platform displacement monitoring system is arranged on the grid platform. The invention can be used for the cable force test test of different cable structure forms, and has small requirements on the test site, strong adaptability, safety and convenience, simple structure replacement and strong economy, and is worthy of engineering promotion.

Description

A cable force test device for a space cable structure

technical field

The invention relates to the field of building structures, in particular to a test device for building structures, in particular to a cable force test device for a space cable structure.

Background technique

In recent years, with the rapid development of construction technology, cable structures have been widely used in modern construction projects and bridge construction projects. The application of prestressed cables can reduce the structure size, shorten the construction period, save materials, and have advantages such as economic advantages, which are widely used, especially in stadiums, exhibition halls, large-span coal shed construction, and large-span bridges.

The safety of the cable structure has also become very important, and the detection of the cable force is an important means to ensure its safety. In the engineering construction and the work of the cable after the construction is completed, the cable force detection of the prestressed cable is very important. Detecting the cable force can control the working status of the cable and the health status of the cable. Nowadays, there are many detection methods for cable force, such as pressure gauge measurement method, pressure sensor measurement method, frequency measurement method, magnetic effect method, etc.

The pressure gauge measurement method is also called the jack method. It detects the tension force by measuring the oil pressure when the steel cable is tensioned by a jack. This method has a high degree of difficulty in detection and requires high site requirements.

The pressure sensor measurement method is to directly install the tension sensor on the cable anchor or the anchor rod to measure the steel cable force. This method is not only wasteful, has a limited life, high cost, long time, and difficulty. The problem of inconsistent calibration status.

The frequency measurement method measures the natural vibration frequency of the steel cable, and uses the relationship between the natural vibration frequency and the cable force to measure the cable force. Due to the complexity of the relationship between the natural vibration frequency and the cable force, it takes a long time and requires high environmental requirements. The accuracy is low and there are limitations in application.

The magnetic effect method, based on the magnetic effect method to detect the cable force, also includes: (1) the magnetic flux measurement method, this method must install the sensor during construction and cannot be removed; (2) the inductance measurement method, this method The sensors and measuring instruments are more complicated, the process is too cumbersome, and the cost is relatively high, the precision control is insufficient, and the effect is average.

In addition, there are various forms of prestressed cable structures, such as string beam structure, cable net structure, string support dome structure, saddle-shaped cable net structure, etc. For different cable structures, the corresponding test main devices are required to be different. If cable monitoring is performed for each structure, too many test model devices are required, the required site is too large, the economic cost is too high, the test cycle is long, and the efficiency is high. Low.

Therefore, it is necessary to research a simple and practical universal test device to meet the requirements of cable force test of space cable structure.

SUMMARY OF THE INVENTION

In view of the deficiencies of the prior art, the main purpose of the present invention is to provide a cable force test device for a space cable structure to solve one or more problems in the prior art.

For achieving the above object, technical scheme of the present invention is as follows:

A cable force test device for a space cable structure, comprising:

The support, placed on the test ground, serves as the vertical bearing member of the cable force test device;

The grid platform is supported by the support, and the grid platform is composed of grid rods and bolt balls connected by high-strength bolts. The bolt balls include an upper string ball and a lower string ball, and the lower string ball has reserved threaded holes;

The cable is arranged below the grid platform, and the two ends are connected with the lower string ball of the grid platform;

The strut is arranged below the grid platform, the lower end is connected with the cable body, and the upper end is connected with the lower string ball of the grid platform;

Tensioning tooling, set on the cable, used to tension the cable to generate prestress;

The platform strengthening device is arranged above the grid platform and is connected with the upper string ball of the grid platform;

The platform displacement monitoring system, arranged on the grid platform, is used to measure the displacement change of the grid platform in the cable force test.

In some embodiments, the support is composed of an upper cross rib plate and a lower round steel pipe, wherein the upper end of the cross rib plate forms a concave shape and is welded with the lower string ball of the grid platform, and the lower end of the cross rib plate is fixed with the upper end of the steel pipe connect.

In some embodiments, a steel plate 1 is welded to the lower end of the cross-rib plate, a steel plate 2 is welded to the upper end of the round steel pipe, four high-strength bolts are pre-welded on the second steel plate, and bolt holes are formed on the first steel plate corresponding to the high-strength bolts, The two steel plates are connected by high-strength bolts.

In some embodiments, the cable is connected to the lower string ball through a lug plate, one end of the lug plate is threaded through the lug plate with a high-strength bolt, and the other end of the lug plate passes through the lug through a pin shaft The plate is connected with the cable head of the cable.

In some embodiments, the strut is a round steel pipe, the lower end of the round steel pipe is a cable clip node connected to the cable body, the upper end is welded with a sealing plate, the center of the sealing plate is opened, and the sealing plate and the round steel pipe are pre-installed in the round steel pipe before welding. High-strength bolts are placed, and the high-strength bolts pass through the central opening of the sealing plate and are threadedly connected to the lower string ball of the grid platform.

In some embodiments, a sleeve is added between the sealing plate and the lower string ball, the sleeve is sleeved outside the high-strength bolt, the sleeve is provided with a small screw hole, and the slot is milled corresponding to the position of the high-strength bolt. During installation, screw in the screw , the rotating sleeve drives the high-strength bolt to rotate.

In some embodiments, the tensioning tool is installed on the cable near the cable head, and includes two load-bearing U-shaped bars, two sets of load-bearing flat poles, a load-bearing frame, and two load-bearing rods in order from the cable head outward. straight bar and two sets of feedthrough jacks, and:

One end of the two load-bearing U-shaped rods hangs the cable head of the cable, and the other end passes through the corresponding load-bearing pole, and is locked with a nut;

The load-bearing frame is sleeved on the cable;

The two sets of piercing jacks are correspondingly sleeved on two load-bearing straight rods, and the piercing jacks are connected to the oil pump;

The two load-bearing straight rods pass through the load-bearing frame and the through-core jack, are connected and fixed with the load-bearing pole at one end of the load-bearing frame, and are locked with nuts at one end of the through-core jack.

In some embodiments, the platform reinforcement device is a bidirectional prestressed tension string structure, which is composed of a cable, a strut and a cross node. Arrangement, the intersection is connected by a cross node, one end of the strut is connected with the cross node, and the other end is connected with the upper string ball of the grid platform.

In some embodiments, the platform displacement monitoring system adopts an electronic positioning device or an electronic displacement meter, which is arranged at the upper string ball of the grid platform to monitor the displacement at the bolt ball node of the grid platform.

In some embodiments, the stay cables and braces are arranged below the grid platform to form a one-way tension beam structure, a two-way tension beam structure, a sling structure, a chord dome structure, a flat cable network structure or a saddle cable network structure.

The beneficial effects of the present invention relative to the prior art are as follows: the present invention provides a cable force test device for a space cable structure, which can be used to perform cable force test tests under different cable structures. Specifically, it has at least the following practical Effect:

(1) The test device adopts multiple supports to carry the grid platform, and the rubber pads are placed under the supports, which do not need to be anchored with the ground, and are suitable for different sites;

(2) The cables and struts are connected to the grid platform through high-strength bolts and lugs, which are easy to replace and facilitate quick and flexible adjustment of the cable structure and test objects;

(3) The grid platform may be deformed due to the test loading. The platform reinforcement device is arranged in the opposite direction to the test object to enhance the overall rigidity of the test platform, provide strength and support for the model test platform, and reduce the displacement of the platform during the test;

(4) The platform displacement monitoring system is used to measure the displacement change of the platform during the test, calibrate the test object and platform displacement data, and correct the test results;

(5) The tensioning tool is used to fasten the cable head, and the cable is tensioned to reach the preset prestress for cable force test, and the cable force of the cable is easy to control;

(6) The device has strong versatility, a single device can be used for cable structure test, and can simulate a variety of different types of cable structures according to requirements, such as one-way tension string beam structure, two-way tension string beam structure, sling structure, string support dome structure, plane Cable-net structure or saddle-shaped cable-net structure;

(7) The device has small requirements on the test site, strong adaptability, light weight, convenient transportation, and easy disassembly. The overall installation has low requirements on hydropower facilities and machinery, and is highly economical.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are required to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, other implementation drawings can also be obtained according to the extension of the drawings provided without creative efforts.

The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the contents disclosed in the specification, so as to be understood and read by those who are familiar with the technology, and are not used to limit the conditions for the implementation of the present invention, so there is no technical The substantive meaning above, any modification of the structure, the change of the proportional relationship or the adjustment of the size, without affecting the effect that the present invention can produce and the purpose that can be achieved, should still fall within the technical content disclosed in the present invention. In the range.

1 is a schematic diagram of the overall structural arrangement of an embodiment of the present invention;

2 is a schematic diagram of a grid node according to an embodiment of the present invention;

3 is a schematic diagram of a support structure according to an embodiment of the present invention;

4 is a schematic diagram of a cable node according to an embodiment of the present invention, wherein (a) is an overall side view, and (b) is a schematic diagram of the structure of the lug plate;

5 is a schematic diagram of a strut node according to an embodiment of the present invention;

6 is a schematic structural diagram of a platform enhancement device according to an embodiment of the present invention;

7 is a schematic side view of a tensioning tooling according to an embodiment of the present invention;

8 is a schematic top view of a tensioning tool according to an embodiment of the present invention;

9 is a schematic structural diagram of a one-way stretched string beam according to an embodiment of the present invention;

10 is a schematic structural diagram of a two-way stretched string beam according to an embodiment of the present invention;

11 is a schematic diagram of a sling structure according to an embodiment of the present invention;

12 is a schematic structural diagram of a chord dome according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a plane cable network structure according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a saddle-shaped cable net according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention will be described in further detail below with reference to the embodiments and the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but not to limit the present invention.

It is to be understood that the terms "comprising/comprising", "consisting of" or any other variation thereof are intended to encompass non-exclusive inclusion such that a product, device, process or method comprising a series of elements includes not only those elements , and may also include other elements, as required, not expressly listed, or inherent to such a product, apparatus, process or method. Without further limitation, an element defined by the phrases "comprising/comprising", "consisting of" does not preclude the presence of additional elements in the product, device, process or method comprising said element same elements.

It should also be understood that the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integration; it may be a mechanical The connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside" unless otherwise expressly specified and limited , "outside" and other indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device, component or structure referred to must have a specific The orientation, configuration or operation in a particular orientation, should not be construed as a limitation of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

The implementation of the present invention will be described in detail below with reference to the preferred embodiments.

1 shows a cable force test device for a space cable structure according to a preferred embodiment of the present invention, which mainly includes a support 1, a grid platform 2, a support rod 3, a cable 4, a tensioning tool 15, and a platform reinforcement device 13. The platform displacement monitoring system 14 is used for performing cable force testing experiments of space cable structures, especially for simulating various types of cable structures. The specific structure will be described in detail below with reference to the accompanying drawings.

In one embodiment, as shown in Figures 2-4, the grid platform 2 is composed of grid rods 21 and bolt balls 22. The grid rods 21 include an upper chord 21-1, a web 21-2, and a lower chord 21- 3. The bolt ball 22 includes an upper string ball 22-1 and a lower string ball 22-2. The grid rod 21 and the bolt ball 22 are connected by high-strength bolts 6. The grid platform 2 is supported by the supports 1 at least at both ends. Preferably, since the device is a test device, and different structural forms have different requirements for the position of nodes, the main grid of the grid platform 2 provided by the present invention is 1 meter, and part of the grid is 0.6 meters according to the structure of the grid itself. and 0.9 meters.

In one embodiment, referring to FIG. 1 and FIG. 3 , the support 1 is a cylindrical steel tube structure, which is placed on the test ground as a vertical bearing member of the cable force test device; preferably, a ground bearing is arranged below the support 1 The backing plate 5, the ground bearing backing plate 5 is placed on the test ground, and can be made of rubber material, and mainly bears the vertical load of the support 1 . The ground bearing pad is a rubber pad, which bears the weight of the upper component and has a certain protective effect on the ground, so that the support 1 does not need to be anchored with the ground, and is suitable for different sites, and the test of the present invention can be arranged in a room with a large space The installation and cable force test are carried out without damaging the indoor ground structure.

In one embodiment, continue to refer to FIG. 3 , the support 1 is composed of an upper cross rib plate 11 and a lower round steel pipe 12 , the upper end of the cross rib plate 11 is welded with the lower string ball of the grid platform 2 , preferably, the cross rib plate 11 can be welded The upper end of the rib plate 11 is formed into a semi-circular concave shape, which is welded with the lower string ball of the grid platform to realize the connection between the support 1 and the grid platform platform 2, and the semi-circular concave shape matches to accommodate the lower string ball, so that the cross-rib plate 11 can be perfectly matched with the bolt ball. Closely fit and welded to ensure the safe and reliable connection strength and stability of the support 1 and the grid platform 2, and prevent the joints from disengaging and the overall instability caused by the loading displacement during the test process.

The lower end of the cross rib plate 11 is fixedly connected with the upper end of the round steel pipe 12. Preferably, the present invention is connected by high-strength bolts 6, which is easy to disassemble, convenient for construction and installation, and simple to operate. More preferably, a steel plate 1 11-1 is welded to the lower end of the cross rib plate 11, a steel plate 2 12-1 is welded to the upper end of the round steel pipe 12, 4 high-strength bolts 6 are pre-welded on the steel plate 2 12-1, and the steel plate 1 11-1 is pre-welded. A high-strength bolt hole is provided on the upper part corresponding to the high-strength bolt 6 , and the two steel plates are connected by the high-strength bolt 6 . The high-strength bolts 6 are pre-buried at the upper end of the round steel pipe 12, and the nut only needs to be tightened on site, which is convenient for installation. At the same time, when needed, since the support is directly placed on the test ground, it is only necessary to unscrew the nut to easily replace the different heights. The round steel pipe 12 is used to meet various types of cable structures with different heights and different spans. Of course, the bolt balls welded with the cross rib plate 11 can also be unscrewed, and other forms of the grid platform 2 can be replaced to realize the flexible adjustment of the test device according to the test requirements. , and easy to disassemble.

In one embodiment, the cable 4 is made of high-strength steel bars, steel wires or steel strands, and both ends of the cable 4 are connected to the lower string ball 22-2 of the grid platform 2; preferably, see FIG. 4, the cable 4 is connected to the lower string 22-2. The ball 22-2 is connected by the lug plate 16, a hole is respectively opened at both ends of the lug plate 16, the corresponding lower string ball 22-2 is provided with a threaded hole, and one end of the lug plate 16 adopts a high-strength bolt 6 to pass through the hole and the lower string ball 22. -2 screw connection, the other end of the lug 16 is connected to the cable head 4-1 of the cable 4 through the pin shaft 7 through the hole.

In one embodiment, the ear plate 16 is a folded plate, and the included angle of the folded plate is determined according to the included angle between the cable 4 and the horizontal plane, so as to satisfy the installation of cable structures of different structural forms.

The pin is a type of standardized fastener, and the cable 4 and the ear plate 16 are hingedly connected through the pin 7 to allow the rotational displacement of the cable 4 at the nodes at both ends.

In one embodiment, the upper end of the strut 3 is connected to the lower string ball 22-2 of the grid platform 2, and the lower end is connected to the cable body. Preferably, as shown in Figure 5, the strut 3 is a round steel pipe, the lower end of the round steel pipe is a cable clamp node, the upper end is welded with a sealing plate 8, the sealing plate 8 is a square steel plate, the center of the sealing plate 8 is opened, and the sealing plate 8 and Before the round steel pipe is welded, high-strength bolts 6 are placed in the round steel pipe, and the high-strength bolts 6 pass through the central opening of the sealing plate 8 to connect with the lower chord ball of the grid platform 2 . By pre-embedding high-strength bolts 6 at the upper end of the round steel pipe, the corresponding lower chord balls 22-2 are provided with threaded holes, and the threaded connection facilitates the installation and disassembly of the struts 3 and the grid platform 2, because for cable structures of different types and spans, so The number and position of the struts will be different, and they need to be adjusted in a timely, fast and convenient manner.

In one embodiment, since the high-strength bolts 6 are pre-buried in the sealing plate 8 at the top end of the round steel pipe, tightening and loosening operations cannot be applied to them. In the present invention, a sleeve 9 is added between the sealing plate 8 and the lower string ball 22-2. , the sleeve 9 is set outside the high-strength bolt 6, the sleeve 9 is provided with a small screw hole with a diameter of 6mm, the hole needs to be tapped, and the groove is milled at the position corresponding to the high-strength bolt 6, and the screw 10 is passed through the screw hole on the sleeve 9 Embedded in the grooves of the high-strength bolts 6 , during installation and disassembly, the high-strength bolts 6 can be driven to rotate by simply twisting the sleeve 9 with a wrench, so as to achieve the purpose of tightening and loosening the high-strength bolts 6 .

In one embodiment, as shown in FIG. 7 and FIG. 8 , the tensioning tool 15 is installed on the cable near the cable head, and includes two load-bearing U-shaped rods 15- 1. Two sets of load-bearing poles 15-2, load-bearing frames 15-3, two load-bearing straight rods 15-4 and two sets of piercing jacks 15-5. Two load-bearing U-shaped rods 15-1 hang on the cable head 4-1 of the cable 4, and the other ends pass through the corresponding load-bearing poles 15-2 respectively, and are locked with nuts. The load-bearing poles 15-2 use Steel structure flat pole; the bearing frame 15-3 is set on the cable 4, and the bearing frame 15-3 preferably adopts a regular polygonal structure with a through hole for the cable; two sets of through-core jacks 15-5 The two load-bearing straight rods 15-4 are respectively sleeved on the outer side of the load-bearing frame 15-3, that is, the load-bearing frame 15-3 is located on the other side of the cable head 4-1, and the through-core jack 15-5 is connected oil pump (not shown). Two load-bearing straight rods 15-4 pass through the load-bearing frame 15-3 and the piercing jack 15-5, and are located at one end of the bearing frame 15-3 to be connected and fixed with the load-bearing flat pole 15-2, and are located at the piercing jack 15- One end of 5 is locked with a nut. After the cable head 4-1 is attached to the ear plate 16, the cable 4 is in a loose state, and the cable head 4-1 needs to be tightened. However, because the cable is heavy and the cable force is large, the cable head should be tightened manually. , the set cable force value cannot be reached, and the cable head cannot reach the working state. When tensioning, the piercing jack is connected to an oil pump, and the oil pump provides power. The piercing jack stands against the bearing frame, and the cylinder of the piercing jack extends to drive the cable head to move, and the cable is stretched to provide prestressing of the cable. Adjustable end fastening. By means of the specially designed tensioning tool of the present invention, the cable head can be easily tightened, and at the same time, the tensioning of the cable can be achieved to achieve a preset prestress, so as to carry out the cable force test.

Continue to refer to FIG. 1 , in the present invention, a platform strengthening device 13 is added above the grid platform 2 to be connected with the upper string ball of the grid platform 2 .

In one embodiment, the platform reinforcement device 13 is a bidirectional prestressed tension string structure, which is composed of a cable, a strut and a cross node. Both ends of the cable are connected to the upper string ball 22-1 of the grid platform 2. It is arranged staggered in the longitudinal direction, the intersection is connected by a cross node, one end of the strut is connected with the cross node, and the other end is connected with the upper string ball of the grid platform. The structure of an exemplary platform reinforcement device of the present invention is shown in FIG. 6 , and its structure is similar to the cable structure under the grid platform, especially the bidirectional tension string beam structure, as shown in FIG. 7 . By setting the platform reinforcement device above the grid platform, according to the structural mechanical properties of the string beam, the cable is pulled to provide pressure for the strut, the strut provides support for the grid platform, and the cable for the cable force test is located below the grid platform. Structure, the layout of the entire test device is reasonable, and the platform reinforcement device is arranged in the opposite direction to the test object, which enhances the overall rigidity of the test platform, provides strength and support for the model test platform, and reduces the displacement of the platform during the test.

In one embodiment, the present invention sets a platform displacement monitoring system 14 on the grid platform 2, and is arranged on the grid platform 2 to measure the displacement change of the grid platform during the test. During the cable force test of the cable structure, a large tensile force will be exerted by the hydraulic jack, causing the grid platform to produce microscopic displacements during the test, such as vertical or horizontal microscopic displacements. If this displacement is not corrected in the test results , which will affect the accuracy of the test results. In short, the purpose of the platform displacement monitoring system is to eliminate the measurement system error of the cable force test device. Integrate test object and platform displacement data to reduce error in test results.

Specifically, the platform displacement monitoring system 14 monitors the displacement at the bolt nodes connecting the grid platform 2, and places an electronic positioning device at the bolt ball 22 to be monitored (specifically, the lower chord ball 22-2), and moves through the coordinates of the electronic positioning device. Calculate displacement. Monitoring can also be performed using a multidirectional electronic displacement meter.

In the present invention, as shown in Figures 9-14, the test device is formed by connecting struts and cables at the lower part of the grid platform. The cables, struts and the grid platform are all connected by bolts. For different cable structures , only need to determine the length of the cable, the size of the cable lug plate, the length of the support rod, and by replacing the number and position of the support rod, the cable and the lug plate, the one-way tensioned beam structure, the two-way tensioned beam structure, the sling structure, and the string support dome structure are formed. , plane cable network structure or saddle-shaped cable network structure, the cable force test of different cable structure types can be realized. By simulating a variety of cable structure types, a single device can achieve the effect of multiple functions, which is economical, safe, accurate and convenient.

The invention has strong adaptability, and a single device can be used for cable force testing of different cable structure types, and can meet different space requirements and different ground requirements. The operation is simple and convenient, which greatly saves the cost and time.

Those skilled in the art can easily understand that, on the premise of no conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

Several illustrative embodiments have been described above, and it should be understood that various changes, modifications, and improvements will readily occur to those skilled in the art. Such alterations, modifications, and improvements are intended to form a part of this disclosure and are intended to be within the spirit and scope of the invention. Although some of the examples presented herein involve specific combinations of functions or structures, it should be understood that these functions and structures may be combined in other ways to achieve the same or different purposes in accordance with the present invention. In particular, acts, elements and features discussed in connection with one embodiment are not intended to be excluded from similar or other roles in other embodiments. Furthermore, the structures and components herein may be further divided into additional components or combined together to form fewer components for performing the same function. Accordingly, the foregoing description and drawings are by way of example only, and are not intended to be limiting, and the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (8)

1. The utility model provides a cable force test device of space cable structure which characterized in that includes:

the ground bearing base plate is arranged below the support and is arranged on the test ground to serve as a vertical bearing member of the cable force test device;

the net rack platform is supported by the support and is formed by connecting net rack rods and bolt balls through high-strength bolts, the bolt balls comprise upper chord balls and lower chord balls, and threaded holes are reserved in the lower chord balls;

the pull rope is arranged below the net rack platform, and two ends of the pull rope are connected with the lower chord ball of the net rack platform; the pull cable is connected with the lower chord ball through an ear plate, a hole at one end of the ear plate penetrates through the ear plate by adopting a high-strength bolt to be in threaded connection with the lower chord ball, and a hole at the other end of the ear plate penetrates through the ear plate by virtue of a pin shaft to be connected with a cable head of the pull cable;

the stay bar is arranged below the net rack platform, the lower end of the stay bar is connected with the stay cable body, and the upper end of the stay bar is connected with the lower chord ball of the net rack platform;

the tensioning tool is arranged on the inhaul cable and used for tensioning the inhaul cable to generate prestress;

the platform reinforcing device is arranged above the net rack platform and is connected with the upper chord ball of the net rack platform;

the platform displacement monitoring system is arranged on the net rack platform and used for measuring the displacement change of the net rack platform in the cable force test;

the guy cables and the stay bars are arranged below the net rack platform to form a one-way beam string structure, a two-way beam string structure, a sling structure, a string dome structure, a plane cable net structure or a saddle-shaped cable net structure.

2. The cable force test device according to claim 1, characterized in that:

the support is composed of an upper cross rib plate and a lower round steel pipe, wherein the upper end of the cross rib plate is concave and is welded with the lower chord ball of the net rack platform, and the lower end of the cross rib plate is fixedly connected with the upper end of the steel pipe.

3. The cable force test device of claim 2, wherein:

a first steel plate is welded at the lower end of the cross rib plate, a second steel plate is welded at the upper end of the circular steel tube, 4 high-strength bolts are welded on the second steel plate in advance, bolt holes are formed in the first steel plate in positions corresponding to the high-strength bolts, and the two steel plates are connected through the high-strength bolts.

4. The cable force test device of claim 1, wherein:

the vaulting pole is the circular steel tube, and the circular steel tube lower extreme is for cable clamp node and cable body coupling of cable, upper end welding shrouding, shrouding center trompil, places high strength bolt in the circular steel tube in advance before shrouding and the circular steel tube welding, high strength bolt wear out from the center trompil of shrouding with rack platform's lower chord ball threaded connection.

5. The cable force test device of claim 4, wherein:

a sleeve is additionally arranged between the sealing plate and the lower chord ball and sleeved outside the high-strength bolt, a small screw hole is formed in the sleeve and corresponds to the milling groove in the position of the high-strength bolt, and during installation, the screw is screwed in, and the sleeve is rotated to drive the high-strength bolt to rotate.

6. The cable force test device of claim 1, wherein:

stretch-draw frock installs and is close to cable head department on the cable, outwards includes two load U type stick, two sets of load shoulder pole, load frame, two straight stick of load and two sets of jack of wearing outward in proper order from the cable head to:

one end of each of the two force-bearing U-shaped rods is hung on the cable head of the inhaul cable, and the other end of each of the two force-bearing U-shaped rods penetrates through the corresponding force-bearing carrying pole and is locked by a nut;

the bearing frame is sleeved on the inhaul cable;

the two groups of through jacks are correspondingly sleeved on the two force-bearing straight rods, and the through jacks are connected with an oil pump;

the two force-bearing straight rods penetrate through the force-bearing frame and the through jack, one end of the force-bearing frame is fixedly connected with the force-bearing carrying pole, and one end of the through jack is locked by a nut.

7. The cable force test device of claim 1, wherein:

the platform reinforcing device is of a bidirectional prestress string-stretching structure and comprises a stay cable, stay rods and cross nodes, two ends of the stay cable are connected with the upper string ball of the net rack platform, the stay cable is transversely and longitudinally arranged in a staggered mode, the cross positions are connected through the cross nodes, one end of each stay rod is connected with the cross node, and the other end of each stay rod is connected with the upper string ball of the net rack platform.

8. The cable force test device of claim 1, wherein:

the platform displacement monitoring system adopts electronic positioning equipment or an electronic displacement meter, is arranged at the upper chord ball of the net rack platform and monitors the displacement at the bolt ball node of the net rack platform.

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