A test method for trestle railing

Abstract

The present invention discloses a trestle railing and a construction method thereof, comprising: a plurality of vertical poles, which are arranged at intervals on the outside of a concrete panel along the length direction of the trestle; a plurality of groups of U-shaped bolts, which are embedded in the concrete panel at intervals and correspond to the plurality of vertical poles one by one, any U-shaped bolt is arranged horizontally, and its arc-shaped end is located inside the concrete panel, and the bolt end passes through the concrete panel and the corresponding vertical pole in sequence and is fixed on the outside of the vertical pole; a plurality of horizontal bars, which are connected to the vertical poles through a connecting device. The present invention changes the welding connection between the vertical pole and the concrete panel into a pre-buried U-shaped bolt extrusion connection, thereby improving the bearing capacity level and reliability of the railing and facilitating construction. The present invention also provides a test method for a trestle railing, and the test process is simple and easy to operate, which provides a guarantee for the installation quality of the trestle railing in the same project.

Description

Technical Field

[0001] The present invention relates to the technical field of temporary bridge structure construction, and more specifically, to a trestle railing and a construction method and a test method thereof. Background Art

[0002] The bottom of the traditional trestle railing is mainly welded, which has the major disadvantage of easy desoldering. Moreover, the trestle railing is a temporary structure, the welding quality is not high, there are safety hazards, and safety accidents are prone to occur. In addition, with the rapid development of the foundation construction level, the trestle construction faces a more complex construction environment. The traditional railing is usually designed to be able to withstand a fixed horizontal external force within 1000N. When the construction environment and the construction project have higher requirements for the horizontal external force of the railing, the single-layer traditional railing cannot meet the construction requirements, and it is often necessary to increase the number of railings or replace the railing materials, which inevitably causes material waste and increased construction costs.

[0003] In order to solve the above problems, it is necessary to study a trestle railing that can improve the railing's ability to withstand horizontal external forces while ensuring the railing's stability during use and avoiding a waste of construction costs. Summary of the invention

[0004] The purpose of the present invention is to provide a trestle railing and a construction method thereof, which replaces the welding connection between the vertical pole and the concrete panel with a pre-buried U-bolt extrusion connection, thereby improving the bearing capacity level and reliability of the railing and facilitating construction. The present invention also provides a test method for the trestle railing, which uses a multi-point dynamic displacement detector to monitor the displacement of the target point after being stressed in real time. The test process is simple and easy to operate, which provides a guarantee for the installation quality of the trestle railing in the same project.

[0005] In order to achieve these purposes and other advantages according to the present invention, a trestle railing is provided, comprising:

[0006] A plurality of vertical poles are arranged at intervals on the outside of the concrete panel along the length direction of the trestle;

[0007] A plurality of groups of U-shaped bolts are embedded in the concrete panel at intervals and correspond to the plurality of vertical poles one by one. Each group of U-shaped bolts includes a plurality of U-shaped bolts arranged at intervals along the height direction of the corresponding vertical pole. Each U-shaped bolt is arranged horizontally, and its arc-shaped end is located inside the concrete panel. Two bolt ends pass through the concrete panel and the corresponding vertical pole in sequence and are fixed on the outside of the vertical pole.

[0008] A plurality of horizontal bars are arranged at intervals along the height direction of the vertical bars, and any horizontal bar is connected to the plurality of vertical bars one by one through a plurality of connecting devices.

[0009] Preferably, in the pier railing, the bolt ends of the U-bolts are respectively provided with connecting plates 1 and 2 along the length direction, wherein connecting plate 1 is located on the inner side of the vertical pole and is locked with the inner side wall of the vertical pole by a conical nut, and connecting plate 2 is located on the outer side of the vertical pole and is locked with the outer side wall of the vertical pole by a nut.

[0010] Preferably, the pier railing also includes a plurality of bases, which correspond one-to-one to the plurality of uprights, and any base is arranged on the outer side of the bottom of the corresponding upright and fixedly connected thereto, and the base is a hollow structure with openings at both ends, and the base is sleeved on the outer side of the U-bolt along the length direction of the U-bolt, and the height of the base is equal to the thickness of the concrete panel.

[0011] Preferably, the pier railing further includes a protection groove, which is a groove-shaped structure with an opening toward the upright poles. The protection groove is arranged on the top of the base along the length direction of the pier and forms a channel for pipelines to pass through with the plurality of upright poles.

[0012] Preferably, the trestle railing further comprises a skirting board, which is vertically arranged on the top of the concrete panel and is closely connected to the inner side walls of the plurality of uprights.

[0013] Preferably, any connecting device of the pier railing includes a sleeve, which is sleeved on the corresponding cross rail, and a bayonet is provided along the horizontal radial outer side of the sleeve; and a flagpole buckle, which passes through the outer side wall of the corresponding vertical pole and is engaged with the bayonet.

[0014] The present invention also provides a construction method for a trestle railing, comprising:

[0015] S1. Pre-embed the arc ends of a plurality of U-shaped bolts inside the concrete panel, install a conical nut and a connecting plate 1 on the bolt end of any U-shaped bolt, the conical nut is threadedly connected to the corresponding bolt end, and the connecting plate 1 is located outside the conical nut and penetrates the U-shaped bolt;

[0016] S2, installing multiple vertical poles, allowing the bolt ends of the U-bolts to pass through the bottoms of the corresponding vertical poles respectively, the inner side of any vertical pole abuts against the outer side of the concrete panel, and the conical nut is locked outward to press the connecting plate 1 against the inner side of the corresponding vertical pole;

[0017] S3, using a jack to tension the U-shaped bolt from the outside of the vertical pole, so that the U-shaped bolt is fixedly connected to the corresponding vertical pole;

[0018] S4, pouring concrete panels;

[0019] S5, installing a second connecting plate on the bolt end of the U-shaped bolt located outside the vertical pole, and fixing the second connecting plate on the outer side wall of the vertical pole by a nut;

[0020] S6, sequentially installing a base, a protection groove and a pipeline on the outer side of the vertical pole, and installing a plurality of horizontal bars on the plurality of vertical poles through a connecting device;

[0021] S7, after the concrete panel is solidified, a skirting board is installed between the concrete panel and the plurality of vertical poles, thereby completing the installation of the trestle railing.

[0022] The present invention also provides a test method for a trestle railing, comprising:

[0023] T1. Before pouring the concrete panel, a steel bar strain gauge in contact with the U-bolt is arranged at any position inside the concrete panel, and a concrete strain gauge is arranged between the U-bolt and the surface or bottom surface of the concrete panel;

[0024] T2. After the installation of the trestle railing is completed, the top of a vertical pole is selected as the target point, and a multi-point dynamic displacement detector is set on the ground outside the trestle railing so that its detection direction is facing the target point;

[0025] T3, installing and fixing a test bracket on the concrete panel inside the trestle railing, with the main frame of the test bracket close to the vertical pole, and hoisting a test sandbag on the main frame to face the target point;

[0026] T4, lifting the test sandbag inward at a set angle so that it hits the target point head-on after swinging freely, testing the root stress value of the vertical pole by the steel bar strain gauge and the concrete strain gauge, and testing the displacement at the target point by the multi-point dynamic displacement detector;

[0027] T5. Increase the weight of the test sandbag in stages, and repeat the contents of T4 until the set target bearing capacity is reached.

[0028] The present invention has at least the following beneficial effects:

[0029] 1. The present invention adopts a method of tensioning the U-bolts with a jack, so that the root of the vertical pole is wrapped and fixed by the extrusion force. Compared with the common welding connection method, the horizontal force bearing capacity of the vertical pole is greatly improved, and the stability of the trestle railing during use is effectively improved;

[0030] 2. The present invention uses a conical nut locking method to initially connect the U-bolt and the vertical pole. The conical nut has the advantages of good self-locking and easy installation, and can cooperate with the U-bolt to achieve a better connection effect without considering the slippage problem of the U-bolt caused by tensioning;

[0031] 3. The U-bolt in the present invention has the advantages of good connection dynamic performance, fatigue resistance, and easy crack expansion prevention, and can better adapt to the working environment with frequent horizontal impact and large impact force, and ensure the durability of the trestle railing;

[0032] 4. The present invention also provides a test device and a test method for the trestle railing. The stress at the root of the upright pole when the trestle railing is subjected to horizontal impact is collected through a strain gauge built into the concrete panel, and the displacement of the target point after being subjected to force is monitored in real time through a multi-point dynamic displacement detector, so as to quantify the simulated horizontal impact force and facilitate the control of the test force. The test process is simple and easy to operate, and can quickly test and determine whether the bearing capacity of the current trestle railing meets the standard.

[0033] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of the side elevation structure of a trestle railing according to an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the front elevation structure of the trestle railing described in the above embodiment;

[0036] Figure 3 This is a schematic diagram of the planar structure of the U-bolt connection described in the above embodiment;

[0037] Figure 4 It is a schematic diagram of the side elevation structure of the test device for the trestle railing described in the above embodiment;

[0038] Figure 5 It is a schematic diagram of the front elevation structure of the test device for the trestle railing described in the above embodiment;

[0039] Figure 6 Schematic diagram of the relationship between the weight of the test sandbag and the displacement of the target point in the above embodiment.

[0040] Description of reference numerals:

[0041] 1. Cover plate; 2. Vertical pole; 3. Flagpole buckle; 4. Pipeline; 5. Base; 6. Nut; 7. Connecting plate 1; 8. Conical nut; 9. Concrete panel; 10. U-bolt; 11. Skirting board; 12. Casing; 13. Crossbar; 14. Test sandbag; 15. Test bracket; 16. Concrete strain gauge; 17. Steel bar strain gauge; 18. Multi-point dynamic displacement detector; 19. Anchor device; 20. Target point; 21. Protection groove. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0043] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] like Figure 1-5 As shown, the present invention provides a trestle railing, comprising:

[0045] A plurality of upright poles 2 are arranged at intervals outside the concrete panel 9 along the length direction of the trestle;

[0046] A plurality of groups of U-shaped bolts 10 are embedded in the concrete panel 9 at intervals and correspond to the plurality of uprights 2 one by one. Any group of U-shaped bolts 10 includes a plurality of U-shaped bolts 10 arranged at intervals along the height direction of the corresponding upright 2. Any U-shaped bolt 10 is arranged horizontally, and its arc-shaped end is located inside the concrete panel 9. Two bolt ends pass through the concrete panel 9 and the corresponding upright 2 in sequence and are fixed on the outside of the upright 2.

[0047] A plurality of horizontal bars 13 are arranged at intervals along the height direction of the vertical bars 2 , and any horizontal bar 13 is connected to the plurality of vertical bars 2 one by one through a plurality of connecting devices.

[0048] In the above technical solution, the U-bolt 10 is a U-shaped friction type high-strength bolt, which has the advantages of good connection dynamic performance, fatigue resistance, and easy to prevent crack expansion. It can better adapt to the working environment with frequent horizontal impact and large impact force, and ensure the durability of the trestle railing. The arc end of the U-bolt 10 is embedded in the concrete panel 9, and the bolt end passes through the concrete panel 9 and the vertical pole 2, and is fixed on the outside of the vertical pole 2, thereby realizing a double compression connection on both sides of the vertical pole 2. On the one hand, the vertical pole is limited to prevent the vertical pole from shaking significantly during the force process, causing safety risks; on the other hand, the connection between the U-bolt 10 and the vertical pole 2 is reinforced from two opposite directions, which comprehensively improves the bearing level of the vertical pole under external impact force in the horizontal direction. For the same vertical pole 2, multiple U-bolts 10 can be set, which are arranged at intervals along the height direction of the vertical pole 2, and the bolt end of any U-bolt 10 faces outward and is arranged horizontally along the width direction of the trestle. In this embodiment, two upper and lower U-bolts 10 are arranged at intervals at the bottom of the same vertical pole 2. By increasing the number of U-bolts 10, the connection between the concrete panel 9 and the vertical pole 2 can be further strengthened to ensure its stability. In addition, a cover plate 1 is also provided on the top of the vertical pole 2 as the highest point of the overall trestle railing to prevent the railing from being bumped or damaged under the action of external forces.

[0049] In another technical solution, in the trestle railing, the bolt end of the U-bolt 10 is respectively sleeved with a connecting plate 1 7 and a connecting plate 2 along the length direction, the connecting plate 1 7 is located on the inner side of the upright 2 and is locked with the inner side wall of the upright 2 through a conical nut 8, and the connecting plate 2 is located on the outer side of the upright 2 and is locked with the outer side wall of the upright 2 through a nut 6. Among them, the conical nut 8 provided in conjunction with the U-bolt 10 has the advantages of good self-locking and convenient installation. After the connecting plate 1 7 is pressed by the conical nut 8 so that the upright 2 and the corresponding U-bolt 10 are initially fixed, the U-bolt 10 needs to be tensioned from the bolt end of the U-bolt 10. The characteristics of the conical nut 8 can ensure the reliability of the connection between the upright 2 and the U-bolt 10 during the tensioning process, and avoid the relative slippage of the U-bolt 10 during the tensioning process, resulting in loose connection, poor installation quality, and affecting the construction of subsequent processes. On the other side of the vertical pole 2, a connecting plate 2 and a conventional nut 6 are used to lock the part of the bolt end of the U-bolt 10 that passes through the vertical pole 2. This part of the connection structure needs to be carried out after the tensioning construction of the U-bolt 10 is completed to prevent the nut 6 from being offset or misplaced during the tensioning process, thereby ensuring a stable connection between the connecting plate 2 and the vertical pole 2. It can cooperate with the connecting plate 1 7 to press the bottom of the vertical pole 2 from both sides and limit it, thereby improving the connection stability between the vertical pole and the concrete panel (inner U-bolt).

[0050] In another technical solution, the trestle railing further includes a plurality of bases 5, which correspond to the plurality of uprights 2 one by one. Any base 5 is arranged on the outside of the bottom of the corresponding upright 2 and fixedly connected thereto. The base 5 is a hollow structure with openings at both ends. The base 5 is sleeved on the outside of the U-bolt 10 along the length direction of the U-bolt 10. The height of the base 5 is equal to the thickness of the concrete panel 9. Specifically, the base 5 includes two sections of channel steels symmetrically spliced ​​together. One end of any channel steel is fixed to the outside of the bottom of the upright 2, and the other end extends outward along the length direction of the U-bolt 10. The open groove of the channel steel is arranged opposite to the U-bolt 10. After the two sections of channel steel are spliced ​​together, a hollow structure with openings at both ends is formed around the U-bolt 10. The length of the channel steel is greater than the length of the U-bolt 10 passing through the outside of the upright 2, which can protect the exposed bolt end of the U-bolt 10 and increase the prestressing tensioning construction space for easy construction. The base 5 is arranged on the outside of the bottom of the vertical pole 2, which increases the contact area between the vertical pole 2 and the bridge deck without affecting the U-bolt. The bottom surface of the base 5 is flush with the bottom surface of the concrete panel 9, and the top surface of the base 5 is flush with the top surface of the concrete panel 9, which shares the impact force of the vertical pole when it is subjected to an outward horizontal impact, which is beneficial to improving the overall stability of the trestle railing.

[0051] In another technical solution, the trestle railing further includes a protection groove 21, which is a groove-shaped structure with an opening toward the upright pole 2. The protection groove 21 is arranged at the top of the base 5 along the length direction of the trestle and forms a channel for the pipeline 4 to pass through with the plurality of upright poles 2. In this embodiment, the trestle railing is an integral standardized pipeline 4 railing, and a channel for the installation of the pipeline 4 is reserved on the outside of the upright pole 2. Therefore, a protection groove 21 is arranged on the top of the base 5, which is a channel steel structure and supported on the top of the plurality of bases 5. The protection groove 21 is located at the outer end of the base 5. The outer side wall of the protection groove 21 and the upright pole 2 forms a side edge for limiting the left and right positions of the pipeline 4, and the top surface of the base 5 forms a bottom edge for supporting the pipeline 4. In addition, the width of the protection groove 21 (the length of the part overlapping with the base 5 along the length direction of the base 5) is less than the length of the base 5, which is convenient for laying and installing pipelines from the outside.

[0052] In another technical solution, the trestle railing further includes a skirting board 11, which is vertically arranged on the top of the concrete panel 9 and is closely connected to the inner side walls of the plurality of uprights 2. Thus, the plurality of uprights 2 are connected as a whole at the connection between the concrete panel 9 and the uprights 2, further strengthening the connection stability between the bottom of the uprights and the concrete panel, and improving the overall bearing capacity of the trestle railing.

[0053] In another technical solution, any connection device of the trestle railing includes a sleeve 12, which is sleeved on the corresponding horizontal rail 13, and a bayonet is provided along the horizontal radial outer side of the sleeve 12; and a flagpole buckle 3, which passes through the outer side wall of the corresponding vertical pole 2 and is engaged with the bayonet. The sleeve 12 is sleeved at the connection node between the corresponding horizontal rail 13 and the vertical pole 2. When installing the horizontal rail 13, the horizontal rail 13 and the sleeve 12 both pass through the installation hole reserved on the vertical pole 2. A through hole is also provided at the position corresponding to the bayonet of the sleeve 12 on the vertical pole 2. The flagpole buckle 3 is passed through the through hole and buckled into the bayonet of the corresponding sleeve 12 to fix the connection node, so that the horizontal rail 13 is fixedly connected to the vertical pole 2. This connection method has a simple structure, is easy to construct, and is convenient for maintenance and disassembly during the subsequent construction process.

[0054] The present invention also provides a construction method for a trestle railing, comprising:

[0055] S1. Pre-embed the arc ends of multiple U-shaped bolts 10 inside the concrete panel 9, install a conical nut 8 and a connecting plate 7 on the bolt end of any U-shaped bolt 10, the conical nut 8 is threadedly connected to the corresponding bolt end, and the connecting plate 7 is located outside the conical nut 8 and penetrates the U-shaped bolt 10;

[0056] S2, install multiple vertical poles 2, make the bolt ends of the U-bolts 10 pass through the bottom of the corresponding vertical poles 2 respectively, make the inner side of any vertical pole 2 abut against the outer side of the concrete panel 9, lock the conical nut 8 outward, make the connecting plate 7 and the inner side of the corresponding vertical pole 2 pressed tightly, and preliminarily fix the vertical pole 2 and the corresponding U-bolt 10;

[0057] S3, using a jack to tension the U-shaped bolt 10 from the outside of the vertical pole 2, so that the U-shaped bolt 10 is fixedly connected to the corresponding vertical pole 2;

[0058] A method of tensioning the U-bolt 10 with a jack causes the U-bolt 10 to deform to a certain extent after tensioning, so that the root of the upright 2 is wrapped and fixed by the extrusion force. Compared with the ordinary welding connection method, the horizontal force bearing capacity of the upright 2 is greatly improved, and the stability of the trestle railing during use is effectively improved.

[0059] S4, pouring concrete panel 9;

[0060] After the tensioning is completed, the concrete panel 9 is cast as a whole. Previously, what is connected to the U-bolts 10 is the steel bar structure inside the concrete panel 9, which is convenient for the installation of the previous connecting plate 7 and the tapered nuts 8 and the tensioning construction of the U-bolts 10 from the inside of the panel. After the tensioning is completed, the concrete panel 9 is cast as a whole, so that the part of the U-bolts 10 located inside the concrete panel 9, the tapered nuts 8, the connecting plate 7 and the concrete panel 9 are formed as one piece, thereby strengthening the connection stability of this part of the structure, and it is not easy to shake or deform when the trestle railing is subjected to external impact force.

[0061] S5, installing a second connecting plate on the bolt end of the U-bolt 10 located outside the vertical pole 2, and fixing the second connecting plate on the outer side wall of the vertical pole 2 by means of a nut 6;

[0062] S6, sequentially install the base 5, the protection groove 21 and the pipeline 4 on the outer side of the vertical pole 2, and install the plurality of horizontal bars 13 on the plurality of vertical poles 2 through the connecting device;

[0063] S7, after the concrete panel 9 is solidified, the skirting board 11 is installed between the concrete panel 9 and the plurality of uprights 2, thus completing the installation of the trestle railing.

[0064] The present invention also provides a test method for a trestle railing, comprising:

[0065] T1. Before pouring the concrete panel 9, a steel bar strain gauge 17 in contact with the U-bolt 10 is provided at any position inside the concrete panel 9, and a concrete strain gauge 16 is provided between the U-bolt 10 and the surface or bottom surface of the concrete panel 9;

[0066] In this embodiment, two upper and lower U-shaped bolts 10 are correspondingly provided at the bottom of the same vertical pole 2, and two concrete strain gauges 16 are correspondingly provided, the upper concrete strain gauge 16 is arranged between the upper U-shaped bolt 10 and the surface of the concrete panel 9, and the lower concrete strain gauge 16 is arranged between the lower U-shaped bolt 10 and the bottom surface of the concrete panel 9. The steel bar strain gauge 17 and the concrete strain gauge 16 are connected to the external pipeline 4 through wires to transmit the stress parameters read by the strain gauge to the external display.

[0067] T2, after the installation of the trestle railing is completed, the top of a vertical pole 2 is selected as the target point 20, and a multi-point dynamic displacement detector 18 is set on the ground outside the trestle railing so that its detection direction is facing the target point 20;

[0068] T3, installing and fixing a test bracket 15 on the concrete panel 9 on the inner side of the trestle railing, the main frame of the test bracket 15 is close to the upright pole 2 and is vertically arranged, and a test sandbag 14 is hoisted on the main frame and made to face the target point 20, wherein the test bracket 15 is installed on the concrete panel 9 by an anchoring device 19 for easy disassembly and assembly; the weight of the test sandbag is determined according to the set horizontal bearing capacity test range of the trestle railing;

[0069] T4, lift the test sandbag 14 inward at a set angle, so that it hits the target point 20 head-on after free swing, test the root stress value of the vertical pole 2 by the steel bar strain gauge 17 and the concrete strain gauge 16, and test the displacement of the target point 20 by the multi-point dynamic displacement detector 18;

[0070] Therefore, when the test sandbag 14 hits the target point 20, it is in a vertically set state, and the impact force of the test sandbag 14 on the top of the vertical rod 2 is a completely horizontal force. The horizontal impact force here can be calculated based on the weight of the test sandbag and the angle at which the test sandbag is lifted.

[0071] T5. Increase the weight of the test sandbag 14 in stages, and repeat the steps of T4 until the target load-bearing capacity is reached.

[0072] In actual construction, the upper limit of the weight of the test sandbag can be determined according to the test requirements. When testing the horizontal impact bearing capacity range of a trestle railing, the weight of the test sandbag can be gradually increased within a certain range until the test results (displacement of the target point, stress at the bottom of the pole, etc.) exceed the load range of the material. In this case, the trestle railing may be deformed or damaged. When verifying whether the horizontal impact bearing capacity of a trestle railing can reach the set value required for construction, it is only necessary to gradually load the weight of the test sandbag to the corresponding upper limit value to avoid damage to the trestle railing.

[0073] In this embodiment, taking a specific construction project as an example, the process of testing the bearing capacity of the trestle railing is as follows:

[0074] The horizontal bearing capacity of conventional trestle railings is 1000N. It is necessary to provide a trestle railing that can withstand a horizontal external force of 1500N. The weight loading range of the test sandbags is set to 0-2000N, and the loading is increased by 100N per level during graded loading.

[0075] The aforementioned trestle railing structure and construction method were used for construction, and the test device was assembled. The aforementioned test method was used for testing. The test sandbag was lifted inward at a 45° angle. When the test sandbag hit the target point, it can be approximately considered that the horizontal impact force on the vertical pole is equal to the gravity of the test sandbag at this time. Thus, the relationship between the weight of the test sandbag and the displacement of the target point is obtained as follows: Figure 6 shown.

[0076] It can be seen that when the railing is subjected to a horizontal impact force of 1500N, the top displacement of the railing is 3.7mm, and then the data of the steel bar strain gauge and the concrete strain gauge under the corresponding sandbag weight are read, and the root stress of the vertical pole is 38.6MPa, which does not exceed the allowable value of Q235 steel and meets the design requirements. Therefore, it can be judged that the trestle railing in this embodiment meets the horizontal impact bearing capacity of 1500N. At the same time, it can also be seen that after using the trestle railing, under the condition of relatively stable construction cost, the bearing capacity and stability of the trestle railing are effectively improved, reducing the quality and safety risks of common trestle railings during construction and use.

[0077] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A test method for a trestle railing, characterized in that: include: T1. Before pouring the concrete panel, a steel bar strain gauge in contact with the U-bolt is arranged at any position inside the concrete panel, and a concrete strain gauge is arranged between the U-bolt and the surface or bottom surface of the concrete panel; T2. After the trestle railing is installed, the top of a vertical pole is selected as the target point, and a multi-point dynamic displacement detector is set on the ground outside the trestle railing so that its detection direction faces the target point; T3, installing and fixing a test bracket on the concrete panel inside the trestle railing, with the main frame of the test bracket close to the vertical pole, and hoisting a test sandbag on the main frame to face the target point; T4, lifting the test sandbag inward at a set angle so that it hits the target point head-on after swinging freely, testing the root stress value of the vertical pole by the steel bar strain gauge and the concrete strain gauge, and testing the displacement at the target point by the multi-point dynamic displacement detector; T5, increasing the weight of the test sandbag in stages, and repeating the contents of T4 until the set target bearing capacity is reached; Wherein, the trestle railing comprises: A plurality of vertical poles are arranged at intervals on the outside of the concrete panel along the length direction of the trestle; A plurality of groups of U-shaped bolts are embedded in the concrete panel at intervals and correspond to the plurality of vertical poles one by one. Each group of U-shaped bolts includes a plurality of U-shaped bolts arranged at intervals along the height direction of the corresponding vertical pole. Each U-shaped bolt is arranged horizontally, and its arc-shaped end is located inside the concrete panel. Two bolt ends pass through the concrete panel and the corresponding vertical pole in sequence and are fixed on the outside of the vertical pole. A plurality of horizontal bars are arranged at intervals along the height direction of the vertical bars, and any horizontal bar is connected to the plurality of vertical bars one by one through a plurality of connecting devices.

2. The test method for a trestle railing according to claim 1, characterized in that: A connecting plate 1 and a connecting plate 2 are respectively sleeved on the bolt end of the U-bolt along the length direction. The connecting plate 1 is located on the inner side of the vertical pole and is locked with the inner side wall of the vertical pole through a conical nut. The connecting plate 2 is located on the outer side of the vertical pole and is locked with the outer side wall of the vertical pole through a nut.

3. The test method for a trestle railing according to claim 1, characterized in that: It also includes multiple bases, which correspond to the multiple vertical poles one by one. Any base is arranged on the outside of the bottom of the corresponding vertical pole and fixedly connected thereto. The base is a hollow structure with openings at both ends. The base is sleeved on the outside of the U-bolt along the length direction of the U-bolt, and the height of the base is equal to the thickness of the concrete panel.

4. The test method for a trestle railing according to claim 1, characterized in that: It also includes a protection groove, which is a groove-shaped structure with an opening toward the vertical poles. The protection groove is arranged on the top of the base along the length direction of the trestle and forms a channel for pipelines to pass through with the plurality of vertical poles.

5. The test method for trestle railings according to claim 1, characterized in that: It also includes a skirting board, which is vertically arranged on the top of the concrete panel and is closely connected to the inner side walls of the plurality of vertical poles.

6. The test method for trestle railings according to claim 1, characterized in that: Any connecting device comprises a sleeve, which is sleeved on the corresponding horizontal bar, and a bayonet is provided along the horizontal radial outer side of the sleeve; a flagpole buckle, which passes through the outer side wall of the corresponding vertical pole and is engaged with the bayonet.

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