Fabricated support hanger of rivet pulling structure for nuclear power construction and bearing capacity obtaining method

Abstract

The invention discloses an assembly type support hanger of a rivet pulling structure for nuclear power construction and a bearing capacity obtaining method. The assembly type support hanger is composed of two support hanger beams, corner connecting pieces and an annular groove rivet connecting pair. The bearing capacity obtaining method comprises the following steps: obtaining the center bearing capacity of the ring groove rivet connection node of the assembly type support hanger; calculating the maximum bearable force and torque of the mass center B at the bearing part of the support hanger beam according to the maximum sliding force between the support hanger beam and the corner connecting piece; and calculating the connection strength required by the mass center C of the root part of the support hanger beam according to the maximum sliding force between the support hanger beam and the corner connecting piece. The assembly type support hanger beam with the support hanger of the rivet pulling structure is high in modularization degree, convenient to construct and free of welding on site, welding-free connection of the support hanger beam is achieved, and pollution to the environment in the welding process and the welding quality problem caused by human factors are avoided; the bearing capacity of the support hanger beam is checked through a simplified calculation method, and the calculation and checking efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power plant pipeline and equipment installation accessories design, and specifically to an assembled support and hanger bracket of a rivet structure for nuclear power construction and a method for obtaining the bearing capacity thereof. Background Art

[0002] Supports and hangers are the collective name for brackets and hangers. They are important non-structural components that connect the main structure of a building with the auxiliary mechanical and electrical facilities. They play a vital role in ensuring the safety of building use. They should be mainly used in building water supply and drainage, fire protection, heating, ventilation, air conditioning, electricity, communications and other parts. Prefabricated supports and hangers are different from traditional supports and hangers that are welded and installed on site. They are prefabricated in the factory and assembled on site. They are reliably connected to the main structure of the building. They are widely used in new and existing buildings due to their high degree of modularization and convenient construction.

[0003] In nuclear power plants, supports and hangers are mainly composed of three parts: the root, support and hanger beams and pipe clamp connectors. Among them, the support and hanger beams are currently still connected by traditional steel section welding methods. On-site welding of support and hanger beams has problems such as difficult construction, long cycle, and difficulty in welding quality control.

[0004] The load-bearing capacity verification method for existing welded supports and hangers in nuclear power plants is as follows: first determine the shape of the supports and hangers, the selected materials, and the stress conditions of the supports and hangers, and then analyze the stress of the supports and hangers through computer modeling and simulation. Usually, the welds between the support and hanger beams are of the same strength as the parent material, but the actual welds are affected by the workers' operation and other factors, and there are differences with the parent material. In addition, the computer modeling and simulation analysis cycle is relatively long, which is a large workload, time-consuming and labor-intensive for the tens of thousands of supports and hangers in nuclear power plants. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention discloses an assembled support and hanger with a rivet structure for nuclear power construction and a method for obtaining the bearing capacity. The purpose of the present invention is to provide an assembled support and hanger with a rivet structure for nuclear power construction, which can realize modular production of nuclear power support and hanger factories, no welding on site, and can achieve efficient and safe connection; at the same time, a method for obtaining the bearing capacity can quickly check the bearing capacity of the support and hanger in the support and hanger design stage.

[0006] The present invention is achieved through the following technical solutions:

[0007] An assembled support and hanger with a riveted structure for nuclear power construction, characterized in that the assembled support and hanger is composed of two support and hanger beams, an angle connector and a ring groove rivet connection pair;

[0008] The two support and hanger beams are both made of section steel, and both support and hanger beams are provided with connection areas at their ends, and the connection areas are provided with a plurality of rivet holes that penetrate the section steel transversely;

[0009] The corner connector is an L-shaped structure, and is provided with four side surfaces, wherein the first side surface and the second side surface are both L-shaped and are arranged parallel to each other, and the distance between the first side surface and the second side surface is the thickness of the support and hanger beam, wherein the first side surface and the second side surface are provided with a plurality of coaxial rivet holes, and the third side surface and the fourth side surface connect the inner side edges of the L-shaped structure of the first side surface and the second side surface to form a structure with a U-shaped groove in cross section;

[0010] The ring groove rivet is composed of a rivet and a collar, and a plurality of ring groove rivets are respectively passed through the rivet holes of the first side surface, the two walls of the support and hanger beam, and the second side surface in sequence for riveting and fastening.

[0011] Furthermore, the first hanger beam connection area of ​​the two support hanger beams abuts against the second hanger beam connection area, and the two hanger beam connection areas are connected by an angle connector to form an L-assembled support hanger with a corner.

[0012] Furthermore, the third side surface and the fourth side surface form an angle greater than 0° and less than 180°.

[0013] The corner connector is a casting or a plate welded part.

[0014] The present invention also discloses a method for obtaining the bearing capacity of an assembled support and hanger using the above-mentioned rivet structure for nuclear power construction, including the following method:

[0015] The bearing capacity of the center A of the ring groove rivet connection node of the assembled support and hanger includes: the sliding force and moment along the vertical direction W of the support and hanger, the horizontal direction U, and the horizontal direction V perpendicular to the support and hanger plane; obtained by the following formula:

[0016]

[0017] Among them, the sliding forces in the three directions are The torque is n is the number of ring groove rivet connection pairs, μ is the friction coefficient between the angle connector and the support and hanger beam, and P is the clamping force of the ring groove rivet connection pair.

[0018] According to the specifications of the two hanger beams, corner connectors and annular groove rivets of the pull-riveted structure assembled hanger, calculate the minimum force that produces relative displacement or separation between each hanger beam and the corner connector, which is the maximum bearing capacity at the connection node of the assembled hanger;

[0019] Among them, the maximum bearing capacity along the vertical direction W and horizontal direction U of the support and hanger is the friction force generated by the support and hanger beam and the corner connector under the clamping force of the ring groove rivet connection pair, and the calculation formula is:

[0020]

[0021] The bearing capacity in the horizontal direction V perpendicular to the plane of the support and hanger is the minimum load when the support and hanger beam is separated from the angle connector, that is, the clamping force of the ring groove rivet connection pair is overcome, and the calculation formula is:

[0022]

[0023] The maximum force and moment that the center of mass B of the support and hanger beam can withstand is calculated based on the maximum force that occurs when the support and hanger beam slides relative to the angle connector. The calculation formula is:

[0024]

[0025]

[0026] Among them, L1 is the projection distance between point B and point A along the W direction, L2 is the projection distance between point B and point A along the U direction, and L3 is the projection distance between point B and point A along the V direction.

[0027] Calculate the required connection strength of the center of mass C at the root of the support and hanger beam according to the maximum force of the slip between the support and hanger beam relative angle connectors;

[0028]

[0029] Among them, L4 is the projection distance between point C and point A along the W direction, L5 is the projection distance between point C and point A along the U direction, and L6 is the projection distance between point C and point A along the V direction.

[0030] The benefits of the present invention: Compared with the traditional welded supports and hangers in the nuclear power industry, the assembled support and hanger beams using a rivet structure have a high degree of modularization and are easy to construct, achieving a non-welding connection of the support and hanger beams, avoiding the pollution to the environment caused by the welding process and avoiding welding quality problems caused by human factors. Compared with assembled supports and hangers connected by bolts, the use of annular groove rivets to connect can avoid the problem of support and hanger failure caused by uneven axial force and looseness of the bolts. In addition, the corner connector adopts a four-sided L-shaped hollow structure. In addition to the bearing capacity of the support and hanger beam provided by the friction between the first and second sides and the support and hanger beam, the third and fourth sides themselves can provide additional bearing capacity, and the connection structure is more stable.

[0031] Compared with the existing welded supports and hangers that obtain the support and hanger bearing capacity through computer modeling, the support and hanger assembled based on the riveted structure can check the bearing capacity of the support and hanger beam through a simplified calculation method, thereby improving the calculation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the use status of the support and hanger for nuclear power of the present invention;

[0033] Figure 2This is a schematic diagram of the three-dimensional structure of the support and hanger for nuclear power of the present invention;

[0034] Figure 3 It is a schematic diagram of the front view of the end face of the support and hanger for nuclear power of the present invention;

[0035] Figure 4 This is a schematic diagram of a support and hanger beam for nuclear power of the present invention;

[0036] Figure 5 It is a schematic diagram of the three-dimensional structure of the corner connector of the support and hanger for nuclear power of the present invention;

[0037] Figure 6 It is a schematic diagram of the front view of the end face of the angle connector of the support and hanger for nuclear power of the present invention;

[0038] Figure 7 It is a schematic diagram of the ring groove rivet connection pair of the support and hanger for nuclear power of the present invention;

[0039] Figure 8 It is a schematic diagram of the bearing capacity analysis of the support and hanger for nuclear power according to the present invention.

[0040] In the figure, 1 is the root, 2 is the support and hanger, 3 is the pipe clamp connector, 4 is the pipe, 5 is the concrete wall; 2.1 is the first support and hanger beam, 2.2 is the corner connector, 2.3 is the second support and hanger beam, 2.4 is the ring groove rivet; 2.1.1 is the load-bearing area, 2.1.2 is the connection area, 2.1.3 is the rivet hole; 2.2.1 is the first side surface, 2.2.2 is the second side surface, 2.2.3 is the third side surface, 2.2.4 is the fourth side surface, 2.2.5 is the rivet hole; 2.4.1 is the ring groove rivet, 2.4.2 is the sleeve. DETAILED DESCRIPTION

[0041] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies that are the same or similar to the present invention do not exceed the scope of protection of the present invention.

[0042] Combined with the attached pictures.

[0043] like Figure 1 As shown, the support and hanger for nuclear power is composed of a root 1, a support and hanger 2, a pipe clamp connector 3 and a pipeline 4.

[0044] like Figure 2 , Figure 3 As shown, the pull-riveted structure assembled hanger 2 is composed of a first hanger beam 2.1, an angle connector 2.2, a second hanger beam 2.3 and a ring groove rivet connection pair 2.4. The first hanger beam 2.1 and the second hanger beam 2.3 can have the same structure.

[0045] like Figure 4As shown, each support and hanger beam is composed of a bearing area 2.1.1, a connection area 2.1.2 and a rivet hole 2.1.3. The support and hanger beam is a channel steel or a rectangular steel, and the rivet hole 2.1.3 penetrates along the thickness direction of the support and hanger beam.

[0046] like Figure 5 , Figure 6 As shown, the corner connector 2.2 is a hollow structure consisting of a first side surface 2.2.1, a second side surface 2.2.2, a third side surface 2.2.3 and a fourth side surface 2.2.4, wherein the first side surface 2.2.1 and the second side surface 2.2.2 are parallel to each other, and are provided with coaxial rivet holes 2.2.5, and the distance between the first side surface 2.2.1 and the second side surface 2.2.2 is the thickness of the support hanger beam; the distance between the third side surface 2.2.3 and the fourth side surface 2.2.4 can be adjusted within a range of 0° to 180° according to the relative connection position of the first support hanger beam 2.1 and the second support hanger beam 2.3.

[0047] like Figure 7 As shown, the annular groove rivet connection pair is composed of annular groove rivet 2.4.1 and a collar 2.4.2.

[0048] The connection process of the riveted structure assembled support and hanger beam of the present invention is as follows:

[0049] First, the end face of the first support hanger beam connection area 2.1.2 is abutted against the side face of the second support hanger beam connection area 2.1.2, and the corner connector 2.2 is placed in the support hanger beam connection area so that the rivet hole 2.1.3 on the support hanger beam is coaxial with the rivet hole 2.2.5 on the corner connector, and the annular groove rivet 2.4.1 passes through the first side face 2.2.1 of the corner connector 2.2, the support hanger beam and the second side face 2.2.2 of the corner connector in sequence, and then the ring 2.4.2 is riveted to the annular groove rivet 2.4.1, thereby realizing the connection between the two support hanger beams.

[0050] The method for obtaining the bearing capacity of the assembled support and hanger of the rivet structure for nuclear power construction of the present invention comprises the following method:

[0051] The bearing capacity at the center A of the ring groove rivet connection node of the assembled support and hanger includes the sliding force and moment along the vertical direction W of the support and hanger, the horizontal direction U, and the horizontal direction V perpendicular to the support and hanger plane; it is obtained by the following formula:

[0052]

[0053] Among them, the sliding forces in the three directions are The torque is n is the number of ring groove rivet connection pairs, μ is the friction coefficient between the angle connector and the support and hanger beam, and P is the clamping force of the ring groove rivet connection pair.

[0054] Combine the following Figure 8The verification of the bearing capacity of the assembled support and hanger beam of the pull-riveted structure of the present invention is further explained.

[0055] (1) According to the specifications of the two hanger beams, corner connectors and annular groove rivets of the assembled hanger support with riveted structure, calculate the minimum force that causes relative displacement or separation between each hanger beam and the corner connector and the maximum bearing capacity at the connection node of the assembled hanger support;

[0056] Among them, the friction force generated by the maximum bearing capacity of the hanger beam and the angle connector in the vertical direction W and horizontal direction U of the hanger under the clamping force of the ring groove rivet connection pair is calculated as follows:

[0057]

[0058] The bearing capacity in the horizontal direction V perpendicular to the plane of the support and hanger is the minimum load when the support and hanger beam is separated from the angle connector, that is, the clamping force of the ring groove rivet connection pair is overcome, and the calculation formula is:

[0059]

[0060] (2) The maximum force and moment that the support and hanger beam can withstand at the center of mass point B at the load-bearing position are calculated based on the maximum force that occurs when the support and hanger beam slips relative to the angle connector. The calculation formula is:

[0061]

[0062]

[0063] Among them, L1 is the projection distance between point B and point A along the W direction, L2 is the projection distance between point B and point A along the U direction, and L3 is the projection distance between point B and point A along the V direction.

[0064] (3) Calculate the required connection strength at the centroid C of the support and hanger beam root based on the maximum force that causes slippage between the support and hanger beam relative angle connectors;

[0065]

[0066] Among them, L4 is the projection distance between point C and point A along the W direction, L5 is the projection distance between point C and point A along the U direction, and L6 is the projection distance between point C and point A along the V direction.

[0067] Below Figure 8 Taking the Chinese steel support and hanger as an example, the bearing capacity of the support and hanger is calculated.

[0068] Five 8.8-grade single-groove short-tail ring-groove rivet connection pairs are used. The clamping force of the connection pair is 55kN. The friction coefficient between the square steel of the support beam and the angle connector is 0.1. L1=100mm, L2=400mm, L3=100mm, L4=350mm, L5=100mm, L6=100mm.

[0069] (1) The maximum bearing capacity at the connection node A of the ring groove rivet is:

[0070]

[0071] (2) The bearing capacity of the center of mass B of the support beam is:

[0072]

[0073]

[0074] (3) The bearing capacity at the centroid C of the root of the support beam is:

[0075]

Claims

1. An assembled support and hanger with a riveted structure for nuclear power construction, characterized in that: The assembled support and hanger consists of two support and hanger beams, angle connectors and annular groove rivet connection pairs; The two support and hanger beams are both made of section steel, and both support and hanger beams are provided with connection areas at their ends, and the connection areas are provided with a plurality of rivet holes that penetrate the section steel transversely; The corner connector is an L-shaped structure, and is provided with four side surfaces, wherein the first side surface and the second side surface are both L-shaped and are arranged parallel to each other, and the distance between the first side surface and the second side surface is the thickness of the support and hanger beam, wherein the first side surface and the second side surface are provided with a plurality of coaxial rivet holes, and the third side surface and the fourth side surface connect the inner side edges of the L-shaped structure of the first side surface and the second side surface to form a structure with a U-shaped groove in cross section; The ring groove rivet is composed of a rivet and a collar, and a plurality of ring groove rivets are respectively passed through the rivet holes of the first side surface, the two walls of the support and hanger beam, and the second side surface in sequence for riveting and fastening.

2. The assembled support and hanger of the rivet structure for nuclear power construction according to claim 1 is characterized by: The first hanger beam connection area of ​​the two support hanger beams abuts against the second hanger beam connection area, and the two hanger beam connection areas are connected by an angle connector to form an L-assembled support hanger with a corner.

3. The assembled support and hanger of the riveted structure for nuclear power construction according to claim 2 is characterized by: The third side surface and the fourth side surface form an angle greater than 0° and less than 180°.

4. The assembled support and hanger of the riveted structure for nuclear power construction according to claim 2 is characterized by: The corner connector is a casting or a plate welded part.

5. A method for obtaining the bearing capacity of an assembled support and hanger of a rivet structure for nuclear power construction, characterized in that The following methods are included: The bearing capacity of the center A of the ring groove rivet connection node of the assembled support and hanger includes: the sliding force and moment along the vertical direction W of the support and hanger, the horizontal direction U, and the horizontal direction V perpendicular to the support and hanger plane; obtained by the following formula: Among them, the sliding forces in the three directions are The torque is n is the number of ring groove rivet connection pairs, μ is the friction coefficient between the angle connector and the support and hanger beam, and P is the clamping force of the ring groove rivet connection pair.

6. The method for obtaining the bearing capacity of the assembled support and hanger of the rivet structure for nuclear power construction according to claim 5 is characterized in that: According to the specifications of the two hanger beams, corner connectors and annular groove rivets of the pull-riveted structure assembled hanger, calculate the minimum force that produces relative displacement or separation between each hanger beam and the corner connector, which is the maximum bearing capacity at the connection node of the assembled hanger; Among them, the maximum bearing capacity along the vertical direction W and horizontal direction U of the support and hanger is the friction force generated by the support and hanger beam and the corner connector under the clamping force of the ring groove rivet connection pair, and the calculation formula is: The bearing capacity in the horizontal direction V perpendicular to the plane of the support and hanger is the minimum load when the support and hanger beam is separated from the angle connector, that is, the clamping force of the ring groove rivet connection pair is overcome, and the calculation formula is:

7. The method for obtaining the bearing capacity of the assembled support and hanger of the rivet structure for nuclear power construction according to claim 5, characterized in that: The maximum force and moment that the center of mass B of the support and hanger beam can withstand is calculated based on the maximum force that occurs when the support and hanger beam slides relative to the angle connector. The calculation formula is: Among them, L1 is the projection distance between point B and point A along the W direction, L2 is the projection distance between point B and point A along the U direction, and L3 is the projection distance between point B and point A along the V direction.

8. The method for obtaining the bearing capacity of the assembled support and hanger of the rivet structure for nuclear power construction according to claim 5, characterized in that: Calculate the required connection strength of the center of mass C at the root of the support and hanger beam according to the maximum force of the slip between the support and hanger beam relative angle connectors; Among them, L4 is the projection distance between point C and point A along the W direction, L5 is the projection distance between point C and point A along the U direction, and L6 is the projection distance between point C and point A along the V direction.

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