CN112177157B - Tolerance semi-rigid node and construction method - Google Patents
Tolerance semi-rigid node and construction method Download PDFInfo
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- CN112177157B CN112177157B CN202011081816.3A CN202011081816A CN112177157B CN 112177157 B CN112177157 B CN 112177157B CN 202011081816 A CN202011081816 A CN 202011081816A CN 112177157 B CN112177157 B CN 112177157B
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- 238000010276 construction Methods 0.000 title claims abstract description 26
- 210000001503 joint Anatomy 0.000 claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 13
- 238000005520 cutting process Methods 0.000 abstract description 4
- 238000011900 installation process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000003032 molecular docking Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2406—Connection nodes
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The invention discloses a tolerance semi-rigid node and a construction method, wherein the construction method comprises the following steps: prefabricating a first rod piece and a second rod piece, and fixing end plates at the end parts of the first rod piece and the second rod piece respectively; the sum of the lengths of the first rod piece and the second rod piece is smaller than the designed length of the rod body formed after the first rod piece and the second rod piece are in butt joint; installing the first rod piece, and installing the second rod piece again after the position of the first rod piece is stably in place; temporarily fixing the first rod piece and the second rod piece by adopting a common bolt, and measuring the size of a butt joint gap between the first rod piece and the second rod piece; plugging a gasket group with proper thickness into the butt joint gap; and connecting the first rod piece and the second rod piece by adopting a high-strength bolt, replacing a common bolt by adopting the high-strength bolt, and screwing to design a preset fastening shaft force. The installation method of the tolerance semi-rigid node can automatically digest a certain range of rod piece processing errors and field installation errors in the installation process, is beneficial to improving the installation efficiency, avoids field cutting/lengthening operation and improves the construction quality.
Description
Technical Field
The invention relates to the technical field of building structures, in particular to a tolerance semi-rigid node and a construction method.
Background
In industrial buildings and civil buildings, metal structures such as steel structures are often used for main structures of buildings due to the characteristics of light weight, high strength, small cross section and high construction speed, particularly in single-storey and multi-storey industrial factory building projects, the application proportion of the steel structures is very high, and large-span and large-space building structures can be easily realized in an assembly mode through matching of steel columns, steel beams, steel roof trusses and related rod pieces. However, the steel members are prefabricated members, the geometric dimensions of the prefabricated members are confirmed in a factory, and the flexible adjustment cannot be realized on a construction site. During construction and installation, the rod piece is difficult to place or the butt joint gap is too large frequently due to poor component processing and manufacturing precision, rod piece deformation, field installation errors and other problems, and the installation efficiency and the installation quality are seriously affected.
The joint in the prior art adopts a direct butt joint method, two side members are directly connected through an end plate, one side member is firstly installed, and after the joint is initially in place, the other side member is installed and is in butt joint and fixed with the joint. However, in this direct butt joint method, after the installation of one member, due to the machining precision of the member and the installation error in the field, when the other member is installed, the in-place size is often insufficient, or the butt joint gap is too large, further cutting and lengthening treatment are required in the field, the construction efficiency is low, and the treatment quality is difficult to ensure.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the problem of difficult butt joint of a joint butt joint structure in the prior art due to component machining errors, so that a tolerance semi-rigid node and a construction method are provided.
In order to solve the technical problems, the technical scheme of the invention is as follows:
the invention also provides a construction method of the tolerance semi-rigid node, which comprises the following steps:
step S10, prefabricating a first rod piece and a second rod piece, and fixing end plates at the ends of the first rod piece and the second rod piece respectively; the sum of the lengths of the first rod piece and the second rod piece is smaller than the designed length of the rod body formed after the first rod piece and the second rod piece are in butt joint;
step S20, mounting the first rod piece, and mounting the second rod piece again after the position of the first rod piece is stably in place;
step S30, temporarily fixing the first rod piece and the second rod piece by using common bolts, and measuring the size of a butt joint gap between the first rod piece and the second rod piece;
step S30, plugging a gasket group with proper thickness into the butt joint gap;
and step S40, connecting the first rod piece and the second rod piece by high-strength bolts, replacing common bolts by the high-strength bolts, and screwing until a preset fastening shaft force is designed to form a complete stress structure.
On the other hand, the invention also provides a tolerance semi-rigid node which comprises a first rod piece and a second rod piece, wherein the first rod piece and the second rod piece are mutually butted, a first end plate is arranged at the end of the first rod piece, a second end plate is arranged at the end of the second rod piece, the first end plate and the second end plate are oppositely arranged, a butting gap is formed between the first end plate and the second end plate, a gasket group is inserted into the butting gap, and the first rod piece and the second rod piece are connected into an integral stress structure through a plurality of groups of bolts penetrating through the first end plate and the second end plate.
Further, the shape of the gasket group is the same as that of the abutting surface of the first rod piece and the second rod piece.
Further, the gasket group comprises a gasket, and at least two open grooves for the bolts to pass through are formed in the gasket.
Furthermore, the gasket group comprises a plurality of gaskets, and each gasket is provided with at least one open slot for the bolt to pass through.
Further, the shape of the gasket is rectangular or circular.
Further, the thickness of the gasket is matched with the width of a butt joint gap between the first rod piece and the second rod piece.
Furthermore, the first rod piece and the second rod piece are any one of H-shaped steel, box-shaped steel and circular tubes.
Further, the outer size of the first end plate is not smaller than that of the first rod piece; the outer dimension of the second end plate is not smaller than that of the second rod piece.
Further, the overall dimension of the first end plate is larger than that of the first rod piece, and a first stiffening plate is arranged between the first end plate and the first rod piece; the outer dimension of the end plate II is larger than that of the rod piece II, and a stiffening plate II is arranged between the end plate II and the rod piece II.
The technical scheme of the invention has the following advantages:
1. the construction method of the tolerance semi-rigid node provided by the invention has the advantages that the two side rod pieces and the end plates are manufactured in a factory, the designed lengths of the two side rod pieces are slightly smaller than the actual lengths of the two end plates after the two side rod pieces are in butt joint, a certain butt joint gap is reserved between the two end plates, the rod piece processing errors and field installation errors with a certain range can be automatically digested in the installation process, the installation efficiency is favorably improved, the field cutting/lengthening operation is avoided, and the construction efficiency and the construction quality are improved. In addition, when enough working faces are provided, multiple regions can be flexibly arranged for simultaneous construction, and long construction period is avoided when the working faces are sequentially pushed from one end to the other end.
2. According to the tolerance semi-rigid node provided by the invention, the end plates are arranged at the ends of two butted rod pieces, the butt joint gap is preset between the two end plates, the two end plates are firstly preliminarily fixed through common bolts, then the gasket group is plugged into the butt joint gap, then the two end plates are fixed through other mounting holes between the two end plates by passing high-strength bolts through, and the original common bolts are replaced by the high-strength bolts, so that a complete stress structure is formed. The node performance of the tolerance semi-rigid docking structure is good, and the influence of the processing error of the rod piece and the docking error of the field construction on the docking operation can be eliminated; the disassembly and the modification are convenient, and the later maintenance and the replacement of parts are convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic node diagram of a tolerance semi-rigid structure according to an embodiment of the present invention;
FIG. 2 is a schematic node diagram of a tolerance semi-rigid structure according to a second embodiment of the present invention;
FIG. 3 is a schematic node diagram of a tolerance semi-rigid structure according to a third embodiment of the present invention;
FIG. 4 is a schematic node diagram of a tolerance semi-rigid structure according to a fourth embodiment of the present invention;
FIG. 5 is a schematic view of a node of a tolerance semi-rigid structure according to a fifth embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a first embodiment of a gasket set;
FIG. 7 is a schematic cross-sectional view of a node of a second shim group according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of a third exemplary embodiment of a third gasket set;
fig. 9 is a schematic node cross-sectional view of a fourth gasket set according to an embodiment of the invention.
Description of reference numerals: 1. a first rod piece; 2. a first end plate; 3. a second rod piece; 4. a second end plate; 5. a bolt; 6. a gasket; 7. a stiffening plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
The tolerance semi-rigid node comprises a first rod piece 1 and a second rod piece 3 which are mutually butted, wherein a first end plate 2 is arranged at the end part of the first rod piece 1, a second end plate 4 is arranged at the end part of the second rod piece 3, the first end plate 2 and the second end plate 4 are oppositely arranged, a butt joint gap is formed between the first end plate and the second end plate, a gasket group is inserted into the butt joint gap and comprises one or more gaskets 6, the thickness of each gasket 6 is matched with the width of the butt joint gap between the first rod piece 1 and the second rod piece 3, and the first rod piece 1 and the second rod piece 3 are connected into an integral stress structure through a plurality of groups of bolts 5 penetrating through the first end plate 2 and the second end plate 4.
In the present embodiment, the shape of the gasket set is the same as the shape of the abutting surface of the first rod 1 and the second rod 3. The shim packs may be rectangular or circular depending on the shape of the bar interfacing surfaces. The gasket group may be constituted by one gasket 6, or may be constituted by two or more gaskets 6. When the rod piece is H-shaped steel and the cross section of the rod piece is rectangular, the gasket group is also rectangular. The gasket group shown in fig. 6 is composed of a gasket 6, two open grooves for the bolts 5 to pass through are formed in the gasket 6, after the two end plates are fixed by the six bolts 5, the three bolts 5 uniformly arranged at intervals pass through each open groove, so that the position of the gasket 6 is limited, and the gasket 6 is prevented from rotating in the circumferential direction. Another gasket group shown in fig. 7 is composed of two gaskets 6 with the same shape, four open slots are arranged on the gasket 6, the open slots on the two gaskets 6 are oppositely arranged to form a closed space, and the bolt 5 penetrates through the open slots and is positioned at the slot bottom of each open slot. As shown in fig. 8, another gasket group is composed of two groups of four gaskets 6, each gasket group has two gaskets 6 with opposite open grooves, taking the view angle shown in the figure as an example, the two gaskets 6 positioned above and below are a group of gaskets 6, the two gaskets 6 are in a long rectangular shape, three open grooves are formed in the gaskets 6, and a bolt 5 can pass through the bottom of each open groove; two gaskets 6 that are located in the middle of the above-mentioned a set of gasket 6 constitute another set of gasket 6, and two gaskets 6 of another set of gasket 6 are one left and one right setting, have all seted up an open slot on every gasket 6, and the open slot on two gaskets 6 sets up in opposite directions.
When the rod piece is box-shaped steel or a round pipe, the cross section of the rod piece is round, and the shape of the gasket group is round. As shown in fig. 9, the circular ring-shaped gasket set includes four arc-shaped gaskets 6, each gasket 6 is provided with an open slot, two ends of each gasket 6 are also provided with notches, two notches of two gaskets 6 butted with each other form another open slot together, and the gasket set has eight open slots of four gaskets 6.
This kind of tolerance semi-rigid node, the tip at two poles of butt joint all sets up the end board, and preset the butt joint clearance between two end boards, pass two initial fixed end boards of mounting hole between the end board through ordinary bolt earlier, then fill in the butt joint clearance with gasket 6, ordinary bolt is located the recess of gasket 6 just this moment, reuse high strength bolt passes two end boards of other mounting holes fixed between two end boards, and adopt high strength bolt to replace original ordinary bolt, form complete atress structure. The tolerance semi-rigid docking structure has better node performance, and can eliminate the influence of rod piece processing errors and field construction docking errors on docking operation; the disassembly and the modification are convenient, and the later maintenance and the replacement of parts are convenient.
Example two
The difference between the tolerance semi-rigid node shown in fig. 2 and the first embodiment is that stiffening plates 7 arranged along the extending direction of the rod members are arranged at the middle positions of the first end plate 2 and the second end plate 4, so that the structural strength of the tolerance semi-rigid node is improved, and the requirement of the whole structure on bearing capacity is met.
EXAMPLE III
A tolerance semi-rigid node as shown in fig. 3 differs from the first embodiment in that the cross-sectional widths of the first end plate 2 and the second end plate 4 are larger than the cross-sectional widths of the first rod 1 and the second rod 3 to meet the rigidity requirement of the butt joint node.
Example four
The difference between the tolerance semi-rigid node shown in fig. 4 and the third embodiment is that stiffening plates 7 are connected between the middle positions of the first end plate 2 and the second end plate 4 and between the outward protruding parts of the end plates and the rod members, so that the structural strength of the tolerance semi-rigid node is improved, and the requirement of the whole structure on bearing capacity is met.
EXAMPLE five
The difference between the tolerance semi-rigid node shown in fig. 5 and the first embodiment is that the first rod member 1 and the second rod member 3 are both box-shaped steel or round steel members, the cross-sectional widths of the first end plate 2 and the second end plate 4 are larger than the cross-sectional widths of the first rod member 1 and the second rod member 3, and stiffening plates 7 are connected between the first end plate 2 and the first rod member 1 and between the second end plate 4 and the second rod member 3. The bolt 5 is connected to the part of the end plate protruding out of the rod.
EXAMPLE six
The invention also provides a construction method of the tolerance semi-rigid node, which comprises the following steps:
step S10, prefabricating a rod piece I, a rod piece II and end plates in a factory, and fixing the end plates at the ends of the rod piece I and the rod piece II respectively; the sum of the lengths of the first rod piece and the second rod piece is smaller than the designed length of the rod body formed after the first rod piece and the second rod piece are butted;
step S20, mounting the first rod piece, and mounting the second rod piece again after the position of the first rod piece is stably in place;
step S30, temporarily fixing the first rod piece and the second rod piece by adopting common bolts, and measuring the size of a butt joint gap between the first rod piece and the second rod piece;
step S30, plugging a gasket group with proper thickness into the butt joint gap;
and step S40, connecting the first rod piece and the second rod piece by high-strength bolts, replacing common bolts by the high-strength bolts, and screwing until a preset fastening shaft force is designed to form a complete stress structure.
The construction method of the tolerance semi-rigid node is characterized in that the two side rod pieces and the end plates are manufactured in a factory, the designed lengths of the two side rod pieces are slightly smaller than the actual lengths of the two end plates after the two side rod pieces are in butt joint, a certain butt joint gap is reserved between the two end plates, the rod piece machining errors and field installation errors with a certain range can be automatically digested in the installation process, the installation efficiency is favorably improved, the field cutting/lengthening operation is avoided, and the construction efficiency and the construction quality are improved. In addition, when enough working surfaces are provided, simultaneous construction of multiple areas can be flexibly arranged, and long construction period is avoided when the working surfaces are sequentially pushed from one end to the other end.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (8)
1. A construction method of a tolerance semi-rigid node is characterized by comprising the following steps:
step S10, prefabricating a first rod piece and a second rod piece, and respectively fixing end plates at the end parts of the first rod piece and the second rod piece; the sum of the lengths of the first rod piece and the second rod piece is smaller than the designed length of the rod body formed after the first rod piece and the second rod piece are butted;
step S20, mounting the first rod piece, and mounting the second rod piece again after the position of the first rod piece is stably in place;
step S30, temporarily fixing the first rod piece and the second rod piece by using common bolts, and measuring the size of a butt joint gap between the first rod piece and the second rod piece;
step S30, plugging a gasket group with proper thickness into the butt joint gap; the gasket group is composed of two groups of four gaskets, each group of gasket group is provided with two gaskets with opposite open grooves, the two gaskets positioned above and below are a group of gaskets, the two gaskets are in long rectangular shapes, three open grooves are formed in the gaskets, and a bolt can pass through the bottom of each open groove; the two gaskets positioned in the middle of the group of gaskets form another group of gaskets, the two gaskets of the other group of gaskets are arranged left and right, each gasket is provided with an open slot, and the open slots on the two gaskets are arranged oppositely;
and step S40, connecting the first rod piece and the second rod piece by high-strength bolts, replacing common bolts by the high-strength bolts, and screwing until a preset fastening shaft force is designed to form a complete stress structure.
2. A tolerance semi-rigid node is characterized by comprising a first rod piece (1) and a second rod piece (3) which are butted with each other, wherein the end part of the first rod piece (1) is provided with a first end plate (2), the end part of the second rod piece (3) is provided with a second end plate (4), the first end plate (2) and the second end plate (4) are oppositely arranged with a butting gap, a gasket group is inserted into the butting gap, and the first rod piece (1) and the second rod piece (3) are connected into an integral stress structure through a plurality of groups of bolts (5) penetrating through the first end plate (2) and the second end plate (4); the gasket group is composed of two groups of four gaskets, each group of gasket group is provided with two gaskets (6) with opposite open grooves, the two gaskets (6) positioned above and below are a group of gaskets, the two gaskets (6) are in a long rectangular shape, the three open grooves are formed in the gaskets (6), and the bottom of each open groove can be penetrated by a bolt; two gaskets (6) positioned in the middle of the group of gaskets form another group of gaskets, two gaskets (6) of another group of gaskets are arranged on the left, the right and the left, an open slot is formed in each gasket (6), and the open slots in the two gaskets are arranged oppositely.
3. The tolerance semi-rigid node of claim 2, wherein the shim packs are shaped the same as the shape of the interfacing surfaces of the first and second rods (1, 3).
4. The tolerance semi-rigid node according to claim 2, wherein the shim (6) is rectangular or circular in shape.
5. The tolerance semi-rigid node according to claim 2, wherein the thickness of the shim (6) is adapted to the width of the butt gap between the first rod (1) and the second rod (3).
6. The tolerance semi-rigid node of claim 2, wherein the first rod member (1) and the second rod member (3) are any one of H-section steel, box section steel, and round pipe.
7. The tolerance semi-rigid node of claim 2, wherein the end plate one (2) has a physical dimension no less than the physical dimension of the rod one (1); the outer dimension of the second end plate (4) is not less than that of the second rod piece (3).
8. The tolerance semi-rigid node according to claim 7, wherein the outer dimension of the first end plate (2) is larger than the outer dimension of the first rod member (1), and a first stiffening plate is arranged between the first end plate (2) and the first rod member (1); the outer dimension of the second end plate (4) is larger than that of the second rod piece (3), and a second stiffening plate is arranged between the second end plate (4) and the second rod piece (3).
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| CN202011081816.3A CN112177157B (en) | 2020-10-10 | 2020-10-10 | Tolerance semi-rigid node and construction method |
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| CN202011081816.3A CN112177157B (en) | 2020-10-10 | 2020-10-10 | Tolerance semi-rigid node and construction method |
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| CN112177157B true CN112177157B (en) | 2022-07-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2003013498A (en) * | 2001-06-29 | 2003-01-15 | Sekisui House Ltd | Column body for steel-structure building |
| CN208604765U (en) * | 2018-03-23 | 2019-03-15 | 新世界中国地产有限公司 | The connection component and steel-concrete combined structure system of girder steel and reinforced concrete structure |
| CN108842915A (en) * | 2018-08-31 | 2018-11-20 | 武汉建工集团股份有限公司 | A kind of rigid connection node and its processing installation method of steel construction rectangle rod piece |
| CN109537726B (en) * | 2018-12-29 | 2023-08-29 | 天津大学 | Rectangular steel pipe column-H steel beam full-bolt connection semi-rigid joint and construction method |
| CN111218941A (en) * | 2020-04-13 | 2020-06-02 | 北京中岩大地科技股份有限公司 | Combined type section steel supporting rod piece |
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