CN113550223B - Pre-assembly process for truss bridge with double-assembly bolt holes - Google Patents
Pre-assembly process for truss bridge with double-assembly bolt holes Download PDFInfo
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- CN113550223B CN113550223B CN202110968318.9A CN202110968318A CN113550223B CN 113550223 B CN113550223 B CN 113550223B CN 202110968318 A CN202110968318 A CN 202110968318A CN 113550223 B CN113550223 B CN 113550223B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D6/00—Truss-type bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
The invention relates to a pre-assembly process of a truss bridge with double-assembly bolt holes, which is characterized by comprising the following steps of: the concrete pre-assembly process comprises the following steps: s1: assembling a bridge deck system; s2: assembling the upper chord and the horizontal connection; s3: assembling chord members and web plates; in the invention, a special jig frame structure is arranged for a bridge deck system, a horizontal upper chord system and a web member system of a truss bridge in a workshop, and pre-assembly is carried out in the workshop; the positions of the bolt holes in each part are determined, the problem that the bolt holes are installed on site and are not corresponding to each other to cause installation trouble is solved, and the assembling efficiency of the truss bridge on site is improved.
Description
Technical Field
The invention relates to the technical field of assembly of truss frames with double-assembly bolt holes, in particular to a pre-assembly process of truss frames with double-assembly bolt holes.
Background
The main bridge steel structure mainly comprises an upper chord member, a lower chord member, a bridge deck system, a cross beam, a left web member, a right web member, a horizontal bridge portal structure and the like; because the integral construction scheme that the steel truss girder and the guide girder are dragged and slid is adopted on site, the full-bridge steel structure is assembled in a factory in order to ensure the precision requirement in the on-site assembling process.
Adopting a plane rolling pre-assembly method during pre-assembly; the pre-assembly is carried out by systems such as pre-assembly plane pre-assembly of a lower chord bridge deck system, pre-assembly plane pre-assembly of an upper chord horizontal bridge portal frame, pre-assembly of a left side web member, a right side web member, an upper chord pre-assembly plane and a lower chord pre-assembly plane; in order to ensure the integrity of each pre-assembled system and the uniformity of references among the pre-assembled systems, the sequence of the pre-assembled systems must be reasonably arranged, a factory plans to pre-assemble a pre-assembled plane of a lower chord bridge deck system, then pre-assemble the pre-assembled plane of an upper chord horizontal bridging portal frame, finally pre-assemble left and right web members and the pre-assembled plane of the upper chord and the lower chord, and manufacture an integral truss by an auxiliary structure factory such as a ladder stand, a railing, a vertical wall, a ballast blocking wall and the like without participating in pre-assembly and field installation.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pre-assembly process for a truss bridge with double-assembly bolt holes, which can solve the problems of large hole position error and large field adjustment difficulty in field assembly of a general truss bridge with double-assembly bolt holes.
In order to solve the technical problems, the technical scheme of the invention is as follows: the pre-assembly process of the truss bridge with the double-assembly bolt holes has the innovation points that: the concrete pre-assembly process comprises the following steps:
s1: assembling a bridge deck system: according to the geometric dimensions of a design drawing, drawing the center lines of a lower chord, a cross beam and a bridge deck on a special pre-assembled platform, and then laying a jig frame according to process requirements, wherein the height of the upper opening of a jig frame template must ensure the accuracy and control the elevation error within +/-0.5 mm; the jig frame must be submitted to be qualified for check and acceptance to be used;
s1.1: after the jig frame is qualified, hanging the bridge deck on the jig frame for positioning, aligning the datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamp;
s1.2: hoisting the bridge deck end cross beam, the middle cross beam, the side cross beam and the bridge deck in sequence for preassembly, and detecting the gap and the degree of butt joint of the ports in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s1.3: hoisting the lower chord member bar, the bridge deck end cross beam, the middle cross beam and the side cross beam in sequence for preassembly, and detecting the gap and the degree of butt joint of the ports in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s1.4: performing integral complete measurement of the structure according to the pre-assembly requirement, wherein the integral complete measurement comprises detecting the integral line shape and size requirement of a full bridge, and controlling the size of each section, controlling the size of a port and the accuracy of the involution size among the sections; before the assembly jig is put down, numbering marks are made at the striking positions of the beam sections, alignment line marks of all the sectional positions are made, and temporary connecting pieces are installed;
s2: assembling the upper chord and the horizontal connection: according to the geometric dimensions of the design drawing, drawing the center lines of upper chords, horizontal connectors and bridge portal nodes on the special pre-assembled platform, and then laying a jig frame according to the process requirements, wherein the height of the upper opening of a jig frame template must be controlled within +/-0.5 mm, and the jig frame must be submitted to be qualified for use;
s2.1: after the jig frame is qualified, the upper chord member is hung on the jig frame for positioning, a datum line on the platform is aligned, and the datum line and the jig frame are temporarily fixed by a clamping horse;
s2.2: the horizontal connection and the upper chord are pre-assembled in sequence, and the gap and the degree of butt joint of the ports are detected in the assembling process; after meeting the requirements, describing a port control alignment line and installing a temporary connecting piece;
s2.3: hoisting the bridge portal frame, the lower chord and the horizontal connector in sequence for pre-assembling, and detecting the gap and the butt joint degree of the ports in the assembling process. After meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s3: assembling chord members and webs: according to the geometric dimensions of the design drawing, drawing the center lines of the chord members and the web members on the special pre-assembled platform, and then laying a jig frame according to the process requirements, wherein the standard height of the upper opening of a jig frame template must be controlled within +/-0.5 mm, and the jig frame must be submitted to be accepted for use;
s3.1: after the jig frame is qualified, hanging the main truss lower chord member on the jig frame for positioning, aligning a datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamping horse;
s3.2: hoisting and positioning all web members, connecting and fixing the web members with the chords, comprehensively checking whether the overall dimensions and the hole-making quality of the gusset plates and the splice plates are all consistent, and connecting the splice plates with the adjacent chords by using pins and tool bolts;
s3.3: hanging the main truss upper chord member on a jig frame for positioning, aligning a datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamping horse;
s3.4: pre-assembling all the node plates and the splice plates one by one, temporarily fixing the node plates and the splice plates by using pins and tool bolts, then comprehensively detecting the node plates and the splice plates by using a hole tester, and checking the close adhesion condition of the plate layers by using a clearance gauge; and after submitting and checking the qualified products, leaving a section to be trial-spliced with the next round for pre-splicing of the subsequent round, transferring the rest main truss lower chords to the integral pre-splicing field of the bridge deck system, and detaching the rest members and the node marks for surface treatment.
Furthermore, during pre-assembly, all the rod pieces are in an unstressed state and are arranged on a platform frame without fulcrum sinking in a pre-assembly field; the pre-assembled rod pieces can participate in the pre-assembly after being inspected to be qualified, and the edge and the hole edge of the rod pieces, welding slag and splashing are removed completely before the pre-assembly.
Furthermore, the fastening bolts for pre-assembly are required to enable the plate layers to be tightly attached, the punching nails of all the connecting points are not less than 10% of the total number of the holes, and the tooling bolts are not less than 20% of the total number of the holes; pre-assembly should be carried out sequentially, and after one unit is assembled, the next unit is assembled continuously after the unit is inspected and adjusted to be qualified; when the pre-assembly is carried out, all the site holes must be checked by using a hole tester, and 100 percent of bolt holes of the main truss can freely pass through the hole tester with the designed aperture being smaller than 0.75 mm: the bolt holes of the bridge deck system are required to pass through a hole tester with a diameter 1.0mm larger than the designed hole diameter 100% freely.
Further, the polishing and jacking part, the bolt hole of the joint part of the construction site and the overall geometric dimension quality are mainly checked, and meanwhile, whether the mutual interference condition exists at the splicing part or not and whether the bolt is at the part which is difficult to be screwed or not are checked; detailed examination records are required to be made in the pre-assembly process, and the marks of the rod pieces and the splice plates are made after the pre-assembly is finished.
The invention has the advantages that:
1) In the invention, a special jig frame structure is arranged for a bridge deck system, a horizontal upper chord system and a web member system of a truss bridge in a workshop, and pre-assembly is carried out in the workshop; the positions of the bolt holes in each part are determined, the problem of troublesome installation caused by the fact that the positions of the bolt holes installed on site do not correspond is solved, and the assembling efficiency of the truss bridge on site is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is an overall structure diagram of a truss bridge of a pre-assembly process of a truss bridge with double-assembly bolt holes.
Fig. 2 to 4 are diagrams illustrating a bridge deck system forming state by a pre-assembly process of a truss bridge with double-assembly bolt holes according to the invention.
Fig. 5 to 7 are upper chord and horizontal connection forming state diagrams of a pre-assembly process of a truss bridge with double-assembly bolt holes.
Fig. 8 to 10 are diagrams illustrating a state of forming a chord member and a web plate in a pre-assembly process for a truss bridge with double-assembly bolt holes according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
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 or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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.
As shown in fig. 1 to 10, a pre-assembly process for a truss bridge with double-assembly bolt holes specifically comprises the following steps:
s1: assembling a bridge deck system: according to the geometric dimensions of a design drawing, drawing central lines of a lower chord, a cross beam and a bridge deck on a special pre-assembled platform, and then laying a jig frame according to process requirements, wherein the height of an upper opening of a jig frame template must ensure accuracy and control elevation error within +/-0.5 mm; the jig frame must be submitted to be qualified for check and acceptance to be used;
s1.1: after the jig frame is qualified, hanging the bridge deck on the jig frame for positioning, aligning the datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamp;
s1.2: sequentially hoisting a bridge deck end cross beam, a middle cross beam, an edge cross beam and a bridge deck to be preassembled, and detecting the gap and the butt joint degree of the ports in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s1.3: hoisting the lower chord member bar, the bridge deck end cross beam, the middle cross beam and the side cross beam in sequence for preassembly, and detecting the gap and the degree of butt joint of the ports in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s1.4: carrying out integral completion measurement of the structure according to the pre-assembly requirement, wherein the integral completion measurement comprises the steps of detecting the integral linear shape and size requirement of a full bridge, controlling the size of each section, controlling the size of a port and adjusting the size precision of the sections; before the lower moulding bed, numbering marks are made at the striking positions of the beam sections, the alignment line marks of the sectional positions are made, and temporary connecting pieces are installed;
s2: assembling the upper chord and the horizontal connection: according to the geometric dimensions of the design drawing, drawing the central lines of upper chords, horizontal joints and portal frame nodes on the special pre-assembly platform, and then laying a jig frame according to the process requirements, wherein the elevation of the upper opening of a jig frame template must be controlled within +/-0.5 mm, and the jig frame must be submitted to acceptance for use;
s2.1: after the jig frame is qualified, the upper chord member is hung on the jig frame for positioning, a datum line on the platform is aligned, and the datum line and the jig frame are temporarily fixed by a clamping horse;
s2.2: the horizontal connection and the upper chord are pre-assembled in sequence, and the gap and the degree of butt joint of the ports are detected in the assembling process; after meeting the requirements, describing a port control alignment line and installing a temporary connecting piece;
s2.3: hoisting the bridge portal frame, the lower chord and the horizontal connector in sequence for pre-assembling, and detecting the gap and the butt joint degree of the ports in the assembling process. After meeting the requirements, describing a port control alignment line and installing a temporary connecting piece;
s3: assembling chord members and webs: according to the geometric dimensions of the design drawing, drawing the center lines of the chord members and the web members on the special pre-assembled platform, and then laying a jig frame according to the process requirements, wherein the standard height of the upper opening of a jig frame template must be controlled within +/-0.5 mm, and the jig frame must be submitted to be accepted for use;
s3.1: after the jig frame is qualified, hanging the main truss lower chord member on the jig frame for positioning, aligning a datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamping horse;
s3.2: hoisting and positioning all web members, connecting and fixing the web members with the chords, comprehensively checking whether the overall dimensions and the hole-making quality of the gusset plates and the splice plates are all consistent, and connecting the splice plates with the adjacent chords by using pins and tool bolts;
s3.3: hanging the main truss upper chord member on a jig frame for positioning, aligning a datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamping horse;
s3.4: pre-assembling all the gusset plates and the splice plates one by one, temporarily fixing the gusset plates and the splice plates by pins and tooling bolts, then comprehensively detecting the gusset plates and the splice plates by using a hole tester, and checking the close adhesion condition of the plate layers by using a clearance gauge; and after submitting and checking the qualified products, leaving a section to be trial-spliced with the next round for pre-splicing of the subsequent round, transferring the rest main truss lower chords to the integral pre-splicing field of the bridge deck system, and detaching the rest members and the node marks for surface treatment.
When in pre-assembly, each rod piece is in an unstressed state and is carried out on a platform frame without fulcrum sinking in a pre-assembly field; the pre-assembled rod pieces can participate in the pre-assembly after being inspected to be qualified, and the edge and the hole edge of the rod pieces, welding slag and splashing are removed completely before the pre-assembly.
The fastening bolts for pre-assembly are required to enable the plate layers to be tightly attached, the punching nails of all the connecting points are not less than 10% of the total number of the holes, and the tooling bolts are not less than 20% of the total number of the holes; pre-assembly should be carried out sequentially, and after each unit is assembled, the next unit is assembled in a trial manner after the unit is inspected and adjusted to be qualified; when the pre-assembly is carried out, all the site holes must be checked by using a hole tester, and 100 percent of bolt holes of the main truss can freely pass through the hole tester with the designed aperture being smaller than 0.75 mm: the bolt holes of the bridge deck system are required to pass through a hole tester with a diameter 1.0mm larger than the designed hole diameter 100% freely.
The method mainly comprises the steps of inspecting the quality of a polished jacking part, a bolt hole of a joint part of a construction site and the overall geometric dimension, and inspecting whether the splicing part has a mutual interference condition or not and whether a bolt part is difficult to be screwed or not; detailed examination records are required to be made in the pre-assembly process, and the marks of the rod pieces and the splice plates are made after the pre-assembly is finished.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. The pre-assembly process of the truss bridge with the double-assembly bolt holes is characterized by comprising the following steps of: the concrete pre-assembly process comprises the following steps:
s1: assembling a bridge deck system: according to the geometric dimensions of a design drawing, drawing the center lines of a lower chord, a cross beam and a bridge deck on a special pre-assembled platform, and then laying a jig frame according to process requirements, wherein the height of the upper opening of the jig frame must ensure the accuracy and control the elevation error within +/-0.5 mm; the jig frame must be submitted to be qualified for check and acceptance to be used;
s1.1: after the jig frame is qualified, hanging the bridge deck on the jig frame for positioning, aligning the datum line on the platform, and temporarily fixing the datum line with the jig frame by using a clamp;
s1.2: sequentially hoisting a bridge deck end cross beam, a middle cross beam, an edge cross beam and a bridge deck to be preassembled, and detecting the gap and the butt joint degree of the ports in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s1.3: sequentially hoisting a lower chord member, pre-assembling the lower chord member with a bridge deck end cross beam, a middle cross beam and an edge cross beam, and detecting the gap and the degree of butt joint in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s1.4: performing integral complete measurement of the structure according to the pre-assembly requirement, wherein the integral complete measurement comprises detecting the integral line shape and size requirement of a full bridge, and controlling the size of each section, controlling the size of a port and the accuracy of the involution size among the sections; before the lower moulding bed, numbering marks are made at the striking positions of the beam sections, the alignment line marks of the sectional positions are made, and temporary connecting pieces are installed;
s2: assembling the upper chord and the horizontal connection: according to the geometric dimensions of the design drawing, drawing the center lines of upper chords, horizontal connectors and bridge portal nodes on the special pre-assembled platform, and then laying a jig frame according to the process requirements, wherein the height of the upper opening of the jig frame must be controlled within +/-0.5 mm, and the jig frame must be submitted to acceptance for use;
s2.1: after the jig frame is qualified, the upper chord member is hung on the jig frame for positioning, a datum line on the platform is aligned, and the datum line and the jig frame are temporarily fixed by a clamping horse;
s2.2: the horizontal connection and the upper chord are pre-assembled in sequence, and the gap and the degree of butt joint of the ports are detected in the assembling process; after meeting the requirements, a port control butt joint line is carved and a temporary connecting piece is installed;
s2.3: sequentially hoisting the bridge portal frame, the lower chord and the horizontal link for pre-assembling, detecting the gap and the involution degree of the port in the assembling process, and engraving a port control involution line and installing a temporary connecting piece after meeting the requirements;
s3: assembling chord members and webs: according to the geometric dimensions of the design drawing, drawing the center lines of the chord members and the web members on the special pre-assembled platform, and then laying a jig frame according to the process requirements, wherein the standard height of the upper opening of the jig frame must be controlled within +/-0.5 mm, and the jig frame must be submitted to the acceptance for use;
s3.1: after the jig frame is qualified, hanging the main truss lower chord member on the jig frame for positioning, aligning a reference line on the platform, and temporarily fixing the reference line with the jig frame by using a clamping device;
s3.2: hoisting and positioning all the web members, connecting and fixing the web members with the chords, comprehensively checking whether the overall dimensions, the hole forming quality of the gusset plates and the splice plates are all consistent, and connecting the splice plates with the adjacent chords by using pins and tool bolts;
s3.3: hoisting the main truss upper chord member onto a jig frame for positioning, aligning a reference line on the platform, and temporarily fixing the reference line with the jig frame by using a clamping horse;
s3.4: pre-assembling all the node plates and the splice plates one by one, temporarily fixing the node plates and the splice plates by using pins and tool bolts, then comprehensively detecting the node plates and the splice plates by using a hole tester, and checking the close adhesion condition of the plate layers by using a clearance gauge; and after submitting and checking the qualified products, leaving a section to be trial-spliced with the next round for pre-splicing of the subsequent round, transferring the rest main truss lower chords to the integral pre-splicing field of the bridge deck system, and detaching the rest members and the node marks for surface treatment.
2. The pre-assembly process of the truss bridge with the double-assembly bolt holes, according to claim 1, is characterized in that: when in pre-assembly, each rod piece is in an unstressed state and is carried out on a platform frame without fulcrum sinking in a pre-assembly field; the pre-assembled rod pieces can participate in the pre-assembly after being inspected to be qualified, and the edge and the hole edge of the rod pieces, welding slag and splashing are removed completely before the pre-assembly.
3. The pre-assembly process of the truss bridge with the double-assembly bolt holes as claimed in claim 1, which is characterized in that: the fastening bolts for pre-assembly are required to make the plate layers closely attached, the impact nails of all the connecting points are not less than 10% of the total number of the holes, and the tooling bolts are not less than 20% of the total number of the holes; pre-assembly should be carried out sequentially, and after one unit is assembled, the next unit is assembled continuously after the unit is inspected and adjusted to be qualified; when the pre-assembly is carried out, all the site holes must be checked by using a hole tester, and 100 percent of bolt holes of the main truss can freely pass through the hole tester with the designed aperture being smaller than 0.75 mm: the bolt holes of the bridge deck system can freely pass through a hole tester with a diameter 1.0mm larger than the designed hole diameter by 100 percent.
4. The pre-assembly process of the truss bridge with the double-assembly bolt holes, according to claim 1, is characterized in that: the method mainly comprises the steps of inspecting the quality of a polished jacking part, a bolt hole of a joint part of a construction site and the overall geometric dimension, and inspecting whether the splicing part has a mutual interference condition or not and whether a bolt part is difficult to be screwed or not; detailed examination records are required to be made in the pre-assembly process, and the marks of the rod pieces and the splice plates are made after the pre-assembly is finished.
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| CN115041853B (en) * | 2022-06-20 | 2024-05-14 | 中铁宝桥（扬州）有限公司 | Method for manufacturing upper chord block with hollowed-out cross-section |
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| WO2010040205A1 (en) * | 2008-10-06 | 2010-04-15 | Alexandre De La Chevrotiere | Structural assemblies for constructing bridges and other structures |
| CN102277825B (en) * | 2011-05-23 | 2014-02-26 | 江苏沪宁钢机股份有限公司 | Steel truss bridge and method for fabricating same |
| KR101230292B1 (en) * | 2012-10-19 | 2013-02-12 | 부림산업개발(주) | Constructing method of railing one body type bridge |
| CN208328662U (en) * | 2018-06-13 | 2019-01-04 | 山东高速泰东公路有限公司 | A kind of combinable folding steel truss |
| CN109989352A (en) * | 2019-04-26 | 2019-07-09 | 江苏京沪重工有限公司 | A kind of Steel Truss Beam top boom and lower boom assembly moulding bed and splicing structure |
| CN212053459U (en) * | 2020-03-16 | 2020-12-01 | 天津东南钢结构有限公司 | Assembly type assembled jig frame for large steel members |
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