CN114319596A - Manufacturing method of umbrella-shaped conversion structure - Google Patents
Manufacturing method of umbrella-shaped conversion structure Download PDFInfo
- Publication number
- CN114319596A CN114319596A CN202111631750.5A CN202111631750A CN114319596A CN 114319596 A CN114319596 A CN 114319596A CN 202111631750 A CN202111631750 A CN 202111631750A CN 114319596 A CN114319596 A CN 114319596A
- Authority
- CN
- China
- Prior art keywords
- welding
- plate
- line
- outer contour
- manufacturing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a manufacturing method of an umbrella-shaped conversion structure, which comprises the following steps of 1) manufacturing a single-section circular tube body, 2) manufacturing a first section, 3) manufacturing a second section, 4) closing the first section and the second section, aligning stiffening plates at the upper section and the lower section, and welding the rest welding seams; 5) manufacturing eight I-shaped variable cross-section conversion BH beam bodies, 6) marking out a general assembly ground sample line with an inverted umbrella-shaped conversion structure on a horizontal table, 7) positioning and assembling the II box-type bracket according to an installation reference line, and 8) completing welding of the II box-type bracket. The deformation of the stiffening plates in all directions of the pipe sections is controllable, the flanges of the bracket of the II-shaped box are not easy to tear in a layered manner and are reasonably segmented, and the manufacturing precision is controlled and meanwhile the transportation and the field installation are facilitated.
Description
Technical Field
The invention relates to the field of buildings, in particular to a manufacturing method of an umbrella-shaped conversion structure.
Background
The outer frame of the traditional high-rise frame-tube structure system directly falls to the ground and directly transfers force, and in order to realize the building effect of the open type large space without columns, the outer frame does not adopt a direct falling mode, but the load of the outer frame is intensively transferred to the corner large column through the umbrella-shaped conversion structure.
Only 4 circular columns are reserved on the outer frame of 1-4 layers at the bottom, and the specification is 2800 x 80 mm; in order to effectively transmit the load of 5 layers and more of outer frames to the bottom circular pipe column, the 5 layers adopt an umbrella-shaped conversion structure system, eight I-shaped variable-section conversion BH beams are arranged along the radial direction of the pipe column, the section height of the root part (connected with the pipe column) of each conversion BH beam is 4.2m, and the section height of the end part (connected with the outer frame or the core barrel) is 1.5 m.
The circumference of the pipe column is provided with 8 conversion BH beams, 4 types are adopted, and the bracket angles at two ends of different types are different; the giant pipe column is connected with 8 conversion BH beams, every two conversion BH beams are connected, the connection relation of the umbrella-shaped integral structure is multiple, the directions are different, and the structural size precision requirement of each unit is very high. The plate is 70-120 mm thick and is made of Q390GJ and Q420 GJ; the material is high, the plate thickness and the size are large, the node combination is complex, the post-welding correction is difficult, the post-welding repair of the ultra-thick plate is difficult, and time and labor are wasted; the deformation and the welding quality need to be controlled in the welding process, and the high requirement that the welding is basically qualified after the welding is finished is met.
In the published comparison document CN 201710531259-method for manufacturing a cross-column rotary-round-column structure and the cross-column rotary-round-column structure thereof, a method of directly nesting an annular H-shaped corbel 7 into a round tube part 2 after combined welding is adopted, the precision requirement on the round tube is extremely high, 8 long weld joints of 4 circular arc plates are welded to form the round tube, sealing plates 6 are only arranged at the upper and lower ports of the round tube, the welding deformation of other positions of the tube section is not controlled, the node position of the tube section is easy to deform, the welding is difficult to correct, and the assembled and welded annular corbel can not be directly nested actually; and 4 circular arc boards and cross stiffening plate 3 form the T-joint, do not see anti lamellar and tear the welding process measure, the stiffening plate 3 is easy lamellar to tear, the internal quality of welding seam has hidden danger, thus influence the structural safety.
Disclosure of Invention
In order to solve the problems, the invention discloses a manufacturing method of an umbrella-shaped conversion structure, the overall size of the umbrella-shaped conversion structure reaches 14 × 6 (m), and the overall weight of the structure is about 400 tons. Considering the transportation limitation and technical process requirements from my department to Shanghai work places along the way, the department specially designs a segmentation scheme so that the segmentation scheme can meet the requirements of transportation and installation at the same time. The deformation of the stiffening plates in all directions of the pipe sections is controllable, the flanges of the bracket of the II-shaped box are not easy to tear in a layered manner and are reasonably segmented, and the manufacturing precision is controlled and meanwhile the transportation and the field installation are facilitated.
The technical scheme of the invention is as follows: the manufacturing method of the umbrella-shaped conversion structure comprises the following steps:
step one, manufacturing a single-section circular tube body: blanking and cutting the steel plate, and marking a central line of a circle and a circumferential bisector of radial 1/4; 2) the pressure head is pre-bent to enable the straight sections at the two ends of the steel plate to form an arc shape without protruding; 3) arranging a groove; 4) rounding and forming by a special plate bending machine; 5) longitudinal welding seam welding; 6) re-loading the plate rolling machine to return to the round shape, and correcting to be qualified;
step two, manufacturing a segment I, namely assembling an inner ring plate, an outer ring plate and stiffening plates by taking the column top as a reference, drawing out a central line and an outer contour line of the upper 8 stiffening plates corresponding to the outer ring, and checking and adjusting a welding side in a welding process by using a hammered line and the central line and the outer contour line on the ring plate as references, so that the situation that the rigidity is too large and the anti-deformation force is insufficient after the filling of one side is too large is avoided, and finally the 8 stiffening plates are ensured to be matched with the outer contour line; finally welding the welding seams of the stiffening plate and the ring plate side, and paying attention to symmetrical welding;
manufacturing a third section II, namely marking out an outer contour line and a positioning center line after welding and inspecting the circular plate which is divided into four equal parts at the top of the column; in the same step two, welding 8 welding seams of the stiffening plate and the column wall of the column to ensure that the stiffening plate is matched with the outer contour line, and then welding the welding seams of the stiffening plate and the side of the ring plate;
step four, closing the first segment and the second segment, aligning the stiffening plates at the upper and lower segments, and welding the rest welding seams;
manufacturing eight I-shaped variable cross-section conversion BH beam bodies, cutting steel plates in a blanking mode, and scribing a folded plate line and an installation reference line; 2) checking a special oil press folded plate and an arc plate until the plate is qualified; 3) after the large special-shaped I-shaped is assembled, welding a welding seam of the body by using a trolley submerged-arc welding method; 4) assembling and welding the stiffening plates at the variable cross positions by taking the end parts as a reference, and checking and correcting to be qualified;
drawing a general assembly ground sample line with an inverted umbrella-shaped conversion structure on a horizontal table, hanging the body part manufactured in the step 1 and the step five on the horizontal table, sequentially aligning the outer contour line of the outer ring of the steel pipe and the outer contour lines of eight conversion BH beams, checking the misalignment condition of the butt joint of the pipe column stiffening plate and the conversion BH beam web plate, and after the adjustment is qualified, positioning and fixing the end part of the conversion BH beam with an outer ring plate, the pipe column stiffening plate and a clamping plate for a jig frame respectively;
seventhly, positioning and assembling the II box-type corbels according to an installation datum line, and carrying out integral installation or bulk installation on the II box-type corbels according to welding influences of different angles; performing a pre-welding ground sample report test, and fixing the angle and the port mouth shape of the II box type bracket by using a temporary support after the II box type bracket is qualified;
step eight, measuring the end point information of each branch by using a total station under the condition of integral assembly; detaching each branch, completing II box type corbel welding, finally measuring the welded data of each branch by using a total station, and comparing and rechecking the data with the data during the whole installation; and (5) finding problems and adjusting in time.
Further, positioning, assembling and welding quartered inner ring plates on the roller carrier in the second step; the lifting roller frame is vertically placed, the quartered outer ring plates are positioned and assembled by taking the column top as a reference, and the stiffening plates on the upper side and the lower side of the outer ring are positioned and assembled by taking the round pipe installation reference line as a reference.
Furthermore, the thickness of the stiffening plate in the second step is 70-110 mm.
And further, in the third step, the outer contour line of the pipe section, the positioning center line of the stiffening plate and the outer contour line corresponding to the circular ring are marked on the circular ring plate by taking the installation reference line as a reference.
Further, the assembly ground sample line in the sixth step comprises a steel pipe body outer contour projection ground sample line, a steel pipe outer ring plate outer contour projection ground sample line, a steel pipe stiffening plate center reference ground sample line, eight I-shaped conversion BH beam center reference ground sample lines, a II box-type bracket center reference ground sample line, a II box-type bracket end face position ground sample line and a conversion structure integral outer contour projection ground sample line.
The invention has the advantages that: the invention is segmented according to the structural characteristics, and is reversely manufactured and integrally installed; the simple plumb line and the projection ground sample lines of different branches are used for reflecting the angle of each branch, so that a welder can observe the angular deformation in the welding process of the ultra-thick plate conveniently, the welding side can be adjusted in time, the phenomenon that the welded side cannot be corrected is avoided, and the deformation of the stiffening plate in each direction of the pipe section is controllable; the total station is used for measuring the data of each connecting end point during the whole assembly of different branches and after the lower tire welding, so that the precision of the connecting end point of each branch is greatly improved, and the workload of secondary tire mounting or preassembly is avoided by comparing the measured data; the reasonable segmentation also facilitates transportation and field installation; and the flange of the angle joint is not easy to be torn in a layered manner by adopting the II-shaped box bracket with the flange extending out.
Drawings
FIG. 1 is a schematic view of the overall structure of the umbrella-shaped conversion structure of the present invention;
FIG. 2 is a schematic view of an externally stiffened ground sample line of a section of a steel pipe body according to the present invention;
FIG. 3 is a schematic view of a ground sample line reinforced externally by a steel pipe body segment according to the present invention;
FIG. 4 is a schematic view of the first and second closure of the steel pipe body segments of the present invention;
FIG. 5 is a schematic view of a final assembly ground sample line with an inverted umbrella-shaped conversion structure according to the present invention;
FIG. 6 is a schematic view of the steel pipe column and the conversion BH beam of the umbrella-shaped conversion structure of the present invention assembled integrally;
FIG. 7 is a schematic view of the umbrella switch self-contained structure of the present invention.
Wherein: 1. the device comprises a circular tube, 2 circular ring plates, 3 stiffening plates, 4 conversion BH beams, 5 II type box brackets, 6 outer contour lines, 7 sections I, 8 sections II.
Detailed Description
For the purpose of enhancing an understanding of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1-7, the method for manufacturing the umbrella-shaped conversion structure comprises the following steps:
step one, manufacturing a single-section circular tube body 1: blanking and cutting the steel plate, and marking a central line of a circle and a circumferential bisector of radial 1/4; 2) the pressure head is pre-bent to enable the straight sections at the two ends of the steel plate to form an arc shape without protruding; 3) arranging a groove; 4) rounding and forming by a special plate bending machine; 5) longitudinal welding seam welding; 6) re-loading the plate rolling machine to return to the round shape, and correcting to be qualified;
step two, manufacturing a section I, namely assembling an inner ring plate, an outer ring plate and a stiffening plate by taking the column top as a reference, wherein the thickness of the stiffening plate 3 is 70-110 mm, and positioning, assembling and welding quartered inner ring plates on a roller frame; hanging and placing the steel wire rope from a roller frame vertically, positioning and assembling four equal outer ring plates by taking the column top as a reference, positioning and assembling the stiffening plates 3 on the upper side and the lower side of the outer ring by taking a round pipe installation reference line as a reference, marking out the central line and the outer contour line of the upper side of the steel wire rope, wherein the 8 stiffening plates 3 correspond to the central line and the outer contour line on the outer ring, checking and adjusting the welding side in the welding process by taking the hanging hammer line and the central line and the outer contour line on the ring plate as references, avoiding that the rigidity is too large and the anti-deformation force is insufficient after the filling of one side is too large, and finally ensuring that the 8 stiffening plates 3 are matched with the outer contour line 6; finally, welding seams between the stiffening plate 3 and the side of the ring plate are welded, and symmetrical welding is carried out;
step three, manufacturing a section II, marking an outer contour line and a positioning center line after welding and inspecting the circular plate 2 which is divided into four equal parts at the top of the column, marking the outer contour line of the pipe section on the circular plate 2 by taking an installation reference line as a reference, and marking the positioning center line of the stiffening plate 3 and the outer contour line corresponding to the circular ring; in the same step two, firstly welding 8 welding seams of the stiffening plate 3 and the column wall of the column to ensure that the stiffening plate 3 is matched with the outer contour line, and then welding the welding seams of the stiffening plate 3 and the side of the ring plate;
step four, closing the first segment and the second segment, aligning the stiffening plates 3 at the upper and lower segments as shown in fig. 4, and welding the rest welding seams;
manufacturing eight I-shaped variable cross-section conversion BH beam bodies 4, cutting steel plates in a blanking mode through 1), and scribing a folded plate line and an installation reference line; 2) checking a special oil press folded plate and an arc plate until the plate is qualified; 3) after the large special-shaped I-shaped is assembled, welding a welding seam of the body by using a trolley submerged-arc welding method; 4) assembling and welding the stiffening plates at the variable cross positions by taking the end parts as a reference, and checking and correcting to be qualified;
marking out a general assembly ground sample line with an umbrella-shaped conversion structure reversely arranged on the horizontal table, wherein the general assembly ground sample line comprises a steel pipe body outer contour projection ground sample line, a steel pipe outer ring plate outer contour projection ground sample line, a steel pipe stiffening plate center reference ground sample line, eight I-shaped conversion BH beam center reference ground sample lines, a II box type bracket center reference ground sample line, a II box type bracket 5 end face position ground sample line and a conversion structure integral outer contour projection ground sample line, as shown in fig. 6, the body part manufactured in the step 1 and the step five is hung on a horizontal table, the outer contour lines of the outer ring of the steel pipe and the outer contour lines 6 of the eight transition BH beams 4 are aligned in sequence, the misalignment of the joint between the column stiffener 3 and the web plate of the transition BH beam 4 is checked, after the adjustment is qualified, the end part of the conversion BH beam 4 is respectively positioned and fixed with the outer ring plate, the pipe column stiffening plate 3 and the jig frame by using a clamping plate;
seventhly, positioning and assembling the II box-type corbels 5 according to an installation datum line, and carrying out integral loading or bulk loading on the II box-type corbels 5 according to welding influences of different angles; performing a pre-welding ground sample report test, and fixing the angle and the port mouth shape of the II box type bracket 5 by using a temporary support after the test is qualified;
step eight, measuring the end point information of each branch by using a total station under the condition of integral assembly; detaching each branch, completing welding of the II box-type corbel 5, finally measuring the welded data of each branch by using a total station, and comparing and rechecking the data with the data during the whole installation; and (5) finding problems and adjusting in time.
Claims (5)
1. The manufacturing method of the umbrella-shaped conversion structure is characterized by comprising the following steps:
step one, manufacturing a single-section circular tube body: blanking and cutting the steel plate, and marking a central line of a circle and a circumferential bisector of radial 1/4; 2) the pressure head is pre-bent to enable the straight sections at the two ends of the steel plate to form an arc shape without protruding; 3) arranging a groove; 4) rounding and forming by a special plate bending machine; 5) longitudinal welding seam welding; 6) re-loading the plate rolling machine to return to the round shape, and correcting to be qualified;
step two, manufacturing a segment I, namely assembling an inner ring plate, an outer ring plate and stiffening plates by taking the column top as a reference, drawing out a central line and an outer contour line of the upper 8 stiffening plates corresponding to the outer ring, and checking and adjusting a welding side in a welding process by using a hammered line and the central line and the outer contour line on the ring plate as references, so that the situation that the rigidity is too large and the anti-deformation force is insufficient after the filling of one side is too large is avoided, and finally the 8 stiffening plates are ensured to be matched with the outer contour line; finally welding the welding seams of the stiffening plate and the ring plate side, and paying attention to symmetrical welding;
step three, manufacturing a section II, and marking out an outer contour line and a positioning center line after the circular ring plate which is divided into four parts at the top of the column is welded and inspected to be qualified; in the same step two, welding 8 welding seams of the stiffening plate and the column wall of the column to ensure that the stiffening plate is matched with the outer contour line, and then welding the welding seams of the stiffening plate and the side of the ring plate;
step four, closing the first segment and the second segment, aligning the stiffening plates at the upper and lower segments, and welding the rest welding seams;
manufacturing eight I-shaped variable cross-section conversion BH beam bodies, cutting steel plates in a blanking mode, and scribing a folded plate line and an installation reference line; 2) checking a special oil press folded plate and an arc plate until the plate is qualified; 3) after the large special-shaped I-shaped is assembled, welding a welding seam of the body by using a trolley submerged-arc welding method; 4) assembling and welding the stiffening plates at the variable cross positions by taking the end parts as a reference, and checking and correcting to be qualified;
drawing a general assembly ground sample line with an inverted umbrella-shaped conversion structure on a horizontal table, hanging the body part manufactured in the first step and the fifth step on the horizontal table, sequentially aligning the outer contour line of the outer ring of the steel pipe and the outer contour lines of eight conversion BH beams, checking the misalignment condition of the butt joint of the pipe column stiffening plate and the conversion BH beam web plate, and after the adjustment is qualified, positioning and fixing the end part of the conversion BH beam with an outer ring plate, the pipe column stiffening plate and a clamping plate for a jig frame respectively;
seventhly, positioning and assembling the II box-type corbels according to an installation datum line, and carrying out integral installation or bulk installation on the II box-type corbels according to welding influences of different angles; performing a pre-welding ground sample report test, and fixing the angle and the port mouth shape of the II box type bracket by using a temporary support after the II box type bracket is qualified;
step eight, measuring the end point information of each branch by using a total station under the condition of integral assembly; detaching each branch, completing II box type corbel welding, finally measuring the welded data of each branch by using a total station, and comparing and rechecking the data with the data during the whole installation; and (5) finding problems and adjusting in time.
2. The method of claim 1, wherein: in the second step, the inner ring plate which is divided into four parts is positioned, assembled and welded on the roller carrier; the lifting roller frame is vertically placed, the quartered outer ring plates are positioned and assembled by taking the column top as a reference, and the stiffening plates on the upper side and the lower side of the outer ring are positioned and assembled by taking the round pipe installation reference line as a reference.
3. The method of claim 1, wherein: and the thickness of the stiffening plate in the second step is 70-110 mm.
4. The method of claim 1, wherein: and in the third step, the outer contour line of the pipe section, the positioning center line of the stiffening plate and the outer contour line corresponding to the circular ring are marked on the circular ring plate by taking the installation datum line as a reference.
5. The method of claim 1, wherein: and in the sixth step, the assembly ground sample line comprises a steel pipe body outer contour projection ground sample line, a steel pipe outer ring plate outer contour projection ground sample line, a steel pipe stiffening plate center reference ground sample line, eight I-shaped conversion BH beam center reference ground sample lines, a II box-type bracket center reference ground sample line, a II box-type bracket end face position ground sample line and a conversion structure integral outer contour projection ground sample line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111631750.5A CN114319596A (en) | 2021-12-29 | 2021-12-29 | Manufacturing method of umbrella-shaped conversion structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111631750.5A CN114319596A (en) | 2021-12-29 | 2021-12-29 | Manufacturing method of umbrella-shaped conversion structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114319596A true CN114319596A (en) | 2022-04-12 |
Family
ID=81014485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111631750.5A Pending CN114319596A (en) | 2021-12-29 | 2021-12-29 | Manufacturing method of umbrella-shaped conversion structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114319596A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105382491A (en) * | 2015-11-26 | 2016-03-09 | 上海建工（江苏）钢结构有限公司 | Machining, manufacturing and inspection method of arc-shaped steel pipe column |
| CN107859177A (en) * | 2017-10-04 | 2018-03-30 | 中建钢构江苏有限公司 | Box complexity multi-angle intersects K-type connecting node and preparation method thereof |
| CN108517960A (en) * | 2018-05-11 | 2018-09-11 | 中建钢构江苏有限公司 | One type rice font cross over transition connecting node production method |
| CN109853741A (en) * | 2019-03-29 | 2019-06-07 | 同济大学建筑设计研究院(集团)有限公司 | A kind of core wall structure system with conversion layer |
| CN112359984A (en) * | 2020-11-27 | 2021-02-12 | 同济大学建筑设计研究院(集团)有限公司 | Umbrella-shaped steel structure conversion beam column node |
| CN112459249A (en) * | 2020-11-16 | 2021-03-09 | 上海市机械施工集团有限公司 | Construction method of steel structure of super high-rise transfer floor |
-
2021
- 2021-12-29 CN CN202111631750.5A patent/CN114319596A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105382491A (en) * | 2015-11-26 | 2016-03-09 | 上海建工（江苏）钢结构有限公司 | Machining, manufacturing and inspection method of arc-shaped steel pipe column |
| CN107859177A (en) * | 2017-10-04 | 2018-03-30 | 中建钢构江苏有限公司 | Box complexity multi-angle intersects K-type connecting node and preparation method thereof |
| CN108517960A (en) * | 2018-05-11 | 2018-09-11 | 中建钢构江苏有限公司 | One type rice font cross over transition connecting node production method |
| CN109853741A (en) * | 2019-03-29 | 2019-06-07 | 同济大学建筑设计研究院(集团)有限公司 | A kind of core wall structure system with conversion layer |
| CN112459249A (en) * | 2020-11-16 | 2021-03-09 | 上海市机械施工集团有限公司 | Construction method of steel structure of super high-rise transfer floor |
| CN112359984A (en) * | 2020-11-27 | 2021-02-12 | 同济大学建筑设计研究院(集团)有限公司 | Umbrella-shaped steel structure conversion beam column node |
Non-Patent Citations (1)
| Title |
|---|
| 张兵: "超高层转换钢结构高强超厚板焊接技术研究与应用", 《建筑技术》, vol. 52, no. 7, pages 828 - 831 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106351462B (en) | Temporary steel pipe support prestress reinforcing structure and construction method thereof | |
| CN110711961A (en) | Manufacturing method of cross-shaped variable box type node | |
| CN108103938A (en) | A kind of double deck module solid trial assembly method of large steel girder | |
| CN111350121A (en) | Modular assembling method for steel box girder bridge | |
| CN102848091A (en) | Ship double bottom block assembly welding technology | |
| CN106065664B (en) | Reusable connecting node and connecting method for movable roof truss and upright post | |
| CN108127310A (en) | Hydraulic cylinder body floor welding tooling and welding method | |
| CN108894580A (en) | A kind of building technology of flare tower | |
| CN114319596A (en) | Manufacturing method of umbrella-shaped conversion structure | |
| CN113634937A (en) | Brake disc partitioning and tailor-welding method | |
| CN102922096A (en) | On-site assembly welding method for large aluminum tower | |
| CN113148058A (en) | Process for installing and positioning double-rudder sleeve and tail casting in segmented construction stage | |
| CN201217135Y (en) | Whole interchanging quick fix tower section engaging eared plate welding fixture | |
| CN114799753B (en) | Manufacturing method of space special-shaped multi-curved-surface steel structure | |
| CN101323071B (en) | Complete interchanging quick fix tower section jacking eared plate welding fixture | |
| CN111604643B (en) | Manufacturing and mounting process of crane upright column for ship and ocean engineering | |
| CN113605532A (en) | Method for manufacturing ellipsoidal curved surface net rack steel template | |
| CN110480261A (en) | A kind of broken stone leveling ship spud leg building technology | |
| CN112360630A (en) | Hovercraft gas turbine hydraulic exhaust pipe cover and machining method thereof | |
| CN219565078U (en) | Connection structure | |
| CN102554559A (en) | Method for manufacturing ball node arc triangular gate of ship lock | |
| CN111156011A (en) | Improved device for preventing shield steel sleeve from deforming | |
| CN115431004B (en) | Welding method for inner flange of large-span U-shaped trestle | |
| CN110871328A (en) | Manufacturing process of ultra-large rail crane girder structure | |
| CN107268894A (en) | A kind of pair of pipe suspension column and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |