CN113770581A - Non-turnover welding method for steel arch box and non-turnover welded steel arch box - Google Patents
Non-turnover welding method for steel arch box and non-turnover welded steel arch box Download PDFInfo
- Publication number
- CN113770581A CN113770581A CN202111160740.8A CN202111160740A CN113770581A CN 113770581 A CN113770581 A CN 113770581A CN 202111160740 A CN202111160740 A CN 202111160740A CN 113770581 A CN113770581 A CN 113770581A
- Authority
- CN
- China
- Prior art keywords
- welding
- groove
- plate
- corner wall
- box
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The method for welding the steel arch box without overturning and the steel box arch without overturning welding comprise the following steps: formulating a scheme, designing a welding groove, testing a welding process, optimizing and perfecting the welding groove, assembling steel arch box welding and inspecting the welding groove. The invention realizes the welding manufacture of the steel box arch; meanwhile, the improved welding groove design is adopted, the overhead welding is changed into the overhead welding, and the technical problems that the turnover welding of the steel box arch is labor-consuming, time-consuming and labor-consuming, the safety risk is high, the site is limited and the equipment investment is overlarge are solved; the on-site non-turnover all-position welding operation of the steel box arch is realized, and the purposes of reducing cost and improving efficiency, reducing safety risk, reducing welding difficulty and improving welding quality are achieved.
Description
Technical Field
The invention belongs to the technical field of steel arch box manufacturing, and particularly relates to a non-turnover welding method for a steel arch box and a non-turnover welded steel arch box.
Background
Large steel box arch segments are generally constructed in an octagonal configuration from a top plate 1, a bottom plate 2, an outer web 3, an inner web 4, corner panels 5, and bulkheads 6 (see fig. 1). When the components are manufactured in a tailor welding mode, due to stress requirements, all corner welding seams of the components are required to be full penetration welding seams. Because the full penetration welding line has good force transmission effect, the welding requirement of the welding line is high, and the welding difficulty is high. Taking the steel box arch segment with the top plate and the bottom plate of 36-60mm thick and the corner wall plate 5 of 30-40mm thick as an example: the welding groove design is comparatively simple, only need the welding groove the direction towards the case outside can, can reach all welding seams and can bow the position welded requirement through upset steel case arch. Therefore, according to the conventional groove design method, the welding groove of the inner web 4 and the corner wall plate 5 (as shown in fig. 2 and 3) should be formed on the corner wall plate 5 of the thin plate. However, if the steel box arch is not welded in an overturning way, the welding seam at the position needs to be welded at the lower position (combining with the figure 1); (as shown in fig. 4 and 5), the welding seams of the top plate 1, the bottom plate 2 and the corner wall plate 5 also need to be welded at the upward position, the upward position is difficult to weld, the appearance of the welded welding seams is poor, the welding efficiency is low, a large amount of labor is occupied, and the welding quality cannot be guaranteed. Therefore, when the steel box arch segment is welded and manufactured, the overturning welding technology is adopted, and the main purpose of the overturning welding technology is to change an upward welding seam into a downward welding seam, so that the purposes of reducing the operation difficulty and ensuring the welding quality are achieved. In theory and practice, the horizontal or transverse welding technology adopted by the turnover welding technology has stable quality and high construction speed.
However, the existing overturning welding technology has high requirements on the hoisting capacity and the field area of a manufacturing field, and has large one-time investment and high safety risk. Large-scale steel case arch belongs to super large overweight component, if the upset operation, at first need have the hoisting equipment who satisfies the hoist and mount ability to and sufficient operation place, and will drop into a large amount of auxiliary personnel, the safety risk is big. From the actual construction, a large number of construction machines are only put into the welding operation of the components, the economy is not high, and certain safety management risks need to be borne. In view of this, the following technical solutions are proposed.
Disclosure of Invention
The technical problems solved by the invention are as follows: the steel arch box non-turnover welding method and the steel box arch without turnover welding are provided, and the steel box arch is welded without turnover; adopt improved generation welding groove design simultaneously, will face upward the position and weld and become the position of bowing and weld, solve steel case arch upset welding and take a lot of time and energy, the safe risk is big, the place is limited, the too big technical problem of equipment investment.
The technical scheme adopted by the invention is as follows: the steel arch box non-turnover welding method comprises the following steps:
s001, formulating a steel arch box welding scheme;
s002, analyzing the welding characteristics of different positions of the steel arch box, and designing a full-depression welding groove;
s003, performing a welding process test according to the designed full-depression welding groove;
s004, optimizing and perfecting the welding groove according to the test result;
s005, welding and assembling the steel arch box without overturning according to the optimized welding groove;
s006, inspecting the welding groove according to the steel arch box construction standard.
In the above technical solution, further: the welding groove in the step S005 includes a welding groove i of the outer web and the corner wall plate; welding grooves II of the upper end of the bottom plate, the upper end of the top plate and the corner wall plate; welding grooves III of the lower end of the bottom plate, the lower end of the top plate and the corner wall plate; welding grooves IV of the inner web plate and the corner wall plate; the welding groove I and the welding groove II are both single-side groove structures with outward groove directions; the welding groove III is of a double-sided K-shaped groove structure; the welding groove IV is a single-side groove structure with the inward groove direction, and a gasket is arranged on the outer side of the welding groove IV.
The steel box arch without the turnover welding manufactured by the steel arch box without the turnover welding method comprises a bottom plate and a top plate which are vertically arranged on the left side and the right side; the steel box arch also comprises an outer web plate horizontally arranged above and an inner web plate horizontally arranged below; the upper ends of the bottom plate and the top plate are respectively welded and fixedly connected with the left end and the right end of the outer web into a whole through corner wall plates; the lower ends of the bottom plate and the top plate are fixedly connected with the left end and the right end of the inner web plate into a whole through corner wall plates respectively; the outer web plate and the corner wall plate are provided with a welding seam I; welding seams II are respectively arranged at the upper end of the bottom plate, the upper end of the top plate and the corner wall plate; the weld joint I and the weld joint II are both single-side weld joint structures with outward groove directions; welding seams III are respectively formed between the lower end of the bottom plate and the lower end of the top plate and the corner wall plate; the welding seam III is a double-sided K-shaped welding seam structure; the inner web plate and the corner wall plate are provided with a welding seam IV; the welding line IV is a single-side welding line structure with the groove direction facing inwards, and a liner is arranged on the outer side of the welding line IV during welding.
In the above technical solution, further: the liner is a ceramic liner.
Compared with the prior art, the invention has the advantages that:
1. in the eight welding seams, the two welding seams of the inner web plate and the corner wall plate, and the two welding seams of the lower ends of the top plate and the bottom plate and the corner wall plate adopt special groove designs, and the other welding seams adopt conventional groove designs, so that all penetration welding seams which are originally required to be welded in the upward position are completely adjusted into the downward position welding; therefore, the on-site non-turnover all-position welding operation of the steel box arch is realized, and the purposes of reducing cost and improving efficiency, reducing safety risk, reducing welding difficulty and improving welding quality are achieved.
2. In the invention, the welding seam between the inner web plate and the corner wall plate is designed into a single-side groove form with an inward groove in consideration of welding convenience and easy machinability of a welding groove, and the purpose of forming two sides of a single-side welding is realized by customizing a special liner.
3. According to the invention, because the lower ends of the top plate and the bottom plate respectively have double-sided welding conditions with the corner wall plate, the welding seam form of the lower ends of the top plate and the bottom plate and the corner wall plate is designed into a double-sided K shape, and the welding seam which is originally required to be welded in the upward position is converted into horizontal position and transverse position welding, so that the welding operation difficulty is reduced, the welding efficiency is improved, and the welding quality is ensured.
4. According to the invention, the purposes of reducing the welding operation difficulty and improving the welding quality can be achieved only by designing the welding groove without additionally adding materials and auxiliary facilities.
5. The method is simple to operate, can improve the construction efficiency, reduces the equipment investment and reduces the safety risk.
6. The invention is convenient and easy to operate, has strong practicability, adopts small improvement and provides a better solution for the design of the non-turnover welding groove of the large steel box arch type component.
Drawings
FIG. 1 is a perspective view of a lower steel box arch of the prior art;
FIG. 2 is an enlarged detail structure schematic diagram of a lower steel box arch inner web and a corner wall plate before tailor welding in the prior art;
FIG. 3 is an enlarged detail view of a prior art lower steel box arch after welding of an inner web and a corner wall plate;
FIG. 4 is an enlarged detail structure schematic diagram of a prior art lower steel box arch top plate and a corner wall plate before tailor welding;
FIG. 5 is an enlarged detail view of a prior art lower steel box arch top panel and corner wall panel after welding;
FIG. 6 is a front view of the steel box arch of the present invention;
FIG. 7 is a schematic view of the structure of FIG. 6 showing the outer web A and the corner panel before they are welded together;
FIG. 8 is a schematic view of the welded part A of FIG. 6 according to the present invention;
FIG. 9 is a schematic view of the structure of the upper end of the top panel and the corner wall panel of the part B of FIG. 6 before welding;
FIG. 10 is a schematic view of the welded part B of FIG. 6 according to the present invention;
FIG. 11 is a schematic view of the structure of the lower end of the C-shaped top panel and the corner wall panel of FIG. 6 before welding;
FIG. 12 is a schematic view of the welded part C of FIG. 6 according to the present invention;
FIG. 13 is a schematic view of the structure of the D-section inner web and corner wall panel of FIG. 6 before welding;
FIG. 14 is a schematic view of the welded D portion of FIG. 6 according to the present invention;
FIG. 15 is a flow chart of a method of the present invention;
in the figure: 1-top plate, 2-bottom plate, 3-outer web plate, 4-inner web plate, 5-corner wall plate and 6-clapboard; 701-welding groove I, 702-welding groove II, 703-welding groove III, 704-welding groove IV and 705-gasket; 801-weld I, 802-weld II, 803-weld III, 804-weld IV.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 6 to 15 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
(as shown in fig. 6 and 15) the steel arch box non-overturning welding method comprises the following steps:
and S001, establishing a steel arch box welding scheme. The formulated welding scheme of the steel arch box comprises the following steps: firstly, welding and fixing the inner web plate 4 with the corner wall plates 5 at the left side and the right side respectively; then the lower ends of the top plate 1 and the bottom plate 2 are welded with the corner wall plate 5 into a whole; welding the partition plate 6 with the inner web plate 4, the lower end corner wall plate 5, the top plate 1 and the bottom plate 2; then the upper ends of the top plate 1 and the bottom plate 2 are welded with the corner wall plate 5 into a whole; and then the outer web 3 is respectively welded with the corner wall plates 5 at the left side and the right side, and finally welding seams of the partition plate 6, the corner wall plate 5 at the upper end and the outer web 3 are welded. All welding seams should be symmetrically welded on both sides simultaneously.
And S002, analyzing the welding characteristics of different positions of the steel arch box, and designing a full-depression welding groove. The purpose of the designed welding groove is to realize the non-turnover welding of the steel arch box.
And S003, performing a welding process test according to the designed full-depression welding groove. The welding process test is a test for detecting the capability of the metal material to be welded into a member with specified design requirements under limited construction conditions and meet the preset service requirements. The situation of the metal material after welding under certain process conditions can be known as follows: the possibility of cracking of the welded joint, i.e., good and bad crack resistance; the welding joint has reliability in use, including mechanical properties and other special properties of the joint: heat resistance, corrosion resistance, low temperature resistance, fatigue resistance, aging resistance and the like.
And S004, optimizing and perfecting the welding groove according to the test result. Such as determining the angle of the welding groove, the groove gap and the cross-sectional area of the weld.
And S005, welding and assembling the steel arch box without overturning according to the optimized welding groove. (see fig. 6) the steel arch box is assembled by tailor welding according to the welding scheme of step S001.
In the above embodiment, further: the welding groove in step S005 includes a welding groove i 701 of the outer web 3 and the corner wall plate 5. The welding groove I701 is a groove with an outward included angle of 60 degrees. (see fig. 7) further comprises a welding groove ii 702 (see fig. 9) of the upper end of the bottom plate 2, the upper end of the top plate 1 and the corner wall plate 5. And the welding groove II 702 is of a groove structure with an outward included angle of 58 degrees. The welding groove I701 and the welding groove II 702 are both single-side groove structures with outward groove directions. Thus, the outer web 3 and the corner wall plate 5, and the upper end of the bottom plate 2 and the upper end of the top plate 1 are welded to the corner wall plate 5 in a depression position.
(see fig. 11) further includes a welding groove iii 703 for the lower end of the bottom plate 2, the lower end of the top plate 1 and the corner wall plate 5. The welding groove III 703 is a double-sided K-shaped groove structure. The included angle of the double-sided K-shaped groove of the welding groove III 703 is 45 degrees, so that the requirements of double-sided welding are met, and the requirements of structural rigidity and structural strength are met.
And (as shown in figure 13) welding grooves IV 704 of the inner web plate 4 and the corner wall plate 5. The welding groove IV 704 is of a single-side groove structure with an inward groove direction, and a gasket 705 is arranged on the outer side of the welding groove IV 704. Wherein the included angle of the welding groove IV 704 is 50 degrees. The liner 705 is a ceramic liner. The shape of the pad 705 is shown in fig. 13. The middle part of the liner 705 is provided with an arc-shaped groove which is matched with the groove central line of the welding groove IV 704.
S006, inspecting the welding groove according to the steel arch box construction standard. The steel arch box construction standard is as follows: highway bridge and culvert construction technical specification (JTG/T F50-2011) and steel structure welding specification (GB 50661-2011).
The invention also discloses a non-turnover welded steel box arch manufactured by the non-turnover welding method of the steel arch box.
(as shown in fig. 6) the steel box arch comprises a bottom plate 2 and a top plate 1 which are vertically arranged at the left side and the right side. The left side is taken as a bottom plate 2 and the right side is taken as a top plate 1. The steel box arch further comprises an outer web plate 3 horizontally arranged above and an inner web plate 4 horizontally arranged below.
The upper ends of the bottom plate 2 and the top plate 1 are fixedly connected with the left end and the right end of the outer web 3 into a whole through corner wall plates 5. The lower ends of the bottom plate 2 and the top plate 1 are fixedly connected with the left end and the right end of the inner web plate 4 into a whole through the corner wall plate 5.
The outer web 3 and the corner wall 5 have a weld i 801. (see fig. 8) the upper end of the bottom panel 2, the upper end of the top panel 1 and the corner wall panel 5 are provided with welds ii 802 (see fig. 10). And the welding seam I801 and the welding seam II 802 are both single-side welding seam structures with outward groove directions. The welding seam structure adopts the traditional method for welding, and the depression welding operation can be realized.
The lower ends of the bottom plate 2 and the top plate 1 and the corner wall plate 5 are respectively provided with a welding seam III 803; the welding seam III 803 is a double-sided K-shaped welding seam structure. And welding by adopting a double-sided K-shaped welding seam structure. According to the invention, as the lower ends of the top plate 1 and the bottom plate 2 shown in fig. 6 respectively have double-sided welding conditions with the corner wall plate 5, the welding seam form between the lower ends of the top plate and the bottom plate and the corner wall plate 5 is designed into a double-sided K shape, and the welding seam which is originally required to be welded in the upward position is converted into horizontal position and horizontal position welding, so that the welding operation difficulty is reduced, the welding efficiency is improved, and the welding quality is ensured.
(as shown in figure 14) the inner web 4 and corner wall panel 5 have a weld iv 804; the welding line IV 804 is a single-side welding line structure with an inward groove, and when the welding line IV 804 is welded, a gasket 705 is arranged on the outer side of the groove of the welding line IV 804. In the above embodiment, further: the liner 705 is a ceramic liner. In the invention, the welding line IV 804 between the inner web plate 4 and the corner wall plate 5 is designed into a single-side groove form with an inward groove in consideration of welding convenience and easy machinability of a welding groove, and the purpose of single-side welding and double-side forming is realized by customizing a special liner.
In the eight welding seams, two welding seams of the inner web plate 4 and the corner wall plate 5 and two welding seams of the lower ends of the top plate 1 and the bottom plate 2 and the corner wall plate 5 adopt special groove designs, and the other welding seams adopt conventional groove designs, so that all the full penetration welding seams which are originally required to be welded in the upward position are adjusted into the downward position welding; therefore, the on-site non-turnover all-position welding operation of the steel box arch is realized, and the purposes of reducing cost and improving efficiency, reducing safety risk, reducing welding difficulty and improving welding quality are achieved.
The working principle of the invention is as follows: when the manufacturing scheme of the steel box arch is adopted, the welding seams between the left end and the right end of the inner web plate 4 and the corner wall plate 5 are designed into a single-side groove form in consideration of welding convenience and easy processability, and the purpose of single-side welding and double-side forming is achieved by customizing the special liner 705. And the lower ends of the top plate and the bottom plate and the corner wall plate 5 have double-sided welding conditions, so that the welding seam form of the lower ends of the top plate and the bottom plate and the corner wall plate 5 is designed to be a double-sided K type: the two grooves have the greatest advantages that the welding seam which needs to be welded at the upward position originally is converted into horizontal position and transverse position welding, the welding operation difficulty is reduced, the welding efficiency is improved, and the technical problem that the full penetration welding seam of the original inner web plate and the original corner wall plate, and the top plate, the bottom plate and the corner wall plate needs to be welded at the upward position is solved.
In conclusion, the invention can achieve the purposes of reducing the welding operation difficulty and improving the welding quality only by designing the welding groove without additionally adding materials and auxiliary facilities. The method is simple to operate, can improve the construction efficiency, reduces the equipment investment and reduces the safety risk. The invention is convenient and easy to implement, has strong applicability, adopts small improvement and provides a better solution for the design of the non-turnover welding groove of the large steel box arch type component.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. The steel arch box non-turnover welding method is characterized by comprising the following steps of:
s001, formulating a steel arch box welding scheme;
s002, analyzing the welding characteristics of different positions of the steel arch box, and designing a full-depression welding groove;
s003, performing a welding process test according to the designed full-depression welding groove;
s004, optimizing and perfecting the welding groove according to the test result;
s005, welding and assembling the steel arch box without overturning according to the optimized welding groove;
s006, inspecting the welding groove according to the steel arch box construction standard.
2. The steel arch box non-turnover welding method as claimed in claim 1, wherein: the welding groove in the step S005 includes a welding groove i (701) of the outer web (3) and the corner wall plate (5); the upper end of the bottom plate (2), the upper end of the top plate (1) and a welding groove II (702) of the corner wall plate (5); the lower end of the bottom plate (2), the lower end of the top plate (1) and a welding groove III (703) of the corner wall plate (5); a welding groove IV (704) of the inner web plate (4) and the corner wall plate (5); the welding groove I (701) and the welding groove II (702) are both single-side groove structures with outward groove directions; the welding groove III (703) is of a double-sided K-shaped groove structure; the welding groove IV (704) is of a single-side groove structure with an inward groove direction, and a gasket (705) is arranged on the outer side of the welding groove IV (704).
3. The steel arch without flip welding manufactured by the steel arch box without flip welding method according to claim 1 or 2, characterized in that: the steel box arch comprises a bottom plate (2) and a top plate (1) which are vertically arranged on the left side and the right side; the steel box arch also comprises an outer web plate (3) horizontally arranged above and an inner web plate (4) horizontally arranged below; the upper ends of the bottom plate (2) and the top plate (1) are fixedly connected with the left end and the right end of the outer web plate (3) into a whole through corner wall plates (5) respectively; the lower ends of the bottom plate (2) and the top plate (1) are fixedly connected with the left end and the right end of the inner web plate (4) into a whole through corner wall plates (5) respectively in a welding manner; the outer web (3) and the corner wall plate (5) are provided with a welding seam I (801); the upper end of the bottom plate (2), the upper end of the top plate (1) and the corner wall plate (5) are respectively provided with a welding seam II (802); the welding seam I (801) and the welding seam II (802) are both single-side welding seam structures with outward groove directions; the lower end of the bottom plate (2) and the lower end of the top plate (1) are respectively provided with a welding seam III (803) with the corner wall plate (5); the welding seam III (803) is a double-sided K-shaped welding seam structure; the inner web plate (4) and the corner wall plate (5) are provided with a welding seam IV (804); the welding line IV (804) is of a single-side welding line structure with an inward groove, and a gasket (705) is arranged on the outer side of the welding line IV (804) during welding.
4. The non-flip welded steel box arch of claim 3, wherein: the liner (705) is a ceramic liner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111160740.8A CN113770581A (en) | 2021-09-30 | 2021-09-30 | Non-turnover welding method for steel arch box and non-turnover welded steel arch box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111160740.8A CN113770581A (en) | 2021-09-30 | 2021-09-30 | Non-turnover welding method for steel arch box and non-turnover welded steel arch box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113770581A true CN113770581A (en) | 2021-12-10 |
Family
ID=78854871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111160740.8A Pending CN113770581A (en) | 2021-09-30 | 2021-09-30 | Non-turnover welding method for steel arch box and non-turnover welded steel arch box |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113770581A (en) |
-
2021
- 2021-09-30 CN CN202111160740.8A patent/CN113770581A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207160233U (en) | The unilateral connecting node of repair type beam-column and steel building after shake | |
| CN107355002A (en) | The unilateral connecting node of repair type beam-column and steel building after shake | |
| CN108517960A (en) | One type rice font cross over transition connecting node production method | |
| CN111663429A (en) | Manufacturing method of butterfly-shaped connecting node component | |
| CN208293763U (en) | The board-like beam-to-column joint device of outer ring | |
| CN107083807A (en) | A kind of endplate connections node | |
| CN103406674B (en) | Method for manufacturing and welding wave web box type section beam and diaphragms | |
| CN107938508A (en) | A kind of HRP Orthotropic Steel Bridge Decks structure | |
| CN104743056A (en) | Method for lifting ship aluminum alloy segments | |
| CN113770581A (en) | Non-turnover welding method for steel arch box and non-turnover welded steel arch box | |
| CN215999183U (en) | Non-turnover welded steel box arch | |
| CN206598890U (en) | A kind of new diagonal brace connection component of urban bus vehicle body aluminium skeleton | |
| CN209779448U (en) | Full-automatic welding high-fatigue-resistance orthotropic steel bridge deck | |
| CN209457263U (en) | A kind of assembling type steel structure beam slab connecting structure | |
| CN207260341U (en) | Unilateral buckling-restrained formula girder steel column connected node and steel building | |
| CN208748823U (en) | The connecting joint structure of core space heavier-duty circular steel tube concrete column and reinforced beam | |
| CN109339130A (en) | A kind of reverse shovel grab swing arm | |
| CN106012871B (en) | The coaming plate reinforcement of steel case bridge tower oblong manhole | |
| US20170175434A1 (en) | Curved Cross-Section Wind Turbine Tower and Wind Turbine Comprising Said Tower | |
| CN208815686U (en) | The connecting joint structure of core space heavier-duty circular steel tube concrete column and girder steel | |
| CN106988420A (en) | A kind of assembled connecting node | |
| CN106948262A (en) | A kind of Orthotropic Steel Bridge Deck structure with horizontal binder | |
| CN209760598U (en) | Light sandwich concrete steel bar angle steel truss column structure | |
| CN206707125U (en) | Multilayer steel core concrete column inside and outside a kind of lattice | |
| CN207712058U (en) | A kind of end wall structure of straddle-type single-track vehicle |
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 |