CN109208409A - Riding-type Monorail Switch beam and preparation method thereof - Google Patents
Riding-type Monorail Switch beam and preparation method thereof Download PDFInfo
- Publication number
- CN109208409A CN109208409A CN201710527870.8A CN201710527870A CN109208409A CN 109208409 A CN109208409 A CN 109208409A CN 201710527870 A CN201710527870 A CN 201710527870A CN 109208409 A CN109208409 A CN 109208409A
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- web
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- type single
- switch beam
- straddle type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/08—Tracks for mono-rails with centre of gravity of vehicle above the load-bearing rail
- E01B25/12—Switches; Crossings
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Railway Tracks (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
本发明公开了一种跨座式单轨道岔梁及其制作方法，所述跨座式单轨道岔梁包括：底板、行走板、左腹板和右腹板。行走板设在底板上方，且行走板与底板上下间隔；左腹板的上端与行走板相连、下端与底板相连；右腹板的上端与行走板相连、下端与底板相连，且左腹板和右腹板左右间隔，其中，左腹板和右腹板中至少一个腹板的端部的一侧连接有伸出端部的衬垫且端部的另一侧具有单边坡口。根据本发明实施例的跨座式单轨道岔梁，可极大降低焊接操作难度，同样显著降低焊缝根部出现未焊透及未熔合等焊接缺陷风险，提高焊接质量及生产效率。
The invention discloses a straddle-type single-track fork beam and a manufacturing method thereof. The straddle-type single-track fork beam comprises a bottom plate, a walking plate, a left web plate and a right web plate. The walking plate is arranged above the bottom plate, and the walking plate and the bottom plate are spaced up and down; the upper end of the left web plate is connected with the walking plate, and the lower end is connected with the bottom plate; the upper end of the right web plate is connected with the walking plate, and the lower end is connected with the bottom plate, and the left web plate is connected to the The right web is spaced from left to right, wherein one side of the end of at least one of the left web and the right web is connected with a gasket protruding from the end and the other side of the end has a single-sided bevel. According to the straddle type single-track fork beam according to the embodiment of the present invention, the difficulty of welding operation can be greatly reduced, and the risk of welding defects such as incomplete penetration and incomplete fusion at the root of the welding seam can also be significantly reduced, and the welding quality and production efficiency can be improved.
Description
Technical field
The present invention relates to railcar train technical field, in particular to a kind of Riding-type Monorail Switch beam and the straddle-type list
The production method of track turnout beam.
Background technique
Riding-type Monorail Switch is a kind of track switch of special construction, using being driven by electricity, realizes turnout junction girder entirety turn-out track, from
And turnout is formed with track girder or turnout junction girder contraposition, turn line needs with complete vehicle driving route.Turnout junction girder is track switch system
One of the load bearing component for core of uniting is typical box shape steel structure.Because of its important bearing behavior, weld seam class requirement is very high,
Postwelding need to carry out nondestructive inspection detection (RT or UT), and being commonly designed requirement is full penetration weld.To ensure that turnout junction girder main structure is welded
Seam reaches design penetration requirement, therefore its welding line joint form and assembly welding technique are particularly important.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
One purpose is to propose a kind of Riding-type Monorail Switch beam, and the welding of higher-strength may be implemented.
Riding-type Monorail Switch beam according to an embodiment of the present invention, comprising: bottom plate, walking plate, left web and right web.Institute
Walking plate is stated to be located above the bottom plate, and the walking plate and the bottom plate between the upper and lower every；The upper end of the left web and institute
State that walking plate is connected, lower end is connected with the bottom plate；The upper end of the right web is connected with the walking plate, lower end and the bottom
Plate is connected, and the left web and the right web are between left and right every, wherein at least one in the left web and the right web
The side of the end of web, which is connected with, stretches out the liner of the end and the other side of the end with bevel.
It is difficult can greatly to reduce welding operation only from unilateral welding for Riding-type Monorail Switch beam according to an embodiment of the present invention
There are the welding defects risks such as lack of penetration and incomplete fusion in degree, the same root of weld that significantly reduces, improve welding quality and production effect
Rate.By increasing back welding backing, it can effectively avoid and root burn-through phenomenon occur, and can suitably increase welding parameter, especially
It is bottom welding, to reduce the lack of penetration phenomenon of root incomplete fusion.
In addition, Riding-type Monorail Switch beam according to the above embodiment of the present invention, can also have following additional technology
Feature:
In one embodiment of the invention, the liner of the end of the web stretches out 2 millimeters of the end to 3 millis
Rice.
In one embodiment of the invention, range of the root face of the end of the web at 0 millimeter to 2 millimeters
It is interior.
In one embodiment of the invention, the tilt angle in the bevel face is in the range of 40 ° to 60 °.
In one embodiment of the invention, the liner is rectangular strip.
In one embodiment of the invention, the upper and lower end of the left web and the upper end of the right web
Portion and lower end all have the liner and the bevel.
In one embodiment of the invention, the outside setting of the liner and the web is arranged in the inside of the web
The bevel.
The invention also provides a kind of production method of Riding-type Monorail Switch beam, the Riding-type Monorail Switch beam is root
According to Riding-type Monorail Switch beam above-mentioned, the production method includes: that liner is first welded to the side of the end of the web
And liner is made to stretch out the end, then by web and liner spot-welded together and a welding in top plate and bottom plate.
In one embodiment of the invention, the welding includes being filled and cosmetic welding after first carrying out bottom welding
It connects, the electric current of bottom welding is less than the electric current of filling and cover welding, and the voltage of bottom welding is less than filling and cover welding
Voltage, the speed of bottom welding are greater than the speed of filling and cover welding.
In one embodiment of the invention, the electric current of bottom welding in the range of 170A to 200A, voltage arrives in 23V
In the range of 25V, speed of welding in the range of 19cm/min to 22cm/min, filling and the electric current of cover welding are arrived in 220A
In the range of 250A, voltage in the range of 26V to 28V, speed of welding in the range of 15cm/min to 18cm/min,
In one embodiment of the invention, mixed in 15L/min to 20L/min range using flow in welding process
Close gas shielded.
Detailed description of the invention
Fig. 1 is the schematic diagram of the Riding-type Monorail Switch beam of one embodiment of the invention.
Fig. 2 is the welding schematic diagram of Fig. 1 centre circle a-quadrant.
Fig. 3 is the web of one embodiment of the invention and the schematic diagram of cushion fit.
Appended drawing reference: Riding-type Monorail Switch beam 1, bottom plate 11, plate 12 of walking, left web 13, right web 14, liner 15,
Bevel 101, the length L1, the size L2 of the root face of the end of web, the tilt angle A1 in bevel face that liner plate stretches out.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Riding-type Monorail Switch beam is a kind of turnout junction girder of special construction, using being driven by electricity, realizes that turnout junction girder integrally turns
Rut turns line needs to form turnout with track girder or turnout junction girder contraposition with complete vehicle driving route.Turnout junction girder is
One of the load bearing component of the trouble beam system core is typical box shape steel structure.Because of its important bearing behavior, weld seam class requirement is non-
Chang Gao, postwelding need to carry out nondestructive inspection detection (RT or UT), and being commonly designed requirement is full penetration weld.To ensure the main knot of turnout junction girder
Structure weld seam reaches design penetration requirement, therefore its welding line joint form and assembly welding technique are particularly important.
For the welding manner of T junction, designer of the invention proposes a variety of welding schemes, such as: 1. do not open slope
Mouth 2. bevel, 3. bilateral symmetry groove.
Wherein, when opening bevel, bevel angle β=(35-60) °, root face c=(0-2) mm；Open bilateral symmetry groove
It is bevel angle β=(35-60) °, root face c=(0-2) mm.
Wherein the joint form is 1. planted, welded easy to operate but obviously uncomfortable for Riding-type Monorail Switch beam main structure
With, because it belongs to important strength weld and is thick plates, either from single side or two-sided welding all can not penetration, can not meet
Design strength requirement, admittedly it cannot use.
2. the plants joint form, easy to operate only from unilateral welding, and penetration welding furthermore can be achieved in design.But it is such
Joint form, higher to assembling and welding process requirement in actual production, fit-up gap is uneven if it exists, welding parameter is chosen
The reasons such as improper, welder's level of skill deficiency, the welding defects such as root burn-through all easy to form, lack of penetration, incomplete fusion.Therefore
If welding for turnout junction girder main structure, greater risk hidden danger will necessarily be brought to product quality.
3. the plants joint form, joint penetration welding may be implemented, but have the disadvantage that first, set inside turnout junction girder
There is reinforcement diaphragm plate, therefore inside welding operating space is relatively narrow, welding operation difficulty is higher；Second, turnout junction girder at present
Web thickness is usually in 12-16mm, the design of Bilateral Symmetry groove, and it is big to will lead to welding loading on the inside of web, welding passage compared with
It is more, therefore production efficiency can reduce and form failure welding defect risk height.
As can be seen that these above-mentioned welding schemes are being applied due to this body structure of Riding-type Monorail Switch beam
To when welding in Riding-type Monorail Switch beam, more or less there are some problems, it is difficult to meet Riding-type Monorail Switch beam
Welding.
In order to solve the Welding Problems of Riding-type Monorail Switch beam 1, the present invention provides a kind of new welding structures.
In conjunction with Fig. 1 to Fig. 3, Riding-type Monorail Switch beam 1 according to an embodiment of the present invention, comprising: bottom plate 11, walking plate
12, left web 13 and right web 14.
Specifically, walking plate 12 is located at the top of bottom plate 11, and walk plate 12 and bottom plate 11 between the upper and lower every.Left web 13
Upper end is connected with walking plate 12, and the lower end of left web 13 is connected with bottom plate 11.The upper end of left web 13 is connected with walking plate 12,
And the lower end of left web 13 is connected with bottom plate 11, and left web 13 and right web 14 between left and right every.
In left web 13 and right web 14 side of the end of at least one web be connected with projecting end liner 15 and
The other side has bevel 101.Wherein, the web is left web 13 and/or right web 14, and end is upper end
And/or lower end, the other side of end are that the other side of finger ends has the institute of groove and end with bevel 101
It states side and is not provided with groove.Wherein, the end of 14 stretching web of liner refers to liner 14 along up and down direction projecting end
Edge.
Specifically, including at least one of following technical solution and its combination:
The side of the upper end of left web 13 is equipped with liner 15, and pads 15 upper ends for stretching out left web 13 upwards, left
The other side of the upper end of web 13 is equipped with bevel 101；
The side of the lower end of left web 13 is equipped with liner 15, and pads 15 lower ends for extending downwardly left web 13, left
The other side of the lower end of web 13 is equipped with bevel 101；
The side of the upper end of right web 14 is equipped with liner 15, and pads 15 upper ends for stretching out right web 14 upwards, right
The other side of the upper end of web 14 is equipped with bevel 101；
The side of the lower end of right web 14 is equipped with liner 15, and pads 15 lower ends for extending downwardly right web 14, right
The other side of the lower end of web 14 is equipped with bevel 101.
It is difficult can greatly to reduce welding operation only from unilateral welding for Riding-type Monorail Switch beam 1 according to an embodiment of the present invention
There are the welding defects risks such as lack of penetration and incomplete fusion in degree, the same root of weld that significantly reduces, improve welding quality and production effect
Rate.By increasing back welding backing 15, it can effectively avoid and root burn-through phenomenon occur, and can suitably increase welding parameter, it is special
It is not bottom welding, to reduce the lack of penetration phenomenon of root incomplete fusion.
Preferably, the liner is arranged in the inside of web, and bevel is arranged in the outside of web.In other words, liner plate 15
It is located at the inside of web end, bevel 101 is formed in the outside of the end of web.It is of course also possible to will: liner plate 15 is located at
The outside of web end, bevel 101 are formed in the inside of the end of web.
In addition, the inner side and outer side be in contrast, be between left web 13 and right web 14 in, it is specific and
It says, the side of web 14 is the inside of left web 13 to the right above left web 13；Deviate from the side of right web 14 on left web 13
For the outer of left web 13；The side of web 13 is the inside of left web 13 to the left above right web 14；Away from a left side on right web 14
The side of web 13 is the outer of left web 13.In other words, the right side of left web 13 be in, left side be outer, the left side of right web 14
It is outer for interior, right side.
Such as Fig. 3, in one embodiment of the invention, 2 millimeters to 3 millimeters of 15 projecting end of liner of web end,
Middle Fig. 3 shows the length L1 of liner plate stretching.Weldering leading web and square steel bar reserve difference in height, it is ensured that when web assembles and walk
The fit-up gap of plate 12 and bottom plate 11 requires, and can equally significantly reduce the root of weld and the lack of penetration probability of incomplete fusion occurs, it is easier to
Obtain reliable quality weld connector.
Further, such as Fig. 3, the size L2 of the root face of the end of web is in the range of 0 millimeter to 2 millimeters, with into one
Improve the bonding strength of welding in step ground.
Preferably, such as Fig. 3, the tilt angle A1 in 101 face of bevel is in the range of 40 ° to 60 °.Web may be implemented
It effectively welds, improves the structural strength of entire Riding-type Monorail Switch beam 1.
Reference Fig. 2 and Fig. 3, further, liner 15 is rectangular strip.In the welding process, the lining of rectangular strip
Two surfaces on pad 15 can steadily connection web and walking plate 12 or web and bottom plate 11 respectively, further improve across
The structural strength and stability of type monorail turnout junction girder 1, but also the welded connecting effect of Riding-type Monorail Switch beam 1 can be improved
Rate.
In the welding process, liner 15 can be respectively welded on web and bottom plate 11, or liner 15 be respectively welded in
On web and walking plate 12.
Referring to Fig.1, in one embodiment of the invention, the upper and lower end of left web 13 and right web 14
Upper and lower end all has liner 15 and bevel 101.That is, the upper end of left web 13 and walking plate 12,
Upper end and walking plate 12, the lower end of left web 13 and bottom plate 11, the lower end of right web 14 and bottom plate 11 of right web 14
It is all made of welding manner above-mentioned, the structural strength and stability of entire Riding-type Monorail Switch beam 1 can be improved.
The Riding-type Monorail Switch beam 1 of a specific embodiment of the invention is described with reference to the accompanying drawings.
Such as Fig. 3, web uses 101 form of bevel, and 45 ° of bevel angle, root face 0-2mm increase in web medial surface
Square steel bar is added permanently to pad 15,
Such conceptual design compares common T-type welding point form, has following technical advantage:
1) joint form is 1. planted compared to aforementioned the, the welding of slab penetration can be achieved completely, guarantee meets design strength requirement；
2) 2. plant joint form compared to aforementioned the, operation is upper can be effectively reduced fit-up gap is required, welding parameter selection,
The dependence of the factors such as welder's gimmick stabilization.By increasing back welding backing 15, it can effectively avoid and root burn-through phenomenon occur, and
Welding parameter, especially bottom welding can suitably be increased, to reduce the lack of penetration phenomenon of root incomplete fusion.In addition weldering leading web with
Square steel bar reserves 2~3mm of difference in height, it is ensured that requires when web assembles with the fit-up gap for walking andante and bottom plate 11, equally may be used
It significantly reduces the root of weld and the lack of penetration probability of incomplete fusion occurs, to be easier to obtain reliable quality weld connector.
3) joint form is 3. planted compared to aforementioned the, only from unilateral welding, can greatly reduces welding operation difficulty, it is same significant
It reduces the root of weld and the welding defects risks such as lack of penetration and incomplete fusion occurs, improve welding quality and production efficiency.
The alternative existing common T connector form of the Novel T-shaped welding line joint form that the present invention designs, is primarily adapted for use in
The important bearing structure weld seam of design requirement full penetration, for example, it is existing it is various forms of singly open, three open, five switch nodal patterns or joint
The beam and trolley main structure web of 1 product of flexible type Riding-type Monorail Switch beam weld.
The innovative existing common T-type welding line joint form of change of the invention, bevel 101 is permanently padded with the back side
15 methods combined are welded for Riding-type Monorail Switch beam 1 nuclear structure web, reliable guarantee turnout beam main body
Structure welding quality.By 1 own structural characteristics of Riding-type Monorail Switch beam and the technique production order of combining closely, one kind is proposed
The design of Novel T-shaped melt-through weld joint form, not only can effectively ensure that welding quality, but also can reduce welding operation influence because
Element improves production welding first-time qualification rate.The technical solution belongs to optimization design on the basis of existing scheme, relatively primitive side
Case can be used for substituting existing 1 product important feature welding line joint form of Riding-type Monorail Switch beam, believe firmly there are larger improvement
One surely obtains larger application prospect in the following cross-saddle single-track traffic manufacture.
The invention also provides a kind of production method of Riding-type Monorail Switch beam 1, according to Riding-type Monorail Switch beam 1
Riding-type Monorail Switch beam 1 above-mentioned, production method include: first by liner 15 be welded to web end side and make to pad
15 projecting ends, then by web and liner 15 spot-welded together and a welding in top plate and bottom plate 11.
The production method of the single-track turnout beam of water flow of the present invention can greatly reduce welding operation difficulty only from unilateral welding,
There are the welding defects risks such as lack of penetration and incomplete fusion in the same root of weld that significantly reduces, improves welding quality and production efficiency.
By increasing back welding backing 15, it can effectively avoid and root burn-through phenomenon occur, and can suitably increase welding parameter, especially
Bottom welding, to reduce the lack of penetration phenomenon of root incomplete fusion.
In one embodiment of the invention, welding includes being filled and cover welding after first carrying out bottom welding, is beaten
The electric current that back welding connects is less than the electric current of filling and cover welding, and the voltage of bottom welding is less than the voltage of filling and cover welding,
The speed of bottom welding is greater than the speed of filling and cover welding.
In one embodiment of the invention, the electric current of bottom welding in the range of 170A to 200A, voltage arrives in 23V
In the range of 25V, speed of welding in the range of 19cm/min to 22cm/min, filling and the electric current of cover welding are arrived in 220A
In the range of 250A, voltage in the range of 26V to 28V, speed of welding in the range of 15cm/min to 18cm/min,
In one embodiment of the invention, mixed in 15L/min to 20L/min range using flow in welding process
Close gas shielded.
The Riding-type Monorail Switch beam 1 of a specific example of the invention is described below.
A, before the weldering of turnout junction girder main frame group, square steel bar is first padded into 15 spot welding and is fixed on web groove back side, in advance
Stay difference in height 2-3mm；
B, when web assembles, guarantee that square steel bar is close sturdy with top plate or bottom plate 11, when ensuring web welding between assembling
Gap is enough and uniform；
C, welding method is using manual consumable electrode metal active gas arc welding (Metal Active Gas Arc
Welding, i.e. MAG weldering): bottom welding electric current 170A-200A, weldingvoltage 23V-25V, speed of welding 19cm/min-22cm/
min；Filling and cover welding electric current 220A-250, weldingvoltage 26V-28V, speed of welding 15-18cm/min.In welding process
Using 80%Ar+20%CO2 mixing gas shielded, gas flow 15-20L/min.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art
For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (11)
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| CN110039210A (en) * | 2019-02-28 | 2019-07-23 | 武汉船用机械有限责任公司 | The welding method of cylindrical workpiece limiting tool |
| CN110181189A (en) * | 2019-06-27 | 2019-08-30 | 广船国际有限公司 | A kind of welding method of CM node groove |
| CN110465760A (en) * | 2019-08-29 | 2019-11-19 | 广船国际有限公司 | Welding method in hull small space |
| CN111702362A (en) * | 2020-05-25 | 2020-09-25 | 中国建筑第八工程局有限公司 | Welding method and welding structure of steel pipe column internal stiffening plate and bottom plate support |
| CN111980156A (en) * | 2020-09-25 | 2020-11-24 | 浙江金鑫钢结构集团有限公司 | Hinged connecting piece of large-scale steel structure and production process |
| CN112853826A (en) * | 2021-01-14 | 2021-05-28 | 中铁工程设计咨询集团有限公司 | Straddle type single-rail steel-concrete combined rail beam box type girder assembling method |
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| CN110039210A (en) * | 2019-02-28 | 2019-07-23 | 武汉船用机械有限责任公司 | The welding method of cylindrical workpiece limiting tool |
| CN110039210B (en) * | 2019-02-28 | 2021-08-31 | 武汉船用机械有限责任公司 | Welding method of limit tool for cylindrical workpiece |
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| CN110181189B (en) * | 2019-06-27 | 2021-04-02 | 广船国际有限公司 | Welding method of CM node groove |
| CN110465760A (en) * | 2019-08-29 | 2019-11-19 | 广船国际有限公司 | Welding method in hull small space |
| CN110465760B (en) * | 2019-08-29 | 2021-08-24 | 广船国际有限公司 | Welding method in narrow space of ship body |
| CN111702362A (en) * | 2020-05-25 | 2020-09-25 | 中国建筑第八工程局有限公司 | Welding method and welding structure of steel pipe column internal stiffening plate and bottom plate support |
| CN111980156A (en) * | 2020-09-25 | 2020-11-24 | 浙江金鑫钢结构集团有限公司 | Hinged connecting piece of large-scale steel structure and production process |
| CN112853826A (en) * | 2021-01-14 | 2021-05-28 | 中铁工程设计咨询集团有限公司 | Straddle type single-rail steel-concrete combined rail beam box type girder assembling method |
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