CN111730182A - Resistance welding equipment for internal stiffening ribs of double-steel-plate shear wall and welding method thereof - Google Patents
Resistance welding equipment for internal stiffening ribs of double-steel-plate shear wall and welding method thereof Download PDFInfo
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- CN111730182A CN111730182A CN202010529297.6A CN202010529297A CN111730182A CN 111730182 A CN111730182 A CN 111730182A CN 202010529297 A CN202010529297 A CN 202010529297A CN 111730182 A CN111730182 A CN 111730182A
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- 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
- B23K11/00—Resistance welding; Severing by resistance heating
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- 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
- B23K11/00—Resistance welding; Severing by resistance heating
- B23K11/36—Auxiliary equipment
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Abstract
The invention relates to electric resistance welding equipment for stiffening ribs in a double-steel-plate shear wall, which comprises: a bracket supported at the outer steel plate; a pressurizing mechanism which is arranged on the bracket and corresponds to the surface of the outer steel plate; the first electrode is connected with the pressurizing mechanism and is driven to be pressed against the surface of the outer steel plate by the pressurizing mechanism; the connecting rod is connected to the support, arranged along the arrangement direction of the stiffening rib and bent at the end parts of the outer steel plates and the stiffening rib so as to extend into the space between the pair of outer steel plates, and the end part of the connecting rod extends to the other end parts of the outer steel plates and the stiffening rib; and the second electrode is arranged at the end part of the connecting rod, is opposite to the first electrode and is abutted against the surface of the stiffening rib, and then the first electrode and the second electrode clamp the corresponding part of the outer steel plate and the stiffening rib to perform welding operation. The application has solved current electric welding equipment and can't go deep into a pair of outer steel sheet inboard and carry out the welded problem to the stiffening rib.
Description
Technical Field
The invention relates to the technical field of electric resistance welding equipment, in particular to electric resistance welding equipment for stiffening ribs inside a double-steel-plate shear wall and a welding method thereof.
Background
The double-steel-plate shear wall comprises a pair of parallel outer steel plates, a stiffening rib arranged between the pair of outer steel plates and steel pipes arranged at two ends of the two outer steel plates. Because the stiffening rib needs to weld with a pair of outer steel sheet inboards, and two steel sheet shear force walls are highly big, and current electric welding equipment can't go deep into one and weld the stiffening rib in to outer steel sheet, consequently current two steel sheet shear force walls form through polylith C shaped steel and H shaped steel concatenation welding usually, but the construction welding is comparatively complicated like this.
Therefore, it is desirable to provide an electric resistance welding apparatus for internal stiffeners of a dual-steel plate shear wall and a welding method thereof, which can weld stiffeners in a pair of external steel plates to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides electric resistance welding equipment for internal stiffening ribs of a double-steel-plate shear wall and a welding method thereof, so as to solve the problem that the existing electric resistance welding equipment cannot penetrate into the inner sides of a pair of outer steel plates to weld the stiffening ribs.
In order to achieve the above object, the present invention provides an electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall, comprising:
a bracket supported at the outer steel plate;
the pressurizing mechanism is arranged on the bracket and corresponds to the surface of the outer steel plate;
the first electrode is connected with the pressurizing mechanism and is driven to be pressed against the surface of the outer steel plate by the pressurizing mechanism;
the connecting rod is connected to the support, arranged along the arrangement direction of the stiffening rib and bent at the end parts of the outer steel plates and the stiffening rib so as to extend into the space between the pair of outer steel plates, and the end part of the connecting rod extends to the other end parts of the outer steel plates and the stiffening rib; and
and the second electrode is arranged at the end part of the connecting rod, is opposite to the first electrode and is abutted against the surface of the stiffening rib, and then clamps the part of the outer steel plate corresponding to the stiffening rib through the first electrode and the second electrode to perform welding operation.
The invention relates to a welding device, which comprises a support, a first electrode, a second electrode, a pressurizing mechanism, a connecting rod, a first electrode, a second electrode, a pair of stiffening ribs, a first electrode, a second electrode, a connecting rod, a first electrode, a second electrode, a connecting rod, a pressurizing mechanism and a welding rod.
The resistance welding equipment for the stiffening ribs in the double-steel-plate shear wall is further improved in that the length of the second electrode is adjustable, and the end part of the second electrode is pressed against the part to be welded of the stiffening ribs by adjusting the length of the second electrode.
The invention is further improved in that the connecting rod comprises a first connecting rod, a second connecting rod vertically connected with the first connecting rod and a third connecting rod vertically connected with the second connecting rod;
the third connecting rod is parallel to the first connecting rod, and the length of the first connecting rod and the length of the third connecting rod are greater than the length of the stiffening rib and the length of the outer steel plate.
The invention further provides resistance welding equipment for stiffening ribs in a double-steel-plate shear wall, which is further improved in that rollers are arranged at the bottom of the support, and the support is moved along the arrangement direction of the stiffening ribs through the rollers, so that the first electrode and the second electrode can be driven to move to the welding position.
The invention is further improved in that the support comprises a support rod arranged along the width direction of the outer steel plate and vertical rods vertically connected to two ends of the support rod;
the length of the supporting rod is greater than the width of the outer steel plate;
the bottom of the upright stanchion is connected with the roller.
The resistance welding equipment for the stiffening ribs in the double-steel-plate shear wall is further improved in that a plurality of pressurizing mechanisms, a plurality of first electrodes, a plurality of connecting rods and a plurality of second electrodes are arranged on the support rod, so that the plurality of stiffening ribs can be welded by the plurality of first electrodes and the plurality of second electrodes synchronously.
The invention also provides a welding method of the electric resistance welding equipment for the stiffening ribs in the double-steel-plate shear wall, which comprises the following steps:
providing a pair of outer steel plates and a plurality of stiffening ribs, and laying the stiffening ribs between the pair of outer steel plates at intervals;
the bracket is supported at the outer steel plate, the first electrode and the second electrode are positioned at the end parts of the outer steel plate and the stiffening rib by moving the bracket, the first electrode is arranged corresponding to the surface of the outer steel plate, and the second electrode is correspondingly pressed against the surface of the stiffening rib;
driving the first electrode to abut against the surface of the outer steel plate by using the pressurizing mechanism, and further clamping the part, corresponding to the stiffening rib, of the outer steel plate by using the first electrode and the second electrode and performing welding operation;
and moving the support and carrying the first electrode and the second electrode to the next welding position through the support to perform welding operation, and repeating the step until the welding of the stiffening rib and the outer steel plate is completed.
The invention is further improved in the welding method of the electric resistance welding equipment for the stiffening ribs in the double-steel-plate shear wall, and the welding method also comprises the following steps:
and when the support is moved, moving the support along the arrangement direction of the stiffening ribs.
The invention is further improved in the welding method of the electric resistance welding equipment for the stiffening ribs in the double-steel-plate shear wall, wherein the length of the second electrode is adjustable, and the welding method further comprises the following steps:
after the second electrode extends into the space between the pair of outer steel plates, the length of the second electrode is adjusted, so that the end part of the second electrode is pressed against the part corresponding to the stiffening rib.
The invention is further improved in the welding method of the electric resistance welding equipment for the stiffening ribs in the double-steel-plate shear wall, and the welding method also comprises the following steps:
and after the plurality of stiffening ribs are laid between the pair of outer steel plates at intervals, the end parts of the stiffening ribs are fixedly connected with the end parts of the pair of outer steel plates.
Drawings
FIG. 1 is a front view of an electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to the present invention, when welding stiffeners.
FIG. 2 is a side view of the stiffening ribs welded by the electric resistance welding equipment for stiffening ribs inside a double-steel-plate shear wall according to the invention.
FIG. 3 is a cross-sectional view of a column of the electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall of the present invention.
Fig. 4 is a schematic structural diagram of the double-steel-plate shear wall of the invention.
Reference numerals: the device comprises a support-1, a pressurizing mechanism-2, a first electrode-3, a second electrode-4, a base-5, a connecting rod-6, a first connecting rod-61, a second connecting rod-62, a third connecting rod-63, a stand column-64, a shell-7, a stiffening cable-8, an outer steel plate-91 and a stiffening rib-92.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides electric resistance welding equipment for stiffening ribs inside a double-steel-plate shear wall, which is used for welding and fixing the stiffening ribs between a pair of outer steel plates of the double-steel-plate shear wall and comprises a bracket, a pressurizing mechanism, a first electrode, a connecting rod and a second electrode, the pressure mechanism is arranged on the bracket corresponding to the surface of the outer steel plate and is connected with the first electrode, the second electrode is connected with the bracket through the connecting rod, the bracket is arranged in a bent shape so as to drive the second electrode to extend into the space between the outer steel plates, the first electrode is driven by the pressurizing mechanism to press against the surface of the outer steel plate, so that the first electrode and the second electrode clamp the corresponding part of the outer steel plate and the stiffening rib and perform welding operation, thereby realizing the welding fixation of the stiffening rib on the outer steel plate, thereby solved current electric welding equipment and can't go deep into a pair of outer steel sheet inboard and carry out the welded problem to the stiffening rib.
The electric resistance welding equipment for the internal stiffening ribs of the double-steel-plate shear wall is described below with reference to the attached drawings.
Referring to fig. 1, there is shown a front view of the electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to the present invention, when welding stiffeners. In this embodiment, an electric resistance welding apparatus for a double steel plate shear wall internal stiffener includes: the welding device comprises a support 1 supported at the outer steel plate 91, a pressurizing mechanism 2 arranged on the support 1 and corresponding to the surface of the outer steel plate 91, a first electrode 3 connected with the pressurizing mechanism 2, a connecting rod 6 connected with the support 1 and a second electrode 4 arranged at the end part of the connecting rod 6, wherein the first electrode 3 is driven by the pressurizing mechanism 2 to be pressed against the surface of the outer steel plate 91, the connecting rod 6 is arranged along the arrangement direction of a stiffening rib 92 and is bent at the end parts of the outer steel plate 91 and the stiffening rib 92 so as to extend between a pair of outer steel plates 91, the end part of the connecting rod 6 extends to the other end parts of the outer steel plate 91 and the stiffening rib 92, the second electrode 4 is arranged opposite to the first electrode 3 and is pressed against the surface of the stiffening rib 92, and the part of the outer steel plate 91 corresponding to the stiffening rib 92 is clamped by the first electrode 3 and the second electrode 4 so as to perform welding operation.
In the embodiment, a pressurizing mechanism 2 corresponding to the surface of the outer steel plate 91 is installed on the bracket 1, the pressurizing mechanism 2 is connected with a first electrode 3, a second electrode 4 is connected with the bracket 1 through a connecting rod 6, the bracket 1 is arranged in a bent shape so as to bring the second electrode 4 to extend into between a pair of outer steel plates 91, the first electrode 3 is driven by the pressurizing mechanism 2 to press against the surface of the outer steel plate 91, so that the first electrode 3 and the second electrode 4 clamp the outer steel plate 91 and the part corresponding to the stiffening rib 92, the first electrode 3 and the second electrode 4 are electrified, under the action of resistance heat, the parts to be welded corresponding to the first electrode 3 and the second electrode 4 are melted, the corresponding parts are fixedly connected after cooling, and welding operation can be carried out on a plurality of welding positions on the outer steel plate 91 and the stiffening rib 92 by moving the bracket 1, so as to realize that the stiffening rib 92 is welded and fixed on the outer steel plate 91, thereby solving the problem that the existing electric welding equipment can not go deep into the inner side of the outer steel plate 91 to weld the stiffening rib 92.
Referring to fig. 1, further, the length of the second electrode 4 is adjustable to accommodate stiffeners 92 of different sizes, and the length of the second electrode 4 is adjusted to press the end of the second electrode 4 against the to-be-welded portion of the stiffener 92.
Referring to fig. 1 and 2, in the present embodiment, one end of the second electrode 4 far from the first electrode 3 is screwed with the base 5, and the end of the second electrode 4 is pressed against the to-be-welded portion of the stiffener 92 by adjusting the height of the second electrode 4 extending out of the base 5 to fit the stiffener 92.
Referring to fig. 2, further, the connecting link 6 includes a first link 61, a second link 62 perpendicularly connected to the first link 61, and a third link 63 perpendicularly connected to the second link 62, the third link 63 being parallel to the first link 61, and the lengths of the first link 61 and the third link 63 being greater than the lengths of the stiffening rib 92 and the outer steel plate 91.
Specifically, the first connecting rod 61 is fixedly connected with the support 1, and the third connecting rod 63 is fixedly connected with the second electrode 4.
Preferably, resistance welding equipment still includes and places in the stand 64 on ground corresponding third connecting rod 63, the top of stand 64 is equipped with the recess that supplies to wear to put third connecting rod 63, on the one hand, stand 64 plays the effect of support to connecting rod 6, on the other hand, the pole setting plays spacing effect to connecting rod 6, in the in-process that removes support 1, avoid rocking of connecting rod 6, because a plurality of welding position on stiffening rib 92 and the outer steel sheet 91 is generally laid for the linear type, the setting of stand 64 guarantees that connecting rod 6 moves along welding position's direction of setting all the time, be convenient for first electrode 3 and second electrode 4 adjust to corresponding welding position in order, avoided shaking the problem of the great and loaded down with trivial details adjustment position of deviation of first electrode 3 and second electrode 4 and welding position because of connecting rod 6 and cause.
Referring to fig. 2, specifically, the connecting rod 6 is U-shaped, and the connecting rod 6 is hollow and has a wire passing through it.
In one embodiment, the bottom of the frame 1 is provided with rollers, and the frame 1 is moved in the direction of the stiffener 92 by the rollers, thereby moving the first electrode 3 and the second electrode 4 to the welding position.
Further, support 1 includes the branch that sets up along the width direction of outer steel sheet 91 and connects perpendicularly in the pole setting at branch both ends, and the length of branch is greater than outer steel sheet 91's width, and the bottom of pole setting is connected with the gyro wheel.
Further, the strut 1 is provided with a plurality of pressing mechanisms 2, a plurality of first electrodes 3, a plurality of connecting rods 6, and a plurality of second electrodes 4, so that the plurality of first electrodes 3 and the plurality of second electrodes 4 can perform welding work on the plurality of stiffening ribs 92 in synchronization.
Referring to fig. 1, specifically, the resistance welding apparatus further includes a housing 7 disposed on the support 1, a transformer and a controller are disposed in the housing 7, and the first electrode 3, the transformer, the controller, and the second electrode 4 are connected to form a welding loop.
Referring to fig. 2, preferably, the resistance welding apparatus further includes a stiffening cable 8, one end of the stiffening cable 8 is fixedly connected to the end of the connecting rod 6 far from the second electrode 4, and the other end is fixedly connected to the housing 7.
The invention also provides a welding method of the electric resistance welding equipment for the stiffening rib 92 in the double-steel-plate shear wall, which comprises the following steps:
a pair of outer steel plates 91 and a plurality of stiffeners 92 are provided, and the plurality of stiffeners 92 are laid between the pair of outer steel plates 91 at intervals.
The bracket 1 is supported on the outer steel plate 91, the first electrode 3 and the second electrode 4 are located at the end parts of the outer steel plate 91 and the stiffening rib 92 by moving the bracket 1, the first electrode 3 is arranged corresponding to the surface of the outer steel plate 91, and the second electrode 4 is correspondingly pressed against the surface of the stiffening rib 92.
The first electrode 3 is driven by the pressing mechanism 2 to press the surface of the outer steel plate 91, and the first electrode 3 and the second electrode 4 are used to clamp the portion of the outer steel plate 91 corresponding to the stiffening rib 92 and perform welding operation.
The welding operation is performed by moving the carriage 1 and carrying the first electrode 3 and the second electrode 4 by the carriage 1 to the next welding position, and the step is repeated until the welding of the stiffener 92 to the outer steel plate 91 is completed.
Further, the welding method further comprises the following steps:
when the carrier 1 is moved, the carrier 1 is moved in the direction in which the stiffener 92 is provided.
Furthermore, the length of the second electrode 4 is adjustable, and the welding method further comprises the following steps:
after the second electrode 4 is inserted between the pair of outer steel plates 91, the length of the second electrode 4 is adjusted so that the end of the second electrode 4 is pressed against the corresponding portion of the stiffener 92.
Further, the welding method further comprises the following steps:
after the plurality of reinforcing ribs 92 are laid between the pair of outer steel plates 91 at intervals, the end portions of the reinforcing ribs 92 are fixedly connected to the end portions of the pair of outer steel plates 91.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention is characterized in that a pressurizing mechanism arranged corresponding to the surface of the outer steel plate is arranged on the bracket, the pressurizing mechanism is connected with a first electrode, a second electrode is connected with the bracket through a connecting rod, the bracket is arranged in a bent shape so as to drive the second electrode to extend into the space between a pair of outer steel plates, the first electrode is driven to be pressed on the surface of the outer steel plate by the pressurizing mechanism so that the first electrode and the second electrode clamp the part of the outer steel plate corresponding to the stiffening rib, electrifying the first electrode and the second electrode, melting the positions to be welded corresponding to the first electrode and the second electrode under the action of resistance heat, cooling, and fixedly connecting the corresponding parts, the welding operation can be carried out on a plurality of welding positions on the outer steel plate and the stiffening rib by moving the bracket so as to realize the welding and fixing of the stiffening rib on the outer steel plate, thereby solved current electric welding equipment and can't go deep into a pair of outer steel sheet inboard and carry out the welded problem to the stiffening rib. The double-steel-plate shear wall manufactured by the welding method has the advantages of smooth wall surface, small welding workload, small influence of the welding seam on the stress performance of the shear wall due to the quality of the welding seam, convenience in processing, economy, safety and the like, and the welding seam is positioned inside the structure.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Claims (10)
1. An electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall, comprising:
a bracket supported at the outer steel plate;
the pressurizing mechanism is arranged on the bracket and corresponds to the surface of the outer steel plate;
the first electrode is connected with the pressurizing mechanism and is driven to be pressed against the surface of the outer steel plate by the pressurizing mechanism;
the connecting rod is connected to the support, arranged along the arrangement direction of the stiffening rib and bent at the end parts of the outer steel plates and the stiffening rib so as to extend into the space between the pair of outer steel plates, and the end part of the connecting rod extends to the other end parts of the outer steel plates and the stiffening rib; and
and the second electrode is arranged at the end part of the connecting rod, is opposite to the first electrode and is abutted against the surface of the stiffening rib, and then clamps the part of the outer steel plate corresponding to the stiffening rib through the first electrode and the second electrode to perform welding operation.
2. An electric resistance welding apparatus for a double steel plate shear wall internal stiffener according to claim 1, wherein the length of the second electrode is adjustable, and the end of the second electrode is pressed against the portion of the stiffener to be welded by adjusting the length of the second electrode.
3. An electric resistance welding apparatus for a double steel plate shear wall internal stiffener according to claim 1, wherein the connecting rods include a first connecting rod, a second connecting rod perpendicularly connected to the first connecting rod, and a third connecting rod perpendicularly connected to the second connecting rod;
the third connecting rod is parallel to the first connecting rod, and the length of the first connecting rod and the length of the third connecting rod are greater than the length of the stiffening rib and the length of the outer steel plate.
4. An electric resistance welding apparatus for a stiffener inside a double steel plate shear wall according to claim 1, wherein the bottom of the bracket is provided with rollers by which the bracket is moved in the direction of the stiffener so as to bring the first and second electrodes to the welding position.
5. An electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to claim 4, wherein the brackets comprise struts arranged in the width direction of the outer steel plate and vertical rods connected perpendicularly to both ends of the struts;
the length of the supporting rod is greater than the width of the outer steel plate;
the bottom of the upright stanchion is connected with the roller.
6. An electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to claim 5, wherein a plurality of said pressurizing mechanisms, a plurality of said first electrodes, a plurality of said connecting rods, and a plurality of said second electrodes are mounted on said struts so that a plurality of said stiffening ribs can be welded by a plurality of said first electrodes and a plurality of said second electrodes in synchronization.
7. A welding method of an electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to claim 1, comprising the steps of:
providing a pair of outer steel plates and a plurality of stiffening ribs, and laying the stiffening ribs between the pair of outer steel plates at intervals;
the bracket is supported at the outer steel plate, the first electrode and the second electrode are positioned at the end parts of the outer steel plate and the stiffening rib by moving the bracket, the first electrode is arranged corresponding to the surface of the outer steel plate, and the second electrode is correspondingly pressed against the surface of the stiffening rib;
driving the first electrode to abut against the surface of the outer steel plate by using the pressurizing mechanism, and further clamping the part, corresponding to the stiffening rib, of the outer steel plate by using the first electrode and the second electrode and performing welding operation;
and moving the support and carrying the first electrode and the second electrode to the next welding position through the support to perform welding operation, and repeating the step until the welding of the stiffening rib and the outer steel plate is completed.
8. The welding method of an electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to claim 7, further comprising the steps of:
and when the support is moved, moving the support along the arrangement direction of the stiffening ribs.
9. The welding method of an electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to claim 7, wherein the length of the second electrode is adjustable; the welding method further comprises the following steps:
after the second electrode extends into the space between the pair of outer steel plates, the length of the second electrode is adjusted, so that the end part of the second electrode is pressed against the part corresponding to the stiffening rib.
10. The welding method of an electric resistance welding apparatus for internal stiffeners of a double steel plate shear wall according to claim 7, further comprising the steps of:
and after the plurality of stiffening ribs are laid between the pair of outer steel plates at intervals, the end parts of the stiffening ribs are fixedly connected with the end parts of the pair of outer steel plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010529297.6A CN111730182B (en) | 2020-06-11 | 2020-06-11 | Resistance welding equipment for internal stiffening ribs of double-steel-plate shear wall and welding method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010529297.6A CN111730182B (en) | 2020-06-11 | 2020-06-11 | Resistance welding equipment for internal stiffening ribs of double-steel-plate shear wall and welding method thereof |
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| CN111058552A (en) * | 2020-01-08 | 2020-04-24 | 北京和筑科技有限公司 | Resistance welding steel plate concrete shear wall |
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| CN1170857A (en) * | 1996-07-15 | 1998-01-21 | 陈奇能 | Method for producing inner tube of electric water heater |
| CN102296728A (en) * | 2011-06-20 | 2011-12-28 | 南通建筑工程总承包有限公司 | Double-steel plate structure shear wall and construction method thereof |
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