CN111173297A - Reinforcing steel bar mounting and positioning device and construction method thereof - Google Patents
Reinforcing steel bar mounting and positioning device and construction method thereof Download PDFInfo
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- CN111173297A CN111173297A CN201911408872.0A CN201911408872A CN111173297A CN 111173297 A CN111173297 A CN 111173297A CN 201911408872 A CN201911408872 A CN 201911408872A CN 111173297 A CN111173297 A CN 111173297A
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- clamping plate
- steel bar
- positioning device
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
- E04G21/16—Tools or apparatus
- E04G21/18—Adjusting tools; Templates
- E04G21/1841—Means for positioning building parts or elements
- E04G21/185—Means for positioning building parts or elements for anchoring elements or elements to be incorporated in the structure
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Conveying And Assembling Of Building Elements In Situ (AREA)
Abstract
The invention discloses a reinforcing steel bar mounting and positioning device and a construction method thereof. The device comprises: the upper clamping plate is formed by splicing a first clamping plate and a second clamping plate along the length direction, a plurality of semicircular holes with opposite positions are formed in the splicing edge of the first clamping plate and the second clamping plate, a plurality of steel bar positioning holes are formed after splicing, and first mounting holes are formed in the two ends of the first clamping plate and the second clamping plate; the collet is equipped with the registration arm that position and reinforcing bar locating hole correspond down along length direction, and the internal diameter suits with vertical reinforcing bar external diameter, and the collet both ends of going to the bottom are equipped with the second mounting hole that position and first mounting hole correspond, and the installed part is worn in first mounting hole and second mounting hole, and is fixed with punch holder and the support of going to the bottom. The device is easy to assemble and disassemble, high in application flexibility and good in stability, can avoid deviation in the reinforcing steel bar installation process and displacement in the concrete pouring process, improves the reinforcing steel bar installation and positioning accuracy, ensures the thickness of the concrete protective layer, and further improves the qualification rate of the concrete protective layer and the reliability and durability of components.
Description
Technical Field
The invention relates to the technical field of building construction positioning devices, in particular to a reinforcing steel bar mounting and positioning device and a construction method thereof.
Background
The installation of reinforcing steel bars and the pouring of reinforcing steel bar protective layers are important construction processes of large-scale bridge tunnels and building construction engineering, and the reinforcing steel bar protective layers are important parts of the quality and the durability of reinforced concrete.
The protective layer is used for ensuring that the reinforcing steel bars and surrounding concrete work together, so that the reinforcing steel bars can fully exert the strength required by calculation, and the reinforcing steel bars are prevented from being corroded, so that the structural reliability is reduced because the reinforcing steel bars are not corroded within the designed service life of the member; in addition, the reinforced concrete requirement with fire prevention requirement and the prestressed component are met, and the component can not lose the supporting capability in the time of the fire resistance limit determined by the fire resistance grade of the building in the fire disaster.
The larger the thickness of the concrete protective layer is, the better the bonding anchoring performance, durability and fireproof performance of the stressed steel bars of the member are. However, the excessive thickness of the protective layer can cause the width of a crack generated after the member is stressed to be too large, so that outside air and water can enter the concrete member to cause the corrosion of the reinforcing steel bars to be accelerated, the concrete protective layer can be peeled off, and the service life and the function of the member are reduced. Therefore, the thickness of the concrete protective layer of the building and the structure is strictly regulated in design, and the construction difference value specification is strictly limited, but the qualification rate of the existing concrete protective layer is still not high generally.
In view of the above, the inventor considers that the accuracy of the steel bar installation directly relates to the qualification rate of the steel bar protection layer, so as to improve the steel bar installation positioning device in the prior art.
Disclosure of Invention
The invention aims to provide a reinforcing steel bar mounting and positioning device to solve the problems that the yield of a concrete protective layer is influenced by deviation in the reinforcing steel bar mounting and welding process and displacement in the concrete pouring process in the prior art.
The invention also aims to provide a construction method of the reinforcing steel bar installation positioning device.
The above purpose is realized by the following technical scheme:
according to one aspect of the present invention, there is provided a reinforcing bar installation positioning device, the device comprising:
the steel bar positioning device comprises an upper clamping plate, a first clamping plate and a second clamping plate, wherein the upper clamping plate is formed by splicing and fixing the first clamping plate and the second clamping plate along the length direction, semicircular holes with opposite positions are formed in the spliced edges of the first clamping plate and the second clamping plate, the semicircular holes form steel bar positioning holes after splicing, and first mounting holes are formed in the two ends of the first clamping plate and the second clamping plate;
the lower base is provided with a positioning pipe corresponding to the steel bar positioning hole in position along the length direction, the inner diameter of the positioning pipe is matched with the outer diameter of the vertical steel bar, and two ends of the lower base are provided with second mounting holes corresponding to the first mounting holes in position;
the mounting piece penetrates through the first mounting hole and the second mounting hole to fixedly mount the upper clamping plate and the lower bottom bracket.
Preferably, the first mounting hole and the second mounting hole are threaded holes, and the mounting piece is a bolt. The mounting member further comprises a plurality of locking members, and more preferably, is a nut, that is, a bolt and a nut are used for mounting and fixing the upper clamping plate and the lower base bracket.
Preferably, the device further comprises a height adjustable brace. The diagonal brace may include a first diagonal brace and/or a second diagonal brace.
Specifically, the device further comprises a first inclined strut arranged on the upper clamping plate, wherein the height of the first inclined strut is adjustable, and the first inclined strut is used for determining and adjusting the height of the upper clamping plate. The arrangement of the first inclined strut can conveniently position and adjust the upper clamping plate, and the thickness of the protective layer is effectively ensured.
Preferably, the upper splint is provided with a fixing lug; the first inclined strut comprises a supporting rod, the supporting rod is formed by connecting a female rod sleeve and a screw, the upper end of the supporting rod is connected with the fixing lug, and the lower end of the supporting rod is provided with a U-shaped fixture for connecting the template.
Preferably, the upper end of the supporting rod is provided with a hinged joint which is connected with the fixing lug through a bolt, the U-shaped fixture comprises a U-shaped groove and a bolt which is arranged on one groove wall, the head of the bolt faces to the other groove wall, and the tail of the bolt is fixed on the outer wall of the U-shaped groove through a nut.
Preferably, the first clamping plate and the second clamping plate are spliced and fixed in a joggle mode. More preferably, the dovetail joint is a dovetail joint matched with a dovetail groove.
Preferably, the device still includes the mounting, first splint and second splint are provided with the corresponding fixed orifices in position along width direction, pass through the fixed orifices of first splint and the fixed orifices of second splint with the both are fixed to the mounting. More preferably, the fixing piece is a bolt, the fixing hole is a bolt hole, and the first clamping plate and the second clamping plate are spliced and fixed through the bolt.
Preferably, the lower bottom support is of a channel steel structure.
Preferably, the device further comprises a second brace for fixing the position of the lower shoe.
Preferably, the device is still including installing the support at the vertical distribution muscle at positioner both ends, can let the distribution muscle pinpoint distribute on the main muscle. Be provided with the notch on the support, this notch plays the fixed action, can not take place to slide after placing the distribution muscle. The supports are arranged at intervals, and one support is arranged at intervals to prevent downward bending of the middle of the distribution rib.
According to another aspect of the present invention, there is provided a construction method of a reinforcing bar installation positioning device, the construction method including the steps of: splicing the first clamping plate and the second clamping plate to form an upper clamping plate, and placing the upper clamping plate above the top surface of the bearing platform; a first inclined strut is arranged on the upper clamping plate, and the height of the upper clamping plate is adjusted through the first inclined strut; a lower bottom support is arranged below the top surface of the bearing platform; sequentially penetrating the mounting piece through the first mounting hole of the upper clamping plate and the second mounting hole of the lower clamping plate, and mounting and fixing the upper clamping plate and the lower bottom bracket; and inserting the vertical steel bars into the steel bar positioning holes and the positioning pipes to finish the installation of the vertical steel bars.
Preferably, the construction method further comprises: and adjusting the length of the first inclined strut after the framework is deformed due to the installation process of the steel bar, and performing accurate correction to ensure that the thickness of the steel bar protection layer is within a specified deviation range. Or comprises the following steps: and adjusting the length of the first inclined strut in advance in the direction opposite to the deformation direction of the framework according to the deformation degree of the steel reinforcement framework before the steel reinforcement is installed, namely performing advanced reverse setting to ensure that the thickness of the protective layer is still within a specified deviation range after the steel reinforcement is installed. The deformation degree of the steel reinforcement framework can be calculated according to the previous framework deformation degree statistics or the average value. The adjusting step of the first inclined strut can enable the steel reinforcement framework to be accurately positioned after being installed, and the situation that the qualified rate of the protective layer is unsatisfactory due to overlarge deviation cannot occur.
Compared with the prior art, the method can effectively improve the accuracy of the installation and the positioning of the reinforcing steel bars, improve the construction efficiency, ensure that the thickness of the concrete protective layer is within the specified range, and improve the qualification rate of the concrete protective layer, the reliability of the component and the durability. Wherein, adopt the punch holder of two unification formulas for the device is easily assembled and is quick detachable, has improved the application flexibility ratio, and has the good wide advantage of application scope of steadiness.
Drawings
FIG. 1 is a schematic structural view of an upper clamp plate of the reinforcing bar installation positioning device of the present invention;
FIG. 2 is a schematic plan view of a lower plate of the reinforcing bar installation positioning device of the present invention;
FIG. 3 is a schematic structural view of the reinforcing bar installation positioning device of the present invention;
FIG. 4 is a schematic structural view of a first inclined strut of the reinforcing bar installation and positioning device of the present invention;
FIG. 5 is a schematic view of the positioning structure of the main ribs of the bearing platform.
In fig. 1-5, 100 upper clamping plates, 111 first clamping plates, 112 second clamping plates, 120 reinforcing steel bar positioning holes, 130 first mounting holes, 140 fixing lugs, 150 fixing holes and 151 fixing pieces; 200 lower bottom support, 210 positioning tube, 230 second mounting hole; 300 a mount, 320 a lock; 400 a first inclined strut, 410 a supporting rod and 420U-shaped clamps; 600 vertical reinforcing steel bars; 700 reinforcing steel bars on the top surface of the bearing platform.
Detailed Description
Embodiments of the bored pile percussion bit fishing tool of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art will recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the description of the drawings is illustrative in nature and not limiting the scope of the claims.
Fig. 1 schematically shows the structure of an upper plate in a reinforcing bar installation and positioning device, fig. 2 schematically shows the planar structure of a lower plate in a reinforcing bar installation and positioning device, and fig. 3 schematically shows the structure of a reinforcing bar installation and positioning device, and as shown in fig. 1 to 3, the present invention provides a reinforcing bar installation and positioning device comprising an upper plate 100, a lower base plate 200, and a mounting member 300 for mounting and fixing the upper plate 100 and the lower base plate 200.
As shown in fig. 1, the upper splint 100 is a two-in-one splint, and is formed by splicing and fixing a first splint 111 and a second splint 112 in a longitudinal direction. Wherein, first splint 111 and second splint 112 are provided with a plurality of semicircle orifices (holes) that the relative position of border department of concatenation and equal with the reinforcing bar diameter, and two splint concatenations the back, and the semicircle orifice has just formed a plurality of reinforcing bar locating holes 120, the well to the well distance in reinforcing bar locating hole 120 hole is equal with the design distance of reinforcing bar (being equal to the reinforcing bar well to the well distance promptly). The first clamping plate 111 and the second clamping plate 112 are also provided with first mounting holes 130 at both ends, for example, four threaded holes.
In the present invention, the first clamping plate 111 and the second clamping plate 112 may be fixed by a dovetail joint, for example, a dovetail joint and a dovetail groove.
Alternatively, as shown in fig. 3, the first clamping plate 111 and the second clamping plate 112 are fixed by the fixing member 151. Specifically, the first clamping plate 111 and the second clamping plate 112 are provided with fixing holes 150 corresponding in position in the width direction, and are arranged on the side surfaces of the first clamping plate 111 and the second clamping plate 112 and close to the end positions, after the two clamping plates are closed, the fixing holes 150 on the two clamping plates are through, and the fixing member 151 is adopted to penetrate through the fixing holes 150 of the first clamping plate 111 and the fixing holes 150 of the second clamping plate 112, so that the first clamping plate 111 and the second clamping plate 112 are fixed. Preferably, the fixing member 151 is a bolt, the fixing hole 150 is a bolt hole, and the bolt passes through the bolt holes of the first clamping plate 111 and the second clamping plate 112 in sequence to fix the first clamping plate 111 and the second clamping plate 112.
In the present invention, the lower end (anchoring end) of the vertical steel bar of the structure is fixed by the lower base 200. As shown in fig. 2, a positioning tube 210 is disposed on the lower base 200 along the length direction, and the positioning tube 210 has an inner diameter equal to the outer diameter of the vertical steel bar and corresponds to the steel bar positioning hole 120. The lower bottom support 200 and the positioning tube 210 can be made of channel steel and short steel tubes with equal distance. Two second mounting holes 230 are respectively formed at both ends of the lower base plate 200, which correspond to the first mounting holes 130 of the upper clamping plate 100, and the second mounting holes 230 may also be bolt holes.
As shown in FIG. 3, the four mounting members 300 are inserted through the first and second mounting holes 130 and 230, and then the locking members 320 are used to fix the upper splint 100 and the lower shoe 200. The mounting member 300 is a bolt having a distance equal to an anchoring length of the reinforcing bar, and the locker 320 is a nut (see fig. 5).
As an alternative embodiment, the device of the present invention may further include a brace, which is height adjustable, mounted on the upper splint 100 and/or the lower support 200 for determining and adjusting the height of the device. Specifically, a first sprag 400 may be installed on the upper plate 100 for determining and adjusting the height of the upper plate 100; a second brace may also be mounted on the lower base 200 for fixing the position of the lower base 200 and adjusting the flatness thereof. The first inclined strut 400 is similar to the second inclined strut in structure and installation, and the first inclined strut 400 is specifically described as an example.
As shown in fig. 4, the first diagonal brace 400 includes a support rod 410, the upper end of the support rod 410 is provided with a hinge joint connected to the upper plate 100, the lower end (foot end) is provided with a U-shaped clamp 420 which is spherically hinged to fix the first diagonal brace 400 to a formwork or a fixed bracket, and four first diagonal braces 400, such as four feet of a stool, fix the upper plate 100 in place. The support rod 410 is formed by connecting a female rod sleeve and two threaded screw rods, and the length of the first inclined strut 400 is adjusted by rotating the female rod sleeve, so that the position of the upper clamp plate 100 is adjusted. The U-shaped fixture 420 includes a U-shaped groove and a bolt installed on one groove wall, and the head of the bolt contacts the template toward the inner side of the other groove wall, and the tail of the bolt is fixed on the outer wall of the U-shaped groove by a nut. As shown in fig. 1, a fixing lug 140 is provided at a side surface of the upper plate 100, and the fixing lug 140 is connected to the joint of the first inclined strut 400 by a bolt. Preferably, two fixing lugs 140 are provided on the outer side surfaces of the first clamping plate 111 and the second clamping plate 112, and the two fixing lugs 140 are distributed at positions close to the ends of the upper clamping plate 100.
As an optional embodiment, the device further comprises (positioning) brackets which are provided with vertical distribution ribs at two ends of the positioning device, so that the distribution ribs are accurately positioned and distributed on the main ribs. Be provided with the notch on the support, can not take place to slide after placing the distribution muscle to it is fixed. The supports are arranged at intervals, and one support is arranged at intervals to prevent downward bending of the middle of the distribution rib.
The construction process of the reinforcing steel bar installation and positioning device of the invention is described below with reference to the accompanying drawings 1-5:
as shown in fig. 5, the figure is a schematic view of positioning and installing the reinforcing steel bars of a bridge pier bearing platform, wherein the main reinforcing steel bars of the pier are phi 25, the middle-to-middle distance is 10cm, the distance of the main reinforcing steel bars extending into the bearing platform is 1.2m, after the reinforcing steel bars 700 on the top surface of the bearing platform are bound, the position of the reinforcing steel bars of the pier is measured by a total station, and the central position of the reinforcing steel bars is marked on a positioning steel plate in advance.
First, the first clamping plate 111 and the second clamping plate 112 are spliced to form the upper clamping plate 100, the upper clamping plate 100 is positioned 1m above the top surface of the bearing platform, the fixing lugs 140 on both sides of the upper clamping plate 100 are connected with the hinge head bolts of the first inclined strut 400, the U-shaped clamp 420 of the first inclined strut 400 is connected with the template, and the female rod sleeve of the support rod 410 in the first inclined strut 400 is rotated to adjust the position of the upper clamping plate 100 so as to accurately position the upper clamping plate. Wherein, the diameter of the steel bar positioning hole 120 on the upper splint 100 is 25mm, and the distance is 10 cm.
And secondly, mounting a lower bottom support 200 at a position 1.2m below the top surface of the bearing platform, wherein the bottom support is provided with short steel pipes with the inner diameter phi 25, which are in one-to-one correspondence with the steel bar positioning holes 120 of the upper clamping plate 100, at the positions along the long symmetrical axis, and the intervals are 10cm at the same time. The two ends of the lower base support 200 are connected and fixed with the first inclined strut 400, so that the lower base support is not displaced and deflected.
Then, the suspender bolt sequentially passes through the first mounting hole 130 of the upper clamping plate 100 and the second mounting hole 230 of the lower clamping plate, and is fixed on the upper clamping plate 100 and on the bottom surface of the lower base 200 by nuts, so that the upper clamping plate 100 and the lower base 200 are mounted and fixed, after being mounted, the vertical steel bar 600 (a threaded steel bar) of phi 25 is inserted into the corresponding steel bar positioning hole 120 and the corresponding positioning pipe 210 respectively, the pier stud main steel bar phi 25 is welded with the bearing platform main steel bar at the top of the bearing platform, and a spot welding mode can be adopted, so that the fixation of the phi 25 steel bar is completed.
According to the invention, after the reinforcing steel bars are fixed, the upper clamping plate 100 is provided with the (positioning) supports for the vertical distribution ribs, the distribution ribs of the main pier stud are quickly installed, the main ribs form a framework, the part positioned in the bearing platform of the positioning device is removed, and the bearing platform concrete is poured. In the concrete pouring process, if the main reinforcement is deformed and displaced, the female rod sleeve of the inclined strut can be adjusted to perform accurate correction so as to ensure the thickness of the reinforcing steel bar protective layer. Alternatively, before the reinforcing bars are installed, the lengths of the first inclined struts 400 are adjusted in advance in the direction opposite to the deformation direction of the framework according to the deformation degree of the framework during the welding process of the reinforcing bars, that is, the advance and reverse setting is performed, so as to ensure that the thickness of the protective layer is still within the specified deviation range after the reinforcing bars are installed.
After the concrete of the bearing platform is bound and installed by reinforcing steel bars and finally set, the positioning device is completely removed (the bolts of the fixing piece 151 of the upper clamping plate 100 and the U-shaped clamp 420 are loosened), the pier stud is supported by a template, the concrete is poured, then the thickness of the reinforcing steel bar protective layer is checked, and the qualification rate of the reinforcing steel bar protective layer poured by the method is over 95 percent through detection.
Claims (10)
1. A rebar installation positioning device, the device comprising:
the steel bar positioning device comprises an upper clamping plate, a first clamping plate and a second clamping plate, wherein the upper clamping plate is formed by splicing and fixing the first clamping plate and the second clamping plate along the length direction, semicircular holes with opposite positions are formed in the spliced edges of the first clamping plate and the second clamping plate, the semicircular holes form steel bar positioning holes after splicing, and first mounting holes are formed in the two ends of the first clamping plate and the second clamping plate;
the lower base is provided with a positioning pipe corresponding to the steel bar positioning hole in position along the length direction, the inner diameter of the positioning pipe is matched with the outer diameter of the vertical steel bar, and two ends of the lower base are provided with second mounting holes corresponding to the first mounting holes in position;
the mounting piece penetrates through the first mounting hole and the second mounting hole to fixedly mount the upper clamping plate and the lower bottom bracket.
2. The rebar installation locator of claim 1, further comprising a first diagonal brace mounted on the upper clamp plate, the first diagonal brace having an adjustable height for determining and adjusting the height of the upper clamp plate.
3. The reinforcing bar installation positioning device of claim 2,
the upper clamping plate is provided with a fixing lug;
the first inclined strut comprises a supporting rod, the supporting rod is formed by connecting a female rod sleeve and a screw, the upper end of the supporting rod is connected with the fixing lug, and the lower end of the supporting rod is provided with a U-shaped fixture.
4. The reinforcing bar installation positioning device as claimed in claim 1, wherein the first clamping plate and the second clamping plate are fixed by joggling.
5. The reinforcing bar installation positioning device according to any one of claims 1 to 4, wherein the device further comprises a fixing member, the first clamping plate and the second clamping plate are provided with fixing holes corresponding in position in the width direction, and the fixing member passes through the fixing hole of the first clamping plate and the fixing hole of the second clamping plate to fix the first clamping plate and the second clamping plate.
6. The reinforcing bar installation positioning device of claim 5, wherein the fixing member is a bolt, and the fixing hole is a bolt hole; the first mounting hole and the second mounting hole are threaded holes, and the mounting piece is a bolt.
7. A rebar installation positioning device as set forth in claim 1 further including a second brace mounted on said bottom shoe for fixing the position of the bottom shoe.
8. The rebar installation positioning device of claim 1, further comprising brackets located at the ends of the upper clamping plate and used for positioning the vertically distributed rebar on the main rebar, wherein the brackets are arranged at intervals, and notches for preventing the vertically distributed rebar from sliding are formed in the brackets.
9. A construction method of a reinforcing bar installation positioning device according to claim 1, wherein the construction method comprises the steps of:
splicing the first clamping plate and the second clamping plate to form an upper clamping plate, and placing the upper clamping plate above the top surface of the bearing platform;
a first inclined strut is arranged on the upper clamping plate, and the height of the upper clamping plate is adjusted through the first inclined strut;
a lower bottom support is arranged below the top surface of the bearing platform;
the upper clamping plate and the lower bottom bracket are fixedly arranged by the mounting piece sequentially penetrating through the first mounting hole of the upper clamping plate and the second mounting hole of the lower clamping plate;
and inserting the vertical steel bars into the steel bar positioning holes and the positioning pipes to finish installation.
10. The construction method of a reinforcing bar installation positioning device according to claim 9, further comprising:
adjusting the length of the first inclined strut after the framework is deformed due to the installation of the steel bar, and ensuring that the thickness of the steel bar protection layer is within a specified deviation range;
or, before the reinforcing steel bar is installed, the length of the first inclined strut is adjusted in advance in the direction opposite to the deformation direction of the framework according to the deformation degree of the framework, so that the thickness of the protective layer is still within a specified deviation range after the reinforcing steel bar is installed and the framework is deformed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911408872.0A CN111173297A (en) | 2019-12-31 | 2019-12-31 | Reinforcing steel bar mounting and positioning device and construction method thereof |
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| CN201911408872.0A CN111173297A (en) | 2019-12-31 | 2019-12-31 | Reinforcing steel bar mounting and positioning device and construction method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112127637A (en) * | 2020-09-22 | 2020-12-25 | 中国五冶集团有限公司 | Construction method for pre-buried vertical component steel bars of foundation layer of fabricated building |
| CN113529934A (en) * | 2021-06-23 | 2021-10-22 | 广东省建筑设计研究院有限公司 | Beam column node of combination of steel bar area anchor plate and steel-pipe column shaped steel bracket |
| CN113756836A (en) * | 2021-09-06 | 2021-12-07 | 中铁北京工程局集团有限公司 | Advanced support structure for tunnel intersection and construction method thereof |
| CN113771374A (en) * | 2021-08-27 | 2021-12-10 | 珠海三洋电子有限公司 | Vertical elastic sewing machine |
| CN114197756A (en) * | 2021-11-25 | 2022-03-18 | 北京市住宅产业化集团股份有限公司 | Assembly type building transfer floor steel bar positioning clamp and construction method thereof |
| CN115749141A (en) * | 2022-10-28 | 2023-03-07 | 中国十七冶集团有限公司 | Control tool and installation method for concrete column steel bar positioning protective layer |
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