CN110158954B - Building pipeline pre-embedding device and construction method thereof - Google Patents
Building pipeline pre-embedding device and construction method thereof Download PDFInfo
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- CN110158954B CN110158954B CN201910492154.XA CN201910492154A CN110158954B CN 110158954 B CN110158954 B CN 110158954B CN 201910492154 A CN201910492154 A CN 201910492154A CN 110158954 B CN110158954 B CN 110158954B
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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
- E04G15/00—Forms or shutterings for making openings, cavities, slits, or channels
- E04G15/06—Forms or shutterings for making openings, cavities, slits, or channels for cavities or channels in walls of floors, e.g. for making chimneys
- E04G15/063—Re-usable forms
Abstract
The invention belongs to the technical field of pipeline embedded equipment, in particular to a building pipeline embedded device and a construction method thereof, aiming at the problems that the height of the existing pipeline embedded equipment is not convenient to adjust, the existing pipeline embedded equipment can not adapt to different concrete building thicknesses, and the existing pipeline embedded equipment is difficult to take out after concrete is solidified, the invention provides a scheme that the building pipeline embedded device comprises an outer pipe and an inner pipe movably sleeved at the inner side of the outer pipe, brackets are welded on the inner walls at two sides of the inner pipe, one end of the two brackets close to each other is rotatably provided with a same first screw rod, the outer side of the first screw rod is in threaded sleeve connection with a cross rod, two ends of the cross rod are welded on the outer pipe, and two first shafts are rotatably arranged in the inner pipe. Convenient operation and easy use.
Description
Technical Field
The invention relates to the technical field of pipeline pre-buried equipment, in particular to a building pipeline pre-buried device and a construction method thereof.
Background
In the prior art, in the construction process of constructional engineering, a pipeline floor-penetrating sleeve installation process generally includes that a hole is reserved firstly during construction, then a sleeve is added, and finally the hole is repaired, and through retrieval, a patent document with application number 201820461260.2 discloses a positioning device for embedding a pipeline sleeve in constructional engineering, which comprises a vertical limiting sleeve, a U-shaped ear buckle, a screw rod and a horizontal positioning baffle plate; the U-shaped ear buckles are uniformly fixed on the periphery of the vertical limiting sleeve; lead screw and U-shaped ear are buckled the one-to-one and are set up, its one end is detained with the U-shaped ear and is carried out adjustable connection, the other end sets up the horizontal location baffle perpendicularly and fixes with the wall, when setting up a plurality of vertical spacing sleeves, adjacent vertical spacing sleeve's U-shaped ear is detained through the pre-buried positioner of lead screw connection formation check font, a whole set of positioner overlaps in the sleeve pipe upper end, a list or group sleeve pipe installation location, once pre-buried completion, the construction process of reserving the hole has been reduced, construction cost is reduced, the level of device and vertical positioning system can ensure that the sleeve pipe location is accurate, it is pre-buried to utilize lead screw connection to realize that the sleeve pipe group is pre-buried, the preparation is succinct, and convenient for operation, can.
However, the height of the existing pipeline pre-buried equipment is not convenient to adjust, the existing pipeline pre-buried equipment cannot adapt to different concrete building thicknesses well, and the existing pipeline pre-buried equipment is difficult to take out after concrete is solidified and is not beneficial to use, so that a building pipeline pre-buried device and a construction method thereof are provided for solving the problems.
Disclosure of Invention
The invention aims to solve the defects that the height of the existing pipeline embedded equipment is not convenient to adjust, the equipment cannot adapt to different concrete building thicknesses, and the concrete is difficult to take out after solidification, and provides a building pipeline embedded device and a construction method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a building pipeline pre-buried device, establish the inboard inner tube of outer tube including outer tube and movable sleeve, all the welding has the support on the both sides inner wall of inner tube, the one end that two supports are close to each other is rotated and is installed same first screw rod, the outside thread bush of first screw rod is equipped with the horizontal pole, the both ends of horizontal pole are all welded on the outer tube, two primary shafts are installed to the inner tube internal rotation, the outside welding of screw rod has first helical gear, the one end welding of primary shaft has the second helical gear, first helical gear meshes with the second helical gear mutually, be equipped with two rectangular poles in the inner tube, the outside slip cover of rectangular pole is equipped with the second screw rod, the outside thread bush of second screw rod is equipped with the ball, the ball.
Preferably, the same first rods are welded on the inner walls of the two sides of the inner pipe, the two ends, close to each other, of the two first rods are rotatably provided with the second shaft, the bottom end of the second shaft is welded with an eccentric wheel, the outer sides of the rectangular rods are welded with partition plates, the outer sides of the two partition plates are in rolling contact with the outer sides of the two eccentric wheels respectively, and the eccentric wheels can drive the rectangular rods to move and be inserted into the rectangular grooves through the partition plates when rotating.
Preferably, the top end of the first screw rod extends into the outer pipe and is welded with the first knob, the outer side of the first screw rod is fixedly sleeved with the inner ring of the first bearing, the outer ring of the first bearing is welded on the support, and the first screw rod is rotatably connected to the support through the first bearing.
Preferably, the outer side of the second shaft is fixedly sleeved with an inner ring of a second bearing, an outer ring of the second bearing is welded on the corresponding first rod, a second knob is welded at the top end of the second shaft, and the second shaft is rotatably connected to the first rod through the second bearing.
Preferably, the bottom of inner tube extends to the below of outer tube and welds and have the disc, the bottom welding of first screw rod has the carousel, and L type frame has all been welded to the top both sides of disc, and the inboard top movable contact with the disc of L type frame avoids the bottom of first screw rod to appear rocking.
Preferably, the outer side of the ball is rotatably connected with two limiting seats, the limiting seats are welded on the inner wall of the inner pipe, and the ball is rotatably connected on the inner pipe through the limiting seats.
Preferably, the mounting groove has all been seted up to rectangular channel and rectangular rod looks adaptation, the one end that two second screws are close to each other, rectangular rod slidable mounting is in corresponding mounting groove, and the one end that the spring was all welded to the one end that two rectangular rods kept away from each other, and the other end welding of spring is on the inner wall of corresponding mounting groove, and the rectangular rod can reset under the spring action of spring.
Preferably, a sealing ring is embedded on the inner side of the outer pipe, the outer side of the inner pipe is movably and hermetically connected with the inner side of the sealing ring, and the sealing performance between the outer pipe and the inner pipe is improved.
Preferably, the outside welding of second screw rod has the snap ring, the top welding of support has the gag lever post, and one side that two gag lever posts are close to each other respectively with one side movable contact that two snap rings kept away from each other, gag lever post and snap ring are used for restricting the position of second screw rod.
The invention also provides a construction method of the building pipeline pre-embedding device, which comprises the following steps:
s1: during construction, before concrete pouring, the outer pipe and the inner pipe are placed in a concrete pouring template, the bottom of the disc is in contact with a bottom side template of the concrete pouring template, the first screw rod is rotated and rotates on the support through the first bearing, and the cross rod is sleeved on the outer side of the first screw rod in a threaded manner, so that the cross rod can be driven to lift and adjust when rotating, the cross rod drives the outer pipe to stretch and adjust on the outer side of the inner pipe, the total height of the outer pipe and the inner pipe can be adjusted, the height is consistent with the thickness of the concrete pouring, and then pouring can be carried out in the concrete pouring template;
s2: after concrete is solidified on the outer side of the outer pipe and the outer side of the inner pipe, the outer pipe is lightly tapped by a rubber hammer to gradually separate the outer side of the outer pipe from the concrete, then the first screw rod is rotated to drive the cross rod to move upwards when the first screw rod rotates, the cross rod drives the outer pipe to slide upwards on the outer side of the inner pipe, at the moment, the outer pipe can be separated from the concrete, then the second shaft is rotated to drive the eccentric wheel to rotate, so that the eccentric wheel extrudes the partition plate when rotating, and the partition plate drives the rectangular rod to move towards the direction close to the first screw rod until the rectangular rod is inserted into the rectangular;
s3: the first screw rod of rotating, first screw rod is rotatory through first helical gear drive second helical gear, the second helical gear is rotatory through first axle drive rectangle pole, rectangle pole drive second screw rod rotates at the inboard of ball, the ball can move to the center that is close to the inner tube gradually in the outside of second screw rod, make the outside of inner tube shrink deformation slightly, make the outside of inner tube separate with the concrete gradually, then utilize vice alright take out outer tube and inner tube from the concrete, leave the preformed hole that outer tube and inner tube formed in the concrete, thick down thin on this preformed hole, the pipeline is after this preformed hole installation finishes, conveniently fill up the work in to the gap.
According to the building pipeline pre-embedding device and the construction method thereof, the outer pipe and the inner pipe are placed in the concrete pouring template, the bottom of the disc is in contact with the bottom side template of the concrete pouring template, the first screw rod is rotated to drive the first bearing to rotate on the bracket, the first screw rod is rotated to drive the cross rod to lift and adjust, the cross rod drives the outer pipe to stretch and retract on the outer side of the inner pipe to adjust, the total height of the outer pipe and the inner pipe is adjusted, the height is kept consistent with the thickness of concrete pouring, and pouring can be carried out in the concrete pouring template;
after the concrete is solidified, the outer pipe is lightly tapped through a rubber hammer to gradually separate the outer side of the outer pipe from the concrete, the first screw rod is rotated to drive the cross rod to move upwards, the outer pipe is driven by the cross rod to slide upwards on the outer side of the inner pipe, the outer pipe can be separated from the concrete, the second shaft is rotated to drive the eccentric wheel to rotate, the partition plate is extruded when the eccentric wheel rotates, the rectangular rod is driven by the partition plate to move towards the direction close to the first screw rod, and the rectangular rod can be inserted into the rectangular groove;
the first helical gear and the second helical gear are driven to rotate by rotating the first screw rod, the second helical gear drives the rectangular rod to rotate through the first shaft, the second screw rod is driven to rotate on the inner side of the ball through the rectangular rod, the ball gradually moves to the center close to the inner pipe on the outer side of the second screw rod, the outer side of the inner pipe slightly contracts and deforms, the outer side of the inner pipe is gradually separated from concrete, the outer pipe and the inner pipe can be taken out of the concrete through a vice, a reserved hole which is thick at the top and thin at the bottom and formed by the outer pipe and the inner pipe is reserved in the concrete, and after the pipeline is installed in the reserved hole, filling work can be conveniently carried out in a gap;
the concrete filling device is reasonable in design, the total height of the outer pipe and the total height of the inner pipe can be conveniently adjusted to be consistent with the building thickness of concrete, the outer pipe and the inner pipe can be conveniently taken out of the solidified concrete, filling work can be conveniently carried out after the pipeline is installed in the reserved hole, and the concrete filling device is convenient to operate and beneficial to use.
Drawings
Fig. 1 is a schematic structural diagram of a building pipeline embedding device provided by the invention;
fig. 2 is a schematic structural diagram of a part a of a building pipeline embedding device according to the present invention;
fig. 3 is a schematic structural diagram of a part B of a building pipeline embedding device according to the present invention;
fig. 4 is a schematic structural diagram of a part C of a building pipeline embedding device according to the present invention;
fig. 5 is a schematic structural diagram of a portion D of the building pipe embedding device according to the present invention.
In the figure: the sealing device comprises an outer pipe 1, an inner pipe 2, a bracket 3, a first screw rod 4, a cross rod 5, a first bevel gear 6, a first shaft 7, a second bevel gear 8, a rectangular rod 9, a second screw rod 10, a ball 11, a limiting seat 12, a rectangular groove 13, a second shaft 14, an eccentric wheel 15, a partition plate 16, a snap ring 17, a limiting rod 18, a spring 19, a rotating disc 20, a 21L-shaped frame 22, a disc 23, a first bearing 24, a second bearing 25, a first rod 25 and a sealing ring 26.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a building pipeline pre-embedding device, establish the inboard inner tube 2 of outer tube 1 including outer tube 1 and movable sleeve, all weld on the both sides inner wall of inner tube 2 has support 3, the one end that two supports 3 are close to each other rotates and installs same first screw 4, the outside thread bush of first screw 4 is equipped with horizontal pole 5, the both ends of horizontal pole 5 all weld on outer tube 1, two primary shafts 7 are installed to the inner tube 2 internal rotation, the outside welding of screw 4 has first helical gear 6, the one end welding of primary shaft 7 has second helical gear 8, first helical gear 6 meshes with second helical gear 8 mutually, be equipped with two rectangular poles 9 in the inner tube 2, the outside slip cover of rectangular pole 9 is equipped with second screw 10, the outside thread bush of second screw 10 is equipped with ball 11, ball 11 rotates on the inner tube 2 of connection, rectangular groove 13 has been seted up to the other end.
In this embodiment, the same first rods 25 are welded on the inner walls of the two sides of the inner tube 2, the second shafts 14 are rotatably mounted at the ends, close to each other, of the two first rods 25, the eccentric wheels 15 are welded at the bottom ends of the second shafts 14, the partition plates 16 are welded on the outer sides of the rectangular rods 9, the outer sides of the two partition plates 16 are respectively in rolling contact with the outer sides of the two eccentric wheels 15, and the eccentric wheels 15 can drive the rectangular rods 9 to move through the partition plates 16 and be inserted into the rectangular grooves 13 when rotating.
In this embodiment, the top end of the first screw rod 4 extends into the outer tube 1 and is welded with the first knob, the outer side of the first screw rod 4 is fixedly sleeved with the inner ring of the first bearing 23, the outer ring of the first bearing 23 is welded on the support 3, and the first screw rod 4 is rotatably connected on the support 3 through the first bearing 23.
In this embodiment, the outer side of the second shaft 14 is fixedly sleeved with an inner ring of the second bearing 24, an outer ring of the second bearing 24 is welded on the corresponding first rod 25, the top end of the second shaft 14 is welded with the second knob, and the second shaft 14 is rotatably connected to the first rod 25 through the second bearing 24.
In this embodiment, the bottom of inner tube 2 extends to the below of outer tube 1 and welds and have disc 22, and the bottom welding of first screw rod 4 has carousel 20, and L type frame 21 has all been welded to disc 22's top both sides, and the inboard top movable contact with disc 22 of L type frame 21 avoids first screw rod 4's bottom to appear rocking.
In this embodiment, the outside of ball 11 is rotated and is connected with two spacing seats 12, and spacing seat 12 welds on the inner wall of inner tube 2, and ball 11 rotates through spacing seat 12 and connects on inner tube 2.
In this embodiment, rectangular channel 13 and rectangular rod 9 looks adaptation, the mounting groove has all been seted up to the one end that two second screws 10 are close to each other, and rectangular rod 9 slidable mounting is in corresponding mounting groove, and the one end that two rectangular rod 9 kept away from each other all welds the one end of spring 19, and the other end welding of spring 19 is on the inner wall of corresponding mounting groove, and rectangular rod 9 can reset under spring 19's elastic force effect.
In this embodiment, the inner side of the outer tube 1 is fitted with a seal ring 26, and the outer side of the inner tube 2 is movably and sealingly connected to the inner side of the seal ring 26, thereby increasing the sealing property between the outer tube 1 and the inner tube 2.
In this embodiment, the snap ring 17 is welded on the outer side of the second screw 10, the limiting rod 18 is welded on the top of the bracket 3, one side of the two limiting rods 18, which is close to each other, is in movable contact with one side of the two snap rings 17, which is far away from each other, respectively, and the limiting rod 18 and the snap rings 17 are used for limiting the position of the second screw 10.
The embodiment also provides a construction method of the building pipeline embedding device, which comprises the following steps:
s1: during construction, before concrete pouring, the outer pipe 1 and the inner pipe 2 are placed in a concrete pouring template, the bottom of the disc 22 is in contact with a bottom side template of the concrete pouring template, the first screw rod 4 is rotated, the first screw rod 4 rotates on the bracket 3 through the first bearing 23, the cross rod 5 is in threaded sleeve connection with the outer side of the first screw rod 4, so that the cross rod 5 can be driven to carry out lifting adjustment when the first screw rod 4 rotates, the cross rod 5 drives the outer pipe 1 to carry out telescopic adjustment on the outer side of the inner pipe 2, the total height of the outer pipe 1 and the inner pipe 2 can be adjusted, the total height is consistent with the thickness of the concrete pouring, and then pouring work can be carried out in the concrete pouring template;
s2: after concrete is solidified on the outer side of the outer pipe 1 and the outer side of the inner pipe 2, the outer pipe 1 is slightly knocked by a rubber hammer, so that the outer side of the outer pipe 1 is gradually separated from the concrete, then the first screw rod 4 is rotated, the first screw rod 4 is rotated to drive the cross rod 5 to move upwards, the cross rod 5 drives the outer pipe 1 to slide upwards on the outer side of the inner pipe 2, at the moment, the outer pipe 1 can be separated from the concrete, then the second shaft 14 is rotated, the second shaft 14 drives the eccentric wheel 15 to rotate, so that the eccentric wheel 15 extrudes the partition plate 16 when rotating, and the partition plate 16 drives the rectangular rod 9 to move towards the direction close to the first screw rod 4 until the;
s3: rotating the first screw rod 4, the first screw rod 4 drives the second helical gear 8 to rotate through the first helical gear 6, the second helical gear 8 drives the rectangular rod 9 to rotate through the first shaft 7, the rectangular rod 9 drives the second screw rod 10 to rotate on the inner side of the ball 11, the ball 11 can move towards the center near the inner tube 2 gradually on the outer side of the second screw rod 10, the outer side of the inner tube 2 slightly contracts and deforms, the outer side of the inner tube 2 is gradually separated from concrete, then the outer tube 1 and the inner tube 2 can be taken out of the concrete by using a vice, a reserved hole formed by the outer tube 1 and the inner tube 2 is reserved in the concrete, the reserved hole is thick at the top and thin at the bottom, and after the pipeline is installed in the reserved hole, the gap is conveniently filled.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A building pipeline pre-embedding device comprises an outer pipe (1) and an inner pipe (2) movably sleeved on the inner side of the outer pipe (1), and is characterized in that supports (3) are welded on the inner walls of the two sides of the inner pipe (2), one end, close to each other, of each of the two supports (3) is rotatably installed with one first screw (4), a cross rod (5) is sleeved on the outer side of each first screw (4) in a threaded manner, the two ends of each cross rod (5) are welded on the outer pipe (1), two first shafts (7) are rotatably installed in the inner pipe (2), a first helical gear (6) is welded on the outer side of each screw (4), a second helical gear (8) is welded at one end of each first shaft (7), the first helical gears (6) are meshed with the second helical gears (8), two rectangular rods (9) are arranged in the inner pipe (2), and a second screw (10, the outer side of the second screw rod (10) is sleeved with a ball (11) in a threaded manner, the ball (11) rotates on the connected inner tube (2), the other end of the first shaft (7) is provided with a rectangular groove (13), the inner walls of the two sides of the inner tube (2) are welded with the same first rod (25), one ends of the two first rods (25) close to each other are all rotatably provided with a second shaft (14), the bottom end of the second shaft (14) is welded with an eccentric wheel (15), the outer side of the rectangular rod (9) is welded with a partition plate (16), the outer sides of the two partition plates (16) are respectively in rolling contact with the outer sides of the two eccentric wheels (15), the top end of the first screw rod (4) extends into the outer tube (1) and is welded with a first knob, the outer side of the first screw rod (4) is fixedly sleeved with an inner ring of a first bearing (23), and the, the fixed cover in the outside of secondary shaft (14) is equipped with the inner circle of second bearing (24), and the outer lane welding of second bearing (24) is on corresponding first pole (25), the top welding of secondary shaft (14) has the second knob, the bottom of inner tube (2) extends to the below of outer tube (1) and welds disc (22), the bottom welding of first screw rod (4) has carousel (20), and L type frame (21) have all been welded to the top both sides of disc (22), and the inboard top swing joint with disc (22) of L type frame (21), the outside of ball (11) is rotated and is connected with two spacing seats (12), and spacing seat (12) welding is on the inner wall of inner tube (2), rectangular channel (13) and rectangular rod (9) looks adaptation, and the mounting groove has all been seted up to the one end that two second screw rods (10) are close to each other, rectangular rod (9) slidable mounting is in corresponding mounting groove, one end of each rectangular rod (9) far away from each other is welded with one end of each spring (19), and the other end of each spring (19) is welded on the inner wall of the corresponding mounting groove.
2. The building pipeline embedding device as claimed in claim 1, wherein a sealing ring (26) is embedded in the inner side of the outer pipe (1), and the outer side of the inner pipe (2) is movably and hermetically connected with the inner side of the sealing ring (26).
3. The building pipeline embedding device as claimed in claim 1, wherein a snap ring (17) is welded to the outer side of the second screw (10), a limiting rod (18) is welded to the top of the bracket (3), and one side, close to each other, of each of the two limiting rods (18) is in movable contact with one side, far away from each other, of each of the two snap rings (17).
4. A construction method of a building pipeline embedding device is characterized by comprising the following steps:
s1: during construction, before concrete pouring, the outer pipe (1) and the inner pipe (2) are placed in a concrete pouring template, the bottom of the disc (22) is in contact with a bottom side template of the concrete pouring template, the first screw (4) is rotated, the first screw (4) rotates on the support (3) through the first bearing (23), the cross rod (5) is in threaded sleeve connection with the outer side of the first screw (4), the cross rod (5) can be driven to lift and adjust when the first screw (4) rotates, the cross rod (5) drives the outer pipe (1) to stretch and adjust on the outer side of the inner pipe (2), the total height of the outer pipe (1) and the total height of the inner pipe (2) can be adjusted, the height is consistent with the thickness of the concrete pouring, and then pouring work can be carried out in the concrete pouring template;
s2: after concrete is solidified on the outer side of the outer pipe (1) and the outer side of the inner pipe (2), the outer pipe (1) is tapped by a rubber hammer, so that the outer side of the outer pipe (1) is gradually separated from the concrete, then the first screw (4) is rotated, the first screw (4) is rotated to drive the cross rod (5) to move upwards, the cross rod (5) drives the outer pipe (1) to slide upwards on the outer side of the inner pipe (2), at the moment, the outer pipe (1) can be separated from the concrete, then the second shaft (14) is rotated, the second shaft (14) drives the eccentric wheel (15) to rotate, so that the eccentric wheel (15) extrudes the partition plate (16) when rotating, and the partition plate (16) drives the rectangular rod (9) to move towards the direction close to the first screw (4) until the rectangular rod (9) is inserted into;
s3: the first screw rod (4) is rotated, the first screw rod (4) drives the second bevel gear (8) to rotate through the first bevel gear (6), the second bevel gear (8) drives the rectangular rod (9) to rotate through the first shaft (7), the rectangular rod (9) drives the second screw rod (10) to rotate on the inner side of the ball (11), the ball (11) can gradually move towards the center close to the inner pipe (2) on the outer side of the second screw rod (10), the outer side of the inner pipe (2) slightly shrinks and deforms, the outer side of the inner pipe (2) is gradually separated from concrete, then the outer pipe (1) and the inner pipe (2) can be taken out of the concrete through a vice, a reserved hole formed by the outer pipe (1) and the inner pipe (2) is reserved in the concrete, the reserved hole is thick at the top and thin, and the pipeline can be conveniently filled into a gap after being installed in the reserved hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910492154.XA CN110158954B (en) | 2019-06-06 | 2019-06-06 | Building pipeline pre-embedding device and construction method thereof |
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| CN201910492154.XA CN110158954B (en) | 2019-06-06 | 2019-06-06 | Building pipeline pre-embedding device and construction method thereof |
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| CN110158954B true CN110158954B (en) | 2021-05-07 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111379413B (en) * | 2020-03-19 | 2021-09-10 | 中国核工业中原建设有限公司 | Diameter-variable hole reservation device for building |
| CN112813780B (en) * | 2020-12-31 | 2022-06-07 | 江西科技学院 | Automatic cement concrete pavement dowel bar laying device |
| CN113738114A (en) * | 2021-09-05 | 2021-12-03 | 中建八局第四建设有限公司 | Plate thickness control device and plate thickness control method |
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