CN113145772A - Novel upset head of reinforced precast pile and production method thereof - Google Patents
Novel upset head of reinforced precast pile and production method thereof Download PDFInfo
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- CN113145772A CN113145772A CN202110391159.0A CN202110391159A CN113145772A CN 113145772 A CN113145772 A CN 113145772A CN 202110391159 A CN202110391159 A CN 202110391159A CN 113145772 A CN113145772 A CN 113145772A
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- clamp
- heading
- head
- hammer
- oil cylinder
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F5/00—Upsetting wire or pressing operations affecting the wire cross-section
- B21F5/005—Upsetting wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/06—Hammers tups; Anvils; Anvil blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/06—Swaging presses; Upsetting presses
- B21J9/08—Swaging presses; Upsetting presses equipped with devices for heating the work-piece
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/12—Drives for forging presses operated by hydraulic or liquid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/10—Drives for forging presses
- B21J9/20—Control devices specially adapted to forging presses not restricted to one of the preceding subgroups
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/58—Prestressed concrete piles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention provides a novel upset head of an enhanced precast pile and a production method thereof, wherein the novel upset head comprises a tail end upset head and a middle upset head, the tail end upset head is used for being clamped on a tensioning plate, the middle upset head is used for being clamped on an end plate, a replaceable hammer head is arranged on the upset head machine for producing the novel upset head, a main rib is inserted into the bottom of a blind hole of the hammer head with the blind hole when the upset head is upset for the first time, a control system controls a clamping oil cylinder to drive a clamp to clamp the main rib, and the main rib between the front end surface of the hammer head and the clamp is extruded to form the middle upset head; after the main rib is taken out, the hammer head is replaced by the solid hammer head for secondary heading processing, the main rib between the front end surface of the hammer head and the clamp is extruded to form a tail end heading, and therefore the novel heading processing is completed. The method can produce the main rib with the double-upset head structure, solves the problem that the end plate is required to be connected with the tensioning plate through the bolt, improves the production efficiency, and reduces the labor intensity of operators.
Description
Technical Field
The invention relates to the field of production of prefabricated parts, in particular to a production method of a novel upset head.
Background
The pre-tensioned concrete precast pile is used as a new building product and is widely applied to the construction of various industries. In order to improve the bending resistance of a precast pile product, in the manufacturing stage of a steel reinforcement cage, end plates with a plurality of counter sink holes are required to be installed at two ends of a precast pile die, upset heads in an enlarged head shape are processed at two ends of a plurality of longitudinal steel reinforcements of the steel reinforcement cage, the upset heads with the same number at two sides are respectively clamped in the counter sink holes of the end plates at two ends, then the end plate at one end is fixed, and a tensioning plate and the end plate are fixed by a tensioning bolt. The longitudinal bars of the steel reinforcement cage are stretched through the tensioning plate by hydraulic tensioning equipment, and the steel reinforcement cage is kept in a stretched state by adopting an anchoring device after stretching is completed. Then, concrete is poured into the mould, after the concrete is solidified, the anchoring device is loosened, the reinforcement cage cemented with the concrete cannot rebound, and the prestress of the longitudinal reinforcement is kept all the time, so that the bending resistance of the whole precast pile is improved.
At present, the steel bars of almost all pre-tensioning concrete precast piles adopt tail-end upsets at two ends, the upsets are clamped in end plate countersunk holes at two ends, the end plates are connected with tensioning plates through mounting bolts and then tensioned, when concrete is solidified, the bolts are disassembled, the tensioning plates are disassembled and then reused, and the end plates and the concrete form an integrated precast pile product.
In addition, the existing heading machine only has the function of heading one end and cannot realize double heading or multiple heading;
the technical problems existing in the mode are as follows:
1. the connecting bolts are required to be connected with the sleeves or the end plates for clamping the steel bar heading heads, and the connecting bolts and the tensioning plates are required to be reused, so that after the concrete of the precast pile is solidified and formed, the connecting bolts are required to be disassembled, the tensioning assemblies on two sides are provided with a plurality of connecting bolts, the assembling and disassembling of the bolts not only reduces the production efficiency, but also increases the labor intensity of operators;
2. the original heading machine has single function, and only one end of the steel bar can be upset by one heading.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a novel method for producing the upset head, and the problems of high labor intensity and low production efficiency of the prior art are effectively solved by designing a novel structure of the upset head.
In order to solve the technical problem provided by the invention, the technical scheme is as follows: the utility model provides a novel heading of enhancement mode precast pile which characterized in that: the steel bar (1) is provided with a tail end heading (1-1) and a middle heading (1-2).
Preferably, the tail end upset head (1-1) and the middle upset head (1-2) are in any one of T-shaped or conical structures.
Preferably, the distance between the end heading (1-1) and the middle heading (1-2) is 30-100 mm.
In order to solve the technical problem provided by the invention, another technical scheme is provided: the heading machine (2) comprises a heading oil cylinder (2-1), a hammer head sleeve (2-2), a hammer head (2-3), a clamping oil cylinder (2-4) and a clamp (2-5); the upsetting oil cylinder (2-1), the hammer head sleeve (2-2) and the clamping oil cylinder (2-4) are fixed on the upsetting machine (2); the rod of the upsetting oil cylinder (2-1) is connected with the hammer head (2-3), and the hammer head (2-3) can slide back and forth in the hammer head sleeve (2-2); a blind hole (2-3-1) is formed in the hammer head (2-3), and the tail end of the steel bar (1) extends into the blind hole (2-3-1); the clamp (2-5) is connected with an oil cylinder rod of the clamping oil cylinder (2-4), and a clamp groove (2-5-1) is formed in the opposite surface; the power supply (2-13) electrically connects the hammer head (2-3) with the clamp (2-5) through a lead (2-14); the hammer heads (2-3) can be replaced and are of a solid structure or a structure with blind holes.
Preferably, the clamp device further comprises a guide rail (2-6), the clamps (2-5) are mounted on the guide rail (2-6), the number of the clamps (2-5) is 2, the number of the clamping oil cylinders (2-4) is 2 or 1, and the clamps (2-5) are driven by the clamping oil cylinders (2-4) to move left and right or fixed on one side along the guide rail (2-6).
Preferably, the cross section of the hammer head (2-3) comprises a square shape, a circular shape or a polygonal shape.
Preferably, the shape of the jig groove (2-5-1) includes a circular arc shape, a square angle shape or a polygonal shape.
Preferably, the clamps (2-5) and the hammers (2-3) are respectively connected to different potentials of a power supply (2-13), different potential differences exist between the clamps and the hammers, and short-circuit current flows on the steel bars (1) during heading.
Preferably, the device also comprises a tail end heading device, wherein the tail end heading device comprises a bottom plate (2-7), a longitudinal guide rail (2-8), a reverse upsetting oil cylinder (2-9), a reverse clamp (2-10), a reverse clamp guide rail (2-11) and a reverse clamp clamping oil cylinder (2-12); the reverse upsetting oil cylinder (2-9) drives the bottom plate (2-7) to move on the longitudinal guide rail (2-8), so that the reverse clamp (2-10) arranged on the driving bottom plate (2-7) is driven to move.
Preferably, the clamp comprises a first clamp part (3-1) and a second clamp part (3-2) which are arranged oppositely, a groove (3-3) for clamping the reinforcing steel bar is arranged on the opposite surface of the first clamp part (3-1) and the second clamp part (3-2), and a heading head groove (3-4) matched with the shape of the conical heading head is arranged at one end, close to the hammer head, of the upper end of the groove (3-3);
the novel heading machine is characterized in that 4 corners of the first clamp portion (3-1) and the second clamp portion (3-2) are provided with the same heading grooves (3-4), the first clamp portion (3-1) and the second clamp portion (3-2) rotate horizontally for 180 degrees, or the front and back surfaces of the first clamp portion (3-1) and the second clamp portion (3-2) are exchanged, and the first clamp portion (3-1) and the second clamp portion (3-2) can be normally used.
In order to solve the technical problem provided by the invention, another technical scheme is provided: the novel heading machine is manufactured by clamping and fixing a steel bar (1) on a heading machine (2); the method comprises the following specific steps:
the steel bar heading machine has the advantages that a hammer head (2-3) with a blind hole structure is mounted on a heading machine (2), a steel bar (1) with a certain length is inserted into the bottom of the blind hole (2-3-1) of the hammer head (2-3), then a heading instruction is sent to a control system, the control system firstly controls a clamp (2-5) driven by a clamping oil cylinder (2-4) to move towards the middle, and the steel bar (1) is clamped in a clamp groove (2-5-1);
the control system applies different electric potentials to the hammer heads (2-3) and the clamps (2-5), short-circuit current flows through the steel bars (1), the steel bars (1) are heated and softened under the action of the current, then the forging oil cylinders (2-1) drive the hammer heads (2-3) to move forwards, and the steel bars (1) between the front end surfaces of the hammer heads (2-3) and the clamps (2-5) are extruded to form middle hammer heads (1-2) due to the fact that the deformation of the steel bars (1) in the blind holes (2-3-1) of the hammer heads (2-3) is limited;
the power supply applied between the hammer heads (2-3) and the clamps (2-5) is disconnected by the control system, meanwhile, the hammer heads (2-3) are driven to retreat by the upsetting oil cylinder (2-1), then the clamps (2-5) driven by the clamping oil cylinder (2-4) move towards two sides, the reinforcing steel bars (1) are loosened, and the reinforcing steel bars (1) processed by the middle upset heads (1-2) are pulled out of the blind holes (2-3-1);
replacing a hammer head (2-3) with a solid structure in the heading machine (2), placing a part from a middle heading head (1-2) to the nearest tail end of the steel bar (1) in the middle of the clamp (2-5), and enabling the tail end of the steel bar (1) to abut against the end face of the hammer head (2-3); then sending an upset instruction to a control system, wherein the control system firstly controls a clamp (2-5) driven by a clamping oil cylinder (2-4) to move towards the middle, and clamps the reinforcing steel bar (1) in a clamp groove (2-5-1);
the control system applies different potentials to the hammer heads (2-3) and the clamps (2-5) again, short-circuit current flows through the steel bars (1), the steel bars (1) are heated and softened under the action of the current, then the upsetting oil cylinder (2-1) drives the hammer heads (2-3) to move forwards, and therefore the steel bars (1) between the front end faces of the hammer heads (2-3) and the clamps (2-5) are extruded to form tail end upset heads (1-1);
sixthly, the control system cuts off a power supply applied between the hammer head (2-3) and the clamp (2-5), the upsetting oil cylinder (2-1) drives the hammer head (2-3) to retreat, then the clamp (2-5) driven by the clamping oil cylinder (2-4) moves towards two sides, the reinforcing steel bar (1) is loosened, the reinforcing steel bar (1) processed by the tail end heading head (1-1) is taken out, and the processing of the reinforcing steel bar (1) of the middle heading head (1-2) and the tail end heading head (1-1) is completed.
In order to solve the technical problem provided by the invention, another technical scheme is provided: the method for producing the novel heading machine by using the heading machine is characterized in that the novel heading machine is manufactured by clamping and fixing a steel bar (1) on the heading machine (2); the method comprises the following specific steps:
firstly, after steel bars (1) are cut to a fixed length, the steel bars (1) are placed between symmetrically distributed reverse clamps (2-10) and symmetrically distributed clamps (2-5), and the head ends of the steel bars (1) are pressed against hammer heads (2-3);
secondly, sending an upset instruction, moving the clamps (2-5) driven by the clamping oil cylinders (2-4) to the middle to clamp the reinforcing steel bars (1), and tightly clamping the reinforcing steel bars (1) in the clamp grooves (2-5-1); meanwhile, the reverse clamp (2-10) driven by the reverse clamp clamping oil cylinder (2-1)2 moves towards the middle to clamp the steel bar (1), the steel bar (1) is tightly clamped in the groove of the reverse clamp (2-10), and the groove of the reverse clamp (2-10) and the groove of the clamp (2-5-1) are arranged in the same direction and in the front and back direction and have the same structure;
the power supply (2-13) connects the hammer heads (2-3) with the reverse clamp (2-10) through the leads (2-14), after the steel bar (1) is contacted with the hammer heads (2-3) and the reverse clamp (2-10), different potentials are applied between the hammer heads (2-3) and the reverse clamp (2-10), short-circuit current flows on the steel bar (1), the steel bar (1) is heated and softened under the action of the current, and then the upsetting oil cylinder (2-1) drives the hammer heads (2-3) to move forwards, so that the steel bar (1) between the front end face of the hammer heads (2-3) and the clamp (2-5) is extruded to form a tail end upset head (1-1); meanwhile, the reverse upsetting oil cylinder (2-9) drives the bottom plate (2-7) to move forwards on the longitudinal guide rail (2-8), the reverse clamp (2-10) moves forwards correspondingly as the reverse clamp (2-10) is installed on the bottom plate (2-7), and the reinforcing steel bar (1) between the opposite surfaces of the reverse clamp (2-10) and the clamp (2-5) is extruded to form a middle upset head (1-2);
a power supply (2-13) applied between the hammer head (2-3) and the reverse clamp (2-10) is disconnected, the hammer head (2-3) is driven to retreat by the upsetting oil cylinder (2-1), then the reverse clamp clamping oil cylinder (2-12) drives the reverse clamp (2-10) to move towards two sides, after the reinforcing steel bar (1) is loosened, the reverse upsetting oil cylinder (2-9) retreats, and the bottom plate (2-7) is driven to retreat; the clamping oil cylinder (2-4) drives the clamp (2-5) to move towards two sides, the reinforcing steel bar (1) is loosened, and the equipment is restored to the initial state; at the moment, the reinforcing steel bar (1) processed by the tail end heading (1-1) and the middle heading (1-2) is taken out; and finishing the processing of the steel bar (1) of the middle heading (1-2) and the tail heading (1-1).
The cross section of the hammer head 2-3 comprises a square shape, a circular shape or a polygonal shape.
The shape of the clamp groove 2-5-1 comprises an arc shape, a square angle shape or a polygon shape.
The hammer heads 2-3 can be replaced and have a solid structure or a structure with blind holes.
The clamps 2-5 and the hammers 2-3 are respectively connected to different potentials of a power supply, different potential differences exist between the clamps and the hammers, and short-circuit current flows on the steel bar 1 during heading.
The bottom plates 2-7 are added; 2-8 of longitudinal guide rails; 2-9 parts of reverse upsetting oil cylinder; 2-10 parts of a reverse clamp; reverse clamp guide rails 2-11; clamping the oil cylinder 2-12 by a reverse clamp; the power supply 2-13 electrically connects the hammer 2-3 with the reverse clamp 2-10 through a lead 2-14.
The fixture comprises a first fixture portion 3-1 and a second fixture portion 3-2 which are arranged oppositely, a groove 3-3 used for clamping a steel bar is arranged on the opposite surface of the first fixture portion 3-1 and the second fixture portion 3-2, and an upset head groove 3-4 matched with the shape of a conical upset head is arranged at one end, close to the hammer head, of the upper end of the groove 3-3.
The same heading grooves 3-4 are formed in 4 corners of the first clamp portion 3-1 and the second clamp portion 3-2, the first clamp portion 3-1 and the second clamp portion 3-2 horizontally rotate 180 degrees, or after the front and back sides of the first clamp portion 3-1 and the second clamp portion 3-2 are exchanged, the first clamp portion 3-1 and the second clamp portion 3-2 can be normally used.
The heading machine comprises a heading and calcining oil cylinder, a hammer head sleeve, a hammer head, a clamping oil cylinder, a clamp and a guide rail.
The upsetting and forging oil cylinder is fixed on the heading machine, and an oil cylinder rod of the upsetting and forging oil cylinder is connected with the hammer;
the hammer head sleeve is fixed on the heading machine, and the hammer head can slide back and forth in the hammer head sleeve;
the clamping oil cylinder is fixed on the heading machine, and an oil cylinder rod of the clamping oil cylinder is connected with the clamp;
the number of the clamping oil cylinders and the number of the clamps are 2, and the clamping oil cylinders and the clamps are symmetrically arranged along the axis of an oil cylinder rod and a hammer head of the upsetting oil cylinder;
the guide rail is fixed on the heading machine, and the clamp is arranged on the guide rail and can move left and right along the guide rail;
the hammer head can be of a solid structure and can also be of a structure with a blind hole; the shape of the hammerhead B in the direction of the view comprises but is not limited to a square shape, a circular shape, a polygonal shape and the like;
the opposite surfaces of the clamps are provided with clamp grooves which are symmetrically arranged along the axes of the oil cylinder rod and the hammer head of the upsetting oil cylinder, and the shapes of the clamp grooves include but are not limited to circular arc, square angle, polygon and the like;
the steel bar is clamped in the clamp groove by the clamp driven by the clamping oil cylinder, the head end is inserted into the top end of the blind hole in the middle of the hammer head, different electric potentials are applied between the hammer head and the clamp at the moment, short-circuit current flows on the steel bar, the steel bar is heated and softened under the action of the current, the upsetting oil cylinder drives the hammer head to move forwards, and the front end surface of the hammer head and the clamp are squeezed to form a middle hammer head;
the steel bar forming the middle heading is taken out, the hammer head with the blind hole is changed into the hammer head with a solid structure, the steel bar is clamped in the clamp groove by the clamp driven by the clamping oil cylinder, the head end is propped against the end surface in front of the hammer head, different electric potentials are applied between the hammer head and the clamp again at the moment, short-circuit current flows on the steel bar, the steel bar is heated and softened under the action of the current, the heading and forging oil cylinder drives the hammer head to move forwards, and the front end surface of the hammer head and the clamp are extruded to form the tail end heading.
The invention has the beneficial effects that:
1. the novel steel bar with the upset head structure produced by the technology is respectively assembled and clamped with the end plate and the tensioning plate, so that the problem that the tensioning plate and the end plate need to be fastened and connected through bolts in the industry is solved, the workload of workers for frequently tightening and disassembling the connecting bolts is solved, the labor intensity of the workers is greatly reduced, and the production efficiency is improved.
2. The heading machine realizes the function of forging two heading heads or a plurality of heading heads at one end by replacing the hammerheads with different structures;
3. the invention provides a production method of a novel heading, which comprises a tail end heading and a middle heading, wherein the tail end heading is used for being clamped on a tensioning plate, the middle heading is used for being clamped on an end plate, a replaceable hammer head is arranged on a heading machine for producing the novel heading, a main rib is inserted into the bottom of a blind hole of the hammer head with the blind hole when heading for the first time, a control system controls a clamping oil cylinder to drive a clamp to clamp the main rib, and the main rib between the front end surface of the hammer head and the clamp is extruded to form the middle heading; after the main rib is taken out, the hammer head is replaced by the solid hammer head for secondary heading processing, the main rib between the front end surface of the hammer head and the clamp is extruded to form a tail end heading, and therefore the novel heading processing is completed. The method can produce the main rib with the double-upset head structure, solves the problem that the end plate is required to be connected with the tensioning plate through the bolt, improves the production efficiency, and reduces the labor intensity of operators; in addition, the heading machine realizes the function of forging two heading heads or a plurality of heading heads at one end by replacing the hammer heads with different structures.
4. The novel upset head main rib produced by the technology is characterized in that the upset head at the end part of the main rib is clamped in a counter bore of a tensioning plate, the upset head at the middle part is clamped in an end plate counter bore at one end, and meanwhile, a traction device is additionally arranged on a tensioning head plate, so that all the upset heads can be tightly clamped with the corresponding counter bores in the tensioning process of the main rib. After a steel reinforcement cage with a plurality of double-headed main reinforcements arranged at two ends is placed into the cage, the reinforcement penetrating holes of the end plates at the head end and the tail end sequentially penetrate through 2 heads of the main reinforcements, the head penetrating holes of the head tensioning head plate and the tail penetrating holes of the tail tensioning tail plate at the head end and the tail end of the main reinforcements rotate for a certain angle, and the connection of the heads and the corresponding counter bores can be realized. This mode all carries out the processing back of secondary upset head with whole main muscle both ends, the upset head respectively with the end plate, stretch-draw board assembles the joint, because of the tensile force is whole by the first upset head of head end, stretch-draw first upset head board and tail end, stretch-draw on the tailboard, under the prerequisite of guaranteeing the reinforcing bar tensile force, can effectually keep the second upset head of head end, the integrity of tail end second upset head, because head end plate and tail end plate are not atress at the in-process of stretch-draw, consequently stopped with head end plate and tail end plate that precast pile product is integrative by head end second upset head, the possibility that tail end second upset head pulled through, thereby the effectual quality of guaranteeing the product.
5. The invention provides a production method of a novel heading, which comprises a tail end heading and a middle heading, wherein the tail end heading is used for being clamped on a tensioning plate, the middle heading is used for being clamped on an end plate, a replaceable hammer head is arranged on a heading machine for producing the novel heading, a main rib is inserted into the bottom of a blind hole of the hammer head with the blind hole when heading for the first time, a control system controls a clamping oil cylinder to drive a clamp to clamp the main rib, and the main rib between the front end surface of the hammer head and the clamp is extruded to form the middle heading; after the main rib is taken out, the hammer head is replaced by the solid hammer head for secondary heading processing, the main rib between the front end surface of the hammer head and the clamp is extruded to form a tail end heading, and therefore the novel heading processing is completed. The method can produce the main rib with the double-upset head structure, solves the problem that the end plate is required to be connected with the tensioning plate through the bolt, improves the production efficiency, and reduces the labor intensity of operators; in addition, the heading machine realizes the function of forging two heading heads or a plurality of heading heads at one end by replacing the hammer heads with different structures.
Drawings
Figure 1 is a schematic view of a novel upset head.
Figure 2 is a structural top view of the novel heading machine.
Fig. 3 is a view in the direction B of the novel hammer head.
Fig. 4 is a C-direction sectional view of the novel hammer head.
Fig. 5 is a view of a hammer head in the direction B.
FIG. 6 is a view of a clamp in the direction A.
Figure 7 is a top view of the novel heading machine of the second embodiment.
Figure 8 is a schematic view of a tapered upset.
FIG. 9 is a schematic view of a fixture configured to mate with a tapered upset.
Fig. 10 is a schematic view of the assembly structure of the hammer head, the clamp and the reinforcing steel bar.
Fig. 11 is a schematic structural view of a counterbore.
In the figure:
1-reinforcing steel bars; 1-end heading; 1-2-middle heading; 2-heading machine; 2-1-upsetting oil cylinder; 2-hammer head cover; 2-3-hammerhead; 2-3-1-hammer blind hole; 2-4-clamping the oil cylinder; 2-5-clamping; 2-5-1-fixture groove; 2-6-guide rail; 2-7-a bottom plate; 2-8-longitudinal guide rail; 2-9-reverse upsetting oil cylinder; 2-10-reverse clamp; 2-11-reverse clamp guide rail; 2-12-reverse clamp clamping oil cylinder; 2-13-power supply; 2-14-wires; 3-1-a first clamp portion; 3-2-a second clamp portion; 3-3-grooves; 3-4-heading grooves; 3-5-countersunk holes.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
As shown in figure 1, the novel heading is characterized in that a tail end heading 1-1 and a middle heading 1-2 are arranged on a steel bar 1, and the heading is T-shaped. The structure of the upset in the present invention may also be tapered (as shown in figure 8). The distance between the tail end upset 1-1 and the middle upset 1-2 is 30-100 mm. The distance between the two upsets is too large, so that raw materials are wasted, and the distance is too small, so that the upsets cannot be processed, and therefore, the distance between the upsets is suitable for 30-100 mm.
Example 2
As shown in figure 2, the heading machine comprises a heading oil cylinder 2-1, a hammer head sleeve 2-2, a hammer head 2-3, a clamping oil cylinder 2-4, a clamp 2-5 and a guide rail 2-6. The upsetting oil cylinder 2-1 is fixed on the heading machine 2, and an oil cylinder rod of the upsetting oil cylinder 2-1 is connected with the hammer 2-3; the hammer head sleeve 2-2 is fixed on the heading machine 2, and the hammer head 2-3 can slide back and forth in the hammer head sleeve 2-2; as shown in fig. 3 and 4, the hammer head 2-3 may be a solid structure, or a blind hole 2-3-1 structure with a hammer head; as shown in fig. 4, the hammer head blind hole 2-3-1 is in a circular truncated cone structure, the diameter of the deepest part of the hammer head blind hole 2-3-1 is smaller, the diameter of the outlet of the end surface of the hammer head 2-3 is larger, so that a reinforcing steel bar 1 protruding from the front end can be smoothly pulled out after the middle hammer head 1-2 is upset, a certain included angle alpha is formed between the inclined edge of the hammer head blind hole 2-3-1 and the end surface of the hammer head 2-3, and the included angle alpha ranges from 85 degrees to 90 degrees. The shapes of the hammerheads 2-3B in the view direction include but are not limited to square, round, polygon and the like;
as shown in fig. 2, the clamping oil cylinder 2-4 is fixed on the heading machine 2, and an oil cylinder rod of the clamping oil cylinder 2-4 is connected with the clamp 2-5; the number of the clamping oil cylinders 2-4 and the number of the clamps 2-5 are 2, and the clamping oil cylinders and the clamps are symmetrically arranged along the axial lines of the oil cylinder rod of the upsetting oil cylinder 2-1 and the hammer head 2-3. The guide rail 2-6 is fixed on the heading machine 2, and the clamp 2-5 is arranged on the guide rail 2-6 and can move left and right 2-6 along the guide rail; when the clamping oil cylinder 2-4 drives the clamps 2-5 to be in a clamping state, the center line of the two clamps 2-5 is aligned with the axis of the oil cylinder rod of the upsetting oil cylinder 2-1 and the axis of the hammer 2-3;
as shown in fig. 6, the opposite surfaces of the clamps 2-5 are provided with clamp grooves 2-5-1, which are symmetrically arranged along the axes of the cylinder rod of the upsetting cylinder 2-1 and the hammer 2-3, and the shapes of the clamp grooves 2-5-1 include, but are not limited to, circular arc, square, polygon, etc.;
the steel bar 1 is clamped in the clamp groove 2-5-1 by the clamp 2-5 driven by the clamp oil cylinder 2-4, and the head end of the steel bar 1 is inserted into the top end of the blind hole 2-3-1 in the middle of the hammer 2-3. At the moment, the hammer heads 2-3 are connected with the clamps 2-5 through leads 2-14, a power supply 2-13 is provided with different potentials, short-circuit current flows on the steel bar 1, the steel bar 1 is heated and softened under the action of the current, the hammer heads 2-3 are driven by the upsetting oil cylinder 2-1 to move forwards, and the front end surfaces of the hammer heads 2-3 and the clamps 2-5 are extruded to form middle hammer heads 1-2;
then, the steel bar 1 forming the middle upset 1-2 is taken out, as shown in fig. 5, the hammer head 2-3 with the blind hole 2-3-1 is replaced by the hammer head 2-3 with a solid structure, the steel bar 1 is clamped in the clamp groove 2-5-1 by the clamp 2-5 driven by the clamp oil cylinder 2-4, the head end is propped against the end surface in front of the hammer head 2-3, different electric potentials are applied between the hammer head 2-3 and the clamp 2-5 again, short-circuit current flows through the steel bar 1, the steel bar 1 is heated and softened under the action of the current, the upset oil cylinder 2-1 drives the hammer head 2-3 to move forwards, the front end surface of the hammer head 2-3 and the clamp 2-5 are extruded to form a tail end upset, and then a steel bar product with the tail end upset 1-1 and the middle upset 1-2 is obtained.
The novel tensioning process comprises the following operation steps:
1. after the reinforcing steel bar 1 is cut at a fixed length, the reinforcing steel bar 1 is inserted into the bottom of a blind hole 2-3-1 of a hammer 2-3, then a heading instruction is sent to a control system, the control system firstly controls a clamp 2-5 driven by a clamping oil cylinder 2-4 to move towards the middle, the reinforcing steel bar 1 is clamped, and the reinforcing steel bar 1 is tightly clamped in a clamp groove 2-5-1;
2. different electric potentials are applied between the hammer heads 2-3 and the clamps 2-5 by a control system, short-circuit current flows on the steel bar 1, the steel bar 1 is heated and softened under the action of the current, then the forging oil cylinder 2-1 drives the hammer heads 2-3 to move forwards, and the deformation of the steel bar 1 in the blind holes 2-3-1 of the hammer heads 2-3 is limited, so that the steel bar 1 between the front end surfaces of the hammer heads 2-3 and the clamps 2-5 is extruded to form middle upset heads 1-2;
3. after a power supply 2-13 applied between the hammer heads 2-3 and the clamps 2-5 is disconnected by the control system, the hammer heads 2-3 are driven to retreat by the upsetting oil cylinder 2-1, then the clamps 2-5 driven by the clamping oil cylinder 2-4 move towards two sides, the reinforcing steel bars 1 are loosened, and the reinforcing steel bars 1 processed by the middle upset heads 1-2 are pulled out of the blind holes 2-3-1;
4. after the hammer heads 2-3 are replaced by solid hammer heads, the steel bar 1 with the middle upset head 1-2 towards the tail end direction of the steel bar 1 is placed in the middle of the fixture 2-5, the tail end of the steel bar 1 is abutted against the end face of the hammer heads 2-3, then an upset head instruction is sent to a control system, the control system firstly controls the fixture 2-5 driven by the clamping oil cylinder 2-4 to move towards the middle, the steel bar 1 is clamped, and the steel bar 1 is tightly clamped in the fixture groove 2-5-1;
5. the control system applies different potentials to the hammer heads 2-3 and the clamps 2-5 again, short-circuit current flows through the steel bar 1, the steel bar 1 is heated and softened under the action of the current, and then the forging oil cylinder 2-1 drives the hammer heads 2-3 to move forwards, so that the steel bar 1 between the front end surfaces of the hammer heads 2-3 and the clamps 2-5 is extruded to form a tail end upset head 1-1;
6. and the control system cuts off a power supply applied between the hammer heads 2-3 and the clamps 2-5, simultaneously the upsetting oil cylinder 2-1 drives the hammer heads 2-3 to retreat, then the clamps 2-5 driven by the clamping oil cylinder 2-4 move towards two sides, the reinforcing steel bars 1 are loosened, the reinforcing steel bars 1 after the processing of the tail end upset heads 1-1 are taken out, and thus the processing of the reinforcing steel bars 1 of the middle upset heads 1-2 and the tail end upset heads 1-1 is completed.
Example 3
1. After cutting the reinforcing steel bar 1 to a fixed length, putting the reinforcing steel bar 1 between symmetrically distributed reverse clamps 2-10 and symmetrically distributed clamps 2-5, and enabling the head end of the reinforcing steel bar 1 to be propped against hammerheads 2-3;
2. then sending an upset instruction, firstly moving a clamp 2-5 driven by a clamping oil cylinder 2-4 to the middle to clamp the steel bar 1, and tightly clamping the steel bar 1 in a clamp groove 2-5-1; meanwhile, the reverse clamp 2-10 driven by the reverse clamp clamping oil cylinder 2-12 moves towards the middle to clamp the steel bar 1, the steel bar 1 is tightly clamped in the reverse clamp 2-10 groove, and the reverse clamp 2-10 groove and the clamp groove 2-5-1 are arranged in the same direction and in the front-back direction and have the same structure;
3. the power supply 2-13 connects the hammer heads 2-3 with the reverse clamp 2-10 through the leads 2-14, when the steel bar 1 is contacted with the hammer heads 2-3 and the reverse clamp 2-10, different potentials are applied between the hammer heads 2-3 and the reverse clamp 2-10, short-circuit current flows on the steel bar 1, the steel bar 1 is heated and softened under the action of the current, and then the upsetting oil cylinder 2-1 drives the hammer heads 2-3 to move forwards, so that the steel bar 1 between the front end surface of the hammer heads 2-3 and the clamp 2-5 is extruded to form a tail end upset head 1-1; meanwhile, the reverse upsetting oil cylinder 2-9 drives the bottom plate 2-7 to move forwards on the longitudinal guide rail 2-8, the reverse clamp 2-10 correspondingly moves forwards because the reverse clamp 2-10 is arranged on the bottom plate 2-7, and the reinforcing steel bar 1 between the opposite surfaces of the reverse clamp 2-10 and the clamp 2-5 is extruded to form a middle upset head 1-2;
4. a power supply 2-13 applied between the hammer 2-3 and the reverse clamp 2-10 is disconnected, the upsetting oil cylinder 2-1 drives the hammer 2-3 to retreat, then the reverse clamp clamping oil cylinder 2-12 drives the reverse clamp 2-10 to move towards two sides, and after the reinforcing steel bar 1 is loosened, the reverse upsetting oil cylinder 2-9 retreats and drives the bottom plate 2-7 to retreat; the clamping oil cylinder 2-4 drives the clamp 2-5 to move towards two sides, the reinforcing steel bar 1 is loosened, and the equipment is restored to the initial state. At this time, the reinforcing bars 1, which have finished the processing of the end upsets 1-1 and the intermediate upsets 1-2, are taken out. And finishing the processing of the steel bar 1 of the middle heading 1-2 and the tail heading 1-1.
Example 4
The structure of the upset in the present invention may also be tapered (as shown in figure 8). The structure of the matched clamp is shown in fig. 9.
The fixture comprises a first fixture part 3-1 and a second fixture part 3-2 which are oppositely arranged, a groove 3-3 for clamping a reinforcing steel bar is arranged on the opposite surface of the first fixture part 3-1 and the second fixture part 3-2, and an upset head groove 3-4 matched with the shape of a conical upset head is arranged at one end, close to the hammer head, of the upper end of the groove 3-3; the end face of the hammer head corresponding to the clamp is provided with a countersunk hole 3-5.
The same heading grooves 3-4 are formed in 4 corners of the first clamp portion 3-1 and the second clamp portion 3-2, the first clamp portion 3-1 and the second clamp portion 3-2 horizontally rotate 180 degrees, or after the front and back sides of the first clamp portion 3-1 and the second clamp portion 3-2 are exchanged, the first clamp portion 3-1 and the second clamp portion 3-2 can be normally used.
The counter bores 3-5 are provided with a plurality of counter bores and are evenly distributed along the center of the hammer head.
By replacing the reverse clamps 2-10 and clamps 2-5 of example 2 with a clamp configuration as in figure 9, it is possible to achieve a tapered configuration for both the first and second upset configurations.
Fig. 10 is a schematic view of the assembly structure of the hammer head, the clamp and the reinforcing steel bar.
Fig. 11 is a schematic structural view of a counterbore.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
The invention is not limited to the specific technical solutions described in the above embodiments, and all technical solutions formed by equivalent substitutions are within the scope of the invention as claimed.
Claims (12)
1. The utility model provides a novel heading of enhancement mode precast pile which characterized in that: the steel bar (1) is provided with a tail end heading (1-1) and a middle heading (1-2).
2. The novel upset head of claim 1, wherein: the tail end upset head (1-1) and the middle upset head (1-2) are in any one of T-shaped or conical structures.
3. The novel upset head of claim 1, wherein: the distance between the tail end upset head (1-1) and the middle upset head (1-2) is 30-100 mm.
4. An upsetting machine for producing the novel upset head as claimed in claim 1 or 2, characterized in that: the heading machine (2) comprises a heading and calcining oil cylinder (2-1), a hammer head sleeve (2-2), a hammer head (2-3), a clamping oil cylinder (2-4) and a clamp (2-5); the upsetting oil cylinder (2-1), the hammer head sleeve (2-2) and the clamping oil cylinder (2-4) are fixed on the upsetting machine (2); the rod of the upsetting oil cylinder (2-1) is connected with the hammer head (2-3), and the hammer head (2-3) can slide back and forth in the hammer head sleeve (2-2); a blind hole (2-3-1) is formed in the hammer head (2-3), and the tail end of the steel bar (1) extends into the blind hole (2-3-1); the clamp (2-5) is connected with an oil cylinder rod of the clamping oil cylinder (2-4), and a clamp groove (2-5-1) is formed in the opposite surface; the power supply (2-13) electrically connects the hammer head (2-3) with the clamp (2-5) through a lead (2-14); the hammer heads (2-3) can be replaced and are of a solid structure or a structure with blind holes.
5. The heading machine according to claim 4, wherein: the clamping device is characterized by further comprising guide rails (2-6), the clamps (2-5) are installed on the guide rails (2-6), the number of the clamps (2-5) is 2, the number of the clamping oil cylinders (2-4) is 2 or 1, and the clamps (2-5) are driven by the clamping oil cylinders (2-4) to move left and right or fixed on one side along the guide rails (2-6).
6. The heading machine according to claim 4, wherein: the cross section of the hammer head (2-3) comprises a square shape, a circular shape or a polygonal shape, and the shape of the clamp groove (2-5-1) comprises an arc shape, a square angle shape or a polygonal shape.
7. The heading machine according to claim 4, wherein: when the hammer head (2-3) is of a structure with a blind hole, a certain included angle alpha is formed between the bevel edge of the hammer head blind hole (2-3-1) and the end face of the hammer head (2-3), and the included angle alpha ranges from 85 degrees to 90 degrees.
8. The heading machine according to claim 4, wherein: the clamps (2-5) and the hammers (2-3) are respectively connected to different potentials of the power supply (2-13), different potential differences exist between the clamps and the hammers, and short-circuit current flows on the steel bar (1) during heading.
9. The heading machine according to claim 4, wherein: the tail end heading device comprises a bottom plate (2-7), a longitudinal guide rail (2-8), a reverse upsetting oil cylinder (2-9), a reverse clamp (2-10), a reverse clamp guide rail (2-11) and a reverse clamp clamping oil cylinder (2-12); the reverse upsetting oil cylinder (2-9) drives the bottom plate (2-7) to move on the longitudinal guide rail (2-8), so that the reverse clamp (2-10) arranged on the driving bottom plate (2-7) is driven to move.
10. The heading machine according to claim 4, wherein the clamp comprises a first clamp part (3-1) and a second clamp part (3-2) which are oppositely arranged, the opposite surfaces of the first clamp part (3-1) and the second clamp part (3-2) are provided with grooves (3-3) for clamping the reinforcing steel bars, and one end of the upper end of each groove (3-3) close to the hammer head is provided with a heading groove (3-4) matched with the shape of the conical heading head;
the novel heading machine is characterized in that 4 corners of the first clamp portion (3-1) and the second clamp portion (3-2) are provided with the same heading grooves (3-4), the first clamp portion (3-1) and the second clamp portion (3-2) rotate horizontally for 180 degrees, or the front and back surfaces of the first clamp portion (3-1) and the second clamp portion (3-2) are exchanged, and the first clamp portion (3-1) and the second clamp portion (3-2) can be normally used.
11. A method of producing a new heading using the heading machine as claimed in any one of claims 4 to 10, characterized in that: the novel heading is manufactured by clamping and fixing the steel bar (1) on a heading machine (2); the method comprises the following specific steps:
the steel bar heading machine has the advantages that a hammer head (2-3) with a blind hole structure is mounted on a heading machine (2), a steel bar (1) with a certain length is inserted into the bottom of the blind hole (2-3-1) of the hammer head (2-3), then a heading instruction is sent to a control system, the control system firstly controls a clamp (2-5) driven by a clamping oil cylinder (2-4) to move towards the middle, and the steel bar (1) is clamped in a clamp groove (2-5-1);
the control system applies different electric potentials to the hammer heads (2-3) and the clamps (2-5), short-circuit current flows through the steel bars (1), the steel bars (1) are heated and softened under the action of the current, then the forging oil cylinders (2-1) drive the hammer heads (2-3) to move forwards, and the steel bars (1) between the front end surfaces of the hammer heads (2-3) and the clamps (2-5) are extruded to form middle hammer heads (1-2) due to the fact that the deformation of the steel bars (1) in the blind holes (2-3-1) of the hammer heads (2-3) is limited;
the power supply applied between the hammer heads (2-3) and the clamps (2-5) is disconnected by the control system, meanwhile, the hammer heads (2-3) are driven to retreat by the upsetting oil cylinder (2-1), then the clamps (2-5) driven by the clamping oil cylinder (2-4) move towards two sides, the reinforcing steel bars (1) are loosened, and the reinforcing steel bars (1) processed by the middle upset heads (1-2) are pulled out of the blind holes (2-3-1);
replacing a hammer head (2-3) with a solid structure in the heading machine (2), placing a part from a middle heading head (1-2) to the nearest tail end of the steel bar (1) in the middle of the clamp (2-5), and enabling the tail end of the steel bar (1) to abut against the end face of the hammer head (2-3); then sending an upset instruction to a control system, wherein the control system firstly controls a clamp (2-5) driven by a clamping oil cylinder (2-4) to move towards the middle, and clamps the reinforcing steel bar (1) in a clamp groove (2-5-1);
the control system applies different potentials to the hammer heads (2-3) and the clamps (2-5) again, short-circuit current flows through the steel bars (1), the steel bars (1) are heated and softened under the action of the current, then the upsetting oil cylinder (2-1) drives the hammer heads (2-3) to move forwards, and therefore the steel bars (1) between the front end faces of the hammer heads (2-3) and the clamps (2-5) are extruded to form tail end upset heads (1-1);
sixthly, the control system cuts off a power supply applied between the hammer head (2-3) and the clamp (2-5), the upsetting oil cylinder (2-1) drives the hammer head (2-3) to retreat, then the clamp (2-5) driven by the clamping oil cylinder (2-4) moves towards two sides, the reinforcing steel bar (1) is loosened, the reinforcing steel bar (1) processed by the tail end heading head (1-1) is taken out, and the processing of the reinforcing steel bar (1) of the middle heading head (1-2) and the tail end heading head (1-1) is completed.
12. A method of producing a new heading using the heading machine of claim 10, characterized by: the novel heading is manufactured by clamping and fixing the steel bar (1) on a heading machine (2); the method comprises the following specific steps:
firstly, after steel bars (1) are cut to a fixed length, the steel bars (1) are placed between symmetrically distributed reverse clamps (2-10) and symmetrically distributed clamps (2-5), and the head ends of the steel bars (1) are pressed against hammer heads (2-3);
secondly, sending an upset instruction, moving the clamps (2-5) driven by the clamping oil cylinders (2-4) to the middle to clamp the reinforcing steel bars (1), and tightly clamping the reinforcing steel bars (1) in the clamp grooves (2-5-1); meanwhile, the reverse clamp (2-10) driven by the reverse clamp clamping oil cylinder (2-1)2 moves towards the middle to clamp the steel bar (1), the steel bar (1) is tightly clamped in the groove of the reverse clamp (2-10), and the groove of the reverse clamp (2-10) and the groove of the clamp (2-5-1) are arranged in the same direction and in the front and back direction and have the same structure;
the power supply (2-13) connects the hammer heads (2-3) with the reverse clamp (2-10) through the leads (2-14), after the steel bar (1) is contacted with the hammer heads (2-3) and the reverse clamp (2-10), different potentials are applied between the hammer heads (2-3) and the reverse clamp (2-10), short-circuit current flows on the steel bar (1), the steel bar (1) is heated and softened under the action of the current, and then the upsetting oil cylinder (2-1) drives the hammer heads (2-3) to move forwards, so that the steel bar (1) between the front end face of the hammer heads (2-3) and the clamp (2-5) is extruded to form a tail end upset head (1-1); meanwhile, the reverse upsetting oil cylinder (2-9) drives the bottom plate (2-7) to move forwards on the longitudinal guide rail (2-8), the reverse clamp (2-10) moves forwards correspondingly as the reverse clamp (2-10) is installed on the bottom plate (2-7), and the reinforcing steel bar (1) between the opposite surfaces of the reverse clamp (2-10) and the clamp (2-5) is extruded to form a middle upset head (1-2);
a power supply (2-13) applied between the hammer head (2-3) and the reverse clamp (2-10) is disconnected, the hammer head (2-3) is driven to retreat by the upsetting oil cylinder (2-1), then the reverse clamp clamping oil cylinder (2-12) drives the reverse clamp (2-10) to move towards two sides, after the reinforcing steel bar (1) is loosened, the reverse upsetting oil cylinder (2-9) retreats, and the bottom plate (2-7) is driven to retreat; the clamping oil cylinder (2-4) drives the clamp (2-5) to move towards two sides, the reinforcing steel bar (1) is loosened, and the equipment is restored to the initial state; at the moment, the reinforcing steel bar (1) processed by the tail end heading (1-1) and the middle heading (1-2) is taken out; and finishing the processing of the steel bar (1) of the middle heading (1-2) and the tail heading (1-1).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113172750A (en) * | 2021-04-12 | 2021-07-27 | 建华建材（中国）有限公司 | Tensioning device and tensioning process for enhanced precast pile |
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| CN113145772B (en) | 2023-09-05 |
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