CN116079887A - Production process of prestressed and partially prestressed electric pole - Google Patents
Production process of prestressed and partially prestressed electric pole Download PDFInfo
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- CN116079887A CN116079887A CN202310129759.9A CN202310129759A CN116079887A CN 116079887 A CN116079887 A CN 116079887A CN 202310129759 A CN202310129759 A CN 202310129759A CN 116079887 A CN116079887 A CN 116079887A
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- electric pole
- prestressed
- reinforcement cage
- pole
- concrete
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/02—Methods or machines specially adapted for the production of tubular articles by casting into moulds
- B28B21/10—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means
- B28B21/22—Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using rotatable mould or core parts
- B28B21/30—Centrifugal moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/12—Making special types or portions of network by methods or means specially adapted therefor
- B21F27/121—Making special types or portions of network by methods or means specially adapted therefor of tubular form, e.g. as reinforcements for pipes or pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B21/00—Methods or machines specially adapted for the production of tubular articles
- B28B21/56—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts
- B28B21/60—Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention belongs to the technical field of electric poles, and particularly relates to a production process of a prestressed and partially prestressed electric pole. Which comprises the following steps: 1) Uniformly distributing and tightening main steel bars in the steel bar framework according to the designed positions, and then placing the main steel bars in a positioning die according to preset intervals; 2) Automatically winding the spiral bars on main steel bars of the steel bar framework according to preset intervals to form a steel bar cage; 3) Binding the main steel bars and the spiral steel bars in the steel bar framework firmly through binding wires, and removing the positioning die after the binding is completed; 4) Binding and fixing mortar cushion blocks on main reinforcements of the reinforcement cage; 5) The reinforcement cage is arranged in the lower mold of the electric pole, and the upper mold of the electric pole and the lower mold of the electric pole are assembled and tightened to form the mold of the electric pole; 6) Stretching the reinforcement cage according to a preset stretching force; 7) Pouring the mixed concrete into an electric pole mould; 8) Carrying out centrifugal forming and curing treatment on the reinforcement cage filled with concrete to obtain a cured concrete pole; 9) And demolding the well-maintained concrete electric pole.
Description
Technical Field
The invention belongs to the technical field of electric poles, and particularly relates to a production process of a prestressed and partially prestressed electric pole.
Background
The electric pole is widely used in China as a main carrier for electric power transmission. The existing production process of the prestressed and partially prestressed electric pole mainly comprises the steps of placing the manufactured reinforcement cage into a mould, feeding concrete, closing the mould, tensioning, centrifuging and maintaining, and is widely applied due to the simple production process. However, the production process mainly has the following defects:
1) The feeding process is relatively open, concrete is easy to spill in a feeding area in the feeding process, and dust is formed after the concrete is dried, so that the health protection of workers is not facilitated;
2) The main steel bars above the steel bar framework are often extruded towards the axle center by stones in the concrete in the feeding process, so that the quality defect that the protective layer exceeds the standard is caused;
3) After the framework of the steel reinforcement is filled with the concrete, the mould is closed again and the main steel reinforcement is tensioned (the method of feeding firstly and then closing the mould is tensioned), and the main steel reinforcement is constrained by the viscosity of the concrete and the dead weight in the tensioning process, so that the prestress loss is caused, and the actual tensioning force cannot meet the design requirement;
4) Because the loading mode is mold opening loading, concrete often falls on a tongue-and-groove of the steel mold, if the concrete is not cleaned up in time and then is closed, extrusion damage can be caused to the steel mold, and irreversible damage is caused to the steel mold after long-term use; and because the concrete falls on the tongue-and-groove of the steel mould, gaps exist between the upper mould and the lower mould due to the obstruction of the concrete when the mould is closed, so that the quality defect of slurry leakage of the electric pole is caused in a centrifugal link of the electric pole;
5) The existing production process of the prestressed electric pole and part of the prestressed electric pole needs to arrange a erection ring every 1000mm in the steel reinforcement framework, meanwhile, because the erection ring is bound by using a binding process, the erection ring is manually aligned in a mould entering link, so that the erection ring is perpendicular to the central axis of the steel reinforcement framework, the link influences the time for mould entering adjustment of the steel reinforcement framework, the working efficiency is reduced, and the labor intensity of staff is increased.
Based on the above, research and development of a novel production process of prestressed and partially prestressed electric poles is urgently needed to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention provides a production process of a prestressed and partially prestressed electric pole, which is produced by closing a die, and the reinforcement cage is tensioned before, so that the working environment and the durability of the die are improved, the quality of the electric pole is improved, and the thickness uniformity of a protective layer of the electric pole can be ensured.
The invention adopts the following technical scheme: the production process of the prestressed and partially prestressed electric pole comprises the following steps:
1) Uniformly distributing and tightening main steel bars in the steel bar framework according to the designed positions, and then placing the main steel bars in a positioning die according to preset intervals;
2) Automatically winding the spiral bars on main steel bars of the steel bar framework according to preset intervals to form a steel bar cage;
3) Binding the main steel bars and the spiral steel bars in the steel bar framework firmly through binding wires, and removing the positioning die after the binding is completed;
4) Binding and fixing mortar cushion blocks on main reinforcements of the reinforcement cage;
5) The reinforcement cage is arranged in the lower mold of the electric pole, and the upper mold of the electric pole and the lower mold of the electric pole are assembled and tightened to form the mold of the electric pole;
6) Stretching the reinforcement cage according to a preset stretching force;
7) Pouring the mixed concrete into an electric pole mould;
8) Carrying out centrifugal forming and curing treatment on the reinforcement cage filled with concrete to obtain a cured concrete pole;
9) And demolding the well-maintained concrete electric pole.
Further, in step 5), after the reinforcement cage is installed in the lower mold of the electric pole, the reinforcement cage is adjusted so that the main reinforcement in the reinforcement cage is arranged straight.
Further, after the step 6) is completed, the electric pole mold is inclined by 20-45 degrees according to a preset angle.
Further, in step 7), the mixed concrete is flowed in from the large opening end of the pole mold, so that the mixed concrete naturally flows to the small opening end of the pole mold along the reinforcement cage, and then the pole mold is placed in a leveling manner, so that the concrete naturally levels in the pole mold.
Further, in step 1), the distance between adjacent positioning dies is 800mm to 1200mm.
Furthermore, the positioning die is annular and is made of steel plates, and a plurality of main reinforcement positioning holes corresponding to the positions of main reinforcements in the reinforcement cage are formed in the outer edge of the positioning die in the circumferential direction.
Further, in the step 8), the centrifugal rotational speed is 320 to 500r/min during the centrifugal molding treatment.
Compared with the prior art, the invention has the beneficial effects that:
according to the production process of the prestressed and partially prestressed electric pole, the main steel bars in the steel bar framework are uniformly distributed and tensioned according to the design positions, the winding of the later spiral bars is facilitated, the winding force of the spiral bars is moderate, the supporting effect of the positioning die is utilized, the shrinkage of the steel bar framework in the winding process is avoided, and therefore the quality of the protective layer of the electric pole can be better ensured. Meanwhile, the prestress and partial prestress electric pole production process ensures that the positions of the main reinforcements are not deviated when the reinforcement cage is formed and the spiral reinforcements are wound through the matching use of the positioning mold, and the use of the stand ring is eliminated, so that the material cost and the labor intensity of workers are reduced, and the production efficiency is improved. In addition, because the pole mould of production pole probably has certain size deviation, and has cancelled the rigid support effect of frame upright circle, makes the steel reinforcement cage softer to make the steel reinforcement cage adapt to the size deviation of pole mould more, and then can effectively guarantee the homogeneity of pole protective layer.
And the post-tensioning operation mode of feeding firstly and then die closing tensioning in the prior art is replaced by: firstly, the reinforcement cage is put into a lower mould of the electric pole, and then the pretensioning operation mode of mould closing, tensioning, concrete filling, centrifugation and maintenance is carried out. The production process of stretching and feeding is adopted, the reinforcement cage is stretched, the reinforcement is stretched and fed, the problem of position deviation of the main reinforcement is solved, prestress loss caused by the influence of concrete viscosity in stretching after feeding is avoided, and the quality problem of slurry leakage caused by the fact that the mould cannot be closed due to the fact that concrete falls into a groove of the mould is avoided due to the fact that the mould on the electric pole is matched with the mould on the electric pole and then fed. Therefore, the steel bar cage is produced by closing the mould, and the steel bar cage is tensioned before, so that the working environment and the durability of the mould are improved, the quality of the electric pole is improved, and the thickness uniformity of the protective layer of the electric pole can be ensured.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a reinforcement cage structure when the frameless stand ring is used in an embodiment of the invention;
fig. 2 is a schematic structural view of a positioning mold in the reinforcement cage according to the present invention;
wherein: a reinforcement cage 1; positioning die 2 and main reinforcement positioning hole 20; fixing a mortar cushion block 3; spiral ribs 4.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The invention is discussed in detail below in conjunction with fig. 1-2 and the specific embodiments:
as shown in fig. 1-2, the present invention provides a process for producing prestressed and partially prestressed electric poles, comprising the steps of:
1) Uniformly distributing and tightening main reinforcements in the reinforcement cage according to the design position, and then placing the main reinforcements in the reinforcement cage into a positioning mold 2 according to a preset interval; specifically, tension is applied to two ends of the steel reinforcement framework to tighten the steel reinforcement framework, and the specific applied tension is designed by a person skilled in the art according to actual conditions, so that the invention is not limited specifically;
2) Automatically winding the spiral bars 4 on main steel bars of the steel bar framework according to preset intervals to form a steel bar cage 1; preferably, the winding process can complete the winding of the spiral rib 4 through a winding machine, the winding efficiency is high, the winding stability is good, the shrinkage of the reinforcement cage in the winding process is avoided, and the quality of the protective layer of the electric pole is ensured;
3) Binding the main steel bars and the spiral steel bars in the steel bar framework firmly through binding wires, and removing the positioning die 2 after the binding is completed;
4) Binding and fixing a mortar cushion block 3 on a main steel bar of the steel bar framework; the placement position, the size and the like of the fixed mortar cushion block 3 are designed and selected by a person skilled in the art according to actual conditions, the corresponding fixed mortar cushion block 3 is fixed on a main steel bar of a steel bar framework and is positioned between the main steel bar and an electric pole mould, so that the height of the fixed mortar cushion block 3 is equal to the thickness of a protective layer of an electric pole, and the thickness of the protective layer of the electric pole can be well ensured by the arrangement of the fixed mortar cushion block; as in the present embodiment, the fixed mortar pad blocks 3 are uniformly arranged at equal intervals;
5) The reinforcement cage 1 is arranged in the lower pole mould, and the upper pole mould and the lower pole mould are assembled and tightened to form the pole mould;
6) Stretching the reinforcement cage according to a preset stretching force; specifically, when the stretching process of the reinforcement cage is carried out, the preset tensile stress can be designed by referring to the standard value of the tensile strength of the reinforcement, so that the standard requirement is met, the stretching time is matched with the equipment capacity, and the like, and the stretching process is specifically designed by a person skilled in the art according to the actual situation;
7) Pouring the mixed concrete into an electric pole mould;
8) Carrying out centrifugal forming and curing treatment on the reinforcement cage filled with concrete to obtain a cured concrete pole; in the embodiment, during the centrifugal molding treatment in the step 8), the centrifugal rotating speed is 320-500 r/min, and the high-speed centrifugal treatment is performed, so that the technological process is shortened; and in the same way, the maintenance treatment system can be determined according to the test conditions of the used raw materials, equipment and the like;
9) And demolding the well-maintained concrete electric pole to finish the manufacturing of the electric pole.
According to the production process of the pre-stressed and partially pre-stressed electric pole, the main steel bars in the steel bar framework are uniformly distributed and tensioned according to the design positions, so that the subsequent winding of the spiral bars is facilitated, the winding force of the spiral bars is moderate, the shrinkage of the steel bar framework in the winding process is avoided, and the quality of the protective layer of the electric pole can be better ensured. Meanwhile, the prestress and partial prestress electric pole production process ensures that the positions of the main reinforcements are not deviated when the reinforcement cage is formed and the spiral reinforcements are wound through the matching use of the positioning die 2, and the use of the erection ring is canceled, so that the material cost and the labor intensity of workers are reduced, and the production efficiency is improved. In addition, along with the increase of pole mould size (including diameter, length, general pole mould's length has 6m ~ 15 m), lead to the pole mould to appear certain size deviation easily, and cancelled the rigid support effect of erecting the circle, make the steel reinforcement cage softer to make the steel reinforcement cage adapt to the size deviation of pole mould more, and then can effectively guarantee the homogeneity of pole protective layer.
And the post-tensioning operation mode of feeding firstly and then die closing tensioning in the prior art is replaced by: firstly, a reinforcement cage is put into a lower mould of the electric pole, and then the pretensioning operation mode of mould closing, tensioning, concrete filling, centrifugation and maintenance is carried out; the production process of stretching and feeding is adopted, the reinforcement cage is stretched, the reinforcement is stretched and fed, the problem of position deviation of the main reinforcement is solved, prestress loss caused by the influence of concrete viscosity in stretching after feeding is avoided, and the quality problem of slurry leakage caused by the fact that the mould cannot be closed due to the fact that concrete falls into a groove of the mould is avoided due to the fact that the mould on the electric pole is matched with the mould on the electric pole and then fed. Therefore, the steel bar cage is produced by closing the mould, and the steel bar cage is tensioned before, so that the working environment and the durability of the mould are improved, the quality of the electric pole is improved, and the thickness uniformity of the protective layer of the electric pole can be ensured.
In addition, the forming time of each pole reinforcement cage is shortened by about 3 minutes by adopting the pole produced by the production process of the pre-stress pole and part of pre-stress pole, so that the use of a stand ring is eliminated, and the material cost is greatly reduced; and each pole saves 2 minutes in the adjustment link after the reinforcement cage is put into the mould. Concrete naturally flows in from the large opening end of the electric pole mould in the feeding process, so that the manual material collecting link of personnel is reduced, the labor intensity of personnel is reduced, the production efficiency is improved, and concrete is prevented from scattering in a feeding area after mould closing, so that environmental pollution is avoided; meanwhile, due to the closed feeding, the joint leakage caused by the gap when the concrete falls on the tongue and groove of the steel mould to be closed is reduced.
Further, in step 5), after the reinforcement cage is installed in the lower mold of the electric pole, the reinforcement cage is adjusted so that the main reinforcement in the reinforcement cage is arranged straight, so as to ensure the thickness of the main reinforcement protection layer.
Further, after step 6) is completed, the electric pole mold is inclined at a preset angle, and correspondingly, the electric pole mold is inclined by about 20-45 degrees. And in the step 7), the mixed concrete flows in from the large opening end of the pole mould, so that the mixed concrete naturally flows to the small opening end of the pole mould along the reinforcement cage, and then the pole mould is placed in a leveling mode, so that the concrete naturally levels in the pole mould. The feeding process of concrete is that the concrete flows in from the large opening end of the pole mould, naturally flows to or is injected into the small opening end of the pole mould through pumping, and because the pole is longer and the common plastic concrete has viscosity, the concrete is not easy to reach the two ends of the reinforcement cage, the feeding mode can enable the concrete to smoothly flow to the two ends of the reinforcement cage, the weight of the concrete is ensured, and the wall thickness of the pole is ensured to be uniform and meet the requirements.
Further, in step 1), the distance between adjacent positioning dies 2 is 800mm to 1200mm. In this embodiment, the distance between adjacent positioning dies 2 is 1000mm.
The positioning die 2 is annular and is made of steel plates, and a plurality of main reinforcement positioning holes 20 corresponding to the positions of main reinforcements in the reinforcement cage are formed in the outer edge of the positioning die 2 in the circumferential direction and are used for positioning the main reinforcements in the reinforcement cage. The effect of positioning die 2 is fixed shape mainly, because of spiral muscle coiling on the framework of steel reinforcement, this in-process spiral muscle will have a pulling force to the framework of steel reinforcement, also will tighten up the framework of steel reinforcement and make the cross section size of framework of steel reinforcement reduce, influences the protective layer of main reinforcing bar, and positioning die 2's setting can guarantee that the cross section size of framework of steel reinforcement does not reduce because of the atress, and positioning die 2 can demolish after the spiral muscle is around the ligature firmly.
The existing production process of the prestressed electric pole and part of the prestressed electric pole needs to arrange a stand ring every 1000mm in the steel reinforcement framework, and therefore, the use of the stand ring is omitted in the production process of the prestressed electric pole and part of the prestressed electric pole, the effect of guaranteeing the quality of the electric pole can be achieved, the use of the stand ring is omitted, the material cost and the labor cost are reduced, and meanwhile, the link of adjusting the stand ring by workers is omitted. In addition, every 1000mm sets up a positioning die 2 during the steel reinforcement cage shaping for the position of fixed main reinforcing bar, positioning die 2 uses the steel sheet to cut according to the shape of design and forms, in order to guarantee the intensity of positioning die 2, non-deformable, and this positioning die 2 demolishs and repeatedly usable after the steel reinforcement cage shaping, practices thrift the cost.
The invention also carries out mechanical property test on the electric pole manufactured by adopting the prestress and partial prestress electric pole production process, namely the frameless vertical ring electric pole, and specific test original data records are shown in tables 1 and 2:
table 1 mechanical properties test raw data recording table 1 for the frameless vertical coil pole
Table 2 mechanical property test raw data recording table two for the frameless vertical ring pole
From the recorded data in tables 1 and 2, the mechanical properties such as crack resistance, bearing capacity and deflection of the electric pole prepared by adopting the mode that the reinforcement cage is tensioned before and the feeding is after all meet the requirements of the electric pole preparation, and the thickness uniformity of the protective layer is good, in the embodiment, the thickness uniformity is 22mm. Not only improves the quality of the electric pole, but also ensures the uniformity of the thickness of the protective layer of the electric pole.
The invention has been further described with reference to specific embodiments, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the invention, but rather as providing those skilled in the art with the benefit of this disclosure with the benefit of their various modifications to the described embodiments.
Claims (7)
1. A production process of a prestressed and partially prestressed electric pole is characterized in that: the method comprises the following steps:
1) Uniformly distributing and tightening main steel bars in the steel bar framework according to the designed positions, and then placing the main steel bars in a positioning die according to preset intervals;
2) Automatically winding the spiral bars on main steel bars of the steel bar framework according to preset intervals to form a steel bar cage;
3) Binding the main steel bars and the spiral steel bars in the steel bar framework firmly through binding wires, and removing the positioning die after the binding is completed;
4) Binding and fixing mortar cushion blocks on main reinforcements of the reinforcement cage;
5) The reinforcement cage is arranged in the lower mold of the electric pole, and the upper mold of the electric pole and the lower mold of the electric pole are assembled and tightened to form the mold of the electric pole;
6) Stretching the reinforcement cage according to a preset stretching force;
7) Pouring the mixed concrete into an electric pole mould;
8) Carrying out centrifugal forming and curing treatment on the reinforcement cage filled with concrete to obtain a cured concrete pole;
9) And demolding the well-maintained concrete electric pole.
2. The prestressed and partially prestressed electric pole manufacturing process of claim 1, wherein:
in the step 5), after the reinforcement cage is installed in the lower mold of the electric pole, the reinforcement cage is adjusted so that the main reinforcement in the reinforcement cage is arranged flatly.
3. The prestressed and partially prestressed electric pole manufacturing process of claim 1, wherein:
and after the step 6) is completed, tilting the electric pole die by 20-45 degrees according to a preset angle.
4. The prestressed and partially prestressed electric pole manufacturing process of claim 1, wherein:
in step 7), the mixed concrete flows in from the large opening end of the pole mould, so that the concrete naturally flows to the small opening end of the pole mould along the reinforcement cage, and then the pole mould is placed in a leveling mode, so that the concrete naturally levels in the pole mould.
5. The prestressed and partially prestressed electric pole manufacturing process of claim 1, wherein:
in the step 1), the distance between the adjacent positioning dies is 800 mm-1200 mm.
6. The prestressed and partially prestressed electric pole manufacturing process of claim 5, wherein:
the positioning die is annular and is made of steel plates, and a plurality of main reinforcement positioning holes corresponding to the positions of main reinforcements in the reinforcement cage are formed in the outer edge of the positioning die in the circumferential direction.
7. The prestressed and partially prestressed electric pole manufacturing process of claim 1, wherein:
in the step 8), the centrifugal rotational speed is 320-500 r/min during the centrifugal molding treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129759.9A CN116079887A (en) | 2023-02-17 | 2023-02-17 | Production process of prestressed and partially prestressed electric pole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310129759.9A CN116079887A (en) | 2023-02-17 | 2023-02-17 | Production process of prestressed and partially prestressed electric pole |
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| CN116079887A true CN116079887A (en) | 2023-05-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310129759.9A Pending CN116079887A (en) | 2023-02-17 | 2023-02-17 | Production process of prestressed and partially prestressed electric pole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118065562A (en) * | 2024-04-03 | 2024-05-24 | 泰安市汶河水泥制品有限公司 | Large bending moment concrete pole steel reinforcement cage structure and processing device |
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2023
- 2023-02-17 CN CN202310129759.9A patent/CN116079887A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118065562A (en) * | 2024-04-03 | 2024-05-24 | 泰安市汶河水泥制品有限公司 | Large bending moment concrete pole steel reinforcement cage structure and processing device |
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