CN111975981B - End stretching device for prefabricated part - Google Patents
End stretching device for prefabricated part Download PDFInfo
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- CN111975981B CN111975981B CN202010736881.9A CN202010736881A CN111975981B CN 111975981 B CN111975981 B CN 111975981B CN 202010736881 A CN202010736881 A CN 202010736881A CN 111975981 B CN111975981 B CN 111975981B
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 90
- 239000010959 steel Substances 0.000 claims abstract description 90
- 230000002787 reinforcement Effects 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims description 57
- 239000011440 grout Substances 0.000 claims description 45
- 239000002002 slurry Substances 0.000 claims description 12
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 abstract description 46
- 239000000463 material Substances 0.000 abstract description 18
- 239000011241 protective layer Substances 0.000 abstract description 11
- 238000000034 method Methods 0.000 description 14
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 239000011178 precast concrete Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
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Classifications
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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
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/41—Connecting devices specially adapted for embedding in concrete or masonry
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses an end tensioning device of a prefabricated part, wherein the prefabricated part comprises a concrete main body and prestressed steel bars, the prestressed steel bars are positioned in the concrete main body and extend along the axial direction of the concrete main body, the end of the concrete main body is provided with a sinking platform, the end of the prestressed steel bars is positioned in the sinking platform, and an anticorrosive material is filled in the sinking platform to wrap the prestressed steel bars positioned in the sinking platform. The sinking platform at the end part of the prefabricated part forms a cavity, the end part of the prestressed reinforcement is sunk in the sinking platform at the end part of the prefabricated part, the cavity in the sinking platform is filled with an anticorrosive material, after the prefabricated part is maintained to reach the standard strength, the end part reinforcement of the prefabricated part has a completely sufficient protective layer, the end part anticorrosive performance of the prefabricated part can be ensured, the concrete durability of the end part of the prefabricated part is greatly improved, the purpose that the reinforcement protective layer reaches the national standard is completely realized, and the standard blank and the technical blank are filled.
Description
Technical Field
The invention relates to the technical field of tensioning of prefabricated parts, in particular to an end tensioning device of a prefabricated part.
Background
The prefabricated parts refer to various parts manufactured by a pre-molding method. The pre-formed components are typically completed at a specialized factory and then shipped to a site for use. The concept of concrete prefabricated elements is most widely used among prefabricated elements, and in the field of construction, the prefabricated elements are generally equal to reinforced concrete prefabricated elements or precast concrete.
In the actual use process of the prefabricated part, the end face steel bars of the prefabricated part are often exposed in the external environment, so that the prefabricated part is often required to be subjected to anticorrosion treatment. For example, the steel bar is cut off on the end plane of the prefabricated part and the section of the steel bar is coated with anticorrosive material, such as prestressed electric pole, but the anticorrosive mode can only be used for surface anticorrosion, and the anticorrosive time and anticorrosive effect are not ideal; or the prestressed precast pile with the end plate, the underground end plate and the steel bar upset head of the precast pile are exposed in underground soil, the steel bar sleeve nut of the prestressed precast pile head without the end plate is also exposed in the underground soil, the steel bar at the end part of the prestressed precast beam column in the fabricated building is also exposed in the air, even if the surface of the steel bar is coated with an anticorrosive material, only a layer is shallow, and the joint surface of the steel bar and the concrete still has a gap, so that the end part concrete of the precast member has poor durability and poor anticorrosive effect. It can be seen that, in the prestressed precast concrete pole, the prestressed precast concrete pile, the prestressed beam column part in the PC member, etc., the steel bars at the end of the precast member have little anticorrosion protection or are still difficult to be anticorrosion after anticorrosion measures are taken, the durability of the end of the precast member and the service life of the precast member are seriously affected, and especially under the geological condition with strong corrosivity in coastal areas or in coastal air, the steel bars at the end of the precast member corrode more quickly, which brings great hidden troubles to the engineering quality.
The above description is included in the technical recognition scope of the inventors, and does not necessarily constitute the prior art.
Disclosure of Invention
In order to solve the problems, the invention aims to provide an end part tensioning device of a prefabricated part, and the prefabricated part manufactured by adopting the tensioning device and the tensioning method has the advantages that because the end part steel bars of the prefabricated part are all sunken in the sinking platform at the end part, after anticorrosive materials are adopted to fill the cavity in the sinking platform, after the prefabricated part is maintained to reach the standard strength, the end part steel bars of the prefabricated part have completely enough protective layers, the end part anticorrosive performance of the prefabricated part can be ensured, the concrete durability of the end part of the prefabricated part is greatly improved, the purpose that the steel bar protective layers reach the national standard is completely realized, and the standard blank and the technical blank are filled.
In order to achieve the above object, in a first aspect, the present invention provides a prefabricated component, which includes a concrete main body and prestressed reinforcements, where the prestressed reinforcements are located inside the concrete main body and extend along an axial direction of the concrete main body, an end of the concrete main body has a sunken table, an end of the prestressed reinforcement is located in the sunken table, and an interior of the sunken table is filled with an anticorrosive material to wrap the prestressed reinforcement located in the sunken table. The sinking platform at the end part of the prefabricated part forms a cavity, the end part of the prestressed reinforcement is sunk in the sinking platform at the end part of the prefabricated part, the cavity in the sinking platform is filled with an anticorrosive material, after the maintenance of the prefabricated part reaches the standard strength, the end part reinforcement of the prefabricated part has a completely sufficient protective layer, the end part anticorrosive performance of the prefabricated part can be ensured, the concrete durability of the end part of the prefabricated part is greatly improved, and the anticorrosive performance of the prefabricated part is better than that of other members even in deep underground corrosive environment. Because the end reinforcing steel bars of the prefabricated part are all sunk in the sinking platforms at the ends, the prestressed electric pole does not need to cut the reinforcing steel bars on the end face of the part any more, the reinforcing steel bar protective layer can completely reach the national standard, and the standard blank and the technical blank are filled.
In one example, the corrosion protection material is provided as expanded cement mortar. The volume of the expanded cement mortar is not contracted and slightly expanded in the hardening process, so that micro cracks are not generated, the compactness and the impermeability are better, the reinforcing steel bars in the sinking platform can be better protected, and the end corrosion resistance of the prefabricated part can be ensured.
In a second aspect, the invention further provides an end stretching device of the prefabricated part, which comprises a connecting piece, a stretching piece and a slurry sealing structure, wherein the connecting piece is used for connecting the stretching piece and the end of the prestressed reinforcement, and the slurry sealing structure is wrapped on the outer side of the connecting piece. Need carry out the stretch-draw to the reinforcing bar when preparation prefabricated component, during the stretch-draw reinforcing bar, couple together the end connection of stretch-draw piece and reinforcing bar through the connecting piece, and adopt and seal the thick liquid structure and wrap up the connecting piece, adopt the stretch-draw machine to need carry out pouring of concrete after applying the tensile force to the tip of reinforcing bar through the stretch-draw piece, in pouring the in-process, the thick liquid structure that seals who wraps up the connecting piece protects the connecting piece, prevent concrete and connecting piece contact, avoid the connecting piece to be poured inside the concrete, therefore, during the pouring concrete, the tip of prestressing steel is crossed to the tip of concrete, the existence that seals the thick liquid structure makes the tip of concrete main part form sunken heavy platform and the tip of prestressing steel is located sunken heavy platform just, whole prestressing steel all is located within the tip of concrete main part. After the prefabricated part manufactured by the tensioning device is filled with the cavity in the sinking platform by the anticorrosive material, the steel bars at the end part of the prefabricated part have a completely sufficient protective layer, the anticorrosive performance of the end part of the prefabricated part can be ensured, and the concrete durability of the end part of the prefabricated part is greatly improved.
In one example, the connecting piece sets up to the steel reinforcement sleeve, the steel reinforcement sleeve has seted up the fixed slot, steel reinforcement sleeve's inner wall one end has the screw thread, the other end have protrusion in the butt portion of steel reinforcement sleeve's inner wall, the tip of prestressing steel can pass through the fixed slot get into in the steel reinforcement sleeve and with butt portion butt. The common form of tip of prestressing steel is the pier nose, through setting up the connecting piece into the steel bar sleeve who opens there is the fixed slot, can stretch into steel bar sleeve with the tip pier nose structure of prestressing steel through the fixed slot in, the tensioning piece is when passing through connecting piece stretch-draw prestressing steel, the pier nose structure of expansion is inside back and the inseparable butt of butt portion at steel bar sleeve, butt portion can prevent prestressing steel's pier nose structure slippage from steel bar sleeve, guarantee that the connecting piece can transmit power for prestressing steel steadily when stretch-draw.
In one example, tensioning equipment still includes the retaining member, stretches into at the tip of prestressing steel under the state in the steel sleeve, the retaining member hoop is fixed in steel sleeve's lateral surface with locking prestressing steel with steel sleeve. The retaining member can set up to lock nut isotructure, and the retaining member can strengthen the telescopic intensity of reinforcing bar, avoids the reinforcing bar to be drawn and takes off, guarantees stretching device intensity and stability when stretch-draw.
In one example, the tensioning member is provided as a tensioning screw which is capable of extending into the sleeve and engaging the thread. The tensioning screw is simple in structure and can be directly matched with the steel bar sleeve through threads, one end of the tensioning screw is screwed into the steel bar sleeve through the threads, the steel bar sleeve and the tensioning screw are stably connected, the connection strength is high, and the connection and disassembly process is simple.
In one example, the grout sealing structure comprises a circumferential grout sealing structure and a side grout sealing structure, the circumferential grout sealing structure is wrapped on the outer side of the connecting piece, the side grout sealing structure is an annular structure, the inner side face of the side grout sealing structure is abutted to the prestressed steel bars, and the outer side face of the side grout sealing structure is abutted to the circumferential grout sealing structure. The annular slurry sealing structure wraps the side face of the connecting piece, and after concrete is poured, the annular slurry sealing structure can form the side wall of the sinking platform; the side surface slurry sealing structure is an annular structure, a hole in the middle of the side surface slurry sealing structure is mainly convenient for a steel bar to pass through, the side surface slurry sealing structure wraps the end surface of one end, close to the prestressed steel bar, of the connecting piece, and the existence of the side surface slurry sealing structure can form the bottom wall of the sinking platform; the annular slurry sealing structure and the side slurry sealing structure jointly wrap the connecting piece so as to avoid the contact of concrete and the connecting piece during pouring, so that the end face of the prefabricated part can form a sinking platform.
In one example, the circumferential grout structure is provided as a rubber ring; the side surface pulp sealing structure is sponge. The rubber ring and the sponge are common materials, so that the purpose can be achieved, and meanwhile, the manufacturing cost is reduced.
In a third aspect, the present invention further provides an end tensioning method for a prefabricated component, which uses the above end tensioning device, the method including:
(1) fixedly connecting the connecting piece to the end part of the prestressed reinforcement, and fixedly connecting the tensioning piece with the end part of the prestressed reinforcement through the connecting piece;
(2) and the connecting piece is wrapped by the sealing structure.
In one example, the step (1) is followed by: and fixing a locking piece on the outer side surface of the connecting piece in an annular manner so as to lock the prestressed reinforcement and the connecting piece.
Drawings
The drawings described herein are only for assisting those skilled in the art in understanding the technical solutions of the present invention, and the exemplary embodiments of the present invention described in conjunction with the drawings are only for explaining the technical solutions of the present invention and do not constitute a limitation of the present invention. In the drawings:
FIG. 1 is a cross-sectional view of a prefabricated unit according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of an end tensioning device for tensioning prestressed reinforcement according to an embodiment of the present invention;
fig. 3 is a partially enlarged cross-sectional view of an end tensioning device for tensioning a prestressed reinforcement according to an embodiment of the present invention.
List of reference numerals:
a prefabricated part 1; a concrete body 10 and a sinking platform 11; prestressed reinforcement 20, end 21; a corrosion preventing material 30; an end tensioning device 100; a connecting piece 110, a fixing groove 111, a thread 112, and a contact part 113; a tension member 120; a grout sealing structure 130, a circumferential grout sealing structure 131 and a side grout sealing structure 132; a retaining member 140.
Detailed Description
In order to more clearly explain the overall concept of the invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the indicated orientations and positional relationships based on the drawings for ease of description and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore 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 stated 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 formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. In the description of the present specification, reference to the description of the terms "one aspect," "some aspects," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the aspect or example is included in at least one aspect or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same solution or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more aspects or examples.
As shown in fig. 1, in a first aspect, the present invention firstly provides a prefabricated component 1, which includes a concrete body 10 and a prestressed reinforcement 20, wherein the prestressed reinforcement 20 is located inside the concrete body 10 and extends along an axial direction of the concrete body 10, an end portion of the concrete body 10 has a sunken platform 11, an end portion 21 of the prestressed reinforcement 20 is located inside the sunken platform 11, and an interior of the sunken platform 11 is filled with an anticorrosive material 30 to wrap the prestressed reinforcement 20 located inside the sunken platform 11. The sinking platform 11 at the end part of the prefabricated part 1 forms a cavity, the end part 21 of the prestressed reinforcement 20 is sunk in the sinking platform 11 at the end part of the prefabricated part 1, the cavity in the sinking platform 11 is filled with an anticorrosive material 30, after the prefabricated part 1 is maintained to reach the standard strength, the reinforcement at the end part of the prefabricated part 1 has a completely sufficient protective layer, the anticorrosive performance of the end part of the prefabricated part 1 can be ensured, the durability of the concrete at the end part of the prefabricated part 1 is greatly improved, and the anticorrosive performance of the prefabricated part is better than that of other members even in deep underground corrosive environment. Because the end reinforcing steel bars of the prefabricated part 1 are all sunk in the sinking platform 11 at the end, the prestressed electric pole does not need to cut the reinforcing steel bars on the end surface of the part any more, the reinforcing steel bar protective layer can completely reach the national standard, and the standard blank and the technical blank are filled.
In one embodiment, as shown in fig. 1, the anticorrosive material 30 is provided as expanded cement mortar. The expanded cement mortar does not shrink in volume and slightly expands in the hardening process, so that micro cracks are not generated, the compactness and the impermeability are better, the reinforcing steel bars 20 in the sinking platform 11 can be better protected, and the end corrosion resistance of the prefabricated part 1 can be ensured.
In a second aspect, as shown in fig. 2 to 3, the present invention further provides an end tensioning device 100 for a prefabricated part 1, which includes a connecting member 110, a tensioning member 120, and a grout sealing structure 130, wherein the connecting member 110 connects the tensioning member 120 with an end 21 of a prestressed reinforcement 20, and the grout sealing structure 130 is wrapped outside the connecting member 110. When the pre-fabricated member 1 is fabricated, the pre-stressed steel bar 20 needs to be tensioned, and when the pre-stressed steel bar 20 is tensioned, the tension member 120 is connected to the end portion 21 of the prestressed reinforcement 20 by the connection member 110, and the connecting member 110 is wrapped by the grout sealing structure 130, and concrete is poured after a tension machine applies a tension force to the end portion 21 of the prestressed reinforcement 20 through the tension member 120, during the casting process, the grout sealing structure 130 covering the connecting member 110 protects the connecting member 110, prevents the concrete from contacting the connecting member 110, prevents the connecting member 110 from being cast inside the concrete, therefore, when concrete is poured, the end of the concrete goes beyond the end 21 of the prestressed reinforcement 20, the existence of the grout sealing structure 130 enables the end of the concrete body 10 to form a sunken platform 11, the end 21 of the prestressed reinforcement 20 is just positioned in the sunken platform 11, and the whole prestressed reinforcement 20 is positioned inside the end of the concrete body 10. After the prefabricated part 1 manufactured by the tensioning device 100 is filled with the anticorrosive material 30 in the cavity in the sinking platform 11, the steel bars at the end part have a completely sufficient protective layer, so that the anticorrosive performance of the end part of the prefabricated part 1 can be ensured, and the durability of the concrete at the end part of the prefabricated part 1 is greatly improved.
In one embodiment, as shown in fig. 2 to 3, the connecting member 110 is configured as a steel bar sleeve, the steel bar sleeve is provided with a fixing groove 111, one end of an inner wall of the steel bar sleeve is provided with a thread 112, the other end of the inner wall of the steel bar sleeve is provided with an abutting portion 113 protruding out of the inner wall of the steel bar sleeve, and the end 21 of the prestressed steel bar 20 can enter the steel bar sleeve through the fixing groove 111 and abut against the abutting portion 113. The common form of tip 21 of prestressing steel 20 is the pier nose (as shown in the figure and be the pier nose structure), through setting up connecting piece 110 into the steel bar sleeve who opens fixed slot 111, can stretch into the steel bar sleeve through fixed slot 111 with the pier nose structure of the tip 21 of prestressing steel 20, tensioning piece 120 is when passing through connecting piece 110 stretch-draw prestressing steel 20, the pier nose structure of expansion is at inside back of steel bar sleeve and the inseparable butt of butt portion 113, butt portion 113 can prevent prestressing steel 20's pier nose structure from slipping in the steel bar sleeve, guarantee that connecting piece 110 can transmit power for prestressing steel 20 steadily when tensioning.
Specifically, when the end portion 21 of the prestressed reinforcement 20 is configured as a threaded structure, the connecting member 110 may be directly configured as a reinforcement sleeve whose inner wall is threaded, so that the end portion of the prestressed reinforcement 20 is directly in threaded connection with the reinforcement sleeve.
In one embodiment, as shown in fig. 2 to 3, the tensioning device 100 further includes a locking member 140, and the locking member 140 is circumferentially fixed to an outer side surface of the steel bar sleeve to lock the prestressed steel bar 20 and the steel bar sleeve in a state that the end portion 21 of the prestressed steel bar 20 is inserted into the steel bar sleeve. Retaining member 140 can set up to lock nut isotructure, and retaining member 140 can strengthen the telescopic intensity of reinforcing bar, avoids prestressing steel 20 to be drawn and takes off, guarantees the intensity and the stability of tensioning equipment 100 when the stretch-draw.
In one embodiment, as shown in fig. 2-3, the tensioning member 120 is configured as a tensioning screw that is capable of extending into the sleeve and engaging the threads. The tensioning screw is simple in structure and can be directly matched with the steel bar sleeve through threads, one end of the tensioning screw is screwed into the steel bar sleeve through the threads, the steel bar sleeve and the tensioning screw are stably connected, the connection strength is high, and the connection and disassembly process is simple.
In one embodiment, as shown in fig. 2 to 3, the grout sealing structure 130 includes a circumferential grout sealing structure 131 and a side grout sealing structure 132, the circumferential grout sealing structure 131 is wrapped on the outer side of the connecting member 110, the side grout sealing structure 132 is an annular structure, the inner side surface of the side grout sealing structure 132 is abutted against the prestressed reinforcement bars 20, and the outer side surface of the side grout sealing structure 132 is abutted against the circumferential grout sealing structure 131. The annular grout sealing structure 131 wraps the side face of the connecting piece 110, and after concrete is poured, the annular grout sealing structure 131 can form the side wall of the sinking platform 11; the side grout sealing structure 132 is an annular structure, a hole in the middle of the side grout sealing structure is mainly convenient for the prestressed reinforcement 20 to pass through, the side grout sealing structure 132 wraps the end face of one end, close to the prestressed reinforcement 20, of the connecting piece 110, and the side grout sealing structure 132 is arranged to form the bottom wall of the sinking platform 11; the annular grout sealing structure 131 and the side grout sealing structure 132 together wrap the connecting member 110 to prevent concrete from contacting the connecting member 110 during pouring, so that the end surface of the prefabricated part 1 forms the sinking platform 11.
In one embodiment, the circumferential grout seal 131 is provided as a rubber ring; the side sealing structure 132 is provided as a sponge. The rubber ring and the sponge are common materials, so that the purpose can be achieved, and meanwhile, the manufacturing cost is reduced.
In a third aspect, the present invention further provides an end tensioning method for a prefabricated part 1, which uses the end tensioning device 100, the method including:
(1) fixedly connecting the connecting member 110 to the end portion 21 of the prestressed reinforcement 20, and fixedly connecting the tension member 120 to the end portion 21 of the prestressed reinforcement 20 through the connecting member 110;
(2) the connecting member 110 is wrapped by the grout structure 130.
After the steps are completed, tensioning operation can be performed on the prestressed reinforcement 20 through a tensioning machine, concrete pouring is started after tensioning is completed, concrete curing is performed after the concrete pouring is completed, the concrete is cured to the demolding strength and then tensioned, the tensioning member 120 is detached, the grout sealing structure 130 around the connecting member 110 is detached, and the connecting member 110 is separated from the prestressed reinforcement 20 and taken out. The end 21 of the pre-stressed steel bar 20 which is taken out is sunk in the end sinking platform 11 of the prefabricated part 1 to form a cavity, the cavity is filled with expanded cement mortar, after the mortar is cured to reach the strength, the end steel bar of the prefabricated part 1 is completely provided with an enough protective layer, the end corrosion resistance of the prefabricated part 1 is ensured, the durability of the concrete at the end of the part is greatly improved, and the corrosion resistance of the end part concrete is greatly improved compared with that of other parts even in deep underground corrosive environment.
In a specific embodiment, step (1) is followed by: the locking member 140 is circumferentially fixed to the outer side of the connecting member 110 to lock the prestressed reinforcement 20 with the connecting member 110.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (4)
1. The end stretching device of the prefabricated part is characterized by comprising a connecting piece, a stretching piece and a slurry sealing structure, wherein the connecting piece is connected with the stretching piece and the end of a prestressed reinforcement, and the slurry sealing structure is wrapped on the outer side of the connecting piece; the connecting piece is arranged to be a steel bar sleeve, a fixing groove is formed in the steel bar sleeve along the radial direction of the steel bar sleeve, one end of the inner wall of the steel bar sleeve is provided with a thread, the other end of the inner wall of the steel bar sleeve is provided with an abutting part protruding out of the inner wall of the steel bar sleeve, and the end part of a prestressed steel bar can enter the steel bar sleeve through the fixing groove and abut against the abutting part; the grout sealing structure comprises a circumferential grout sealing structure and a side grout sealing structure, the circumferential grout sealing structure is wrapped on the outer side of the connecting piece, the side grout sealing structure is of an annular structure, the inner side face of the side grout sealing structure is abutted to the prestressed reinforcement, and the outer side face of the side grout sealing structure is abutted to the circumferential grout sealing structure.
2. An end tensioning device for prefabricated parts according to claim 1, further comprising a locking member which is circumferentially fixed to an outer side surface of the steel bar sleeve in a state where the end of the prestressed steel bar is inserted into the steel bar sleeve to lock the prestressed steel bar with the steel bar sleeve.
3. An end tensioning device for prefabricated units according to claim 1, wherein the tensioning elements are provided as tensioning screws which can be inserted into the reinforcing sleeve and engage with the thread.
4. An end tensioning device for prefabricated parts according to claim 1, wherein the circumferential grout structure is provided as a rubber ring; the side surface pulp sealing structure is sponge.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736881.9A CN111975981B (en) | 2020-07-28 | 2020-07-28 | End stretching device for prefabricated part |
| PCT/CN2020/111860 WO2022021523A1 (en) | 2020-07-28 | 2020-08-27 | Prefabricated component, end tensioning device of prefabricated component, and tensioning method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010736881.9A CN111975981B (en) | 2020-07-28 | 2020-07-28 | End stretching device for prefabricated part |
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| Publication Number | Publication Date |
|---|---|
| CN111975981A CN111975981A (en) | 2020-11-24 |
| CN111975981B true CN111975981B (en) | 2021-05-07 |
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| CN113290692A (en) * | 2021-07-02 | 2021-08-24 | 中交一公局第二工程有限公司 | Simple tensioning method for prefabricated part steel bar |
| CN114800853B (en) * | 2022-05-10 | 2024-05-24 | 江门福鑫闽珠市政设施有限公司 | Concrete prefabricated member treatment method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100398760C (en) * | 2004-07-27 | 2008-07-02 | 柳州欧维姆机械股份有限公司 | No bonded finish rolled deformed reinforcing bar with spiral ribs, anchoring system and construction method |
| JP4545608B2 (en) * | 2005-02-10 | 2010-09-15 | サンコーテクノ株式会社 | Expansion anchor, extension anchor construction method |
| CN101614013B (en) * | 2009-07-16 | 2011-01-05 | 盐城市同力新型建材有限公司 | Pretensioning prestressed concrete pile, stretch-draw anchoring piece thereof and method for manufacturing stretch-draw anchoring piece |
| CN101736760B (en) * | 2009-12-25 | 2012-06-06 | 上海智平基础工程有限公司 | Construction method of prestressed anti-floating anchor rod |
| CN203357662U (en) * | 2013-07-26 | 2013-12-25 | 谢辉宗 | Special protective device for anchor pocket at end part of first expanding concrete slab pre-stressed steel |
| CN103556624B (en) * | 2013-11-01 | 2016-02-24 | 建华建材（中国）投资有限公司 | Adapter sleeve, to produce and method of attachment containing the prefabricated units of this adapter sleeve and prefabricated units |
| JP2017013379A (en) * | 2015-07-01 | 2017-01-19 | 巴機械工業株式会社 | PC steel connection device |
| CN206512712U (en) * | 2017-03-03 | 2017-09-22 | 中淳高科桩业股份有限公司 | The pile crown structure of pretensioning prestressed concrete prefabricated pile |
| CN108284509B (en) * | 2018-01-17 | 2019-11-08 | 湖北工业大学 | A kind of connection locking device |
| CN210216171U (en) * | 2019-07-01 | 2020-03-31 | 成都市路桥工程股份有限公司 | Bridge prestressing force pretension tensioning equipment |
-
2020
- 2020-07-28 CN CN202010736881.9A patent/CN111975981B/en active Active
- 2020-08-27 WO PCT/CN2020/111860 patent/WO2022021523A1/en active Application Filing
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| Publication number | Publication date |
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| CN111975981A (en) | 2020-11-24 |
| WO2022021523A1 (en) | 2022-02-03 |
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