CN114775899A - bolt-anchor-U-shaped steel plate connected precast concrete beam inter-span splicing structure and method - Google Patents
bolt-anchor-U-shaped steel plate connected precast concrete beam inter-span splicing structure and method Download PDFInfo
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- CN114775899A CN114775899A CN202210460173.6A CN202210460173A CN114775899A CN 114775899 A CN114775899 A CN 114775899A CN 202210460173 A CN202210460173 A CN 202210460173A CN 114775899 A CN114775899 A CN 114775899A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
- E04C3/205—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members with apertured web, e.g. frameworks, trusses
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
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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
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/20—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of concrete, e.g. reinforced concrete, or other stonelike material
- E04B1/21—Connections specially adapted therefor
- E04B1/215—Connections specially adapted therefor comprising metallic plates or parts
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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
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5825—Connections for building structures in general of bar-shaped building elements with a closed cross-section
- E04B1/5831—Connections for building structures in general of bar-shaped building elements with a closed cross-section of substantially rectangular form
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
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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
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B2001/5875—Connections for building structures in general of bar-shaped building elements using exterior clamping plates or shells
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- Engineering & Computer Science (AREA)
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- Structural Engineering (AREA)
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- Electromagnetism (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention provides a bolt-anchor-U-shaped steel plate connected precast concrete beam span-inside splicing structure and a method, and belongs to the field of building beam splicing structures. The problems that the construction difficulty of the splicing joints of the prefabricated concrete members is high, the construction cost is high, earthquake damage to the joints is serious, and construction cannot be performed in winter due to severe weather are solved. The novel prefabricated concrete beam comprises two prefabricated concrete beams, a U-shaped steel plate, a plurality of tension area anchor bolts used for splicing and a plurality of web penetrating bolts used for splicing, wherein the U-shaped steel plate is formed by splicing two web steel plates and one tension steel plate. The invention adopts U-shaped steel plates and high-strength bolts to perform prefabrication and assembly on short concrete beams at two sides in a span, covers a web plate and a plane of a tension area of the concrete beam by the U-shaped steel plates, ensures that longitudinal tension steel bars are discontinuous in the span, utilizes the steel plates as tension bars, and bonds the steel plates and the concrete by adopting double-component epoxy resin glue so as to form a whole.
Description
Technical Field
The invention belongs to the field of building beam splicing structures, and particularly relates to a bolt-anchor-U-shaped steel plate connected precast concrete beam cross-inside splicing structure and a method.
Background
In view of the current research situation and construction process of the existing precast concrete structural members, the research on the splicing process of domestic and foreign precast members basically focuses on beam-column nodes or beam-wall nodes, and neglects the connection and splicing of a single member, so that the damage caused by earthquake at the spliced nodes under the action of earthquake is serious. Secondly, the construction space at the splicing node is limited at the present stage, so that the difficulty and the cost of field operation can be increased. In addition, the wet operation demand required at the splicing node of the traditional precast concrete member is large, so that the technologies cannot be normally carried out under the condition of severe cold weather in winter in the northeast of China, and the problems of prolonged construction period and the like are caused. Therefore, it is necessary to design a new precast concrete girder span-inner splicing structure to solve the above problems.
Disclosure of Invention
In view of the above, the invention aims to provide a bolt-anchor-U-shaped steel plate connected precast concrete beam inter-span splicing structure and a construction method, in order to relieve the phenomena that the construction difficulty of the splicing node of the traditional precast concrete member is high, the construction cost is high, and the earthquake damage of the node is serious, and solve the problem that construction cannot be performed in winter due to severe weather.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a precast concrete beam span inner splicing structure connected by a bolt, an anchor and a U-shaped steel plate comprises two precast concrete beams, a U-shaped steel plate, a plurality of anchor bolts for a tension area for splicing and a plurality of web penetrating bolts for splicing, wherein the U-shaped steel plate is formed by splicing two web steel plates and one tension steel plate, the two web steel plates are symmetrically fixed at two ends of the tension steel plate, the two beam ends close to each other of the two precast concrete beams are arranged just opposite to each other, a gap is reserved at the two beam ends close to each other, the U-shaped steel plate wraps the bottom surfaces, the front surfaces and the rear surfaces of the two beam ends close to each other of the two precast concrete beams, the tension steel plates are adhered to the bottom surfaces of the two beam ends close to each other, the two web steel plates are respectively adhered to the front surfaces and the rear surfaces of the two beam ends close to each other, and a plurality of concrete open holes penetrating through the front end surface and the rear end surface are respectively formed at the two beam ends close to each other, correspondingly, a plurality of web steel plate openings are formed in the corresponding positions of the two web steel plates, and the two web steel plates and the two precast concrete beams are connected by penetrating web penetrating bolts through the concrete openings and the corresponding web steel plate openings;
the bottom surfaces of the two beam ends close to each other are provided with a plurality of reserved blind holes, correspondingly, a plurality of tensioned steel plate openings are correspondingly formed in the tensioned steel plates, an internal threaded stud is arranged in each reserved blind hole, and a tensioned area anchor bolt penetrates through the tensioned steel plate openings to be connected with the internal threaded studs at the corresponding positions to realize the connection of the tensioned steel plates and the two precast concrete beams;
and grouting materials are poured into the gaps of the two spliced precast concrete beams to enable the two precast concrete beams to form an integral structure.
Furthermore, the U-shaped steel plate is formed by welding two web plate steel plates and one tension plate.
Furthermore, a hollow steel pipe is arranged in each concrete opening penetrating through the front end face and the rear end face, and two ends of each hollow steel pipe penetrate through web steel plate openings on the web steel plates on the corresponding sides respectively.
Furthermore, the surfaces of the web plate steel plate and the tension steel plate and the precast concrete beam are bonded by adopting a bi-component epoxy resin adhesive.
Furthermore, a plurality of longitudinal steel bars are arranged in the precast concrete beam and bound through a plurality of stirrups.
Furthermore, the gap is a splicing seam, and the width of the splicing seam is 10 mm.
Furthermore, the grouting material is high-strength non-shrinkage grouting material.
Furthermore, a stacked spacer is respectively arranged at the contact part of each web penetrating bolt and the two web steel plates and the contact part of each tension area anchor bolt and the tension steel plate.
Another aspect of the present application is to provide a construction method for a precast concrete beam span inner splicing structure connected by a bolt-anchor-U-shaped steel plate, which specifically includes the following steps:
prefabricating the precast concrete beam sections spliced on two sides according to design requirements: reserving holes needed by an inner-span splicing area during template manufacturing, embedding hollow steel pipes and internal thread studs at corresponding holes, wherein the length of each hollow steel pipe is more than the beam width of the precast concrete beam, and then pouring concrete to form the precast concrete beam;
secondly, manufacturing a steel plate: cutting the steel plate according to the actual size of the test piece, cutting and opening holes at the corresponding hole positions, wherein the opening holes in the steel plate are larger than the size of the hole, so that the problem that the steel plate cannot be installed due to manufacturing errors is avoided;
thirdly, splicing steel plates: demolding the precast concrete beam maintained for a period of time, then performing prefabrication and assembly on a construction site, and bonding three steel plates with the surface of the precast concrete beam by adopting a bi-component epoxy resin adhesive; at the moment, the hollow steel pipe penetrates through web steel plate openings on web steel plates on two sides, after the pasting is finished, the steel plates are welded, and redundant steel pipes are cut off;
fourthly, after welding two web plate steel plates and one tension steel plate along the joint, penetrating a web plate core penetrating bolt through the pre-embedded hollow steel pipe and installing a tension area anchor bolt into the internal thread bolt to splice the two precast concrete beams, and applying pre-tightening force on the web plate core penetrating bolt and the tension area anchor bolt by adopting a stacked gasket;
fifthly, adopting grouting materials to perform field grouting on the spliced seams: placing concrete beam compression district up, slowly pouring the grout into concatenation seam, waiting to demold after the grout condenses, whole concrete precast beam concatenation is accomplished promptly.
Compared with the prior art, the bolt-anchor-U-shaped steel plate connected precast concrete beam span inner splicing structure and the construction method have the beneficial effects that:
(1) the precast concrete beam span inner splicing structure connected by the bolt, the anchor and the U-shaped steel plate greatly reduces the construction time and the construction cost and effectively improves the construction speed by splicing in the precast concrete beam span. Compared with the traditional reinforced concrete structure, the invention has the advantages that the ultimate bearing capacity and the like are obviously improved, the problem that construction cannot be carried out due to cold weather can be effectively solved through the cross-inside prefabricated assembly, and compared with the traditional reinforced concrete structure, the invention has the obvious phenomena of steel plate cracking and deformation before ultimate damage occurs, so that the invention is more suitable for damage received under earthquake motion.
(2) It is a neotype precast concrete roof beam connection form in this application to avoid in the past the concatenation of precast concrete component at the node because the limited influence in site operation space, thereby lead to the emergence of the wet operation degree of difficulty increase of concatenation department, increase construction cost, slow down construction progress scheduling problem.
(3) Under the condition that the manufacturing cost is not much different from that of the traditional structure, the invention obviously increases the construction space, updates the construction process, reduces a plurality of problems generated by construction while ensuring the structural superiority, and has obvious economic benefits and social benefits of saving building materials, ensuring the safety of personnel and equipment and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a front view of a precast concrete beam inter-span splicing structure of a bolt-anchor-U-shaped steel plate connection according to an embodiment of the present invention;
fig. 2 is a bottom view of a precast concrete beam inter-span splicing structure in which the bolt-anchor-U-shaped steel plates are connected according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of two precast concrete beams in direct alignment according to an embodiment of the present invention;
FIG. 4 is a schematic view of an angular structure of a U-shaped steel plate according to an embodiment of the present invention;
FIG. 5 is a schematic view of another angle structure of a U-shaped steel plate according to an embodiment of the present invention;
FIG. 6 is a schematic view of a web feed-through bolt and a stacked washer according to an embodiment of the present invention;
fig. 7 is a sectional view of a precast concrete beam segment of a bolt-anchor-U-shaped steel plate joint according to an embodiment of the present invention;
FIG. 8 is a cross-sectional view of an inter-span splicing section of a precast concrete beam in which a bolt-anchor-U-shaped steel plate is connected according to an embodiment of the present invention;
FIG. 9 is a schematic illustration of the connection of the tension zone anchor according to an embodiment of the present invention;
FIG. 10 is a schematic view of a through-web bolted connection according to an embodiment of the present invention;
fig. 11 is a schematic diagram of grouting reserved joints in a compression zone according to an embodiment of the present invention.
Description of reference numerals:
1. a web feed-through bolt; 2. a U-shaped steel plate; 3. a tension zone anchor bolt; 4. prefabricating a concrete beam; 5. drilling holes in the concrete; 6. reserving a blind hole; 7. opening holes in the web plate steel plate; 8. opening holes in the tensioned steel plates; 9. splicing seams, 10 and stacked gaskets; 11. longitudinal reinforcing steel bars; 12. hooping; 13. a hollow steel pipe; 14. an internal thread stud; 15. grouting material; 16. a web steel plate; 17. a tension steel plate.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in a specific case to those of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1-11, the precast concrete beam span inner splicing structure connected by bolt-anchor-U-shaped steel plates comprises two precast concrete beams 4, a U-shaped steel plate 2, a plurality of tension zone anchor bolts 3 for splicing and a plurality of web penetrating bolts 1 for splicing, wherein the U-shaped steel plate 2 is formed by splicing two web steel plates 16 and one tension steel plate 17, the two web steel plates 16 are symmetrically fixed at two ends of the tension steel plate 17, the two adjacent beam ends of the two precast concrete beams 4 are arranged oppositely, a gap is left between the two adjacent beam ends, the U-shaped steel plate 2 wraps the bottom, the front and the back of the two adjacent beam ends of the two precast concrete beams 4, the tension steel plate 17 is adhered to the bottom of the two adjacent beam ends, the two web steel plates 16 are adhered to the front and the back of the two adjacent beam ends respectively, a plurality of concrete open holes 5 penetrating through the front and back end faces are formed on the two adjacent beam ends, correspondingly, a plurality of web steel plate openings 7 are formed in the corresponding positions of the two web steel plates, and the two web steel plates 16 are connected with the two precast concrete beams 4 by the web penetrating bolts 1 penetrating through the concrete openings 5 and the corresponding web steel plate openings 7;
a plurality of reserved blind holes 6 are formed in the bottom surfaces of the two beam ends close to each other, correspondingly, a plurality of tensioned steel plate openings 8 are correspondingly formed in the tensioned steel plates 17, an internal threaded stud 14 is arranged in each reserved blind hole 6, and the tensioned steel plates 17 are connected with the two precast concrete beams 4 by connecting the tensioned region anchor bolts 3 through the tensioned steel plate openings 8 and the internal threaded studs 14 at the corresponding positions;
and pouring grouting materials 15 into the gaps of the two spliced precast concrete beams 4 to enable the two precast concrete beams 4 to form an integral structure.
The U-shaped steel plate 2 is formed by welding two web plate steel plates 16 and one tension plate 17, and the selected length of the steel plates is the lap joint length of the steel bars. According to the application, longitudinal tension steel bars in the precast concrete beams on two sides are discontinuous in the span, the U-shaped steel plates in the span act as longitudinal tension steel bars in the splicing section, and the penetrating high-strength bolts and the steel plates transmit shearing force together.
A hollow steel pipe 13 is arranged in each concrete opening 5 penetrating through the front end face and the rear end face, and two ends of each hollow steel pipe 13 penetrate through web steel plate openings 7 in web steel plates 16 on corresponding sides respectively. The hollow steel tube is used for positioning.
The web plate steel plate 16 and the tension steel plate 6 are bonded with the surface of the precast concrete beam by adopting bi-component epoxy resin glue, so that the strength requirement is ensured.
A plurality of longitudinal steel bars 11 are arranged in the precast concrete beam 4, and the longitudinal steel bars 11 are bound through a plurality of stirrups 12.
The seam is a splicing seam 9, and the width of the splicing seam 9 is 10 mm. The grouting material 15 is H60 high-strength non-shrinkage grouting material.
A stacked gasket 10 is respectively arranged at the contact part of each web penetrating bolt 1 and two web steel plates and the contact part of each tension area anchor bolt 3 and a tension steel plate 17; a large-size stacked gasket is adopted, and a wrench is used for screwing to apply pretightening force to the gasket, so that local unevenness of the steel plate caused by the fact that the size of the gasket is too small is avoided.
The construction method of the precast concrete beam span inner splicing structure connected by the bolt, the anchor and the U-shaped steel plate specifically comprises the following steps:
prefabricating 4 sections of the precast concrete beams spliced at two sides according to design requirements: reserving holes needed by an inner-span splicing area during template manufacturing, embedding a hollow steel pipe 13 and an internal thread stud 14 at the corresponding holes, wherein the length of the hollow steel pipe 13 is more than the beam width of the precast concrete beam 4, and then pouring concrete to form the precast concrete beam 4;
secondly, manufacturing a steel plate: cutting a steel plate according to the size of an actual test piece, cutting and forming holes at corresponding hole positions, wherein the holes in the steel plate are slightly larger than the hole size (generally 1-2mm larger), so that the problem that the steel plate cannot be installed due to manufacturing errors is avoided;
thirdly, splicing steel plates: demolding the precast concrete beam 4 which is maintained for a period of time, then performing prefabrication and assembly on a construction site, and bonding three steel plates with the surface of the precast concrete beam by adopting a bi-component epoxy resin adhesive; at the moment, the hollow steel pipe 13 penetrates through the web steel plate openings 7 on the web steel plates 16 on the two sides, after the pasting is finished, the steel plates are welded, and redundant steel pipes are cut off;
fourthly, after the two web steel plates 16 and the one tension steel plate 17 are welded along the joint, the web piercing bolt 1 penetrates through the pre-embedded hollow steel pipe 13 and the tension area anchor bolt 3 is installed in the internal thread stud 14 to splice the two precast concrete beams 4, and a stacked gasket 10 is adopted to apply pre-tightening force on the web piercing bolt and the tension area anchor bolt 3;
fifthly, adopting grouting material 15 to perform field grouting on the spliced seam 9: placing the concrete beam with the compression area upward, slowly pouring grouting material 15 into the splicing seam 9 to ensure that the grouting is sufficient, and demolding after the grouting material is condensed (demolding after 1 day), namely completing the splicing of the integral concrete precast beam.
The embodiments of the invention disclosed above are intended to be merely illustrative. The examples are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention.
Claims (9)
1. The utility model provides a precast concrete roof beam of bolt-anchor-U-shaped steel sheet connection strides interior mosaic structure which characterized in that: the concrete beam comprises two precast concrete beams (4), a U-shaped steel plate (2), a plurality of tension area anchor bolts (3) for splicing and a plurality of web penetrating bolts (1) for splicing, wherein the U-shaped steel plate (2) is formed by splicing two web steel plates (16) and one tension steel plate (17), the two web steel plates (16) are symmetrically fixed at two ends of the tension steel plate (17), the two beam ends, close to each other, of the two precast concrete beams (4) are arranged oppositely, a gap is reserved between the two beam ends, the U-shaped steel plate (2) wraps the bottom surfaces, the front surfaces and the rear surfaces of the two beam ends, close to each precast concrete beam (4), the tension steel plates (17) are adhered to the bottom surfaces of the two beam ends, the two web steel plates (16) are adhered to the front surfaces and the rear surfaces of the two beam ends, respectively, and a plurality of concrete open holes (5) penetrating through the front and rear end surfaces are formed in the two beam ends close to each other, correspondingly, a plurality of web steel plate openings (7) are formed in the corresponding positions of the two web steel plates, and the two web steel plates (16) are connected with the two precast concrete beams (4) by passing the web core-penetrating bolts (1) through the concrete open holes (5) and the corresponding web steel plate openings (7);
the bottom surfaces of the two beam ends close to each other are provided with a plurality of reserved blind holes (6), correspondingly, a plurality of tensioned steel plate openings (8) are correspondingly formed in the tensioned steel plates (17), an internal thread stud (14) is arranged in each reserved blind hole (6), and the tensioned steel plates (17) are connected with the two precast concrete beams (4) through the tensioned steel plate openings (8) by passing anchor bolts (3) through tensioned regions to be connected with the internal thread studs (14) at corresponding positions;
grouting materials (15) are poured into the gaps of the two spliced precast concrete beams (4) to enable the two precast concrete beams (4) to form an integral structure.
2. The precast concrete beam span-inner splicing structure of a bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: the U-shaped steel plate (2) is formed by welding two web plate steel plates (16) and one tension steel plate (17).
3. The precast concrete beam inter-span splicing structure of bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: a hollow steel pipe (13) is arranged in each concrete opening (5) penetrating through the front end face and the rear end face, and two ends of each hollow steel pipe (13) penetrate through web steel plate openings (7) in web steel plates (16) on the corresponding sides respectively.
4. The precast concrete beam inter-span splicing structure of bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: the web plate steel plate (16) and the tension steel plate (6) are bonded with the surface of the precast concrete beam by adopting bi-component epoxy resin glue.
5. The precast concrete beam span-inner splicing structure of a bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: a plurality of longitudinal steel bars (11) are arranged in the precast concrete beam (4), and the longitudinal steel bars (11) are bound through a plurality of stirrups (12).
6. The precast concrete beam span-inner splicing structure of a bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: the seam is a splicing seam (9), and the width of the splicing seam (9) is 10 mm.
7. The precast concrete beam span-inner splicing structure of a bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: the grouting material (15) is high-strength non-shrinkage grouting material.
8. The precast concrete beam span-inner splicing structure of a bolt-anchor-U-shaped steel plate connection according to claim 1, wherein: and a stacked gasket (10) is respectively arranged at the contact part of each web penetrating bolt (1) and the two web steel plates and the contact part of each tension area anchor bolt (3) and the tension steel plate (17).
9. The construction method of the precast concrete beam inter-span splicing structure of the bolt-anchor-U-shaped steel plate connection according to any one of claims 1 to 8, wherein: the method specifically comprises the following steps:
prefabricating the precast concrete beam (4) sections spliced on two sides according to design requirements: reserving holes needed by an inner-span splicing area during template manufacturing, pre-burying a hollow steel pipe (13) and an internal thread stud (14) at the corresponding holes, wherein the length of the hollow steel pipe (13) is more than the beam width of the precast concrete beam (4), and then pouring concrete to form the precast concrete beam (4);
secondly, manufacturing a steel plate: cutting a steel plate according to the actual size of the test piece, cutting and forming holes at corresponding hole positions, wherein the holes in the steel plate are larger than the hole size, so that the problem that the steel plate cannot be installed due to manufacturing errors is avoided;
thirdly, splicing the steel plates: demolding the precast concrete beam (4) which is maintained for a period of time, then performing prefabrication and assembly on a construction site, and bonding three steel plates with the surface of the precast concrete beam by adopting a bi-component epoxy resin adhesive; at the moment, the hollow steel pipe (13) penetrates through web steel plate openings (7) on web steel plates (16) on two sides, the steel plates are welded after the pasting is finished, and redundant steel pipes are cut off;
fourthly, after welding two web plate steel plates (16) and one tension plate steel plate (17) along the joint, penetrating a web plate core penetrating bolt (1) through a pre-embedded hollow steel pipe (13) and installing a tension area anchor bolt (3) into an internal thread anchor bolt (14) to splice the two precast concrete beams (4), and applying pretightening force on the web plate core penetrating bolt and the tension area anchor bolt (3) by adopting a laminated gasket (10);
fifthly, adopting grouting material (15) to perform field grouting on the spliced seam (9): placing the concrete beam with the compression area upward, slowly pouring grouting material (15) into the splicing seam (9), and demolding after the grouting material is condensed, namely completing the splicing of the integral concrete precast beam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210460173.6A CN114775899A (en) | 2022-04-28 | 2022-04-28 | bolt-anchor-U-shaped steel plate connected precast concrete beam inter-span splicing structure and method |
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| CN202210460173.6A CN114775899A (en) | 2022-04-28 | 2022-04-28 | bolt-anchor-U-shaped steel plate connected precast concrete beam inter-span splicing structure and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116180983A (en) * | 2023-02-09 | 2023-05-30 | 中建八局西北建设有限公司 | Large-scale laminated wood structure and construction method of super-large-section laminated wood beam |
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