CN114718245B - Recycled block/aggregate concrete prefabricated composite beam and construction method thereof - Google Patents
Recycled block/aggregate concrete prefabricated composite beam and construction method thereof Download PDFInfo
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- CN114718245B CN114718245B CN202210429705.XA CN202210429705A CN114718245B CN 114718245 B CN114718245 B CN 114718245B CN 202210429705 A CN202210429705 A CN 202210429705A CN 114718245 B CN114718245 B CN 114718245B
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- 239000004567 concrete Substances 0.000 title claims abstract description 120
- 238000010276 construction Methods 0.000 title claims abstract description 48
- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 238000005452 bending Methods 0.000 claims description 30
- 238000000034 method Methods 0.000 claims description 13
- 239000002689 soil Substances 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 7
- 239000002699 waste material Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 239000004576 sand Substances 0.000 claims description 4
- 239000011241 protective layer Substances 0.000 claims description 3
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 238000003475 lamination Methods 0.000 abstract description 8
- 239000011150 reinforced concrete Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 238000007788 roughening Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 101100334009 Caenorhabditis elegans rib-2 gene Proteins 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- 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
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- 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
-
- 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
-
- 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
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
- E04C5/0609—Closed cages composed of two or more coacting cage parts, e.g. transversally hinged or nested parts
-
- 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
- E04C5/06—Reinforcing elements of metal, e.g. with non-structural coatings of high bending resistance, i.e. of essentially three-dimensional extent, e.g. lattice girders
- E04C5/0604—Prismatic or cylindrical reinforcement cages composed of longitudinal bars and open or closed stirrup rods
- E04C5/0622—Open cages, e.g. connecting stirrup baskets
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention discloses a recycled block/aggregate concrete precast composite beam, which comprises a precast part and a composite part, wherein the precast part comprises a hollow block and a hollow block; the prefabricated part comprises an oblique web rib, a beam bottom horizontal tie rib, a beam bottom longitudinal rib, prefabricated part new concrete and a regenerated block, and the superposed part comprises a Liang Dingshui flat tie rib, a beam top longitudinal rib and superposed part new concrete. The diagonal web bars, the horizontal tie bars at the bottom of the beam and the longitudinal bars at the bottom of the beam are arranged during construction of the prefabricated part, and then the regenerated blocks and the new concrete of the prefabricated part are mixed and poured; liang Dingshui flat tie bars and beam top longitudinal bars are arranged during construction of the overlapped part, and then new concrete of the overlapped part is poured. The invention also discloses a construction method of the recycled block/aggregate concrete precast composite beam. The invention solves the problem of difficult construction when the reinforced concrete precast laminated beam recycles large-size regenerated blocks, and remarkably improves the construction efficiency of the precast laminated beam components; the regenerated blocks partially protruding from the lamination surface can improve the bonding ability of the lamination surface.
Description
Technical Field
The invention relates to the technical field of recycling of engineering waste, in particular to a recycled block/aggregate concrete precast composite beam and a construction method thereof.
Background
Engineering waste contains a large amount of engineering produced soil and waste concrete. The method comprises the steps of crushing waste concrete into small-size recycled coarse aggregate and large-size recycled blocks, and then doping engineering produced soil, the recycled coarse aggregate and the recycled blocks (which are respectively used for replacing natural sand, natural coarse aggregate and partial concrete) into the concrete to form recycled block/aggregate concrete which is used in a new structure, so that the method is an effective way for solving the problems.
Reinforced concrete structures are widely used in engineering construction with good stress properties and economy. Compared with the conventional concrete member, the casting of the recycled block/aggregate concrete cast-in-situ member requires additional recycled block casting procedures, so that the workload of a construction site is increased, and the construction speed is reduced. The prefabricated part of the regenerated block/aggregate concrete member is transferred to a prefabrication factory, so that the problem of on-site throwing of the block can be effectively avoided, the on-site workload is reduced, and the on-site construction speed is improved. However, in the prior art (JGJ 1-2014, technical regulations for fabricated concrete structures), there are great difficulties in recycling large-size recycled blocks in reinforced concrete precast composite beams. This is because, when the prefabricated part is produced in a factory, the oblique hooks on the top ends of the horizontal limbs of the conventional integral closed stirrups or the side limbs of the open stirrups in the combined closed stirrups of the prefabricated laminated beam can have adverse effects of blocking, rebounding and the like on the top-down throwing of the block. Particularly, the regenerated block with larger size can even be blocked between the stirrups and cannot fall completely, so that the construction difficulty of the prefabricated laminated beam is greatly increased, and the production efficiency of the component is low and even construction cannot be performed. In addition, the prefabricated laminated beams generally need to carry out roughening, chemical treatment or the like on the laminated surfaces so as to increase the roughness of the laminated surfaces and improve the bonding performance of the laminated surfaces.
In summary, the prior art has the problems that the construction is difficult when the prefabricated laminated beam is recycled to use the large-size regenerated block, and the laminated surface of the prefabricated laminated beam needs to be treated to increase the roughness.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art and provides a recycled block/aggregate concrete precast composite beam and a construction method thereof. The invention adopts the oblique web bars, the horizontal tie bars at the beam bottom and the Liang Dingshui horizontal tie bars to replace the conventional stirrups, and combines the Liang Dingshui horizontal tie bars and the post construction method of the longitudinal bars at the beam top (namely, the method is arranged during construction of the overlapping part), thereby effectively solving the problem that large-size regenerated blocks in the conventional prefabricated overlapping beam are difficult to put in, and obviously improving the construction efficiency; part of the regenerated blocks protrude out of the lamination surface, so that the roughness of the lamination surface is increased, and the procedures of chemical treatment, roughening and the like of the lamination surface of the traditional precast lamination beam can be omitted.
In order to achieve the aim of the invention, the invention provides a recycled block/aggregate concrete precast composite beam, which comprises a precast part and a composite part; the prefabricated part comprises an inclined web rib, a beam bottom horizontal tie rib, a beam bottom longitudinal rib, prefabricated part new concrete and a regenerated block, and the overlapped part comprises a Liang Dingshui flat tie rib, a beam top longitudinal rib and overlapped part new concrete;
the two pairs of the oblique web ribs are respectively and crosswise arranged on the two side surfaces of the recycled block/aggregate concrete precast composite beam; each oblique web rib is formed by bending a steel bar for a plurality of times, and each oblique web rib comprises a plurality of bending parts and two end vertical sections respectively positioned at the starting end and the tail end; the beam bottom horizontal tie bars and the Liang Dingshui horizontal tie bars are respectively provided with two end hooks; each bending part is overlapped with a horizontal tie bar or a Liang Dingshui horizontal tie bar at the bottom of the beam; two adjacent end vertical sections of a pair of oblique web bars positioned on the same side are welded and connected;
the beam top longitudinal ribs and the beam bottom longitudinal ribs are positioned in a stirrup cage formed by Liang Dingshui flat tie ribs, beam bottom horizontal tie ribs and oblique web ribs and are abutted against the stirrup cage;
the diagonal web ribs, the horizontal tie ribs at the bottom of the beam and the longitudinal ribs at the bottom of the beam are arranged during construction of the prefabricated part, then the regenerated blocks and the prefabricated part new concrete are mixed and poured, and gaps between the regenerated blocks are filled with the prefabricated part new concrete; liang Dingshui flat tie bars and beam top longitudinal bars are arranged during construction of the overlapping part, and then new concrete of the overlapping part is poured;
the recycled block/aggregate concrete precast superposed beam is provided with a stirrup non-encryption area and a stirrup encryption area.
Further, the bending angle of the end hook is 135 °.
Further, the bending angle of each bending part in the stirrup non-encryption area is smaller than that of each bending part in the stirrup encryption area. The stirrup non-encryption area and the stirrup encryption area are arranged through the difference of bending angles.
Further, the prefabricated part new concrete and the overlapped part new concrete are recycled aggregate concrete doped with recycled coarse aggregate and engineering produced soil; the recycled coarse aggregate partially or completely replaces natural coarse aggregate, and the engineering produced soil partially or completely replaces natural sand; the strength grade of the prefabricated part of the new concrete is not lower than C30, and the strength grade of the overlapped part of the new concrete is not lower than C25.
Further, the regeneration block body part protrudes out of the upper surface of the precast part new concrete, and the ratio of the horizontal projection area of the protruding part to the upper surface area of the precast part new concrete is not less than 1:3. When the ratio of the horizontal projection area of the protruding part to the upper surface area of the new concrete of the prefabricated part is not less than 1:3, the bonding performance of the prefabricated part in the prefabricated laminated beam and the lamination surface between the prefabricated part and the lamination part can reach a satisfactory level, and the integrity of the prefabricated laminated beam is good.
Further, the regenerated block is a block formed by crushing waste concrete after a old building, a road, a bridge or a dyke is dismantled and all or part of reinforcing steel bars and a protective layer are removed.
Further, the characteristic size of the regenerated block is not smaller than 60mm, the ratio of the mass of the regenerated block to the total mass of the prefabricated part new concrete and the overlapped part new concrete is 1:4-1:1, and in the range of the ratio, the whole performance of the satisfactory component and the recycling efficiency of engineering waste can be realized.
Further, the length of the straight section of the end hook is not smaller than the larger value of 10d and 75mm, wherein d is the diameter of the beam bottom horizontal tie bar or the beam top horizontal tie bar. When the length of the straight section of the end hook is in the range, the better anchoring effect of the end hook of the horizontal tie bar and the Liang Dingshui horizontal tie bar at the bottom of the beam can be realized.
Further, the length of the stirrup encryption area is not smaller than the larger value of 2h and 500mm, wherein h is the beam height of the recycled block/aggregate concrete precast composite beam.
The construction method of the recycled block/aggregate concrete precast composite beam comprises the following steps:
(1) Installing oblique web ribs, horizontal tie ribs at the bottom of the beam and longitudinal ribs at the bottom of the beam to form a reinforcement cage;
(2) Installing a pouring die outside the reinforcement cage;
(3) Putting the regenerated block fully wetted in advance into the pouring die at one time;
(4) Pouring enough new concrete of the prefabricated part into the pouring mould, and fully vibrating the new concrete to finish the construction of the prefabricated part;
(5) Hoisting the prefabricated part of the recycled block/aggregate concrete prefabricated superposed beam to a specific placement part of a construction site, and then installing Liang Dingshui flat tie bars and beam top longitudinal bars;
(6) And pouring new concrete of the overlapped part, and finishing the construction of the overlapped part.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) The oblique web bars, the horizontal tie bars at the beam bottom and the Liang Dingshui horizontal tie bars are adopted to replace the conventional integral closed stirrups or combined closed stirrups, and the method of the rear construction of the Liang Dingshui horizontal tie bars and the longitudinal bars at the beam top is combined (namely, the method is arranged during construction of the overlapped part), so that the throwing of large-size regenerated blocks during the production of the prefabricated part of the prefabricated overlapped beam is greatly facilitated, the problem that the construction of the large-size regenerated blocks is difficult during the cyclic utilization of the prefabricated overlapped beam in the prior art is effectively solved, the construction efficiency is remarkably improved, and the technical support is provided for the large-scale industrial production of the members;
(2) Compared with cast-in-situ components, the prefabricated part containing the regenerated block is produced in a factory, so that the problem of on-site casting of the block is avoided, the on-site construction flow is simplified, and the on-site construction speed is improved; in addition, the construction quality of the recycled block/aggregate concrete prefabricated part produced by factories is ensured compared with that of the cast-in-situ part;
(3) The junction between the prefabricated part of new concrete and the overlapped part of new concrete is defined as an overlapped surface, and the regenerated block body of which part protrudes out of the overlapped surface can increase the roughness of the overlapped surface, improve the bonding performance of the overlapped surface, and hopefully omit the procedures of increasing the roughness, such as chemical treatment, roughening, and the like of the overlapped surface.
Drawings
Fig. 1 is a schematic view of the overall structure of a recycled block/aggregate concrete precast composite beam.
Fig. 2 is a partial enlarged view of a portion a in fig. 1.
Fig. 3 is a partial enlarged view of a portion B in fig. 1.
Fig. 4 is a partial enlarged view of a portion C in fig. 1.
Fig. 5 is a schematic view of an oblique web configuration.
Fig. 6 is a schematic view of Liang Dingshui flat tie bar (or beam bottom horizontal tie bar) construction.
Fig. 7 is a schematic structural view of a reinforcement cage formed by oblique web ribs, horizontal tie ribs at the bottom of the beam and longitudinal ribs at the bottom of the beam.
Fig. 8 is a schematic structural view of a recycled block/aggregate concrete precast composite beam with the precast portion constructed.
Fig. 9 is an overall schematic of a recycled block/aggregate concrete precast composite beam.
In the figure: 1-oblique web bars; 2-horizontal tie bars at the bottom of the beam; 3-beam bottom longitudinal ribs; 4-prefabricating part of new concrete; 5-regenerating a block; 6-Liang Dingshui flat tie bars; 7-beam top longitudinal ribs; 8-overlapping part of new concrete; 9-stirrup non-encryption area; 10-stirrup encryption area; 11-bending part; 12-end vertical section; 13-end hooks.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto, and it should be noted that the following processes, if any, are not specifically described in detail, can be implemented by those skilled in the art with reference to the prior art.
The invention provides a recycled block/aggregate concrete precast composite beam, which comprises a precast part and a composite part; the prefabricated part comprises an inclined web rib 1, a beam bottom horizontal tie rib 2, a beam bottom longitudinal rib 3, a prefabricated part new concrete 4 and a regenerated block 5, and the superposed part comprises a Liang Dingshui flat tie rib 6, a beam top longitudinal rib 7 and a superposed part new concrete 8, as shown in fig. 1 (note: the part of the prefabricated part new concrete 4 and the part of the superposed part new concrete 8 in the lower right corner are transparent for clearly showing the detailed structure of the beam; and fig. 2, 3 and 4 are partial enlarged views of the parts A, B and C in fig. 1 respectively).
Referring to fig. 1 and 7, two pairs of diagonal web members 1 are respectively and crosswise arranged on two sides of the recycled block/aggregate concrete precast composite beam. Each diagonal web member 1 is formed by bending a steel bar for several times, and each diagonal web member 1 includes several bending portions 11 and two end vertical sections 12 respectively located at a starting end and a tail end, as shown in fig. 5. Each of the bending portions 11 is overlapped with a pair of beam bottom horizontal tie bars 2 or a pair of Liang Dingshui horizontal tie bars 6, as shown in fig. 2 and 3, respectively. The end vertical section 12 is connected with the end vertical section 12 of the other inclined web 1 on the same side by welding, and the welding connection mode can enable the effect to be better, as shown in fig. 4. In some embodiments of the invention, only the end vertical segments 12 of all of the connections described above are welded together.
The beam top longitudinal ribs 7 and the beam bottom longitudinal ribs 3 are positioned in a stirrup cage formed by the Liang Dingshui flat tie ribs 6, the beam bottom horizontal tie ribs 2 and the inclined web ribs 1 and are abutted against the stirrup cage, as shown in figure 1. The beam bottom longitudinal ribs 3, the beam top longitudinal ribs 7 and the internal concrete are sleeved together through the beam top horizontal tie ribs 6, the beam bottom horizontal tie ribs 2 and the inclined web ribs 1 to form an integral stirrup cage so as to prevent the beam bottom longitudinal ribs 3, the beam top longitudinal ribs 7 and the internal concrete from expanding and deforming outwards in the stress process.
In some embodiments of the present invention, the horizontal tie bars 2 and Liang Dingshui are provided with end hooks 13 on the horizontal tie bars 6, and the two tie bars hook the longitudinal bars and the bending parts 11 through the end hooks 13 at two ends, as shown in fig. 2 and 3. The bending angle of the end hook 13 is 135 degrees, so that a better anchoring effect of the end hook 13 can be realized, and the horizontal tie bars 2 and Liang Dingshui at the bottom of the beam can exert the mechanical properties of the materials, as shown in fig. 6.
In some of the embodiments of the present invention, the straight section of the end hook 13 has a length of 75mm, as shown in fig. 6.
The recycled block/aggregate concrete precast laminated beam is provided with a stirrup non-encryption area 9 and a stirrup encryption area 10, as shown in fig. 1, the bending angle of each bending part 11 in the stirrup non-encryption area 9 is smaller than that of each bending part 11 in the stirrup encryption area 10, and the encryption area and the non-encryption area are distinguished by the magnitude of the bending angle, as shown in fig. 5. In some embodiments of the invention, each bend 11 in the stirrup non-encrypted zone 9 has a bend angle of 140.7 ° (except for the bend at the intersection of the non-encrypted zone 9 and the stirrup encrypted zone 10, where the bend angle is 150.2 °); each bending portion 11 of the stirrup encryption zone 10 has a bending angle of 159.8 ° (except for the bending portion adjacent to the end vertical section, where the bending angle of the bending portion is 169.9 °).
The diagonal web bars 1, the beam bottom horizontal tie bars 2 and the beam bottom longitudinal bars 3 are arranged in the construction of the prefabricated part, as shown in fig. 7, then the regenerated block 5 and the prefabricated part new concrete 4 are mixed and poured, the upper surface of the poured prefabricated part new concrete 4 is lower than Liang Dingshui flat tie bars 6, the gaps between the regenerated block 5 are filled by the prefabricated part new concrete 4, the regenerated block 5 partially protrudes from the upper surface of the prefabricated part new concrete 4, and in some embodiments of the invention, the ratio of the horizontal projection area of the protruding part to the upper surface area of the prefabricated part new concrete 4 is 1:3, as shown in fig. 8; the beam top horizontal tie bars 6 and the beam top longitudinal bars 7 are arranged during construction of the overlapping portion, and then overlapping portion new concrete 8 is poured above the prefabricated portion new concrete 4, and the height of the prefabricated portion new concrete 4 is larger than that of the overlapping portion new concrete 8, as shown in fig. 1 and 9.
In some embodiments of the invention, the length of the recycled block/aggregate concrete precast composite beam is 7.2m, the overall cross section is 350mm x 600mm (width x height), the cross sectional height of the precast portion of new concrete 4 is 450mm, and the cross sectional height of the composite portion of new concrete 8 is 150mm. The thickness of the concrete protective layer was 20mm. The length of the stirrup non-encryption zone 9 is 4.8m and the length of the stirrup encryption zone 10 is 1.2m. In the stirrup non-encryption area 9, the horizontal distance between two adjacent pairs of Liang Dingshui flat tie bars 6 along the length direction is 200mm, and the horizontal distance between two adjacent pairs of beam bottom horizontal tie bars 2 along the length direction is 200mm. In the stirrup encryption area 10, the horizontal distance between two adjacent pairs of Liang Dingshui flat tie bars 6 along the length direction is 100mm, and the horizontal distance between two adjacent pairs of beam bottom horizontal tie bars 2 along the length direction is 100mm.
In some embodiments of the invention, the oblique web bars 1, the beam bottom horizontal tie bars 2 and the Liang Dingshui horizontal tie bars 6 are HRB400 hot rolled steel bars with the diameter of 6mm, and the beam bottom longitudinal bars 3 and the beam top longitudinal bars 7 are HRB400 hot rolled steel bars with the diameter of 20mm. The strength grade of the prefabricated part of new concrete 4 and the superposed part of new concrete 8 is C35. The strength grade of the regenerated block 5 is C25, and the characteristic dimension is 100-200 mm.
In some embodiments of the invention, the prefabricated part new concrete 4 and the overlapped part new concrete 8 are recycled aggregate concrete doped with recycled coarse aggregate and engineering produced soil, and the mass ratio of the recycled coarse aggregate to the natural coarse aggregate in the prefabricated part new concrete and the overlapped part new concrete is 1:1, the mass ratio of engineering produced soil to natural sand is also 1:1. the ratio of the mass of the recycled block 5 to the total mass of the prefabricated portion of new concrete 4 and the superimposed portion of new concrete 8 is 1: 2.
The construction method of the recycled block/aggregate concrete precast composite beam provided by the embodiment comprises the following steps:
(1) The diagonal web bars 1, the beam bottom horizontal tie bars 2 and the beam bottom longitudinal bars 3 are installed to form a reinforcement cage, as shown in fig. 7;
(2) Installing a pouring die outside the reinforcement cage;
(3) Putting the regenerated block 5 fully wetted in advance into the pouring die at one time;
(4) Pouring a sufficient amount of new concrete 4 in the prefabricated part into the pouring mould, and fully vibrating the new concrete to finish the construction of the prefabricated part, as shown in fig. 8;
(5) Hoisting the prefabricated part of the recycled block/aggregate concrete prefabricated superposed beam to a specific placement part of a construction site, and then installing Liang Dingshui flat tie bars 6 and beam top longitudinal bars 7;
(6) And pouring new concrete 8 of the overlapped part to finish the construction of the overlapped part, as shown in fig. 1 or 9.
When the prefabricated part of the existing prefabricated superposed beam is produced, the conventional horizontal limb of the integral closed stirrup or the oblique hook at the top end of the side limb of the open stirrup of the combined closed stirrup can have great blocking effect on the throwing of the regenerated block, so that the construction efficiency is low. The embodiment of the invention adopts the oblique web bars, the horizontal tie bars at the bottom of the beam and the Liang Dingshui horizontal tie bars to replace the conventional stirrups (comprising the integral closed stirrups and the combined closed stirrups), and simultaneously combines the Liang Dingshui horizontal tie bars and the longitudinal bars at the top of the beam for post construction (namely, the method is arranged during construction of the overlapping part), thereby greatly facilitating the throwing of large-size regenerated blocks during the production of the prefabricated part (see figure 7, the blocks are not blocked when being thrown from top to bottom), and remarkably improving the construction efficiency.
As described above, the present invention can be preferably realized.
The embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the invention should be made and equivalents should be construed as falling within the scope of the invention.
Claims (9)
1. The utility model provides a prefabricated composite beam of regeneration block/aggregate concrete which characterized in that: the concrete pile comprises a prefabricated part and a superposed part, wherein the prefabricated part comprises an inclined web rib (1), a beam bottom horizontal tie rib (2), a beam bottom longitudinal rib (3), prefabricated part new concrete (4) and a regenerated block (5), and the superposed part comprises Liang Dingshui flat tie ribs (6), a beam top longitudinal rib (7) and superposed part new concrete (8);
the two pairs of the oblique web ribs (1) are respectively and crosswise arranged on the two side surfaces of the recycled block/aggregate concrete precast composite beam; each oblique web rib (1) is formed by bending a steel bar for a plurality of times, and each oblique web rib (1) comprises a plurality of bending parts (11) and two end vertical sections (12) respectively positioned at the starting end and the tail end; the beam bottom horizontal tie bars (2) and the Liang Dingshui horizontal tie bars (6) are respectively provided with two end hooks (13), and each bending part (11) is overlapped with the beam bottom horizontal tie bars (2) or the beam top horizontal tie bars (6); two adjacent end vertical sections (12) of a pair of oblique web bars (1) positioned on the same side are connected by welding;
the beam top longitudinal ribs (7) and the beam bottom longitudinal ribs (3) are positioned in a stirrup cage formed by the Liang Dingshui horizontal drawknot ribs (6), the beam bottom horizontal drawknot ribs (2) and the inclined web ribs (1) and are abutted against the stirrup cage;
the diagonal web ribs (1), the horizontal tie bars (2) at the bottom of the beam and the longitudinal bars (3) at the bottom of the beam are arranged during construction of the prefabricated part, then the regenerated blocks (5) and the prefabricated part new concrete (4) are mixed and poured, and gaps between the regenerated blocks (5) are filled with the prefabricated part new concrete (4); liang Dingshui flat tie bars (6) and beam top longitudinal bars (7) are arranged during construction of the overlapped part, and then new concrete (8) of the overlapped part is poured;
the recycled block/aggregate concrete precast superposed beam is provided with a stirrup non-encryption area (9) and a stirrup encryption area (10); the characteristic dimension of the regenerated block (5) is not smaller than 60mm, and the ratio of the mass of the regenerated block (5) to the total mass of the prefabricated part new concrete (4) and the overlapped part new concrete (8) is 1:4-1:1.
2. A recycled block/aggregate concrete precast composite beam according to claim 1, characterized in that: the bending angle of the end hook (13) is 135 degrees.
3. A recycled block/aggregate concrete precast composite beam according to claim 1, characterized in that: the bending angle of each bending part (11) in the stirrup non-encryption area (9) is smaller than that of each bending part (11) in the stirrup encryption area (10).
4. A recycled block/aggregate concrete precast composite beam according to claim 1, characterized in that: the prefabricated part new concrete (4) and the overlapped part new concrete (8) are recycled aggregate concrete mixed with recycled coarse aggregate and engineering produced soil; the recycled coarse aggregate partially or completely replaces natural coarse aggregate, and the engineering produced soil partially or completely replaces natural sand; the strength grade of the prefabricated part of the new concrete (4) is not lower than C30, and the strength grade of the overlapped part of the new concrete (8) is not lower than C25.
5. A recycled block/aggregate concrete precast composite beam according to claim 1, characterized in that: the regeneration block body (5) is partially protruded out of the upper surface of the prefabricated part new concrete (4), and the ratio of the horizontal projection area of the protruded part to the upper surface area of the prefabricated part new concrete (4) is not less than 1:3.
6. A recycled block/aggregate concrete precast composite beam according to claim 1, characterized in that: the regenerated block (5) is a block formed by crushing waste concrete after a old building, a road, a bridge or a dyke is dismantled and all or part of reinforcing steel bars and a protective layer are removed.
7. A recycled block/aggregate concrete precast composite beam according to claim 1, characterized in that: the length of the straight section of the end hook (13) is not smaller than the larger value of 10d and 75mm, wherein d is the diameter of the beam bottom horizontal tie bar (2) or the beam top horizontal tie bar (6).
8. A recycled block/aggregate concrete precast composite beam according to any one of claims 1 to 7, characterized in that: the length of the stirrup encryption area (10) is not smaller than the larger value of 2h and 500mm, wherein h is the beam height of the recycled block/aggregate concrete precast composite beam.
9. A method of constructing a recycled block/aggregate concrete precast composite beam as recited in any one of claims 1 to 8, comprising the steps of:
the method comprises the steps of (1) installing an oblique web rib (1), a beam bottom horizontal tie rib (2) and a beam bottom longitudinal rib (3) to form a reinforcement cage;
(2) Installing a pouring die outside the reinforcement cage;
(3) Putting a regenerated block (5) fully wetted in advance into the casting mold;
(4) Pouring a sufficient amount of new concrete (4) in the prefabricated part into the pouring mould, and fully vibrating the new concrete to finish the construction of the prefabricated part;
(5) Hoisting the prefabricated part of the recycled block/aggregate concrete prefabricated superposed beam to a specific placement part of a construction site, and then installing Liang Dingshui flat tie bars (6) and beam top longitudinal bars (7);
(6) And pouring new concrete (8) of the overlapped part, and finishing the construction of the overlapped part.
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| CN116752684A (en) * | 2023-06-20 | 2023-09-15 | 广东省建筑工程集团有限公司 | Novel cast-in-situ sloping plate recycled block concrete pouring construction process |
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