CN113152784B - Laminated beam and preparation method thereof - Google Patents
Laminated beam and preparation method thereof Download PDFInfo
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- CN113152784B CN113152784B CN202110380837.3A CN202110380837A CN113152784B CN 113152784 B CN113152784 B CN 113152784B CN 202110380837 A CN202110380837 A CN 202110380837A CN 113152784 B CN113152784 B CN 113152784B
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- 238000002360 preparation method Methods 0.000 title abstract description 10
- 210000002435 tendon Anatomy 0.000 claims abstract description 20
- 239000010410 layer Substances 0.000 claims description 90
- 239000000843 powder Substances 0.000 claims description 27
- 238000005452 bending Methods 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 8
- 230000002787 reinforcement Effects 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 7
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 239000011241 protective layer Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- E04C3/26—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 prestressed
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/04—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for lintels, beams, or transoms to be encased separately; Special tying or clamping means therefor
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/122—Machines for joining reinforcing bars
- E04G21/123—Wire twisting tools
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/14—Conveying or assembling building elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G2021/128—Prestressing each strand of a cable one by one to the same tension
Abstract
The invention discloses a laminated beam and a preparation method thereof, wherein the laminated beam is provided with three layers of concrete, the middle stress is small, the influence on the integral strength of the laminated beam by adopting common concrete (RC) is small, the manufacturing cost can be greatly reduced, the upper stress and the lower stress are both large, and the compressive strength and the cracking strain of the RPC are fully utilized, so that the whole beam body has good strength and durability, and the performance requirement of a large-span laminated beam is met. Truss pouring is carried out between two layers of concrete, so that the mutual compounding of contact positions of different concrete layers is enhanced, and the integrity is ensured. The prestressed tendons are arranged in the common concrete layer, so that the crack resistance of the middle layer common concrete of the laminated beam is further improved, the section size can be reduced, the dead weight is lightened, and the requirement of large span is further met. The preparation method can smoothly finish the construction of the whole laminated beam and meet the requirement of industrial application.
Description
Technical Field
The invention belongs to the technical field of building structure construction, and particularly relates to a laminated beam and a preparation method of the laminated beam.
Background
The superposed beam is a beam obtained by casting concrete twice, and is manufactured into a precast beam in a precast field for the first time; the second time is carried out on the construction site, and after the precast beam is hoisted and placed, concrete is poured and smashed to be connected into a whole.
With the rapid development of economy, building structures are also developed towards higher spans, and the requirement that the laminated beam can meet the requirement of large spans is met. However, the current large span composite beams must be cast with higher grade concrete, resulting in a significant cost.
Disclosure of Invention
The invention aims to: in order to reduce the cost of the laminated beam, the invention provides the laminated beam, which greatly reduces the cost and can meet the performance requirement of the large-span laminated beam.
Another object of the invention is to provide a method for manufacturing the above laminated beam.
The technical scheme is as follows: the invention relates to a laminated beam, which comprises: the concrete beam body is divided into three layers, namely a common concrete layer in the middle and active powder concrete layers on the upper side and the lower side; the prestressed tendons are arranged along the longitudinal direction of the concrete beam body and are poured into the common concrete layer; the trusses extend along the longitudinal direction of the concrete beam body and are divided into an upper group and a lower group, the upper and the lower surfaces of the ordinary concrete layer are respectively poured, a part of the cross section of each truss is embedded into the ordinary concrete layer, and the rest of the cross section of each truss is embedded into the active powder concrete layer; the longitudinal main ribs are distributed at the top and the bottom of the concrete beam body; the stirrups are poured into the concrete beam body, surround the trusses and the longitudinal main reinforcements, are longitudinally arranged at intervals and are parallel to each other; and the truss framework studs are transversely connected with the stirrups and are respectively used for supporting and positioning the upper and lower groups of trusses.
Wherein the truss comprises: three FRP chords extending in a straight line and parallel to each other, and three vertexes of the triangle being arranged along the longitudinal direction; the two zigzag web members are formed by bending common steel bars, bending points of the two zigzag web members are connected with the FRP chord members in a fiber and resin curing mode, and two edges of the two zigzag web members which are arranged in a triangle are observed along the longitudinal direction; and the plurality of transverse web members are connected between the two FRP chord members, and the third side of the triangle is arranged along the longitudinal observation of the transverse web members.
Specifically, the bending angle of the zigzag web members is 90 degrees, the bending points of the two zigzag web members are transversely aligned, and the transverse web members are transversely aligned with the bending points connected to the FRP chord members at the two sides.
Further, the upper truss and the lower truss are oppositely arranged, the FRP chord members connected with the two saw-tooth web members are embedded into the common concrete layer, and the rest FRP chord members are embedded into the active powder concrete layer.
And the prestressed tendons are poured at the middle lower position of the section height of the common concrete layer.
Further, the distance between the prestressed tendons and the lower surface of the common concrete layer is larger than the thickness of the protective layer of the concrete.
The stirrup is closed rectangle stirrup, a plurality of vertical main reinforcements connect respectively the upper and lower both sides of stirrup, and the four corners department of stirrup all is provided with vertical main reinforcement.
The prestress rib is FRP prestress rib, and is stretched to a prestress design value through a pretensioning method.
Specifically, the longitudinal main reinforcement adopts FRP reinforcement or steel-continuous fiber composite reinforcement, and the common concrete layer adopts common concrete casting with the strength not lower than C40.
Corresponding to the laminated beam, the preparation method provided by the invention comprises the following steps:
(1) Prefabricating a truss;
(2) Binding stirrups and lower-layer longitudinal main reinforcements on a pretensioning prestressing pedestal, binding lower-layer truss studs to proper positions of the stirrups according to the design positions of trusses, and binding and fixing lower-layer trusses through the truss studs;
(3) Installing a template and pouring a lower active powder concrete layer;
(4) Arranging a prestressed tendon at a design position, and tensioning the prestressed tendon to a design value through a pretensioning prestressing pedestal; binding truss studs of the upper layer to proper positions of stirrups, and binding and fixing the truss of the upper layer through the truss studs;
(5) Pouring a common concrete layer after the active powder concrete layer of the lower layer is solidified;
(6) And binding the longitudinal main ribs and the stirrups of the upper layer, pouring the active powder concrete layer of the upper layer after the common concrete layer is solidified, and removing the template after the concrete strength reaches more than 75% of the design value.
The beneficial effects are that: compared with the prior art, the laminated beam is provided with three layers of concrete, the middle stress is small, the influence of common concrete (RC) on the integral strength of the laminated beam is small, the manufacturing cost can be greatly reduced, the upper stress and the lower stress are large, the Reactive Powder Concrete (RPC) is adopted, the compressive strength of the RPC and the cracking strain of the RPC are fully utilized, the whole beam body has good strength and durability, and the performance requirement of the large-span laminated beam is met. Truss pouring is carried out between two layers of concrete, so that the mutual compounding of contact positions of different concrete layers is enhanced, and the integrity is ensured. The prestressed tendons are arranged in the common concrete layer, so that the crack resistance of the middle layer common concrete of the laminated beam is further improved, the section size can be reduced, the dead weight is lightened, and the requirement of large span is further met. The preparation method can smoothly finish the construction of the whole laminated beam and meet the requirement of industrial application.
Drawings
FIG. 1 is a schematic view of a longitudinal perspective of a composite beam of the present invention;
FIG. 2 is a schematic view of the transverse perspective of the composite beam of the present invention;
FIG. 3 is a schematic view of a truss structure;
FIG. 4 is a schematic view of the structure of the zigzag web member of the truss;
FIG. 5 is a schematic view showing the structure of the reactive powder concrete layer poured with the lower layer in the preparation step of the present invention;
fig. 6 is a schematic view of the structure of an active powder concrete layer prepared for casting an upper layer in the preparation step of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the concrete beam body of the laminated beam is different from other laminated beams, adopts three-layer concrete casting, and sequentially comprises active powder concrete (RPC), normal concrete (RC) and active powder concrete (RPC) from bottom to top, so as to respectively form a middle normal concrete layer 1 and active powder concrete layers 2 on the upper side and the lower side. The ordinary concrete layer 1 is least stressed in the middle position, and the strength is not lower than C40, so that the performance requirement of the laminated beam can be met. In practical application, the stress of the laminated beam is mainly concentrated on the active powder concrete layer 2 at the upper layer and the lower layer, and the active powder concrete layer 2 has higher compressive strength and cracking strain, and the bearing capacity and durability of the beam body can be fully ensured by arranging the active powder concrete layer on the upper side and the lower side.
The prestressed tendons 3 are FRP prestressed tendons which are arranged in the common concrete layer 1, and the arranged positions are arranged at the middle lower position of the height of the common concrete layer 1 so as to improve the cracking load of the common concrete and reduce the section size. Specifically, the middle position from the thickness position of the protective layer on the lower surface of the common concrete layer 1 to the height of the protective layer is used as the setting area of the prestressed tendons 3, and the final position is selected and determined according to the technical requirements of construction.
The truss 4 is a space truss, and referring to fig. 3 and 4, includes FRP chords 41, zigzag web members 42, and transverse web members 43. The zigzag web member 42 is formed by bending a common steel bar by 90 degrees, and the bending points are connected with the FRP chord member 41 in a fiber and resin curing mode to form nodes. The two zigzag web members 2 are aligned laterally, and the bending points are also connected to the lateral web members 43 at the nodes formed on the FRP chords 41 on both sides. The truss 4 is in a triangular structure when seen in the longitudinal direction, the transverse web members 43 are used as the bottom edges of the triangle, the bottom edges of the truss 4 above the prestressed tendons 3 are arranged at the upper side, the bottom edges of the truss 4 below the prestressed tendons 3 are arranged at the lower side, and the upper truss 4 and the lower truss 4 are oppositely arranged.
The two groups of trusses 4 are respectively arranged at the upper surface and the lower surface of the common concrete layer 1, which are in contact with the active powder concrete layer 2, a part of the cross section of each truss 4 is embedded into the common concrete layer 1, and the other part is embedded into the active powder concrete layer 2, so that the connection between the common concrete layer and the active powder concrete layer 2 is enhanced, and the laminated beam has good overall working performance.
The beam bottom and the beam top are provided with longitudinal main ribs 5, and FRP ribs or steel-continuous fiber composite ribs can be adopted specifically, the distribution of the longitudinal main ribs is designed and selected according to actual performance requirements, and the longitudinal main ribs 5 are generally arranged at four corners of the rectangular stirrups 6.
The stirrup 6 adopts a closed rectangular stirrup, integrally surrounds the truss 4 and the longitudinal main ribs 5, and ensures that the beam body has enough shear bearing capacity.
The laminated beam adopts a prefabricated preparation mode, and the specific method comprises the following steps:
(1) Prefabricating a truss 4;
as shown in fig. 5, the common steel bar is bent at 90 ° to form a zigzag web member 42, the bending points are connected with the FRP chord member 41 by fiber and resin curing to form a node, and the transverse web member 42 is connected in the same manner to obtain a truss 4 made of a mixed material of FRP and common steel bar.
(2) Binding stirrups 6 and longitudinal main ribs 5 on the lower layer on a pretensioning prestressing pedestal, binding truss stand ribs 7 on the lower layer to proper positions of the stirrups 6 according to the design positions of trusses 4, and binding and fixing the trusses 4 on the lower layer through the truss stand ribs 7;
(3) Installing a template and pouring a lower active powder concrete layer 2;
(4) As shown in fig. 6, a tendon 3 is arranged at a design position, and the tendon 3 is tensioned to a design value by a pretensioning prestressing pedestal; binding truss stand ribs 7 of the upper layer to proper positions of stirrups 6, and binding and fixing trusses 4 of the upper layer through the truss stand ribs 7;
(5) Pouring a common concrete layer 1 after the active powder concrete layer 2 of the lower layer is solidified;
(6) Referring to fig. 1, the longitudinal main bars 5 of the upper layer are bound and the stirrups 6 are bent and sealed, after the common concrete layer 1 is solidified, the active powder concrete layer 2 of the upper layer is poured, and when the concrete strength reaches more than 75% of the design value, the template is removed.
Claims (6)
1. A composite beam, comprising:
the concrete beam body is divided into three layers, namely a common concrete layer (1) in the middle and active powder concrete layers (2) on the upper side and the lower side;
the prestressed tendons (3) are arranged along the longitudinal direction of the concrete beam body and are poured into the common concrete layer (1); the prestress rib (3) is an FRP prestress rib and is stretched to a prestress design value through a pretensioning method;
the trusses (4) extend along the longitudinal direction of the concrete beam body and are divided into an upper group and a lower group, the upper groups and the lower groups are respectively poured on the upper surface and the lower surface of the common concrete layer (1), one part of the cross section of each truss (4) is embedded into the common concrete layer (1), and the other parts are embedded into the active powder concrete layer (2);
a plurality of longitudinal main tendons (5) distributed at the top and bottom of the concrete beam body;
a plurality of stirrups (6) which are poured in the concrete beam body, surround the trusses (4) and the longitudinal main ribs (5), are arranged at intervals in the longitudinal direction and are parallel to each other;
truss erection ribs (7) which are transversely connected with the stirrups (6) and are respectively used for supporting and positioning the upper and lower groups of trusses (4);
the truss (4) comprises:
three FRP chord members (41) extending straight and parallel to each other, the three FRP chord members (41) being arranged at three vertexes of a triangle as viewed in the longitudinal direction;
the two zigzag-type web members (42) are formed by bending common steel bars, bending points of the two zigzag-type web members (42) are connected with the FRP chord members (41) in a fiber and resin curing mode, and two edges of the two zigzag-type web members (42) which are arranged in a triangle are observed along the longitudinal direction;
a plurality of transverse web members (43) connected between the two FRP chord members (41), the transverse web members (43) being arranged in a triangular shape as viewed in the longitudinal direction;
the upper truss (4) and the lower truss (4) are oppositely arranged, the FRP chord members (41) connected with the two saw-tooth web members (42) are embedded into the common concrete layer (1), and the rest FRP chord members (41) are embedded into the active powder concrete layer (2);
the prestressed tendons (3) are poured at the middle lower position of the section height of the common concrete layer (1).
2. The laminated beam as claimed in claim 1, wherein the zigzag-shaped web members (42) are bent at an angle of 90 °, the bending points of the two zigzag-shaped web members (42) being laterally aligned, and the lateral web members (43) being laterally aligned with the bending points of the two side FRP chords (41).
3. The laminated beam according to claim 1, characterized in that the distance of the tendons (3) from the lower surface of the plain concrete layer (1) is greater than the protective layer thickness of the concrete.
4. The laminated beam according to claim 1, wherein the stirrup (6) is a closed rectangular stirrup, the plurality of longitudinal main bars (5) are respectively connected with the upper side and the lower side of the stirrup (6), and the longitudinal main bars (5) are arranged at four corners of the stirrup (6).
5. The composite beam according to claim 1, wherein the longitudinal main bars (5) are FRP bars or steel-continuous fiber composite bars, and the plain concrete layer (1) is cast with plain concrete having a strength not lower than C40.
6. A method of producing a laminated beam according to any one of claims 1-5, comprising the steps of:
(1) Prefabricating a truss;
(2) Binding stirrups and lower-layer longitudinal main reinforcements on a pretensioning prestressing pedestal, binding lower-layer truss studs to proper positions of the stirrups according to the design positions of trusses, and binding and fixing lower-layer trusses through the truss studs;
(3) Installing a template and pouring a lower active powder concrete layer;
(4) Arranging a prestressed tendon at a design position, and tensioning the prestressed tendon to a design value through a pretensioning prestressing pedestal; binding truss studs of the upper layer to proper positions of stirrups, and binding and fixing the truss of the upper layer through the truss studs;
(5) Pouring a common concrete layer after the active powder concrete layer of the lower layer is solidified;
(6) And binding the longitudinal main ribs and the stirrups of the upper layer, pouring the active powder concrete layer of the upper layer after the common concrete layer is solidified, and removing the template after the concrete strength reaches more than 75% of the design value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110380837.3A CN113152784B (en) | 2021-04-08 | 2021-04-08 | Laminated beam and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110380837.3A CN113152784B (en) | 2021-04-08 | 2021-04-08 | Laminated beam and preparation method thereof |
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| CN113152784A CN113152784A (en) | 2021-07-23 |
| CN113152784B true CN113152784B (en) | 2024-03-26 |
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| CN113831053B (en) * | 2021-08-24 | 2022-09-09 | 北京工业大学 | Gradient concrete material with small bending deformation and preparation method thereof |
| CN114704024A (en) * | 2022-04-27 | 2022-07-05 | 福建工程学院 | Novel laminated beam plate and preparation method thereof |
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| CN113152784A (en) | 2021-07-23 |
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