CN113021584A - Pre-tensioning prestressed hollow slab umbrella support splicing type core mold and construction process thereof - Google Patents
Pre-tensioning prestressed hollow slab umbrella support splicing type core mold and construction process thereof Download PDFInfo
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- CN113021584A CN113021584A CN202110241532.4A CN202110241532A CN113021584A CN 113021584 A CN113021584 A CN 113021584A CN 202110241532 A CN202110241532 A CN 202110241532A CN 113021584 A CN113021584 A CN 113021584A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/28—Cores; Mandrels
- B28B7/30—Cores; Mandrels adjustable, collapsible, or expanding
-
- 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
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- 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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
-
- 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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0002—Auxiliary parts or elements of the mould
- B28B7/0014—Fastening means for mould parts, e.g. for attaching mould walls on mould tables; Mould clamps
-
- 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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/348—Moulds, cores, or mandrels of special material, e.g. destructible materials of plastic material or rubber
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
-
- 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
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
- B28B7/364—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article of plastic material or rubber
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention discloses a pre-tensioning prestressed hollow slab umbrella brace splicing type core mould and a construction process thereof, and the pre-tensioning prestressed hollow slab umbrella brace splicing type core mould comprises the steps of template design and manufacture, core mould assembly, steel strand tensioning, bottom plate, web plate steel bar binding, core mould installation, top plate steel bar binding, side mould installation, concrete pouring, template dismantling, maintenance, steel strand releasing, lifting and storing of plate beams, and the pre-tensioning prestressed hollow slab umbrella brace splicing type core mould comprises a plastic outer membrane, rectangular steel pipes, a supporting mechanism and a fastening bandage. And is firmly bonded by using an adhesive tape while preventing the plastic film from wrinkling.
Description
Technical Field
The invention belongs to the technical field of bridge engineering construction, and particularly relates to a pre-tensioning prestressed hollow slab umbrella support splicing type core mould and a construction process thereof.
Background
In bridge construction or high-grade highways, a prestressed hollow slab beam structure is often adopted, the structure is simple, the spanning capability is high, and centralized prefabrication can be realized;
retrieved patent application publication No.: CN112323641A, a construction method of a pretensioned prestressing concrete hollow simply supported beam, which comprises concrete operation steps of template manufacturing and installation, steel bar processing and installation, prestressed bar installation and tensioning, hollow bar lower layer concrete pouring, core mould installation, hollow bar upper layer concrete pouring, core mould dismantling, concrete steam curing, prestressed steel bar releasing and tensioning, form removal and the like in sequence;
it has the following disadvantages: 1) in the concrete pouring process, concrete is easy to leak into the core mould, a large amount of labor force is needed for processing in the later core mould dismantling process, and meanwhile, longer working time is consumed; 2) the inflatable core mould is of a flexible structure, so that the prestressed hollow slab abdominal cavity protection layer is difficult to control in the construction process and is easy to damage in the installation process, and the manufacturing cost is higher.
Disclosure of Invention
The invention provides an umbrella support splicing type core mould of a pre-tensioning prestressed hollow slab and a construction process thereof, aiming at overcoming the defects in the technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pre-tensioning method prestressed hollow slab construction process comprises the following steps:
step 1, template design and manufacture: designing and manufacturing a prestressed hollow slab template and a supporting mechanism according to the size of a prestressed hollow slab, wherein the supporting mechanism adopts an umbrella-bracing type support with one section per 1-3 m;
step 5, core mold installation: after the binding of the bottom plate and the web plate reinforcing steel bars of the prestressed hollow slab is finished, binding is carried out in a quincunx shape by using protective layer cushion blocks according to the distance of 50-100 cm, core mold bottom surface supporting split heads are arranged on a pedestal according to the average distance of every 2-3 m, and a beam slab end mold is installed at the same time;
step 6, top plate steel bar binding: after the mandrel is installed, binding the steel bars of the top plate according to the steel bar binding requirement;
step 7, side die installation: after the beam plate reinforcing steel bars are completely bound, installing and reinforcing the hollow plate side die according to requirements;
step 8, pouring concrete: pouring is carried out from the tensioning end to the anchoring end;
step 9, template dismantling and maintenance: the hollow slab beam side mold and the umbrella-support type core mold can be disassembled after the concrete compressive strength reaches 2.5MPa, the concrete compressive strength reaches 2.5MPa at the normal temperature of 21-30 ℃ and reaches 2.5MPa after 8 hours, the hollow slab side mold and the umbrella-support type core mold can be disassembled, the core mold is disassembled, firstly, tension rods of two sections of the umbrella-support type support are disassembled, the core mold support is folded through drawing of an umbrella-support type center rod, then, the umbrella support is disassembled section by section, after the support is disassembled, square pipes are drawn out section by section, before the mold is disassembled, the top surface is covered with water for maintenance, after the mold is disassembled, the beam body is completely maintained by water for 3-5 days;
step 10, steel strand releasing and tensioning: releasing the tension of the prestressed steel strand according to a releasing and tensioning program of a pretensioning method, determining the strength of concrete through pressure test, ensuring the age of the concrete to be 7-10 days, cutting the steel strand at two ends of the member by using a cutting machine after the steel strand is released, cutting the steel strand at two ends of the member at the tensioning end firstly, cutting the steel strand at two ends of the member at the fixed end secondly, and brushing anti-rust paint at two ends of the steel strand to prevent rust;
step 11, hoisting and storing the plate girder: hoisting and placing the beam into a beam storage field by using a gantry crane slowly, performing foundation treatment on the field, padding square wood at the central line of a beam support, ensuring accurate position, arranging an upper beam and a lower beam on a vertical line, and keeping the stacking height of the beams not more than 3 plates;
a pre-tensioning prestressed hollow slab umbrella bracing piece type core mold comprises a plastic outer film, rectangular steel pipes, a supporting mechanism and fastening bandages, wherein a plurality of rectangular steel pipes are arranged on one side of the supporting mechanism, a plurality of fastening bandages are arranged on one side of each rectangular steel pipe, and the plastic outer film is arranged on one side of each fastening bandage; firstly, rectangular steel pipes are assembled on a core mold bottom plate and a bottom surface chamfer angle, then the rectangular steel pipes are assembled section by section through a supporting mechanism and connected into a whole, the support of the supporting mechanism is opened, the two ends of the support are tensioned by a pull rod to prevent the supports from moving and combining, after the core mold is assembled, the assembled core mold is integrally bound by a fastening binding band to form a whole, the core mold is integrally wound and wrapped by a plastic outer film, and the plastic outer film is firmly bonded by an adhesive tape to prevent the plastic outer film from wrinkling;
the supporting mechanism comprises a connecting fixed rod, the connecting fixed rod comprises an inserting hole and a supporting frame, the inserting hole is formed in two ends of the connecting fixed rod, two different sections of connecting fixed rods can be connected through the inserting hole, the rectangular steel pipe is supported through the supporting frame, and four supporting frames which can be folded and closed in one direction are respectively arranged at two ends of the connecting fixed rod in the supporting mechanism;
preferably, the support frame includes braced frame, supports the inner support, braced frame is inside to be equipped with two sets of support inner supports, support the inner support and include connecting axle, support connecting plate, support down tube I, support down tube II, vertical support rod, connecting axle one side is equipped with the support connecting plate, and support connecting plate one side is equipped with vertical support rod, and vertical support rod one side is equipped with supports down tube I, and the vertical support rod opposite side is equipped with supports down tube II, and the connecting axle is connected on connecting the dead lever, and the support connecting plate is fixed on the connecting axle, and vertical support rod, support down tube I, support down tube II are connected on the support connecting plate.
Preferably, the plastic outer film is two layers of plastic films, so that the core mold is prevented from being bonded with concrete and preventing slurry leakage from splicing of the rectangular steel pipe, the subsequent hollow plate is also protected from water retention, the plastic outer film is firmly bonded by using an adhesive tape, and the plastic films are prevented from wrinkling.
Preferably, the joint of the two sections of core moulds is wrapped by asphalt felt or color stripe cloth, the length of the asphalt felt or the color stripe cloth is 80-100 cm, and finally, the two sides of the joint are respectively bound firmly by fastening bands, so that the condition that the joint of the core moulds is staggered or leaked during the concrete pouring process is prevented.
Compared with the prior art, the invention has the beneficial effects that:
1) in the core mold combination and assembly process, the supporting mechanism is used for supporting, the rectangular steel pipes are bound through the fastening binding bands on the outer portion, the inner supports are removed through drawing the umbrella-support type supports after concrete is formed, and then the rectangular steel pipes are removed one by one for demolding, so that the problems that the core mold is slow in demolding, difficult in demolding, capable of damaging concrete and the like are effectively solved, the control is more convenient in the construction process, meanwhile, the rectangular steel pipes and the supporting mechanism can be repeatedly used, the material turnover utilization rate is improved, and the cost is reduced;
2) in the core mold assembling process, the assembled core mold is integrally bound to form a whole, then in order to prevent the core mold from being bonded with concrete and the splicing and leakage of slurry of square pipes and also in order to maintain and retain the water of a subsequent hollow plate, two layers of plastic films are used for integrally winding and wrapping the core mold, the plastic films are used for firmly bonding, and the plastic films are prevented from wrinkling, so that the problem of concrete leakage is solved well, the output of labor force can be greatly reduced in the later core mold disassembling process, and the working efficiency is improved;
3) at the joint of the two sections of core moulds, asphalt felt or color strip cloth is adopted for wrapping, and finally, fastening bands are used for binding the two sides of the joint part firmly, so that the occurrence of slab staggering or slurry leakage at the joint part of the core moulds in the concrete pouring process is prevented.
Drawings
FIG. 1 is a schematic structural view of a pre-tensioned prestressed hollow slab umbrella brace splicing type core mold and a pre-tensioned prestressed hollow slab umbrella brace splicing type core mold in the construction process thereof;
FIG. 2 is a schematic diagram of a rectangular steel pipe binding structure in FIG. 1;
FIG. 3 is a schematic view of the internal structure of the plastic outer film of FIG. 1;
FIG. 4 is a schematic view of the support frame of FIG. 3;
in the figure: 1. a plastic outer film; 2. a rectangular steel pipe; 3. a support mechanism; 31. connecting a fixed rod; 311. inserting holes; 312. a support frame; 3121. a support frame; 3122. supporting the inner support; 31221. a connecting shaft; 31222. supporting the connecting plate; 31223. supporting an inclined rod I; 31224. a support diagonal rod II; 31225. a vertical support bar; 4. and (5) fastening the binding band.
Detailed Description
For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 4.
Example 1:
a pre-tensioning method prestressed hollow slab construction process comprises the following steps:
step 1, template design and manufacture: designing and manufacturing a prestressed hollow slab template and a supporting mechanism according to the size of a prestressed hollow slab, wherein the supporting mechanism adopts an umbrella-bracing type support with one section per 1 m;
step 5, core mold installation: after the binding of the bottom plate and the web plate steel bars of the prestressed hollow slab is finished, binding is carried out in a quincunx shape by using protective layer cushion blocks according to the 60cm interval, core mold bottom surface supporting split heads are arranged on a pedestal according to the average interval of every 2m, and beam slab end molds are arranged at the same time;
step 6, top plate steel bar binding: after the mandrel is installed, binding the steel bars of the top plate according to the steel bar binding requirement;
step 7, side die installation: after the beam plate reinforcing steel bars are completely bound, installing and reinforcing the hollow plate side die according to requirements;
step 8, pouring concrete: pouring is carried out from the tensioning end to the anchoring end;
step 9, template dismantling and maintenance: the hollow slab beam side mold and the umbrella-support type core mold can be disassembled after the concrete compressive strength reaches 2.5MPa, the hollow slab side mold and the umbrella-support type core mold are disassembled at the normal temperature of 24 ℃ within 9 hours, the core mold is disassembled, firstly, tension rods of two sections of the umbrella-support type support are disassembled, the core mold support is retracted through the drawing of the umbrella-support type center rod, then, the umbrella supports are disassembled section by section, after the support is disassembled, square pipes are drawn out one by one, before the mold is disassembled, the top surface is covered with watering maintenance, after the mold is disassembled, the beam body is completely watered and maintained, and the maintenance time is 5 days;
step 10, steel strand releasing and tensioning: releasing the tension of the prestressed steel strand according to a releasing and tensioning program of a pretensioning method, determining the strength of the concrete through pressure testing, cutting the steel strand at two ends of the member by using a cutting machine after the steel strand is released, cutting the steel strand at two ends of the member at the tensioning end firstly, cutting the steel strand at two ends of the member at the fixed end secondly, and brushing anti-rust paint at two ends of the steel strand to prevent rust;
step 11, hoisting and storing the plate girder: hoisting and placing the beam into a beam storage field by using a gantry crane slowly, performing foundation treatment on the field, padding square wood at the central line of a beam support, ensuring the position to be accurate, arranging an upper beam and a lower beam on a vertical line, and stacking 3 plates on the beams;
a pre-tensioning prestressed hollow slab umbrella bracing piece type core mold comprises a plastic outer membrane 1, rectangular steel pipes 2, a supporting mechanism 3 and fastening bandages 4, wherein a plurality of rectangular steel pipes 2 are arranged on one side of the supporting mechanism 3, a plurality of fastening bandages 4 are arranged on one side of each rectangular steel pipe 2, and the plastic outer membrane 1 is arranged on one side of each fastening bandage 4; firstly, rectangular steel pipes 2 are assembled into a core mold base plate and a bottom surface chamfer angle, then the core mold base plate and the bottom surface chamfer angle are installed section by section through a supporting mechanism 3 and connected into a whole, the support of the supporting mechanism 3 is opened, the two ends of the support are tensioned by a pull rod, the support is prevented from moving and combining, after the core mold is assembled, the assembled core mold is integrally bound by a fastening bandage 4 to form a whole, the core mold is integrally wound and wrapped by a plastic outer film 1, the core mold is firmly bonded by an adhesive tape, and the plastic outer film 1 is;
the supporting mechanism 3 comprises a connecting fixed rod 31, the connecting fixed rod 31 comprises a splicing hole 311 and a supporting frame 312, the splicing hole 311 is arranged at two ends of the connecting fixed rod 31, two different sections of connecting fixed rods 31 can be connected through the splicing hole 311, the rectangular steel pipe 2 is supported through the supporting frame 312, and four supporting frames 312 which can be folded and closed in one direction are respectively arranged at two ends of the connecting fixed rod 31 in the supporting mechanism 3;
the supporting frame 312 comprises a supporting frame 3121 and a supporting inner frame 3122, two groups of supporting inner frames 3122 are arranged inside the supporting frame 3121, the supporting inner frames 3122 comprise a connecting shaft 31221, a supporting connecting plate 31222, a supporting inclined rod i 31223, a supporting inclined rod ii 31224 and a vertical supporting rod 31225, the supporting connecting plate 31222 is arranged on one side of the connecting shaft 31221, the vertical supporting rod 31225 is arranged on one side of the supporting connecting plate 31222, the supporting inclined rod i 31223 is arranged on one side of the vertical supporting rod 31225, the supporting inclined rod ii 31224 is arranged on the other side of the vertical supporting rod 31225, the connecting shaft 31221 is connected to a connecting fixing rod 31, the supporting connecting plate 31222 is fixed on the connecting shaft 31221, and the vertical supporting rod 31225, the supporting inclined rod i 31223 and the supporting inclined rod ii 312.
The plastic outer film 1 is two layers of plastic films, prevents the core mold from being bonded with concrete and prevents slurry leakage from the splicing seams of the rectangular steel pipes, also has the function of maintaining and retaining water for the subsequent hollow plate, is firmly bonded by using an adhesive tape, and prevents the plastic films from wrinkling.
And (3) wrapping the joint of the two sections of core moulds by using a felt which is 80cm, and finally, binding the two sides of the joint part by using a fastening binding band 4 to be firm, so that the condition of slab staggering or slurry leakage at the joint part of the core moulds in the concrete pouring process is prevented.
Example 2:
a pre-tensioning method prestressed hollow slab construction process comprises the following steps:
step 1, template design and manufacture: designing and manufacturing a prestressed hollow slab template and a supporting mechanism according to the size of a prestressed hollow slab, wherein the supporting mechanism adopts an umbrella-bracing type support with one section per 2 m;
step 5, core mold installation: after the binding of the bottom plate and the web plate reinforcing steel bars of the prestressed hollow slab is finished, binding is carried out in a quincunx shape by using protective layer cushion blocks according to the interval of 80cm, core mold bottom surface supporting split heads are arranged on a pedestal according to the average interval of every 2.5m, and beam slab end molds are arranged at the same time;
step 6, top plate steel bar binding: after the mandrel is installed, binding the steel bars of the top plate according to the steel bar binding requirement;
step 7, side die installation: after the beam plate reinforcing steel bars are completely bound, installing and reinforcing the hollow plate side die according to requirements;
step 8, pouring concrete: pouring is carried out from the tensioning end to the anchoring end;
step 9, template dismantling and maintenance: the hollow slab beam side mold and the umbrella-support type core mold can be disassembled after the concrete compressive strength reaches 2.5MPa, the hollow slab side mold and the umbrella-support type core mold are disassembled at the normal temperature of 25 ℃ for 9 hours, the core mold is disassembled, firstly, tension rods of two sections of the umbrella-support type support are disassembled, the core mold support is retracted through the drawing of the umbrella-support type center rod, then, the umbrella supports are disassembled section by section, after the support is disassembled, square pipes are drawn out one by one, before the mold is disassembled, the top surface is covered with watering maintenance, after the mold is disassembled, the beam body is completely watered and maintained, and the maintenance time is 4 days;
step 10, steel strand releasing and tensioning: releasing the tension of the prestressed steel strand according to a releasing and tensioning program of a pretensioning method, determining the strength of the concrete through pressure testing, cutting the steel strand at two ends of the member by using a cutting machine after the steel strand is released, cutting the steel strand at two ends of the tensioning end member firstly, cutting the steel strand at two ends of the fixed end member secondly, and brushing anti-rust paint at two ends of the steel strand to prevent rust;
step 11, hoisting and storing the plate girder: the hoisting is slowly hoisted to a beam storage field by using a gantry crane, the ground is treated, square wood is padded at the central line of a beam support, the position is accurate, the upper beam and the lower beam are on a vertical line, and the height of the beams is 3 plates.
Example 3:
a pre-tensioning method prestressed hollow slab construction process comprises the following steps:
step 1, template design and manufacture: designing and manufacturing a prestressed hollow slab template and a supporting mechanism according to the size of a prestressed hollow slab, wherein the supporting mechanism adopts an umbrella-bracing type support with one section per 3 m;
step 5, core mold installation: after the binding of the bottom plate and the web plate steel bars of the prestressed hollow slab is finished, binding is carried out in a quincunx shape by using protective layer cushion blocks according to the interval of 100cm, core mold bottom surface supporting split heads are arranged on a pedestal according to the average interval of every 3m, and beam slab end molds are arranged at the same time;
step 6, top plate steel bar binding: after the mandrel is installed, binding the steel bars of the top plate according to the steel bar binding requirement;
step 7, side die installation: after the beam plate reinforcing steel bars are completely bound, installing and reinforcing the hollow plate side die according to requirements;
step 8, pouring concrete: pouring is carried out from the tensioning end to the anchoring end;
step 9, template dismantling and maintenance: the hollow slab beam side mold and the umbrella-supporting core mold can be disassembled after the concrete compressive strength reaches 2.5MPa, the hollow slab side mold and the umbrella-supporting core mold can be disassembled at the normal temperature of 30 ℃ for 8 hours, the core mold is disassembled, firstly, the tension rods of the two sections of the umbrella-supporting support are disassembled, the core mold support is retracted through the pulling of the umbrella-supporting center rod, and then the umbrella-supporting is disassembled section by section. After the support is dismantled, the square pipes are drawn out one by one, before the form is dismantled, the top surface is covered with water for maintenance, after the form is dismantled, the beam body is completely watered and maintained, and the maintenance time is 5 days;
step 10, steel strand releasing and tensioning: releasing the tension of the prestressed steel strand according to a releasing and tensioning program of a pretensioning method, determining the strength of the concrete through pressure testing, cutting the steel strand at two ends of the member by using a cutting machine after the steel strand is released, cutting the steel strand at two ends of the member at the tensioning end firstly, cutting the steel strand at two ends of the member at the fixed end secondly, and brushing anti-rust paint at two ends of the steel strand to prevent rust;
step 11, hoisting and storing the plate girder: the hoisting is slowly hoisted to a beam storage field by using a gantry crane, the ground is treated, square wood is padded at the central line of a beam support, the position is accurate, the upper beam and the lower beam are on a vertical line, and the height of the beams is 3 plates.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (5)
1. A pre-tensioning method prestressed hollow slab construction process is characterized by comprising the following steps:
step 1, template design and manufacture: designing and manufacturing a prestressed hollow slab template and a supporting mechanism according to the size of a prestressed hollow slab, wherein the supporting mechanism adopts an umbrella-bracing type support with one section per 1-3 m;
step 2, core mold assembly: assembling an inner film on a core mold support frame with the same shape and size as the core mold, assembling a core mold bottom plate and a bottom chamfer by using a square tube, then assembling and connecting an umbrella support bracket section by section, opening the support of the umbrella support bracket, tensioning two ends of the support by using a pull rod, finally assembling a side mold and a top mold of the core mold, and after the core mold is assembled, integrally binding the assembled core mold by using a packing belt every 2-3 m to form a whole;
step 3, tensioning the steel strand: stretching the steel strand according to the steel strand stretching and requirements;
step 4, binding of the bottom plate and the web steel bars: placing the blanked bottom plate steel bars on a tensioning pedestal in place according to 8-12 bundles, laying steel strands on the bottom plate steel bars, binding the bottom plate steel bars according to binding intervals after tensioning the steel strands, and binding web plate steel bars after binding the bottom plate steel bars;
step 5, core mold installation: after the binding of the bottom plate and the web plate reinforcing steel bars of the prestressed hollow slab is finished, binding is carried out in a quincunx shape by using protective layer cushion blocks according to the distance of 50-100 cm, core mold bottom surface supporting split heads are arranged on a pedestal according to the average distance of every 2-3 m, and a beam slab end mold is installed at the same time;
step 6, top plate steel bar binding: after the mandrel is installed, binding the steel bars of the top plate according to the steel bar binding requirement;
step 7, side die installation: after the beam plate reinforcing steel bars are completely bound, installing and reinforcing the hollow plate side die according to requirements;
step 8, pouring concrete: pouring is carried out from the tensioning end to the anchoring end;
step 9, template dismantling and maintenance: the hollow slab beam side mold and the umbrella-support type core mold can be disassembled after the concrete compressive strength reaches 2.5MPa, the concrete compressive strength reaches 2.5MPa at the normal temperature of 21-30 ℃ and reaches 2.5MPa after 8 hours, the hollow slab side mold and the umbrella-support type core mold can be disassembled, the core mold is disassembled, firstly, tension rods of two sections of the umbrella-support type support are disassembled, the core mold support is folded through drawing of an umbrella-support type center rod, then, the umbrella support is disassembled section by section, after the support is disassembled, square pipes are drawn out section by section, before the mold is disassembled, the top surface is covered with water for maintenance, after the mold is disassembled, the beam body is completely maintained by water for 3-5 days;
step 10, steel strand releasing and tensioning: releasing the tension of the prestressed steel strand according to a releasing and tensioning program of a pretensioning method, determining the strength of the concrete through pressure testing, cutting the steel strand at two ends of the member by using a cutting machine after the steel strand is released, cutting the steel strand at two ends of the member at the tensioning end firstly, cutting the steel strand at two ends of the member at the fixed end secondly, and brushing anti-rust paint at two ends of the steel strand;
step 11, hoisting and storing the plate girder: the hoisting is slowly hoisted to a beam storage field by adopting a gantry crane, the field is treated by a foundation, square wood is padded at the central line of a beam support, the position is accurate, the upper beam and the lower beam are on a vertical line, and the stacking height of the beams is not more than 3 plates.
2. The pre-tensioning prestressed hollow slab construction process according to claim 1, characterized in that after core mold assembly is completed, a connection part of two core molds is wrapped by using a felt, the felt is 80-100 cm, and finally, fastening bands are used for respectively and firmly binding two sides of the joint part.
3. A pre-tensioning prestressed hollow slab umbrella bracing piece type core mold comprises a plastic outer membrane, rectangular steel pipes, a supporting mechanism and fastening bandages, and is characterized in that a plurality of rectangular steel pipes are arranged on one side of the supporting mechanism, a plurality of fastening bandages are arranged on one side of each rectangular steel pipe, and the plastic outer membrane is arranged on one side of each fastening bandage;
the supporting mechanism comprises a connecting fixing rod, the connecting fixing rod comprises an inserting hole and a supporting frame, the inserting hole is formed in the two ends of the connecting fixing rod, two sections of different connecting fixing rods can be connected through the inserting hole, the rectangular steel pipe is supported through the supporting frame, and four supporting frames which can be folded and closed in one direction are arranged at the two ends of the connecting fixing rod in the supporting mechanism.
4. The pre-tensioned prestressed hollow slab umbrella bracing piece type core mold as claimed in claim 1, wherein the supporting frame comprises a supporting frame and a supporting inner frame, two groups of supporting inner frames are arranged inside the supporting frame, the supporting inner frame comprises a connecting shaft, a supporting connecting plate, a supporting diagonal rod I, a supporting diagonal rod II and a vertical supporting rod, a supporting connecting plate is arranged on one side of the connecting shaft, a vertical supporting rod is arranged on one side of the supporting connecting plate, a supporting diagonal rod I is arranged on one side of the vertical supporting rod, a supporting diagonal rod II is arranged on the other side of the vertical supporting rod, the connecting shaft is connected to a connecting fixing rod, the supporting connecting plate is fixed on the connecting shaft, and the vertical supporting rod, the supporting diagonal rod I and the supporting diagonal rod II are connected.
5. The pre-tensioned pre-stressed hollow core panel umbrella bracing split core mold of claim 1, wherein the plastic outer film is two layers of plastic film.
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| CN202110241532.4A CN113021584A (en) | 2021-03-04 | 2021-03-04 | Pre-tensioning prestressed hollow slab umbrella support splicing type core mold and construction process thereof |
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| CN202110241532.4A CN113021584A (en) | 2021-03-04 | 2021-03-04 | Pre-tensioning prestressed hollow slab umbrella support splicing type core mold and construction process thereof |
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Application publication date: 20210625 |