CN112252586B - Prefabricated simply-supported beam with replaceable protective layer and manufacturing method thereof - Google Patents
Prefabricated simply-supported beam with replaceable protective layer and manufacturing method thereof Download PDFInfo
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- CN112252586B CN112252586B CN202011178093.9A CN202011178093A CN112252586B CN 112252586 B CN112252586 B CN 112252586B CN 202011178093 A CN202011178093 A CN 202011178093A CN 112252586 B CN112252586 B CN 112252586B
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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
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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Abstract
The invention relates to a prefabricated simply supported beam with a replaceable protective layer and a manufacturing method thereof, belonging to the technical field of building beam components, and comprising a protective layer bottom plate and protective layer side plates positioned on two sides of the protective layer bottom plate, wherein the protective layer side plates and the protective layer bottom plate form a U-shaped groove, a common concrete layer is poured in the U-shaped groove, a debonding layer is arranged between the U-shaped groove and the common concrete layer, and a steel reinforcement framework is arranged in the common concrete layer; the protective layer side plate and the protective layer bottom plate are both prefabricated ultrahigh-performance concrete plates, and a detachable structure is arranged between the protective layer side plate and the protective layer bottom plate. The invention improves the deformability of the tension area protective layer, simplifies the construction steps of the cast-in-place simply supported beam, improves the durability of the simply supported beam, has detachable protective layer, saves the later maintenance cost and effectively prolongs the service life of the structure.
Description
Technical Field
The invention relates to a prefabricated simply supported beam with a replaceable protective layer and a manufacturing method thereof, belonging to the technical field of building beam components.
Background
The common concrete has the characteristics of low bending strength and weak deformability, a plurality of concrete simple-supported beams are cracked in different degrees at a tensile zone protective layer, and cracks mostly appear in the form of wide single main cracks, so that a large amount of harmful media invade the interior of the concrete to corrode reinforcing steel bars, the safety performance and the durability of the simple-supported beams are greatly damaged, and the service life of the simple-supported beams is greatly reduced.
For frozen areas in northern China, the temperature difference is low in winter, a large amount of deicing salt is needed, although some concrete structures can be maintained regularly, the surfaces of the structures still have diseases such as pitted surfaces, corrosion, peeling, exposed ribs, rusty cracks and the like, even the steel bars are seriously corroded, the disease development speed is high, the comprehensive action of various diseases causes the serious weakening of the action of concrete members and steel bars, and the structure bearing capacity is greatly influenced.
The concrete structures in offshore, coastal and extreme environment areas of China also face the same problem, so that a reasonable preventive measure is necessary, the later maintenance and repair cost can be saved, and the service life of the structure can be effectively prolonged.
In addition, a large number of templates are needed in the traditional cast-in-place concrete simply supported beam construction process, the work load is large when the structure is used for supporting and removing the template, the turnover time of the templates is long, and the existing cast-in-place construction period is long.
Disclosure of Invention
Aiming at the characteristics that a common concrete material is low in bending tensile strength and a protective layer of a tensile area is easy to damage, the characteristics of a complex formwork supporting and formwork removing process in a simple beam pouring process and the environmental characteristics of a frozen area in northern China and a coastal area, the invention provides a prefabricated simple beam with a replaceable protective layer and a manufacturing method thereof, the deformation capacity of the protective layer of the tensile area is improved, the construction steps of cast-in-place simple beams are simplified, the durability of the simple beam is improved, the later maintenance cost is saved, and the service life of the structure is effectively prolonged.
Interpretation of terms:
1. the ultra-high performance concrete material comprises the following components: UHPC for short is an ultra-high toughness cement-based composite material which takes quartz sand, cement, fly ash and other materials as a matrix and takes three-dimensional disorderly oriented PVA fibers or steel fibers as a reinforcing material, the volume mixing rate of the fibers is about 2 percent, the material has obvious strain hardening characteristic, can convert the failure mode of single main crack cracking into the failure mode of a large number of micro-crack cracking when a common concrete simple-supported beam is subjected to bending failure, has the characteristic of strain hardening and excellent ductility and deformability, and can effectively control the crack width between 40 mu m and 60 mu m. Therefore, the anti-permeability performance of the ultra-high performance concrete material is far better than that of other concrete in a cracking state, so that the ultra-high performance concrete material has excellent durability and belongs to the existing material.
2. A common concrete layer: the invention is cast in situ by common concrete materials.
The invention adopts the following technical scheme:
on one hand, the invention provides a prefabricated simply supported beam with a replaceable protective layer, which comprises a protective layer bottom plate and protective layer side plates positioned on two sides of the protective layer bottom plate, wherein the protective layer side plates and the protective layer bottom plate form a U-shaped groove, a common concrete layer is poured in the U-shaped groove, a debonding layer is arranged between the U-shaped groove and the common concrete layer, and a steel reinforcement framework is arranged in the common concrete layer;
the protective layer side plate and the protective layer bottom plate are both prefabricated ultrahigh-performance concrete plates, and a detachable structure is arranged between the protective layer side plate and the protective layer bottom plate.
The ultra-high performance concrete slab is a plate-shaped structure formed by prefabricating an ultra-high concrete material (UHPC) in a factory, is uniformly poured, and can be put into use after standard curing for 28 days or steam curing for 3-7 days.
The common concrete material has better compression resistance and lower bending tensile strength, and the protective layer in a tensile area is easy to damage; the ultra-high performance concrete material is excellent in ductility and deformability and cracks with a large number of harmless microcracks, so that the use of ultra-high performance concrete in the tension zone can fully exert both material properties.
The ultra-high performance concrete has higher construction cost, and the ultra-high performance concrete is used as a template and a protective layer for a structure, so that the excellent characteristics of two materials are fully exerted on one hand, the engineering cost can be controlled in a reasonable range on the other hand, and meanwhile, the ultra-high performance concrete assembled protective layer is used for playing a role of a template and simplifying construction steps.
The invention is characterized in that a debonding layer is arranged between the U-shaped groove and the common concrete, namely the debonding layer is arranged between the ultra-high performance concrete plate and the common concrete layer, if no debonding treatment is adopted, because the common concrete layer and the ultra-high performance concrete layer are mutually bonded, when the common concrete layer is deformed and cracks are generated, the ultra-high performance concrete layer can generate cracks in a concentrated manner, and a part of cracks can form through cracks, so that the ultra-high performance concrete layer can not play a role in protecting the structure, after the interlayer mutual debonding treatment is carried out, the through cracks generated when the common concrete layer is deformed under stress due to mutual bonding can be avoided, the debonding treatment can ensure that the strain of the common concrete layer can be dispersed in the full-size range of the bottom surface protective layer of the ultra-high performance concrete, the single crack is cracked into a damage mode of a large number of harmless microcracks, and the formation of the through cracks is effectively inhibited, the harmful medium is prevented from invading, thereby protecting the structure.
Preferably, the steel reinforcement framework comprises longitudinal tension steel bars, stirrups and longitudinal erection steel bars, the longitudinal tension steel bars are located at the bottom of a common concrete layer, the longitudinal erection steel bars are located at the top of the common concrete layer, and the longitudinal tension steel bars and the longitudinal erection steel bars are located on the inner sides of the stirrups and are bound together with the stirrups.
Preferably, the thickness of the protective layer side plate and the protective layer bottom plate is more than 20 mm. The thicknesses of the protective layer side plates and the protective layer bottom plates, namely the thickness of the protective layer, can be determined according to the actual construction situation, and specifically refer to concrete structure design specification (GB 50010-.
Preferably, in order to facilitate disassembly, the protective layer bottom plate is uniformly provided with a plurality of trapezoidal teeth along the transverse direction, the bottom of the protective layer side plate is uniformly provided with a plurality of trapezoidal grooves matched with the trapezoidal teeth, and when the protective layer side plate is used, the trapezoidal teeth are embedded into the trapezoidal grooves and mutually locked to realize fixation of the trapezoidal teeth and the trapezoidal grooves; UHPC does not contain coarse aggregate, easy processing, not fragile.
Preferably, also be provided with the debonding layer between trapezoidal tooth and the trapezoidal slot, the gap between trapezoidal tooth and the trapezoidal slot is filled by the caulking material, and the debonding layer sets up and can avoid making protective layer bottom plate and protective layer curb plate bond each other because of pouring ordinary concrete layer, convenient dismantlement.
Preferably, a plurality of transversely distributed cylinder structures are arranged in the middle of the protective layer side plate in the U-shaped groove, the cylinder structures and the protective layer side plate are of an integral structure, and a debonding layer is also arranged between the cylinder structures and the common concrete layer.
Preferably, the inner side of the protective layer side plate is subjected to roughening treatment, so that the friction force between the protective layer side plate and a common concrete layer is increased, and the structural integrity is improved;
preferably, a bolt hole is reserved in the protective layer bottom plate, a bolt is pre-embedded in the bolt hole, and the length of the bolt extends into the common concrete layer.
Preferably, the protective layer bottom plate is designed in a sectional mode and comprises end plates at two ends and a plurality of middle plates, and the number of the middle plates can be flexibly set according to the length of the simply supported beam;
preferably, the number of end plates is 2, the number of middle plates is 1, each end plate is 1/4 the length of a simple strut beam, and the length of the middle plate is 1/2 the length of a simple strut beam.
Preferably, the debonding layer is made of a polytetrafluoroethylene film or is coated with a debonding agent, such as a yellow oil layer or a thin sponge layer.
Preferably, the joints between the end plates and the middle plate of the protective layer bottom plate and the joints between the protective layer side plates and the protective layer bottom plate are filled with concrete caulking materials;
preferably, the caulking material includes, but is not limited to, PVC ointments, PVC mastics, butyl sealer putties, modified asphalt ointment and mortar mixtures, asphalt rubbers, polyvinyl chloride mastics, cement emulsified asphalt mortar (CA mortar), resin mortar, and polyurethane-based sealants.
Preferably, the bolt on the middle part board is located the centre of middle part board and is close to board angle department, and the centre respectively arranges one row of bolt with being close to board angle department, and the bolt on the tip board is encrypted to be arranged, and encryption arrangement mode is: arranging a row of bolts at intervals of 150-250 mm along the length direction, wherein the specific encryption space can be adjusted according to the length of the end plate and the actual arrangement condition of stirrups, and the row of bolts comprises two or three bolts according to the transverse width of the simply supported beam;
preferably, three rows of bolts are arranged on the end plate, each row comprising two bolts, which may be increased according to the actual length of the end plate.
The cylinder structure is positioned at the position of the beam neutral axis, the middle part (namely midspan) on the protective layer side plate is provided with one cylinder structure, and two end parts are arranged in a encrypted manner;
preferably, the diameter of the cylindrical structure is 50-70 mm, the encryption distance at two end parts is 200-300 mm, the number of the cylindrical structure is at least 3, and the specific encryption distance and the number of the cylindrical structure can be adjusted according to the actual arrangement condition of stirrups and the length of the simply supported beam;
the trapezoidal teeth on the middle plate are positioned at the position, close to the plate corner, of the middle plate, the trapezoidal teeth on the end plate are arranged in an encrypted manner, and the trapezoidal grooves on the protective layer side plates are arranged corresponding to the trapezoidal teeth on the protective layer bottom plate;
for conveniently pouring and guaranteeing its bearing capacity, trapezoidal tooth width is more than 100mm, and the encrypted interval of trapezoidal tooth is 150 ~ 250mm on the end plate, and quantity is at least 3, can increase according to actual conditions, and the sufficient deformation in simple beam bottom is guaranteed to abundant anchor end plate.
By adopting the arrangement mode, the middle plate can be ensured to be fully deformed and slid when the simply supported beam bears the bending and pulling load, the effect of the ultra-high performance concrete is exerted, the bolt, the cylinder structure and the trapezoidal tooth-trapezoidal groove matched structure are arranged on the end plate in an encrypted manner, the anchoring effect can be achieved, and the integrity of the simply supported beam is ensured.
On the other hand, the invention also provides a manufacturing method of the prefabricated simply supported beam with the replaceable protective layer, which comprises the following steps:
(1) prefabricating an ultra-high performance concrete protective layer bottom plate and a protective layer side plate in a factory, and performing chiseling treatment on the inner side of the protective layer side plate;
(2) a debonding layer is arranged in the protective layer bottom plate, the protective layer side plate and between the end plate and the middle plate of the protective layer bottom plate, and is preferably a material such as a spread polytetrafluoroethylene film or a daubed debonding agent;
(3) assembling and connecting the protective layer bottom plate and the protective layer side plate, mutually locking the trapezoidal grooves at the bottom of the protective layer side plate and the trapezoidal teeth of the protective layer bottom plate to form a U-shaped groove structure, and filling caulking materials at seams;
(4) binding the steel bar framework in the U-shaped groove, arranging the position of the steel bar according to the requirements of concrete structure design Specification (GB 50010-2010) according to the actual engineering situation, and arranging the embedded bolt;
(5) pouring common concrete and curing, wherein standard curing is carried out for 28 days or steam curing is carried out for 3-7 days;
(6) and filling the surfaces of the joints between the end plates and the middle plate of the protective layer bottom plate and the joints between the protective layer side plates and the protective layer bottom plate with caulking materials, finishing the prefabricated simply supported beam, and using the hoisting.
According to the invention, the protective layer side plates and the protective layer bottom plates prefabricated by the ultra-high performance concrete material are used, additional formwork support and form removal are not needed, the construction steps are simplified, the construction efficiency is improved, and the prepared simply supported beam can be used after being hoisted on site.
The bottom of the common beam is pulled to easily generate cracks, so that the structural durability is influenced, therefore, the replacement mainly aims at the middle plate of the protective layer bottom plate, and only needs to manually or mechanically remove joint filling materials, disassemble bolts and push out the middle plate for replacement.
The invention is not described in detail in the prior art.
The invention has the beneficial effects that:
1) the invention prefabricates the ultrahigh-performance concrete with good crack control capability and high toughness into the assembled protective layer, can play the role of a simply supported beam template in the construction and pouring process of the simply supported beam, and also plays the role of an external protective layer, and the common reinforced concrete to be poured is combined with the ultrahigh-performance concrete protective layer into a whole after being condensed and hardened to form the composite section simply supported beam.
2) The invention utilizes the ultra-high performance concrete to manufacture the side plates and the bottom plate of the assembled protective layer, and the common reinforced concrete is poured in the side plates and the bottom plate, and the interlayer debonding treatment method is adopted between the ultra-high performance concrete protective layer and the common concrete layer, so that the deformation generated by the structural cracking can be distributed in the full-size range of the debonding section of the ultra-high performance concrete layer, the characteristics of multi-crack cracking and high toughness of the ultra-high performance concrete are fully exerted, the single crack cracking is converted into a damage mode of a large amount of harmless microcracks cracking, and the formation of through cracks is effectively inhibited.
3) The protective layer side plate and the protective layer bottom plate can play a role of a template in the pouring process, effectively solve the problem of template turnover in the construction process and effectively reduce the engineering cost; and be detachable construction between protective layer curb plate and the protective layer bottom plate, on the one hand can conveniently transport, and on the other hand when simple beam side or bottom surface receive external damage, can in time dismantle the change, has saved later stage maintenance cost, effectively prolongs beam structure's life.
In conclusion, the invention utilizes the excellent crack control capability and micro-crack self-healing capability of the ultra-high performance concrete material, can effectively improve the deformation capability and the waterproof and anti-permeability performance of the tension area protective layer, and prevents external harmful media from permeating into the simply supported beam to further cause the corrosion of the reinforcing steel bar. Meanwhile, in an extreme environment area, the surface damage of the simply supported beam is complex, the development speed is high, and the simply supported beam can be detached and replaced in time in a severe damage area of the simply supported beam, so that the later maintenance cost is saved, and the service life of the structure is effectively prolonged.
Drawings
FIG. 1 is a schematic longitudinal section structure of a prefabricated simply supported beam with replaceable protective layer according to the present invention;
FIG. 2 is a schematic view of the bottom structure of a prefabricated simply supported beam with replaceable protective layer according to the present invention;
FIG. 3 is a schematic diagram of a cross-sectional structure of the prefabricated simply supported beam with replaceable protective layer according to the present invention;
FIG. 4 is a schematic cross-sectional view of a protective layer side plate and a protective layer bottom plate according to the present invention;
FIG. 5 is a schematic view of the fitting relationship between the protective layer side plate and the protective layer bottom plate according to the present invention;
FIG. 6 is a schematic diagram of a bottom plate structure of the passivation layer of the present invention;
FIG. 7 is a schematic view of a protective layer side plate structure according to the present invention;
in the figure, 1-protective layer bottom plate, 1.1-trapezoidal tooth, 1.2-bolt hole, 1.3-end plate, 1.4-middle plate, 2-protective layer side plate, 2.1-trapezoidal groove, 3-common concrete layer, 4-debonding layer, 5-longitudinal tension steel bar, 6-stirrup, 7-longitudinal erection steel bar, 8-cylinder structure and 9-bolt.
The specific implementation mode is as follows:
in order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific examples, but not limited thereto, and the present invention is not described in detail and is in accordance with the conventional techniques in the art.
Example 1:
a prefabricated simply supported beam with replaceable protective layers is shown in figures 1-7 and comprises a protective layer bottom plate 1 and protective layer side plates 2 positioned on two sides of the protective layer bottom plate 1, wherein the protective layer side plates 2 and the protective layer bottom plate 1 form a U-shaped groove, a common concrete layer 3 is poured in the U-shaped groove, a debonding layer 4 is arranged between the U-shaped groove and the common concrete layer 3, and a steel reinforcement framework is arranged in the common concrete layer 3;
protective layer curb plate 2 and protective layer bottom plate 1 are prefabricated ultra high performance concrete slab, and are detachable construction between protective layer curb plate 2 and the protective layer bottom plate 1.
The ultra-high performance concrete slab is a plate-shaped structure formed by prefabricating an ultra-high concrete material (UHPC) in a factory, is uniformly poured, and can be put into use after standard curing for 28 days or steam curing for 3-7 days.
The common concrete material has better compression resistance and lower bending tensile strength, and the protective layer in a tensile area is easy to damage; the ultra-high performance concrete material is excellent in ductility and deformability and cracks with a large number of harmless microcracks, so that the use of ultra-high performance concrete in the tension zone can fully exert both material properties.
The invention has the advantages that the ultra-high performance concrete has higher construction cost, the ultra-high performance concrete is used as a template and a protective layer to be used in the structure, on one hand, the invention gives full play to the excellent characteristics of two materials, on the other hand, the invention can control the construction cost in a reasonable range, and simultaneously, the ultra-high performance concrete assembled protective layer is used to play a role of the template and simplify the construction steps.
The invention is characterized in that a debonding layer is arranged between the U-shaped groove and the common concrete, namely, the debonding layer 4 is arranged between the ultra-high performance concrete plate and the common concrete layer, if no debonding treatment is adopted, because the common concrete layer and the ultra-high performance concrete layer are mutually bonded, when the common concrete layer is deformed and cracks are generated, the ultra-high performance concrete layer generates cracks and concentrates, and partial cracks can form through cracks, so that the ultra-high performance concrete layer can not protect the structure, after the interlayer mutual debonding treatment is carried out, the through cracks generated when the common concrete layer is stressed and deformed due to mutual bonding can be avoided, the debonding treatment enables the strain of the common concrete layer to be dispersed in the full-size range of the ultra-high performance concrete bottom surface protective layer, single crack cracking is converted into a damage mode of a large number of harmless microcracks cracking, and the formation of the through cracks is effectively inhibited, the harmful medium is prevented from invading, thereby protecting the structure.
Example 2:
the utility model provides a prefabricated assembled simple beam structure of removable protective layer is shown as embodiment 1, and the difference is that steel skeleton includes vertical tension reinforcing bar 5, stirrup 6 and vertical erection reinforcing bar 7, and vertical tension reinforcing bar 5 is located 3 bottoms on ordinary concrete layer, and vertical erection reinforcing bar 7 is located 3 tops on ordinary concrete layer, and vertical tension reinforcing bar 5 and vertical erection reinforcing bar 7 all are located 6 inboards of stirrup and are tied up together with stirrup 6.
Example 3:
the prefabricated simply-supported beam with the replaceable protective layer is structurally as shown in embodiment 1, except that in the embodiment, the thicknesses of the protective layer side plate 2 and the protective layer bottom plate 1 are both 30 mm.
Example 4:
a prefabricated simply supported beam with a replaceable protective layer is structurally shown in embodiment 1, and is different in that for convenience in disassembly, as shown in figures 5, 6 and 7, a plurality of trapezoidal teeth 1.1 are uniformly arranged on a protective layer bottom plate 1 in the transverse direction, a plurality of trapezoidal grooves 2.1 matched with the trapezoidal teeth are uniformly arranged at the bottom of a protective layer side plate 2, and when the prefabricated simply supported beam is used, the trapezoidal teeth 1.1 are embedded into the trapezoidal grooves 2.1 and mutually locked to realize fixation of the trapezoidal teeth and the trapezoidal grooves;
also be provided with the debonding layer between trapezoidal tooth 1.1 and the trapezoidal slot 2.1, avoid making protective layer bottom plate and protective layer curb plate bond each other because of pouring ordinary concrete layer, convenient the dismantlement.
Example 5:
the utility model provides a prefabricated simple beam of removable protective layer, the structure is shown as embodiment 4, and the difference is that U type inslot portion protective layer curb plate middle part is provided with a plurality of transverse distribution's cylinder structure 8, and this cylinder structure 8 and protective layer curb plate 2 structure as an organic whole also are provided with the debonding layer between cylinder structure and the ordinary concrete layer, and this cylinder structure distributes in simple beam neutral axis position department, as shown in figure 4.
Example 6:
the prefabricated simply-supported beam with the replaceable protective layer is structurally as shown in embodiment 5, and is different from the prefabricated simply-supported beam with the replaceable protective layer in that the inner side of a protective layer side plate 2 is subjected to scabbling treatment, so that the friction force between the prefabricated simply-supported beam and a common concrete layer is increased, and the structural integrity is improved.
Example 7:
the structure of the prefabricated simply-supported beam with the replaceable protective layer is as shown in embodiment 6, except that a bolt hole 1.2 is reserved in a protective layer bottom plate 1, a bolt 9 is pre-embedded in the bolt hole 1.2, and the length of the bolt 9 extends into a common concrete layer 3.
Example 8:
a prefabricated simple supporting beam with replaceable protective layer is structurally shown in embodiment 7, except that a protective layer bottom plate 1 is designed in a sectional mode and comprises end plates 1.3 and 1 middle plate 1.4 at two ends, the length of each end plate 1.3 is 1/4 the length of the simple supporting beam, and the length of each middle plate 1.4 is 1/2 the length of the simple supporting beam.
Example 9:
a prefabricated simply supported beam with replaceable protective layer, which is constructed as shown in example 8, except that the debonding layer 4 is made of teflon film.
Example 10:
the structure of the prefabricated simply-supported beam with the replaceable protective layer is as shown in embodiment 9, except that the joint between the end plate 1.3 and the middle plate 1.4 of the protective layer bottom plate and the joint between the protective layer side plate 2 and the protective layer bottom plate 1 are filled with concrete caulking materials;
the caulking material uses polyurethane sealing material, and this material low cost just has better sealing performance and durability, demolishs when changing to protective layer curb plate or protective layer bottom board, can use organic solvent to clear away or use machinery to clear away, then only need transversely push out or demolish the bolt with the protective layer curb plate and transversely push out the protective layer bottom plate and can accomplish the change operation, convenient and fast.
Example 11:
a prefabricated simply supported beam with a replaceable protective layer, which has the structure shown in embodiment 10, except that bolts on the middle plate are positioned in the middle of the middle plate 1.4 and close to the plate corners, bolts on the end plates are arranged in an encrypted manner, and a row of bolts is arranged on the end plates every 200mm along the length direction, wherein the number of the rows is three, and as shown in fig. 5 and 6, one row comprises two bolts;
the cylinder structure 8 is positioned at the position of a beam neutral axis, the middle part (namely midspan) on the protective layer side plate is provided with one cylinder structure 8, two end parts are arranged in a encrypted manner, the diameter of the cylinder structure is 60mm, the encryption distance between the two end parts is 250mm, and the number of the cylinder structures is 3;
trapezoidal tooth 1.1 on the middle part board is located the middle part board and is close to board angle department, and trapezoidal tooth 1.1 on the tip board is encrypted and is arranged, and trapezoidal tooth width is 120mm, and the interval of encrypting of trapezoidal tooth is 200mm on the tip board, and quantity is 3, and trapezoidal slot 2.1 on the protective layer curb plate corresponds the setting with the trapezoidal tooth 1.1 of protective layer bottom plate.
By adopting the arrangement mode, the middle plate can be ensured to be fully deformed and slid when the simply supported beam bears the bending and pulling load, the effect of the ultra-high performance concrete is exerted, the bolt, the cylinder structure and the trapezoidal tooth-trapezoidal groove matched structure are arranged on the end plate in an encrypted manner, the anchoring effect can be achieved, and the integrity of the simply supported beam is ensured.
Example 12:
a manufacturing method of a prefabricated simply supported beam with a replaceable protective layer comprises the following steps:
(1) prefabricating an ultra-high performance concrete protective layer bottom plate 1 and a protective layer side plate 2 in a factory, and roughening the inner side of the protective layer side plate 2;
(2) a debonding layer, preferably a paved polytetrafluoroethylene film, is arranged in the protective layer bottom plate 1, the protective layer side plate 2 and between the end plate 1.3 and the middle plate 1.4 of the protective layer bottom plate;
(3) assembling and connecting the protective layer bottom plate 1 and the protective layer side plate 2, so that the trapezoidal groove at the bottom of the protective layer side plate 2 and the trapezoidal tooth of the protective layer bottom plate 1 are locked with each other to form a U-shaped groove structure, and filling caulking materials at seams;
(4) binding the steel bar framework in the U-shaped groove, arranging the position of the steel bar according to the requirements of concrete structure design Specification (GB 50010-2010) according to the actual engineering situation, and simultaneously embedding a bolt 9;
(5) pouring common concrete and curing, wherein standard curing is carried out for 28 days or steam curing is carried out for 3-7 days;
(6) and the joints between the end plates 1.3 and the middle plates 1.4 of the protective layer bottom plate and the joints between the protective layer side plates 2 and the protective layer bottom plate 1 are filled with caulking materials, the prefabricated simply supported beam is completed, and the hoisting can be used.
According to the invention, the protective layer side plates and the protective layer bottom plate prefabricated by the ultra-high performance concrete material are used, additional formwork support and form removal are not needed, the construction steps are simplified, the construction efficiency is improved, and the prepared simply supported beam can be used after being hoisted on site.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The prefabricated simply supported beam with the replaceable protective layer is characterized by comprising a protective layer bottom plate and protective layer side plates positioned on two sides of the protective layer bottom plate, wherein the protective layer side plates and the protective layer bottom plate form a U-shaped groove, a common concrete layer is poured in the U-shaped groove, a debonding layer is arranged between the U-shaped groove and the common concrete layer, and a steel reinforcement framework is arranged in the common concrete layer;
the protective layer side plates and the protective layer bottom plate are both prefabricated ultrahigh-performance concrete plates, and a detachable structure is arranged between the protective layer side plates and the protective layer bottom plate;
the protective layer bottom plate is designed in a sectional mode and comprises end plates at two ends and a plurality of middle plates;
the number of end plates is 2, the number of middle plates is 1, each end plate is 1/4 the length of a simple girder, and the middle plate is 1/2 the length of a simple girder.
2. The precast simply supported beam with replaceable protective layer according to claim 1, wherein the thickness of the protective layer side plate and the protective layer bottom plate is 20mm or more.
3. The prefabricated simply supported beam with the replaceable protective layer according to claim 1, wherein a plurality of trapezoidal teeth are uniformly arranged on the protective layer bottom plate along the transverse direction, and a plurality of trapezoidal grooves matched with the trapezoidal teeth are uniformly arranged on the bottom of the protective layer side plate;
a debonding layer is also arranged between the trapezoidal teeth and the trapezoidal grooves, and gaps between the trapezoidal teeth and the trapezoidal grooves are filled with caulking materials.
4. The prefabricated simply supported beam with the replaceable protective layer as claimed in claim 3, wherein the protective layer side plates in the U-shaped groove are provided with a plurality of transversely distributed cylindrical structures at the middle parts, the cylindrical structures and the protective layer side plates are integrated, and a debonding layer is also arranged between the cylindrical structures and the common concrete layer.
5. The precast simply supported beam with replaceable protective layer according to claim 4, wherein the inner side of the protective layer side plate is chiseled;
and bolt holes are reserved on the protective layer bottom plate, bolts are embedded in the bolt holes, and the length of each bolt extends into the common concrete layer.
6. The prefabricated simply supported beam with replaceable protective layers as claimed in claim 5, wherein the release layer is made of a polytetrafluoroethylene film or is coated with a release agent.
7. The precast simply supported girder with replaceable protective layer according to claim 6, wherein the joints between the end plates and the middle plate of the protective layer bottom plate and the joints between the protective layer side plates and the protective layer bottom plate are surface-filled with caulking materials of concrete;
the caulking materials include, but are not limited to, PVC ointments, PVC mastics, butyl mastics, modified asphalt ointment and mortar mixtures, asphalt rubbers, polyvinyl chloride mastics, cement emulsified asphalt mortar, resin mortar, and polyurethane-based sealants.
8. The precast simply supported beam with replaceable protective layer according to claim 7, wherein the bolts on the middle plate are positioned in the middle of the middle plate and near the plate corners, and the bolts on the end plates are arranged in a dense manner;
the cylinder structure is positioned at the position of the beam neutral axis, the middle part of the protective layer side plate is provided with one cylinder structure, and two end parts are arranged in a encrypted manner;
the trapezoidal teeth on the middle plate are positioned at the position, close to the plate corner, of the middle plate, the trapezoidal teeth on the end plate are arranged in an encrypted manner, and the trapezoidal grooves on the protective layer side plates are arranged corresponding to the trapezoidal teeth on the protective layer bottom plate;
the middle of middle part board and be close to board angle department and respectively arrange one row of bolt, the encryption of tip board arranges the mode and does: arranging a row of bolts at intervals of 150-250 mm along the length direction, wherein the row of bolts comprises two or three bolts;
the diameter of the cylindrical structure is 50-70 mm, the encryption distance between two end parts is 200-300 mm, and the number of the cylindrical structures is at least 3;
trapezoidal tooth width is more than 100mm, and the encryption interval of trapezoidal tooth on the tip board is 150 ~ 250mm, and the quantity is at least 3.
9. The method for manufacturing the prefabricated simply supported beam with the replaceable protective layer, which is characterized by comprising the following steps:
(1) prefabricating an ultra-high performance concrete protective layer bottom plate and a protective layer side plate in a factory, and performing chiseling treatment on the inner side of the protective layer side plate;
(2) the protective layer bottom plate, the protective layer side plates and the middle plate are respectively provided with a debonding layer;
(3) assembling and connecting the protective layer bottom plate and the protective layer side plate, mutually locking the trapezoidal grooves at the bottom of the protective layer side plate and the trapezoidal teeth of the protective layer bottom plate to form a U-shaped groove structure, and filling caulking materials at seams;
(4) binding a steel rib framework in the U-shaped groove, and arranging embedded bolts;
(5) pouring common concrete and curing, wherein standard curing is carried out for 28 days or steam curing is carried out for 3-7 days;
(6) and filling the surfaces of the joints between the end plates and the middle plate of the protective layer bottom plate and the joints between the protective layer side plates and the protective layer bottom plate with caulking materials, and prefabricating the simply supported beam.
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| DE102014008531A1 (en) * | 2014-02-13 | 2015-08-13 | Ewald Dörken Ag | Insulated building construction |
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| CN111809796A (en) * | 2020-08-14 | 2020-10-23 | 浙江华临建设集团有限公司 | Assembled concrete composite beam and construction method thereof |
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| CN101565986A (en) * | 2008-04-22 | 2009-10-28 | 张大长 | U-shaped precast concrete shell with inner ribs and manufacture method thereof |
| CN109680871A (en) * | 2019-01-28 | 2019-04-26 | 山东大学 | A kind of compound cross-section simply supported beam and preparation method thereof |
| CN110924421A (en) * | 2019-10-29 | 2020-03-27 | 国家电网有限公司 | Novel template-free corrosion-resistant UHPC-NC combined bearing platform and construction method thereof |
| CN111423169A (en) * | 2020-04-10 | 2020-07-17 | 哈尔滨工业大学 | High-toughness low-cost environment-friendly composite beam and construction method thereof |
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