CN113482239A - High-performance concrete permanent formwork square steel pipe combination beam and manufacturing method thereof - Google Patents
High-performance concrete permanent formwork square steel pipe combination beam and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 161
- 239000010959 steel Substances 0.000 title claims abstract description 161
- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 91
- 238000009415 formwork Methods 0.000 title claims abstract description 39
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 239000004567 concrete Substances 0.000 claims abstract description 90
- 239000002131 composite material Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 34
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000011083 cement mortar Substances 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 17
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 238000012360 testing method Methods 0.000 claims description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 238000005553 drilling Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
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- 238000004458 analytical method Methods 0.000 claims description 3
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- 238000010276 construction Methods 0.000 abstract description 39
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
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- 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
- E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
- E04C3/293—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures the materials being steel and concrete
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- C—CHEMISTRY; METALLURGY
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- E—FIXED CONSTRUCTIONS
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- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/185—Connections not covered by E04B1/21 and E04B1/2403, e.g. connections between structural parts of different material
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
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Abstract
The invention discloses a high-performance concrete permanent formwork square steel tube combined beam which consists of a high-performance concrete permanent formwork, a square steel tube and plain concrete, and solves the problems that a large amount of manpower, material resources and time cost are consumed in construction site formwork engineering, and the traditional formwork is discarded after being used to cause waste and the like. The invention provides a method for manufacturing a high-performance concrete permanent template square steel pipe composite beam, which is beneficial to improving the integral rigidity of the beam and the stress performance of a structure. The prefabricated square steel tube is used for replacing a tension steel bar and a sheared stirrup in a traditional steel reinforcement cage, the prefabricated square steel tube and an outer-layer high-performance concrete formwork are integrally cast together to form a permanent formwork of the composite beam, and only plain concrete is poured into the frame in the subsequent field construction. The method for connecting the combined continuous beam only needs to transport the permanent formwork to the site, connect the permanent formwork by using the connecting piece, the bolt and the nut before pouring the plain concrete, and then use cement mortar to plug the preformed hole of the outer formwork and trowel the preformed hole.
Description
Technical Field
The invention belongs to the technical field of composite beams, and particularly relates to a high-performance concrete permanent formwork square steel tube composite beam and a manufacturing method thereof.
Background
In the traditional construction technique, the concrete structure building comprises the following main construction steps: the method comprises the following three steps of formwork supporting, reinforcing steel bar binding and concrete pouring; selecting materials for a traditional template, wherein the template is usually made of wood and steel materials; wooden and steel templates often need to be supported in advance in the use process, need demolish after concrete pouring, and the process of supporting and demolishing often needs a large amount of manpower and materials, causes construction cost to rise.
In recent years, the economic level and the construction technology of China are continuously improved, and the construction industry is steadily advancing; green buildings have become the dominant melody of the current era; the prefabricated components meet the requirements of green buildings; the invention belongs to an assembled integral structural member, a template is made of high-performance concrete, the prefabrication work of the template is completed in a factory, a square steel pipe is embedded in the template, the square steel pipe is used for replacing a common reinforcement cage, and the site construction only needs to pour plain concrete; before concrete is poured into the traditional template, waste engine oil is brushed on the surface of the template, so that the appearance quality of the structure is influenced to a certain extent, the adhesion between the concrete and external plastering is also influenced to a certain extent, and the hollowing phenomenon is easy to occur; compared with the traditional template, the permanent template of the invention has the advantages that: on one hand, the permanent template and the post-cast concrete can realize common stress and coordinated deformation, improve the rigidity of the beam and achieve the aim of improving the stress performance of the structure; on the other hand, the permanent template can be used for omitting the process of template detachment, saving a large amount of labor cost and time cost, realizing green construction and having important research and practice significance for rapidly promoting and implementing building industrialization.
A large amount of manpower and material resources are required to be invested in the template engineering in the construction site, and the template engineering is a main cost project for building construction; the cost required by the template engineering accounts for more than half of the whole construction engineering; therefore, the template project affects the cost and the construction period of the whole project; the high-performance concrete permanent formwork square steel pipe combination beam can realize industrial production, is simple and convenient to mount and free of disassembly in the construction process, and has high degree of mechanization; the template is applied to actual engineering, so that the field assembly operation can be reduced, the construction period can be shortened, the construction cost can be reduced, the industrialization of the concrete structure construction process can be promoted, and the environment-friendly requirement of green construction can be met.
In the current time, our country is in an important stage of undergoing transformation of an economic system and vigorous development of science and technology; the building industry is more closely following the development pace of the times, conforms to the situation, develops and updates the original idea, changes the original production mode and converts the production result; the building construction method has important significance in promoting the building industry to develop industrially by combining the current situation; in recent years, the government of China has developed a series of policies, has made a series of policy measures, the purpose is to support vigorously and implement the industrialization of the building, the construction is green, thus realize the requirement of "four sections one environmental protection"; the main signs of building industrialization are organization management scientification, building design standardization, component and accessory production industrialization and construction mechanization; if the building templates are subjected to standardized production and industrialized production, the industrialization of the buildings in China is advanced to a new process, the construction level of the buildings in China is further improved, and finally a beautiful vision is realized, and the scientific and technical level is advanced to higher steps!
Disclosure of Invention
In order to solve the problems of waste of wooden templates and steel templates in the traditional construction, a large amount of manpower, material resources and time are consumed in the template engineering in the traditional site construction, the template turnover utilization rate is low, the construction efficiency is low and the like; the invention provides a high-performance concrete permanent template square steel tube composite beam and a manufacturing method thereof, and the method can realize common stress coordination deformation of a permanent template and post-cast concrete, thereby achieving the purpose of improving the stress performance of a structure; the method can also save the process of removing the template, save a large amount of labor cost, material cost and time cost, realize green construction, improve the construction efficiency, is suitable for industrialized mass production, and has important research and practice significance for rapidly promoting and implementing the building industrialization.
Technical scheme
A high-performance concrete permanent template square steel tube composite beam and its preparation method (see the description attached figure 1), the said high-performance concrete permanent template square steel tube composite beam is made up of high-performance concrete permanent template 1, square steel tube 2 in the permanent template, plain concrete 3 of the inside filling, in order to save the cost in the high-performance concrete 1 in the said permanent template, replace the aggregate of rubble with ordinary washing river sand and heavy calcium carbonate of 400 mesh; the permanent template consists of a high-performance concrete U-shaped template and a square steel pipe, the square steel pipe is embedded in the high-performance concrete U-shaped template and integrally cast with the U-shaped template during manufacturing, the thickness of the high-performance concrete template is 20mm, and the distance between the upper edge of a top plate of the square steel pipe and the upper edge of a side panel of the high-performance concrete U-shaped template is 20 mm; the invention uses the square steel tube to replace the common reinforcement cage, and the bottom plate of the square steel tube is a complete rectangular plate; rectangular holes are formed in the side panels of the square steel pipes at equal intervals, and the width of each hole is the same as the distance between the holes; square holes are formed in the top plate of the square steel pipe at equal intervals and in staggered arrangement with the side plate holes; plain concrete is filled in the composite beam.
The invention also relates to a method for continuously connecting the square steel pipes of the high-performance concrete permanent formwork in a combined manner (see the attached figure 2 in the specification), and the connecting structure of the combined continuous beam comprises the following steps: the concrete-reinforced concrete permanent formwork comprises a high-performance concrete permanent formwork 1, a square steel pipe 2 in the permanent formwork, plain concrete 3 filled inside, a square steel pipe type connecting piece 4, bolt holes 5, corresponding bolt holes 5' in a schematic diagram, and an outer layer permanent formwork preformed hole (a hole is formed in the inner square steel pipe and the outer high concrete) 6; the main method is a connecting method that a prefabricated connecting piece is embedded into square steel pipes at the end parts of two combined beams, a bolt rod penetrates through a plain concrete preformed hole and a connecting piece bolt hole, and then two ends of the bolt rod are screwed by a bolt nut; the connecting piece is prefabricated in a factory and is of a square steel tube type, and 8 bolt holes are respectively formed in four plate surfaces of the connecting piece at equal intervals; the 16 bolt rods are divided into two groups, each group comprises 8 bolt rods, and the length of each bolt rod is cut according to the height and the width of the combined beam; the diameter of the nut is matched with the diameter of the bolt rod.
As a preferred technical scheme of the invention, when the connecting piece of the high-performance concrete permanent template square steel pipe combined continuous beam is manufactured, 8 bolt holes are designed for each plate surface according to the stress requirement.
A high-performance concrete permanent template square steel pipe composite beam and a manufacturing method thereof comprise the following steps:
firstly, preparing high-performance concrete required in an outer permanent template of a composite beam, and carrying out experimental analysis on the compressive strength and the flexural strength of a high-performance concrete test piece to obtain the optimal mixing ratio; in the traditional preparation method, quartz sand and quartz powder are used, and in order to consider the cost, the quartz sand is replaced by water-washed river sand, and the quartz powder is replaced by 400-mesh heavy calcium carbonate powder; the properties of the replaced materials are similar to those of the raw materials, and the cost can be greatly reduced;
secondly, determining the size of the square steel pipe, and determining the height and the width of the square steel pipe according to the size of the composite beam;
thirdly, calculating the thickness of the square steel tube bottom plate (the square steel tube bottom plate equivalently replaces the bent steel bars) by designing the bending moment born by the combined beam;
fourthly, customizing a square steel pipe, and customizing the square steel pipe according to the height, the width and the thickness of the square steel pipe and the length of the beam;
fifthly, calculating the number of holes and the hole distance of the square steel tube web plate (the square steel tube web plate equivalently replaces sheared stirrups) by designing the shearing force born by the composite beam;
sixthly, drilling a hole on the top plate of the square steel pipe, and drilling holes at staggered positions of the top plate of the square steel pipe and the web plate according to the position of the hole on the web plate of the square steel pipe (so that the through effect of three-side holes is avoided and the mechanical property is not influenced);
seventhly, mixing the high-performance concrete, and mixing the high-performance concrete used in the mixing step by using a horizontal shaft forced mixer;
eighthly, supporting the outer template and the inner template of the bottom plate of the high-performance concrete permanent template, and pouring the bottom plate of the high-performance concrete permanent template
Ninth, adopting a high-frequency vibrator to fully and permanently build high-performance concrete on the template bottom plate;
tenth, removing the inner mold of the bottom plate after the bottom plate of the high concrete template is poured to reach certain strength, placing the square steel tube bottom plate on the bottom plate of the high concrete template in the middle, sealing the square steel tube web plate hole inside the steel tube by using a wood template, using the square steel tube web plate as an inner template of the side plate of the high concrete template, and pouring the side plate of the high concrete permanent template;
step eleven, adopting a high-frequency vibrator to fully heighten the high-performance concrete of the side panel of the permanent concrete template;
the twelfth step, the high-performance concrete template is maintained, and the permanent template is different from the ordinary plain concrete in properties and needs to be demolded and maintained in advance;
step ten, when the high concrete template reaches a certain strength, mixing plain concrete and pouring the plain concrete into the high concrete template;
fourteenth, maintaining the composite beam member;
a method for continuously connecting square steel pipes of a high-performance concrete permanent formwork in a combined mode comprises the following steps:
the first step, before pouring plain concrete into the interior, embedding the prefabricated connecting piece into the square steel tube of the left beam;
secondly, sleeving the square steel pipe of the right beam on the connecting piece;
thirdly, aligning the aperture centers of 8 bolt holes on the connecting piece with the aperture centers of the outer layer permanent template preformed holes of the left beam and the right beam one by one;
fourthly, intercepting a bolt rod with a corresponding length, penetrating into the outer permanent template, penetrating into the connecting piece, penetrating out of the connecting piece and penetrating out of the permanent template;
fifthly, screwing two ends of the bolt rod by using a bolt nut;
sixthly, plugging and leveling the preformed hole of the outer layer permanent template by using cement mortar;
seventhly, mixing plain concrete and pouring the plain concrete into the plain concrete;
and eighthly, maintaining the composite beam member.
Has the advantages that: compared with the prior art, the square steel tube combination beam adopting the high-performance concrete permanent template and the manufacturing method thereof have the following technical effects:
1. the square steel pipe composite beam adopting the high-performance concrete permanent formwork and the manufacturing method thereof can solve the problem of waste of the wooden formwork and the steel formwork in the traditional construction, reduce building waste, meet the requirement advocated by green construction and reduce the pollution to the environment;
2. the square steel tube composite beam adopting the high-performance concrete permanent template and the manufacturing method thereof can solve the problem that the template engineering consumes a large amount of manpower, material resources and time in the traditional site construction, the process of template detachment can be omitted when the permanent template is integrally cast with plain concrete on site, a large amount of manpower cost, material resource cost and time cost are saved, and the square steel tube composite beam is suitable for industrial large-scale production;
3. the square steel tube combination beam adopting the high-performance concrete permanent template and the manufacturing method thereof can solve the problems of low template turnover utilization rate and low construction efficiency, the permanent template and the plain concrete are integrally cast, the template does not need to be recycled, and the template is transported to a construction site to finish the step of pouring the plain concrete, so that the construction efficiency is greatly improved;
4. the square steel tube composite beam adopting the high-performance concrete permanent template and the manufacturing method thereof can improve the mechanical property of the beam; before concrete is poured into the traditional template, waste engine oil is brushed on the surface of the template, so that the appearance quality of the structure is influenced to a certain extent, the adhesion between the concrete and external plastering is also influenced to a certain extent, and the hollowing phenomenon is easy to occur; compared with the traditional template, the permanent template and the post-cast concrete can realize common stress and coordinated deformation, improve the rigidity of the beam and achieve the aim of improving the stress performance of the structure;
5. the square steel tube composite beam adopting the high-performance concrete permanent template and the manufacturing method thereof can improve the engineering quality; because the prefabricated template is prefabricated in a factory, the prefabricated template bears fewer uncontrollable factors, reduces errors caused by site construction to a certain extent, improves the construction precision and is beneficial to enhancing the quality of a building;
6. the prefabricated connecting method for the construction of the continuous beam by adopting the high-performance concrete permanent formwork and the square steel pipe combination is simple, has low technical requirements on site construction, and can improve the construction efficiency and the construction quality.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention.
FIG. 1 is a schematic view of the overall appearance of a composite beam using a high-performance concrete permanent formwork square steel tube composite beam according to the present invention.
FIG. 2 is a left sectional view of the composite beam using the high-performance concrete permanent formwork square steel tube composite beam according to the present invention.
FIG. 3 is a front sectional view (inside cut) of the composite beam using the high-performance concrete permanent form square steel tube composite beam according to the present invention.
FIG. 4 is an elevational view, a cross section (cutting steel tube web) of the composite beam of the invention using the high performance concrete permanent form square steel tube composite beam.
FIG. 5 is a top sectional view of the composite beam of the present invention using the high performance concrete permanent form square steel tube composite beam.
FIG. 6 is a perspective view of the connecting member of the present invention using the high performance permanent formwork square steel tube combination continuous beam.
FIG. 7 is a top sectional view of the joint of the combined continuous beam using the high-performance concrete permanent formwork square steel tube combined continuous beam according to the present invention.
FIG. 8 is a top view of the joint of the continuous beam of the invention using the high-performance concrete permanent form and the square steel tube combination continuous beam.
FIG. 9 is a top sectional view of the connecting member of the present invention using the high performance permanent formwork square steel tube combination continuous beam.
FIG. 10 is a front sectional view of the joint of the combined continuous beam using the high-performance permanent concrete form square steel tube combined continuous beam according to the present invention.
FIG. 11 is a front view of the joint of the continuous beam made of the high-performance concrete permanent formwork and the square steel tube.
FIG. 12 is a front sectional view of the connecting member of the present invention using the high performance permanent formwork square steel pipe combination continuous beam.
Description of reference numerals: 1-high-performance concrete permanent formwork, 2-square steel pipe, 3-plain concrete, 4-connecting piece, 5-bolt hole, 5' -corresponding bolt hole and 6-outer layer permanent formwork preformed hole.
Detailed Description
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
firstly, preparing high-performance concrete required in an outer permanent formwork of a composite beam:
preparing high-performance concrete required in an outer permanent template of the composite beam, and carrying out experimental analysis on the compressive strength and the flexural strength of a high-performance concrete test piece to obtain the optimal mixing ratio; in the traditional preparation method, quartz sand and quartz powder are used, and in order to consider the cost, the quartz sand is replaced by water-washed river sand, and the quartz powder is replaced by 400-mesh heavy calcium carbonate powder; the properties of the replaced materials are similar to those of the raw materials, and the cost can be greatly reduced; after multiple times of adaptation, the optimal matching ratio is finally obtained and is shown in table 1;
TABLE 1 mixing ratio of high-performance concrete
And (3) compression test: three cube test blocks of 100mm are made of high-performance concrete, and the compression strength of the cube is measured by using a hydraulic servo testing machine; the average compression strength of the high-performance concrete is 129.85 MPa; three cubic test blocks of 100mm are made of common concrete, and the average compressive strength of the common concrete test blocks is 28.25 MPa; it can be seen that the compressive strength of the high-performance concrete is much higher than that of the common concrete;
and (3) bending resistance test: prism test pieces of 100mm multiplied by 400mm are respectively manufactured by high-performance concrete and common concrete, the breaking strength of the high concrete is obtained through a four-point bending test, the average value of the breaking strength is 12.51MPa, and the average value of the breaking strength of the common concrete is 5.52 MPa.
Second, make permanent template of the permanent template square steel tube combination beam of high-performance concrete
The method comprises the following steps: determining the height and width of the square steel pipe according to the size of the composite beam;
the width of the square steel pipe is equal to the width of the beam, the thickness of the plates at two sides is equal to (2 x 20 is equal to 40mm), and the height of the square steel pipe is equal to the thickness of the beam, the thickness of the template at the bottom side is equal to (20mm), and the thickness of the protective layer is equal to (20 mm);
step two: calculating the thickness of the square steel tube bottom plate by designing the bending moment born by the combined beam (the square steel tube bottom plate equivalently replaces the bent steel bar);
the bending moment born by the combined beam is designed, the model of the bottom steel plate is determined, and the thickness of the bottom steel plate is adjusted to equivalently replace the flexural steel bar, so that the thickness of the bottom steel plate of the square steel pipe is obtained;
step three: customizing a square steel pipe; customizing the square steel pipe according to the height, the width and the thickness of the square steel pipe and the length of the beam;
step four: calculating the number of holes and the hole-opening distance of the square steel tube web by designing the shearing force borne by the composite beam (the square steel tube web equivalently replaces the sheared stirrup);
the most economical opening size (opening number and opening distance) of the square steel tube web is obtained by designing the shearing force born by the composite beam; the model of square steel tube web and bottom steel sheet is the same, thickness is the same, when utilizing square steel tube web to replace the stirrup that shears, and the anti shear capacity of whole square steel tube web face is far greater than the design value of anti shear capacity, so need trompil on square steel tube web face, the purpose is: the steel is saved, and the bonding effect between the steel pipe web and the outer high-performance concrete is enhanced;
step five: a top plate of the square steel pipe is provided with a hole; according to the hole opening position of the web plate of the square steel pipe, holes are formed in the staggered position of the top plate of the square steel pipe and the hole opening of the web plate (the through effect of three-side hole opening is avoided, and the mechanical property is not influenced);
the hole opening size and the hole opening position of the upper steel plate of the square steel pipe are staggered according to the hole opening position of the side panel, so that three-side openings of the steel pipe are prevented from having a through effect at the same position, and the mechanical property of the square steel pipe is prevented from being influenced; the square steel tube top plate is provided with the hole, so that the pouring and the vibrating of plain concrete can be facilitated, the effects of saving steel and reducing cost can be achieved, and the method achieves two purposes;
step six: mixing the high-performance concrete; mixing the high-performance concrete used in the concrete by using a horizontal shaft forced mixer;
the high-performance concrete is easy to be stirred unevenly in the stirring process and has high cohesiveness, so a horizontal shaft forced stirrer and other novel stirrers are used in the stirring process;
step seven: supporting the external form and internal form of high-concrete permanent form, and pouring the high-performance concrete permanent form
Step eight: adopting a high-frequency vibrator to fully and permanently build high-performance concrete on a template bottom plate;
step nine: after the bottom plate of the high-concrete template is poured to reach a certain strength, removing the bottom plate internal mold, placing the square steel tube bottom plate on the high-concrete template bottom plate in the middle, sealing the square steel tube web plate hole in the steel tube by using a wood template, using the square steel tube web plate as an internal template of the high-concrete template side plate, and pouring the side plate of the high-concrete permanent template;
step ten: adopting a high-frequency vibrator to fully heighten the high-performance concrete of the side panel of the permanent concrete template;
step eleven: curing the high-performance concrete template;
the high-performance concrete used in the invention has different properties of shrinkage and creep from common concrete, so that the process of curing is required to be emphasized during construction, particularly the early wet curing process; for the permanent template of the composite beam, the template is required to be removed in advance for maintenance; the curing time is not less than 14 days, the internal temperature of the concrete is less than or equal to 750 ℃ during the curing period, and the internal and external temperature difference of a test piece is controlled to be not more than 250 ℃; the early wet curing water-collecting spraying mode avoids the excessive temperature difference inside and outside the concrete, thereby causing the concrete to generate cracks.
Thirdly, pouring plain concrete in the inner core of the composite beam
The strength grade of the common concrete in the core of the composite beam is selected according to the actual design bearing capacity requirement;
in the process of pouring the common concrete at the core inside the composite beam, the impact template cannot be poured intensively when the concrete is poured into a mold, and the concrete is poured within five hours; the vibration duration time is required to enable the concrete surface to generate floating slurry without bubbles and sinking; after the concrete is finally set, covering a plastic film on the surface of the beam to reduce water loss, watering regularly to ensure humidity, and carrying out a loading test after curing for 28 days.
Fourthly, the invention also comprises a method for connecting the high-performance concrete permanent template square steel pipe combined continuous beam
The high-performance concrete permanent template square steel pipe combined beam is adopted, and the beams can be divided into two types according to the number of supports of the flexural members; one is a simply supported beam and the other is a continuous beam; the simple beam is a single span structure which only has two ends supported on the pillars and mainly bears bending moment, wherein two ends of the beam are lapped on two supports, one end of the beam is hinged and the other end of the beam is fixed; the continuous beam is provided with three or more supports, can be simplified into a static indeterminate structure calculation mode, and is also provided with a beam supported by the columns at the middle part on the basis of the simple supported beam; when the simply supported beam is constructed, the connection problem of the beam is not considered, and the beam is only required to be lapped on the two pillars; for the continuous beam, besides the pillar supports at the two ends, a main part is often supported in the span, which needs to consider the connection problem of the continuous beam;
the method comprises the following steps: repeatedly embedding the prefabricated connecting piece into the square steel pipe of the left beam before pouring plain concrete into the interior of the composite beam;
step two: sleeving the square steel pipe of the right beam on the connecting piece;
step three: aligning the aperture centers of 8 bolt holes on the connecting piece with the aperture centers of the reserved holes of the outer layer permanent template one by one;
step four: intercepting a bolt rod with a corresponding length, penetrating into the outer permanent template, penetrating into the connecting piece, penetrating out of the connecting piece and penetrating out of the permanent template;
step five: screwing two ends of the bolt rod by using bolt nuts;
step six: plugging and leveling the preformed hole of the outer layer permanent template by using cement mortar;
step seven: mixing plain concrete and pouring the plain concrete into the plain concrete;
step eight: maintaining the composite beam member;
the invention relates to a connecting piece, which is illustrated in the attached drawings: FIGS. 7-9 illustrate, from a top view of the continuous beam (showing the length and width sides of the beam), a top view of the continuous beam joint, and a top view of the connector, showing the location of the connector, the positional relationship of the various materials of the joint, and the dimensional relationship of the connector to the continuous beam, respectively; fig. 10 to 12 respectively describe, from the front view direction of the continuous beam (showing the length and height sides of the beam), a front view section of the continuous beam joint, a front view plane of the continuous beam joint, and a front view section of the connecting member, showing the positions of the connecting members, positional relationships of various materials of the joint, and dimensional relationships of the connecting members with the continuous beam;
the dimensions of the connector according to the invention are as follows: the length a of the connecting piece is valued according to the construction structure (a is 3 x distance +2x edge distance); the width b 'of the connecting piece is taken according to the width b of the beam (b' ═ b-2x high concrete template thickness-2 x square steel tube thickness); the height h 'of the connecting piece is taken according to the height h of the beam (h' is 2x square steel tube thickness-plain concrete protective layer thickness-high concrete template thickness).
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail; it should be understood that the above-mentioned embodiments are only illustrative of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a permanent template square steel tube combination beam of high performance concrete which characterized in that: the high-performance concrete permanent template square steel tube combination beam is composed of a high-performance concrete permanent template 1, a square steel tube 2 in the permanent template and plain concrete 3 filled inside, and in the high-performance concrete 1 in the permanent template, in order to save cost, broken stone aggregates are replaced by common washed river sand and 400-mesh heavy calcium carbonate; the permanent template consists of a high-performance concrete U-shaped template and a square steel pipe, the square steel pipe is embedded in the high-performance concrete U-shaped template and integrally cast with the U-shaped template during manufacturing, the thickness of the high-performance concrete template is 20mm, and the distance between the upper edge of a top plate of the square steel pipe and the upper edge of a side panel of the high-performance concrete U-shaped template is 20 mm; the invention uses the square steel tube to replace the common reinforcement cage, and the bottom plate of the square steel tube is a complete rectangular plate; rectangular holes are formed in the side panels of the square steel pipes at equal intervals, and the width of each hole is the same as the distance between the holes; square holes are formed in the top plate of the square steel pipe at equal intervals and in staggered arrangement with the side plate holes; plain concrete is filled in the composite beam.
2. A method for continuously connecting square steel pipes of a high-performance concrete permanent formwork in a combined mode is characterized by comprising the following steps: the connection structure of the combined continuous beam comprises: the concrete-reinforced concrete permanent formwork comprises a high-performance concrete permanent formwork 1, a square steel pipe 2 in the permanent formwork, plain concrete 3 filled inside, a square steel pipe type connecting piece 4, bolt holes 5, corresponding bolt holes 5' in a schematic diagram, and an outer layer permanent formwork preformed hole (a hole is formed in the inner square steel pipe and the outer high concrete) 6; the main method is a connecting method that a prefabricated connecting piece is embedded into square steel pipes at the end parts of two combined beams, a bolt rod penetrates through a plain concrete preformed hole and a connecting piece bolt hole, and then two ends of the bolt rod are screwed by a bolt nut; the connecting piece is prefabricated in a factory and is of a square steel tube type, and 8 bolt holes are respectively formed in four plate surfaces of the connecting piece at equal intervals; the 16 bolt rods are divided into two groups, each group comprises 8 bolt rods, and the length of each bolt rod is cut according to the height and the width of the combined beam; the diameter of the nut is matched with the diameter of the bolt rod.
3. A method for connecting a square steel pipe combined continuous beam of a high-performance concrete permanent template is characterized by comprising the following steps of: when the connecting piece of the high-performance concrete permanent template square steel pipe combined continuous beam is manufactured, 8 bolt holes are designed for each plate surface according to stress requirements.
4. A high-performance concrete permanent template square steel pipe composite beam and a manufacturing method thereof are characterized by comprising the following steps:
firstly, preparing high-performance concrete required in an outer permanent template of a composite beam, and carrying out experimental analysis on the compressive strength and the flexural strength of a high-performance concrete test piece to obtain the optimal mixing ratio; in the traditional preparation method, quartz sand and quartz powder are used, and in order to consider the cost, the quartz sand is replaced by water-washed river sand, and the quartz powder is replaced by 400-mesh heavy calcium carbonate powder; the properties of the replaced materials are similar to those of the raw materials, and the cost can be greatly reduced;
secondly, determining the size of the square steel pipe, and determining the height and the width of the square steel pipe according to the size of the composite beam;
thirdly, calculating the thickness of the square steel tube bottom plate (the square steel tube bottom plate equivalently replaces the bent steel bars) by designing the bending moment born by the combined beam;
fourthly, customizing a square steel pipe, and customizing the square steel pipe according to the height, the width and the thickness of the square steel pipe and the length of the beam;
fifthly, calculating the number of holes and the hole distance of the square steel tube web plate (the square steel tube web plate equivalently replaces sheared stirrups) by designing the shearing force born by the composite beam;
sixthly, drilling a hole on the top plate of the square steel pipe, and drilling holes at staggered positions of the top plate of the square steel pipe and the web plate according to the position of the hole on the web plate of the square steel pipe (so that the through effect of three-side holes is avoided and the mechanical property is not influenced);
seventhly, mixing the high-performance concrete, and mixing the high-performance concrete used in the mixing step by using a horizontal shaft forced mixer;
eighthly, supporting the outer template and the inner template of the bottom plate of the high-performance concrete permanent template, and pouring the bottom plate of the high-performance concrete permanent template
Ninth, adopting a high-frequency vibrator to fully and permanently build high-performance concrete on the template bottom plate;
tenth, removing the inner mold of the bottom plate after the bottom plate of the high concrete template is poured to reach certain strength, placing the square steel tube bottom plate on the bottom plate of the high concrete template in the middle, sealing the square steel tube web plate hole inside the steel tube by using a wood template, using the square steel tube web plate as an inner template of the side plate of the high concrete template, and pouring the side plate of the high concrete permanent template;
step eleven, adopting a high-frequency vibrator to fully heighten the high-performance concrete of the side panel of the permanent concrete template;
the twelfth step, the high-performance concrete template is maintained, and the permanent template is different from the ordinary plain concrete in properties and needs to be demolded and maintained in advance;
step ten, when the high concrete template reaches a certain strength, mixing plain concrete and pouring the plain concrete into the high concrete template;
and fourteenth, maintaining the composite beam member.
5. A method for continuously connecting square steel pipes of a high-performance concrete permanent template in a combined manner is characterized by comprising the following steps:
the first step, before pouring plain concrete into the interior, embedding the prefabricated connecting piece into the square steel tube of the left beam;
secondly, sleeving the square steel pipe of the right beam on the connecting piece;
thirdly, aligning the aperture centers of 8 bolt holes on the connecting piece with the aperture centers of the outer layer permanent template preformed holes of the left beam and the right beam one by one;
fourthly, intercepting a bolt rod with a corresponding length, penetrating into the outer permanent template, penetrating into the connecting piece, penetrating out of the connecting piece and penetrating out of the permanent template;
fifthly, screwing two ends of the bolt rod by using a bolt nut;
sixthly, plugging and leveling the preformed hole of the outer layer permanent template by using cement mortar;
seventhly, mixing plain concrete and pouring the plain concrete into the plain concrete;
and eighthly, maintaining the composite beam member.
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Cited By (1)
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