CN111424883A - Prestressed cast-in-place clear water concrete inclined column structure and construction method thereof - Google Patents
Prestressed cast-in-place clear water concrete inclined column structure and construction method thereof Download PDFInfo
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- CN111424883A CN111424883A CN202010380844.9A CN202010380844A CN111424883A CN 111424883 A CN111424883 A CN 111424883A CN 202010380844 A CN202010380844 A CN 202010380844A CN 111424883 A CN111424883 A CN 111424883A
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- 239000004567 concrete Substances 0.000 title claims abstract description 126
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000010276 construction Methods 0.000 title claims abstract description 16
- 230000002787 reinforcement Effects 0.000 claims abstract description 86
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 83
- 239000010959 steel Substances 0.000 claims abstract description 83
- 210000002435 tendon Anatomy 0.000 claims abstract description 59
- 238000009434 installation Methods 0.000 claims abstract description 19
- 238000009415 formwork Methods 0.000 claims description 22
- 210000003205 muscle Anatomy 0.000 claims description 12
- 230000001154 acute effect Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 5
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- 239000011440 grout Substances 0.000 claims description 4
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- 230000009471 action Effects 0.000 claims description 2
- 238000010422 painting Methods 0.000 claims description 2
- 239000011150 reinforced concrete Substances 0.000 abstract description 7
- 239000010410 layer Substances 0.000 description 9
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
Abstract
The invention discloses a prestressed cast-in-place clear water concrete inclined column structure and a construction method thereof, wherein the structure comprises a concrete inclined column body, and the concrete inclined column body comprises a steel reinforcement framework and a concrete structure cast and formed along the steel reinforcement framework; the prestressed tendons are distributed on the inner side of the steel reinforcement framework and are longitudinally and uniformly distributed along two inclined side edges of the steel reinforcement framework, and each prestressed tendon is composed of a plurality of prestressed tendons; the column top embedded part comprises an installation part connected with the steel reinforcement framework, a top plate fixedly connected with the installation part and located at the top end of the concrete inclined column body, and a pouring hole and an air vent are formed in the top plate. The invention greatly improves the bearing capacity of the concrete batter post by adding the prestressed tendons, better exerts the performance of the concrete in the batter post and simultaneously reduces the steel consumption of the steel-reinforced concrete batter post.
Description
Technical Field
The invention relates to the technical field of cast-in-place concrete, in particular to a prestressed cast-in-place clear water concrete inclined column structure and a construction method thereof.
Background
With the continuous pursuit of building modeling in the building industry, concrete members with various special shapes are continuously emerged in building structures. The batter post is a common modeling component, and the appearance of a building and the appearance of the post are changed through different designs.
In the evolution of the design of the batter post and the building, the cross section size of the batter post is continuously reduced, which affects the bearing capacity of the batter post, but in the process of building arrangement, under the pursuit of a large-span space, the cross section size of the batter post as a building supporting member is difficult to balance the contradiction between modeling and stress calculation.
The large-scale venue adopts large-span space structure steel as the roof, and the independent structural column used for supporting the roof is a reinforced concrete batter post. Because the center of the inclined column deviates from the column top and the column foot, the inclined column cannot better exert the axle center stress of concrete due to the nature of the inclined column, and is difficult to bear larger load. At present, most building structures adopt the steel reinforced concrete inclined column to improve the bearing capacity of the steel reinforced concrete inclined column, but the steel reinforced concrete structures often find that the steel reinforced column core conflicts with the steel bar, the installation process is difficult, the installation quality is difficult to ensure, and the stress performance is finally influenced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a prestressed cast-in-place clear water concrete inclined column structure and a construction method thereof, and improves the bearing performance of concrete.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a cast-in-place clear water concrete batter post structure of prestressing force, includes:
the concrete inclined column body comprises a steel reinforcement framework and a concrete structure poured and formed along the steel reinforcement framework;
the prestressed tendons are distributed on the inner side of the steel reinforcement framework and are longitudinally and uniformly distributed along two inclined side edges of the steel reinforcement framework, and each prestressed tendon is composed of a plurality of prestressed tendons;
the column top embedded part comprises an installation part connected with the steel reinforcement framework and a top plate fixedly connected with the installation part and positioned at the top end of the concrete inclined column body, and a pouring hole and an air vent are formed in the top plate;
and a gap is formed between the bottom of the top plate and the top end of the concrete inclined column body, and the grouting layer is poured in the gap.
Optionally, the bottom of prestressing tendons for bury underground in stiff end in the concrete batter post substructure, the stiff end is the supporting first fixed part that is connected with respectively, first fixed part overlaps including from top to bottom establishing in proper order first spiral muscle, first pressure-bearing backing plate and the extrusion ground tackle on the prestressing tendons, the top of prestressing tendons restraints for set up in the tensioning end at concrete batter post top of the body post, tensioning end is supporting connection with second fixed part respectively, second fixed part includes by lower supreme establishing in proper order second spiral muscle, second pressure-bearing backing plate and the porous ground tackle on the prestressing tendons restraints, porous ground tackle bury underground in the grout layer.
Optionally, the number of the prestressed tendons of the concrete inclined column body is the same and the positions of the prestressed tendons are symmetrical, and the number of the prestressed tendons of each prestressed tendon at one side of the concrete inclined column body, which forms an acute angle with the ground, is less than the number of the prestressed tendons of each prestressed tendon at one side of the concrete inclined column body, which forms an obtuse angle with the ground.
And the construction method of the prestressed cast-in-place clear water concrete batter post comprises the following steps:
step one, embedding column base longitudinal reinforcements, prestressed reinforcements and fixed ends of the prestressed reinforcements when constructing a lower-layer structure of the concrete batter post;
secondly, installing a template and a template diagonal brace on one side of the concrete diagonal column, which forms an acute angle with the ground;
step three, mounting upper longitudinal reinforcements on the column base longitudinal reinforcements, binding the upper longitudinal reinforcements to form a reinforcement framework of the concrete inclined column, tensioning the prestressed reinforcements upwards and fixing the prestressed reinforcements on the reinforcement framework;
fourthly, mounting a column top embedded part at the top end of the steel reinforcement framework, wherein the column top embedded part comprises a top plate with a reserved gap formed between the bottom and the top end of the steel reinforcement framework;
fifthly, installing templates and template inclined struts on the rest sides of the concrete inclined column;
sixthly, pouring concrete in a formwork space formed by the four formworks;
step seven, when the concrete strength of the concrete batter post reaches a tensioning condition, mounting a prestressed anchorage device at the top end of the prestressed tendon for tensioning and cutting off the prestressed tendon section exposed at the upper end;
and step eight, pouring a grouting layer in a reserved gap between the bottom of the top plate of the column top embedded part and the top end of the steel reinforcement framework.
Optionally, in the step two and the step five, the following steps are respectively included:
a plurality of buttresses for installing the bottom of the formwork diagonal brace are installed on the ground;
cleaning the inner side surface of the template and painting a release agent;
installing the template;
adjusting the length of the template diagonal brace, and connecting and fixing the template and the top of the corresponding template diagonal brace;
and a connecting rod is arranged between the formwork diagonal braces at the same side.
Optionally, in the third step, the following steps are included:
the upper longitudinal rib is arranged at the upper end of the column base longitudinal rib;
erecting an operation frame along the periphery of the concrete batter post;
installing a positioning steel pipe at the corresponding elevation position of each row of upper longitudinal ribs on the operating frame;
adjusting the mounting position of the upper longitudinal rib under the auxiliary positioning action of the positioning steel pipe;
sleeving the stirrups from the upper ends of the upper longitudinal bars, and binding the upper longitudinal bars from bottom to top in sequence to form the reinforcement cage;
and tensioning the prestressed tendons upwards, installing a pressure-bearing base plate at the top end of the steel reinforcement framework where the prestressed tendons are located, and binding and fixing the prestressed tendons and the steel reinforcement framework.
Optionally, a plurality of discharging ports located at different heights are arranged on the template, and in the sixth step, the method includes the following steps:
pouring cement mortar on outer rings of the bottoms of the four templates;
inserting a corrugated pipe with a vibrating rod arranged inside into the steel bar framework, and lifting the corrugated pipe while lifting the vibrating rod;
the corrugated pipe is used as a string cylinder and concrete is poured into the template space from bottom to top through the plurality of discharge ports in sequence;
and when the concrete is poured to the height of the discharge hole, the discharge hole is blocked until the concrete is poured to the top end of the steel pipe framework.
Optionally, after the sixth step is performed, when the strength of the concrete meets the requirement of form removal, the form except for the form on the side forming an acute angle with the ground is removed, the concrete batter post is maintained, the seventh step and the eighth step are performed, and finally the form on the remaining side is removed.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1. the concrete batter post greatly improves the bearing capacity by adding the prestressed tendons, better exerts the performance of concrete in the batter post, and simultaneously reduces the steel consumption of the relative steel reinforced concrete batter post.
2. The construction method of the invention adopts a reasonable support system and is simple to operate.
3. Under the condition that reinforcing bars in the concrete batter post are dense and the construction content is large, the reinforcing bars can be accurately positioned, the installation of all components in the concrete batter post and the smooth implementation of concrete pouring are ensured, the good appearance and quality of the batter post are ensured, and the effect of fair-faced concrete is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic top view structure of a prestressed cast-in-place clear water concrete batter post structure according to an embodiment of the present invention.
Fig. 2 shows a schematic front structural view of a prestressed cast-in-place clear water concrete batter post structure according to an embodiment of the present invention.
Fig. 3 shows a schematic structural diagram of a first implementation step of the embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of a fourth implementation step of the embodiment of the present invention.
Fig. 5 is a schematic front structural diagram illustrating a fifth implementation step of the embodiment of the present invention.
Fig. 6 is a schematic side view of a fifth step of the embodiment of the present invention.
Fig. 7 is a schematic top view of the fifth step of the embodiment of the present invention.
FIG. 8 is a schematic top view of a retaining stirrup in an embodiment of the invention.
Fig. 9 is a schematic perspective view showing a dustpan hopper according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
The invention is described in further detail below with reference to the figures and specific embodiments.
As shown in fig. 1-2, the prestressed cast-in-place clear water concrete inclined column structure of the embodiment of the present invention includes a concrete inclined column body 1, prestressed tendons 3, a column top embedded part 4, and a grouting layer 5, wherein:
the concrete inclined column body 1 comprises a steel reinforcement framework 2 and a concrete structure cast along the steel reinforcement framework 2; the plurality of prestressed tendons 3 are distributed on the inner side of the steel reinforcement framework 2 and are longitudinally and uniformly distributed along two inclined side edges of the steel reinforcement framework 2, and the plurality of prestressed tendons 3 are respectively composed of a plurality of prestressed tendons 31; the column top embedded part 4 comprises an installation part connected with the steel reinforcement framework 2 and a top plate which is fixedly connected with the installation part and is positioned at the top end of the concrete inclined column body 1, and a pouring hole 41 and a vent hole 42 are formed in the top plate; and a grouting layer 5 is poured in a gap formed by the bottom of the top plate and the top end of the concrete inclined column body 1.
The concrete batter post greatly improves the bearing capacity by adding the prestressed tendons, better exerts the performance of concrete in the batter post, and simultaneously reduces the steel consumption of the relative steel reinforced concrete batter post.
In this embodiment, the steel reinforcement framework 2 is built according to the shape of the concrete batter post to be poured, so that the concrete batter post body 1 can be shaped according to the appearance of the concrete batter post to be poured. The steel reinforcement framework 2 is mainly a cage body formed by longitudinal bars 21 and stirrups 22, the longitudinal bars 21 are uniformly arranged along the side line of the concrete inclined column body 1, and a steel reinforcement protective layer with the thickness not less than 3cm is formed on the outer surface of a poured concrete structure and the side edge of the steel reinforcement framework 2. The closed stirrups are arranged along the outer sides of the longitudinal reinforcements 21, and the rest stirrups 22 are required to be arranged according to the shape of the cross section of the concrete batter post.
In this embodiment, the tendon 31 is a slowly bonded tendon 31, and the process is simple, the installation and arrangement are flexible, and the bonding performance is good under the condition that the longitudinal bar 21 and the stirrup 22 are very dense. The prestressed reinforcement bundles 3 are respectively composed of a plurality of prestressed reinforcements 31, the bottom ends of the prestressed reinforcements 31 are fixed ends embedded in the lower layer structure of the concrete inclined column body 1, the fixed ends are respectively and cooperatively connected with first fixing parts, the first fixing parts comprise first spiral reinforcements, first pressure-bearing base plates and extrusion anchors (not shown) which are sequentially sleeved on the prestressed reinforcements 31 from top to bottom, the top ends of the prestressed reinforcement bundles 3 are tensioning ends arranged at the top of the concrete inclined column body 1, the tensioning ends are respectively and cooperatively connected with second fixing parts, the second fixing parts comprise second spiral reinforcements 33, second pressure-bearing base plates 32 and porous anchors which are sequentially sleeved on the prestressed reinforcement bundles 3 from bottom to top, and the porous anchors are embedded in the grouting layer 5. And the prestressed tendons 3 arranged at the two sides of the concrete oblique cylinder 1 are the same in number and symmetrical in position, as shown in fig. 1, the number of the prestressed tendons 31 of each prestressed tendon 3 at one side of the concrete oblique cylinder 1 forming an acute angle with the ground is less than the number of the prestressed tendons 31 of each prestressed tendon 3 at one side of the concrete oblique cylinder 1 forming an obtuse angle with the ground.
In this embodiment, the top end of the inclined concrete column 1 is provided with a column top embedded part 4, the column top embedded part 4 is equivalent to a measure steel bar for connecting an upper-end external steel structure bottom support, and the column top embedded part 4 is provided with a plurality of pouring holes 41 and air holes 42 for pouring the concrete structure of the inclined concrete column 1. The reserved clearance between the roof of piece 4 is buried to the capital and the batter post concrete top is about 50mm, and grout blanket 5 does not have shrink grout material for the high strength and seals this reserved clearance and form for when the clearance is reserved between the closely knit capital piece 4 and the concrete, still fill the anchor sealing recess that 1 top of concrete batter post is used for prestressing force muscle bundle 3.
Based on the embodiment of the prestressed cast-in-place clear water concrete batter post structure, the embodiment of the construction method of the prestressed cast-in-place clear water concrete batter post is further introduced, and the construction method comprises the following steps:
step S1, as shown in fig. 3, the column base longitudinal rib 211, the prestressed rib 31 and the fixed end of the prestressed rib 31 are embedded when constructing the lower structure of the concrete batter post, the column base longitudinal rib 211 and the lower structure column are mechanically connected, and the straight thread connection is used to install in a positive and negative thread manner, so that the problem of installation failure is avoided. The fixed end of the tendon 31 is connected with a first fixing component embedded in the lower mechanism, and the first fixing component comprises a first spiral tendon, a first pressure bearing backing plate and an extrusion anchor (not shown) which are sequentially sleeved on the tendon 31 from top to bottom. Wherein the embedded depth of the tendon 31 is not less than 1.5 m.
Since the angle of each column base longitudinal rib 211 is not uniform, the column base longitudinal rib 211 needs to be positioned by the positioning stirrup 23. The post foot is indulged muscle 211 and is being measured and confirm the mounted position after, indulge a plurality of location stirrup 23 of ligature in order to reach the rigidity on the muscle 211 at the post foot, and electric welding welded fastening, location stirrup 23 adopts the reinforcing bar more than diameter 16, suitably carry out the segmentation to location stirrup 23 with reinforcing bar quantity according to the shape in post cross-section, and indulge the vertical every interval 1m left and right sides ligature outer hoop formula location stirrup 23 of muscle 211 along the post foot, thereby it is accurate to indulge the mounted position of muscle 211 with guaranteeing every post foot, location stirrup 23 structure is as shown in figure 8.
Before the implementation of the step S1, computer software is used for carrying out auxiliary lofting on the structure of the concrete batter post, the space requirements of all parts (including embedded parts, reinforcing steel bars, prestressed ribs 31 and anchors thereof) in a dense space in the batter post are determined, and construction materials (longitudinal reinforcing steel bars, binding reinforcing steel bars, prestressed ribs, batter post forming templates, diagonal braces, buttresses and the like) are processed, wherein the longitudinal reinforcing steel bars 21 are bent and sectionally processed and sheathed according to the angles of the reinforcing steel bars, the longitudinal reinforcing steel bars are classified and stacked, each reinforcing steel bar is correspondingly numbered according to the installation position of the reinforcing steel bar, the length of each prestressed rib 31 is properly prolonged according to the bottom embedded length and the top length, the length of each prestressed rib 31 is properly considered, the batter post templates adopt a customized steel mold, steel plates are adopted for steel mold panels, small-specification channel steel is adopted for secondary ridges 72, the longitudinal arrangement is adopted, as shown in figure 5, a main ridge 71 adopts a double-spliced channel steel plate horizontal arrangement, reinforcing screws are adopted between the segments, the longitudinal flange connection is adopted, a phi is adopted for connecting the top lofting template, a plurality of the oblique posts is arranged at a plurality of small-specification channel steel plates 72, a plurality of oblique posts, the oblique posts are connected with a supporting rod piece, a supporting rod piece is connected with a supporting rod piece through a telescopic screw 82, a screw 82, the supporting rod piece 60, the supporting rod piece is connected with a bracket 60, the bracket 60 is connected with a bracket 60, the bracket 60 is connected with the bracket 60, the bracket 60 is connected with the bracket.
Step S2, installing the formwork and the formwork diagonal brace 61 on the side where the concrete diagonal brace and the ground form an acute angle, as shown in fig. 5 and 7, specifically including:
s201, installing a plurality of buttresses 63 for installing the bottom of the formwork diagonal brace 61 on the ground, wherein the installation positions of the buttresses 63 need to correspond to the length of the diagonal brace 61, so that the included angle between the diagonal brace 61 and the horizontal plane is not less than 60 degrees;
s202, cleaning the inner side surface of the template and coating a release agent;
s203, installing a template;
s204, adjusting the length of the template inclined strut 61 by rotating the screw 64 so as to adjust the inclination angle required for connecting the template, and connecting and fixing the bracket 65 on the template and the top of the corresponding template inclined strut 61;
s205, transversely arranged connecting rods 62 are installed between the formwork inclined struts 61 on the same side, and the installation interval of the connecting rods 62 is about 1.5 m.
Step S3, on column base indulges muscle 211, install upper portion and indulge the muscle and carry out stirrup 22 ligature formation concrete batter post' S framework of steel reinforcement 2 to upper portion indulges the muscle, upwards take up prestressing tendons 31 simultaneously and be fixed in on framework of steel reinforcement 2 with prestressing tendons 31, specifically include:
s301, according to the number of each longitudinal bar 21 steel bar during the construction material processing, an upper longitudinal bar is arranged at the upper end of the column base longitudinal bar 211 and connected through a straight thread sleeve joint, the joint percentage is not more than 50%, and if the processing forming cannot meet the joint percentage requirement, a first-level joint can be adopted.
And S302, erecting a steel pipe operating frame along the periphery of the concrete batter post.
And S303, installing a positioning steel pipe at the position of the steel pipe operation frame corresponding to the elevation corresponding to each row of upper longitudinal ribs.
S304, under the auxiliary positioning effect of the positioning steel pipe, the upper longitudinal bars are accurately adjusted to the designed installation position by using tools such as cloth belts and the like.
S305, the stirrups 22 are sleeved from the upper ends of the upper longitudinal bars to sequentially bind the upper longitudinal bars from bottom to top to form a steel reinforcement framework 2, and steel reinforcement protective layer cushion blocks are bound at intervals of 1m around the stirrups 22 of the cage body of the steel reinforcement framework 2.
S306, upwards strain prestressing tendons 31 and lie in 2 tops of framework of steel reinforcement department installation pressure-bearing backing plate 32 at prestressing tendons 31 to carry out the ligature with prestressing tendons 31 and framework of steel reinforcement 2 fixedly, every 1m is left and right fixed with prestressing tendons 31 at the top to the middle part on the vertical direction of framework of steel reinforcement 2, and the mode of forbidding to adopt the electric welding is fixed.
Step S4, installing the column top embedded part 4 at the top end of the steel reinforcement framework 2, as shown in fig. 4, the column top embedded part 4 includes an installation part for installing with the steel reinforcement firmware and a top plate fixedly arranged at the upper end of the installation part, wherein a reserved gap is arranged between the bottom of the top plate and the top end of the steel reinforcement framework 2, and two pouring holes 41 and two vent holes 42 are reserved on the column top embedded part 4, so as to smoothly pour the concrete and grouting material at the later stage.
Before the column top embedded part 4 is installed, the bent anchor section of the upper longitudinal reinforcement column top should avoid the space of the column top embedded part 4, if avoiding measures cannot be taken, the bent anchor section steel bar of the part which conflicts with the column top embedded part 4 is cut off, and after the column top embedded part 4 is installed and fixed, a steel bar net with the same specification as the binding is laterally inserted into the elevation position of the upper longitudinal reinforcement bent anchor section for reinforcement.
Step S5, installing the remaining formwork and formwork diagonal brace 61 on each side of the concrete diagonal column, as shown in fig. 5, 6 and 7, the specific steps are the same as those of S201 to S205, which are not described herein again. And vibrators 9 are installed and fixed to the outer surfaces of the bottom and middle portions in the vertical direction of the formwork.
Step S6, pouring concrete in the formwork space formed by the four-side formworks, and the concrete pouring method specifically comprises the following steps:
s601, pouring cement mortar on the outer rings of the bottoms of the four-side formworks, wherein the pouring height is at least 5cm, so that bottom slurry leakage is prevented when concrete is poured subsequently.
S602, inserting a soft corrugated pipe with the diameter of 100mm into the steel reinforcement framework 2 before concrete pouring, forming a groove with the width of 70mm on the surface of the corrugated pipe, placing a vibrating rod with the width of 50mm into the groove, and keeping the vibrating rod in the corrugated pipe along with lifting. Meanwhile, the corrugated pipe is used as a string cylinder during pouring, and base mortar and bottom concrete are conveyed downwards.
S603, pouring concrete into the space of the template sequentially through a plurality of discharge ports 82 formed in the template from bottom to top, wherein the concrete is self-compacting concrete, the slump of the concrete is 210-230 mm, and the expansion degree of the concrete is 370-450 mm.
And S604, when the concrete is poured to the height of the discharge hole 82, blocking the discharge hole 82 at the height until the top end of the steel pipe framework is poured, and when the top end is poured, pouring is carried out through the pouring hole 41 in the column top embedded part 4.
When the strength of the concrete structure reaches the strength required by form removal, the form boards except the form board on the side forming an acute angle with the ground are removed, and the concrete surface is sprayed with water and then wrapped by a covering film for about two weeks.
And step S7, when the concrete strength of the concrete batter post reaches a tensioning condition, installing a prestressed anchorage device at the top end of the prestressed tendon 31 and tensioning, and after tensioning is finished, cutting off the exposed prestressed tendon 31 by a mechanical method.
And S8, installing a hanging mould in a reserved gap between the bottom of a top plate of the column top embedded part 4 and the top end of the steel reinforcement framework 2, and pouring a grouting layer 5 in a hanging mould space, wherein the hanging mould can be made of a customized steel mould or a common wood mould, and nails driven into the surface of the inclined column concrete at the bottom of the hanging mould can be used as temporary supporting.
And finally, removing the templates on the rest side to finish construction.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The utility model provides a cast-in-place clear water concrete batter post structure of prestressing force which characterized in that includes:
the concrete inclined column body comprises a steel reinforcement framework and a concrete structure poured and formed along the steel reinforcement framework;
the prestressed tendons are distributed on the inner side of the steel reinforcement framework and are longitudinally and uniformly distributed along two inclined side edges of the steel reinforcement framework, and each prestressed tendon is composed of a plurality of prestressed tendons;
the column top embedded part comprises an installation part connected with the steel reinforcement framework and a top plate fixedly connected with the installation part and positioned at the top end of the concrete inclined column body, and a pouring hole and an air vent are formed in the top plate;
and a gap is formed between the bottom of the top plate and the top end of the concrete inclined column body, and the grouting layer is poured in the gap.
2. The prestressed cast-in-place clear water concrete batter post structure of claim 1, characterized in that: the bottom of prestressing tendons for bury underground in the stiff end in the concrete batter post substructure, the stiff end is the supporting first fixed part that is connected with respectively, first fixed part overlaps including from top to bottom establishing in proper order first spiral muscle, first pressure-bearing backing plate and the extrusion ground tackle on the prestressing tendons, the top of prestressing tendons restraints is for setting up in the tensioning end at concrete batter post top of the body post, tensioning end is supporting connection with second fixed part respectively, the second fixed part includes by lower supreme establishing in proper order second spiral muscle, second pressure-bearing backing plate and porous ground tackle on the prestressing tendons restraints, porous ground tackle bury underground in the grout layer.
3. The prestressed cast-in-place clear water concrete batter post structure of claim 1, characterized in that: the prestressed reinforcement bundles are arranged on two sides of the concrete inclined cylinder body, the number of the prestressed reinforcement bundles is the same, the positions of the prestressed reinforcement bundles are symmetrical, and the number of the prestressed reinforcement bundles on one side of the concrete inclined cylinder body, which forms an acute angle with the ground, is less than that of the prestressed reinforcement bundles on one side of the concrete inclined cylinder body, which forms an obtuse angle with the ground.
4. A construction method of a prestressed cast-in-place clear water concrete batter post is characterized by comprising the following steps:
step one, embedding column base longitudinal reinforcements, prestressed reinforcements and fixed ends of the prestressed reinforcements when constructing a lower-layer structure of the concrete batter post;
secondly, installing a template and a template diagonal brace on one side of the concrete diagonal column, which forms an acute angle with the ground;
step three, mounting upper longitudinal reinforcements on the column base longitudinal reinforcements, binding the upper longitudinal reinforcements to form a reinforcement framework of the concrete inclined column, tensioning the prestressed reinforcements upwards and fixing the prestressed reinforcements on the reinforcement framework;
fourthly, mounting a column top embedded part at the top end of the steel reinforcement framework, wherein the column top embedded part comprises a top plate with a reserved gap formed between the bottom and the top end of the steel reinforcement framework;
fifthly, installing templates and template inclined struts on the rest sides of the concrete inclined column;
sixthly, pouring concrete in a formwork space formed by the four formworks;
step seven, when the concrete strength of the concrete batter post reaches a tensioning condition, mounting a prestressed anchorage device at the top end of the prestressed tendon for tensioning and cutting off the prestressed tendon section exposed at the upper end;
and step eight, pouring a grouting layer in a reserved gap between the bottom of the top plate of the column top embedded part and the top end of the steel reinforcement framework.
5. The construction method of the prestressed cast-in-place clear water concrete batter post as claimed in claim 4, characterized in that in the second step and the fifth step, respectively, the following steps are included:
a plurality of buttresses for installing the bottom of the formwork diagonal brace are installed on the ground;
cleaning the inner side surface of the template and painting a release agent;
installing the template;
adjusting the length of the template diagonal brace, and connecting and fixing the template and the top of the corresponding template diagonal brace;
and a connecting rod is arranged between the formwork diagonal braces at the same side.
6. The construction method of the prestressed cast-in-place clear water concrete batter post as claimed in claim 4, characterized in that in the third step, the following steps are included:
the upper longitudinal rib is arranged at the upper end of the column base longitudinal rib;
erecting an operation frame along the periphery of the concrete batter post;
installing a positioning steel pipe at the corresponding elevation position of each row of upper longitudinal ribs on the operating frame;
adjusting the mounting position of the upper longitudinal rib under the auxiliary positioning action of the positioning steel pipe;
sleeving the stirrups from the upper ends of the upper longitudinal bars, and binding the upper longitudinal bars from bottom to top in sequence to form the reinforcement cage;
and tensioning the prestressed tendons upwards, installing a pressure-bearing base plate at the top end of the steel reinforcement framework where the prestressed tendons are located, and binding and fixing the prestressed tendons and the steel reinforcement framework.
7. The construction method of the prestressed cast-in-place clear water concrete batter post according to claim 4, characterized in that a plurality of discharge ports located at different heights are provided on the formwork, and in the sixth step, the method comprises the following steps:
pouring cement mortar on outer rings of the bottoms of the four templates;
inserting a corrugated pipe with a vibrating rod arranged inside into the steel bar framework, and lifting the corrugated pipe while lifting the vibrating rod;
the corrugated pipe is used as a string cylinder and concrete is poured into the template space from bottom to top through the plurality of discharge ports in sequence;
and when the concrete is poured to the height of the discharge hole, the discharge hole is blocked until the concrete is poured to the top end of the steel pipe framework.
8. The construction method of the prestressed cast-in-place clear water concrete batter post as claimed in claim 4, characterized in that: after the sixth step is carried out, when the strength of the concrete meets the requirement of form removal, the formworks except the formwork on the side forming an acute angle with the ground are removed, the concrete batter post is maintained, the seventh step and the eighth step are carried out, and finally the formwork on the rest side is removed.
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