CN111074754A - Construction method of fair-faced concrete for pier column and pier column - Google Patents
Construction method of fair-faced concrete for pier column and pier column Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000009415 formwork Methods 0.000 claims abstract description 12
- 238000005192 partition Methods 0.000 claims description 72
- 238000000034 method Methods 0.000 claims description 23
- 230000008569 process Effects 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims 2
- 238000009434 installation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 239000004575 stone Substances 0.000 description 10
- 238000003780 insertion Methods 0.000 description 8
- 230000037431 insertion Effects 0.000 description 8
- 238000005266 casting Methods 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
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- 230000009471 action Effects 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 230000007547 defect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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Abstract
本发明提供了一种墩柱清水混凝土施工方法及墩柱，属于墩柱施工领域。墩柱清水混凝土施工方法，包括：架设预埋钢筋，在墩柱的位置架设钢筋骨架；模板安装，在钢筋骨架的外周拼装模板形成模腔；混凝土浇筑，在模腔内同时浇筑第一混凝土和第二混凝土，第一混凝土浇筑于模腔靠近模板内壁的边缘部分，第二混凝土浇筑于模腔内部的中间部分，第一混凝土和第二混凝土分别为清水混凝土，且第一混凝土的水灰比大于第二混凝土的水灰比；混凝土振捣，分别对模腔内浇筑的第一混凝土和第二混凝土进行振捣；模板拆除，在模腔内的混凝土固化后拆除模板；混凝土养护。采用本发明墩柱清水混凝土施工方法制作的墩柱，强度更高，同时表面质量更好。
The invention provides a fair-faced concrete construction method for a pier column and a pier column, which belong to the field of pier column construction. The construction method of fair-faced concrete for pier columns includes: erecting pre-embedded steel bars and erecting steel bar frames at the positions of pier columns; formwork installation, assembling templates on the outer periphery of the steel bar frames to form a mold cavity; concrete pouring, pouring first concrete and The second concrete, the first concrete is poured on the edge part of the mold cavity close to the inner wall of the formwork, the second concrete is poured in the middle part of the mold cavity, the first concrete and the second concrete are respectively fair-faced concrete, and the water-cement ratio of the first concrete is Greater than the water-cement ratio of the second concrete; concrete vibrating, vibrating the first concrete and the second concrete poured in the mold cavity respectively; formwork removal, removing the formwork after the concrete in the mold cavity is solidified; concrete curing. The pier column made by the fair-faced concrete construction method of the pier column of the present invention has higher strength and better surface quality.
Description
Technical Field
The invention belongs to the technical field of pier stud construction, and particularly relates to a pier stud fair-faced concrete construction method and a pier stud.
Background
The bare concrete is the concrete which is formed by one-step pouring, does not have any external decoration and directly adopts the natural color of cast-in-place concrete as a decorative surface. The urban subway overhead pier has high requirement on the strength of the pier, the clear water concrete pier is manufactured by taking the strength and the surface quality into consideration, the traditional pier construction method is adopted for construction, the strength requirement of the pier can be guaranteed, but the surface of the pier is easy to have defects, and the surface requirement of the clear water concrete is difficult to achieve.
Disclosure of Invention
The invention aims to provide a pier stud fair-faced concrete construction method and a pier stud, and aims to solve the technical problem that although the strength requirement of the pier stud can be ensured by a traditional pier stud construction method in the prior art, the surface of the pier stud is difficult to meet the surface requirement of fair-faced concrete.
In order to achieve the purpose, the technical scheme adopted by the invention is to provide a pier stud fair-faced concrete construction method, which comprises the following steps:
erecting embedded steel bars, and erecting a steel bar framework at the position of the pier stud;
installing templates, namely assembling the templates on the periphery of the steel reinforcement framework to form a mold cavity;
pouring concrete, namely pouring first concrete and second concrete in the die cavity simultaneously, wherein the first concrete is poured on the edge part of the die cavity close to the inner wall of the template, the second concrete is poured on the middle part inside the die cavity, the first concrete and the second concrete are respectively fair-faced concrete, and the water cement ratio of the first concrete is greater than that of the second concrete;
vibrating the concrete, namely vibrating the first concrete and the second concrete poured in the die cavity respectively;
removing the template, namely removing the template after the concrete in the mold cavity is cured;
and (5) concrete curing.
As another embodiment of the present application, during said concrete casting, a partition plate is placed inside said mould cavity to divide said mould cavity into a middle portion and an annular edge portion;
removing said divider plate from the concrete poured in the mold cavity after said first concrete and said second concrete are poured and prior to said concrete being vibrated.
As another embodiment of the present application, the partition plate includes a first annular partition plate and a second annular partition plate, and an inscribed circle diameter of the first annular partition plate is smaller than an inscribed circle diameter of the second annular partition plate;
during said concrete casting, placing a divider plate within said mold cavity to divide said mold cavity into a central portion and an annular rim portion, comprising:
placing the first annular partition plate in the mold cavity, dividing the mold cavity into a middle part and an annular edge part, pouring first concrete on the edge part of the mold cavity, and pouring second concrete on the middle part of the mold cavity;
and taking the first annular partition plate out of the poured concrete, putting the second annular partition plate on the first concrete poured in the mold cavity, dividing the mold cavity into a middle part and an annular edge part, continuously pouring the first concrete on the edge part of the mold cavity, and continuously pouring the second concrete on the middle part of the mold cavity.
As another embodiment of the present application, in the concrete vibrating process, the second concrete in the mold cavity is vibrated first, and then the first concrete in the mold cavity is vibrated.
As another embodiment of the present application, when vibrating the second concrete in the mold cavity, a vibrating rod is vertically inserted from top to bottom to vibrate;
when the first concrete in the die cavity is vibrated, a vibrating rod is adopted to vibrate from top to bottom and from the first concrete to the second concrete in an inclined insertion mode.
As another embodiment of the present application, the partition plate includes a first annular partition plate and a second annular partition plate, and an inscribed circle diameter of the first annular partition plate is smaller than an inscribed circle diameter of the second annular partition plate;
during said concrete casting, placing a divider plate within said mold cavity to divide said mold cavity into a central portion and an annular rim portion, comprising:
placing the second annular partition plate in the mold cavity to divide the mold cavity into a middle part and an annular edge part, and then pouring first concrete on the edge part of the mold cavity and pouring second concrete on the middle part of the mold cavity;
and taking the second annular clapboard out of the poured concrete, putting the first annular clapboard on the second concrete poured in the mold cavity, continuously pouring the first concrete at the edge part of the mold cavity, and continuously pouring the second concrete at the middle part of the mold cavity.
As another embodiment of the present application, in the concrete vibrating process, the first concrete in the mold cavity is vibrated first, and then the second concrete in the mold cavity is vibrated.
As another embodiment of the present application, when vibrating the first concrete in the mold cavity, a vibrating rod is vertically inserted from top to bottom to vibrate;
when the second concrete in the die cavity is vibrated, a vibrating rod is adopted to vibrate from top to bottom and to insert the second concrete into the first concrete in an inclined manner.
As another embodiment of the present application, the first concrete and the second concrete are the same in the kinds and mixing ratios of cement, coarse aggregate, fine aggregate, admixture and admixture.
The pier stud fair-faced concrete construction method provided by the embodiment of the invention has the beneficial effects that: compared with the prior art, the pier stud fair-faced concrete construction method provided by the embodiment of the invention has the advantages that the first concrete with larger water cement ratio is poured at the edge part of the die cavity, so that the first concrete has stronger fluidity, and the first concrete can form a high-quality surface. And the water cement ratio of the second concrete is smaller, so that the strength of the pier is ensured.
The invention adopts another technical scheme that the pier column is manufactured by adopting any one of the pier column fair-faced concrete construction methods.
The pier column provided by the embodiment of the invention has the beneficial effects that: compared with the prior art, the pier stud of the embodiment of the invention has higher strength and better surface quality by adopting the method.
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 embodiments or the prior art descriptions will be briefly described 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 inventive exercise.
Fig. 1 is a flow chart of a pier stud fair-faced concrete construction method according to an embodiment of the invention;
FIG. 2 is a schematic construction structure diagram of the pier stud fair-faced concrete construction method provided by the embodiment of the invention;
FIG. 3 is a top view of FIG. 2;
fig. 4 is a schematic view of a construction structure constructed by using the pier stud fair-faced concrete construction method according to another embodiment of the present invention.
Wherein, in the figures, the respective reference numerals:
1-template; 2-a first annular partition; 3-first concrete; 4-second concrete; 5-second annular partition.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4 together, a method for constructing bare concrete for a pier stud according to an embodiment of the present invention will now be described. A pier stud fair-faced concrete construction method comprises the following steps:
s100, erecting embedded steel bars, and erecting a steel bar framework at the position of a pier stud;
step S200, installing a template 1, and assembling the template 1 on the periphery of the steel reinforcement framework to form a mold cavity;
step S300, pouring concrete, namely pouring first concrete 3 and second concrete 4 in the mold cavity at the same time, wherein the first concrete 3 is poured at the edge part of the mold cavity close to the inner wall of the template 1, the second concrete 4 is poured at the middle part inside the mold cavity, the first concrete 3 and the second concrete 4 are respectively fair-faced concrete, and the water cement ratio of the first concrete 3 is greater than that of the second concrete 4;
step S400, vibrating concrete, namely vibrating the first concrete 3 and the second concrete 4 poured in the die cavity respectively;
step S500, the template 1 is removed, and the template 1 is removed after the concrete in the cavity of the template is cured;
and S600, curing the concrete.
Compared with the prior art, the pier stud fair-faced concrete construction method provided by the embodiment of the invention has the advantages that the first concrete 3 with larger water cement ratio is poured at the edge part of the die cavity, so that the first concrete 3 has stronger fluidity, and the first concrete 3 can form a high-quality surface. And the water cement of the second concrete 4 is smaller, so that the strength of the pier is ensured.
In this embodiment, in the step S100 of erecting the embedded steel bars, the steel bars in the transverse direction and the longitudinal direction are bound into the steel bar framework according to the three-dimensional shape of the pier stud to be manufactured, and the steel bar framework cannot protrude out of the surface of the pier stud.
In the step S200 of installing the formwork 1, the formwork 1 must be pre-assembled, inspected, checked for acceptance, checked for joints, flatness, slab staggering, positioning pins, anchoring, etc., before being used in a construction site, so as to ensure the surface quality of the pier stud. The surface of the template 1 is brushed with template 1 paint as a release agent. After the template 1 is painted once, the template 1 can be poured and used for three times, and then the template 1 is needed to be painted again.
In the concrete casting in step S300, the first concrete 3 is selected from portland cement (portland cement having a compressive strength of 42.5 MPa) having a strength grade of P · O42.5 or more. The cement is preferably made by the same manufacturer, the same variety, the same batch and the same strength grade. The aggregate of the first concrete 3 is non-alkali active aggregate. The coarse aggregate has good continuous gradation, uniform and clean color, the mud content is less than 0.7 percent, the mud block content is less than 0.3 percent, and the needle-shaped particles are less than or equal to 10 percent. The fine aggregate is river sand with good continuous gradation, the fineness modulus is 2.3-2.9, the mud content is less than or equal to 1.0%, and the mud block content is less than or equal to 0.5%. Coarse and fine aggregates are required to be stored in separate bins, each batch of aggregates are detected, and the aggregates are put into the bins after meeting the requirements, so that special bin supply is realized, the aggregates are ensured to meet the requirements, and the color and luster are consistent. The admixture of the first concrete 3 is harmless to concrete and reinforcing steel bars, the mixture has good workability, and the admixtures used in the same project are from the same manufacturer and the same variety. The admixture selects I-grade fly ash, the mixing amount is determined through tests, and the quality and the application technology meet the current national standard and the regulations related to environmental protection. The commercial concrete station of the first concrete 3 needs to be provided with an independent cement tank for storage, and can only be used at the clear water concrete structure part, each batch of tank-entering cement is subjected to index detection before entering the tank, and the tank-entering cement is stored after meeting the requirements until the batch of cement is used up, and the cement is detected again, so that the stable quality of the cement in the construction process is ensured. The requirements of the second concrete 4 for cement, aggregate, admixtures may be the same as the first concrete 3.
The first concrete 3 can be prepared from 400kg/m3 of a cementing material, 0.41 of water-cement ratio, 16% of single-doped fly ash, 42% of sand content, 5-20 mm of broken stone continuous gradation and 10-20 mm of large stone: small stone (5-10 mm) ═ 3: 1, adopting a Subot polycarboxylic acid high-performance water reducing agent as an additive, designing slump (160 +/-20) mm, adjusting according to actual conditions during construction, selecting an optimal concrete mixing ratio, and pumping concrete.
The water-cement ratio of the second concrete 4 is slightly smaller than that of the first concrete 3, for example, the cement material is 400kg/m3, the water-cement ratio is 0.36, the single-doped fly ash is 16%, the sand content is 42%, the broken stone is 5-20 mm continuous gradation, and the large stone (10-20 mm): small stone (5-10 mm) ═ 3: 1, adopting a Subot polycarboxylic acid high-performance water reducing agent as an additive, designing slump (160 +/-20) mm, adjusting according to actual conditions during construction, selecting an optimal concrete mixing ratio, and pumping concrete. The water cement ratio of the first concrete 3 and the second concrete 4 is determined according to actual conditions, and the difference between the water cement ratio of the first concrete 3 and the water cement ratio of the second concrete 4 is not suitable to be too large.
Specifically, the first concrete cement: mineral powder: fly ash: large stones: small stones: sand: water: 280 parts of admixture: 60: 60: 782: 260: 754: 161: 3.2. and concrete cement in the second concrete: mineral powder: fly ash: large stones: small stones: sand: water: additive 314: 67: 67: 782: 260: 754: 161: 3.6.
in the concrete pouring of step S300, temperature measuring lines may be buried inside and on the surface of the first concrete 3 and the second concrete 4, and the temperature measuring lines are arranged at three different heights, i.e., upper, middle and lower. The ambient temperature and humidity were measured every 30min and a record was formed. And measuring the surface temperature of the concrete after the form is removed, wherein each surface is not less than 5 points. And measuring the concrete mold-entering temperature at not less than 10 points.
In the concrete vibrating step S400, the first concrete 3 and the second concrete 4 in the mold cavity may be vibrated in a conventional vibrating manner. The steps of dismantling the formwork 1 of the step S500 and curing the concrete of the step S600 may be the same as the conventional pier construction process.
Referring to fig. 2 to 4, as an embodiment of the method for constructing bare concrete for a pier stud according to the present invention, in the step S300 of pouring concrete, a partition plate is placed in a mold cavity to partition the mold cavity into a middle portion and an annular edge portion;
after the first concrete 3 and the second concrete 4 are cast and before the concrete is vibrated, the partition plate is taken out of the concrete cast in the mold cavity.
In this embodiment, the annular shape of the divider plate is similar to the cross-sectional profile of the pier, with dimensions less than the cross-sectional profile of the pier. For example, the cross-sectional profile of the pier is generally rectangular and the corresponding divider plate is generally rectangular and annular, the length of the divider plate being less than the length of the cross-sectional profile of the pier and the width of the divider plate being less than the width of the cross-sectional profile of the pier.
In this embodiment, the partition plate is placed in the mold cavity to divide the mold cavity into a middle portion and an annular edge portion, and the partition plate may be placed in the middle of the mold cavity so that the edge portion of the mold cavity is in an annular shape surrounding the periphery of the middle portion. When pouring, a plurality of concrete pumps can be adopted to respectively pour concrete to different positions of the edge part of the die cavity.
After the first concrete 3 and the second concrete 4 are poured and before the concrete is vibrated, the partition plate is taken out from the poured concrete in the mold cavity, so that the influence of the partition plate on vibration can be avoided.
Referring to fig. 2 and 3, as an embodiment of the method for constructing dry concrete for a pier stud according to the present invention, the partition plate includes a first annular partition plate 2 and a second annular partition plate 5, and the diameter of the inscribed circle of the first annular partition plate 2 is smaller than the diameter of the inscribed circle of the second annular partition plate 5.
In the concrete casting process of step S300, placing a partition plate in the mold cavity to divide the mold cavity into a middle portion and an annular edge portion, including:
placing a first annular clapboard 2 in a mold cavity, dividing the mold cavity into a middle part and an annular edge part, pouring first concrete 3 on the edge part of the mold cavity, and pouring second concrete 4 on the middle part of the mold cavity;
the first annular partition 2 is removed from the poured concrete, the second annular partition 5 is placed over the first concrete 3 poured in the mould cavity, the mould cavity is divided into a middle part and an annular edge part, the first concrete 3 continues to be poured in the edge part of the mould cavity, and the second concrete 4 continues to be poured in the middle part of the mould cavity.
In this embodiment, a plurality of partition plates having different inscribed circle diameters may be used, and the shape of each partition plate is the same.
The first annular partition plate 2 may be placed in the lower portion of the mold cavity to divide the mold cavity into an edge portion and a middle portion, and then the first concrete 3 and the second concrete 4 may be poured separately. After the lower part of the mold cavity is poured, the first annular partition plate 2 is taken out, then the second annular partition plate 5 is placed on the first concrete 3 poured in the mold cavity, the mold cavity is divided into an edge part and a middle part by the partition plate again, and then the first concrete 3 and the second concrete 4 are continuously poured on the poured concrete, so that the thickness of the first concrete 3 in the mold cavity is gradually increased from bottom to top, and the problem that the surface quality of the pier column is influenced because the second concrete 4 on the upper part of the mold cavity flows onto the inner wall of the mold plate 1 after the two partition plates are taken out is avoided to the greatest extent.
Referring to fig. 2 and 3, as a specific embodiment of the method for constructing bare concrete for a pier stud according to the present invention, in the step S400 of vibrating the concrete, the second concrete 4 in the mold cavity is vibrated first, and then the first concrete 3 in the mold cavity is vibrated. By the method, the second concrete 4 on the upper part of the die cavity can be prevented from flowing onto the inner wall of the die plate 1, and the surface quality of the pier stud is prevented from being influenced.
In the embodiment, the concrete is poured and tamped in layers, 12 high-frequency vibrating rods with the thickness of 50mm are adopted to sink to the bottom in advance, the vibrating operation of 'fast inserting and slow pulling' is unified, the distance between an inserting point and the inner wall of the formwork 1 is kept at 10cm, the distance between action points is 30-45 cm, the vibrating rods are lifted by about 30cm each time, the condition that the lower-layer concrete surface is not pulled by 10cm is suitable, the corresponding positions of the vibrating rods can be marked by significant objects such as double faced adhesive tapes in advance, and the vibrating time is about 25-35 s each time. The vibration time is controlled, and the points of the first concrete 3 towards the outside from the middle second concrete 4 are distributed. In order to facilitate the vibration of the concrete of the pier body, the reinforcing mesh at the top of the pier column can be placed when the concrete is poured to the position near the top of the pier column. The height of each pouring is not more than 30cm, the concrete is required to be vibrated uniformly, the leakage vibration and the over vibration are not required, the deep insertion and the light lifting are realized, the fast insertion and the slow pulling are realized, the vibration time is properly controlled, and more than 10cm of each layer needs to be inserted for connection.
Referring to fig. 2 and 3, as a specific embodiment of the method for constructing bare concrete for a pier stud according to the present invention, when vibrating the second concrete 4 in the mold cavity, a vibrating rod is vertically inserted from top to bottom to vibrate;
when the first concrete 3 in the die cavity is vibrated, the vibrating rod is adopted to vibrate from top to bottom and from the first concrete 3 to the oblique insertion of the second concrete 4. By adopting the method, the junction of the first concrete 3 and the second concrete 4 can form certain mixing, the overlarge difference between the two is avoided, the stress is generated, and the two are prevented from being separated.
In this embodiment, when the first concrete 3 in the mold cavity is vibrated, the included angle between the vibrating rod and the vertical direction is 5 degrees to 10 degrees.
Referring to fig. 4, as an embodiment of the method for constructing dry concrete for a pier stud according to the present invention, the partition plate includes a first annular partition plate 2 and a second annular partition plate 5, and the diameter of the inscribed circle of the first annular partition plate 2 is smaller than the diameter of the inscribed circle of the second annular partition plate 5.
In the concrete casting process of step S300, placing a partition plate in the mold cavity to divide the mold cavity into a middle portion and an annular edge portion, including:
placing a second annular clapboard 5 in the mold cavity to divide the mold cavity into a middle part and an annular edge part, then pouring first concrete 3 on the edge part of the mold cavity, and pouring second concrete 4 on the middle part of the mold cavity;
the second annular partition 5 is removed from the poured concrete, the first annular partition 2 is then placed over the second concrete 4 poured in the mould cavity, the first concrete 3 continues to be poured in the edge portion of the mould cavity and the second concrete 4 continues to be poured in the middle portion of the mould cavity.
In this embodiment, a plurality of partition plates having different inscribed circle diameters may be used, and the shape of each partition plate is the same.
It is possible to place a second annular partition 5 in the lower part of the mold cavity to divide the mold cavity into an edge part and a middle part and then to pour the first concrete 3 and the second concrete 4, respectively. After the lower part of the mold cavity is poured, the second annular partition plate 5 is taken out, the first annular partition plate 2 is placed on the first concrete 3 poured in the mold cavity, the mold cavity is divided into the edge part and the middle part by the partition plate again, and then the first concrete 3 and the second concrete 4 are continuously poured on the poured concrete, so that the thickness of the first concrete 3 in the mold cavity is gradually reduced from bottom to top, and the problem that the surface quality of the pier column is influenced because the second concrete 4 at the lower part of the mold cavity flows onto the inner wall of the mold plate 1 after the two partition plates are taken out is avoided to the greatest extent.
Referring to fig. 4, as a specific embodiment of the method for constructing bare concrete for a pier stud according to the present invention, in the step S400 of vibrating the concrete, the first concrete 3 in the mold cavity is vibrated first, and then the second concrete 4 in the mold cavity is vibrated. This kind of mode can avoid the second concrete 4 of die cavity lower part to flow on 1 inner wall of template, influence the surface quality of pier stud.
In this embodiment, in the concrete is poured and tamped in layers, 12 high-frequency vibrating rods with the diameter of 50mm are adopted to sink to the bottom in advance, the vibrating rods are uniformly 'quickly inserted and slowly pulled out', the distance between an insertion point and the inner wall of the formwork 1 is kept at 10cm, the distance between action points is 30-45 cm, the vibrating rods are lifted by about 30cm each time, preferably 10cm of the lower concrete surface is not pulled out, the concrete can be marked by significant objects such as double-sided adhesive tapes at corresponding positions of the vibrating rods in advance, and the vibrating time is about 25-35 s each time. The time of each vibration is controlled, and the points of the second concrete 4 facing the outside from the middle first concrete 3 are distributed. In order to facilitate the vibration of the concrete of the pier body, the reinforcing mesh at the top of the pier column can be placed when the concrete is poured to the position near the top of the pier column. The height of each pouring is not more than 30cm, the concrete is required to be vibrated uniformly, the leakage vibration and the over vibration are not required, the deep insertion and the light lifting are realized, the fast insertion and the slow pulling are realized, the vibration time is properly controlled, and more than 10cm of each layer needs to be inserted for connection.
Referring to fig. 4, as a specific embodiment of the method for constructing bare concrete for a pier stud according to the present invention, when vibrating the first concrete 3 in the mold cavity, a vibrating rod is vertically inserted from top to bottom to vibrate;
when the second concrete 4 in the die cavity is vibrated, the vibrating rod is adopted to vibrate from top to bottom and from the second concrete 4 to the oblique insertion of the first concrete 3. By adopting the method, the junction of the first concrete 3 and the second concrete 4 can form certain mixing, the overlarge difference between the two is avoided, the stress is generated, and the two are prevented from being separated.
In this embodiment, when the second concrete 4 in the mold cavity is vibrated, the included angle between the vibrating rod and the vertical direction is 5 degrees to 10 degrees.
Referring to fig. 2 to 4, as an embodiment of the method for constructing bare concrete for a pier stud according to the present invention, the first concrete 3 and the second concrete 4 have the same kind and mixing ratio of cement, coarse aggregate, fine aggregate, admixture, and admixture. The first concrete 3 and the second concrete 4 have basically the same components except different cement-water ratios, and the difference between the first concrete and the second concrete is not too large.
In this embodiment, the cement of the first concrete 3 and the cement of the second concrete 4 are products of the same manufacturer, the same variety, the same batch, and the same strength grade. The coarse aggregate and the fine aggregate adopted by the first concrete 3 and the second concrete 4 are the same, and the same product in the same production place is adopted.
The embodiment of the invention also provides the pier stud, which is manufactured by adopting any one of the pier stud fair-faced concrete construction methods.
Compared with the prior art, the pier stud of the embodiment of the invention has higher strength and better surface quality by adopting the method.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
Priority Applications (1)
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