CN112621984A - Construction process for reducing water wave phenomenon of prefabricated small box girder web - Google Patents
Construction process for reducing water wave phenomenon of prefabricated small box girder web Download PDFInfo
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- CN112621984A CN112621984A CN202011363003.3A CN202011363003A CN112621984A CN 112621984 A CN112621984 A CN 112621984A CN 202011363003 A CN202011363003 A CN 202011363003A CN 112621984 A CN112621984 A CN 112621984A
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- concrete
- vibration
- box girder
- steel bars
- reinforcing steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
Abstract
The invention discloses a construction process for reducing the water wave phenomenon of a prefabricated small box girder web plate, and relates to the technical field of box girder web plate construction processes; it comprises the following steps: the position of the horizontally distributed reinforcing steel bars is changed to increase the position space for the concrete to pass through and reduce the phenomenon of coarse aggregate accumulation; the particle size of the concrete graded broken stone is improved, and the control on the concrete raw material is increased; pouring concrete; vibrating; the method comprises the following steps of (1) removing a formwork, namely arranging horizontally distributed reinforcing steel bars on the inner sides of the annular reinforcing steel bars to increase the distance between the corrugated pipe and the reinforcing steel bars, increase the position space for concrete to pass through and reduce the accumulation phenomenon of coarse aggregates; and the phenomena of uneven vibration or vibration transition and the like are effectively improved by changing the vibration mode, and the problems of concrete compaction and web water marks are solved.
Description
Technical Field
The invention belongs to the technical field of box girder web plate construction processes, and particularly relates to a construction process for reducing the water wave phenomenon of a prefabricated small box girder web plate.
Background
With the rapid development of the construction industry and the improvement of the idea of creating the best in enterprises, the appearance quality of concrete is more and more emphasized. The demands placed on precast girders from the first place for safety, reliability and good durability have been increasing, and the demands for precast girders to have an elegant appearance have been further increasing. At present, the theory and practical experience of controlling the appearance quality of concrete are few, so the control of the appearance quality of concrete becomes a new problem to be solved urgently by engineering technicians.
Disclosure of Invention
Aiming at solving the problems of the defects and the shortcomings of the prior art; the invention aims to provide a construction process for reducing the water wave phenomenon of a prefabricated small box girder web, and the construction process can effectively solve the problems of concrete compactness and web water wave.
To achieve the above object, the present invention is characterized by comprising the steps of:
the method comprises the following steps: the position of the horizontally distributed reinforcing steel bars is changed to increase the position space for the concrete to pass through and reduce the phenomenon of coarse aggregate accumulation;
step two: the particle size of the concrete graded broken stone is improved, and the control on the concrete raw material is increased;
step three: pouring of concrete
Step four: vibrating;
step five: and (6) removing the mold.
Preferably, in the first step, the horizontally distributed reinforcing steel bars are arranged on the inner sides of the annular reinforcing steel bars, so that the distance between the corrugated pipe and the reinforcing steel bars is increased, the position space for passing concrete is increased, and the phenomenon of coarse aggregate accumulation is reduced;
preferably, the main raw materials for concrete construction in the step two are as follows:
cement: because the color of the cement poured finished product is related to the components of the cement mineral aggregate, the cement in the prefabricated box girder selects the common Portland cement with the green and uniform color, and the cement of the same variety and specification is ensured to be used in the same road section.
Sand; all adopt medium sand with good gradation, hard texture and clean particles, and the mud content is less than 1.0 percent.
Crushing stone; the processed coarse aggregate of granite, limestone and the like with the rock compressive strength meeting the requirements is adopted, the continuous gradation of the broken stone meets 5-25mm, and the crushing value is less than 7 percent.
Preferably, when the concrete of the box girder in the third step is poured, the bottom plate is poured firstly, the web plate and the top plate are poured later, the web plate is poured horizontally in layers, the pouring height of each layer is less than or equal to 50cm, the layer height is uniform, the longitudinal sectional pouring is carried out, and the material is distributed from the other end of the girder at a position 4-5 meters away from the girder end, so that the phenomenon that the strength of the girder body is uneven due to the fact that cement paste is gathered to the girder end is avoided.
Preferably, in the fourth step, concrete vibration is mainly carried out in a high-frequency attached mode, an inserted vibrating rod is used as an auxiliary mode, 5-15 attached vibrating devices are arranged on each side, the distance is 2-4 meters, the distance from the bottom plate is 50-80 centimeters high, the vibration of a vibrator is discontinuous, 20-30 seconds and 5 seconds are stopped for each vibration, each layer of concrete vibrates for 6-8 times, the position with dense reinforcing steel bars is subjected to a mode of blanking and vibrating, the inserted vibrating rod is inserted into the lower layer with the depth of 10-15cm, the vibrating time of each rod is controlled to be 3-5 seconds during vibration, and concrete is prevented from being separated; and secondary vibration is adopted, large bars are used at certain intervals, and then small bars are used for vibration compensation, the vibration intervals are uniform, the time is consistent, and the phenomena of segregation, leakage vibration, excessive vibration and the like of the concrete are avoided.
Preferably, in the fifth step, the form can be removed when the strength of the concrete reaches 2.5 MPa, the form removal time is 5 hours at 15-20 ℃ in summer, and the form removal time is 12 hours at 5-15 ℃ in winter.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the horizontally distributed reinforcing steel bars are arranged at the inner sides of the annular reinforcing steel bars, so that the distance between the corrugated pipe and the reinforcing steel bars is increased, the position space for passing concrete is increased, and the phenomenon of coarse aggregate accumulation is reduced; and the phenomena of uneven vibration or vibration transition and the like are effectively improved by changing the vibration mode, and the problems of concrete compaction and web water marks are solved.
Drawings
For ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is an outside view of the horizontal distribution ribs of the present invention;
fig. 2 is an inside view of the horizontal distribution rib of the present invention.
Wherein: the steel box comprises a box girder 1, annular steel bars 2 and horizontally distributed steel bars 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described below by way of specific embodiments. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the following embodiments, and other details not closely related to the present invention are omitted.
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Examples
When the horizontally distributed steel bars are arranged on the outer side (as shown in figure 1), the thickness of a web plate of the prefabricated small box girder (middle section) is 30cm, the net protective layer is 3cm, the diameters of the horizontal steel bars on the inner side and the outer side and the vertical steel bars are respectively 2.2cm, the diameter of the corrugated pipe is 5.5cm, and the exposed length of the horizontally distributed steel bars is 5cm, namely 30-2 x 3-2.2 x 2-5.5-2 x 5 is 4.1 cm. The calculation result shows that the distance between the corrugated pipe and the steel bar of the web plate (middle section) of the precast beam is about 2cm, a phi 30 vibrating rod is adopted on site, the vibrating rod cannot be inserted into a precast beam bottom plate, and meanwhile, 16-26.5mm of broken stone poured by concrete cannot even normally fall to the bottom plate, so that large stones are separated to the position above the corrugated pipe. The design of horizontally distributed reinforcing steel bars is changed on the inner side of the annular reinforcing steel bars (as shown in figure 2), when the thickness of a web plate of a prefabricated small box girder (middle section) is 30cm, and the net protective layer is 3cm, the diameters of the horizontal reinforcing steel bars and the vertical reinforcing steel bars on the inner side and the outer side are respectively 2.2cm, and the diameter of the corrugated pipe is 5.5cm, namely 30-2 multiplied by 3-2.2 multiplied by 2-5.5-14.1 cm. From the calculation results, the distance between the corrugated pipe of the prefabricated beam web plate (middle section) and the steel bar is about 7 cm. At the moment, cement, sand, gravel and additives meeting the quality requirements are mixed according to the mixing ratio, a bottom plate is poured firstly, a web plate and a top plate are poured secondly, the web plate is horizontally poured in layers, the pouring height of each layer is less than or equal to 50cm, the layer height is uniform, the materials are distributed from the other end of a beam at the position 4-5 meters away from the beam end, cement paste is prevented from being gathered to the beam end to cause the uneven strength of the beam body, then high-frequency attached vibration is adopted as a main mode, an inserted vibrating rod is adopted as an auxiliary mode, 5-15 attached vibration platforms are arranged at each side, the distance is 2-4 meters, the distance is 50-80 centimeters from the bottom plate, the vibration of a vibrator is intermittent, the vibration is stopped for 5 seconds every time after 20-30 seconds, then the vibration is carried out, each layer of concrete is vibrated for 6-8 times, the position where reinforcing steel bars are dense is subjected to the mode of simultaneous blanking and vibration, the inserted vibrating, controlling the vibration time of each rod to be 3-5s during vibration, and preventing the concrete from being separated; and secondary vibration is adopted, large bars are used at certain intervals, and then small bars are used for vibration compensation, the vibration intervals are uniform, the time is consistent, and the phenomena of segregation, leakage vibration, excessive vibration and the like of the concrete are avoided. When the strength of the concrete reaches 2.5 MPa, the form can be removed, the form removal time is 5 hours at 15-20 ℃ in summer, and the form removal time is 12 hours at 5-15 ℃ in winter.
According to the invention, the horizontally distributed reinforcing steel bars are arranged at the inner sides of the annular reinforcing steel bars, so that the distance between the corrugated pipe and the reinforcing steel bars is increased, the position space for passing concrete is increased, and the phenomenon of coarse aggregate accumulation is reduced; and the phenomena of uneven vibration or vibration transition and the like are effectively improved by changing the vibration mode, and the problems of concrete compaction and web water marks are solved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (6)
1. The construction process for reducing the water wave phenomenon of the prefabricated small box girder web is characterized by comprising the following steps of:
the method comprises the following steps: the position of the horizontally distributed reinforcing steel bars is changed to increase the position space for the concrete to pass through and reduce the phenomenon of coarse aggregate accumulation;
step two: the particle size of the concrete graded broken stone is improved, and the control on the concrete raw material is increased;
step three: pouring concrete;
step four: vibrating;
step five: and (6) removing the mold.
2. The construction process for reducing the water wave phenomenon of the prefabricated small box girder web plate according to claim 1, is characterized in that: in the first step, the horizontally distributed reinforcing steel bars are arranged on the inner sides of the annular reinforcing steel bars, so that the distance between the corrugated pipe and the reinforcing steel bars is increased, the position space where concrete passes is increased, and the phenomenon of coarse aggregate accumulation is reduced.
3. The construction process for reducing the water wave phenomenon of the prefabricated small box girder web plate according to claim 1, is characterized in that: the concrete construction in the second step requires the following main raw materials:
cement: because the color of the cement poured finished product is related to the components of the cement mineral aggregate, the cement in the prefabricated box girder selects the common Portland cement with the green and uniform color, and the cement of the same variety and specification is ensured to be used in the same road section.
Sand: all adopt medium sand with good gradation, hard texture and clean particles, and the mud content is less than 1.0 percent.
Crushing stone: the processed coarse aggregate of granite, limestone and the like with the rock compressive strength meeting the requirements is adopted, the continuous gradation of the broken stone meets 5-25mm, and the crushing value is less than 7 percent.
4. The construction process for reducing the water wave phenomenon of the prefabricated small box girder web plate according to claim 1, is characterized in that: and in the third step, when the concrete of the box girder is poured, the bottom plate is generally poured firstly, the web plate and the top plate are poured later, the web plate is horizontally poured in layers, the pouring height of each layer is less than or equal to 50cm, the layer height is uniform, the pouring is carried out in a longitudinal segmentation manner, and the material is distributed from the other end of the girder at a position 4-5 meters away from the girder end, so that the phenomenon that the strength of the girder body is uneven due to the fact that cement paste is gathered.
5. The construction process for reducing the water wave phenomenon of the prefabricated small box girder web plate according to claim 1, is characterized in that: in the fourth step, concrete vibration is mainly carried out in a high-frequency attached mode, an inserted vibrating rod is used as an auxiliary mode, 5-15 attached vibrating rods are arranged on each side, the distance is 2-4 meters, the distance from the bottom plate is 50-80 centimeters, the vibration of a vibrator is discontinuous, the vibration is carried out for 20-30 seconds each time, the vibration is stopped for 5 seconds, the vibration is carried out again, each layer of concrete vibrates for 6-8 times, the position with dense reinforcing steel bars adopts a mode of blanking and vibrating at the same time, the inserted vibrating rod is inserted into the depth of a lower layer for 10-15cm, the vibrating time of each rod is controlled to be 3-5s during vibration, and concrete segregation is prevented; and secondary vibration is adopted, large bars are used at certain intervals, and then small bars are used for vibration compensation, the vibration intervals are uniform, the time is consistent, and the phenomena of segregation, leakage vibration, excessive vibration and the like of the concrete are avoided.
6. The construction process for reducing the water wave phenomenon of the prefabricated small box girder web plate according to claim 1, is characterized in that: in the fifth step, the form can be removed when the strength of the concrete reaches 2.5 MPa, the form removal time is 5 hours at 15-20 ℃ in summer, and the form removal time is 12 hours at 5-15 ℃ in winter.
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| CN202011363003.3A CN112621984A (en) | 2020-11-27 | 2020-11-27 | Construction process for reducing water wave phenomenon of prefabricated small box girder web |
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| CN202011363003.3A CN112621984A (en) | 2020-11-27 | 2020-11-27 | Construction process for reducing water wave phenomenon of prefabricated small box girder web |
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| CN112621984A true CN112621984A (en) | 2021-04-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482351A (en) * | 2021-06-25 | 2021-10-08 | 中铁十九局集团有限公司 | Construction method for T-beam concrete pouring |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101310039B1 (en) * | 2013-05-07 | 2013-09-17 | 박영호 | Corrugated steel web box girder bridge, and continuous support structure thereof |
| CN105666687A (en) * | 2015-12-30 | 2016-06-15 | 中交一公局桥隧工程有限公司 | Construction process for pre-stress reactive powder concrete box girder |
| CN107882337A (en) * | 2017-11-27 | 2018-04-06 | 中铁二局集团有限公司 | It is limited for working space, the concrete in close packed structure region synthesis makes method firm by ramming |
-
2020
- 2020-11-27 CN CN202011363003.3A patent/CN112621984A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101310039B1 (en) * | 2013-05-07 | 2013-09-17 | 박영호 | Corrugated steel web box girder bridge, and continuous support structure thereof |
| CN105666687A (en) * | 2015-12-30 | 2016-06-15 | 中交一公局桥隧工程有限公司 | Construction process for pre-stress reactive powder concrete box girder |
| CN107882337A (en) * | 2017-11-27 | 2018-04-06 | 中铁二局集团有限公司 | It is limited for working space, the concrete in close packed structure region synthesis makes method firm by ramming |
Non-Patent Citations (4)
| Title |
|---|
| 一克拉的幸福6: "《浅析混凝土预制箱梁水波纹的形成原因及防治措施》", 23 March 2016, 个人图书馆 * |
| 付慧: "《高速铁路桥梁工程施工技术》", 30 August 2014, 中国铁道出版社 * |
| 孙云: "《隧道 桥梁 道路 水港 2011年学术交流会论文集》", 31 October 2011, 电子科技大学出版社 * |
| 江苏省交通厅: "《江苏省高速公路建设论文集 沂淮、淮江篇》", 31 December 2001, 人民交通出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113482351A (en) * | 2021-06-25 | 2021-10-08 | 中铁十九局集团有限公司 | Construction method for T-beam concrete pouring |
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Inventor after: Yu Meizu Inventor after: Shang Caixia Inventor after: Peng Lei Inventor after: Han Ao Inventor after: Han Kunpeng Inventor after: Wang Lien Inventor before: Yu Meizu Inventor before: Shang Caixia Inventor before: Peng Lei Inventor before: Han Ao Inventor before: Han Kunpeng Inventor before: Wang Lien |
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Application publication date: 20210409 |