CN113216008A - Concrete pouring method for cantilever box girder - Google Patents
Concrete pouring method for cantilever box girder Download PDFInfo
- Publication number
- CN113216008A CN113216008A CN202110647117.9A CN202110647117A CN113216008A CN 113216008 A CN113216008 A CN 113216008A CN 202110647117 A CN202110647117 A CN 202110647117A CN 113216008 A CN113216008 A CN 113216008A
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- pouring
- box girder
- poured
- web
- way pump
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000010276 construction Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 238000005266 casting Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004540 pour-on Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of bridge engineering, in particular to a concrete pouring method for a cantilever box girder, which comprises the steps of pouring two ends of a three-way pump pipe simultaneously, reserving a discharge opening on a web plate, reserving a manhole on an end template, and adopting an attached vibrator at a chamfer angle; therefore, the concrete is more convenient to vibrate and pour, the process is simpler, the construction is more convenient, and the construction efficiency is further improved.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a cantilever box girder concrete pouring method.
Background
The construction of the bridge cantilever concrete cast-in-place box girder is an extremely important process in construction, and the symmetrical balanced pouring of two ends of a bridge is ensured in the pouring process, and the vibration uniformity, especially the positions of chamfers and webs in the box girder, is ensured in the pouring process, and if the vibration is not compact, cavities, honeycomb pitted surfaces and the like are easy to generate to influence the concrete quality.
The construction method of the prior common cantilever cast-in-place box girder comprises the following steps that firstly, the boundary of a pump pipe is cast by rotating the two sides of a bent pipe back and forth; secondly, the common mode of chamfering the positions of the bottom plate and the web plate is that a rod is downwards put from the top plate, and the concrete is compacted by adopting an iron hammer beating mode; thirdly, when the web concrete is poured, the web is provided with a construction hole, and the vibrating rod vibrates from top to bottom; the common methods can easily cause pipe blockage in the pouring process, and the concrete is not compact in vibration, over-vibration and leakage vibration; these are undesirable to those skilled in the art.
Disclosure of Invention
Based on the technical problems, the invention provides a cantilever box girder concrete pouring method, aiming at simplifying the construction difficulty, improving the construction efficiency and improving the quality of concrete.
A cantilever box girder concrete pouring method comprises the following steps:
step S1, pump pipe erection: laying a three-way pump pipe by taking a bridge pier body as a center, and horizontally extending two discharge pipes of the three-way pump pipe to the pouring surfaces of box girders to be poured, which are symmetrically arranged on two sides of a bridge deck;
step S2, pouring construction of the box girder bottom plate to be poured: pouring bottom plates of box girders to be poured on two sides of the bridge floor simultaneously by adopting the three-way pump pipes;
step S3, chamfering, pouring and vibrating: pouring bottom chamfers of box girders to be poured on two sides of the bridge floor by adopting the three-way pump pipes, and vibrating the bottom chamfers by adopting an attached vibrator outside a chamfer template after pouring is finished;
step S4, pouring construction of the box girder web plate to be poured: and respectively arranging discharge openings on templates at positions of web plates of box girders to be poured on two sides of the bridge deck, adopting the three-way pump pipe to pour the web plates of the box girders to be poured through the discharge openings, and pouring the web plates of the other side when the web plates of one side are vibrated.
Preferably, in the step S2, the bottom plates of the box girders to be cast on both sides of the bridge deck are cast in layers by adopting a "left-first-then-middle-then-right" distribution manner.
Preferably, after the bottom plate is poured and waits for 30-60 min, pouring construction of the chamfer angle is carried out.
Preferably, in the step S3, the chamfering template is a steel die, and the chamfering template and the box girder web to be poured are fixed by bolts.
Preferably, the chamfer template and the bottom plate of the box girder to be poured are fixed by welding steel bars.
Preferably, in the step S3, the vibrating time of the attachment vibrator is less than or equal to 60S.
Preferably, in step S4, a manhole is opened at the center of the web end formwork, and a worker enters the inside of the web through the manhole to vibrate.
Preferably, in the step S4, the height of the discharge opening from the bottom plate is less than or equal to 2 m.
Preferably, in the method, when the three-way pump pipe is used for pouring, and when the weight of concrete on two sides of the bridge floor is unbalanced, the three-way pump pipe is blocked by using a plug;
the plug comprises a joint and a steel plate welded on one side of the joint.
Preferably, the plug is fixed on the three-way pump pipe through a buckle.
The concrete vibrating and pouring method has the advantages of being more convenient to vibrate and pour, simpler in process, more convenient to construct and capable of improving construction efficiency.
Drawings
FIG. 1 is a flow chart of a cantilever box girder concrete pouring method in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a three-way pump pipe rack according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of the web end plate opening and attachment vibrator mounting in an embodiment of the present invention;
FIG. 4 is a cross-sectional view at AA in FIG. 3;
FIG. 5 is a schematic structural diagram of a plug in an embodiment of the invention;
FIG. 6 is a schematic view of a plug mounted on a pump tube in an embodiment of the present invention;
wherein, 1 is a three-way pump pipe; 2, casting surface; 3 is a bottom plate; 4 is a chamfer angle template; 5 is an attached vibrator; 6 is a discharge opening; 7 is an end manhole; 8 is a plug; and 9 is a buckle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 6, the invention discloses a cantilever box girder concrete pouring method, which specifically comprises the following steps:
step S1, pump pipe erection: lay tee bend pump line 1 with bridge pier shaft as center, just two discharging pipes of tee bend pump line 1 respectively the horizontal extension to the bridge floor bilateral symmetry set up wait to pour on the face 2 of pouring of case roof beam.
Step S2, pouring construction of the box girder bottom plate to be poured: and adopting a three-way pump pipe 1 to pour the bottom plates 3 of the box girders to be poured on the two sides of the bridge floor at the same time.
It should be noted that when the bridge bottom plate 3 is poured, the concrete slump should not be controlled to be about 180-190 excessively, preferably, a material distribution mode of 'left-first, middle-second and right-second' is adopted during pouring to carry out layered pouring on the bottom plates 3 of box girders to be poured on two sides of the bridge deck, and when the bottom plates 3 are poured, the concrete is stopped for about 30-60 min and then is shaped (the initial setting time of the concrete is not exceeded), and then the pouring construction of subsequent chamfer parts is carried out.
Step S3, chamfering, pouring and vibrating: adopt tee bend pump line 1 pours the bottom chamfer of the bridge floor both sides box girder of waiting to pour simultaneously to adopt attached vibrator 5 to vibrate in the chamfer template 4 outside after pouring the completion.
In a preferred embodiment of the present invention, the chamfering template 4 is made of a steel die, and the chamfering template 4 and the web of the box girder to be poured are fixed by bolts, so that the chamfering template 4 and the web can be stably connected.
In a preferred embodiment of the present invention, the chamfer template 4 and the box girder bottom plate 3 to be poured are fixed by welding with steel bars, so that the chamfer template 4 and the box girder bottom plate 3 to be poured can be stably connected.
In a preferred embodiment of the present invention, the vibrating time of the attached vibrator 5 is less than or equal to 60 s.
Step S4, pouring construction of the box girder web plate to be poured: discharge openings 6 are respectively formed in the templates at the positions, where the box girder webs are to be poured, of the two sides of the bridge deck, pouring construction is carried out on the webs of the box girder to be poured through the discharge openings 6 by adopting the three-way pump pipes 1, pouring is carried out on one layer of the webs every 30cm, and pouring of the webs on the other side is carried out when the webs on one side are vibrated.
Specifically, when concrete is poured to the discharge opening 6, the discharge opening 6 is welded and plugged by a steel plate.
In a preferred embodiment of the present invention, in step S4, a manhole 7 is opened at the center of a form at the end of a web, a worker enters the inside of the web through the manhole 7 to vibrate, specifically, concrete vibrates once every 30cm in thickness, the concrete needs to be inserted quickly and pulled slowly during vibration, the vibration time is controlled to be 20-30S, the concrete stops sinking, no air bubbles are generated, the surface shows floating slurry, the vibration of the upper and lower concrete layers is completed before the initial setting of the lower concrete layer, and the depth of the vibration rod inserted into the lower concrete layer is preferably 5-10cm, so as to ensure the concrete vibration of the web to be compact without over-vibration and leakage vibration.
In a preferred embodiment of the invention, the discharge opening 6 is less than or equal to 2m from the bottom plate 3, in particular, the discharge opening 6 is opened at the web 2m from the top surface of the bottom plate 3, so that the pump pipe extends into the web for distributing during casting and the concrete is ensured to fall freely by no more than 2 m.
In a preferred embodiment of the present invention, in the above method, when the weight of concrete on both sides of the bridge deck is unbalanced when the three-way pump pipe 1 is used for casting, the three-way pump pipe 1 is blocked by the plugs 8; the plug 8 comprises a joint and a steel plate welded on one side of the joint; and the choke plug 8 is fixed on the three-way pump pipe 1 through a buckle 9.
Specifically, two joints are cut out by using a waste pump pipe, the tail part of each joint is plugged by welding a steel plate to form a plug 8, the plug 8 is connected with the three-way pump pipe 1 and is fixed by a buckle 9, and when the plugs 8 of the pump pipe or the concrete volume on two sides is inconsistent, the plugs 8 can be used for single-side plugging until the three-way pump pipe 1 is smooth or the weight of two ends is balanced.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The cantilever box girder concrete pouring method is characterized by comprising the following steps of:
step S1, pump pipe erection: laying a three-way pump pipe by taking a bridge pier body as a center, and horizontally extending two discharge pipes of the three-way pump pipe to the pouring surfaces of box girders to be poured, which are symmetrically arranged on two sides of a bridge deck;
step S2, pouring construction of the box girder bottom plate to be poured: pouring bottom plates of box girders to be poured on two sides of the bridge floor simultaneously by adopting the three-way pump pipes;
step S3, chamfering, pouring and vibrating: pouring bottom chamfers of box girders to be poured on two sides of the bridge floor by adopting the three-way pump pipes, and vibrating the bottom chamfers by adopting an attached vibrator outside a chamfer template after pouring is finished;
step S4, pouring construction of the box girder web plate to be poured: and respectively arranging discharge openings on templates at positions of web plates of box girders to be poured on two sides of the bridge deck, adopting the three-way pump pipe to pour the web plates of the box girders to be poured through the discharge openings, and pouring the web plates of the other side when the web plates of one side are vibrated.
2. The cantilever box girder concrete casting method of claim 1, wherein in the step S2, the bottom plates of the box girder to be cast on both sides of the bridge deck are cast in layers by adopting a "left-first-middle-then-right" distribution manner.
3. The cantilever box girder concrete pouring method according to claim 1, wherein the pouring construction of the chamfered part is performed after the bottom plate pouring is completed and waiting for 30-60 min.
4. The cantilever box girder concrete casting method of claim 1, wherein in the step S3, the chamfering mold is a steel mold, and the chamfering mold and the box girder web to be cast are fixed by bolts.
5. The cantilever box girder concrete pouring method according to claim 4, wherein the chamfer formwork and the bottom plate of the box girder to be poured are fixed by welding steel bars.
6. The cantilever box girder concrete casting method of claim 1, wherein in the step S3, the vibrating time of the attachment vibrator is less than or equal to 60S.
7. The cantilever box girder concrete casting method of claim 1, wherein a manhole is opened at the center of the end formwork of the web, and a worker enters the inside of the web through the manhole to perform the vibration at step S4.
8. The cantilever box girder concrete casting method of claim 1, wherein the height of the discharge port from the bottom plate is less than or equal to 2m in the step S4.
9. The cantilever box girder concrete casting method according to claim 1,
in the method, when the three-way pump pipe is used for pouring, when the weight of concrete on two sides of a bridge floor is unbalanced, the three-way pump pipe is blocked by adopting a plug;
the plug comprises a joint and a steel plate welded on one side of the joint.
10. The cantilever box girder concrete casting method according to claim 1,
the plug is fixed on the three-way pump pipe through a buckle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647117.9A CN113216008A (en) | 2021-06-10 | 2021-06-10 | Concrete pouring method for cantilever box girder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110647117.9A CN113216008A (en) | 2021-06-10 | 2021-06-10 | Concrete pouring method for cantilever box girder |
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| Publication Number | Publication Date |
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| CN113216008A true CN113216008A (en) | 2021-08-06 |
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| CN202110647117.9A Pending CN113216008A (en) | 2021-06-10 | 2021-06-10 | Concrete pouring method for cantilever box girder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232493A (en) * | 2021-12-30 | 2022-03-25 | 中铁一局集团有限公司 | Pouring method for No. 0 block of prestressed concrete continuous beam |
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2021
- 2021-06-10 CN CN202110647117.9A patent/CN113216008A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114232493A (en) * | 2021-12-30 | 2022-03-25 | 中铁一局集团有限公司 | Pouring method for No. 0 block of prestressed concrete continuous beam |
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