CN103306207A - Method for controlling emptiness sound of bearing plate of prestressed post-tensioned box beam - Google Patents
Method for controlling emptiness sound of bearing plate of prestressed post-tensioned box beam Download PDFInfo
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- CN103306207A CN103306207A CN2013102411314A CN201310241131A CN103306207A CN 103306207 A CN103306207 A CN 103306207A CN 2013102411314 A CN2013102411314 A CN 2013102411314A CN 201310241131 A CN201310241131 A CN 201310241131A CN 103306207 A CN103306207 A CN 103306207A
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Abstract
The invention belongs to the technical field of prefabrication of simply-supported railway beams, and in order to solve the problem that a bearing plate has an emptiness sound because of dense steel bars at the bearing plate, poor passability and difficult ramming of concrete, and the like during the prefabrication of a simply-supported railway beam, provides a method for controlling the emptiness sound of the bearing plate of a prestressed post-tensioned box beam. The method comprises the following steps: before installation of the bearing plate, gravels are uniformly adhered to the inner surface of the bearing plate through steel adhesive; at the beginning of concrete pouring of a beam body, concrete is dispensed from a web plate on the top surface of the beam body; and after the beginning of the concrete pouring, the concrete is rammed through own flowability of the concrete and in combination of a vibrorammer, so that the concrete flows into the bearing plate completely; and after the concrete at the bearing plate is compacted, the concrete is dispensed from the end head of the beam. By a new concrete pouring method, the emptiness sound caused by incompactness at the bearing plate in the concrete pouring process of the post-tensioned box beam is effectively controlled; and the emptiness sound caused by shrinkage and creep of concrete in the later period is effectively controlled by adhering the gravels, so that the product quality is improved and the later maintenance is reduced.
Description
Technical field
The invention belongs to railway simply supported beam prefabricating technique field, be specifically related to a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling.
Background technology
In recent years, special line for passenger trains (high-speed railway) generally adopts non-fragment orbit, because the restriction of velocity standard, the ratio on bridge engineering the line is busy road is nearly 40%, and wherein majority is the prestressing force simple supported box beam, and therefore, its prefabricated construction is the most key.Precast beam generally adopts batch production production, before the erection of precast beams, first bridge pad is installed on the support plate of precast beam, be fixed in pinner by the anchor hole on the pinner through modes such as grouting by the bearing crab-bolt again, the deadweight of precast beam, the second stage of dead load and operation load all are passed to bridge pier by the bearing place, if the support plate place has on an empty stomach, when support plate carries, the bearing place may form that the sudden change formula is caved in or the formula of creeping is caved in, stability to top bridge construction, traffic safety and beam body itself has a negative impact, and can cause than major break down when serious.And at present, in the precast beam of beam making field batch production both at home and abroad, more or less exist pre-buried support plate on an empty stomach the phenomenon of sound (according to certain investigation, have the product of sound on an empty stomach account for sum about 25%), support plate is sound very harmful on an empty stomach.
Summary of the invention
The present invention provides a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling for the on an empty stomach problem of sound appears in the support plate that solves that the prefabricated middle support plate of simple supported box beam place reinforcing bar is intensive, passing property of concrete is relatively poor, be difficult for vibrating etc. and cause.
The present invention adopts following technical scheme to realize:
A kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling comprises 1) support plate inner surface bonding rubble: before support plate is installed, be pre-buried top layer of support plate rubble that evenly bonds with steel bonding glue at the support plate inner surface; 2) near the concrete support plate: when the beam body begins concreting, from beam body end face web cloth, initial cloth point positional distance support plate edge-perpendicular is apart from 1-1.5m, and near the web side form support plate, soffit formwork are installed respectively attached vibrator and vibrated; After concrete begins to build, utilize the mobile of concrete self and cooperate poker vibrator to vibrate, so that concrete flow into the support plate place fully, behind support plate place concrete compaction, begin again to begin cloth from the termination of beam.
The bonding position of described support plate inner surface rubble will be avoided the net sheet reinforcing bar of bearing place beam body, ballast grain sizes 20-25mm, its particle size matches with the particle size of concrete coarse aggregate, and arrangement pitch is 100-150mm, bonding firmly guarantees that the rubble of bonding when concrete is built is not by disturbance.The planeness of strict control beam body soffit formwork satisfies less than 2mm/m it before construction.The support plate that is bonded with rubble will be controlled four jiaos of installations of support plate discrepancy in elevation when mounted, and it is satisfied less than 2mm.The support plate that is bonded with rubble adjust in place after, utilize the reservation aperture on the support plate with nut, pad support plate to be fixed on the soffit formwork, support plate all around brushing fluid sealant seals.The vibrating spear diameter of described poker vibrator is Φ 50mm.
The present invention has following beneficial effect: effectively controlled the empty stomach sound that support plate place leakiness produces in the afterward stretch box beam concreting process by adopting new concreting method, utilize simultaneously the bonding rubble effectively to control the empty stomach sound that the later stage concrete shrinkage and creep produces, improve product quality, reduced later maintenance.
Description of drawings
Fig. 1 is the support plate floor map
Fig. 2 is that the suitable bridge of support plate is to schematic diagram
Fig. 3 is support plate bonding rubble schematic diagram
Fig. 4 is the pouring order of concrete schematic diagram
Among the figure: 1-beam body, 2-embedded sleeve barrel, 3-support plate, 4-reserves aperture, 5-rubble, 6-web, the initial cloth point of 7-, the initial line of building of 8-concrete, 9-web attached vibrator, 10-base plate attached vibrator, the A-direction across bridge, B-along bridge to, C-bearing center line, D-bearing central axis, L-rubble arrangement pitch, the vertical distance at d-cloth point and support plate edge.
The specific embodiment
By reference to the accompanying drawings the specific embodiment of the present invention is described further.
Control the on an empty stomach method of sound of post-tensioned prestressed case beam support plate, concrete sequentially near it comprised support plate inner surface bonding stone, support plate.
(1) at support plate 3 inner surfaces bonding stone, concrete grammar is as follows: before support plate 3 is installed, use the steel bonding glue rubble 5 of particle diameter as 20-25mm that evenly bond on 3 pre-buried top layers of support plate, rubble 5 arrangement pitch L are 100-150mm, rubble 5 bonding positions will be avoided the net sheet reinforcing bar of bearing place beam body, rubble 5 bondings should be firm, guarantees that the rubble of bonding when concrete is built is not by disturbance.
(2) near support plate 3 concretes in the following order: during beam body 1 beginning concreting, from beam body 1 end face web cloth, initial cloth is put 7 positional distance support plate edge-perpendicular apart from 1m, after concrete begins to build, utilize concrete self flow and fit diameter is vibrated for the vibrating spear of Φ 50mm, so that concrete flow into the support plate place fully, behind support plate place concrete compaction, begin again to begin cloth from the termination of beam.
The integral construction flow process is as follows:
1. at first strictly control the planeness of beam body soffit formwork, it is satisfied less than 2mm/m.
2. above-mentioned (1) the described method of pressing is at support plate bonding rubble 5, and the support plate 3 that is bonded with rubble will be controlled four jiaos of installations of support plate discrepancy in elevation when mounted, and it is satisfied less than 2mm.
3. support plate 3 adjust in place after, utilize reservation aperture 4 usefulness nuts, pad on the support plate 3 that support plate is fixed on the soffit formwork, support plate 3 all around brushing fluid sealant seals.
4. carry out concrete according to above-mentioned (2) described method, near web side form, the soffit formwork of while support plate 3 installed respectively attached vibrator and vibrated.
Take the construction of non-fragment orbit post stressed concrete simple supported box beam support plate as example:
Concrete steps:
1. at first strictly control the planeness of beam body 1 soffit formwork, it is satisfied less than 2mm/m.
2. at support plate 3 inner surfaces bondings rubble 5, concrete grammar is as follows: before support plate 3 is installed, use evenly bond on 3 pre-buried top layers of the support plate rubble 5 of particle diameter 20mm of steel bonding glue, the intensity of bonding rubble 5 should meet the rubble intensity that beam phosphor bodies structure is used; Rubble 5 arrangement pitch L are 100-150mm, and rubble 5 bonding positions will be avoided the net sheet reinforcing bar of bearing place beam body, and rubble 5 bondings should be firm, guarantee that the rubble of bonding when concrete is built is not by disturbance.The support plate 3 that is bonded with rubble 5 will be controlled 3 four jiaos of installations of support plate discrepancy in elevation when mounted, and it is satisfied less than 2mm.
3. support plate 3 adjust in place after, utilize reservation aperture 4 usefulness nuts, pad on the support plate 3 that support plate is fixed on the soffit formwork, support plate 3 all around brushing fluid sealant seals.
4. near support plate 3 concretes in the following order: during beam body 1 beginning concreting, from initial end face web 6 clothes of building 8 correspondences of beam body 1 concrete, it is 1m apart from d that initial cloth is put 7 positional distance support plate edge-perpendicular, after concrete began to build, near the web support plate 3 was installed an attached vibrator 9, soffit formwork is installed two attached vibrators 10.Utilize concrete self flow and fit diameter is vibrated for the internal vibration rod of Φ 50mm so that concrete flow into support plate 3 places fully, behind support plate 3 place's concrete compactions, begin again to begin cloth from the termination of beam.
By above-mentioned measure, the pre-buried support plate of prefabricated case beam on an empty stomach sound significantly decreases, and has guaranteed the quality of prefabricated case beam beam body.Implementation result sees Table 1.
Claims (6)
1. control the on an empty stomach method of sound of post-tensioned prestressed case beam support plate for one kind, 1), support plate (3) inner surface bonding rubble (5) it is characterized in that: comprising:: before support plate (3) was installed, rubble (5) evenly bondd on support plate (3) inner surface top layer; 2) near, the concrete support plate (3): when the beam body begins concreting, from beam body end face web (6) cloth, initial cloth point (7) positional distance support plate (3) edge-perpendicular distance (d) is 1-1.5m, and near the web (6) support plate (3), soffit formwork are installed respectively attached vibrator and vibrated; After concrete begins to build, utilize the mobile of concrete self and cooperate vibrator to vibrate, after support plate (3) was located concrete compaction, the termination from beam began cloth again.
2. a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling according to claim 1 is characterized in that: control the planeness of beam body soffit formwork before the construction less than 2mm/m.
3. a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling according to claim 1, it is characterized in that: the bonding position of (3) surperficial rubble (5) is avoided the net sheet reinforcing bar of bearing place beam body in the described support plate, rubble (5) particle diameter 20-25mm, arrangement pitch (L) is 100-150mm.
4. a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling according to claim 1 is characterized in that: the support plate (3) that is bonded with rubble (5) is controlled when mounted four jiaos of support plates and the discrepancy in elevation is installed less than 2mm.
5. a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling according to claim 1, it is characterized in that: the support plate (3) that is bonded with rubble (5) adjust in place after, utilize the reservation aperture (4) on the support plate (3) with nut, pad support plate to be fixed on the soffit formwork, support plate (3) is the brushing sealant sealing all around.
6. a kind of on an empty stomach method of sound of post-tensioned prestressed case beam support plate of controlling according to claim 1, it is characterized in that: the vibrating spear diameter of described poker vibrator is Φ 50mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013102411314A CN103306207A (en) | 2013-06-18 | 2013-06-18 | Method for controlling emptiness sound of bearing plate of prestressed post-tensioned box beam |
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| CN2013102411314A CN103306207A (en) | 2013-06-18 | 2013-06-18 | Method for controlling emptiness sound of bearing plate of prestressed post-tensioned box beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948275A (en) * | 2017-05-13 | 2017-07-14 | 林再颐 | A kind of cover body mounting structure of closed bridge |
| CN109505255A (en) * | 2018-12-24 | 2019-03-22 | 中铁三局集团有限公司 | Without Cast-in-Situ Segment Long Span Continuous Rigid-Frame Structure sill bolt support rotation swivel construction method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201865039U (en) * | 2010-06-12 | 2011-06-15 | 中铁十六局集团有限公司 | Dense concrete reinforcing steel plate |
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2013
- 2013-06-18 CN CN2013102411314A patent/CN103306207A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201865039U (en) * | 2010-06-12 | 2011-06-15 | 中铁十六局集团有限公司 | Dense concrete reinforcing steel plate |
Non-Patent Citations (3)
| Title |
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| 杨先凤: "客运专线预应力混凝土箱梁浇筑施工技术", 《铁道标准设计》, no. 6, 30 June 2008 (2008-06-30) * |
| 陈西建等: "武广客运专线双线整孔箱梁预制施工技术", 《建筑机械化》, vol. 28, no. 8, 31 August 2011 (2011-08-31) * |
| 顾红新: "高速铁路900t预制箱梁支座板混凝土空洞防治技术", 《国防交通工程与技术》, vol. 9, no. 3, 30 June 2011 (2011-06-30), pages 75 - 3 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106948275A (en) * | 2017-05-13 | 2017-07-14 | 林再颐 | A kind of cover body mounting structure of closed bridge |
| CN106948275B (en) * | 2017-05-13 | 2019-03-08 | 林再颐 | A kind of cover mounting structure of closed bridge |
| CN109505255A (en) * | 2018-12-24 | 2019-03-22 | 中铁三局集团有限公司 | Without Cast-in-Situ Segment Long Span Continuous Rigid-Frame Structure sill bolt support rotation swivel construction method |
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Application publication date: 20130918 |