CN109898423B - Main tower lower crossbeam prestress tensioning method and structure - Google Patents
Main tower lower crossbeam prestress tensioning method and structure Download PDFInfo
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- CN109898423B CN109898423B CN201910224046.4A CN201910224046A CN109898423B CN 109898423 B CN109898423 B CN 109898423B CN 201910224046 A CN201910224046 A CN 201910224046A CN 109898423 B CN109898423 B CN 109898423B
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Abstract
The invention discloses a method and a structure for prestress tension of a lower crossbeam of a main tower, which comprises the following steps: when a lower tower column of the main tower is constructed, a notch is reserved at the tail end of a tension position of a prestressed steel strand on the outer side of the main tower; constructing a lower cross beam on the lower tower column, wherein the position of the gap is not poured; penetrating the prestressed steel strand into the lower cross beam from the position of the notch; tensioning the prestressed steel strand; and pouring anchor sealing concrete at the position of the notch to finish the construction of the lower cross beam, and relates to the technical field of bridge construction. The invention ensures that the main ribs of the tower column are not cut off when the lower cross beam is tensioned in the prestress, thereby not only ensuring the integral structural integrity of the main tower column and effectively improving the stress performance of the main tower structure, but also being safer and more reliable, and the invention has simple tensioning operation, convenient construction, reduced construction period, more stable and more efficient construction of the whole bridge and remarkable economic benefit.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a main tower lower beam prestress tensioning method and a main tower lower beam prestress tensioning structure.
Background
Along with the rapid development of the traffic construction in China in recent years, a batch of oversized bridge spans are produced at the same time, the modeling design of the main tower has obvious influence on the full-bridge landscape, the lower beam of the main tower is mostly in a prestressed concrete structure, the prestress technology can greatly improve and enhance the bearing capacity of the reinforced concrete tension beam, the compression mechanical property of the concrete can be fully exerted, the bending rigidity of the structure is improved, the stretching of the prestress and the quality of the sealing anchor are particularly important to the stress of the structure, the traditional prestress stretching and the sealing anchor are all carried out by arranging a notch on the outer wall of the tower column, however, the traditional method not only needs to cut off the main ribs on the outer wall of the tower column in the construction process to cause the reduction of the stress performance of the whole structure, and need carry out the secondary connection to the reinforcing bar after the stretch-draw is accomplished, the field operation volume is big, can cause the huge waste of manpower, financial resources.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provide a main tower lower crossbeam prestress tensioning method and a main tower lower crossbeam prestress tensioning structure which do not need to cut off main reinforcements of a tower column, enable the stress of a main tower structure to be safer and more reliable and are convenient to construct.
The invention provides a main tower lower crossbeam prestress tensioning method, which comprises the following steps:
when a lower tower column of the main tower is constructed, a notch is reserved at the tail end of a tension position of a prestressed steel strand on the outer side of the main tower;
constructing a lower cross beam on the lower tower column, wherein the position of the gap is not poured;
penetrating the prestressed steel strand into the lower cross beam from the position of the notch;
tensioning the prestressed steel strand;
and pouring anchor sealing concrete at the position of the notch to finish the construction of the lower cross beam.
On the basis of the technical scheme, the shape of the notch is matched with that of the main tower, and the notch penetrates through the main tower along the longitudinal bridge direction.
On the basis of the technical scheme, the prestress steel strand is arranged in the lower cross beam along the length direction of the lower cross beam.
On the basis of the technical scheme, the prestressed steel strands are respectively arranged on the upper side and the lower side in the lower cross beam.
On the basis of the technical scheme, a plurality of groups of prestressed steel strands are arranged in the lower cross beam at intervals along the width direction of the lower cross beam, and each group of prestressed steel strands comprises a plurality of prestressed steel strands.
The invention also provides a main tower lower beam prestress tensioning structure, which comprises:
the main tower comprises a left lower tower column and a right lower tower column;
the lower cross beam is spanned between the two lower tower columns, and prestressed steel strands are tensioned in the lower cross beam;
and the anchor sealing concrete is arranged at the tail end of the tensioning position of the prestressed steel strand outside the main tower.
On the basis of the technical scheme, the prestress steel strand is arranged in the lower cross beam along the length direction of the lower cross beam.
On the basis of the technical scheme, the prestressed steel strands are respectively arranged on the upper side and the lower side in the lower cross beam.
On the basis of the technical scheme, a plurality of groups of prestressed steel strands are arranged in the lower cross beam at intervals along the width direction of the lower cross beam, and each group of prestressed steel strands comprises a plurality of prestressed steel strands.
Compared with the prior art, the invention has the following advantages:
the invention adopts the notch reserved on the outer side of the main tower as the construction space for prestress tensioning and anchor sealing pouring, and the prestress steel strand is tensioned at the notch position, so that the main rib of the tower column is not cut off when the lower beam is tensioned in prestress, compared with the traditional method that the notch is arranged on the outer wall of the tower column for prestress tensioning and anchor sealing, the invention not only ensures the integral structural integrity of the tower column of the main tower, effectively improves the stress performance of the main tower structure, and leads the main tower structure to be safer and more reliable, but also has simple tensioning operation, convenient construction, and time-saving construction period, leads the whole bridge construction to be more stable and efficient, and has obvious economic benefit.
Drawings
FIG. 1 is a schematic diagram of a main tower reserved notch structure of a main tower lower beam prestress tensioning method according to an embodiment of the invention;
FIG. 2 is a front view of a prestressed tension structure of a lower beam of a main tower according to an embodiment of the present invention;
FIG. 3 is a top view of a prestressed tension structure of a lower beam of a main tower according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of the anchor sealing end of the prestressed tension structure of the lower beam of the main tower according to the embodiment of the present invention.
Reference numerals: the method comprises the following steps of 1-main tower, 2-gap, 3-lower tower column, 4-lower cross beam, 5-prestressed steel strand and 6-anchor sealing concrete.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1 to 2, an embodiment of the present invention provides a method for pre-stressing and tensioning a lower cross beam of a main tower, including:
when a lower tower column 3 of a main tower 1 is constructed, a gap 2 is reserved at the tail end of a tensioning position of a prestressed steel strand 5 on the outer side of the main tower 1;
constructing a lower cross beam 4 on the lower tower column 3, wherein the position of the gap 2 is not poured;
penetrating the prestressed steel strand 5 into the lower cross beam 4 from the position of the notch 2;
tensioning the prestressed steel strand 4;
and pouring anchor sealing concrete 6 at the position of the notch 2 to finish the construction of the lower cross beam 4.
The invention adopts the notch 2 reserved outside the main tower 1 as the construction space for prestress tensioning and anchor sealing pouring, and the prestress steel strand 5 is tensioned at the position of the notch 2, so that the main rib of the tower column is not cut off when the lower beam 4 is tensioned in prestress, compared with the traditional method that the notch is arranged on the outer wall of the tower column for prestress tensioning and anchor sealing, the invention not only ensures the integral structural integrity of the tower column of the main tower 1, effectively improves the stress performance of the structure of the main tower 1, and ensures that the construction is safer and more reliable, but also has simple tensioning operation, convenient construction and reduced construction period, and ensures that the whole bridge construction is more stable and efficient, and the economic benefit is obvious.
On the basis of the technical solution of the above embodiment, further, as shown in fig. 1, the shape of the notch 2 matches the shape of the main tower 1, and the notch 2 is arranged to penetrate through the main tower 1 along the longitudinal bridge direction; the shape of the notch 2 is matched with the shape of the main tower 1, the position of the notch 2 is used as a construction reserved space for prestress tensioning and anchor sealing pouring, after prestress tensioning is finished, anchor sealing concrete 6 is poured at the position of the notch 2, construction of the lower cross beam 4 is finished, the structural integrity of the main tower 1 is ensured, the stress of the main tower is more uniform, and the appearance is more attractive.
On the basis of the technical scheme of the embodiment, the prestressed steel strand 5 is further arranged in the lower cross beam 4 along the length direction of the lower cross beam 4; the prestressed steel strands 5 arranged along the length direction of the lower cross beam 4 can greatly improve and enhance the bearing capacity of the reinforced concrete tensioning lower cross beam 4, do not cut vertical steel bars, maintain the integrity of the structure, fully play the compression mechanical properties of concrete, enhance the integral bending rigidity of the structure and enhance the integral mechanical properties of the bridge.
On the basis of the technical solution of the above embodiment, further, as shown in fig. 2 to 4, the prestressed steel strands 5 are respectively arranged on the upper and lower sides in the lower cross beam 4; furthermore, a plurality of groups of prestressed steel strands 5 are arranged in the lower cross beam 4 at intervals along the width direction of the lower cross beam 4, and each group comprises a plurality of prestressed steel strands 5; the prestressed steel strands 5 in the lower cross beam 4 can reasonably arrange a tensioning sequence according to actual construction requirements, the difference between the left and right side internal forces of the oversized cross-bridge main tower 1 is reduced, the uneven distribution of the internal stress of the lower cross beam 4 is reduced, the risk in the bridge construction process is reduced, and the construction safety degree and the bridge construction quality are improved.
Referring to fig. 2 to 4, an embodiment of the present invention further provides a prestressed tension structure of a lower beam of a main tower, including:
the tower comprises a main tower 1, wherein the main tower 1 comprises a left lower tower column 3 and a right lower tower column 3;
the lower cross beam 4 is spanned between the two lower tower columns 3, and a prestressed steel strand 5 is tensioned in the lower cross beam 4;
and the anchor sealing concrete 6 is arranged at the tail end of the tensioning position of the prestressed steel strand 5 outside the main tower 1.
According to the prestressed tensioning structure of the lower cross beam of the main tower, the main ribs of the tower column are not cut off when the lower cross beam 4 is subjected to prestressed tensioning, so that the integral structural integrity of the tower column of the main tower 1 is ensured, the stress performance of the structure of the main tower 1 is effectively improved, the structure is safer and more reliable, the tensioning operation is simple, the construction is convenient, the construction period is saved, the whole bridge construction is more stable and efficient, and the economic benefit is remarkable.
On the basis of the technical scheme of the embodiment, the prestressed steel strand 5 is further arranged in the lower cross beam 4 along the length direction of the lower cross beam 4; the prestressed steel strands 5 arranged along the length direction of the lower cross beam 4 can greatly improve and enhance the bearing capacity of the reinforced concrete tensioning lower cross beam 4, do not cut vertical steel bars, maintain the integrity of the structure, fully play the compression mechanical properties of concrete, enhance the integral bending rigidity of the structure and enhance the integral mechanical properties of the bridge.
On the basis of the technical solution of the above embodiment, further, as shown in fig. 2 to 4, the prestressed steel strands 5 are respectively arranged on the upper and lower sides in the lower cross beam 4; furthermore, a plurality of groups of prestressed steel strands 5 are arranged in the lower cross beam 4 at intervals along the width direction of the lower cross beam 4, and each group comprises a plurality of prestressed steel strands 5; the prestressed steel strands 5 in the lower cross beam 4 can reasonably arrange a tensioning sequence according to actual construction requirements, the difference between the left and right side internal forces of the oversized cross-bridge main tower 1 is reduced, the uneven distribution of the internal stress of the lower cross beam 4 is reduced, the risk in the bridge construction process is reduced, and the construction safety degree and the bridge construction quality are improved.
Various modifications and variations of the embodiments of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention, provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (2)
1. A main tower lower beam prestress tensioning method is characterized by comprising the following steps:
when a lower tower column (3) of a main tower (1) is constructed, a notch (2) is reserved at the tail end of a tensioning position of a prestressed steel strand (5) on the outer side of the main tower (1), the position of the notch (2) is used as a construction reserved space for prestressed tensioning and anchor sealing pouring, the shape of the notch (2) is matched with the shape of the main tower (1), and the notch (2) penetrates through the main tower (1) along the longitudinal bridge direction;
constructing a lower cross beam (4) on the lower tower column (3), wherein the position of the gap (2) is not poured;
prestress steel strands (5) penetrate into the upper side and the lower side of the lower cross beam (4) from the position of the notch (2) along the length direction of the lower cross beam (4), a plurality of groups of prestress steel strands (5) are arranged in the lower cross beam (4) at intervals along the width direction of the lower cross beam (4), and each group comprises a plurality of prestress steel strands (5);
the prestressed steel strand (5) is tensioned at the outer side of the main tower (1), a tensioning sequence is arranged according to actual construction requirements, the difference between the left and right inner forces of the main tower (1) of the oversized bridge span is reduced, and the uneven distribution of the internal stress of the lower cross beam (4) is reduced;
and pouring anchor sealing concrete (6) at the position of the notch (2) to complete the construction of the lower cross beam (4), so that the structural integrity of the main tower (1) is ensured, the stress is more uniform, and the appearance is more attractive.
2. The utility model provides a main tower bottom end rail prestressing force tension structure which characterized in that, it includes:
the tower comprises a main tower (1), wherein the main tower (1) comprises a left lower tower column (3) and a right lower tower column (3);
the lower cross beam (4) is arranged between the two lower tower columns (3) in a spanning mode, the upper side and the lower side of the inner portion of the lower cross beam (4) are tensioned with prestressed steel strands (5) according to the tensioning method of claim 1 along the length direction of the lower cross beam (4), a plurality of groups of prestressed steel strands (5) are arranged in the lower cross beam (4) at intervals along the width direction of the lower cross beam (4), and each group comprises a plurality of prestressed steel strands (5);
and the anchor sealing concrete (6), wherein the anchor sealing concrete (6) is arranged at the tail end of the tensioning position of the prestressed steel strand (5) on the outer side of the main tower (1).
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| CN113174828B (en) * | 2021-04-29 | 2022-02-15 | 中铁大桥勘测设计院集团有限公司 | Bridge tower upper cross beam and design method thereof |
| CN113481846A (en) * | 2021-06-26 | 2021-10-08 | 华设设计集团股份有限公司 | UHPC beam unit for bridge tower, UHPC beam, bridge tower and construction method thereof |
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| CN106436576A (en) * | 2016-08-24 | 2017-02-22 | 广西长长路桥建设有限公司 | Constructing method of main tower of cable-stayed bridge through circumferential prestressing force |
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| CN104975566B (en) * | 2013-12-26 | 2016-08-24 | 中铁上海工程局集团有限公司 | Apply the steel pipe support in cable-stayed bridge arch tower is constructed |
| CN104005338B (en) * | 2014-05-06 | 2016-08-03 | 中铁港航局集团有限公司 | A kind of long-span cablestayed bridges tower beam three-dimensional temporary consolidation structure |
| CN108035239A (en) * | 2018-01-19 | 2018-05-15 | 郑州市交通规划勘察设计研究院 | Bridge tower and partial cable-stayed bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106436576A (en) * | 2016-08-24 | 2017-02-22 | 广西长长路桥建设有限公司 | Constructing method of main tower of cable-stayed bridge through circumferential prestressing force |
Non-Patent Citations (1)
| Title |
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| [浙江]大桥工程下横梁预应力施工方案;i88126964h的店;《百度文库》;20181128;第4页下横梁预应力施工及附图1.3 * |
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