CN111455847A - Layered construction method suitable for bridge tower high haunch upper beam - Google Patents
Layered construction method suitable for bridge tower high haunch upper beam Download PDFInfo
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- CN111455847A CN111455847A CN202010172328.7A CN202010172328A CN111455847A CN 111455847 A CN111455847 A CN 111455847A CN 202010172328 A CN202010172328 A CN 202010172328A CN 111455847 A CN111455847 A CN 111455847A
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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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- 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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
Abstract
The invention discloses a layered construction method suitable for a bridge tower height haunched upper beam, which comprises the following steps: installing a construction support; laying a bottom die on the construction support; binding steel bars of the first construction layer, installing a side mold of the first construction layer, wherein the height of the side mold is smaller than that of the top of the construction support, and pouring concrete of the first construction layer to obtain a first layer upper beam and a first layer tower column; binding the steel bars of the second construction layer, installing a side mold of the second construction layer, wherein the height of the side mold is greater than that of the top of the construction support, and pouring concrete of the second construction layer to obtain an upper cross beam of the second layer and a tower column of the second layer; and binding steel bars of the third construction layer, installing a side mold of the third construction layer, pouring concrete of the third construction layer to obtain a third-layer upper beam and a third-layer tower column, wherein the first-layer upper beam, the second-layer upper beam and the third-layer upper beam form an upper beam together. The invention fully utilizes the poured concrete to support the newly poured concrete on the upper layer, and can reduce the stress of the construction support.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a layered construction method suitable for a bridge tower height haunched upper crossbeam.
Background
The H-type or A-type bridge tower is a bridge tower form commonly adopted in the current bridge design, and the construction method of the upper cross beam generally comprises two methods:
firstly, construction by a high support method: namely a floor stand method, a stand is erected from the top surface of a bearing platform or the top surface of a lower cross beam. The disadvantages are as follows: a large number of steel pipe supports need to be erected, the hoisting workload is large during installation and removal, the overhead welding workload is large, great overhead operation risks exist, and the steel pipe supports are long in assembly and disassembly period.
Secondly, adopting a non-landing support for construction: during construction of the method, the support needs to bear most of the weight of the cross beam.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a layered construction method suitable for a bridge tower height haunched upper beam, and a method for supporting upper layer newly poured concrete by fully utilizing poured concrete so as to reduce the stress of a construction support.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
a layered construction method suitable for a bridge tower high haunch upper crossbeam comprises the following steps:
installing a construction support at a designed position between the poured sections of the two tower columns;
laying a bottom die on the construction support;
binding steel bars of the first construction layer, installing a side form of the first construction layer, wherein the height of the side form of the first construction layer is smaller than that of the top of the construction support, and pouring concrete of the first construction layer to obtain a first layer upper cross beam and a first layer tower column;
binding reinforcing steel bars of the second construction layer, installing a side form of the second construction layer, wherein the height of the side form of the second construction layer is larger than that of the top of the construction support, and pouring concrete of the second construction layer to obtain an upper cross beam of the second layer and a tower column of the second layer;
and binding steel bars of the third construction layer, installing a side mold of the third construction layer, pouring concrete of the third construction layer to obtain a third-layer upper beam and a third-layer tower column, wherein the first-layer upper beam, the second-layer upper beam and the third-layer upper beam jointly form an upper beam.
Further, before the concrete of the first construction layer is poured, the layered construction method further comprises the step of additionally arranging tensile steel bars in the first construction layer.
Further, when concrete of the second construction layer is poured, the following conditions are met: the concrete of the first construction layer reaches first preset strength.
Further, the first preset intensity is 90% of the design intensity.
Further, the air conditioner is provided with a fan,
before pouring concrete of a second construction layer, the layered construction method further comprises the step of additionally arranging an upper crossbeam web prestressed beam in the second construction layer;
and when the concrete of the second construction layer to be poured reaches a second preset strength, tensioning the upper beam web prestressed bundles according to the design requirement.
Further, the second preset intensity is 90% of the design intensity.
Further, before concrete of a third construction layer is poured, the layered construction method further comprises the step of additionally arranging the prestressed bundles of the top plate of the upper crossbeam in the third construction layer;
and when the concrete of the third construction layer to be poured reaches a third preset strength, tensioning the upper crossbeam top plate prestressed bundles according to the design requirements.
Further, the third preset intensity is 90% of the design intensity.
Furthermore, the cross section of the construction support along the transverse bridge direction is in an isosceles trapezoid or an arc shape.
Further, before installing the construction bracket, the layered construction method further comprises: and a protection platform is arranged between the poured sections of the two tower columns and is positioned below the construction support.
Compared with the prior art, the invention has the advantages that:
according to the invention, by reasonably arranging the pouring layering and fully utilizing the method of supporting the newly poured concrete on the upper layer by the poured concrete, the stress of the construction support is reduced, and the material consumption is saved.
Specifically, the first construction layer of the armpit is poured firstly, the tensile steel bar is additionally arranged on the top surface of the first construction layer, so that the concrete structure of the first construction layer forms a concrete corbel after reaching the strength, and when the concrete of the second construction layer is poured, the first construction layer forms supports for two sides of the concrete of the second construction layer, and the construction support only bears the load of the middle part, so that the structural consumption of the construction support can be reduced; and after the concrete structure of the second construction layer reaches the strength, the third construction layer concrete can be supported, and the construction support only bears less load.
Drawings
FIG. 1 is a schematic diagram of a construction bracket installed in a layered construction method according to an embodiment of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the first construction layer after casting;
FIG. 4 is a schematic view of the second construction layer after casting;
fig. 5 is a schematic diagram of the third construction layer after pouring is completed.
In the figure: A. a first construction layer; B. a second construction layer; C. a third construction layer; 1. a tower column; 10. a cast section; 11. a first layer of tower columns; 12. a second layer of tower columns; 13. a third layer of tower column; 14. embedding parts; 15. a bracket; 16. a support bottom distribution beam; 2. constructing a support; 20. a holder unit; 21. a linking system; 3. bottom die; 4. an upper cross beam; 40. a first layer of upper cross beams; 41. a second layer of upper cross beams; 42. a third layer of upper cross beams; 5. tensile steel bars; 6. an upper beam web prestressed tendon; 7. the top plate of the upper crossbeam is prestressed; 8. a protection platform; 9. a lowering mechanism; 90. lowering the distribution beam; 91. a jack; 92. and (4) steel strands.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The embodiment of the invention provides a layered construction method suitable for a bridge tower height haunched upper crossbeam, which comprises the following steps:
s1: referring to fig. 1, a construction bracket 2 is installed at a designed position between poured sections 10 of two towers 1;
specifically, an embedded part 14 is installed at a design position, and a prestressed beam in a circumferential prestressed pipeline in a tower column 1 near the embedded part 14 is tensioned and grouted; welding brackets 15 on the embedded parts 14, mounting cushion blocks on the brackets, and mounting support bottom distribution beams 16 on the cushion blocks;
referring to fig. 2, the construction prop 2 is assembled by a plurality of prop units 20 having the same shape through a coupling system 21, and the first three prop units 20 should be hoisted in place as soon as possible and connected into a stable structure when the construction prop 2 is installed.
Referring to fig. 1, the cross section of the construction bracket 2 along the transverse bridge direction is isosceles trapezoid, but it can also be arc-shaped, and the shape is mainly matched with that of the upper beam.
In order to ensure the construction safety, a protection platform 8 is required to be installed between the poured sections 10 of the two tower columns 1, the protection platform 8 is located below the construction support 2, the installation of the protection platform 8 and the construction support 2 is not limited in sequence, the protection platform 8 can be installed firstly or later, but is preferably installed firstly.
S2: referring to fig. 1, a support top distribution beam (not shown) is laid on a construction support 2, and a bottom die 3 is laid on the support top distribution beam;
s3: binding the steel bars of the first construction layer A, installing a side form of the first construction layer A, wherein the height of the side form of the first construction layer A is smaller than that of the top of the construction support 2, and pouring concrete of the first construction layer A to obtain a first layer upper cross beam 40 and a first layer tower column 11, which are shown in figure 3; during casting, the cast sections 10 of the two towers 1 are symmetrically cast.
Referring to fig. 3, before the concrete of the first construction layer a is poured, tensile steel bars 5 may be additionally arranged in the first construction layer a.
S4: binding reinforcing steel bars of a second construction layer B, installing side forms of the second construction layer B, wherein the height of the side forms of the second construction layer B is larger than that of the top of the construction support 2, additionally arranging an upper crossbeam web prestressed beam 6 in the second construction layer B, when the poured concrete of the first construction layer A reaches a first preset strength, pouring the concrete of the second construction layer B, and when the poured concrete of the second construction layer B reaches a second preset strength, tensioning the upper crossbeam web prestressed beam 6 according to design requirements to obtain an upper crossbeam 41 of the second construction layer and a tower column 12 of the second construction layer, wherein the first preset strength is 90% of the design strength, and the second preset strength is 90% of the design strength in the embodiment shown in figure 4;
s5: binding steel bars of a third construction layer C, installing a side mold of the third construction layer C, additionally arranging an upper crossbeam roof prestressed bundle 7 in the third construction layer C, pouring concrete of the third construction layer C, stretching the upper crossbeam roof prestressed bundle 7 according to design requirements when the poured concrete of the third construction layer C reaches a third preset strength to obtain a third layer upper crossbeam 42 and a third layer tower column 13, wherein the first layer upper crossbeam 40, the second layer upper crossbeam 41 and the third layer upper crossbeam 42 jointly form an upper crossbeam 4, the poured section 10, the first layer tower column 11, the second layer tower column 12 and the third layer tower column 13 jointly form a tower column 1, and the third preset strength is 90% of the design strength, as shown in figure 5.
S6: as shown in fig. 5, the protection platform 8 is removed, the lowering mechanism 9 is installed, the lowering mechanism 9 comprises two lowering distribution beams 90, four jacks 91 and a plurality of steel strands 92, the two lowering distribution beams 90 are respectively assembled on two sides of the top of the upper cross beam 4, two jacks 91 are respectively arranged at two ends of each lowering distribution beam 90, the steel strands 92 penetrate between the continuous jacks 91 and the support bottom distribution beams 16, the connection between the bracket 15 and the support bottom distribution beams 16 is cut, and the jacks 91 synchronously lift the construction support 2 to separate the construction support 2 from the bracket 15, and then the bracket 15 is removed; and synchronously and integrally lowering the construction support 2 to the top surface of the lower beam of the main tower or the top surface of the steel beam of the main bridge.
According to the invention, by reasonably arranging the pouring layering and fully utilizing the method of supporting the newly poured concrete on the upper layer by the poured concrete, the stress of the upper beam support is reduced, and the material consumption is saved.
Specifically, the first construction layer of the armpit is poured firstly, the tensile steel bar is additionally arranged on the top surface of the first construction layer, so that the concrete structure of the first construction layer forms a concrete corbel after reaching the strength, and when the concrete of the second construction layer is poured, the first construction layer forms supports for two sides of the concrete of the second construction layer, and the construction support only bears the load of the middle part, so that the structural consumption of the construction support can be reduced; and after the concrete structure of the second construction layer reaches the strength, the third construction layer concrete can be supported, and the construction support only bears less load.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. A layered construction method suitable for a bridge tower high haunch upper crossbeam is characterized by comprising the following steps:
installing a construction bracket (2) at a designed position between the poured sections (10) of the two tower columns (1);
paving a bottom die (3) on the construction support (2);
binding steel bars of the first construction layer (A), installing side molds of the first construction layer (A), wherein the height of the side molds of the first construction layer (A) is smaller than that of the top of the construction support (2), and pouring concrete of the first construction layer (A) to obtain a first layer upper beam (40) and a first layer tower column (11);
binding steel bars of the second construction layer (B), installing a side form of the second construction layer (B), wherein the height of the side form of the second construction layer (B) is larger than that of the top of the construction support (2), and pouring concrete of the second construction layer (B) to obtain an upper cross beam (41) of the second layer and a tower column (12) of the second layer;
and (2) binding steel bars of the third construction layer (C), installing a side mold of the third construction layer (C), pouring concrete of the third construction layer (C) to obtain a third-layer upper cross beam (42) and a third-layer tower column (13), wherein the first-layer upper cross beam (40), the second-layer upper cross beam (41) and the third-layer upper cross beam (42) jointly form an upper cross beam (4).
2. The layered construction method according to claim 1, wherein: before concrete of the first construction layer (A) is poured, the layered construction method further comprises the step of additionally arranging tensile steel bars (5) in the first construction layer (A).
3. The layered construction method according to claim 1, characterized in that in casting the concrete of the second construction layer (B), the condition is satisfied: the concrete of the first construction layer (A) is poured to reach first preset strength.
4. The layered construction method according to claim 3, wherein: the first preset intensity is 90% of the design intensity.
5. The layered construction method according to claim 1, wherein:
before concrete of a second construction layer (B) is poured, the layered construction method further comprises the step of additionally arranging an upper crossbeam web prestressed beam (6) in the second construction layer (B);
and when the concrete of the second construction layer (B) to be poured reaches a second preset strength, tensioning the upper beam web prestressed bundles (6) according to the design requirements.
6. The layered construction method according to claim 5, wherein: the second predetermined strength is 90% of the design strength.
7. The layered construction method according to claim 1, wherein:
before concrete of a third construction layer (C) is poured, the layered construction method further comprises the step of additionally arranging an upper crossbeam top plate prestressed bundle (7) in the third construction layer (C);
and when the concrete of the third construction layer (C) to be poured reaches a third preset strength, tensioning the upper crossbeam top plate prestress beam (7) according to the design requirement.
8. The layered construction method according to claim 7, wherein: the third predetermined intensity is 90% of the design intensity.
9. The layered construction method according to claim 1, wherein: the construction support (2) is in an isosceles trapezoid or arc shape along the cross section of the transverse bridge.
10. The layered construction method according to claim 1, wherein before installing the construction bracket (2), the layered construction method further comprises: a protection platform (8) is arranged between the poured sections (10) of the two tower columns (1), and the protection platform (8) is located below the construction support (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010172328.7A CN111455847A (en) | 2020-03-12 | 2020-03-12 | Layered construction method suitable for bridge tower high haunch upper beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010172328.7A CN111455847A (en) | 2020-03-12 | 2020-03-12 | Layered construction method suitable for bridge tower high haunch upper beam |
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| CN111455847A true CN111455847A (en) | 2020-07-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112878197A (en) * | 2021-01-12 | 2021-06-01 | 中铁二局集团有限公司 | Cast-in-place construction method for concrete beam self-supporting method of cable-stayed bridge |
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2020
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Application publication date: 20200728 |
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