CN113123245A - Method for constructing post-installation prestressed corrugated pipe of concrete beam bridge cast-in-place closure section - Google Patents
Method for constructing post-installation prestressed corrugated pipe of concrete beam bridge cast-in-place closure section Download PDFInfo
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- CN113123245A CN113123245A CN202110419537.1A CN202110419537A CN113123245A CN 113123245 A CN113123245 A CN 113123245A CN 202110419537 A CN202110419537 A CN 202110419537A CN 113123245 A CN113123245 A CN 113123245A
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- corrugated pipe
- prestressed
- end head
- pipe body
- loading
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009434 installation Methods 0.000 title description 4
- 230000002787 reinforcement Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 229920001821 foam rubber Polymers 0.000 claims abstract description 5
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 229920001903 high density polyethylene Polymers 0.000 claims description 3
- 239000004700 high-density polyethylene Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 12
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920000114 Corrugated plastic Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004023 plastic welding Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a method for constructing a post-loading prestressed corrugated pipe of a cast-in-place closure section of a concrete beam bridge, which comprises the following implementation steps of: mounting prestressed reinforcement bars on the closure segments; sleeving a post-installed prestressed corrugated pipe on the periphery of the prestressed reinforcement; positioning and installing two ends of the post-installed prestressed corrugated pipe body on the cantilever section pre-embedded corrugated pipe and fastening the post-installed prestressed corrugated pipe body; inserting a sealing gasket between the upper end head and the lower end head of the afterloading prestressed corrugated pipe; penetrating a bolt in the bolt assembly through bolt holes formed in the upper end head and the lower end head, and screwing a nut in the bolt assembly; coating foam rubber on two ends of the post-loading prestressed corrugated pipe body for plugging; and pouring concrete on the periphery of the after-loading prestressed corrugated pipe, then tensioning prestressed reinforcements, and finally grouting in the inner cavity of the after-loading prestressed corrugated pipe body. The method has the advantages of simple and convenient site construction process and good sealing effect, and ensures the construction quality and the construction period.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a method for constructing an after-loading prestressed corrugated pipe of a cast-in-place closure section of a concrete beam bridge.
Background
Bridges such as a large-span cast-in-place continuous beam bridge or a continuous rigid frame bridge are generally connected with a main bridge structure through a post-pouring closure section. The closure section is a prestressed member, and concrete is poured firstly and then prestressed reinforcement tensioning is carried out, so that a corrugated pipe needs to be installed before concrete pouring to form a post-tensioned prestressed duct, and a plastic corrugated pipe or a metal corrugated pipe is usually used. When the corrugated pipe is used as a prestressed duct, the theoretical procedures are as follows: installing corrugated pipe → pouring concrete → penetrating prestressed reinforcement → tensioning → grouting corrugated pipe. Due to the influence of site construction conditions, the actual operation procedures in construction are generally as follows: installing prestressed reinforcement → installing corrugated pipe → pouring concrete → tensioning → grouting corrugated pipe, which is contrary to the theoretical process.
In the practical operation process, the annular corrugated pipe is usually cut along the longitudinal direction, and the rear sleeve wraps the prestressed steel bars. Then the following two sealing modes are adopted for the corrugated pipe:
firstly, wrapping the corrugated pipe by using plastic color strip cloth, tightly winding the corrugated pipe, and then pouring concrete. Under this kind of operating mode, local concrete is not enough with prestressing force pipeline parcel power, can't satisfy the design requirement, concrete quality accident easily appears.
And secondly, welding the notch by using a plastic welding machine on site or bonding the notch by using an adhesive material. Under the working condition, the field operation difficulty is high, and the construction period is easily delayed; the risk of concrete leakage exists, the prestressed pipeline is easy to block, and the construction quality is not easy to guarantee.
Disclosure of Invention
The invention aims to provide a method for constructing a post-installed prestressed corrugated pipe of a cast-in-place closure section of a concrete beam bridge, which is convenient for field construction and improves construction quality.
In order to achieve the purpose, the invention discloses a method for constructing an after-loading prestressed corrugated pipe of a cast-in-place closure section of a concrete beam bridge, which comprises the following steps:
1) mounting prestressed reinforcement bars on the closure segments;
2) sleeving a post-installed prestressed corrugated pipe on the periphery of the prestressed steel bars, completely wrapping the prestressed steel bars into the inner cavity of the corrugated pipe body, positioning and installing two ends of the corrugated pipe body on the cantilever section pre-embedded corrugated pipe, and fastening;
3) inserting a sealing gasket between the upper end head and the lower end head of the afterloading prestressed corrugated pipe;
4) penetrating a bolt in the bolt assembly through bolt holes formed in the upper end head and the lower end head, and screwing a nut in the bolt assembly;
5) coating foam rubber on two ends of the post-loading prestressed corrugated pipe body for plugging;
6) and pouring concrete on the periphery of the after-loading prestressed corrugated pipe, then tensioning the prestressed reinforcement, and finally grouting in the inner cavity of the corrugated pipe body.
Furthermore, the afterloading prestressed corrugated pipe comprises a corrugated pipe body for sleeving prestressed steel bars, the prestressed steel bars are in clearance fit with the corrugated pipe body, an axial opening is formed in the pipe wall of the corrugated pipe body and penetrates through the axial pipe wall of the corrugated pipe body, the upper side and the lower side of the axial opening extend along the radial direction to form an upper end head and a lower end head which are symmetrical up and down, a sealing gasket matched with the upper end head and the lower end head is arranged between the upper end head and the lower end head, and the upper end head and the lower end head are connected through a bolt assembly, so that a sealing structure is formed in the inner cavity of the corrugated pipe body.
Furthermore, the corrugated pipe body, the upper end head and the lower end head are of an integral structure and are formed by one-time extrusion of a high-density polyethylene material.
The method for constructing the post-loading prestressed corrugated pipe of the cast-in-place closure section of the concrete beam bridge has the advantages of simple and convenient site construction process and good sealing effect, and ensures the construction quality and the construction period.
Drawings
FIG. 1 is a schematic diagram of the installation of an after-loading prestressed corrugated pipe in the method for constructing the after-loading prestressed corrugated pipe of the cast-in-place closure section of the concrete beam bridge, which is provided by the invention;
FIG. 2 is a schematic diagram of an appearance structure of an after-loading prestressed corrugated pipe in the method for constructing the after-loading prestressed corrugated pipe of the cast-in-place closure section of the concrete beam bridge, which is provided by the invention;
FIG. 3 is a radial cross-sectional view of an after-loading prestressed corrugated pipe in the method for constructing the after-loading prestressed corrugated pipe of the cast-in-place closure section of the concrete beam bridge, which is provided by the invention;
FIG. 4 is a parameter schematic diagram of an after-loading prestressed corrugated pipe in the method for constructing the after-loading prestressed corrugated pipe of the cast-in-place closure section of the concrete beam bridge, which is provided by the invention;
in the figure:
afterwards loading a prestressed corrugated pipe (comprising a corrugated pipe body 1, an upper end 21, a lower end 22, a sealing gasket 3, a bolt assembly 4), a cantilever section pre-embedded corrugated pipe 5 and a foam rubber plug 6;
the wave depth coefficient K, the inner diameter D of the corrugated pipe, the outer diameter D of the corrugated pipe, the wall thickness h, the wave distance t, the wave width a, the radius R of a fillet with an outer corrugation, the radius R of the fillet with an inner corrugation, and the width w of an upper end and a lower end.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1 to 4, the method for constructing the post-loading prestressed corrugated pipe of the cast-in-place closure section of the concrete beam bridge comprises the following implementation steps:
1) and mounting the prestressed reinforcement on the closure segment.
2) And sleeving a post-installed prestressed corrugated pipe on the periphery of the prestressed steel bars, so that the prestressed steel bars are completely wrapped in the inner cavity of the corrugated pipe body 1, positioning and installing two ends of the corrugated pipe body 1 on the cantilever section pre-embedded corrugated pipe 5, and fastening.
The adopted post-installation prestressed corrugated pipe suitable for the cast-in-place closure section of the concrete beam bridge comprises a corrugated pipe body 1 for sleeving prestressed reinforcements, the prestressed reinforcements are in clearance fit with the corrugated pipe body 1, an axial opening is formed in the pipe wall of the corrugated pipe body 1 and penetrates through the axial pipe wall of the corrugated pipe body 1, the upper side and the lower side of the axial opening radially extend to form an upper end head 21 and a lower end head 22 which are symmetrical up and down, a sealing gasket 3 matched with the upper end head 21 and the lower end head 22 is arranged between the upper end head 21 and the lower end head 22, and the upper end head 21 and the lower end head 22 are connected through a bolt assembly 4, so that an inner cavity of the corrugated pipe body 1 forms a sealing structure.
The corrugated pipe body 1, the upper end head 21 and the lower end head 22 are of an integral structure and are formed by one-time extrusion of high-density polyethylene materials.
The geometric parameters of the after-loading prestressed corrugated pipe suitable for the cast-in-place closure section of the concrete beam bridge are as follows:
the depth of wave K (also called the bulge coefficient) is the ratio of the outside diameter to the inside diameter of the corrugated pipe (i.e., K ═ D/D), which is an important parameter in determining the geometry of the corrugated plastic pipe. In the case of a defined inner diameter d, the greater the value of K, the greater the height of the corrugation. The K value influences the performance of the corrugated pipe and the forming process of the corrugated pipe, and the forming difficulty of the corrugated pipe is increased along with the increase of the K value. In order to control the difficulty of one-step molding of the integral structure formed by the corrugated pipe body 1 and the upper end head 21 and the lower end head 22, the wave depth coefficient K of the corrugated pipe body 1 is maintained between 1.1 and 1.4. The value of the inner diameter D of the corrugated pipe body 1 is 90mm, the value of the outer diameter D is 114mm, and the value of K is 1.27.
The bellows wall thickness h is also an important geometrical parameter. The main properties of the bellows, such as the working ring stress or the ring stiffness, depend on the geometry of the bellows, in particular its wall thickness. The wall thickness h of the corrugated pipe body 1, the upper end head 21 and the lower end head 22 is 2.5 mm.
The wave distance t is an important parameter of the corrugated pipe structure, and influences the effective length and the performance of the corrugated pipe. The variation trend of the wave distance t is as follows: the size increases with increasing inner diameter d, and the percentage of inner diameter d decreases with increasing inner diameter d. The wave thickness a refers to the larger width of the axial surface of the outer corrugated part, and after the wave distance t is determined, the wave thickness a directly influences the wave form angle, the fillet radius R of the wave crest and the fillet radius R of the wave trough. When the wave distance t and the wave thickness a are determined, the wave form angle, the fillet radius R of the wave crest and the fillet radius R of the wave trough are also determined. The wave distance t of this embodiment bellows body 1 takes 13mm, and wave thickness a takes 6mm, and the fillet radius R that obtains the crest is 3mm, and the fillet radius R of trough is 2 mm.
Wave-shaped refers to a wave pattern and shape taken along the axial direction. The corrugated shape of the corrugated tube affects the stiffness, displacement and pressure-bearing capacity of the corrugated tube. The bellows geometry of this embodiment is helical.
3) A sealing gasket 3 is inserted between the upper end 21 and the lower end 22 of the afterloading pre-stressed bellows.
4) Bolts in the bolt assembly 4 are passed through the bolt holes provided in the upper end head 21 and the lower end head 22, and nuts in the bolt assembly 4 are tightened.
The width and wall thickness of the horizontal section of the end head determine the strength and rigidity of the bolt straight anchoring area and determine the effectiveness of bolt connection. In this embodiment, the width w of the upper end 21 and the lower end 22 is 50mm, and the wall thickness h of the upper end 21 and the lower end 22 is 2.5 mm.
5) And foam rubber plugs 6 are coated at two ends of the post-loading prestressed corrugated pipe body 1, so that concrete is prevented from permeating into the inner cavity of the post-loading prestressed corrugated pipe body 1 when concrete is poured on the periphery of the post-loading prestressed corrugated pipe in the subsequent process.
6) And pouring concrete on the periphery of the after-loading prestressed corrugated pipe, then tensioning the prestressed reinforcement, and finally grouting in the inner cavity of the corrugated pipe body 1.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A method for constructing a post-loading prestressed corrugated pipe of a concrete beam bridge cast-in-place closure section is characterized by comprising the following implementation steps:
1) mounting prestressed reinforcement bars on the closure segments;
2) sleeving a post-installed prestressed corrugated pipe on the periphery of the prestressed steel bars, completely wrapping the prestressed steel bars into the inner cavity of the corrugated pipe body (1), positioning and installing two ends of the corrugated pipe body (1) on the cantilever section pre-embedded corrugated pipe (5), and fastening;
3) a sealing gasket (3) is plugged between an upper end head (21) and a lower end head (22) of the after-loading prestressed corrugated pipe;
4) bolts in the bolt assembly (4) penetrate through bolt holes formed in the upper end head (21) and the lower end head (22), and nuts in the bolt assembly (4) are screwed;
5) coating foam rubber plugs (6) on two ends of the afterloading prestressed corrugated pipe body (1);
6) and pouring concrete at the periphery of the after-loading prestressed corrugated pipe, then tensioning the prestressed reinforcement, and finally grouting in the inner cavity of the corrugated pipe body (1).
2. The method for constructing an after-loading prestressed corrugated pipe of a cast-in-place closure section of a concrete girder bridge according to claim 1, wherein: the afterloading prestressed corrugated pipe comprises a corrugated pipe body (1) used for sleeving prestressed reinforcements, the prestressed reinforcements are in clearance fit with the corrugated pipe body (1), an axial opening is formed in the pipe wall of the corrugated pipe body (1) and penetrates through the axial pipe wall of the corrugated pipe body (1), the upper side and the lower side of the axial opening extend along the radial direction to form an upper end head (21) and a lower end head (22) which are symmetrical up and down, a sealing gasket (3) matched with the upper end head (21) and the lower end head (22) is arranged between the upper end head (21) and the lower end head (22), and the upper end head (21) and the lower end head (22) are connected through a bolt assembly (4), so that a sealing structure is formed in the inner cavity of the corrugated pipe body (1).
3. The method for constructing an after-loading prestressed corrugated pipe of a cast-in-place closure section of a concrete girder bridge according to claim 2, wherein: the corrugated pipe body (1), the upper end head (21) and the lower end head (22) are of an integral structure and are formed by one-time extrusion of high-density polyethylene materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110419537.1A CN113123245A (en) | 2021-04-19 | 2021-04-19 | Method for constructing post-installation prestressed corrugated pipe of concrete beam bridge cast-in-place closure section |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110419537.1A CN113123245A (en) | 2021-04-19 | 2021-04-19 | Method for constructing post-installation prestressed corrugated pipe of concrete beam bridge cast-in-place closure section |
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| Publication Number | Publication Date |
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| CN113123245A true CN113123245A (en) | 2021-07-16 |
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| CN202110419537.1A Pending CN113123245A (en) | 2021-04-19 | 2021-04-19 | Method for constructing post-installation prestressed corrugated pipe of concrete beam bridge cast-in-place closure section |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202444216U (en) * | 2012-02-23 | 2012-09-19 | 中联重科股份有限公司 | Corrugated pipe |
| JP2014098288A (en) * | 2012-11-15 | 2014-05-29 | Totaku Industries Inc | Sheath for PC steel |
| CN104377621A (en) * | 2014-11-07 | 2015-02-25 | 常州耐之力刀具制造有限公司 | Novel corrugated pipe |
| CN107611868A (en) * | 2017-09-27 | 2018-01-19 | 国网山西省电力公司检修分公司 | Fast demountable type cable protective sleeve |
| CN111088759A (en) * | 2019-12-24 | 2020-05-01 | 中交二航局第四工程有限公司 | Construction method for steel strand of side span closure section of cast-in-place beam cast by cantilever |
-
2021
- 2021-04-19 CN CN202110419537.1A patent/CN113123245A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202444216U (en) * | 2012-02-23 | 2012-09-19 | 中联重科股份有限公司 | Corrugated pipe |
| JP2014098288A (en) * | 2012-11-15 | 2014-05-29 | Totaku Industries Inc | Sheath for PC steel |
| CN104377621A (en) * | 2014-11-07 | 2015-02-25 | 常州耐之力刀具制造有限公司 | Novel corrugated pipe |
| CN107611868A (en) * | 2017-09-27 | 2018-01-19 | 国网山西省电力公司检修分公司 | Fast demountable type cable protective sleeve |
| CN111088759A (en) * | 2019-12-24 | 2020-05-01 | 中交二航局第四工程有限公司 | Construction method for steel strand of side span closure section of cast-in-place beam cast by cantilever |
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Application publication date: 20210716 |
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