CN112049027A - Remediation method for prestressed duct - Google Patents
Remediation method for prestressed duct Download PDFInfo
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- CN112049027A CN112049027A CN202010925551.4A CN202010925551A CN112049027A CN 112049027 A CN112049027 A CN 112049027A CN 202010925551 A CN202010925551 A CN 202010925551A CN 112049027 A CN112049027 A CN 112049027A
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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
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling 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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension 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
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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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
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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
- E01D2101/30—Metal
Abstract
The invention provides a remediation method of a prestressed duct, which comprises the following steps: providing a main bridge cable, wherein the main bridge cable comprises a first steel sleeve box and a plurality of first lining pipes, the first lining pipes are positioned in the first steel sleeve box, and concrete is filled between the first lining pipes and the first steel sleeve box; dividing the bridge main cable into a normal section and a deformation section according to the deformation condition of the first lining pipe; cutting off the deformation section; and installing a remedying section at the cut deformed section and connecting the remedying section and the normal section. Through cutting out the deformation section of bridge main push-towing rope and direct replacement for the section of remedying, avoided replacing whole bridge main push-towing rope, solved and abandoned and the time limit for a project and the cost problem that the reconstruction brought whole bridge main push-towing rope, can greatly reduce the construction loss, guarantee the construction quality of bridge main push-towing rope.
Description
Technical Field
The invention relates to the technical field of suspension bridge construction, in particular to a remediation method for a prestressed duct.
Background
In bridge engineering construction, a continuous beam bridge with a large span is often required to be prestressed and tensioned. For example, a suspension bridge main cable is composed of a plurality of high-strength low-relaxation steel stranded wires according to rise ratio and stress requirements. The middle span cable and the side span cable of the main cable of the suspension bridge are both tensioned at two ends, and the tensioning ends are respectively arranged at the top of the tower and the bottom of the beam.
When a main cable of a suspension bridge is manufactured, a plurality of plastic corrugated pipes are usually required to be placed in a steel sleeve box so as to form a prestressed duct for penetrating a stranded steel wire after concrete is poured. However, in the actual construction process, when the curvature radius of the main cable is too large, the deformation condition of the corrugated pipe is found to be serious through the on-site inspection of the pipeline endoscope equipment, so that the steel strand cannot be smoothly threaded. The analysis can be caused by the following three reasons: firstly, the main cable steel sleeve box is of a closed structure, the concrete hydration heat is overlarge, the internal temperature is high, and the plastic corrugated pipe is easily influenced by the temperature and is easily deformed; secondly, extruding the prestressed duct by the self weight of the concrete and the pressure of a fixed pump; thirdly, filling concrete in the main cable is self-compacting micro-expansion concrete;
at present, the main cable is mostly abandoned in a whole root and is constructed again in the industry aiming at the condition, but the construction quality and the construction period are difficult to guarantee by the method.
Disclosure of Invention
The invention aims to provide a method for remedying a prestressed duct, which solves the problems of construction period and cost caused by abandonment and reconstruction of a whole bridge main cable, can greatly reduce construction loss and ensure the construction quality of the bridge main cable.
In order to achieve the above object, the present invention provides a method for repairing a prestressed duct, comprising:
providing a main bridge cable, wherein the main bridge cable comprises a first steel sleeve box and a plurality of first lining pipes, the first lining pipes are positioned in the first steel sleeve box, and concrete is filled between the first lining pipes and the first steel sleeve box;
dividing the bridge main cable into a normal section and a deformation section according to the deformation condition of the first lining pipe;
cutting off the deformation section;
and installing a remedying section at the cut deformed section and connecting the remedying section and the normal section.
Optionally, the step of installing a repair segment at the cut-off deformation segment and connecting the repair segment and the normal segment specifically includes:
providing a second steel pouring jacket, wherein the second steel pouring jacket is of a semi-closed structure and is provided with an opening at the top;
installing a plurality of second lining pipes in the second steel sleeve box;
connecting the first steel sleeve box and the second steel sleeve box, connecting the first lining pipe and the second lining pipe, and enabling the first lining pipe and the second lining pipe to be communicated with each other;
penetrating and bundling steel strands into the first lining pipe and the second lining pipe;
and welding a top plate at the top of the second steel sleeve box to seal the second steel sleeve box, and filling concrete into the second steel sleeve box.
Optionally, before the first steel jacket box and the second steel jacket box are connected and the first lining pipe and the second lining pipe are connected, the method for remedying the prestressed duct further includes:
and chiseling concrete of a first set length at the connecting end of the normal section.
Optionally, the first lining pipe is a corrugated pipe, the second lining pipe is a steel pipe, and the specific steps of connecting the first lining pipe and the second lining pipe include:
chiseling concrete with a second set length at the periphery of the connecting end of the first lining pipe;
and providing a connecting steel pipe, inserting one end of the connecting steel pipe into the first lining pipe, and connecting the other end of the connecting steel pipe with the second lining pipe through a flange.
Optionally, after filling concrete into the second steel jacket box, the method for remedying the prestressed duct further includes:
and cement mortar is injected around the connecting end of the first lining pipe.
Optionally, the first lining pipe and the second lining pipe are corrugated pipes, and the specific step of connecting the first lining pipe and the second lining pipe includes:
and providing a connecting steel pipe, splicing two ends of the connecting steel pipe with the first lining pipe and the second lining pipe respectively, sleeving a sleeve at the splicing position, and connecting the sleeve with the first lining pipe and the second lining pipe through a transparent adhesive tape.
Optionally, a fixed pump is used for filling concrete into the second steel jacket box, and the pressure of the fixed pump is controlled to be not more than 2 mpa.
Optionally, before the deforming segment is cut, the method for remedying the prestressed duct further includes:
and temporary supports are arranged below the normal section and the deformation section.
Optionally, the step of cutting the deformed segment specifically includes:
forming a circumferential notch at a set position on the first steel jacket box by adopting an air gouging process;
and cutting the concrete in the first steel pouring jacket along the annular notch by using a diamond wire saw.
Optionally, before installing the repairing section at the cut-off deformation section, the repairing method of the prestressed duct further includes:
and dredging the first lining pipe.
The invention provides a remediation method of a prestressed duct, which comprises the following steps: providing a main bridge cable, wherein the main bridge cable comprises a first steel sleeve box and a plurality of first lining pipes, the first lining pipes are positioned in the first steel sleeve box, and concrete is filled between the first lining pipes and the first steel sleeve box; dividing the bridge main cable into a normal section and a deformation section according to the deformation condition of the first lining pipe; cutting off the deformation section; and installing a remedying section at the cut deformed section and connecting the remedying section and the normal section. Through cutting out the deformation section of bridge main push-towing rope and direct replacement for the section of remedying, avoided replacing whole bridge main push-towing rope, solved and abandoned and the time limit for a project and the cost problem that the reconstruction brought whole bridge main push-towing rope, can greatly reduce the construction loss, guarantee the construction quality of bridge main push-towing rope.
Drawings
FIG. 1 is a step diagram of a method for repairing a pre-stressed duct according to an embodiment of the present invention;
FIGS. 2-3 are schematic views of a first embodiment of the present invention for cutting out the deformed section;
FIG. 4 is a schematic view of the connection between the first lining pipe and the second lining pipe according to one embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a second steel jacket box according to a first embodiment of the present invention;
FIG. 6 is a schematic view of the connection between the first and second inner liner pipes according to the second embodiment of the present invention;
wherein the reference numerals are:
10-a first steel jacket box; 20-a first liner tube; 30-normal section; 40-a deformation section; 50-tower top; 51-beam bottom; 52-temporary support; 60-a second steel jacket box; 70-a second liner tube; 80-connecting steel pipes; 90-casing.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
Referring to fig. 1 in combination with fig. 2 to 4, the present embodiment provides a method for repairing a prestressed duct, including:
step S1: providing a main bridge cable, wherein the main bridge cable comprises a first steel pouring jacket 10 and a plurality of first lining pipes 20, the first lining pipes 20 are positioned in the first steel pouring jacket 10, and concrete is filled between the first lining pipes 20 and the first steel pouring jacket 10;
step S2: dividing the bridge main cable into a normal section 30 and a deformed section 40 according to the deformation condition of the first lining pipe 20;
step S3: cutting off the deformation segment 40;
step S4: a repair section is installed at the removed deformation section 40 and the repair section and the normal section 30 are connected.
Specifically, step S1 is executed first, and a main bridge cable is provided, where the main bridge cable includes a first steel casing 10 and a plurality of first lining pipes 20, the first lining pipes 20 are located in the first steel casing 10, and concrete is filled between the first lining pipes 20 and the first steel casing 10. In this embodiment, the cross section of the first steel jacket box 10 is a box-shaped cross section, the first lining pipe 20 is generally a flexible pipe, such as a plastic corrugated pipe, and the curvature radius of the main cable of the bridge is large, so that the first lining pipe 20 is seriously deformed and cannot be smoothly pulled out. In this embodiment, the concrete is C60 self-compacting micro-expansion concrete.
Then, step S2 is performed to divide the main bridge cable into a normal section 30 and a deformed section 40 according to the deformation of the first lining pipe 20. In this embodiment, both ends of the main bridge cable are respectively tensioned to the tower top 50 and the beam bottom 51, the deformation section 40 is generally located at a portion of the main bridge cable close to the beam bottom 51, and the first lining pipe 20 in the main bridge cable can be detected by a pipeline endoscope apparatus to mark the area of the deformation section 40. In this embodiment, the deformation section 40 mainly determines whether the mining pilot bit can pass through smoothly, and if the mining pilot bit cannot pass through, the steel strand cannot be threaded smoothly.
After the step S2 is completed, before the step S3 is performed, the method for repairing the prestressed duct further includes: a temporary support 52 is provided below the normal section 30. Since the deformed section 40 of the main bridge cable needs to be cut, a temporary support 52 needs to be provided below the deformed section 40 and the normal section 30 to prevent the normal section 30 and the deformed section 40 from falling.
Then, step S3 is performed to cut the deformed segment 40. In this embodiment, the step of cutting off the deformed segment 40 specifically includes:
forming a circumferential notch at a set position on the first steel pouring jacket 10 by adopting an air gouging process;
the concrete inside the first steel casing 10 is cut along the circumferential cut with a diamond wire saw.
The planing surface of the air plane is smooth, the welding quality during subsequent welding is improved, and the construction cost is low.
It should be understood that when the length of the deformed section 40 is long, it can be seen that the deformed section 40 is cut out in multiple sections to facilitate handling. In the embodiment, a truck crane is adopted for hoisting, and the hoisting capacity of the truck crane is selected according to the bearing condition of the bridge.
After the step S3 is completed, before the step S4 is performed, the method for repairing the prestressed duct further includes: the first liner tube 20 is dredged. In this embodiment, the first lining pipe 20 is dredged by drilling along the axial direction with a GXY-10 mining guide drilling machine, and is cleaned with a high-pressure air pump. And the drilling direction is strictly controlled in the hole cleaning process, the whole pipeline is detected again by using the endoscope after the hole cleaning is finished, and if the hole cleaning end part and the old hole are greatly dislocated, the whole pipeline is corrected again.
Finally, step S4 is executed to install a repair segment at the removed deformation segment 40 and connect the repair segment and the normal segment 30. Through with the direct replacement of deformation section 40 for the section of remedying, solved and abandoned and the time limit for a project and the cost problem that the reconstruction brought whole bridge main push-towing rope, can greatly reduce the construction loss, guarantee the construction quality of bridge main push-towing rope.
Specifically, with reference to fig. 4, the step S4 includes:
s41: providing a second steel pouring jacket 60, wherein the second steel pouring jacket 60 is of a semi-closed structure and is provided with an opening at the top;
s42: installing a plurality of second liner tubes 70 in the second steel jacket 60;
s43: connecting the first steel jacket box 10 and the second steel jacket box 60, and connecting the first lining pipe 20 and the second lining pipe 70, and making the first lining pipe 20 and the second lining pipe 70 mutually communicated;
s44: threading steel strands into the first lining pipe 20 and the second lining pipe 70;
s45: a top plate is welded to the top of the second steel jacket box 60 to seal the second steel jacket box 60, and concrete is filled into the second steel jacket box 60.
After the step S3 is completed, step S41 is performed to provide a second steel jacket 60, wherein the second steel jacket 60 is a semi-closed structure and the top of the second steel jacket 60 has an opening. The second steel jacket box 60 is designed to be a semi-closed structure so as to facilitate installation and connection of the second lining pipe 70 and the strand-penetrating steel strands, thereby ensuring an operation space. In this embodiment, referring to fig. 5, the second steel jacket 60 is a U-shaped member. It will be appreciated that a partial top plate may be welded to a localized area of the second steel jacket 60 to facilitate welding.
Then, execution of S42: a plurality of second liner tubes 70 are installed in the second steel jacket 60. Before installing the second lining pipes 70, main reinforcements and stirrups may be overlapped in the second steel casing box 60 to improve the structural strength and rigidity of the bridge main cable. In this embodiment, the number and distribution of the second liner tubes 70 are not limited.
Before executing step S43, the method for repairing the prestressed duct further includes: a first set length of concrete is chiseled off at the connecting end of the normal section 30. The purpose is to provide enough operating space to ensure that the first lining pipe 20 in the normal section 30 can be connected with the second lining pipe 70 in the remedial section, and to ensure that the concrete construction joint in the second steel casing 60 can be dislocated with the welding joint of the second steel casing 60 and the first steel casing 10, so as to improve the stress state of the whole structure. It should be understood that when concrete is poured into the second steel casing 60, the concrete fills the chiseled portion of the first steel casing 10 of the normal section 30, and the first steel casing 10 and the second steel casing 60 are connected in the welding direction, so that the construction joint of the concrete is spaced from the welding joint, i.e., the concrete is misaligned.
Next, step S43 is performed to connect the first steel jacket tank 10 and the second steel jacket tank 60 and the first lining pipe 20 and the second lining pipe 70, and to pass the first lining pipe 20 and the second lining pipe 70 through each other.
Specifically, referring to fig. 4, the first steel jacket box 10 and the second steel jacket box 60 may be connected into a whole by welding. When the first lining pipe 20 is a corrugated pipe and the second lining pipe 70 is a steel pipe, the specific steps of connecting the first lining pipe 20 and the second lining pipe 70 include:
chiseling concrete of a second set length around the connection end of the first lining pipe 20;
a connecting steel pipe 80 is provided, one end of the connecting steel pipe 80 is inserted into the first lining pipe 20, and the other end is flanged with the second lining pipe 70.
The second liner pipe 70 is made of a steel pipe, and has an advantage in that deformation does not easily occur. First, concrete of a second set length is chiseled at the periphery of the connection end of the first lining pipe 20 so that the steel pipe can be inserted into the first lining pipe 20, thereby providing a certain working space. Meanwhile, the compactness of the mortar is better than that of the concrete, so that the air tightness of the prestressed duct can be improved in a mode of grouting the chiseled area subsequently.
In this embodiment, the first set length may be 300mm, and the second set length may be 100mm, that is, the first set length is greater than the second set length.
The first and second liner pipes 20 and 70 are then connected by a connecting steel pipe 80. In this embodiment, the diameters of the two ends of the connecting steel pipe 80 are different, the end of the connecting steel pipe 80 with the smaller diameter is inserted into the first lining pipe 20, the tightness of the connection between the two is ensured by the flexibility of the first lining pipe 20, the flange is welded to the other end of the connecting steel pipe 80, a matched flange is also welded to the end of the second lining pipe 70, and the connecting steel pipe 80 and the second lining pipe 70 are connected by bolts.
In this embodiment, the first lining pipe 20 and the second lining pipe 70 are used for reserving a pre-stressed duct through which the steel strand is threaded, and the diameter of the first lining pipe 20 is the same as that of the second lining pipe 70, so as to ensure the threading of the steel strand.
Then, execution of S44: and (3) penetrating and bundling steel strands into the first lining pipe 20 and the second lining pipe 70. In the embodiment, the steel strand is pre-threaded before concrete pouring, the steel strand guide cap is installed and fixed before threading, and the steel strand is threaded by an electric threading machine.
Finally, step S45 is executed: a top plate is welded to the top of the second steel jacket box 60 to seal the second steel jacket box 60, and concrete is filled into the second steel jacket box 60. In this embodiment, a fixed pump is used to fill the second steel jacket 60 with concrete, and the pressure of the fixed pump is controlled to be not more than 2 mpa. And after the concrete pouring is finished, carrying out geotextile wrapping, spraying and maintaining on the remediation section in time.
In this embodiment, after the second steel casing 60 is filled with concrete, cement mortar is injected around the connecting end of the first lining pipe 20 to ensure the airtightness of the prestressed duct.
Example two
The only difference from the first embodiment is that in the second embodiment, the first lining pipe 20 and the second lining pipe 70 are corrugated pipes, so the connection manner of the first lining pipe 20 and the second lining pipe 70 is different. The corrugated pipe has the advantages that the corrugated pipe is a flexible pipe and has certain flexibility and elasticity. Specifically, referring to fig. 6, the specific steps of connecting the first and second liner tubes 20 and 70 include: providing a connecting steel pipe 80, splicing two ends of the connecting steel pipe 80 with the first lining pipe 20 and the second lining pipe 70 respectively, sleeving a sleeve 90 at the splicing position, and connecting the sleeve 90 with the first lining pipe 20 and the second lining pipe 70 through a transparent adhesive tape.
In this embodiment, the diameter of the connecting steel pipe 80 is the same as that of the first lining pipe 20 and the second lining pipe 70, the splicing position of the connecting steel pipe 80 and the first lining pipe 20 and the second lining pipe 70 can be connected by sleeving a sleeve 90, and then a transparent adhesive tape is bound to ensure the air tightness of the connection.
To sum up, an embodiment of the present invention provides a method for repairing a prestressed duct, including: providing a main bridge cable, wherein the main bridge cable comprises a first steel sleeve box and a plurality of first lining pipes, the first lining pipes are positioned in the first steel sleeve box, and concrete is filled between the first lining pipes and the first steel sleeve box; dividing the bridge main cable into a normal section and a deformation section according to the deformation condition of the first lining pipe; cutting off the deformation section; and installing a remedying section at the cut deformed section and connecting the remedying section and the normal section. Through cutting out the deformation section of bridge main push-towing rope and direct replacement for the section of remedying, avoided replacing whole bridge main push-towing rope, solved and abandoned and the time limit for a project and the cost problem that the reconstruction brought whole bridge main push-towing rope, can greatly reduce the construction loss, guarantee the construction quality of bridge main push-towing rope.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of remediating a pre-stressed duct, comprising:
providing a main bridge cable, wherein the main bridge cable comprises a first steel sleeve box and a plurality of first lining pipes, the first lining pipes are positioned in the first steel sleeve box, and concrete is filled between the first lining pipes and the first steel sleeve box;
dividing the bridge main cable into a normal section and a deformation section according to the deformation condition of the first lining pipe;
cutting off the deformation section;
and installing a remedying section at the cut deformed section and connecting the remedying section and the normal section.
2. The method for repairing a prestressed duct as claimed in claim 1, wherein the step of installing a repairing section at the removed deformed section and connecting the repairing section and the normal section comprises:
providing a second steel pouring jacket, wherein the second steel pouring jacket is of a semi-closed structure and is provided with an opening at the top;
installing a plurality of second lining pipes in the second steel sleeve box;
connecting the first steel sleeve box and the second steel sleeve box, connecting the first lining pipe and the second lining pipe, and enabling the first lining pipe and the second lining pipe to be communicated with each other;
penetrating and bundling steel strands into the first lining pipe and the second lining pipe;
and welding a top plate at the top of the second steel sleeve box to seal the second steel sleeve box, and filling concrete into the second steel sleeve box.
3. The method of repairing a prestressed duct as claimed in claim 2, wherein before connecting said first steel jacket box and said second steel jacket box and connecting said first lining pipe and said second lining pipe, said method further comprises:
and chiseling concrete of a first set length at the connecting end of the normal section.
4. The method for repairing a prestressed duct as claimed in claim 3, wherein said first lining pipe is a corrugated pipe, said second lining pipe is a steel pipe, and said steps of connecting said first lining pipe and said second lining pipe comprise:
chiseling concrete with a second set length at the periphery of the connecting end of the first lining pipe;
and providing a connecting steel pipe, inserting one end of the connecting steel pipe into the first lining pipe, and connecting the other end of the connecting steel pipe with the second lining pipe through a flange.
5. The method for repairing a prestressed duct as claimed in claim 4, wherein after filling concrete into said second steel casing box, said method for repairing a prestressed duct further comprises:
and cement mortar is injected around the connecting end of the first lining pipe.
6. The method for repairing a prestressed duct as claimed in claim 3, wherein said first and second lining pipes are corrugated pipes, and the step of connecting said first and second lining pipes comprises:
and providing a connecting steel pipe, splicing two ends of the connecting steel pipe with the first lining pipe and the second lining pipe respectively, sleeving a sleeve at the splicing position, and connecting the sleeve with the first lining pipe and the second lining pipe through a transparent adhesive tape.
7. The method for repairing the prestressed duct of claim 2, wherein a fixed pump is used to fill the concrete into the second steel casing box, and the pressure of the fixed pump is controlled to be not more than 2 MPa.
8. The method for repairing a prestressed duct as claimed in claim 1, wherein before said deformation section is cut, said method for repairing a prestressed duct further comprises:
and temporary supports are arranged below the normal section and the deformation section.
9. The method for repairing a prestressed duct as claimed in claim 1, wherein said step of removing said deformation section includes:
forming a circumferential notch at a set position on the first steel jacket box by adopting an air gouging process;
and cutting the concrete in the first steel pouring jacket along the annular notch by using a diamond wire saw.
10. The method for repairing a prestressed duct as claimed in claim 1, wherein before installing the repairing section at the removed deformed section, the method for repairing a prestressed duct further comprises:
and dredging the first lining pipe.
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| CN202010925551.4A CN112049027A (en) | 2020-09-04 | 2020-09-04 | Remediation method for prestressed duct |
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Application publication date: 20201208 |