CN108253223B - Annular prestressing force repair reinforcing system in pipe - Google Patents
Annular prestressing force repair reinforcing system in pipe Download PDFInfo
- Publication number
- CN108253223B CN108253223B CN201810149090.9A CN201810149090A CN108253223B CN 108253223 B CN108253223 B CN 108253223B CN 201810149090 A CN201810149090 A CN 201810149090A CN 108253223 B CN108253223 B CN 108253223B
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- disc
- loading
- pipe
- prestress
- reinforcing system
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/18—Appliances for use in repairing pipes
Abstract
The invention relates to a repairing and reinforcing system for annular prestress in a pipe, which comprises a mounting disc, a loading disc, a penetrating jack, a wedge-shaped loading body connected with the jack and an equipment platform. The system for repairing and reinforcing the prestress in the pipe can effectively improve or strengthen the capacity of bearing internal water pressure, air pressure and external negative pressure of a common concrete pipe, a prestress steel cylinder concrete pipe (PCCP pipe), a circumferential tubular structure (masonry and composite material body) and a polygonal cavity structure, improves the functions of structural integrity, durability and the like, fully utilizes the tensile mechanical properties of high-strength materials such as carbon fibers and the like, initiates a method for prestress in the pipe, realizes the application of the method, increases the application range of the combination of all accessories, and improves the economical efficiency, the technical efficiency and the high efficiency.
Description
Technical Field
The invention relates to an annular prestress repairing and reinforcing system in a pipe, which belongs to the technical field of annular prestress, such as common concrete pipe inner reinforcement, PCCP pipe inner reinforcement, steel pipe inner reinforcement, glass fiber reinforced plastic pipe inner reinforcement, annular building in the room, annular pool inner wall and the like, and can better exert the performances of high-strength materials and high-strength structural adhesive in the PCCP pipe at present and solve the problem of non-excavation type inner pipe reinforcement.
Background
PCCP is a short name of prestressed steel cylinder concrete pipe (PrestressedConcrete Cylinder Pipe), it refers to a kind of compound pipe made up of steel cylinder with bell and spigot steel ring at both ends and concrete layer at both sides of steel cylinder, and twine the high strength steel wire of prestressing force at the outer wall of the pipe core, then roll-shoot the cement mortar protective layer.
The water delivery engineering is a big artery for urban life, plays an important role in national economic development, and once a pipe explosion accident occurs in the PCCP water delivery pipeline, the economic loss is serious and the social influence is bad. The application of PCCP pipes in projects in China starts from 90 th century, the Beijing section of the south-to-north water transfer project in 12 th year 2005 pulls open the prologue of the application of large-diameter PCCPs in China, PCCP pipes are more and more widely applied in the domestic large-scale water transfer project due to the excellent characteristics, however, along with the gradual popularization of PCCPs, a plurality of PCCP pipes are approaching or reaching the destruction years. Recent tests also show that a large number of domestic PCCP pipelines have steel wire breakage, and the number of broken wires tends to increase year by year. The occurrence of the broken wire phenomenon has larger influence on the normal use limit state, the probability of burst water-stopping accidents is greatly increased, and especially when the broken wire range is larger, under the comprehensive actions of prestress, pipe body dead weight, soil pressure, fluid dead weight and the like, the bearing capacity is lost, the designed internal water pressure cannot be continuously born, and the burst pipe accidents are extremely easy to occur under the action of the internal water pressure. Therefore, how to repair and reinforce the PCCP pipe effectively is a very important and urgent task.
The existing repairing method mainly comprises a pipe external reinforcing method, a pipe replacement method, a conventional reinforcing method in a pipe and the like.
The external pipe reinforcement method has the defects that a large amount of earthwork needs to be excavated, and although the carbon fiber cloth is stuck outside the pipe, the circumferential constraint can be effectively provided, the reinforcement can be accurately carried out on the broken wire position, the manufacturing cost is high, the engineering quantity is large, and the method is not suitable for large-scale popularization in engineering practice.
The pipe changing method is to find out the position of the damaged pipe through flaw detection, then dig out the upper soil layer, then remove the damaged pipe and change the new PCCP pipe. The method has the advantages that the influence is large, the construction can be performed only when the water delivery is stopped, and the removal of the pipeline is difficult to construct. Treatment of joints is also a construction challenge to be solved. This method cannot be a universally applicable method.
The method for reinforcing the inside of the pipe usually adopts a non-prestress reinforcing method, and the method usually adopts a method for directly pasting carbon fiber cloth for reinforcing, because the elastic mold of the carbon fiber material is similar to a steel bar, the tensile strength is about 7-10 times of that of the steel bar, the high strength needs to be greatly deformed when the high strength is exerted, and the high strength characteristic of the carbon fiber material is difficult to fully utilize by internal pasting. The method belongs to non-active stress, namely, the method can only play a role under the condition of external load, and cannot actively play the role of the carbon fiber material, so that the waste of the performance of the carbon fiber material is caused to a certain extent.
Disclosure of Invention
The invention aims to solve the technical problems that: the defect of the prior art is overcome, and a repairing and reinforcing system capable of actively loading prestress in a pipe is provided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: an intraductal prestressing force repair reinforcement system for apply hoop prestressing force for high-strength materials such as carbon fiber board, paste in the intraductal wall to improve the structure and bear intraductal atmospheric pressure, water pressure or outside the pipe negative pressure ability, reinforcing structure wholeness, durability simultaneously, its characterized in that includes: the device comprises a prestress loading device, a penetrating jack and an equipment platform; the center-penetrating type jack is arranged on the equipment platform, and a loading cone is arranged at the end part of the center-penetrating type jack extending out along the central axis direction of the pipe; the prestress loading device comprises a mounting plate, a loading plate and a loading cone connected with the jack, and the mounting plate, the loading plate and the loading cone form an internal force balance system; the mounting plate is fixedly connected with the equipment platform and plays a role in fixing and adjusting the space geometric position of the loading device; the mounting disc and the loading disc belong to coaxial lines, the loading disc takes the mounting disc as a mounting frame, a guide frame and a loading reaction frame, the diameter of the mounting disc is smaller than that of the loading disc, and a rubber sleeve or other low-elastic-modulus high-strength materials are sleeved outside the loading disc; the loading disc is formed by splicing a plurality of sector discs into a circle, and a hollow part is formed around the circle center of the loading disc; teeth which can be mutually inserted are arranged on two sides of the arc-shaped end of the fan-shaped disc, so that the circumference is still closed after the prestress is loaded; the mounting plate is provided with a plurality of limiting blocks, the fan-shaped plate is provided with strip-shaped holes extending along the radial direction of the fan surface of the fan-shaped plate, and the limiting blocks are corresponding to each other, namely, the limiting blocks penetrate through the strip-shaped holes to axially fix the fan-shaped plate and the mounting plate and limit the fan-shaped plate along the radial direction; the loading cone is provided with conical surfaces corresponding to all sector plates of the loading plate one by one, the conical surfaces of the loading cone are provided with tenons, and the sector plates are provided with mortises matched with the tenons; the loading cone is connected with each sector plate of the loading plate through the matching of the tenons and the mortises, and in use, when the center-penetrating jack drives the loading cone to extrude with each sector plate of the loading plate to generate axial sliding, and meanwhile, the loading cone pushes the sector plates to move outwards from the circle center along the radial direction, so that the annular material is stressed by internal force (tensile stress) after radial pressure is applied to the annular high-strength material; after the circumferential material is stressed and closely attached to the inner wall of the pipe, the structural adhesive coated on the surface of the high-strength material and the inner wall of the pipe is cured in advance, and the circumferential prestress application purpose of the inner wall of the pipe is achieved after the curing; when the through jack drives the loading cone extrusion force to reduce unloading, the sector disc moves inwards from the circle center along the radial direction to reset, the annular high-strength material is adhered to the inner wall of the pipe, the radial pressure borne by the loading disc is borne by structural adhesive between the high-strength material and the inner wall of the pipe, and finally, the annular prestress application of the inner wall of the pipe is realized.
The scheme is further improved as follows: when moderate intraductal hoop prestressing force repair reinforcement system of slope, its characterized in that: the bottom of the equipment platform is also provided with travelling wheels; when the gradient is larger or the pipe is close to the vertical, the circular prestress repairing and reinforcing system is characterized in that: the equipment platform may be replaced by a suspension system.
The scheme is further improved as follows: the limiting block is installed on the installation plate through a bolt.
The scheme is further improved as follows: the loading disc is set to be a basic loading disc and a plurality of detachable fan-shaped annular frames for adapting to pipes with different diameters; the detachable fan-shaped frames are spliced into a ring shape, and the detachable frames are arranged on the fan-shaped disc of the foundation loading disc through bolts; rubber sleeves or other low-elastic-modulus high-strength materials are arranged on the periphery of the outermost sector frame.
The scheme is further improved as follows: the fan-shaped disc and the detachable frame are provided with a plurality of hollowed holes.
The scheme is further improved as follows: the fan-shaped disc and the detachable frame are of a hollow frame structure.
The scheme is further improved as follows: the two ends of the detachable frame are provided with bolt holes; the fastening bolts installed through the bolt holes can fix the shape of the ring spliced by the detachable frame, and the fastening bolts are used for the structural adhesive between the annular high-strength material and the inner wall of the pipe, and the foundation loading disc can be withdrawn from working.
The scheme is further improved as follows: the rubber sleeve of the outer ring of the loading disc or the high-strength material of the low elastic modulus, and enough thickness and compression deformation can meet the requirement of reducing the prestress loss generated by the withdrawal of the basic loading disc in 7.
The scheme is further improved as follows: after the prestress in the high-strength material, such as a carbon fiber plate pipe, is reinforced, the wear-resistant protection material is stuck outside the high-strength material, so that the durability and the safety of the reinforcing system are improved.
The scheme is further improved as follows: the outermost ring of the loading disc is polygonal with a chamfer, and is suitable for the working condition that the section of the inner wall of the tube is polygonal with a chamfer or the working condition that the section of the inner wall of the tube is polygonal and is processed into the working condition with the chamfer.
The invention provides an annular prestress repairing and reinforcing system in a pipe, which adopts high-strength materials such as carbon fiber plates and the like to replace traditional metal materials; the prestress is applied to high-strength materials such as carbon fiber plates and the like in a hydraulic expansion mode, so that the purposes of active reinforcement, such as preventing concrete cracking, balancing water pressure and repairing damaged PCCP pipes, are achieved; compared with the existing various construction modes, the invention can more effectively recover the bearing capacity of the PCCP structure, reduce the material consumption, reduce the construction amount, reduce the construction time and improve the output and input ratio.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of the structure of a preferred embodiment 1 of the present invention.
Fig. 2 is a schematic view of the loading tray of fig. 1.
Fig. 3 is a schematic view of the loading cone structure of fig. 1.
Fig. 4 is a schematic view showing the construction of a loading tray according to a preferred embodiment 2 of the present invention.
Fig. 5 is a schematic view of a partial structure of the loading plate of fig. 4 after expansion.
Description of the embodiments
Examples
The system for repairing and reinforcing the annular prestress in the pipe according to the embodiment, as shown in fig. 1, comprises: the device comprises a mounting plate 4, a loading plate 5, a penetrating jack 3 and an equipment platform 2; the fixed shell of the penetrating jack 3 is provided with a disc surface which is arranged on the equipment platform 2; the bottom of the equipment platform 2 is also provided with travelling wheels. The end of the penetrating jack 3 extending in the horizontal direction is provided with a loading cone 6.
As in fig. 2, the mounting plate 4 is smaller in diameter than the loading plate 5; the loading disc 5 is formed by splicing 6 sector discs into a cake shape, and the circle center of the loading disc is provided with a vacant part; teeth which can be mutually inserted are arranged on two sides of the arc-shaped end of the fan-shaped disc; a plurality of limiting blocks 9 are arranged on the mounting plate 4 through bolts, and strip-shaped holes extending along the radial direction are formed in the fan-shaped plate; the limiting block 9 penetrates through the strip-shaped hole and axially fixes the sector disc on the mounting disc 4; the hollow part is provided with a loading cone 6.
As shown in fig. 3, the loading cone 6 has six conical surfaces (3 or more) corresponding to the six sector plates one by one; the conical surface is provided with a dovetail 10, one end of the fan-shaped disc facing the circle center is provided with a groove matched with the dovetail 10, so that the loading cone 6 can enter and leave the gap by moving the loading cone 6 back and forth along the axial direction of the loading disc 5, the conical surface is used for generating radial component force, and the dovetail 10 and the groove are matched so as to generate radial component force in opposite directions when entering and leaving the gap; when the loading cone 6 enters the empty part, the loading cone 6 can push the sector disc to move outwards along the radial direction; when leaving the recess, the segment disc is pulled to move inwards in the radial direction. In this embodiment, a dovetail is used, and other shapes, such as a T-shape, can also perform this function.
The mounting plate 4 is fixedly connected with the center-penetrating jack 3 through bolts; in order to buffer stress concentration at tooth-shaped connection parts between the sectors in the loading process, so that the loading force is more uniform, a rubber sleeve 7 is sleeved outside the loading disc 5. The length of the strip-shaped holes is also shorter because of the smaller expansion size required for the carbon fiber plate 8.
During construction, the components, materials, tools and the like are firstly put into operationConveying the construction PCCP1 into the construction PCCP1 and assembling; the carbon fiber plate 8 is cylindrical (annular) with an initial diameter D 0 The specific value of the internal diameter D which is slightly smaller than the internal diameter D of the PCCP1 is obtained according to the target circumferential prestress sigma of the carbon fiber plate. Elongation of carbon fiber board isThe target circumferential prestress of the carbon fiber plate is sigma=Eε=E/>In the followingEThe initial diameter of the carbon fiber plate is D 0 = D-σD/E. The determination of the target hoop prestress of the carbon fiber plate is related to the PCCP radial internal water pressure to be shared and the strength of the adhesive. Polishing the bonding part of PCCP1 according to the design requirement until the concrete surface is exposed; mixing the adhesive glue according to the proportion, and uniformly stirring; smearing base adhesive on the bonding part of the inner wall of the polished prestressed steel cylinder concrete pipe; the carbon fiber plate 8 is sleeved outside the rubber sleeve 7, the surface of the carbon fiber plate 8 is wiped clean, the adhesive is immediately coated, the adhesive layer is in a convex shape, and the average thickness is more than 2mm.
Then starting the penetrating jack 3 and pulling the loading cone 6; the loading cone 6 pushes the sector disc to move outwards, so that the loading disc 5 expands, the carbon fiber plate 8 coated with the adhesive is pressed against the polished concrete surface, the adhesive is extruded from two sides, and the inner compactness and no cavity are ensured; and removing redundant adhesive on two sides. If a plurality of carbon fiber plates are adhered in parallel, the gap between two strip plates should not be less than 5mm.
Thus, the carbon fiber plate 8 can be stretched to generate a circumferential pulling force; the tangential force along the adhesive interface is transmitted through adhesive force, so that the pre-pressurizing stress of the concrete pipeline is realized; along with solidification of the adhesive, the carbon fiber plate 8 is fixed on the inner surface of the PCCP1, and the prestress loading is completed; and then the repairing and reinforcing system of the stress steel cylinder concrete pipe of the embodiment is removed.
Examples
This example was modified from example 1, and is largely the same as example 1, except that fig. 4 shows: a plurality of fan-shaped annular detachable frames 11 are arranged between the fan-shaped disc and the rubber sleeve; the detachable frame 11 is spliced into a ring shape, and the detachable frame 11 is arranged on the sector plate through bolts. In order to reduce the weight of the loading disc 5, the detachable frame 11 is provided with a plurality of hollowed weight reducing holes; the fan-shaped disc can adopt a hollowed weight-reducing hole design on the premise of ensuring the required rigidity, and can also adopt a hollow frame structure.
The two ends of the detachable frame 11 are provided with bolt holes; the fastening bolts fitted through the bolt holes can fix the shape of the ring spliced by the detachable frame 11.
The construction procedure was largely the same as in example 1, except for the following:
starting the penetrating jack 3 and pulling the loading cone 6; the loading cone 6 pushes the sector disc to move outwards, so that the loading disc 5 expands; thereafter, as shown in fig. 5, the detachable frames 11 are fixed to each other by using bolts 12, so that the ring formed by the detachable frames 11 can maintain its own shape, and thus the expansion force can be continuously applied to the carbon fiber plates 8 in a state where the thrust force is not applied by the loading cone 6; thus, the loading cone 6 can be released, the fan-shaped disc is reset under the action of the loading cone and the dovetail, and then the rest parts are removed, so that only the detachable frame 11 is left, the PCCP1 is prevented from being blocked, the movement of personnel, equipment, materials and the like in the pipe is facilitated, meanwhile, the rest parts can be moved to the next position, the operation time can be saved, the operation efficiency is improved, and the equipment cost can be reduced through the other set of detachable frame 11 for the secondary operation.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be provided in addition to the above embodiments. All technical schemes formed by adopting equivalent substitution are the protection scope of the invention.
Claims (8)
1. An in-pipe hoop prestressing repair reinforcing system for applying hoop prestressing to a carbon fiber plate adhered to an inner wall of a pipe, comprising: the device comprises a prestress loading device, a penetrating jack and an equipment platform; the center-through jack is arranged on the equipment platform; the prestress loading device comprises a mounting disc, a loading disc and a loading cone, wherein the loading cone is provided with an end part of the through jack extending out along the central axis direction of the pipe; the mounting disc is fixedly connected with the equipment platform, the mounting disc and the loading disc are coaxial, the diameter of the mounting disc is smaller than that of the loading disc, and a rubber sleeve is sleeved outside the loading disc; the loading disc is formed by splicing a plurality of sector discs into a circle, and a hollow part is formed around the circle center of the loading disc; teeth capable of being mutually inserted are arranged at two ends of the cambered surface of the fan-shaped disc, a plurality of limiting blocks are arranged on the mounting disc, strip-shaped holes extending along the radial direction of the fan-shaped disc are formed in the fan-shaped disc, and the limiting blocks penetrate through the strip-shaped holes to axially fix the fan-shaped disc and the mounting disc; the loading cone is provided with conical surfaces corresponding to all sector plates of the loading plate one by one, the conical surfaces of the loading cone are provided with tenons, and the sector plates are provided with mortises matched with the tenons; during use, when the through jack drives the loading cone to slide on one side in the axial direction, the loading cone pushes the sector disc to move outwards along the radial direction from the circle center, and when the through jack drives the loading cone to slide on the other side in the axial direction, the sector disc moves inwards along the radial direction from the circle center.
2. The in-pipe hoop pre-stress repair reinforcing system according to claim 1, wherein: the bottom of the equipment platform is also provided with a travelling wheel or a suspension system.
3. The in-pipe hoop pre-stress repair reinforcing system according to claim 1, wherein: the limiting block is installed on the installation plate through a bolt.
4. The in-pipe hoop pre-stress repair reinforcing system according to claim 1, wherein: an annular or polygonal outer frame with a chamfer angle is also arranged between the loading disc and the rubber sleeve; the outer frame consists of a plurality of detachable frames; the detachable frame is mounted on the loading disc through bolts.
5. The in-pipe hoop pre-stress repair reinforcing system according to claim 4, wherein: the fan-shaped disc and the detachable frame are provided with a plurality of hollowed holes.
6. The in-pipe hoop pre-stress repair reinforcing system according to claim 4, wherein: the fan-shaped disc and the detachable frame are of a hollow frame structure.
7. The in-pipe hoop pre-stress repair reinforcing system according to claim 4, wherein: the two ends of the detachable frame are provided with bolt holes; the fastening bolts installed through the bolt holes can fix the shape of the ring spliced by the detachable frame, and the fastening bolts are used for the structural adhesive between the annular high-strength material and the inner wall of the pipe, and the foundation loading disc can be withdrawn from working.
8. The in-pipe hoop pre-stress repair reinforcing system according to claim 4, wherein: the rubber sleeve is made of a low-elastic-modulus high-strength material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810149090.9A CN108253223B (en) | 2018-02-13 | 2018-02-13 | Annular prestressing force repair reinforcing system in pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810149090.9A CN108253223B (en) | 2018-02-13 | 2018-02-13 | Annular prestressing force repair reinforcing system in pipe |
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| Publication Number | Publication Date |
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| CN108253223A CN108253223A (en) | 2018-07-06 |
| CN108253223B true CN108253223B (en) | 2023-10-03 |
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| CN201810149090.9A Active CN108253223B (en) | 2018-02-13 | 2018-02-13 | Annular prestressing force repair reinforcing system in pipe |
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| CN208058252U (en) * | 2018-02-13 | 2018-11-06 | 水利部交通运输部国家能源局南京水利科学研究院 | Ring orientation prestress repairing and reinforcing system in a kind of pipe |
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| US2312993A (en) * | 1938-08-10 | 1943-03-02 | Gustin Bacon Mfg Co | Method of lining pipe |
| GB1416947A (en) * | 1972-10-18 | 1975-12-10 | Takata Kojyo Co | Method and apparatus for lining a pipe |
| GB2018384A (en) * | 1978-04-05 | 1979-10-17 | Cahuzac D | Sheath for forming an internal lining for a conduit and a process for using the sheath |
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| CN108253223A (en) | 2018-07-06 |
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