CN112207091B - Method for cleaning horn mouth of anchor backing plate - Google Patents
Method for cleaning horn mouth of anchor backing plate Download PDFInfo
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- CN112207091B CN112207091B CN202011004439.3A CN202011004439A CN112207091B CN 112207091 B CN112207091 B CN 112207091B CN 202011004439 A CN202011004439 A CN 202011004439A CN 112207091 B CN112207091 B CN 112207091B
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- mortar
- bell mouth
- backing plate
- anchor backing
- anchor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
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Abstract
The invention provides a method for cleaning a bell mouth of an anchor backing plate, which belongs to the technical field of prestress construction and is used for cleaning mortar in the bell mouth of a post-tensioned prestress anchor backing plate, wherein a corrugated pipe extending to the bell mouth is arranged in the anchor backing plate, the mortar is deposited and solidified between the anchor backing plate and the corrugated pipe, and the method comprises the following steps: cutting the corrugated pipe in the bell mouth of the anchor backing plate to expose mortar in the bell mouth; taking out the cut bellows; chiseling the exposed mortar to expose the inner wall of the bell mouth; and cleaning the chiseled mortar. The linear smoothness that the assurance steel strand wires penetrated the ground tackle through the horn mouth from the prestressing force pore canal is no longer taken place any dead bend card and is hindered to guarantee follow-up normal stretch-draw, normal anchor, solve because of the steel strand wires are pressed the dead bend and appear broken silk, smooth silk, clamping piece dislocation scheduling problem.
Description
Technical Field
The invention relates to the technical field of prestress construction, in particular to a method for cleaning a horn mouth of an anchor backing plate.
Background
The post-tensioning prestress adopted by the existing civil construction structure is more and more extensive, the levels of all construction teams are different, and the research and the recognition of technicians on fine links are insufficient, so that the phenomena of wire sliding and wire breaking frequently occur in a plurality of prestressed structures during prestress tensioning, and the clamping piece dislocation is common.
The research shows that the reason for dislocation of the clamping pieces and the thread breakage and the thread slippage are that the bell mouth of the anchor backing plate is blocked by mortar squeezed from the gaps between the anchor backing plate and the interfaces of the anchor plate and the corrugated pipe, so that the solidified mortar needs to be smashed for normal construction. However, after the member is maintained for more than ten days, the mortar curing strength reaches more than 50MPa, the conventional percussion drilling, electric hammer and manual chiseling modes are affected by space, only the mortar at the pipe orifice near the surface can be chiseled, the mortar can form an inclined plane again, the steel strand cannot be smoothly expanded after penetrating into the horn, and is bent, and the steel strand is easy to have the conditions of wire breakage, wire sliding, clamping piece dislocation, abnormal extension value and the like at the position, so that the anchoring performance is affected.
Disclosure of Invention
The invention aims to provide a method for cleaning a horn mouth of an anchor backing plate, which can effectively clean mortar in the horn mouth and avoid bending of a subsequent steel strand when the steel strand passes through the horn mouth.
The embodiment of the invention is realized by the following steps:
the embodiment of the invention provides a method for cleaning a bell mouth of an anchor backing plate, which is used for cleaning mortar in the bell mouth of a post-tensioned pre-stressed anchor backing plate, wherein a corrugated pipe extending to the bell mouth is arranged in the anchor backing plate, and the mortar is deposited and solidified between the anchor backing plate and the corrugated pipe; taking out the cut bellows; chiseling the exposed mortar to expose the inner wall of the bell mouth; and cleaning the chiseled mortar.
Optionally, the cutting the corrugated tube in the flare of the anchor pad to expose mortar in the flare comprises: and annularly cutting the corrugated pipe from the end part of the bell mouth to the arc starting point of the bell mouth to expose the mortar in the bell mouth.
Optionally, the cutting the corrugated pipe in the flare of the anchor backing plate to expose mortar in the flare further comprises: and spraying water into the bell mouth.
Optionally, the chiseling the exposed mortar to expose an inner wall of the bell mouth comprises: the mortar is rotationally chiseled from the arc starting point of the bell mouth to the end part direction of the bell mouth; and carrying out secondary chiseling on the residual mortar.
Optionally, the chiseling the exposed mortar to expose an inner wall of the bell mouth comprises: and spraying water into the bell mouth.
Optionally, a cutting device is used to cut the corrugated pipe and chisel the mortar.
Optionally, secondary chiseling is performed on the residual mortar by using an impact drill.
Optionally, after the cleaning the chiseled mortar, the method further comprises: checking whether accumulated water flows back in the pore channel of the anchor backing plate or not; and if so, cleaning the accumulated water which flows back.
Optionally, the cleaning the accumulated water flowing back comprises: and washing the pore channel with accumulated water flowing back to the anchor backing plate by using high-pressure water.
Optionally, after the flushing with high pressure water of the tunnel where standing water flows back to the anchor pad, the method further comprises: and drying the pore channel.
The embodiment of the invention has the beneficial effects that:
according to the method for cleaning the horn mouth of the anchor backing plate, provided by the embodiment of the invention, after the concrete of the prefabricated part is poured and before the steel strand bundle is threaded, mortar in the horn mouth is cleaned, the corrugated pipe in the horn mouth is cut off firstly, the mortar is chiseled after the mortar in the horn mouth is exposed, the mortar in the horn mouth is cleaned, the linearity of the steel strand penetrating into an anchor tool from a prestressed duct through the horn mouth is ensured to be smooth, any dead-bending block is not generated any more, the follow-up normal tensioning and normal anchoring are ensured, and the problems of broken wire, sliding wire, clamping piece dislocation and the like caused by the steel strand being pressed into a dead bend are solved; the cleaning method is high in applicability, is applicable to both the round bell mouth and the flat anchor bell mouth, and can be well applied to solving the problems of certain broken wires and sliding wires and space structures which are difficult to operate during the existing prestress construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural view of a conventional steel strand penetrating into a bell mouth of an anchor backing plate;
FIG. 2 is a flowchart of a method for cleaning a flare opening of an anchor pad according to an embodiment of the present invention;
FIG. 3 is a process diagram of a method for cleaning a flare opening of an anchor pad according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a steel strand penetrating into a bell mouth of an anchor backing plate after the cleaning method of the bell mouth of the anchor backing plate provided by the embodiment of the invention is adopted.
Icon: 11-anchor backing plate; 12-a bellows; 13-mortar; 14-steel strand wires; 15-cutting into pieces; h-cutting depth.
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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the 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.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The post-tensioning method prestress adopted by the existing civil construction structure is more and more extensive, the post-tensioning method prestress is firstly used for manufacturing a member, corresponding pore channels are reserved in the member body according to the positions of the prestressed tendons, after the concrete strength of the member reaches the specified strength (generally not lower than 75 percent of the design strength standard value), the prestressed tendons are penetrated into the reserved pore channels for tensioning, the tensioned prestressed tendons are anchored at the end parts of the member by using an anchorage device, and the pretensioning force of the prestressed tendons is transmitted to the concrete by the anchorage device at the end parts of the member, so that the prestressed tendons generate the prestress; and finally, pouring cement slurry into the pore channel to enable the prestressed tendons and the concrete member to form a whole.
However, during post-tensioning prestressing construction, due to the uneven levels of all construction teams, the research and the recognition of technicians on fine links are insufficient, so that the phenomena of wire sliding and wire breaking frequently occur in a plurality of prestressing structures during prestressing tensioning, and the phenomenon of staggered clamping pieces is common; however, these phenomena are often masked or ignored within the allowable range of the specification, and even if a constructor sees a problem, the problem is interpreted as a material cause, which is considered to be caused by a clip specification error and the like.
However, after frequent clip staggering and wire breaking and sliding at a plurality of work points, through careful study, the root cause is shown in fig. 1, the bell mouth of the anchor backing plate 11 is blocked by mortar 13 squeezed from the gap between the anchor backing plate 11 and the interface of the anchor plate and the corrugated pipe 12, after the member is maintained for more than ten days, the mortar 13 is mixed with other foreign matters, the curing strength of the mortar reaches more than 50MPa, the blocking matters do not directly block the bell mouth, but the smooth linear shape between the bell mouth and the anchorage is changed into large-angle bending (shown in fig. 1) under the action of cement paste, plastics, iron sheets and other foreign matters, so that a lateral additional external force is generated on the steel strand 14 to influence the prestress effect and even the wire breaking and sliding. Therefore, the solidified mortar 13 mixed with foreign matters at the position needs to be cleaned, the conventional percussion drill, the electric hammer and the manual chiseling mode are affected by space, only the mortar 13 at the pipe orifice near the surface can be chiseled, the mortar 13 forms an inclined plane again, the steel strand 14 cannot be smoothly expanded after penetrating into the horn, and the steel strand 14 is pressed into a dead bend broken wire and a slip wire, and the steel strand 14 is just a dead bend at the position where the steel strand 14 is forked in fig. 1. This is encountered even if the technician finds the situation to encourage the worker to chisel, the bit will always slip and the efficiency will be low. After neglected, the consequence of continuously installing the anchorage device for tensioning is that the steel strand 14 has the conditions of broken wire, staggered clamping pieces, abnormal elongation value and the like at the position.
In order to solve the above problems, the present embodiment provides a method for cleaning a bell mouth of an anchor backing plate, which can ensure that the bell mouth is smooth when a post-tensioned prestressing orifice is constructed, so that a steel strand 14 penetrates out of a corrugated pipe 12 and then freely bends to penetrate into an anchor without being affected by additional forces of the side wall of the bell mouth and foreign matters, and avoid the phenomena of inaccurate prestressing force, poor platform deviation due to retraction of a clamping piece, wire slippage due to clamping of a steel wire and the like caused by the dead bend of the steel strand 14 at the bell mouth as shown in fig. 1.
Specifically, referring to fig. 2, the method for cleaning a bell mouth of an anchor backing plate according to the present embodiment is used for cleaning mortar 13 in a bell mouth of a post-tensioned pre-stressed anchor backing plate 11, a corrugated pipe 12 extending to the bell mouth is arranged in the anchor backing plate 11, and the mortar 13 is deposited and solidified between the anchor backing plate 11 and the corrugated pipe 12, and the method includes:
s100: the corrugated pipe 12 is cut into the flare of the anchor backing plate 11 to expose the mortar 13 in the flare.
Firstly, cutting off the corrugated pipe 12 in the bell mouth to expose the mortar 13 in the bell mouth for subsequent cleaning of the mortar 13.
Further, when cutting the corrugated pipe 12, a circumferential cutting may be performed to circumferentially cut the corrugated pipe 12 from the end of the bell mouth to the starting point of the bell mouth, i.e., a cutting depth h shown in fig. 3, to expose the mortar 13 in the bell mouth.
During cutting, a cutting device is adopted for cutting, the diameter of the cutting piece 15 is selected to be smaller than that of the corrugated pipe 12 according to the depth of the bell mouth and the diameter of the corrugated pipe 12, the cutting piece can extend into the corrugated pipe 12, a screw rod with a proper length is selected and inserted into an electric drill bit clamp for clamping, the cutting device is assembled, a power supply is connected, and the start-up trial rotation is normal without large-amplitude eccentric swinging.
The cutting device can extend into a narrow pore passage to cut or chisel out the mortar 13 leaked into the solidification and the redundant corrugated pipe 12, so that the horn mouth is smooth.
The cutting device needs to customize and purchase an alloy saw blade, namely a cutting blade 15, a traditional electric hammer drill rod is adopted to cut off a drill bit and then is welded with a clamping bolt of the cutting blade 15, the drill bit is clamped on a common electric drill after the cutting blade 15 is clamped, the cutting blade 15 is transversely installed at the end part of the electric drill to perform annular outward cutting on the inner wall of a pipe orifice, bell mouths at two ends are checked before a steel strand 14 is penetrated, the cutting device is used for the unqualified bell mouths to extend into the bell mouths to reach the depth (cutting depth h) of the neck parts of the pipe orifices, and the electric drill is started to swing along the periphery to cut the corrugated pipe 12 and mortar 13 at the periphery of the corrugated pipe; then a small section is drawn out to continue annular cutting, the mortar 13 and the corrugated pipe 12 plugging body are cut into a plurality of circles of rings and even directly cut off and taken out, and finally an electric hammer and an impact drill bit are used for repairing.
Then slowly sending the cutting piece 15 into the mouth of the corrugated pipe 12 to reach the arc starting point of the bell mouth, rotating the cutting device to enable the cutting piece 15 to touch and cut the corrugated pipe 12 along the periphery of the pipe wall, and cutting the corrugated pipe 12 in the bell mouth in a whole circle.
In addition, in order to prevent the cutting blade 15 from being seriously abraded in a dry cutting mode, a water tank is arranged on the top of the prefabricated part or at a position higher than the bell mouth, and fine pipes are used for spraying water to the bell mouth to cool and wash dust.
S110: the cut bellows 12 is removed.
After the whole ring of the corrugated pipe 12 is cut off at the bell mouth, the clamp clamps the corrugated pipe 12 and pulls out the corrugated pipe 12 from the pore canal, and the individual corrugated pipe 12 which is pulled to be broken and still cannot be pulled out partially needs to be matched with a pointed drill by a high-speed chiseling worker.
S120: the exposed mortar 13 is chiseled to expose the inner wall of the bell mouth.
After the bellows 12 excision of horn mouth department, expose solidified mortar 13, clear up the mortar 13 back of this department, can expose the inner wall of horn mouth, clear away mortar 13 back, just make the intraoral space increase of horn mouth, penetrate behind steel strand wires 14 again, steel strand wires 14 just can not be by the intraoral mortar 13 of horn mouth and bellows 12 extrusion deformation, avoid steel strand wires 14 to be pressed into the condition of the dead bend here.
Specifically, S121: the mortar 13 is removed by rotating from the starting point of the bell mouth toward the end of the bell mouth.
Cutting is carried out by adopting a cutting device in a high-speed rotating state, and the chiseling mortar 13 is rotated from the arc starting point of the bell mouth to the end part direction of the bell mouth, namely the distance of the chiseling mortar 13 is the cutting depth h. And chiseling and moving outwards from the starting point of the bell mouth to the end part, rotating the cutting device to irregularly cut the mortar 13 adhered to the inner wall of the bell mouth until the pipe wall is exposed at a plurality of positions of the inner wall of the bell mouth, and drawing out the cutting device.
S122: the residual mortar 13 is chiseled a second time.
After a large area of mortar 13 is chiseled, residual mortar 13 still needs to be cleaned. When clearing up remaining mortar 13, adopt percussion bit to chisel out the clearance to remaining mortar 13 of horn mouth, until all the clean up of horn mouth mortar 13, expose horn mouth inner wall surface to no longer influence the extension of steel strand wires 14 in this department for the degree.
When the chiseling is performed twice, water is sprayed into the horn mouth to prevent the cutting blade 15 and the impact drill bit from being abraded, the cutting blade 15 and the impact drill bit are cooled during the chiseling, and dust generated during the chiseling is washed.
In addition, when the corrugated pipe 12 is cut and the mortar 13 is chiseled, the cutting device only cuts the mortar 13 and the corrugated pipe 12, the cutting blade 15 and the impact drill bit obviously slip after touching the pipe wall of the cast steel bell mouth, and then the cutting and chiseling are stopped, so that the pipe wall of the bell mouth is prevented from being damaged.
And when the corrugated pipe 12 is cut and the mortar 13 is chiseled, according to experience, the mortar 13 is cleaned as soon as possible at the initial stage of strength increase after the prefabricated part is demoulded, at the moment, the mortar 13 is solidified, but the hardness of the mortar is not maximized, and the cleaning is more labor-saving.
S130: the chiseled mortar 13 is cleaned.
After the mortar 13 is chiseled, the chiseled mortar 13 is cleaned out of the bell mouth for subsequent penetration of the steel strand 14.
S140: and checking whether accumulated water flows back in the pore channel of the anchor backing plate 11.
If so, cleaning the accumulated water in the backflow process.
Specifically, the pore channels where the accumulated water flows back to the anchor backing plate 11 are washed with high-pressure water and then dried. And after acceptance, informing the steel strand 14 to normally carry out prestress construction.
When the steel strand 14 penetrates, as shown in fig. 4, the three steel strands 14 are expanded, so that the phenomenon that the steel strand 14 is pressed into a dead bend is avoided, and the subsequent steel strand 14 can be normally tensioned and anchored.
According to the method for cleaning the horn mouth of the anchor backing plate, after the concrete of the prefabricated part is poured and before 14 steel strand penetrating bundles are carried out, mortar 13 in the horn mouth is cleaned, the corrugated pipe 12 in the horn mouth is cut off firstly, after the mortar 13 is exposed, the mortar 13 is chiseled off, the mortar 13 in the horn mouth is cleaned, the linearity of the steel strand 14 penetrating into an anchor through the horn mouth from a prestressed duct is guaranteed to be smooth, no dead-bending block occurs any more, so that the follow-up normal tensioning and normal anchoring are guaranteed, and the problems of broken wires, sliding wires, clamping piece dislocation and the like caused by the fact that the steel strand 14 is pressed into dead bends are solved; the cleaning method is high in applicability, is applicable to both the round bell mouth and the flat anchor bell mouth, and can be well applied to solving the problems of certain broken wires and sliding wires and space structures which are difficult to operate during the existing prestress construction.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for cleaning a horn mouth of an anchor backing plate is used for cleaning mortar in the horn mouth of a post-tensioned pre-stressed anchor backing plate, a corrugated pipe extending to the horn mouth is arranged in the anchor backing plate, and the mortar is deposited and solidified between the anchor backing plate and the corrugated pipe, and is characterized by comprising the following steps:
cutting the corrugated pipe in the bell mouth of the anchor backing plate to expose mortar in the bell mouth;
taking out the cut bellows;
chiseling the exposed mortar to expose the inner wall of the bell mouth;
cleaning the chiseled mortar;
cutting the corrugated pipe in the bell mouth of the anchor backing plate to expose mortar in the bell mouth comprises:
and annularly cutting the corrugated pipe from the end part of the bell mouth to the arc starting point of the bell mouth to expose the mortar in the bell mouth.
2. The method of claim 1, wherein cutting the corrugated tubing within the flare of the anchor pad to expose the mortar within the flare further comprises:
and spraying water into the bell mouth.
3. The method of claim 1, wherein the chiseling exposed grout to expose an inner wall of the flare comprises:
the mortar is rotationally chiseled from the arc starting point of the bell mouth to the end part direction of the bell mouth;
and carrying out secondary chiseling on the residual mortar.
4. The method of claim 3, wherein the chiseling the exposed grout to expose an inner wall of the flare comprises:
and spraying water into the bell mouth.
5. The method of claim 1, wherein the corrugated pipe is cut with a cutting device and the mortar is chiseled.
6. The method for cleaning a bell mouth of an anchor backing plate according to claim 3, wherein the residual mortar is subjected to secondary chiseling by using an impact drill.
7. The method of clearing an anchor pad flare of claim 1, wherein after the clearing the chiseled grout, the method further comprises:
checking whether accumulated water flows back in the pore channel of the anchor backing plate or not;
and if so, cleaning the accumulated water which flows back.
8. The method of clearing an anchor pad flare of claim 7, wherein the clearing the standing water that flows back comprises:
and washing the pore channel with accumulated water flowing back to the anchor backing plate by using high-pressure water.
9. The method of clearing an anchor pad flare in accordance with claim 8, wherein after the flushing with high pressure water of the tunnel where standing water flows back into the anchor pad, the method further comprises:
and drying the pore channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011004439.3A CN112207091B (en) | 2020-09-22 | 2020-09-22 | Method for cleaning horn mouth of anchor backing plate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011004439.3A CN112207091B (en) | 2020-09-22 | 2020-09-22 | Method for cleaning horn mouth of anchor backing plate |
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| CN112207091A CN112207091A (en) | 2021-01-12 |
| CN112207091B true CN112207091B (en) | 2022-02-11 |
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| CN107178038A (en) * | 2017-06-06 | 2017-09-19 | 盛勇 | Anchor plate for reducing anchor mouthful and horn mouth frictional resistance |
| CN206854280U (en) * | 2017-05-18 | 2018-01-09 | 四川建筑职业技术学院 | A kind of pipe cleaning device |
| CN108590225A (en) * | 2018-07-12 | 2018-09-28 | 中交路桥华南工程有限公司 | The removal tool and its application method of concrete embedded tubing |
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2020
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04225877A (en) * | 1990-12-27 | 1992-08-14 | Ishikawajima Kensa Keisoku Kk | Bellows cleaning device |
| CN102794284A (en) * | 2012-08-10 | 2012-11-28 | 中铁隧道集团有限公司 | Dredge device of annular embedded corrugated pipe duct and dredge method thereof |
| CN103835510A (en) * | 2014-03-10 | 2014-06-04 | 北京工业大学 | Method for removing concrete blocking in corrugated pipe |
| CN104499424A (en) * | 2014-12-23 | 2015-04-08 | 中冶交通工程技术有限公司 | Device for removing concrete from corrugated pipe and application method thereof |
| CN206854280U (en) * | 2017-05-18 | 2018-01-09 | 四川建筑职业技术学院 | A kind of pipe cleaning device |
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| CN112207091A (en) | 2021-01-12 |
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