CN117949130A - Method for monitoring installation of single-anchor cable gauge based on steel strand under group anchor condition - Google Patents
Method for monitoring installation of single-anchor cable gauge based on steel strand under group anchor condition Download PDFInfo
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- 238000009434 installation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 23
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- 125000006850 spacer group Chemical group 0.000 claims description 22
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- 238000012806 monitoring device Methods 0.000 description 1
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Abstract
The invention discloses a method for monitoring the installation of a single-anchor cable gauge of a steel strand under a group-anchor condition, and relates to the technical field of bridge construction. According to the invention, the steel strand group anchors and the single anchors are combined for tensioning for multiple times, the single anchor cable force intelligent real-time monitoring is implemented in the group anchors, meanwhile, the single anchor cable meter mounting technology after the group anchors, the anchor clamping piece external separation type anti-loosening device and the steel strand secondary tensioning jack supporting counter force conversion technology are developed, the technical problems that the steel strand group anchors and the single anchors are independently used, the group anchor cable meter and the single anchor cable meter are independently monitored, the anchor cable meter cannot adapt to the mounting after the anchors, the anchor clamping piece anti-loosening device cannot separate and limit in vitro and the like are effectively solved, the anchor mounting technology after the anchors has stronger adaptability to engineering construction environments, the anchor clamping piece separation type anti-loosening device can effectively solve the problem that the group anchors and the single anchor steel strands cannot be effectively loosened due to the fact that the internal clamping piece and the external clamping piece are in the same direction and different surfaces, the risk of the steel strand releasing is reduced, and the steel strand tensioning risk is controllable.
Description
Technical Field
The invention belongs to the technical field of bridge construction, and particularly relates to a method for monitoring installation of a single-anchor cable gauge based on steel strands under a group anchor condition.
Background
The monitoring of the cable in the current large-span bridge mainly utilizes an anchor rope meter to monitor the cable force, and can be specifically subdivided into single-anchor rope meter monitoring and group-anchor rope meter monitoring according to different cable and anchorage forms, wherein the single-anchor rope meter monitoring and the group-anchor rope meter monitoring are independently used. The monitoring of the tension of the large-tonnage group anchor steel strand adopts the method that a large-tonnage anchor cable gauge is arranged between a group anchor backing plate and an anchor device, and the cable force is measured and monitored. The installation eccentricity of the anchor cable meter can influence the measurement progress, in order to ensure the measurement accuracy, the anchor cable meter cylinder body needs to be stressed as evenly as possible, the size of the selected anchor cable meter needs to be matched with the size of an anchor, so that the large-tonnage group anchor generally needs to be selected from the large-tonnage anchor cable meter, the anchor cable, the steel stranded wire, the anchor backing plate, the anchor and the jack, the centers of the five bodies are coaxial, when the load enables the anchor cable meter steel cylinder to generate axial deformation, the strain gauge and the steel cylinder generate synchronous deformation, the vibrating wire of the strain gauge generates stress change, the strain quantity which causes the deformation of the stressed steel cylinder is measured through the change of the vibration frequency of the vibrating wire, and the load value sensed by the anchor cable meter is calculated by substituting the calibration coefficient.
Aiming at the installation and monitoring of the existing large-tonnage group anchor steel strand anchor rope meter, the technical defects are that the large-tonnage group anchor is usually required to be selected, the anchor rope meter is required to be installed between an anchor backing plate and an anchor device, the installation and the monitoring form of the anchor rope meter are single, and intelligent real-time monitoring of single anchor rope force in the group anchor cannot be realized; for the steel strands which need to be stretched for a long time, the phenomenon of uneven loosening loss of the cable force of the steel strands can occur, the traditional anchor cable meter can only monitor the change condition of the cable force of the whole bundle of steel strands, and can not effectively reflect the rule of Shan Maosuo force and group anchor cable force change, so that detailed steel strand cable force change contrast data can not be provided in the early stage, and reasonable pre-stretching value and secondary stretching value can not be accurately calculated according to the uneven loss of the cable force technically; meanwhile, the existing anchor cable gauge mounting and monitoring technology is limited by the need of being mounted between an anchor backing plate and an anchor device, and cannot adapt to special construction conditions of the anchor cable gauge mounted after group anchoring, so that a large amount of reworking is caused, the construction period is delayed, and the cost is increased; in addition, the large-tonnage anchor cable gauge has the advantages of large weight, high cost and strict processing precision requirement, longer steel stranded wires are reserved on site, auxiliary measures are added for installation, and the large-tonnage anchor cable gauge is often limited by structural space, so that the large-tonnage anchor cable gauge is difficult to install and detach and is uneconomical.
Disclosure of Invention
The invention aims to provide a method for installing and monitoring a single-stranded-wire anchor rope meter based on a group anchor condition, which is characterized in that a single-anchor rope force intelligent real-time monitoring technology is implemented in a group anchor, meanwhile, the technology for installing the single-anchor rope meter after the group anchor, an anchor clamping piece external separation type anti-loosening device, a steel strand secondary tensioning jack supporting counter force conversion technology are developed, and the technical problems that the traditional steel strand group anchor and the single anchor are independently used, the group anchor rope meter and the single-anchor rope meter are independently monitored, the anchor rope meter cannot adapt to the installation after the anchor, the anchor clamping piece anti-loosening device cannot be separated and limited in vitro and the like are effectively solved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a method for monitoring the installation of a single-anchor cable gauge of a steel strand under a group anchor condition, which comprises the following steps:
S1, enabling a group anchor steel strand and a single anchor steel strand to pass through an anchor backing plate and a group anchor according to a designated sequence, installing anchor clamping pieces on the group anchor steel strand, tightly jacking the anchor clamping pieces towards the inside of the group anchor, cutting off redundant lengths of the group anchor steel strand and the single anchor steel strand, penetrating into a hydraulic jack and a limiting plate, penetrating into a tool anchor at the outer side of the hydraulic jack, installing tool clamping pieces on the group anchor steel strand corresponding to a tool anchor hole position, tightly jacking the tool clamping pieces, and penetrating into corresponding holes on the tool anchor by the single anchor steel strand;
s2, tensioning the whole group anchor steel strands to a designed tension through a hydraulic jack, and then, shrinking a cylinder through the hydraulic jack to enable anchor clamping pieces on the group anchor to lock the group anchor steel strands, and tensioning the group anchor steel strands after the hydraulic jack and the tool anchor are removed;
S3, penetrating Shan Maosuo a force monitoring mechanism on the single-anchor steel twisted wire, enabling the single-anchor force monitoring mechanism to be clung to the surface of the group anchor anchorage device, then installing a single Kong Mao jack outside the single-anchor force monitoring mechanism to stretch the single-anchor steel twisted wire, tightly propping a single-hole anchor working clamping piece towards the inside of the single-anchor force monitoring mechanism after stretching to a designed pulling force, controlling a single-hole anchor jack cylinder to retract, enabling the single Kong Mao working clamping piece to lock the single-anchor steel twisted wire in a follow-up mode, taking the group anchor as a counterforce support, enabling the stretching force on the single-anchor steel twisted wire to be transmitted to background integrated data through a wire on the Shan Maosuo force monitoring mechanism, and completing installation of the Shan Maosuo force monitoring mechanism and stretching of the single-anchor steel twisted wire after removing the single Kong Mao jack and the tool anchor;
s4, penetrating a top pipe into the group anchor steel stranded wires, enabling one end of the top pipe to prop against an anchor clamping piece in an anchor hole of a corresponding group anchor, penetrating an anti-loosening pressing plate and a hollow bolt according to the principle that hole position arrangement corresponds to a working anchor one by one, tightly propping against the other end of the top pipe, and then screwing the hollow bolt to enable the top pipe to compress the anchor clamping piece into the anchor hole of the group anchor, wherein a single Kong Mao working clamping piece is compressed by the hollow bolt in the same mode;
S5, carrying out real-time monitoring on the tension force of the single-anchor steel strand by utilizing a Shan Maosuo force monitoring mechanism, when the single-anchor steel strand is subjected to prestress loss due to long-term holding, carrying out tensioning on the steel strand, dismantling an anti-loosening pressing plate, a hollow bolt and a jacking pipe before secondarily tensioning the group anchor steel strand and the single-anchor steel strand, enabling the single-anchor steel strand to pass through the center of a supporting frame and enabling the supporting frame to be supported on an anchor backing plate, taking the supporting frame as a counterforce medium, and selecting a single Kong Mao jack to tension the single-anchor steel strand until the Shan Maosuo force monitoring mechanism and the group anchor are loosened;
S6, placing a movable clamping piece in an anchor hole of the group anchor corresponding to the single anchor steel strand, removing the single Kong Mao working clamping piece at the same time, starting to open the single-hole anchor jack so that the movable clamping piece in the anchor hole of the group anchor is used for locking the single anchor steel strand, and finally removing the single-hole anchor jack, the support frame and the single anchor cable force monitoring mechanism;
S7, repeating the step S02, tensioning the group anchor steel strands for the second time to a design value by using the hydraulic jack, anchoring, and then dismantling the hydraulic jack;
S8, penetrating Shan Maosuo a force monitoring mechanism on the single-anchor steel twisted wire, wherein a single-hole anchor working clamping piece is not installed on the single-anchor cable force monitoring mechanism, referring to the steps S5 to S6, selecting a single-hole anchor jack to stretch the single-anchor steel twisted wire after installing a support frame, enabling the single-anchor steel twisted wire to withdraw from anchors on movable clamping pieces of group anchor devices, removing anchor clamping pieces, adjusting the single Kong Mao jack to design pulling force, installing a single Kong Mao working clamping piece on the single-anchor cable force monitoring mechanism, then retracting a cylinder of the single-hole anchor jack, enabling the single-Kong Mao working clamping piece on the single-anchor cable force monitoring mechanism to lock the single-anchor steel twisted wire in a follow-up manner, converting the stretching force on the single-anchor steel twisted wire into pressure on the single-anchor cable force monitoring mechanism, and transmitting the pressure to background integrated data through a lead on the Shan Maosuo force monitoring mechanism;
s9, after the single Kong Mao jack and the support frame are removed, the secondary tensioning stress conversion of the Shan Maosuo force monitoring mechanism is completed, a jacking pipe, an anti-loosening pressing plate and a hollow bolt are penetrated into a group anchor steel twisted wire in the same mode as the step S4, clamping pieces on the group anchor and the single anchor cable force monitoring mechanism are tightly pressed into anchor holes by screwing the hollow bolt, and the secondary tensioning of the group anchor steel twisted wire and the single anchor steel twisted wire and the secondary conversion of the single anchor cable force monitoring are completed;
S10, repeating the steps S5 to S9, monitoring the cable force of the steel strands in real time by using a Shan Maosuo force monitoring mechanism, and carrying out subsequent re-tensioning and circulating operation of the group anchor steel strands and the single anchor steel strands according to engineering requirements.
As a preferable technical scheme of the invention, the single-anchor cable force monitoring mechanism comprises a plum blossom gasket, a Shan Maosuo force meter and a single-hole anchor, wherein the single-anchor cable force meter comprises an anchor cable sensor arranged on the plum blossom gasket, the pressure on the single-hole anchor is transmitted to the anchor cable sensor through the Shan Maosuo force meter, and a pressure signal monitored by the anchor cable sensor is transmitted to the background through a lead wire on the Shan Maosuo force meter.
As a preferred technical solution of the present invention, the step S3 specifically includes: the quincuncial spacer, the single-hole cable force gauge, the single-hole anchor and the single-hole anchor working clamping piece are sequentially penetrated into the single-hole anchor steel twisted wire, the quincuncial spacer is tightly attached to the surface of the group anchor, then a single Kong Mao jack is installed at the outer side of the single-hole anchor to stretch the single-anchor steel twisted wire, a tool anchor is installed at the outer side of the single-hole anchor jack, the single-hole anchor working clamping piece is tightly propped against the inner part of the single-hole anchor after the single-hole anchor steel twisted wire is stretched to a design pulling force, a single-hole anchor jack shrinkage cylinder is controlled, the single Kong Mao working clamping piece locks the single-anchor steel twisted wire in a follow-up manner, the single-hole anchor back pressure Shan Maosuo force gauge transmits the stretching force to the anchor cable sensor and the quincuncial spacer, finally the group anchor is used as a counterforce support, the stretching force on the single-anchor steel twisted wire is transmitted to background integrated data through a wire on the Shan Maosuo force gauge, and the single-jack Kong Mao jack and the tool anchor are removed to complete the installation of the single-jack Shan Maosuo force gauge and the stretching of the single-anchor steel twisted wire.
As a preferred technical solution of the present invention, the step S8 specifically includes: and (3) sequentially penetrating a plum blossom spacer, a single-hole cable gauge and a single-hole anchor into a single-hole steel twisted wire, wherein a single-hole anchor working clamping piece is not installed on the single-hole anchor, referring to steps S5 to S6, selecting a single-hole anchor jack to stretch the single-hole anchor steel twisted wire after installing a supporting frame, enabling the single-hole anchor steel twisted wire to withdraw from the movable clamping piece on a group anchor, removing the anchor clamping piece, installing a single Kong Mao working clamping piece on the single-hole anchor after adjusting a single Kong Mao jack to a design pulling force, then retracting a cylinder of the single-hole anchor jack, enabling the single Kong Mao working clamping piece on the single-hole anchor to lock the single-hole anchor steel twisted wire, transmitting the stretching force to the single-anchor cable gauge, the plum blossom spacer and the group anchor through the single-hole anchor counter-pressure Shan Maosuo, converting the stretching force on the single-anchor steel twisted wire into pressure to a single-anchor cable force monitoring mechanism, and transmitting the single-hole anchor cable force monitoring mechanism to the background integrated data through a wire on the Shan Maosuo force monitoring mechanism.
As a preferable technical scheme of the invention, the support frame comprises a support plate, a reinforcing rib and a support cross beam; the steps S5-S6 specifically comprise: the method comprises the steps of utilizing Shan Maosuo force monitoring mechanisms to monitor the tension force of a single-anchor steel strand in real time, when the single-anchor steel strand is subjected to prestress loss due to long-term holding, carrying out tensioning on the steel strand, dismantling an anti-loosening pressing plate, a hollow bolt and a jacking pipe before secondary tensioning of a group of anchor steel strands and the single-anchor steel strand, enabling the single-anchor steel strand to pass through the center of a supporting frame and enable the supporting frame to be supported on an anchor backing plate, taking the supporting frame as a counterforce medium, and selecting a single Kong Mao jack to tension the single-anchor steel strand until the Shan Maosuo force monitoring mechanism and the group anchor are loosened; and (3) placing a movable clamping piece in an anchor hole of the group anchor corresponding to the single anchor steel strand, removing a single Kong Mao working clamping piece on the single hole anchor, starting to open the single hole anchor jack so that the movable clamping piece in the anchor hole of the group anchor is used for locking the single anchor steel strand, and finally removing the single hole anchor jack, the support frame, the single Kong Mao and the plum blossom gasket.
As a preferable technical scheme of the invention, the height of the supporting frame needs to meet the following conditions:
H≥A+L+70mm
Wherein H is the net height of the support frame, A is the thickness of the group anchor, L is the thickness of the plum blossom spacer, the length of the single anchor cable force meter and the length of the single Kong Mao, and 70mm is the length of the clamping piece and the stretching reserved space.
As a preferable technical scheme of the invention, the thickness t of the groove thin wall on the plum blossom gasket is required to meet the following conditions:
e1＜t＜e1+e2
wherein e 1 is the distance from the outer edge of the steel strand to the edge of the anchor hole, and e 2 is the clear distance between adjacent anchor holes.
As a preferable technical scheme of the invention, the jacking pipe is arranged into a circular pipe structure, and the length, the diameter and the pipe wall thickness of the jacking pipe are required to meet the following conditions:
L≥B+C+D+20
d Inner part ≥d Steel strand +1,d Outer part ≤d Hole(s)
δmin≤δ≤δmax
Wherein L is the length of the jacking pipe, B is the thickness of the quincuncial spacer, C is the length of the single-anchor cable gauge, D is the length of the single-hole anchor, D Inner part is the inner diameter of the jacking pipe, D Outer part is the outer diameter of the jacking pipe, D Steel strand is the nominal diameter of the steel strand, D Hole(s) is the diameter of the big-head anchor hole on the anchor, delta is the thickness of the jacking pipe, delta min is the minimum thickness of the jacking pipe, delta max is the maximum thickness of the jacking pipe, F is the total tensile force of the steel strand, Is the stability coefficient of the jacking pipe, S is the total number of steel strands, and [ sigma ] is the design strength of the jacking pipe.
The invention has the following beneficial effects:
1. The invention provides a method for carrying out intelligent real-time monitoring on single anchor cable force in a large-tonnage steel strand group anchor and single anchor by combining and stretching the group anchor, and simultaneously develops a technology for installing a single anchor cable meter after the group anchor, an anchor clamping piece external separation type anti-loosening device, a steel strand secondary stretching jack supporting counter force conversion technology, and effectively solves the technical problems that the traditional steel strand group anchor and the single anchor are independently used, the group anchor cable meter and the single anchor cable meter are independently monitored, the anchor cable meter cannot be adapted to the installation after the anchor, the anchor clamping piece anti-loosening device cannot be separated and limited in vitro and the like.
2. The invention has simple construction, light and convenient device, and the anchor clamping piece separation type anti-loosening device has stronger adaptability to engineering construction environment, can effectively solve the problem that the group anchors and the single anchor steel strands cannot be effectively loosened because the inner clamping piece and the outer clamping piece are in the same direction and different surfaces, reduces the risk of the steel strand off-anchor, ensures that the steel strand tensioning risk is controllable, has strong pertinence of cable force monitoring, reduces the use of a large-tonnage anchor cable meter, reduces the construction difficulty, saves the construction cost, ensures the engineering construction safety and achieves the effect of intelligent real-time monitoring.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a first implementation diagram of a method for monitoring the installation of a single-anchor cable gauge based on a steel strand under a group anchor condition in the invention.
Fig. 2 is a second implementation diagram of the method for monitoring the installation of the single-anchor cable gauge based on the steel strand under the group anchor condition in the invention.
FIG. 3 is a sectional view of FIG. 2 taken along line 1-1.
Fig. 4 is a schematic structural view of a quincuncial spacer according to the present invention.
Fig. 5 is a third implementation diagram of the method for monitoring the installation of the single-anchor cable gauge based on the steel strand under the group anchor condition in the invention.
Fig. 6 is a front view of the structure of the support frame according to the present invention.
Fig. 7 is a side view of the structure of the support frame of the present invention.
Fig. 8 is a top view of a support frame according to the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1-anchoring body, 2-anchor backing plate, 3-group anchor anchorage, 3 a-anchor clamping piece, 4-jacking pipe, 5-plum blossom gasket, 6-single anchor cable force meter, 7-single hole anchor, 8-locking clamp plate, 9-hollow bolt, 10 a-group anchor steel strand, 10 b-single anchor steel strand, 11-support frame, 11 a-support plate, 11 b-support beam, 11 c-reinforcing rib, 12-hydraulic jack and 13-single hole anchor jack.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-8, the invention discloses a method for monitoring the installation of a single-anchor cable gauge of a steel strand under a group anchor condition, which comprises the following steps:
S1, as shown in FIG. 1, a group anchor steel strand 10a and a single anchor steel strand 10b penetrate through an anchor backing plate 2 and a group anchor 3 according to a designated sequence, an anchor clamping piece 3a is installed on the group anchor steel strand 10a, after the installation is completed, the anchor clamping piece 3a is tightly jacked into the group anchor 3, the redundant lengths of the group anchor steel strand 10a and the single anchor steel strand 10b are cut off and then penetrate into a hydraulic jack 12 and a limiting plate, then a tool anchor is penetrated outside the hydraulic jack 12, tool anchor hole positions are arranged in one-to-one correspondence with working anchors, the strands are prevented, the tool clamping pieces are installed on the group anchor steel strand 10a corresponding to the tool anchor hole positions and are tightly jacked, and the single anchor steel strand 10b penetrates into a corresponding hole position on the tool anchor (namely, a single anchor steel strand 10b for cable force monitoring is reserved on the outer side and penetrates into the tool anchor only and does not install the anchor clamping piece 3 a);
S2, as shown in FIG. 1, tensioning the whole bundle of group anchor steel strands 10a to a designed tension (single anchor steel strands 10b for cable force monitoring are not tensioned) through a hydraulic jack 12, and then, carrying out cylinder shrinkage through the hydraulic jack 12, so that an anchor clamping piece 3a on the group anchor 3 is enabled to follow up the locking group anchor steel strands 10a, and tensioning the group anchor steel strands 10a after the hydraulic jack 12 and a tool anchor are removed;
S3, as shown in figures 2-4, penetrating Shan Maosuo a force monitoring mechanism on the reserved single-anchor steel strand 10b, enabling the single-anchor force monitoring mechanism to be clung to the surface of the group anchor 3, then installing a single Kong Mao jack 13 outside the single-anchor force monitoring mechanism to stretch the single-anchor steel strand 10b, tightly jacking a single-hole anchor working clamping piece into the single-anchor force monitoring mechanism after stretching to a designed tensile force, controlling a cylinder of the single Kong Mao jack 13 to enable the single Kong Mao working clamping piece to follow up and lock the single-anchor steel strand 10b, taking the group anchor 3 as a counterforce support, enabling the stretching force on the single-anchor steel strand 10b to be transmitted to background integrated data through a wire on the Shan Maosuo force monitoring mechanism, and completing installation of the Shan Maosuo force monitoring mechanism and stretching of the single-anchor steel strand 10b after removing the single Kong Mao jack 13 and a tool anchor;
S4, as shown in figures 2-4, penetrating a jacking pipe 4 into a group anchor steel strand 10a, enabling one end of the jacking pipe 4 to tightly prop against an anchor clamping piece 3a in a hole of a corresponding group anchor 3, penetrating an anti-loosening pressing plate 8 and a hollow bolt 9 according to the principle that hole position arrangement corresponds to a working anchor one by one, tightly propping against the other end of the jacking pipe 4, screwing the hollow bolt 9 to enable the jacking pipe 4 to tightly press the anchor clamping piece 3a into the hole of the group anchor 3, and enabling a single-hole anchor working clamping piece to tightly press through the hollow bolt 9 in the same manner, so that two clamping pieces with the same direction and different surfaces of the group anchor steel strand 10a and the single anchor steel strand 10b can adjust the limiting effect of the external anti-loosening pressing plate 8 and the hollow bolt 9 on the internal clamping piece and the external clamping piece of the anchor through the jacking pipe 4;
S5, as shown in figures 5-8, carrying out real-time monitoring on the tension force of the single-anchor steel strand 10b by utilizing a Shan Maosuo force monitoring mechanism, supplementing the tension of the steel strand when the single-anchor steel strand 10b is subjected to prestress loss due to long-term holding, dismantling the loosening prevention pressing plate 8, the hollow bolt 9 and the jacking pipe 4 before the group anchor steel strand 10a and the single-anchor steel strand 10b are tensioned for the second time, enabling the single-anchor steel strand 10b to pass through the center of the supporting frame 11 and enabling the supporting frame 11 to be supported on the anchor backing plate 2, and taking the supporting frame 11 as a counterforce medium, and selecting a single Kong Mao jack 13 to stretch the single-anchor steel strand 10b until the Shan Maosuo force monitoring mechanism and the group anchor 3 are loosened;
Placing movable clamping pieces in the anchor holes of the group anchor 3 corresponding to the single anchor steel strands 10b, removing the single Kong Mao working clamping pieces at the same time, starting to open the single-hole anchor jack 13 so that the movable clamping pieces in the anchor holes of the group anchor 3 can lock the single anchor steel strands 10b in a follow-up manner, and finally removing the single-hole anchor jack 13, the support frame 11 and the single anchor cable force monitoring mechanism;
s6, repeating the step S02, secondarily tensioning the group anchor steel strand 10a to a design value by utilizing the hydraulic jack 12 (large tonnage) and anchoring, wherein the single anchor steel strand 10b for cable force monitoring is not tensioned, and then the hydraulic jack 12 is dismantled;
S7, penetrating Shan Maosuo a force monitoring mechanism on the single-anchor steel stranded wire 10b, wherein a single-hole anchor working clamping piece is not installed on the single-anchor force monitoring mechanism, referring to step S5, after installing the support frame 11, selecting the single-hole anchor jack 13 to stretch the single-anchor steel stranded wire 10b, enabling the single-anchor steel stranded wire 10b to withdraw anchors from movable clamping pieces on the group anchor 3, removing the anchor clamping piece 3a, adjusting the single Kong Mao jack 13 to design tension, installing a single Kong Mao working clamping piece on the single-anchor force monitoring mechanism, then shrinking a cylinder of the single Kong Mao jack 13, enabling the single Kong Mao working clamping piece on the single-anchor force monitoring mechanism to lock the single-anchor steel stranded wire 10b, converting the stretching force on the single-anchor steel stranded wire 10b into pressure on the single-anchor force monitoring mechanism, and transmitting the single-anchor steel stranded wire to background integrated data through a wire on the Shan Maosuo force monitoring mechanism;
S8, after the single Kong Mao jack 13 and the supporting frame 11 are removed, the secondary tensioning stress conversion of the Shan Maosuo force monitoring mechanism is completed, in the same mode as the step S4, the jacking pipe 4, the anti-loosening pressing plate 8 and the hollow bolt 9 are penetrated into the group anchor steel stranded wire 10a according to the principle that hole position arrangement corresponds to a working anchor one by one, and clamping pieces on the group anchor 3 and the single anchor rope force monitoring mechanism are tightly pressed into anchor holes by screwing the hollow bolt 9, so that the secondary tensioning of the group anchor steel stranded wire 10a and the single anchor steel stranded wire 10b and the secondary conversion of the single anchor rope force monitoring are completed;
S9, repeating the steps S5 to S8, monitoring the cable force of the steel strands in real time by using a Shan Maosuo force monitoring mechanism, and carrying out subsequent re-tensioning and circulating operation of the group anchor steel strands 10a and the single anchor steel strands 10b according to engineering requirements.
In this embodiment of the invention, the Shan Maosuo force monitoring mechanism comprises a quincuncial spacer 5, a single-anchor cable force gauge 6 and a single-hole anchor 7, wherein the single-anchor cable force gauge 6 comprises an anchor cable sensor arranged on the quincuncial spacer 5, the pressure on the single-hole anchor 7 is transmitted to the anchor cable sensor through the Shan Maosuo force gauge 6, and the pressure signal monitored by the anchor cable sensor is transmitted to the background through a lead wire on the Shan Maosuo force gauge 6.
In this embodiment of the present invention, step S3 specifically includes: the method comprises the steps of sequentially penetrating a plum blossom spacer 5, a single-anchor cable gauge 6, a single-hole anchor 7 and a single-hole anchor working clamping piece into a reserved single-anchor steel strand 10b, enabling the plum blossom spacer 5 to be tightly attached to the surface of a group anchor anchorage 3, enabling the plum blossom spacer 5 to avoid interference of adjacent clamping pieces, installing a single-hole anchor jack 13 outside the single-hole anchor 7 to stretch the single-anchor steel strand 10b, installing a tool anchor outside a single-Kong Mao jack 13, tightly jacking the single-hole anchor working clamping piece into the single Kong Mao 7 after stretching to a designed tensile force, controlling a single Kong Mao jack 13 to shrink a cylinder, enabling the single Kong Mao working clamping piece to lock the single-anchor steel strand 10b, enabling the single Kong Mao 7 to back-pressure Shan Maosuo force gauge 6 to transmit the tensile force to an anchor cable sensor and the plum blossom spacer 5, and finally relying on the group anchor 3 as a counterforce support, enabling the tensile force on the single-anchor steel strand 10b to be transmitted to background integrated data through a wire on the Shan Maosuo force gauge 6, and completing installation of the single Kong Mao jack 13 and the tool anchor after removing the single 5262 force gauge 6 and the single-anchor 10 b.
In this embodiment of the present invention, step S7 specifically includes: sequentially penetrating a plum blossom gasket 5, a single anchor cable gauge 6 (comprising a sensor and a wire) and a single hole anchor 7 into a reserved single anchor steel strand 10b which is not stretched for the second time, installing a support frame 11 without installing a single Kong Mao working clamping piece on the single hole anchor 7, selecting a single Kong Mao jack 13 to stretch the single anchor steel strand 10b by taking the support frame 11 as a counterforce medium, withdrawing the single anchor steel strand 10b from the movable clamping piece on the group anchor 3, and removing an anchor clamping piece 3a; and after the single Kong Mao jack 13 is adjusted to design tension, a single-hole anchor working clamping piece is installed on the single-hole anchor 7, then the single Kong Mao jack 13 is contracted, the single Kong Mao working clamping piece on the single-hole anchor 7 locks the single-anchor steel strand 10b in a follow-up mode, the tension is transmitted to the single-anchor cable force gauge 6, the plum blossom gasket 5 and the group anchor 3 step by step through the single Kong Mao counter-pressure Shan Maosuo force gauge 6, the tension on the single-anchor steel strand 10b is converted into pressure on the single-anchor cable force monitoring mechanism, and the tension is transmitted to background integrated data through a wire on the Shan Maosuo force monitoring mechanism.
In this embodiment of the present invention, the supporting frame 11 includes a supporting plate 11a, a reinforcing rib 11c, and a supporting beam 11b;
The step S5 specifically comprises the following steps: carrying out real-time monitoring on the tension force of the single-anchor steel strand 10b by utilizing a Shan Maosuo force monitoring mechanism, when the single-anchor steel strand 10b is subjected to prestress loss due to long-term holding, carrying out tensioning on the steel strand, dismantling an anti-loosening pressing plate 8, a hollow bolt 9 and a jacking pipe 4 before carrying out secondary tensioning on the group-anchor steel strand 10a and the single-anchor steel strand 10b, enabling the single-anchor steel strand 10b to pass through the center of a supporting beam 11b and enable the supporting frame 11 to be supported on an anchor backing plate 2, taking the supporting frame 11 as a counterforce medium, and selecting a single Kong Mao jack 13 to stretch the single-anchor steel strand 10b until the Shan Maosuo force monitoring mechanism and the group-anchor 3 are loosened;
and (3) placing movable clamping pieces in the anchor holes of the group anchor 3 corresponding to the single anchor steel strands 10b, removing the single-hole anchor working clamping pieces on the single-hole anchors 7, starting to open the single-hole anchor jacks 13 to enable the movable clamping pieces in the anchor holes of the group anchor 3 to lock the single anchor steel strands 10b in a follow-up manner, and finally removing the single-hole anchor jacks 13, the supporting frames 11, the single-hole anchors 7 and the plum blossom gaskets 5. And all the anchors of all the steel strands are transferred to the anchors, so that space is provided for tensioning the next group of anchor steel strands.
For large-span bridge engineering, the large-tonnage tensioning demand is more and more, the number of large-tonnage steel strands is also increased, and a plurality of steel strands are anchored in groups through large-diameter anchors so as to meet common stress. In order to accurately monitor a single steel strand, a steel strand is led out from a group anchor to carry out single anchor, the total number of the steel strands which are anchored by stretching is assumed to be S, the steel strands of the single anchor are removed, the rest group anchor steel strands are (S-1), the single anchor and the (S-1) group anchor are integral and independent, and the single anchor and the (S-1) group anchor are combined to meet different use requirements. For the whole steel strand, the single anchor and the (S-1) group anchors participate in the tensioning stress of the steel strand together, so as to provide the needed large tonnage pulling force for engineering; the independence of the single anchor and the (S-1) group anchor is mainly characterized in that the single anchor and the (S-1) group anchor are independent in tensioning, anchoring and acting, the jack and the clamping piece are utilized for independent tensioning and anchoring, and the anchor cable gauge provides a steel strand pressure value through single anchor bearing.
When the steel strand needs to be tensioned for the second time, single-anchor tension is needed to be carried out, and a single-anchor tension support frame is developed for the single-anchor tension support frame, wherein the support frame mainly comprises a support plate, reinforcing ribs, a cross beam and a base plate, the height of the support frame needs to meet H more than or equal to A+L+70mm (H is the net height of the support frame 11, A is the thickness of the group anchor 3, L is the thickness of a plum blossom gasket 5+the length of a single-anchor cable meter 6+the length of a single Kong Mao, and 70mm is the length of a clamping piece and a tensioning reserved space).
In order to realize single anchor cable force monitoring in large-tonnage group anchors, the traditional cable force monitoring mode is optimized, and a single anchor cable force intelligent real-time monitoring technology for installing a single anchor cable meter after the group anchors is provided. A steel strand is selected to be installed on the outer side of the group anchor anchorage 3 to form a Shan Maosuo force monitoring mechanism, and the single anchor cable force monitoring mechanism mainly comprises a plum blossom gasket 5, a single anchor cable force meter 6 and a single hole anchor 7. The group anchor steel strands 10a are limited by the anchor hole, so that the distance between the steel strands is very compact, the clear distance between adjacent clamping pieces of the anchor is narrower, and for this purpose, a quincuncial gasket (namely, a quincuncial gasket 5) is developed, and as shown in fig. 4, the thickness t of the quincuncial gasket groove thin wall needs to satisfy the relation: e 1＜t＜e1+e2, wherein e 1 is the distance from the outer edge of the steel strand to the edge of the anchor hole, and e 2 is the clear distance between adjacent anchor holes. The quincuncial spacer groove is embedded into the adjacent clamping pieces through the thin wall, interference of the adjacent clamping pieces is avoided, the problem that the clearance between the clamping pieces is narrow and the traditional regular spacer is difficult to put in is perfectly solved, in addition, the quincuncial spacer bulge part has the effect of increasing the bearing surface, and the effect of dispersing concentrated force is achieved. A single-anchor rope meter sensor is placed on the quincuncial gasket, pressure is provided by means of an outer single-hole anchor, and data are transmitted to the background through a wire connected with the anchor rope meter, so that the purpose of real-time monitoring is achieved.
The traditional anti-loosening device for the clamping piece of the anchorage device consists of a pressing plate and hollow bolts arranged at the rear end of the clamping piece of each anchorage unit, wherein the pressing plate is fastened on the anchorage plate through bolts, and the hollow bolts penetrate through holes formed in the pressing plate to tightly prop against the rear end of the clamping piece, so that the effect of preventing the clamping piece from loosening is achieved. The conventional anti-loosening device is based on the fact that all clamping pieces are positioned in an anchor body, and based on the actual condition that single anchor cable force monitoring is implemented in a group anchor, shan Maosuo force monitoring devices are attached to monitored steel strands by taking the group anchor 3 as a counterforce seat, the clamping pieces of the monitored steel strands are separated from the body of the group anchor 3, the steel strands (namely, a single anchor steel strand 10 b) are anchored by utilizing the single-hole anchor 7 to combine the clamping pieces outside the body, and the single-hole anchor 7 outside the body transmits the steel strand tensioning force to the body of the group anchor 3 by taking the single-anchor cable force gauge 6 and the plum blossom gaskets 5 as carriers. Because the clamping pieces of the group anchor steel stranded wires 10a are all positioned in the anchor body, the clamping pieces of the single anchor steel stranded wires 10b monitored by the cable force are positioned outside the body, so that the clamping pieces of the two types of steel stranded wires are in the state of the same direction and different surfaces, the traditional anti-loosening device of the clamping pieces of the anchor cannot be suitable for the case, under the background, the anti-loosening device of the traditional clamping pieces of the anchor is used as the basis, the anti-loosening device of the clamping pieces of the group anchor is developed, the clamping pieces of the group anchor are separated from the group anchor 3 in the device, the clamping pieces are moved backwards along the direction of the steel stranded wires, the clamping pieces are fastened on the anchor outside the body through bolts, the jacking pipe 4 is arranged between the clamping pieces of the group anchor 3 and the separated clamping pieces, the limiting effect of the external anti-loosening clamping pieces 8 and the hollow bolts 9 on the internal and external clamping pieces of the anchor is regulated by the jacking pipe 4, the (S-1) pieces of the group anchor steel stranded wires 10 a) penetrate into the (S-1) 4, the clamping pieces are screwed through the hollow bolts 9, the clamping pieces are compressed into the anchor holes through the hollow bolts, the clamping pieces of the single clamping pieces Kong Mao, each clamping piece is compressed through the hollow bolts 9, and each clamping piece is compressed by the method, and the clamping pieces can be compressed independently, and the clamping pieces can be compressed and have a high stress value under the conditions, and can be effectively and effectively prevented from being compressed under the conditions.
The jacking pipe 4 is a circular pipe, and the length, the diameter and the pipe wall thickness of the jacking pipe need to satisfy the following formula:
L≥B+C+D+20
d Inner part ≥d Steel strand +1,d Outer part ≤d Hole(s)
δmin≤δ≤δmax
wherein L is the length (mm) of the jacking pipe 4, B is the thickness (mm) of the quincuncial spacer 5, C is the length (mm) of the single-anchor cable gauge 6, D is the length (mm) of the single-hole anchor 7, D Inner part is the inner diameter (mm) of the jacking pipe 4, D Outer part is the outer diameter (mm) of the jacking pipe 4, D Steel strand is the nominal diameter (mm) of the steel strand, D Hole(s) is the diameter (mm) of the large-head anchor hole on the anchor, delta is the thickness (mm) of the jacking pipe 4, delta min is the minimum thickness (mm) of the jacking pipe 4, delta max is the maximum thickness (mm) of the jacking pipe 4, F is the total tensile force (N) of the steel strand, The stability coefficient of the jacking pipe 4 is that S is the total number of steel strands, and [ sigma ] is the design strength (MPa) of the jacking pipe 4.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (8)
1. The method for monitoring the installation of the single-anchor cable gauge of the steel strand based on the group anchor condition is characterized by comprising the following steps:
S1, enabling a group anchor steel strand (10 a) and a single anchor steel strand (10 b) to pass through an anchor backing plate (2) and a group anchor (3) according to a designated sequence, installing an anchor clamping piece (3 a) on the group anchor steel strand (10 a), tightly jacking the anchor clamping piece (3 a) towards the inside of the group anchor (3), cutting off the redundant lengths of the group anchor steel strand (10 a) and the single anchor steel strand (10 b), penetrating into a hydraulic jack (12) and a limiting plate, penetrating into a tool anchor at the outer side of the hydraulic jack (12), installing a tool clamping piece on the group anchor steel strand (10 a) corresponding to a tool anchor hole position, and jacking the tool clamping piece, wherein the single anchor steel strand (10 b) penetrates into a corresponding hole position on the tool anchor;
s2, tensioning the whole bundle of the group anchor steel strands (10 a) to a designed tensile force through a hydraulic jack (12), and then, shrinking a cylinder through the hydraulic jack (12) to enable an anchor clamping piece (3 a) on the group anchor (3) to follow up the locking group anchor steel strands (10 a), and tensioning the group anchor steel strands (10 a) after the hydraulic jack (12) and a tool anchor are removed;
s3, penetrating a Shan Maosuo force monitoring mechanism on the single-anchor steel strand (10 b) and enabling the single-anchor steel strand force monitoring mechanism to be clung to the surface of the group anchor (3), then installing a single Kong Mao jack (13) on the outer side of the single-anchor steel strand force monitoring mechanism to stretch the single-anchor steel strand (10 b), tightly pushing a single-hole anchor working clamping piece to the inner part of the single-anchor steel strand force monitoring mechanism after stretching to a designed tensile force, controlling a cylinder shrinkage of the single Kong Mao jack (13) to enable the single Kong Mao working clamping piece to lock the single-anchor steel strand (10 b), supporting the group anchor (3) as a counterforce, enabling the stretching force on the single-anchor steel strand (10 b) to be transmitted to background integrated data through a wire on the Shan Maosuo force monitoring mechanism, and completing installation of the Shan Maosuo force monitoring mechanism and stretching of the single-anchor steel strand (10 b) after removing the single Kong Mao jack (13) and a tool anchor;
s4, penetrating a jacking pipe (4) into a group anchor steel strand (10 a), enabling one end of the jacking pipe (4) to prop against an anchor clamping piece (3 a) in a hole of a corresponding group anchor (3), penetrating an anti-loosening pressing plate (8) and a hollow bolt (9) according to the principle that hole site arrangement corresponds to a working anchor one by one, tightly propping against the other end of the jacking pipe (4), and then screwing the hollow bolt (9) to enable the jacking pipe (4) to tightly press the anchor clamping piece (3 a) into the hole of the group anchor (3), wherein a single Kong Mao working clamping piece is pressed by the hollow bolt (9) in the same mode;
S5, carrying out real-time monitoring on the tension force of the single-anchor steel strand (10 b) by utilizing a Shan Maosuo force monitoring mechanism, supplementing the tension of the single-anchor steel strand (10 b) when prestress loss occurs due to long-term holding, dismantling an anti-loosening pressing plate (8), a hollow bolt (9) and a jacking pipe (4) before secondary tensioning of the group-anchor steel strand (10 a) and the single-anchor steel strand (10 b), enabling the single-anchor steel strand (10 b) to pass through the center of a supporting frame (11) and enabling the supporting frame (11) to be supported on an anchor backing plate (2), and selecting a single Kong Mao jack (13) to stretch the single-anchor steel strand (10 b) until the Shan Maosuo force monitoring mechanism and the group-anchor (3) are loosened by taking the supporting frame (11) as a counterforce medium;
S6, placing movable clamping pieces in anchor holes of the group anchor (3) corresponding to the single anchor steel strands (10 b), removing single Kong Mao working clamping pieces at the same time, starting to put the single-hole anchor jack (13) to enable the movable clamping pieces in the anchor holes of the group anchor (3) to lock the single anchor steel strands (10 b) in a follow-up manner, and finally removing the single-hole anchor jack (13), the supporting frame (11) and the single-anchor cable force monitoring mechanism;
S7, repeating the step S02, secondarily tensioning the group anchor steel stranded wires (10 a) to a design value by utilizing the hydraulic jack (12) and anchoring, and then removing the hydraulic jack (12);
S8, penetrating Shan Maosuo a force monitoring mechanism on the single-anchor steel stranded wire (10 b), wherein a single-hole anchor working clamping piece is not installed on the single-anchor force monitoring mechanism, referring to steps S5 to S6, after installing a supporting frame (11), selecting a single Kong Mao jack (13) to stretch the single-anchor steel stranded wire (10 b), enabling the single-anchor steel stranded wire (10 b) to withdraw anchors from movable clamping pieces on the group anchor (3), removing anchor clamping pieces (3 a), adjusting the single Kong Mao jack (13) to a designed pulling force, installing the single Kong Mao working clamping piece on the single-anchor force monitoring mechanism, then shrinking a cylinder of the single-hole anchor jack (13), enabling the single Kong Mao working clamping piece on the single-anchor force monitoring mechanism to lock the single-anchor steel stranded wire (10 b), converting the pulling force on the single-anchor steel stranded wire (10 b) into the pressure on the single-anchor force monitoring mechanism, and transmitting the pressure on the single-anchor steel stranded wire to background integrated data through wires on the Shan Maosuo force monitoring mechanism;
S9, finishing the secondary tensioning stress conversion of the Shan Maosuo force monitoring mechanism after removing the single Kong Mao jack (13) and the support frame (11), penetrating a jacking pipe (4), an anti-loosening pressing plate (8) and a hollow bolt (9) on the group anchor steel stranded wire (10 a) in the same manner as in the step S4, and tightly pressing clamping pieces on the group anchor (3) and the single anchor force monitoring mechanism into anchor holes by screwing the hollow bolt (9) to finish the secondary tensioning of the group anchor steel stranded wire (10 a) and the single anchor steel stranded wire (10 b) and the secondary conversion of the single anchor force monitoring;
S10, repeating the steps S5 to S9, monitoring the cable force of the steel strands in real time by using a Shan Maosuo force monitoring mechanism, and carrying out subsequent re-tensioning and circulating operation of the group anchor steel strands (10 a) and the single anchor steel strands (10 b) according to engineering requirements.
2. The method for monitoring the installation of the single-anchor cable gauge based on the steel strands under the group anchor condition according to claim 1, wherein the single-anchor cable force monitoring mechanism comprises a quincuncial gasket (5), a single-anchor cable force gauge (6) and a single-hole anchor (7), the single-anchor cable force gauge (6) comprises an anchor cable sensor placed on the quincuncial gasket (5), the pressure on the single-hole anchor (7) is transmitted to the anchor cable sensor through the Shan Maosuo force gauge (6), and a pressure signal monitored by the anchor cable sensor is transmitted to the background through a wire on the Shan Maosuo force gauge (6).
3. The method for monitoring the installation of the single-anchor cable gauge of the steel strand under the group-anchor condition according to claim 2, wherein the step S3 specifically comprises the following steps:
the single-anchor steel strand (10 b) is sequentially penetrated into the quincuncial spacer (5), the single-anchor cable force gauge (6), the single Kong Mao (7) and the single-hole anchor working clamping piece, the quincuncial spacer (5) is tightly attached to the surface of the group anchor anchorage device (3), then the single Kong Mao jack (13) is arranged on the outer side of the single-hole anchor (7) to stretch the single-anchor steel strand (10 b), the tool anchor is arranged on the outer side of the single Kong Mao jack (13), after the single-hole anchor working clamping piece is tightly pushed to the inner side of the single Kong Mao (7) after the single-hole anchor steel strand is stretched to a designed pulling force, the single Kong Mao jack (13) is controlled to shrink the cylinder, the single Kong Mao working clamping piece is used for locking the single-anchor steel strand (10 b), the single Kong Mao (7) is used for back-pressing the Shan Maosuo force gauge (6) to transfer the pulling force to the anchor cable sensor and the quincuncial spacer (5), and finally the pulling force on the single-anchor steel strand (10 b) is transferred to a back table through a wire on the Shan Maosuo force gauge (6) to integrate data, and the single-anchor jack (Shan Maosuo) and the single-anchor steel strand (Shan Maosuo) are removed after the single-anchor gauge (13) is arranged.
4. The method for monitoring the installation of the single-anchor cable gauge of the steel strand under the group-anchor condition according to claim 2, wherein the step S8 specifically comprises the following steps:
The single-anchor steel stranded wire (10 b) is sequentially penetrated into the plum blossom gasket (5), the single-anchor cable force gauge (6) and the single-hole anchor (7), a single Kong Mao working clamping piece is not installed on the single-hole anchor (7), the single-anchor steel stranded wire (10 b) is tensioned by selecting the single Kong Mao jack (13) after the supporting frame (11) is installed, the movable clamping piece on the group anchor (3) is retracted by the single-anchor steel stranded wire (10 b), the anchor clamping piece (3 a) is removed, the single Kong Mao jack (13) is adjusted to design tension, the single Kong Mao working clamping piece is installed on the single-hole anchor (7), then the single-hole anchor jack (13) is retracted, the single-hole anchor (7) is locked by the single-hole anchor cable force gauge (10 b), the tension is transferred to the single-anchor cable force gauge (6), the plum blossom gasket (5) and the group anchor (3) in one step through the single-Kong Mao (7), the tension on the single-anchor steel stranded wire (10 b) is converted into the tension cable mechanism, and the tension is monitored by the single-wire mechanism, and the tension is transferred to the single-cable mechanism through the integrated tension monitoring mechanism.
5. The method for monitoring the installation of the single-anchor cable gauge of the steel strand under the group anchor condition according to claim 2, wherein the supporting frame (11) comprises a supporting plate (11 a), a reinforcing rib (11 c) and a supporting cross beam (11 b);
The steps S5-S6 specifically comprise: carrying out real-time monitoring on the tension force of the single-anchor steel strand (10 b) by utilizing a Shan Maosuo force monitoring mechanism, supplementing the tension of the single-anchor steel strand (10 b) when prestress loss occurs due to long-term holding, dismantling an anti-loosening pressing plate (8), a hollow bolt (9) and a jacking pipe (4) before secondary tensioning of the group-anchor steel strand (10 a) and the single-anchor steel strand (10 b), enabling the single-anchor steel strand (10 b) to penetrate through the center of a supporting frame (11) and enable the supporting frame (11) to be supported on an anchor backing plate (2), taking the supporting frame (11) as a counterforce medium, and selecting a single Kong Mao jack (13) to stretch the single-anchor steel strand (10 b) until the Shan Maosuo force monitoring mechanism and the group-anchor (3) are loosened;
The movable clamping pieces are placed in the anchor holes of the group anchor (3) corresponding to the single anchor steel strands (10 b), meanwhile, the single Kong Mao working clamping pieces on the single Kong Mao (7) are removed, the single-hole anchor jack (13) starts to be placed so that the movable clamping pieces in the anchor holes of the group anchor (3) can lock the single anchor steel strands (10 b) in a follow-up mode, and finally the single-hole anchor jack (13), the supporting frame (11), the single Kong Mao (7) and the plum blossom gaskets (5) are removed.
6. The method for monitoring the installation of the single-anchor cable gauge based on the steel strands under the group anchor condition according to claim 2, wherein the height of the supporting frame (11) is required to meet the following conditions:
H≥A+L+70mm
Wherein H is the clear height of the support frame (11), A is the thickness of the group anchor anchorage device (3), L is the thickness of the plum blossom gasket (5), the length of the single anchor cable force gauge (6) and the length of the single Kong Mao (7), and 70mm is the length of the clamping piece and the stretching reserved space.
7. The method for monitoring the installation of the single-anchor cable gauge based on the steel strands under the group anchor condition according to claim 2 is characterized in that the thickness t of the groove thin wall on the quincuncial gasket (5) is required to meet the following conditions:
e1＜t＜e1+e2
wherein e 1 is the distance from the outer edge of the steel strand to the edge of the anchor hole, and e 2 is the clear distance between adjacent anchor holes.
8. The method for monitoring the installation of the single-anchor cable gauge of the steel strand under the group anchor condition according to claim 2, wherein the jacking pipe (4) is arranged into a circular pipe structure, and the length, the diameter and the pipe wall thickness of the jacking pipe (4) are required to meet the following conditions:
L≥B+C+D+20
d Inner part ≥d Steel strand +1,d Outer part ≤d Hole(s)
δmin≤δ≤δmax
Wherein L is the length of the jacking pipe (4), B is the thickness of the quincuncial spacer (5), C is the length of the single-anchor cable force gauge (6), D is the length of the single-hole anchor (7), D Inner part is the inner diameter of the jacking pipe (4), D Outer part is the outer diameter of the jacking pipe (4), D Steel strand is the nominal diameter of the steel strand, D Hole(s) is the diameter of the large-head anchor hole on the anchor, delta is the thickness of the jacking pipe (4), delta min is the minimum thickness of the jacking pipe (4), delta max is the maximum thickness of the jacking pipe (4), F is the total tensile force of the steel strand, The stability coefficient of the jacking pipe (4) is that S is the total number of steel strands, and [ sigma ] is the design strength of the jacking pipe (4).
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| CN202311741223.9A CN117949130A (en) | 2023-12-18 | 2023-12-18 | Method for monitoring installation of single-anchor cable gauge based on steel strand under group anchor condition |
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| CN202311741223.9A CN117949130A (en) | 2023-12-18 | 2023-12-18 | Method for monitoring installation of single-anchor cable gauge based on steel strand under group anchor condition |
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