CN114088774B - Clamping ring type detection device and detection method for plumpness in grouting stage of anchor cable and rod - Google Patents
Clamping ring type detection device and detection method for plumpness in grouting stage of anchor cable and rod Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 65
- 239000002184 metal Substances 0.000 claims abstract description 31
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- 238000000034 method Methods 0.000 claims abstract description 12
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000004570 mortar (masonry) Substances 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 claims description 8
- 230000000007 visual effect Effects 0.000 claims description 8
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- 239000011440 grout Substances 0.000 claims description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/02—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by gauge glasses or other apparatus involving a window or transparent tube for directly observing the level to be measured or the level of a liquid column in free communication with the main body of the liquid
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Abstract
The invention discloses a clamp ring type detection device and a detection method for plumpness in an anchor cable and rod grouting stage. The device comprises a conductive mesh, a walking catheter, a movable electrode module and a handheld detector, wherein the walking catheter is formed by splicing a plurality of walking sections, and comprises an expanding section, a gradual change section and a reducing section; the movable electrode module consists of a front electrode sleeve and a rear electrode sleeve which are the same and are connected through internode sleeves, and each set of electrode sleeve consists of two metal sleeves, an insulating sleeve and an electrode feeler; the conductive net piece is sleeved on the anchor cable and the rod at equal intervals. In the grouting stage, the movable electrode module is pulled outwards from the hole bottom to move section by section, the resistance value of grouting material is measured by utilizing a conductive loop formed by the diameter-reducing section clamping ring structure and is compared with the standard resistance value in the full state, and then grouting plumpness and the hollow position are judged. The invention overcomes the limitation that the existing method is only suitable for grouting material after coagulation and hardening, and realizes synchronous grouting, slurry supplementing and detection.
Description
Technical Field
The invention relates to a clamp ring type detection device and a detection method for plumpness in an anchor cable and rod grouting stage, and belongs to the technical field of anchor cable (rod) construction.
Background
With the wide application of the anchor spraying support technology in foundation pit, side slope, tunnel and other projects, the grouting quality detection and defect identification of the pore canal are increasingly and commonly paid attention to. Grouting fullness and incompact position of the anchoring system are two key indexes for evaluating whether the anchoring system can exert maximum effect. The adhesive property between the anchor cable (rod) and the mortar directly determines the design of the anchoring length, and the adhesive force mainly comprises 3 parts of chemical adhesive force, friction force and mechanical biting force on the contact surface of the anchor rod and the mortar. When soil layer is not clear, impurities such as ponding, soil or rock scraps are left in the holes, slurry or local cement soil are inevitably clamped in grouting materials, and under the action of elastic bending deformation, anchor bars can be clung to or sink into the hole walls under the conditions of loose hole walls, unbending drilling, deflection of lower anchors and the like, so that local slurry-free packages are caused. When the defects of honeycomb, segregation, hollowness and the like occur in the mortar, the surface of the rib body is easy to be locally adhered with mud residue or mud skin to reduce the bonding strength, so that the bonding strength and bond strength are invalid, and particularly the prestressed anchor cable (rod) anchoring system can be corroded or even broken in the service process, thereby causing potential safety hazard. It can be seen that whether the mortar is full directly affects the durability and stability of the shotcrete support engineering. Therefore, it is generally necessary to perform a pull-out test or a nondestructive test of compactness, such as an acoustic stress wave, for an engineering anchor cable (rod); however, these methods are only applicable after hardening of the slurry, and if the grouting is found to be not dense, the slurry cannot be fed.
The anchor cable site construction is usually carried out by taking the hole opening without exhausting, and the hole opening overflow slurry or grouting rate is lower than a certain value as a standard for the end of grouting, however, the delay judgment of the grouting amount is easy to cause that the actual slurry consumption is larger than the theoretical consumption. In addition, for weak stratum, the phenomenon that the drilling hole is not formed well and the gap cannot be filled by the slurry stop plug is easy to generate the problems of slurry overflow, slurry leakage and poor plugging, and the grouting under pressure can not reach the preset pressure.
At present, the detection of the mortar fullness in the grouting stage is mainly aimed at sleeve grouting at the joint of the assembled building steel bars. Chinese patent (CN 201910688408.5) discloses a grouting fullness monitoring device for an assembled concrete structure steel bar sleeve, which accurately measures the real-time fullness state in the grouting process of the grouting material according to the relationship between the height of the grouting material liquid surface in the sleeve and the length of the submerged hydrophobic electrode. However, such devices are mainly directed to small sleeves for fabricated constructions, and are not suitable for use with elongate structures such as anchor rods (cables). The Chinese patent (CN 202110078459.3) discloses an intelligent grouting sleeve and a saturation and damage position detection device and method thereof, wherein a detection device is formed by connecting a conducting strip, a power supply and a universal meter in series, the resistance of grouting material can be detected by utilizing a formed conducting loop after the conductive grouting material is injected, and the saturation and unsaturated positions of the grouting material can be detected according to resistance values of different positions. However, the device is mainly directed to small sleeves for fabricated constructions, and is not applicable to elongate structures such as anchor rods (cables). The Chinese patent (CN 201810661760.5) discloses a device for early warning grouting positions in anchor cable construction and a construction method thereof, wherein the device is provided with an elastic structure arranged at a demarcation position and a pressure detection structure connected with the elastic structure, so that the pressure at the elastic structure is detected in real time, and an alarm is sent out when the pressure changes to prompt the stop of grouting. The device has realized the detection to the slip casting position, but structural style is comparatively complicated and the cost is higher, is inconvenient for on-the-spot large tracts of land popularization.
Disclosure of Invention
Based on the above, the invention provides the clamp ring type detection device and the clamp ring type detection method for the plumpness of the anchor cable and the rod in the grouting stage, which can synchronously perform grouting and detection, so as to solve the problem that the prior art is only suitable for detection after grouting material is coagulated and hardened.
The technical scheme of the invention is as follows: a clamp ring type detection device for plumpness in grouting stage of anchor cable and rod comprises:
the plane of the conductive mesh is provided with a conduit hole, a grouting hole, an anchor bar hole, an inner insulation hole and an outer insulation ring; the inner insulating ring is annularly arranged on the anchor bar holes, a plurality of conductive meshes are sleeved on the anchor cable and the rod at intervals through the anchor bar holes, and the anchor cable and the rod are positioned in the drilled holes.
The walking guide pipe is a hollow circular pipe and is formed by splicing a plurality of walking sections along the axial direction of a drilling hole in sequence, the walking sections are arranged between adjacent conductive meshes, the walking sections are an expanding section, a gradual change section and a reducing section from the middle part to the two sides in sequence, the expanding section and the gradual change section are made of insulating materials, and the reducing section is made of conductive materials and is clamped in the guide pipe hole.
The length of the movable electrode module is the same as that of the running section, the movable electrode module comprises two electrode sleeves, an internode sleeve and a traction rope, the internode sleeve is connected between the two electrode sleeves, the electrode sleeves and the internode sleeve can be arranged in the catheter hole in a penetrating mode and are connected with the traction rope, the electrode sleeves comprise two metal sleeves and an insulating sleeve, the metal sleeves are respectively connected with an electrode lead, the insulating sleeve is connected between the two metal sleeves, and electrode tentacles are arranged on the electrode sleeves.
The handheld detector comprises a binding post, a change-over switch, a signal detection module, a data processing module, an audible-visual alarm module, a liquid crystal display module, a display screen, an LED alarm lamp and a buzzer alarm, wherein the binding post is connected with an electrode lead, the change-over switch is connected with the signal detection module, the signal detection module is connected with the data processing module, the data processing module is respectively connected with the audible-visual alarm module and the liquid crystal display module, the audible-visual alarm module is respectively connected with the LED alarm lamp and the buzzer alarm, and the display screen is connected with the liquid crystal display module.
Optionally, the number of the binding posts is 4, the binding posts are respectively connected with 4 electrode leads (118) of the two electrode assemblies (11), the change-over switch (42) comprises 0 gear, 1 gear, 2 gear and 3 gear, the 0 gear represents that a power supply is disconnected, the 1 gear represents that two electrode leads (35) of the same electrode sleeve (31) are connected with the signal detection module (47), the 2 gear represents that two electrode leads (35) of the two electrode sleeves (31) are connected with the signal detection module (47), and the 3 gear represents that the other two electrode leads (35) of the two electrode sleeves (31) are connected with the signal detection module (47).
Optionally, the conductive mesh is a circular metal mesh with a plurality of round holes, the diameter is smaller than that of the drilled holes, an outer insulating ring is arranged on the periphery of the conductive mesh, and the outer insulating ring is provided with supports at equal angular intervals along the circumferential direction of the conductive mesh.
Optionally, the electrode sleeve comprises two metal sleeves and an insulating sleeve, the metal sleeves are respectively connected with the electrode leads, the insulating sleeve is connected between the two metal sleeves, the electrode tentacles are arranged outside the metal sleeves at intervals along the circumferential direction, the diameter of the electrode sleeve is smaller than the inner diameter of the diameter-reduced section, and the opening height of the electrode tentacles is larger than the inner diameter of the diameter-reduced section; in a natural state, the electrode tentacles are loosened and opened, and in the necking section, the communication circuit is tightened and moves through.
Optionally, the electrode tentacles are claw-type cranks facing the same side, and the electrode tentacles are alternately arranged on the circumferential surfaces of the two metal sleeves at intervals.
Optionally, the handheld detector further comprises a power circuit, a reset circuit, a crystal oscillator circuit, an E2PROM memory module and a USB interface, wherein the power circuit, the reset circuit, the crystal oscillator circuit and the E2PROM memory module are connected with the data processing module.
Optionally, the grouting observation assembly further comprises a grouting observation assembly, the grouting observation assembly comprises:
the grout stop plug is used for penetrating the anchor cable and the rod and is positioned at the separation position of the drilling anchoring section and the free section;
the flexible water bag is arranged on one side, close to the outside of the drilling hole, of the grout stop plug;
one end of the liquid level pipe is communicated with the flexible water bag, and the other end of the liquid level pipe extends out of the drilled hole along the anchor cable and the rod; and stopping grouting when the liquid level in the liquid level pipe obviously rises in the grouting process.
Optionally, the flexible water bag is filled with colored liquid.
The invention also provides a detection method of the clamp ring type detection device for the plumpness of the anchor cable and the rod in the grouting stage, which comprises the following steps:
s1, before detecting grouting fullness of a drilling hole, preparing a plastic cylinder with the same diameter and height as those of the drilling hole and the same distance as those of conductive meshes in the drilling hole outside the drilling hole, fixing the conductive meshes at the upper end and the lower end, saturating and pouring slurry with the same property as that of the grouting material of the drilling hole, measuring the resistance value of the slurry by adopting a conventional universal meter as a standard resistance value, and reserving the standard resistance value as a subsequent comparison;
s2, hooping the conductive meshes on anchor cables and rods at equal intervals, then penetrating the running sections into the duct holes of two adjacent conductive meshes, and sequentially connecting the adjacent conductive meshes to form the running duct with the same drilling length;
s3, placing the movable electrode module at the tail end of the walking catheter, winding the front electrode lead and the rear electrode lead on the traction rope, laying along the walking catheter, leading out the outside of the holes, and numbering at the wire head in sequence;
s4, penetrating a grouting pipe into the grouting hole on the conductive mesh, wherein the pipe orifice end and the movable electrode module are positioned at the bottom end together;
s5, placing anchor cables and rods together with the conductive mesh, the running guide pipe, the movable electrode module and the grouting pipe into a drill hole;
s6, grouting is carried out by adopting a hole bottom slurry returning method, grouting is stopped when the liquid level of the liquid level pipe is obviously increased, the 4 electrode leads are respectively connected with the binding posts corresponding to the handheld detector, meanwhile, the change-over switch is rotated to 1 grade, and the traction rope is pulled towards the hole opening so as to drive the movable electrode module to slowly move;
s7, when the LED alarm lamp and the buzzer alarm detect that the electrode feeler is in contact with the conductive mesh, the movable electrode module is stopped being pulled, the change-over switch is rotated to 2 nd gear and 3 rd gear in sequence, the resistance value of the grouting material of the section is measured and recorded, and the resistance value is displayed on the display screen;
s8, comparing the measured resistance value of the segment with a standard resistance value, and when the measured value is smaller than the standard value, indicating that the segment grouting material is not full; otherwise, the compactness of the mortar reaches the requirement;
and S9, when the drilling hole is not full, secondary grouting can be performed, and after the requirement is met, the steps S6-S8 are repeated, and the operation of the next section is performed until the grouting and detection of the whole drilling hole are completed.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can detect the plumpness and the hollow position of grouting materials in the grouting stage of the anchor cable and the rod, overcomes the limitation that the existing detection method is only suitable for the solidification and hardening of mortar, and realizes synchronous grouting, slurry supplementing and detection.
2. By arranging the audible and visual alarm function in the handheld detector, the contact state of the electrode and the arc sliding surface of the conducting strip can be accurately judged, a basis is provided for determining the time of resistance measurement, and the detection efficiency is high, the speed is high, and the operation is simple, convenient and rapid.
3. According to the invention, the traditional probe point contact mode is changed into the surface contact mode by arranging the conductive mesh, the measured resistance value can reflect the whole grouting condition of the whole section, and meanwhile, the conductive mesh also plays a role of a traditional anchor cable centering isolation bracket.
4. The invention can intuitively judge whether slurry leakage and slurry overflow exist or not by observing the change of the liquid level surface outside the drilling hole, and prompts the end of slurry injection, thereby avoiding excessive injection of slurry consumption.
Drawings
FIG. 1 is a schematic diagram of a grouting fullness detecting device;
FIG. 2 is a schematic view of a walking catheter;
FIG. 3 is an overall view of a mobile electrode module;
FIG. 4 is a side view of a moving electrode;
fig. 5 is a front elevation view of the conductive mesh;
FIG. 6 is a cross-sectional view of a front electrode antenna;
FIG. 7 is a cross-sectional view of a rear electrode antenna;
FIG. 8 is a schematic diagram of a hand-held detector;
FIG. 9 is a schematic diagram of the circuit connections of the handheld detector;
in the figure:
1, a conductive mesh;
the device comprises a guide pipe hole 11, a grouting hole 12, an anchor bar hole 13, a metal mesh 14, an inner insulating ring 15, an outer insulating ring 16 and a support 17;
2, running the catheter;
21, 22, 23;
3, moving the electrode module;
31 electrode sleeve, 32 internode sleeve, 33 traction rope, 34 electrode tentacles; 35 electrode leads;
311 metal sleeve, 312 insulating sleeve;
4. a hand-held detector;
41 binding post, 42 change-over switch, 43 LED alarm lamp, 44 buzzer alarm, 45 USB interface, 46 display screen, 47 signal detection module, 48 power supply circuit, 49 reset circuit, 410 crystal oscillator circuit, 411 audible and visual alarm module, 412E 2 PROM memory module, 413 LCD module, 414 data process module;
5 grouting observation components;
51, a slurry stop plug, 52, a flexible water bag and 53 liquid level pipes;
6, drilling holes;
7, anchor cables and rods;
8 grouting material;
9. soil layer.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit or scope of the invention, which is therefore not limited to the specific embodiments disclosed below.
Referring to fig. 1 to 9, a clamp ring type detection device for plumpness in a grouting stage of an anchor cable and a rod according to the present embodiment includes a conductive mesh 1, a traveling catheter 2, a movable electrode module 3, a grouting observation assembly 5 and a handheld detector 4.
The conductive mesh 1 is mainly used for contacting with mortar. The conductive mesh (1) is mainly made of a metal mesh, and a conduit hole 11, a grouting hole 12, an anchor bar hole 13, an inner insulating ring 15 and an outer insulating ring 16 are arranged on the plane of the conductive mesh, wherein the anchor bar hole 13 is used for being arranged on an anchor cable and a rod 7 in a penetrating way, and the inner insulating ring 15 is annularly arranged on the anchor bar hole 13 to prevent the anchor cable and the rod 7 from forming a conductive loop with a reduced diameter section 23 of a running conduit.
Preferably, the conductive mesh 1 is disc-shaped, has a diameter smaller than that of the drilled hole, is provided with an outer insulating ring 16 on the periphery thereof, and is provided with supports 17 at equal intervals along the circumferential direction of the outer insulating ring 16; these supports 17 may be insulating support blocks, which enable a relative tightening of the conductive mesh 1 with the borehole 6, avoiding displacement thereof.
The travelling catheter 2 provides a guiding space for the slow movement of the movable electrode module 3, and can slowly pull the movable electrode module 3 to move according to a preset direction. The running guide pipe 2 is a hollow circular pipe and is formed by splicing a plurality of running sections along the axial direction of a drilling hole in sequence, the total length of the running guide pipe 2 is the total length of the drilling hole, the running guide pipes 2 are sequentially arranged between two adjacent conductive meshes 1, the running guide pipe 2 is formed by sequentially arranging an expanding section 21, a gradual change section 22 and a reducing section 23 from the middle part to two sides, the expanding section 21 and the gradual change section 22 are made of insulating materials, and the reducing section 23 is made of conductive materials and is clamped in the guide pipe hole 11. The diameters of the expanded diameter section 21, the gradually changed section 22 and the reduced diameter section 23 decrease in order. In this embodiment, the diameter-reducing section 23 may be made of a metal material, and the diameter-enlarging section 21 and the transition section 22 are made of a plastic material.
The movable electrode module 3 is mainly used for forming a conductive loop in movable contact with the conductive mesh 1, has the same length as the length of the travelling catheter 2, and comprises two electrode sleeves 31, an internode sleeve 32 and a traction rope 33, wherein the internode sleeve 32 is connected between the two electrode sleeves 31, an electrode feeler 34 is arranged on the electrode sleeve 31, the electrode sleeve 31 and the internode sleeve 32 can be arranged in the catheter hole 11 in a penetrating manner and connected with the traction rope 33, the movable electrode module 3 can be pulled to move in the travelling catheter 2 through the traction rope 33, and when the movable electrode module 3 moves between two adjacent conductive meshes 1, and the two electrode feelers 34 are just in contact connection with the diameter reduction section 23, the conductive loop can be formed. In this embodiment, the internode is made of a non-conductive material.
Preferably, the electrode sleeve 31 comprises two metal sleeves 311 and an insulating sleeve 312, the metal sleeves 311 are respectively connected with the electrode leads 35, the insulating sleeve 312 is connected between the two metal sleeves 311, the electrode tentacles 34 are arranged outside the metal sleeves 311 at intervals, the diameter of the electrode sleeve 31 is smaller than the inner diameter of the diameter-reduced section 23, and the opening height of the electrode tentacles 34 is larger than the inner diameter of the diameter-reduced section 23, so that the electrode tentacles 34 can be in close contact with the diameter-reduced section 23 when passing through the diameter-reduced section 23, and the connection quality is improved. And the electrode tentacles 34 are arranged on the front metal sleeve and the rear metal sleeve, so that the connection reliability of the electrode tentacles 34 when moving to the diameter-reduced section 23 can be further ensured, and whether the electrode tentacles 34 are in contact with the conductive mesh 1 or not can be conveniently judged. In this embodiment, the electrode tentacles 34 have a smaller opening height than the diameter-enlarging section 21, and when moving from the diameter-enlarging section to the diameter-reducing section 23, the electrode tentacles 34 are gradually compressed under the action of the transition section, and finally are compressed and contracted in the diameter-reducing section 23 to achieve close contact. In this embodiment, the metal sleeve 311, the insulating sleeve 312 and the inter-joint sleeve 32 are hollow round tubes with equal diameters and are connected by threads.
Preferably, the electrode feelers 34 are elastic claw-type cranks facing the same side, and the electrode feelers 34 are alternately arranged on the circumferential surfaces of the two metal sleeves 311 at intervals. This structure can further improve the reliability of the electrode feeler 34 when passing through the reduced diameter section 23. In this embodiment, the electrode tentacles 34 face the bottom of the borehole, and each metal sleeve 311 is integrally and uniformly connected with four electrode tentacles 34, and is uniformly arranged at 90-degree intervals along the circumferential direction, and the front row and the rear row are staggered at an angle of 45 degrees.
The handheld detector 4 is used for being connected with 4 electrode leads 118 in the elastic electrode module 1, and is mainly used for monitoring whether the electrode probe 112 is in contact with the conductive mesh 2 or not and measuring the resistance value of the grouting material 6. In the embodiment, a body of the handheld detector 4 is provided with a binding post 41, an LED alarm lamp 43, a buzzer alarm 44, a change-over switch 42, a USB interface 45 and a display screen 46; the body is also provided with a signal detection module 47, a power circuit 48, a reset circuit 49, a crystal oscillator circuit 410, an audible and visual alarm module 411 and E 2 PROM memory module 412, liquid crystal display module 413 and data processing module 414. The binding post 41 and the change-over switch 42 are connected with the signal detection module 47; the LED alarm lamp 43 and the buzzer alarm 44 are connected with the audible and visual alarm module 411; the display screen 46 is connected with the liquid crystal display module 413; the signal detection module 47, the power circuit 48, the reset circuit 49, the crystal oscillator circuit 410, the audible and visual alarm module 411 and E 2 The PROM memory module 412 and the liquid crystal display module 413 are connected to the data processing module 414.
Preferably, the change-over switch comprises four gears "0,1,2, 3". In the present embodiment, "0" represents power off, "1" represents that the terminals 1 and 2,3 and 4 are respectively connected to form the judgment circuit, "2" represents that the terminals 1 and 4, 2 and 3 are respectively connected to form the measurement circuit. In operation, the handle is rotated clockwise in fig. 6 to cause the contacts to close or open in a prescribed sequence. The detection circuit is used for identifying the contact state of the electrode feeler 34 and the conductive mesh 1. When the LED lamp 43 is lightened and the buzzer alarm 42 sounds, the electrode feeler 34 is indicated to be in contact with the conductive mesh 1, so that a conductive loop with measurable resistance is formed; when the LED lamp 43 is dim or extinguished and the buzzer alarm 42 is not loud, it indicates that the two are in a separated state. The detection principle is that when the electrode feeler 34 is not contacted with the reduced diameter section 23, the resistance between the front electrode feeler and the rear electrode feeler on the same electrode sleeve 31 is larger, so that the current of a detection circuit is small, the indicator lamp 43 is dim or not bright, and the alarm 42 cannot be driven to generate alarm sound; when the electrode feeler 34 is in contact with the reduced diameter section 23, the resistivity is small because both are made of metal materials, and the indicator light is brighter at the moment and sounds with a buzzing alarm.
Preferably, the signal acquisition circuit 47 is switched to different gear positions through the change-over switch 44 to form the detection and measurement circuit, and the resistance value of each section of grouting material is transmitted to the data processing module 410 for analysis, the data result after analysis is displayed on the liquid crystal display 45, and the filling degree of grouting is automatically judged after the data result is compared with the standard resistance value. In this embodiment, the 2 and 3 gear positions measure the resistance values of the same segment grouting material, and the measured data are compared and verified with each other, and stored in the handheld detector 4 through the data storage circuit 49, and can be derived through the USB interface 46 in the later stage.
Preferably, the data processing module 414 can be an STC89C52 singlechip, and adopts I 2 C communication pair E 2 The PROM memory module 412 performs data access, and uses UART or CAN communication to realize information interaction with the liquid crystal display module 413; the signal detection module 47 comprises sampling resistor, voltage dividing circuit, operational amplifier, auxiliary power supply, capacitor, etc.; the contact judgment and resistance measurement are carried out by switching to different gears through the change-over switch 42; the data processing module 414 calculates the resistance value of each section of grouting material 6 according to the current value on the sampling resistor, and compares and analyzes the resistance value with the standard resistance value to judge the filling degree of grouting; the measured values and the analysis result are then transferred to the liquid crystal display module 413 and stored in E 2 PROM data storage module 412. In the embodiment, the 2 and 3 gears measure the resistance of the same segment of grouting material 6, and the measured data are compared and verified with each other through E 2 The PROM data storage module 412 is stored in the handheld detector 4 and can be exported later through the USB interface 45.
Preferably, the detection device also comprises a grouting observation assembly 5, wherein the grouting observation assembly 5 comprises a grouting stop plug 51, a flexible water bag 52 and a liquid level pipe 53, the grouting stop plug 51 is arranged on the anchor cable and the rod 7 in a penetrating way and is positioned at the separation position of the drilling anchoring section and the free section, so that slurry is prevented from flowing back out of the outflow hole along the drilling during grouting, and the grouting stop effect is realized; the flexible water bag 52 is arranged on one side of the grout stop 51, which is close to the outside of the drilling hole 6, one end of the liquid level pipe 53 is communicated with the flexible water bag 52, and the other end extends to the outside of the drilling hole 6 along the anchor cable and the rod 7. When the wall of the drilling hole is not sealed, and grouting in the anchoring section is completed, grouting material flows into the free section from gaps between the grouting stop plug 51 and the periphery of the wall of the drilling hole, and the flexible water bag 52 is extruded, so that the liquid level in the liquid level pipe 53 rises, whether slurry leakage and slurry overflow occur can be judged according to the rising degree of the liquid level, and the grouting is finished. In this embodiment, the liquid level bag is filled with a colored liquid, so as to facilitate observation.
The detection method of the clamp ring type detection device for the plumpness of the anchor cable and the rod in the grouting stage of the embodiment comprises the following steps:
s1, before the grouting fullness of a drilling hole is detected, preparing a plastic cylinder with the same diameter and height as those of the drilling hole and the distance between the conductive meshes (1) in the drilling hole outside the drilling hole, fixing the conductive meshes (1) at the upper end and the lower end, saturating and filling slurry with the same property as that of the grouting material of the drilling hole, measuring the resistance value of the slurry by using a conventional multimeter as a standard resistance value, and reserving the standard resistance value as a subsequent comparison. In this embodiment, the electrode leads connected to the front and rear metal bushings are respectively numbered, e.g., 1,2 and 3, 4, respectively, and correspondingly, the 4 binding posts are marked with different colors, e.g., two red colors and two yellow colors, respectively corresponding to the electrode leads 1,2 and 3, 4.
S2, hooping the conductive meshes 1 on anchor cables and rods 7 at equal intervals, then penetrating the running guide pipes 2 into the guide pipe holes 11 of two adjacent conductive meshes 1, and sequentially connecting the two adjacent conductive meshes 1 to form the running guide pipes 2 with the same drilling length;
s3, placing the movable electrode module 3 at the tail end of the walking guide tube 2, winding the front and rear four electrode leads 35 on the traction rope 33, and arranging along the walking guide tube 2 to be led out of the holes;
s4, a grouting pipe is arranged in the grouting hole 12 on the conductive net sheet 1 in a penetrating way, and the pipe orifice end and the movable electrode module 3 are positioned at the bottom end together;
s5, placing anchor cables, rods 7, the conductive mesh 1, the running guide pipe 2, the movable electrode module 3 and the grouting pipe into a drill hole;
s6, grouting is carried out by adopting a hole bottom slurry returning method, grouting is stopped when the liquid level of the liquid level pipe 53 rises obviously, the 4 electrode leads 35 are respectively connected with the binding posts 41 corresponding to the handheld detector 4, meanwhile, the change-over switch 44 is rotated to 1 grade, and the traction rope 33 is pulled towards the hole opening so as to drive the movable electrode module 3 to move slowly;
s7, when the LED alarm lamp 43 and the buzzer alarm 42 detect that the electrode feeler 34 is in contact with the conductive mesh 1, the movable electrode module 3 is stopped to be pulled, the change-over switch 44 is rotated to 2 nd gear and 3 rd gear in sequence, the resistance value of the grouting material of the segment is measured and recorded, and the resistance value is displayed on the display screen 46;
s8, comparing the measured resistance value of the segment with a standard resistance value, and when the measured value is smaller than the standard value, indicating that the segment grouting material is not full; otherwise, the compactness of the mortar reaches the requirement;
and S9, when the drilling hole is not full, secondary grouting can be performed, and after the requirement is met, the steps S6-S8 are repeated, and the operation of the next section is performed until the grouting and detection of the whole drilling hole are completed.
In summary, the invention provides a clamp ring type detection device and a detection method for plumpness in the grouting stage of an anchor cable and a rod. The device comprises a conductive mesh sheet 1, a walking guide pipe 2, a movable electrode module 3 and a handheld detector 4, wherein the walking guide pipe 2 is formed by splicing a plurality of walking sections, and comprises an expanded diameter section 21, a gradual change section 22 and a contracted diameter section 23; the movable electrode module 3 consists of a front electrode sleeve 31 and a rear electrode sleeve 31 which are the same and are connected through an internode sleeve 32, and each electrode sleeve consists of two metal sleeves 311, an insulating sleeve 312 and an electrode feeler 34; the conducting strip is a circular metal net sheet with a plurality of round holes, and is sleeved on the anchor cable and the rod at equal intervals. In the grouting stage, the movable electrode module 3 is pulled outwards from the hole bottom to move section by section, the resistance value of grouting material is measured by utilizing a conductive loop formed by a reducing section snap ring structure, and the resistance value is compared with a standard resistance value in a full state, so that grouting fullness and a hollow position are judged. Therefore, the invention overcomes the limitation that the existing method is only suitable for grouting material after coagulation and hardening, and realizes synchronous grouting, slurry supplementing and detection.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The utility model provides an anchor rope, pole grouting stage plumpness snap ring formula detection device which characterized in that includes:
the plane of the conductive mesh (1) is provided with a conduit hole (11), a grouting hole (12), an anchor bar hole (13), an inner insulation hole (15) and an outer insulation ring (16); the inner insulating ring (15) is annularly arranged on the anchor bar holes (13), the conductive meshes (1) are sleeved on the anchor cable and the rod (7) at intervals through the anchor bar holes (13), and the anchor cable and the rod (7) are positioned in the drill hole (6);
the walking guide pipe (2) is a hollow circular pipe and is formed by splicing a plurality of walking sections along the axial direction of a drilling hole in sequence, the walking sections are arranged between adjacent conductive meshes (1), the walking sections are a diameter expanding section (21), a gradual change section (22) and a diameter reducing section (23) from the middle part to the two sides in sequence, the diameter expanding section (21) and the gradual change section (22) are made of insulating materials, and the diameter reducing section (23) is made of conductive materials and is clamped in the guide pipe hole (11);
the length of the movable electrode module (3) is the same as that of the running section, the movable electrode module comprises two electrode sleeves (31), an internode sleeve (32) and a traction rope (33), the internode sleeve (32) is connected between the two electrode sleeves (31), the electrode sleeves (31) and the internode sleeve (32) can be arranged in the catheter hole (11) in a penetrating mode and are connected with the traction rope (33), the electrode sleeves (31) comprise two metal sleeves (311) and an insulating sleeve (312), the metal sleeves (311) are respectively connected with electrode leads (35), the insulating sleeve (312) is connected between the two metal sleeves (311), and electrode tentacles (34) are arranged on the electrode sleeves (31);
the handheld detector (4) comprises a binding post (41), a change-over switch (42), a signal detection module (47), a data processing module (414), an audible and visual alarm module (411), a liquid crystal display module (413), a display screen (46), an LED alarm lamp (43) and a buzzer alarm (44), wherein the binding post (41) is connected with an electrode lead (35), the change-over switch (42) is connected with the signal detection module (47), the signal detection module (47) is connected with the data processing module (414), the data processing module (414) is respectively connected with the audible and visual alarm module (411) and the liquid crystal display module (413), the audible and visual alarm module (411) is respectively connected with the LED alarm lamp (43) and the buzzer alarm (44), and the display screen (46) is connected with the liquid crystal display module (413).
2. The anchor cable, rod grouting stage plumpness snap ring type detection device according to claim 1, characterized in that the number of the binding posts is 4, the binding posts are respectively connected with 4 electrode leads (35) of the two electrode assemblies (3), the change-over switch (42) comprises 0 gear, 1 gear, 2 gear and 3 gear, the 0 gear indicates that the power is disconnected, the 1 gear indicates that two electrode leads (35) of the same electrode sleeve (31) are connected with the signal detection module (47), the 2 gear indicates that two electrode leads (35) of the two electrode sleeves (31) are connected with the signal detection module (47), and the 3 gear indicates that the other two electrode leads (35) of the two electrode sleeves (31) are connected with the signal detection module (47).
3. The anchor cable and rod grouting stage plumpness snap ring type detection device according to claim 2, wherein the conductive mesh (1) is a circular metal mesh with a plurality of round holes, the diameter is smaller than that of the drill hole (6), an outer insulating ring (16) is arranged on the periphery of the conductive mesh, and the outer insulating ring (16) is provided with supporting seats (17) at equal angular intervals along the circumferential direction of the conductive mesh.
4. The anchor cable and rod grouting stage plumpness snap ring detection device according to claim 2, wherein the electrode tentacles (34) are arranged outside the metal sleeve (311) at intervals along the circumferential direction, the diameter of the electrode sleeve (31) is smaller than the inner diameter of the diameter-reduced section (23), and the opening height of the electrode tentacles (34) is larger than the inner diameter of the diameter-reduced section (23); in a natural state, the electrode feeler (34) is loosened and opened, and the circuit is tightened and communicated and moves through the reduced diameter section (23).
5. The anchor cable and rod grouting stage plumpness snap ring type detection device according to claim 4, wherein the electrode tentacles (34) are claw-type cranks facing the same side, and a plurality of electrode tentacles are alternately arranged on the circumferential surfaces of the two metal sleeves (311) at intervals.
6. The anchor cable, stem grouting stage plumpness snap ring type detection device according to claim 2, wherein the handheld detector (4) further comprises a power circuit (48), a reset circuit (49), a crystal oscillator circuit (410) and an E2PROM memory module (412), and a USB interface (45) connected to the data processing module (414).
7. The anchor cable, rod grouting stage fullness snap ring detection device of claim 2, further comprising a grouting observation assembly (5), the grouting observation assembly comprising:
the grout stop plug (51) is used for penetrating the anchor cable and the rod (7) and is positioned at the separation part of the drilling anchoring section and the free section;
the flexible water bag (52) is arranged on one side, close to the outside of the drilling hole (6), of the slurry stop plug (51);
a liquid level pipe (53), one end of which is communicated with the flexible water bag (52), and the other end of which extends out of the drilling hole (6) along the anchor cable and the rod (7); and stopping grouting when the liquid level in the liquid level pipe (53) is obviously increased during grouting.
8. The anchor cable/stem grouting stage plumpness snap ring type detection device according to claim 7, wherein the flexible water bag (52) is filled with colored liquid.
9. The method for detecting the plumpness snap ring type detection device for the anchor cable and the rod grouting stage according to any one of claims 2 to 8, comprising the following steps:
s1, before detecting grouting fullness of a drilling hole, preparing a plastic cylinder with the same diameter and height as those of the drilling hole (6) and the same distance as those of the conductive mesh (1) in the drilling hole outside the drilling hole, fixing the conductive mesh (1) at the upper end and the lower end, saturating and filling slurry with the same property as that of the grouting material of the drilling hole, measuring the resistance value of the slurry by adopting a conventional universal meter as a standard resistance value, and reserving the standard resistance value as a subsequent comparison;
s2, hooping the conductive meshes (1) on anchor cables and rods (7) at equal intervals, and then penetrating the running guide pipes (2) into the guide pipe holes of two adjacent conductive meshes, and sequentially connecting the two guide pipe holes to form the running guide pipes with the same drilling length;
s3, placing the movable electrode module (3) at the tail end of the walking guide tube (2), winding four front and rear electrode leads (35) on the traction rope (33), distributing along the walking guide tube (2), leading out the outside of the holes, and numbering at the wire heads in sequence;
s4, penetrating a grouting pipe into the grouting holes on the conductive net (1), wherein the pipe orifice end and the movable electrode module (3) are positioned at the bottom end together;
s5, placing an anchor cable, a rod (7) together with the conductive mesh (1), the travelling catheter (2), the movable electrode module (3) and the grouting pipe into a drill hole;
s6, grouting is carried out by adopting a hole bottom slurry returning method, grouting is stopped when the liquid level of a liquid level pipe (53) is obviously increased, the 4 electrode leads (35) are respectively connected with binding posts (41) corresponding to the handheld detector (4), meanwhile, a change-over switch (44) is rotated to 1 level, and the traction rope (33) is pulled towards an orifice so as to drive the movable electrode module (3) to slowly move;
s7, after the LED alarm lamp (43) and the buzzer alarm (42) detect that the electrode feeler (34) is in contact with the conductive mesh (1), stopping pulling the movable electrode module (3), sequentially rotating the change-over switch (44) to 2 nd gear and 3 rd gear, measuring and recording the resistance value of the segmental grouting material, and displaying the resistance value on the display screen (46);
s8, comparing the measured resistance value of the segment with a standard resistance value, and when the measured value is smaller than the standard value, indicating that the segment grouting material is not full; otherwise, the compactness of the mortar reaches the requirement;
and S9, when the drilling hole is not full, secondary grouting can be performed, and after the requirement is met, the steps S6-S8 are repeated, and the operation of the next section is performed until the grouting and detection of the whole drilling hole are completed.
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