WO2023230646A1 - Scaffold load sensing device and monitoring system - Google Patents

Scaffold load sensing device and monitoring system Download PDF

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Publication number
WO2023230646A1
WO2023230646A1 PCT/AU2023/050451 AU2023050451W WO2023230646A1 WO 2023230646 A1 WO2023230646 A1 WO 2023230646A1 AU 2023050451 W AU2023050451 W AU 2023050451W WO 2023230646 A1 WO2023230646 A1 WO 2023230646A1
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WO
WIPO (PCT)
Prior art keywords
load
scaffold
deformable
sensing device
load sensing
Prior art date
Application number
PCT/AU2023/050451
Other languages
French (fr)
Inventor
Penglei DAI
Original Assignee
IQM Systems Pty Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from AU2022901504A external-priority patent/AU2022901504A0/en
Application filed by IQM Systems Pty Ltd filed Critical IQM Systems Pty Ltd
Publication of WO2023230646A1 publication Critical patent/WO2023230646A1/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0025—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of elongated objects, e.g. pipes, masts, towers or railways
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00—Component parts or accessories for scaffolds
    • E04G5/02—Scaffold feet, e.g. with arrangements for adjustment
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00—Measuring force or stress, in general
    • G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
    • G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
    • G01L1/225—Measuring circuits therefor
    • G01L1/2262—Measuring circuits therefor involving simple electrical bridges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00—Component parts or accessories for scaffolds
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/02—Alarms for ensuring the safety of persons

Definitions

  • a bricklayer is more likely to impose a heavier load than a painter, as the weight of the bricks is much greater than some cans of paint.
  • the duty live load accounts for the materials and equipment to be used and stored on the scaffold, as well as the maximum number of people working on it at any given time.
  • the electrically conductive circuit 37 of the strain gauge 36 is tightly attached to the film (such as a substantially elastic polyimide film) 38 in a zigzag shape.
  • the film 38 is stretched, the electrically conductive material of the circuit 37 stretches and becomes elongated.
  • the electrically conductive material of the circuit 37 contracts and becomes shorter. This deformation or change in shape causes the resistance change of the electrically conductive circuit 37 on the strain gauge 36.
  • the scaffold load monitoring system is configured to determine if a specific or threshold load value has been reached and, if so, will inform the relevant user accordingly in real time.
  • the load sensing devices 10 of the present invention (including the load signal transmitter devices 48) which are deployed on the scaffold 40 can continuously monitor the load on the scaffold.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Force Measurement Appropriate To Specific Purposes (AREA)

Abstract

A scaffold load sensing device (10) for detecting overloading of a scaffold assembly (40) has a body (22) with an inner through-hole (24) extending from a top to a bottom of the body. The through-hole receives therethrough a rod (12) of a base jack (14) which supports a standard (16) of the scaffold assembly. A top portion (26) of the body has an upwardly facing first surface (28) against which a lower end of the standard presses downwardly, and a bottom portion (30) of the body has a downwardly facing second surface (32) against which a handle (20) of the base jack presses upwardly. The first and second surfaces are interconnected by a region (44) which includes one or more deformable areas (34). The or each deformable area has a strain gauge (36) affixed thereto which is operable to transduce a deformation of the deformable area into an electrical signal which can be monitored.

Description

SCAFFOLD LOAD SENSING DEVICE AND MONITORING SYSTEM
TECHNICAL FIELD
The present invention relates to scaffold load sensing devices and to a scaffold load monitoring system. In particular, the present invention relates to scaffold load sensing devices for use in a scaffold load monitoring system operating in multi-storey residential and commercial construction projects.
BACKGROUND OF THE INVENTION
In multi-storey construction projects, a scaffold is typically located around the perimeter of a new building or maintenance site. Scaffold structures may also be erected inside a building under construction on a more temporary basis as and when required. The scaffold enables workers to work on or around the structures and surfaces in a controlled environment, with reduced risk of injury from falling, whilst being protected from falling objects. In addition, the scaffold provides an easy way to access the building externally for workers and materials before the internal access points have been completed. In addition, the scaffold can be used to prevent unauthorised access to the site, and provides other advantages, such as dust control.
As the height of the scaffold increases, there is an increasing risk of the scaffold collapsing. This is due to the limited structural strength of the scaffold, and the increased load placed on the scaffold due to its own weight as the height increases.
In the field of scaffolding, load is normally considered in terms of dead load and the duty live load. The dead load generally refers to the weight of the scaffold itself. This includes the weight of the standards (through which load is transmitted to an underlying supporting structure for the scaffold) and all connected structures, such as the frames, cross braces, planks, guard rails and other attachments. The dead load increases with the height of the scaffold. Other forces, such as environmental factors, contribute to the dead load (water and ice, for example). The duty live load considers the function of the scaffold and the loads it carries. Scaffold function is best described as the use to be made of the scaffold structure (light, medium or heavy duty use). The nature of the work to be performed on the scaffold is a good indicator of the duty live load. For example, a bricklayer is more likely to impose a heavier load than a painter, as the weight of the bricks is much greater than some cans of paint. The duty live load accounts for the materials and equipment to be used and stored on the scaffold, as well as the maximum number of people working on it at any given time.
A scaffold should be designed to safely carry the required number of working platforms and also to support the duty live load.
Due to the large number of independent tradespeople who may be working on a construction site at any given time, there is scope for dangerous situations to arise where workers can potentially overload the scaffold with tools and materials. In such a situation, there is currently no practical and reliable way for the site manager to, in real time, monitor the load (notably the duty live load) on the scaffold and to immediately know if the scaffold has been overloaded.
SUMMARY OF INVENTION
It is an object of the present invention to overcome or at least substantially ameliorate one or more of the above disadvantages, or to provide a useful alternative.
According to the present invention, there is provided a scaffold load sensing device for detecting overloading of a scaffold assembly, the device comprising a body having an inner through-hole extending from a top to a bottom of the body for receiving therethrough a rod of a base jack which supports a standard of the scaffold assembly, a top portion of the body having an upwardly facing first surface against which a lower end of the standard presses downwardly, and a bottom portion of the body having a downwardly facing second surface against which a handle of the base jack presses upwardly, the first and second surfaces being interconnected by a region which includes one or more deformable areas, the or each deformable area having a strain gauge affixed thereto and which is operable to transduce a deformation of the deformable area into an electrical signal which can be monitored.
According to another aspect of the present invention, there is provided a method of using a scaffold load sensing device to detect overloading of a scaffold assembly, the device comprising a body having an inner through-hole extending from a top to a bottom of the body, a top portion of the body having an upwardly facing first surface and a bottom portion of the body having a downwardly facing second surface, the first and second surfaces being interconnected by a region which includes one or more deformable areas, the or each deformable area having a strain gauge affixed thereto and which is operable to continuously monitor the load so that, upon a load deforming the deformable area sufficiently to cause the sensed load to attain a predetermined threshold load value, the deformation of the deformable area is transduced into an electrical signal which can activate an alarm, the method including the steps of: locating the load sensing device around a rod of a base jack which supports a standard of the scaffold assembly, whereby the rod is received through the inner through-hole of the body, locating a lower end of the standard so as to press downwardly against the upwardly facing first surface of the load sensing device, locating a handle of the base jack so as to press upwardly against the downwardly facing second surface of the load sensing device, and activating the alarm if the load sensed by the load sensing device attains the predetermined threshold load value.
The method preferably includes the step of sending one or more electronic messages by SMS notification and/or email to one or more recipients recorded in a database in response to the load sensed by the load sensing device attaining the predetermined threshold load value.
There has been thus outlined, rather broadly, the more important features of one aspect of the invention in order that the detailed description thereof that follows may be better understood and put into practical effect, and in order that the present contribution to the art may be better appreciated.
There are additional features of the invention that will be described hereinafter. As such, those skilled in the art will appreciate that the concept, upon which the disclosure is based, may be readily utilized as the basis for designing other structures, assemblies, method steps and system configurations for carrying out the objects of the present invention. It is important, therefore, that the broad outline of the invention described above be regarded as including such equivalent features insofar as they do not depart from the spirit and scope of the present invention.
BRIEF DESCRIPTION OF DRAWINGS
Fig. l is a perspective view of a section of a scaffold showing a scaffold load sensing device according to a first embodiment of the present invention operably located between a handle of a base jack and a standard of a scaffold. Fig. 2 is a side elevation view of the arrangement shown in Fig. 1, and which also shows internal detail.
Fig. 3 is a sectional side elevation view of an arrangement of the load sensing device shown in Fig. 1, a base jack with its handle, and a standard, which is similar to the arrangement shown in Fig. 1.
Fig. 4 is a perspective view of the arrangement shown in Fig. 1 showing a load signal transmitter device connected by an electrical cable to the load sensing device.
Fig. 5 is a perspective view of a strain gauge which may be used in the load sensing device of the present invention, together with diagrammatic representations showing how electrical resistance changes under tensile strain or under compressive strain.
Fig. 6 is a diagrammatic representation of a Wheatstone bridge circuit which may be used in the load sensing device of the present invention.
Fig. 7 is a schematic representation of the communication from a plurality of load signal transmitter devices, which receive load values from respective load sensing devices of Figs. 1 to 4, to a user of the scaffold load monitoring system, the communication being via a Gateway (such as a LoRa-based Gateway) which is networked to System Monitoring Software accessible to the user.
Fig. 8 is a schematic representation of the communication between a plurality of the load signal transmitter devices shown deployed on a scaffold, via the Gateway, and a central monitoring and control computer which displays load value data and other data through a Dashboard-Graphic User Interface to the user.
BEST MODE OF CARRYING OUT THE INVENTION
The scaffold load sensing device (or load cell) 10 shown in Figs. 1 to 4 is one embodiment of the present invention which is specifically designed to detect overloading of a scaffold assembly (as shown in Fig. 8) by fitting around a threaded rod 12 of a base jack 14 used to support a standard 16 of the scaffold 40 on an underlying supporting structure 18. The load sensing device 10 sits on the top of a rotatable handle 20 of the base jack 14, and the standard 16 sits on the top of the load sensing device 10. More specifically, and as best shown in Fig. 3, the scaffold load sensing device 10 comprises a body 22 having an inner through-hole 24 extending from a top to a bottom of the body 22 for receiving therethrough the rod 12 of the base jack 14 which supports the standard 16 of the scaffold assembly. A top portion 26 of the body 22 has an upwardly facing first surface 28 and a bottom portion 30 of the body 22 has a downwardly facing second surface 32. The first and second surfaces 28, 32 are interconnected by a region 44 which includes one or more deformable areas 34. The or each deformable area 34 has a strain gauge 36 affixed thereto. The strain gauge 36 is operable to transduce a deformation of the deformable area 34 into an electrical signal which can be monitored.
In use, the load sensing device 10 will be able to determine the weight of the scaffold 40 above any one particular standard 16, and therefore determine the load on the scaffold transmitted through that standard.
In this particular embodiment of the invention, the load sensing device 10, being a load cell, uses a transducer to convert a load or force acting on it into an electrical signal. A load cell, such as load cell 10, has areas, structures, or groups of areas, which are designed to be stressed or deformed when a force is applied. The deformable areas of a load cell sense the force applied under pressure and provide an electrical output signal proportional to the force.
The electrical output signal can be a voltage change, current change, or frequency change, depending on the type of load cell and circuitry used.
There are many different types of load cells, depending on the types of transducers used to sense load or force. The transducers commonly used in the design of load cells include strain gauges (such as strain gauge 36), capacitive transducers, piezoelectric transducers, and magnetic transducers.
The type of load cell used for the load sensing device 10 of the present invention is a resistive load cell, and, in particular, is a through-hole load cell, which uses a strain gauge 36 to sense the load or force.
Resistive load cells work on the principle of piezoresistivity. When a load or force is applied to the strain gauge 36 affixed to the load cell, it changes its resistance. This change in resistance leads to a change in output voltage when an input voltage is being applied.
To achieve the change in resistance under load, strain gauges are normally used in the resistive load cells. The strain gauge 36 is essentially a deformable circuit 37 made of metal foil material secured to a deformable film 38. The electrical resistance of the strain gauge 36 varies with applied force. It can convert (or transduce) pressure, tension, compression, torque, or weight forces on the load cell 10, which causes the strain gauge 36 to deform and change its electrical resistance, into an electrical output signal proportional to the force which can then be measured.
As shown in Fig. 5, the electrically conductive circuit 37 of the strain gauge 36 is tightly attached to the film (such as a substantially elastic polyimide film) 38 in a zigzag shape. When this film 38 is stretched, the electrically conductive material of the circuit 37 stretches and becomes elongated. When this film 38 is compressed or undergoes contraction, the electrically conductive material of the circuit 37 contracts and becomes shorter. This deformation or change in shape causes the resistance change of the electrically conductive circuit 37 on the strain gauge 36.
In the resistive load cell 10, several strain gauges 36 are pasted (or otherwise affixed) to certain surface areas of the load cell. The load cell 10 is made of a metal material, such as aluminium or stainless steel, which has substantially elastic properties typical of such metal material. When a load is applied on the load cell 10 and the attached strain gauges 36 are deformed due to the elastic deformation of the load cell structure, the resulting change in the resistance of the electrically conductive circuits 37 on the strain gauges 36 can be detected.
To convert the resistance change of the strain gauges 36 (caused by the load) into a measurable voltage (proportional to the load), a Wheatstone bridge circuit 42 is formed.
As shown in Fig. 6, four strain gauges 36 of a Wheatstone bridge circuit 42 are arranged as a quadrilateral ABCD. The load cell 10 will then, via its battery, provide an excitation voltage Vin which is applied between points B and D, whereas the voltage difference Vout is measured between points A and C. When no load is applied, the four strain gauges 36 have the same resistance values, and the voltage output Voutis zero. When a load is applied, the resulting elastic deformation of the load cell 10 leads to the change in the resistances of the strain gauges 36, which will cause a change in output voltage Vout. This change in Vout is usually very small, about 20 millivolt (mV) of total change in response to maximum load capacity of the load cell 10. This very small change in the output voltage is then amplified for detection purposes using an electronic amplifier, so that the Vout can be proportionally enlarged to a higher amplitude 0-5 V or 0-10V voltage output signal. Such amplified signals can then be measured and calibrated to the measured load.
Although the aforementioned embodiment of the invention utilizes a through-hole load cell 10, there are many other mechanically different types of resistive load cells which may be suitable for use with scaffolding structures. These include single point load cells, shear beam load cells, miniature load cells, column load cells, button load cells, S-beam load cells, pancake load cells, rod end load cells and bending beam load cells.
The through-hole load cell 10, as mentioned earlier, is specifically designed to facilitate the measurement of load applied on a standard 16 of a scaffold 40, and is installed between the rotatable handle 20 of the base jack 14 and the standard 16. As shown sectionally in Fig. 3, the strain gauges 36 are pasted to areas 34 on the convex surface of a metallic inner thin sleeve region 44 which can be deformed under a vertically applied load.
The strain gauge 36 of the load sensing device (or load cell) 10 is connected via a direct cable 46 (as shown in Fig. 4) to a load signal transmitter device 48 located adjacent to the load sensing device 10 on the standard 16. The load signal transmitter device 48 will receive a load value from the load sensing device 10 and transmit the value to a remote server or a central monitoring and control computer 114 which is a part of a scaffold load monitoring system (see Figs. 7 and 8).
The scaffold load monitoring system is configured to determine if a specific or threshold load value has been reached and, if so, will inform the relevant user accordingly in real time.
The load signal transmitter device 48 linked to the load sensing device 10 will ideally be operating at all relevant times, and so will continuously require power from a battery or other power source to receive, in unbroken form, the load value data.
Figs. 7 and 8 show schematically how a plurality of the load signal transmitter devices 48 can communicate wirelessly and remotely via a Gateway 110 which is networked to System Monitoring Software 112 operating a central monitoring and control computer 114 and/or a network of distributed computers. Such a Gateway 110 may be a LoRa-based Gateway which can receive and transmit signals over a distance of up to 15 kilometres in suburban areas (LoRaWAN).
Communication between a LoRa-based Gateway and the central monitoring and control computer 114 and/or network of distributed computers is via existing Ethemet/Wi-Fi infrastructures or via mobile Internet (eg. 4G, 5G or IOT).
In this way, the load sensing devices 10 of the present invention (including the load signal transmitter devices 48) which are deployed on the scaffold 40 can continuously monitor the load on the scaffold.
The load sensing devices 10 of the present invention provide feedback wirelessly via the Gateway 110.
Information received by the designated safety supervisor may be represented on a Dashboard- Graphic User Interface (GUI) 116 of the remotely located, central monitoring and control computer 114 and/or of a network of distributed computers. Such computers may include conventional desktop or laptop computers, smart phones and similar devices suitable for offsite monitoring and management of the safe use of the scaffold.
When a load sensing device 10 of the present invention detects that a predetermined weight limit has been reached, an alert message or other alarm signal signifying a safety breach is triggered and immediately transmitted via the Gateway 110 to the Dashboard-GUI 116 indicating an excessive load has been applied on the scaffold 40. An email or SMS (text message) notification is also immediately sent to the designated safety supervisor and/or to a hierarchical chain of command.
Even after the initial alarm signal has been received, the other load sensing devices 10 on the scaffold 40 continue in their sensing modes and may communicate with one another to ensure the operational integrity of all the other standards 16 and connected structures of the scaffold.
The load sensing device 10 in the alarm mode continues to send alarm signals, either continuously or periodically, until the excessive load is removed and the load sensing device is redeployed to a sensing mode.
The capturing and recording of data relating to the sensing of excessive loads is useful for the purpose of documenting unsafe practices, and quickly identifying the location of the safety breach and the person responsible for the safety breach. Because the alarm is triggered in real time, it is normally possible to identify the person responsible immediately, and this acts as a strong deterrent to overloading a scaffold.
The System Monitoring Software 112 may be used to collect and display in real time the aforementioned data, statistics and other information for continuous safety management. Among the information which may be displayed on the Dashboard-GUI 116 is a graphical representation (in two or three dimensions) of the scaffold 40 showing the location and mode (or operational condition) of all the load sensing devices 10 deployed on the scaffold.
It will also be readily appreciated by persons skilled in this art, upon reading this description of embodiments of the invention, that there may be alternative embodiments of load sensing devices (including load signal transmitter devices) for a scaffold which fall within the scope of the present invention.
The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgement or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates before the filing date of this patent application.

Claims

1. A scaffold load sensing device for detecting overloading of a scaffold assembly, the device comprising a body having an inner through-hole extending from a top to a bottom of the body for receiving therethrough a rod of a base jack which supports a standard of the scaffold assembly, a top portion of the body having an upwardly facing first surface against which a lower end of the standard presses downwardly, and a bottom portion of the body having a downwardly facing second surface against which a handle of the base jack presses upwardly, the first and second surfaces being interconnected by a region which includes one or more deformable areas, the or each deformable area having a strain gauge affixed thereto and which is operable to transduce a deformation of the deformable area into an electrical signal which can be monitored.
2. The device of claim 1, wherein the strain gauge comprises a transducer.
3. The device of claim 2, wherein the transducer comprises a capacitive transducer, a piezoelectric transducer, or a magnetic transducer.
4. The device of claim 1, wherein the electrical signal is a voltage change, a current change, or a frequency change.
5. The device of claim 1, wherein the strain gauge comprises a deformable circuit made of metal foil secured to a deformable film, whereby a deformation of the deformable circuit under an overloading of the scaffold assembly causes a change in the resistance of the deformable circuit, which causes a voltage change in the electrical signal.
6. The device of claim 5, wherein the change in the resistance of the deformable circuit is converted to a voltage change by a Wheatstone bridge circuit.
7. The device of claim 1, wherein the or each deformable area is a convex surface of a metallic inner thin sleeve region of the strain gauge.
8. The device of claim 1, wherein the strain gauge is connected by a cable to a load signal transmitter device located on the standard.
9. A method of using a scaffold load sensing device to detect overloading of a scaffold assembly, the device comprising a body having an inner through-hole extending from a top to a bottom of the body, a top portion of the body having an upwardly facing first surface and a bottom portion of the body having a downwardly facing second surface, the first and second surfaces being interconnected by a region which includes one or more deformable areas, the or each deformable area having a strain gauge affixed thereto and which is operable to continuously monitor the load so that, upon a load deforming the deformable area sufficiently to cause the sensed load to attain a predetermined threshold load value, the deformation of the deformable area is transduced into an electrical signal which can activate an alarm, the method including the steps of: locating the load sensing device around a rod of a base jack which supports a standard of the scaffold assembly, whereby the rod is received through the inner through-hole of the body, locating a lower end of the standard so as to press downwardly against the upwardly facing first surface of the load sensing device, locating a handle of the base jack so as to press upwardly against the downwardly facing second surface of the load sensing device, and activating the alarm if the load sensed by the load sensing device attains the predetermined threshold load value.
10. The method of claim 9, further including the step of sending one or more electronic messages by SMS notification and/or email to one or more recipients recorded in a database in response to the load sensed by the load sensing device attaining the predetermined threshold load value.
PCT/AU2023/050451 2022-06-01 2023-05-29 Scaffold load sensing device and monitoring system WO2023230646A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2022901504 2022-06-01
AU2022901504A AU2022901504A0 (en) 2022-06-01 Scaffold Load Sensing Device And Monitoring System

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203893969U (en) * 2014-06-12 2014-10-22 北京盛明建达工程技术有限公司 Scaffold vertical rod load monitoring device
CN105067166A (en) * 2015-07-28 2015-11-18 北京工业大学 Sleeve type force transducer for support structures
WO2021003556A1 (en) * 2019-07-05 2021-01-14 Ronald Chun Yu Lam Force and inclination monitoring system with self-position recognition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203893969U (en) * 2014-06-12 2014-10-22 北京盛明建达工程技术有限公司 Scaffold vertical rod load monitoring device
CN105067166A (en) * 2015-07-28 2015-11-18 北京工业大学 Sleeve type force transducer for support structures
WO2021003556A1 (en) * 2019-07-05 2021-01-14 Ronald Chun Yu Lam Force and inclination monitoring system with self-position recognition

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
HUNHEE CHO, SAYAN SAKHAKARMI, KYUNGKI KIM, JEE WOONG PARK: "Scaffolding Modelling for Real-Time Monitoring using a Strain Sensing Approach", 35TH INTERNATIONAL SYMPOSIUM ON AUTOMATION AND ROBOTICS IN CONSTRUCTION (ISARC 2018), 22 July 2018 (2018-07-22) - 1 July 2017 (2017-07-01), XP055768603, ISSN: 2413-5844, DOI: 10.22260/ISARC2018/0007 *

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