KR101765890B1 - Apparatus for measuring point displacement of bridge - Google Patents

Abstract

The present invention relates to a bridge point displacement measuring apparatus capable of precise measurement. As a length of a sensor rod on which a sensor is installed is shortened as much as possible to minimize warpage of the sensor rod, the sensor rod is prevented from being shaken by wind; thereby allowing a smooth sensing operation of the sensor. The center of gravity of the apparatus is positioned lower than an upper support of a tripod such that the apparatus is able to be maintained in a stable state which results in improved measurement quality. In addition, a nut member is able to be prevented from arbitrarily rotating without providing a separate rotation prevention means; thereby providing simple usage. As an electric wire of a sensor installed in an upper end of the sensor rod is pulled into the upper end of the sensor and pulled out from a lower end of the sensor rod, the electric wire is not shaken by wind to prevent measurement from being impossible to be carried out due to a poor contact or a disconnection. The accuracy of measuring the bridge point displacement is able to be improved by the sensor coupled to the upper end of the sensor rod by including a horizontal checking means to allow the sensor rod to accurately be vertically installed. Moreover, a safety support means is further included to more stably mount the tripod; thereby enabling a precise measurement.

Description

[0001] The present invention relates to an apparatus for measuring a displacement of a bridge,

The present invention relates to a point displacement measuring device for a bridge capable of precise measurement, and more particularly, to minimize the warpage of the sensor rods by minimizing the length of the sensor rods on which the sensors are installed, thereby preventing the sensor rods from being shaken by the wind, So that the center of gravity of the device is positioned lower than the upper support of the tripod so that the device is kept in a stable state and consequently the quality of the measurement is improved and the nut member It is possible to prevent rotation arbitrarily and to make it easy to use. The wire of the sensor installed at the upper end of the sensor rod is drawn in from the upper end of the sensor rod and drawn out from the lower end, Prevent this from becoming impossible And more particularly, to a point displacement measuring apparatus for a bridge capable of precisely measuring the height of a sensor bar so that the sensor bar can be vertically installed and a tripod can be rigidly mounted on the tripod .

In general, if the bridge structure is inspected after 5 years of construction, the safety assessment of the structure is carried out and the safety evaluation of the structure is carried out.

For this purpose, it is necessary to evaluate the safety of the bridge structure. Also, it is necessary to evaluate the safety of bridges periodically or from time to time in order to prevent large accidents before a certain period of time after completion.

Conventionally, in order to check the safety of the bridge structure, a separate measuring instrument is installed at the midway point of the bridge top plate, the test vehicle is operated to measure various displacements acting on the bridge, and the data is analyzed to check the condition of the bridge.

In other words, the measuring device that measures the point displacement of the bridge closely adheres to the bottom of the bridge and measures the displacement of the bridge while the vehicle is passing.

As a conventional prior art, Korean Patent Registration No. 10-0900868 (registered on May 27, 2009), "integrated management system for moment change of bridges" (hereinafter referred to as "prior art 1"), By installing a sensor on the vertical surface of the measuring device, the mechanical signal detected by the sensor can be converted into an electrical signal, so that the on-site monitoring terminal, which can be immediately confirmed in the field, can be used. The measured data of the result can be transmitted and the signals can be analyzed. Therefore, it is possible to replace the sensor without disassembling and assembling the upper plate, which is easy to install and easy to use.

However, since the above-mentioned prior art 1 is not easy to assemble and disassemble, it takes a long time to install the measuring device under the bridge, and the time required for disassembling the measuring device after the completion of the measuring operation becomes long, There is a problem that the operation is troublesome and time consuming.

As a prior art for solving these problems, Korean Patent No. 10-1483779 (Registered on January 12, 2015) "Bridge Displacement Measurement Apparatus for Bridges" (hereinafter referred to as "Prior Art 2") can be erected on the ground A support block in which a plurality of legs are rotatably installed and an elevation shaft is vertically inserted; A sensing unit extending upward from the elevation shaft and contacting a bottom surface of the bridge to measure a point displacement of the bridge; A support plate supported on the support block and having a first panel and a second panel coupled to each other by a coupling portion, a main gear rotatably installed on a fixed block provided on the first panel, A lift member that is detachably attached to the main shaft of the main gear; and a lift member that is detachably attached to the main shaft of the main gear, the lift member being detachably attached to the support plate; A retaining gear provided on a polygonal shaft provided so as to be able to protrude and retract through the case and the cover member and to be gear-connected to the driven gear, and a locking projection formed on the shaft, And a second operating hole portion formed at an outer end of the shaft so as to prevent the elevating shaft from descending in a state in which the elevating shaft is raised, Since the elevating shaft can be elevated by the operation and the elevation state can be maintained, it is possible to easily carry out the inspection work of the bridge, and the engaging portion for assembling and disassembling the supporting plate for supporting the elevating operation portion by a simple operation is provided. And disassembly can be easily performed, so that the time and the time required for the inspection work of the bridge And a mounting and demounting unit for easily assembling and disassembling the cover member of the lifting and lowering operating unit is provided, so that the time required for installing and dismounting the measuring apparatus can be more effectively reduced.

Typically, bridges are equipped with a plurality of bridge columns between alternating ends at both ends, and an upper structure consisting of girders, resilient supports and top plates is installed between the bridge and the piers, between the piers and the piers. The height from the ground to the bridge bottom is low and the difference in height between them is several meters to tens of meters. In the case of Prior Art 2, one elevation shaft (Nasa-bar) And an extension axis (pipe). The height from the ground to the bottom of the bridge usually ranges from a few meters to several tens of meters. When the height is high, either the elevation shaft or the extension shaft must be formed to be very long do.

Since the elevating shaft is screwed to the nut member as a threaded rod, the elevating shaft is coupled to the tripod, and the extending shaft is detachably coupled to the elevating shaft. Therefore, when the length of the elevating shaft is long, when the bottom of the elevating shaft is lower than the bottom of the tripod The tripod can not be mounted, and when the lower end of the elevating shaft is higher than the lower end of the tripod, the upper end of the elevating shaft can be elevated and the operator can not connect the lower end of the elevating shaft to the upper end of the elevating shaft. There is a limit in constructing a long length, and in the case of the prior art, since the length of the tripod is set to be as long as the height of the tripod, it is inevitable that the extension shaft has a length ranging from several meters to several tens of meters.

Since the elevating shaft is made of a metal screw rod and the extending shaft is made of a plastic pipe, when the length of the extending shaft is made long, the extending shaft is easily shaken by the wind, It is difficult to precisely contact the measurement object, which results in deterioration of the measurement quality.

In addition, if the height from the ground where the tripod is mounted to the bottom of the bridge is long, the extension axis must be long. In this case, since the center of gravity of the entire apparatus is positioned above the tripod, the apparatus becomes unstable, .

In addition, since the driven gear and the driven gear are formed of bevel gears, if the extension shaft vibrates, the driven gear and the driven gear can rotate in any direction. Therefore, Which is complicated and troublesome to use.

In addition, since the electric wire connected to the sensing part provided at the upper end of the extension shaft is drawn out to the outside of the extension shaft, the electric wire is wound around the weak wind, which may result in failure of measurement due to poor contact or disconnection.

In addition, since the process of confirming the vertical state of the sensor rod by aligning the tripod is horizontal, it is difficult to install the sensor rod accurately and vertically because the experience or the sensation is performed.

Further, when the sensor is coupled to the upper end of the extension shaft, since the adhesive tape is wound around the outer peripheral surface of the extension shaft in a state where the sensor is overlapped with the sensor, the installation of the sensor is not ensured.

Therefore, the sensing operation of the sensing part is smoothly performed by minimizing the warp of the extension shaft provided with the sensing part, and the center of gravity of the device is positioned lower than the upper support part of the tripod so that the device is maintained in a stable state, It is possible to simplify the structure and simplify the use of the sensor, and to securely maintain the electric wire connected to the sensing unit, thereby preventing the contact failure or the disconnection, and at the same time, So as to improve the measurement accuracy.

Korea Registered Patent No. 10-0900868 (Registered on May 27, 2009) "Integration management system of moment change of bridges" Korean Registered Patent No. 10-1483779 (Registered on January 12, 2015) "Point displacement measuring device for bridges"

Accordingly, it is an object of the present invention to minimize the warpage of the sensor rods by minimizing the length of the sensor rods in which the sensors are installed, thereby preventing the sensor rods from being shaken by the wind so that the sensing operation of the sensors can be smoothly performed. Device.

It is another object of the present invention to provide a point displacement measuring apparatus for a bridge capable of precisely measuring the position of the apparatus so that the center of gravity of the apparatus is positioned lower than the upper support of the tripod so that the apparatus is maintained in a stable state,

It is still another object of the present invention to provide a point displacement measuring apparatus for a bridge capable of precisely measuring the rotation of the nut member without any additional rotation preventing means and making it easy to use.

Another object of the present invention is to prevent the wires from being shaken in the wind by pulling the wires of the sensor provided at the upper end of the sensor rod from the upper end of the sensor rod to the inside and pulling out from the lower end thereof, Which is capable of precisely measuring the displacement of the bridge.

It is another object of the present invention to provide a point displacement measuring device for a bridge capable of precisely measuring the height of the sensor rod so that the sensor rod can be vertically installed and the tripod can be rigidly mounted .

According to an aspect of the present invention, there is provided a tripod, including: an upper support which is vertically and vertically penetrated through a center; a tripod having three legs rotatably mounted on the upper support; An elevation guide pipe vertically installed in the installation hole of the upper support and formed with a lift guide hole; A bearing tube having a lower end coupled to an upper end of the lifting guide pipe and having a bearing hole; An elevating screw bar having a plurality of unit screw rods vertically installed to penetrate through the elevating guide holes and the bearing holes and having a male screw portion formed on an outer circumferential surface thereof and being connectable to each other; A nut member rotatably installed in the bearing hole and having a female screw portion engaged with the male screw portion; A mount coupled to an upper end of the bearing tube; Rotating means for rotating the nut member; A sensor rod coupled to an upper end of the elevating screw rod; And a sensor coupled to an upper end of the sensor rod and contacting a bottom surface of the bridge to measure a point displacement of the bridge, further comprising a counterweight coupled to a lower end of the elevating screw rod to lower the center of gravity, A connection screw projection is formed at an upper end of the screw rod and at an upper end of the counterweight and a connection screw groove is formed at a lower end of the uprising screw rod to fasten the connection screw projection and the connection screw projection is fastened to a lower end of the sensor rod And a connecting screw hole is formed in the nut member. The rotating means includes a worm wheel coupled to an upper surface of the nut member, a horizontal shaft horizontally installed on one side of the nut member, A worm, a handle engaging portion formed at a distal end portion of the horizontal shaft, and a state of being integrally rotated with the handle engaging portion, And a horizontal checking means for checking the horizontal state of the upper support and the mount and nut members of the tripod and the vertical state of the elevating guide pipe and the bearing pipe so that the sensor rod can be vertically installed accurately, Further comprising a safety supporting means for connecting the three legs together and allowing the legs to be held in a stable posture without slipping or sagging even when the legs are excessively widened. Which is capable of precisely measuring the displacement of the bridge.

Wherein the safety support means comprises a ring attached to the lower end of the lower leg of the three legs, a chain connected to the ring at one end, and a turnbuckle connected between the chains, And a female threaded portion engaged with the right threaded rod at one end, and a female threaded portion engaged with the left threaded rod at the other end thereof. The left and right threaded rods are connected to the right and left threaded rods, Wherein the chain link is formed with a chain insertion groove into which a ring constituting a chain is inserted and having a split piece having a pin insertion hole formed thereon, And a pin release preventing ring for preventing the chain release preventive pin from disengaging.

According to the point displacement measuring apparatus for a bridge capable of precisely measuring the bridge according to the present invention, a plurality of elevating and lowering rods are connected according to the height from the ground where the tripod is mounted to the lower surface of the bridge, The length of the sensor rod on which the sensor is installed can be made as short as possible, so that warping of the sensor rod can be minimized and the sensing operation of the sensor can be smoothly performed.

According to the point displacement measuring apparatus for a bridge capable of precise measurement of the present invention, since the weight is connected to the lower end of the lowermost elevating screw, the center of gravity of the apparatus is positioned lower than the upper support of the tripod, As a result, the measurement quality is improved.

According to the present invention, the worm wheel and the worm are provided in the rotating means for rotating the nut member engaged with the lifting / lowering rod, so that the worm wheel does not rotate unless the worm is rotated, So that the structure is simplified and the use is simplified.

The point displacement measuring apparatus for bridges capable of precisely measuring the bridge according to the present invention can further include a horizontal checking means to accurately set the sensor rods vertically so that the precision of the bridge point displacement measurement by the sensor coupled to the upper end of the sensor rods can be improved do.

The point displacement measuring apparatus for bridges capable of precisely measuring the bridge according to the present invention further includes a safety supporting means, so that the tripod can be more stably mounted, thereby enabling precise measurement.

1 to 6 show a preferred embodiment of a point displacement measuring apparatus for a bridge capable of precise measurement according to the present invention,
1 is a perspective view of a point displacement measuring apparatus for a bridge capable of precise measurement according to the present embodiment,
2 is an exploded perspective view of a point displacement measuring apparatus for a bridge capable of precise measurement according to the present embodiment,
3 is an exploded perspective view of the horizontal checking means,
4 is an exploded perspective view of the safety support means,
5 is a perspective view showing a measurement state,
6 is a view showing a measurement state for a bridge,
7 to 9 show modified examples of the sensor rod,
7 is a perspective view of the sensor rod,
8 is an exploded perspective view of the sensor rod,
9 is a partially enlarged longitudinal sectional view of the sensor rod,
10 and 11 show a modification of the sensor,
10 is a perspective view showing a combined state of the sensor bar and the sensor,
11 is an exploded perspective view of the sensor bar and the sensor.

Hereinafter, a point displacement measuring apparatus for a bridge capable of precise measurement according to the present invention will be described in detail with reference to the preferred embodiments illustrated in the accompanying drawings.

In the following description, the illustration and description of the bolt through-hole and the bolt fastening hole (screw hole) through which the bolt is simply inserted or fastened are omitted in order to join the components.

1 to 6 show a preferred embodiment of a point displacement measuring apparatus for a bridge capable of precise measurement according to the present invention.

As shown in FIGS. 1 to 6, the point displacement measuring apparatus for a bridge capable of precisely measuring according to the present embodiment includes an upper support table 110 formed at an upper portion and a lower portion at the center, A tripod 100 having three legs 120 rotatably mounted on the upper support 110; An elevation guide pipe 200 inserted into the installation hole 111 of the upper support platform 110 and installed vertically and having an elevation guide hole 210; A bearing tube 300 coupled to an upper end of the lifting guide pipe 200 and having a bearing hole 310; A plurality of unit thread rods 401, 402, and 403 vertically installed to penetrate through the elevation guide hole 210 and the bearing hole 310 and having a male screw portion 410 formed on the outer circumferential surface thereof and being connectable with each other A lifting / lowering rod 400; A nut member (500) rotatably installed in the bearing hole (310) and having a female threaded portion (510) engaged with the male threaded portion (410); A mount 600 coupled to the upper end of the bearing tube 300; Rotating means (700) for rotating the nut member (500); A sensor rod 800 coupled to an upper end of the lifting / lowering rod 400; A sensor 900 coupled to an upper end of the sensor rod 800 to contact a bottom surface of the bridge to measure a point displacement of the bridge; And the horizontal state of the top support 110 of the tripod 100 and the mount 600 and the nut member 500 and the vertical state of the lifting guide pipe 200 and the bearing pipe 300, 800 to be installed vertically and precisely.

An installation hole 111 having an inner diameter larger than the outer diameter of the lifting guide pipe 200 and smaller than the outer diameter of the bearing pipe 300 is formed at the center of the upper support rod 110 of the tripod 100.

Each of the three legs 120 includes an upper leg 121 having an upper end rotatably installed on the upper support 110 and a lower leg 122 slidably installed on the upper leg 121 And is adjustable in length.

In the illustrated example, the upper legs 110 are composed of two members spaced apart from each other, and the lower legs 120 are slidably inserted between two members spaced apart from each other. Or any type of the upper leg 110 and the lower leg 120 can be adopted as long as the length of the trip leg 110 and the lower leg 120 can be adjusted.

Reference numeral 123 denotes a fastening portion coupled to the lower end of the lower leg 122. Reference numeral 124 denotes a leg fastener coupled to the lower end of the upper leg 121. Reference numeral 125 denotes a fastener fastened to the leg fastener 124, To the lower leg 121, as shown in Fig.

The tripod 100 may be a conventional camera tripod or a tripod for measurement, so that detailed description thereof will be omitted.

The lifting guide pipe 200 and the bearing pipe 300 may be integrally formed or integrally joined by welding.

The bearing pipe 300 is fixed to the upper support base 110 by fastening a bolt (not shown) penetrating the upper support base 110 from below to a screw hole (not shown) formed by a tapping screw on the lower surface of the bearing pipe 300 As shown in Fig.

At this time, since the bearing pipe 300 is integrated with the elevating guide pipe 200, the elevating guide pipe 200 can be coupled to the upper supporting bar 110 together with the bearing pipe 300.

When the first unit or barb 401 rises and the lower end reaches the vicinity of the lower end of the lifting guide pipe 200, the lifting / And the upper ends of the barbs 402 are connected to each other.

Considering that the height from the ground where the tripod 100 is mounted to the upper support 110 of the tripod 100 is about 1.2 m to 1.4 m, the length of each unit rod 401, 402, 403 is set to about 1 m .

Although a maximum of three unit rods 401, 402, and 403 constituting the lifting and lowering rod 400 is illustrated in the drawing, it is also possible to prepare additional units according to the distance from the ground on which the tripod 100 is mounted to the bottom of the bridge It can be understood that it is possible.

The unit threaded rods 401, 402, and 403 have a male threaded portion 410 formed over the entire length thereof. The circular threaded rod is processed to form the male threaded portion 310 over the entire length, Can be used.

The male threaded portions 410 formed on the unit threaded rods 401, 402, and 403 are configured to form a series of connected spirals when the unit threaded rods 401, 402, and 403 are connected.

The threaded portion 310 of the unit threaded rods 401, 402, and 403 and the female threaded portion 510 of the nuted portion 500 may be formed of a triangular screw, a trapezoidal thread, or a square screw, It is preferable to form it by a round screw.

The unit threaded rods 401, 402, and 403 are provided with connection threaded protrusions 420 formed at the upper end thereof and connection threaded grooves 430 formed at the lower end thereof to be connected to each other.

A connection screw hole 810 formed at the lower end of a sensor rod 800 to be described later is formed in the connection screw projection 420 of the unit screw rod 401 located at the uppermost one of the plurality of units or the bosses 401, 402, Respectively.

The plurality of unit threaders 401, 402, and 403 constituting the lifting and lowering rod 400 may be formed of a round bar or a pipe.

When the unit threaded rods 401, 402, 403 are formed as a round bar, the connecting threaded projections 420 and the connecting threaded grooves 430 are cut at the upper and lower ends of the unit threaded rods 401, When the unit threaded rods 401, 402 and 403 are formed of pipes, the plug having the connecting threaded protrusion 420 is inserted and fixed to the upper ends of the unit threaded rods 401, 402 and 403, And the lower end flaps in which the connecting thread grooves 430 are formed are inserted and fixed to the lower ends of the unit bosses 401, 402, 403.

A counterweight 440 may be coupled to the lower end of the lifting / lowering bar 400 to provide a vertical downward load so that the lifting / lowering bar 400 maintains a stable posture.

The counterweight 440 is coupled to the lower end of the unit screw rod positioned at the lowermost end of the unit bar or the bar that constitutes the lifting and lowering bar 400. [

For example, in the case of using one unit threaded rod 401 as shown in FIG. 6A, three unit threaded rods 401, 402, and 402 are provided at the lower end of the unit threaded rod 401 as shown in FIG. 403 are used, when two unit threaded rods 401 and 402 are used at the lower end of the unit threaded rod 403 as shown in FIG. 6 (c), the counterweight 402 440).

That is, the counterweight 440 has a connecting thread projection 441 formed at its upper end and is fastened to the connecting thread groove 430 formed at the lower end of the unit threaded rods 401, 402, 403, (Not shown).

The nut member 500 forms ring grooves R1 and R2 along the circumference on the inner circumferential surface of the bearing hole 310 and the outer circumferential surface of the nut member 500 of the bearing tube 300, Ring (R) is inserted into the bearing pipe (300) without being arbitrarily detached from the bearing pipe (300).

The nut member 500 is configured to be horizontally rotatable without inserting a bearing (not shown) between the nut member 500 and the bearing hole 310 of the bearing pipe 300, It is possible.

When the lifting and lowering rod 400 is moved up and down by the nut member 500 in order to rotate the nut member 500 to move the lifting and lowering rod 400 having the male screw portion 410 engaged with the female screw portion 510 of the nut member 500, A key groove 450 is formed on one side of the outer circumferential surface of the lifting / lowering rod 400 to cover the entire length of the lifting / lowering guide pipe 200, and at one side of the inner circumferential surface of the lifting guide pipe 200, The key 460 is inserted and the inner end of the key 460 is inserted into the key groove 450.

The inner diameter of the key groove 450 is preferably smaller than the diameter of the male threaded portion 410 of the lifting and lowering rod 400.

The key 460 may be a bolt fastened to a screw hole 461 formed in a peripheral wall of the elevation guide pipe 200. It is also preferable to use a hexagonal socket bolt, which is also called a wrench bolt, as the bolt constituting the key 460.

At this time, the outer end of the screw hole 461, that is, the outer circumferential end of the elevating guide pipe 200 is formed into a head insertion groove (not shown) having a margin to allow the head portion of the hexagonal socket bolt to be inserted and rotated, Is prevented from protruding from the outer circumferential surface of the lifting guide pipe (200).

The key groove 450 is formed in each of the unit bosses 401, 402, and 403 that constitute the lifting and lowering bar 400. When the unit bosses 401, 402, and 403 are connected to each other, .

The mount 600 may be formed of a single plate, but it is preferable that the mount 600 includes a pair of mount bodies 610 and 620 that are rotatably connected to each other as shown in the drawing.

Semicircular coupling holes 630 and 640 having an inner diameter corresponding to the outer diameter of the bearing tube 300 are formed at the joining ends of the mount bodies 610 and 620.

Connection portions 611 and 621 are formed on one side of the pair of mount bodies 610 and 620 and are engaged with bolt through holes 622 formed in a connecting portion 621 of the mount body 620 It is preferable that the connecting bolt 613 is pivotally moved from below to the screw hole 612 formed in the connecting portion 611 of the mount body 610 so as to be mutually rotatable and fixedly engaged.

The mount 600 may be fixed to the bearing pipe 300 by fastening bolts (not shown) passing through the side surfaces of the mount bodies 610 and 620 to the outer circumferential surface of the bearing pipe 300.

The mount 600 is formed in the shape of a box with the lower surface opened, and the cover 650 is detachably coupled to the side surfaces of the mount bodies 610 and 620 at the lower end.

The cover 650 is detachably coupled to the mount bodies 610 and 620 by fastening a bolt (not shown) passing through the lower end of the cover 650 to a screw hole (not shown) formed on a side surface of the mount bodies 610 and 620 can do.

The cover 650 has a through hole 651 formed on the upper surface thereof and through which the elevating and lowering bar 400 penetrates and a cutout portion through which the tip of the horizontal axis 720 of the rotating means 700, (Not shown).

The cutout portion 652 is formed in such a manner that the lower end thereof is opened so that the cover 650 can be engaged and detached in a state where the horizontal axis 720 of the rotating means 700 described later protrudes horizontally from the mount body 610 .

The cover 650 is fastened to screw holes (not shown) formed on the front, rear, left and right sides of the mount bodies 610 and 620 through bolts (not shown) along the lower, As shown in Fig.

The rotating means 700 includes a worm wheel 710 coupled to an upper end of the nut member 500, a horizontal shaft 720 horizontally installed on one side of the nut member 500, A worm 730 engaged with the worm wheel 710 and a handle engaging portion 740 formed at a distal end of the horizontal shaft 720 and a handle 750 attached to the handle engaging portion 740 ).

The worm wheel 710 may be integrally formed on the upper end of the nut member 500 and may be coupled to the upper surface of the nut member 500 by welding or screw connection.

Accordingly, the worm wheel 710 can be horizontally rotatably supported by the bearing tube 300 together with the nut member 500.

A through hole 711 is formed at the center of the worm wheel 710 and is coaxial with the female threaded portion 510 of the nut member 500 and through which the lifting and lowering rod 400 is vertically movable.

The through hole 711 is formed to have an inner diameter larger than the outer diameter of the male threaded portion 410 so that interference with the male threaded portion 410 of the vertical threaded rod 400 can be prevented.

The horizontal shaft 720 is protruded from the upper surface of the mount 600 and is rotatably supported by a pair of bearing pieces 721 having a bearing hole 722.

A metal bush or bearing can be inserted between the outer peripheral surface of the horizontal shaft 720 and the bearing hole 722.

The distal end of the horizontal shaft 720 protrudes forward through the cutout 652 of the cover 650.

The handle engagement portion 740 is formed in the shape of a rod having a square cross section.

The handle 750 includes a head portion 751 having a horizontal shaft coupling hole 752 of a square cross section that can be fitted to the handle coupling portion 740 and a lever 752 extending from one side of the head portion 751, And a grip portion 754 coupled to an end of the lever portion 753. The grip portion 754 has a handle 753,

The handle 750 may be a conventional crank handle, and it is desirable to use a foldable handle that can fold the handle 754 to facilitate portability and storage.

The sensor rod 800 is formed in a pipe shape and a connecting screw hole 810 is formed at a lower end thereof to fasten the connecting screw hole 810 of the sensor rod 800 and the connecting screw projection 420 of the elevating screw 400 And can be detachably coupled to the upper end of the lifting and lowering bar 400.

When a plurality of lifting and lowering rods 400 are connected to each other, the connecting screw holes 810 of the sensor rod 800 are fastened to the connecting screw projections 420 of the lifting and lowering rod 401 located at the uppermost position.

The connecting screw hole 810 may be formed by threading the inner circumferential surface of the sensor rod 800 constituted by a pipe and a plug formed with the connecting screw hole 810 may be inserted and fixed to the lower end of the sensor rod 800 It may be constituted by one.

The sensor 900 is inserted into the upper end of the sensor rod 800, and the sensing unit 910 protrudes to the upper end. Any conventional method of inserting the sensor 900 into the upper end of the sensor rod 800 and fixing the sensor 900 may be used.

The sensor 900 may be connected to a computer (not shown) such as a desktop computer or a notebook computer having a measurement program installed therein to construct a measurement system. The sensor 900 is connected to a power supply And may be connected to a battery (not shown) and a computer (not shown).

A battery for power supply may be mounted on the upper surface of the mount body 610, 620 or on the upper surface of the cover 660.

Preferably, the electric wire 920 is guided and supported by a wire guide 930 installed on an upper surface of the cover 650.

The electric wire guide 930 includes a pair of upper and lower guide rollers 931, a bracket 933 fixed to the upper surface of the cover 650, and a pair of guide rollers 931, And a support shaft 934 that supports the support shaft 934 as much as possible.

It is preferable that the guide roller 931 use a groove roller having a semicircular guide groove 932 formed along the outer circumferential surface thereof and corresponding to the outer diameter of the wire 920.

The bracket 933 can be fixed to the upper surface of the cover 650 by welding or screwing.

The sensor 900 may be directly inserted into the upper end of the sensor rod 800, but it may be inserted into the sensor socket 820 coupled to the upper end of the sensor rod 800, as shown in the drawing.

The sensor socket 820 includes a socket body 821 formed at the upper end of the sensor rod 800 and formed in a sleeve shape having an opened upper end to receive the sensor 900, And a wire draw-out hole 822 formed at the lower end and through which the wire 920 is drawn.

A plug 830 having a threaded protrusion 831 formed at the upper end of the sensor rod 800 is inserted in order to engage the sensor rod 800 with the socket body 821, It is possible to insert the plug 840 in which the female threaded portion 841 corresponding to the threaded portion 831 is formed and screw-fastened by the threaded projection 831 and the female threaded portion 842. [

Therefore, the sensor 900 is installed in the socket 820 coupled to the upper end of the sensor rod 800, so that the sensor 900 is firmly installed, and the electric wire 920 is mounted on the peripheral wall of the socket body 821 And is guided and guided by the wire guide 930 at the lower end thereof, so that it is possible to prevent the wire from being shaken by the wind and to prevent the measurement from being impossible due to poor contact or disconnection do.

Also, although the electric wire 920 is illustrated as a single sheet in the drawing, it includes both a power supply wire and a signal transmission wire. In the process of implementing the present invention, it is also possible to insulate the electric power line for power supply and the electric wire for signal transmission into one insulation cover.

In this case, the cover 650 is not a component requiring precision, but a worm wheel (not shown) is used as the horizontal checking means 1000. In this case, the horizontal checking means 1000 is constructed by mounting a leveling device on the upper surface of the cover 650, For protecting components such as the worm 530 and the worm 530 from being injured,

The vertical support plate 110 of the tripod 100 and the mount 600 can not be accurately identified because the thin steel plate is manufactured by bending the upper plate 100 and the lower plate 100. As a result, It can not be confirmed.

The horizontal confirmation means 1000 according to the present embodiment includes a vertical support 1010 having a lower end coupled to the upper surface of the mount body 620 on one side of the mount 600, A horizontal body 1020 provided parallel to the upper surface of the mount body 620 and having left and right horizontal elongated holes 1021 formed to be elongated in the left and right direction and a front and rear horizontal elongated hole 1022 elongated in the forward and backward directions, Right and left horizontally transparent pipes 1030 provided in the front and rear horizontal slots 1022 and horizontally and horizontally symmetrically with respect to an intermediate portion thereof and horizontal right and left horizontal confirmation lines 1031 disposed in the front and rear horizontal slots 1022, Horizontal horizontal confirmation liquid 1050 injected in such a manner that left and right horizontal confirmation bubbles 1051 are formed in the left and right horizontal transparent tubes 1030, And the front and rear horizontal transparent tubes 1040 So that the horizontal body 1020 can be protruded from the upper surface of the cover 650. The front and rear horizontal confirmation liquid 1060 is injected so as to form a front and back horizontal confirmation bubble 1061 in the cover 650, And a leveling protrusion hole 1070 formed in the upper surface of the base body 1010.

The horizontal checking means 1000 includes a vertical support 1010 at a right angle to the upper surface of the mount body 620 and a horizontal body 1020 parallel to the upper surface of the mount body 620 at the upper end of the vertical support 1010 So that the level of the mount body 620 can be accurately confirmed by the horizontal checking means 1000. [

The mounting of the vertical support 1010 with respect to the mount body 620 is performed by mounting a plurality of bolts 1013 passing through the plurality of bolt through holes 1011 formed in the mount body 620 from the bottom to the plurality of bolt through holes 1011 formed in the lower surface of the vertical support 1010 in correspondence with the plurality of bolts 1011. [

The mount 600 including the upper support 110 and the mount bodies 610 and 620 of the tripod 100 can be installed in parallel and the elevation guide pipe 200 and the bearing pipe 300 can be mounted on the upper support 110 of the vertical support 1010 can be vertically installed on the upper support 110 and the nut 500 is inserted into the bearing pipe 300. Therefore, .

Also, in the point displacement measuring apparatus for bridges capable of performing precise measurement according to the present embodiment, it is possible to connect the three legs 120 together and to prevent the legs 120 from slipping or sagging even when the legs 120 are excessively opened So that it can be maintained in a stable posture without being deteriorated.

The safety support means 1100 includes a ring 1110 which is hooked to the lower end of the lower leg 122 of the three legs 120, a chain 1120 to which one end is connected to the ring 1110, And a turnbuckle 1130 connected between the turnbuckle 1130 and the turnbuckle 1130.

The ring 1110 may be formed as an elliptical ring as shown in the drawing, but it may be formed in a hook shape and detachably attached thereto.

The chain 1120 may be a loop chain having a plurality of rings connected to each other and may have a length sufficient to connect and support the legs 120 even when the leg 120 is wide open.

The turnbuckle 1130 includes a right knife bar 1140 having a chain link 1141 to which the chain 1120 is connected and a chain link 1151 to which the chain 1120 is connected at one end, A buckle handle 1120 provided with a female screw portion 1161 engaged with the right screw rod 1140 at one end and a female screw portion 1162 engaged at the other end with the left needle bar 1150, 1160).

The chain couplings 1141 and 1151 are formed with chain insert grooves 1144 and 1154 into which the rings constituting the chain 1120 are inserted and have split pieces 1143 and 1153 formed with pin insertion holes 1145 and 1155 The chain release prevention pins 1161 and 1171 to be inserted into the pin insertion holes 1145 and 1155 and the chain release prevention pins 1161 and 1171 And pin release prevention rings 1162 and 1172.

The chain release prevention pins 1161 and 1171 are provided with head portions and include ring insertion holes 1163 and 1173 through which the pin release prevention rings 1162 and 1172 are inserted.

Tightening nuts 1146 and 1156 are fastened to the right and left rods 1140 and 1150 to prevent the adjusted length from being changed after the length adjustment is completed.

Hereinafter, a process of measuring a point displacement of a bridge by a point displacement measuring apparatus for a bridge capable of precise measurement according to the present embodiment will be described.

The worm wheel 710, the horizontal shaft 720, and the worm wheel 710 constituting the tripod 100, the elevation guide pipe 200, the bearing pipe 300, the nut member 500, the mount 600, The worm 730 is assembled and the elevating and lowering rods 400 are installed in a plurality of unit bosses 401, 402, 403,... In consideration of the height from the ground to the measurement site of the bridge, that is, And a sensor rod 800 having a sensor 900 coupled thereto is prepared.

The first unit or bar 401 of the prepared plurality of units or bosses 401, 402, 403 ... is passed through the elevation guide hole 210 of the elevation guide pipe 200 so that the threaded portion 410 is inserted into the nut member The horizontal shaft 720 and the worm 730 are rotated in the clockwise direction when the handle 750 engaged with the handle coupling part 740 of the horizontal shaft 720 is turned clockwise, The worm wheel 710 engaged with the worm 730 rotates in the counterclockwise direction and the nut member 500 coupled to the worm wheel 710 rotates in the counterclockwise direction, The unit threaded rod 401 is raised by the screw action of the portion 510 and the male threaded portion 410 engaged therewith.

At this time, a frictional force acts between the female threaded portion 510 and the male threaded portion 410, so that the rotational force of the nut member 500 is transmitted to the first unit threaded rod 401, Since the key groove 450 is formed in the entire length of the lifting guide pipe 200 and the key 460 is coupled to the peripheral wall of the lifting guide pipe 200, the first unit screw 401 is lifted without rotating together with the nut member 500 do.

When the upper end of the first unit 401 protrudes from the upper surface of the cover 650, the rotation of the handle 750 is stopped.

The upper end of the first unit or the boss rod 401 is connected to the upper end of the first unit boss 401 in consideration of the height of the tripod 100, the height of the cover 220, It is desirable to set the height to such an extent that the joining operation can be conveniently performed.

The bridge 120 of the tripod 100 is unfolded and carried by carrying the bridge displacement measuring apparatus for bridge capable of precise measurement according to the present embodiment prepared as described above to the lower portion of the bridge 10 to be measured ).

The leg 120 of the tripod 100 is opened and the length of each leg 120 composed of the upper leg 121 and the lower leg 122 is adjusted to align the desired height with the desired height.

At this time, it is possible to install more accurately by checking the horizontal by the horizontal checking means 1000.

That is, in the process of adjusting the legs 120 of the tripod 100, the left and right horizontal transparent tubes 1010, which are coupled to the upper surface of the vertical support 1010 and mounted on the horizontal body 1020 protruding from the upper surface of the cover 650, Horizontal horizontal confirmation lines 1031 of the front and rear horizontal transparent confirmation tubes 1030 and 1030 and left and right horizontal confirmation bubbles 1051 of the left and right horizontal confirmation fluids 1050, 1041 and the front and back horizontal confirmation liquid 1060 can be confirmed by the front and back horizontal confirmation bubble 1061.

Here, the leveling body 1020 is vertically installed on the upper surface of the mount body 620 of the mount 600, the mount body 620 is installed horizontally on the upper support platform 110 of the tripod 100, The nut member 500 and the bearing tube 300 are installed vertically to the upper support table 110 of the tripod 100. The nut member 500 is installed horizontally rotatably on the bearing tube 300, Is vertically guided to the elevation guide pipe 200 and is engaged with the nut member 500. Since the sensor rod 800 is coupled to the elevating and lowering rod 400, The horizontal state of the upper support platform 110 and the mount 600 of the tripod 100 and the vertical state of the lift guide pipe 200 and the bearing pipe 300 and the vertical state of the nut member The vertical state of the lifting / lowering rod 400 and the vertical state of the sensor rod 800 can be confirmed.

Therefore, the sensor rod 800 can be accurately aligned vertically, and as a result, the accuracy of measurement of the point displacement of the bridge by the sensor 900 coupled to the upper end of the sensor rod 800 can be improved.

The first unit and the connecting rod 408 of the upper end of the bar 401 are fastened to the connecting screw hole 810 at the lower end of the sensor bar 800, 401) (see Fig. 1).

When the upper end of the sensor 800 coupled to the upper end of the sensor rod 700 does not contact the bottom of the bridge 200, the handle 550 is rotated to rotate the horizontal axis 720 and the worm 730 clockwise The worm wheel 710 engaged with the worm 730 is rotated in the counterclockwise direction and the nut member 500 coupled to the worm wheel 710 is rotated in the counterclockwise direction, The first unit threaded rod 401 is raised by the screw action of the threaded portion 410 engaged with the first unit threaded rod 401 and the sensor rod 800 coupled to the upper end of the first unitized threaded rod 401 ascends do.

In this case, since the key unit 450 and the key 460 are provided on the first unit 401 and the elevation guide pipe 200, the first unit threaded rod 401 is rotated together with the nut member 500 The lifting operation of the first unit screw rod 401 by the male screw portion 410 and the female screw portion 510 is smoothly performed.

As shown in FIG. 6 (a), according to the height from the ground on which the tripod 100 is mounted to the lower surface of the bridge 10, the first unit rods 401 and the sensor rods 800 It is not necessary to further connect the unit rods 402, 403, ... when the sensing portion 910 of the sensor 900 contacts the lower surface of the bridge 10. [

In the case where the sensing unit 910 of the sensor 900 does not contact the lower surface of the bridge 10 with only the first unit bar 401 and the sensor bar 800 coupled thereto, 6 (b) and 6 (c), the sensing unit 910 of the sensor 900 is connected to the bridge 10 In the present invention.

When connecting the plurality of units or the bosses 401, 402, 403, etc., when the first unit boss 401 is raised and the lower end thereof is close to the lower surface of the upper support base 110 of the tripod 100 And the second unit threaded rod 402 is positioned below the first unit threaded rod 401 and the connecting threaded projection 420 at the upper end of the second unitized threaded rod 402 is positioned at the bottom of the first unit threaded rod 401 The first unit threaded rod 401 and the second unit threaded rod 402 are connected to each other and the third unit threaded rod 403 is connected to the second unitized threaded rod 402, And the second unit is fixed to the connecting thread groove 430 at the lower end of the second unit threaded rod 402 by positioning the second unit threaded rod 402 at the upper end of the second unit threaded rod 402 402) and the third unit (403).

At this time, the key grooves 450 formed on the unit thread rods 401, 402, and 403 are made to coincide with each other.

When the upper connecting thread projection 420 is completely fastened to the lower connecting thread groove 430 in the process of manufacturing the unit rods 401, 402 and 403 of the lifting and lowering rod 400, The key grooves 450 can be made to coincide with each other when a plurality of unit bosses 401, 402, and 403 are connected to each other without performing an operation of matching the key groove 450 separately.

The lower end of the first unit thread bar 401 is moved to the lower end of the nut member 500 by the upward movement as described above in the state where the second unit thread bar 402 is connected to the first unit thread bar 401 The threaded portion 410 of the second barrel unit 402 is engaged with the female threaded portion 510 of the nut member 500 until the first unit barrel 401 exits the nut member 500 The first and second unit threaded rods 401 and 402 are simultaneously engaged with the female threaded portion 510 of the nut member 500 so that the first and second unit threaded rods 401 and 402 are engaged with each other, So that it is in a connected state.

Likewise, the operation between the second unit, the barb 402, the third barb 403 and the subsequent barbars will be as described above.

When the connection of the necessary units or rods 401, 402, 403 ... is completed, when only the lowest unit or rods, that is, one unit rods 401 are used, 402 and 403 are used at the lower end of the second unit and the lower bar 402 in the case of using two unit barbs 401 and 402, The center of gravity of the entire apparatus can be positioned below the upper support platform 110 of the tripod 100 by coupling the counterweight 440 to the lower end of the tripod 100. [

As a result, the apparatus can be stably maintained and the deterioration of the measurement quality can be prevented.

The coupling of the counterweight 440 to the lower end of the lower end unit and the lower ends of the bosses 401, 402, 403 ... is achieved by connecting threaded grooves 430 formed at the lower ends of the unit bosses 401, 402, 403, By fastening the connecting screw protrusion 441 formed on the upper end of the counterweight 440. [

In this way, a plurality of units or rods 401, 402, 403 are connected according to the height from the ground on which the tripod 100 is mounted to the lower surface of the bridge 10, The sensor 900 installed on the upper end of the sensor rod 800 rises and the sensing unit 910 contacts the lower surface of the bridge 10 to measure the point displacement of the bridge.

The measurement signal measured by the sensor 900 may be transmitted to the computer via the wire 920.

By utilizing the point displacement measurement information of the bridge by the sensor 900, the bridge can be more efficiently managed.

In the meantime, in mounting the tripod 100, the three legs 120 are connected to each other by using the safety support means 1000 so that the tripod 100 can be stably mounted even when the leg 120 is excessively opened .

That is, when the tripod 100 is mounted on the ground by widening the three legs 120, the turnbuckle 1130 that connects the chain 1120 to the hook 1120 attached to the lower leg 122 The three legs 120 can be firmly connected by adjusting the entire length including the chain 1120 and the turnbuckle 1130.

In adjusting the overall length including the chain 1120 and the turnbuckle 1130, the buckle handle 1160 of the turnbuckle 1130 is rotated so that the threaded portions 1161 and 1162 at both ends, the right threaded rod 1140, The right threaded rod 1140 and the left threaded rod 1150 are moved in opposite directions to each other by the screw action of the right and left threaded rods 1150 and 1150, The length of the turnbuckle 1130 can be adjusted. As a result, the total length of the turnbuckle 1130 including the chain 1120 connected to both ends of the turnbuckle 1130 can be adjusted .

By adjusting the overall length including the chain 1120 and the turnbuckle 1130 in correspondence with the angle at which the three legs 120 are opened in this way, even if the three legs 120 are excessively widened, The tripod 100 can be stably and stably mounted without slipping or sagging.

Therefore, the bridge point displacement can be precisely measured as the tripod 100 is firmly and stably mounted on the ground.

In connecting the chain 1120 and the turnbuckle 1130, the elliptical ring constituting the chain 1120 is inserted into the chain insertion grooves 1144 and 1154 of the chain coupling holes 1141 and 1151, 1171 by inserting the pin release prevention rings 1162, 1172 into the ring insertion holes 1163, 1173 of the chain release prevention pins 1161, 1171 by inserting the chain release prevention pins 1161, Can be connected to the turnbuckle 1130 without any deviation.

When the chain 1120 and the turnbuckle 1130 are separated from each other, the pin release prevention rings 1162 and 1172 are pulled out from the ring insertion holes 1163 and 1173 of the chain release prevention pins 1161 and 1171, The chain 1120 and the turnbuckle 1130 can be separated by pulling out the chain 1120 from the pin insertion holes 1145 and 1155 and pulling the chain 1120 out of the chain insertion grooves 1144 and 1154.

The point displacement measuring apparatus for a bridge capable of precisely measuring according to the present embodiment as described above includes a plurality of unit shafts 401, 402, and 403 corresponding to the height from the ground on which the tripod 100 is mounted to the lower surface of the bridge 10 The length of the sensor rod 800 can be made as short as possible by connecting the lifting and lowering rod 400 made up of the sensor rod 800 and the sensor rod 800 connected to the first unit rod 401. Therefore, It is possible to prevent warping of the wafer 800 and deterioration of the measurement quality due to the warping.

In addition, when the plurality of units or rods 401, 402, 403, ... are connected, the counterweight 440 is coupled to the lower end of the unit threaded rods, It is possible to stably maintain the apparatus and prevent deterioration of the measurement quality.

Since the worm wheel 710 having the nut member 500 coupled thereto and the worm 730 engaged with the worm wheel 710 are provided as the means for rotating the nut member 500 engaged with the lifting and lowering rod 400, The worm wheel 710 does not rotate as long as the worm 730 does not rotate even if vibration occurs in the sensor rod 800 connected to the worm gear 400. This makes it unnecessary to provide the up / Is simple and easy to use.

Also, since the sensor rod 900 can be vertically installed by the horizontal checking means 1000, it is possible to improve the precision of the bridge point displacement measurement by the sensor 900 coupled to the upper end of the sensor rod 800.

Further, when the tripod 100 is mounted on the tripod 100, the tripod 100 can be rigidly and stably mounted on the ground by connecting the three legs 120 by the safety support means 1000, .

FIGS. 7 to 9 show a modification of the sensor rod 800. FIG.

In this modification, the sensor rods 800 are constructed by a plurality of unit rods 801, 802, 803, 804, 805 which can be detached and slidable with respect to each other.

That is, the length of the unit rods 801, 802, 803, 804, and 805 is expanded and contracted according to the height from the ground where the tripod 100 is mounted to the lower surface of the bridge 10, And the length of the plurality of unit rods 801, 802, 803, 804, and 805 is shrunk to the maximum during storage and transportation, thereby enabling easy storage and transportation.

The unit rods 801, 802, 803, 804, and 805 are configured to be slidably inserted into unit rods located in a lower-right room in the upper-right room.

That is, the unit rods 801, 802, 803, 804, and 805 are configured such that the outer diameter of the unit rods located in the upper right room has a slidable tolerance corresponding to the inner diameter of the unit rods located directly below.

The unit rods 802, 803, and 804 in the upper-right room are formed on the upper outer circumferential surfaces of the unit rods 801, 802, 803, and 804 except for the unit rods 805 located at the uppermost one of the unit rods 801, 802, 803, , And 805 are fixed to the unit bag tightening tool 850.

The unit bag tightening tool 850 covers the upper ends of the unit rods 801, 802, 803, and 804 and a bolt through hole 851 formed at one side of the upper end of the peripheral wall of the unit rods 801, 802, A nut 854 coaxially coupled to one of the bolt through holes 851 and 853 at one side of the circumferential wall of the fixing ring 852 and a nut 854 coupled to the bolt through hole 853, And tightening bolts 855 tightened to the outer surfaces of the unit rods 802, 803, 804, and 805, respectively.

The nut 854 may be formed by forming a female threaded portion directly on the circumferential wall of the retaining ring 852. In this case, the fastening force of the bolt 855 to the nut 854 may be reduced, It is preferable that the nut portion 854 is formed by embedding a nut 854a in the peripheral wall of the stationary ring 852 as shown in the drawing.

At this time, a protruding portion 854b is formed in the peripheral wall of the stationary ring 852 at a portion where the nut 854a is embedded.

Also, when the fixing ring 852 is formed of a metal material, the nut 854a can be joined to the fixing ring 852 by welding.

The fastening bolt 855 preferably has a so-called 'screw bolt' with a handle so that it can be turned without using a separate tool.

A frictional pad 856 such as rubber or synthetic resin having a large frictional force is attached to the tip of the tightening bolt 855 in order to increase the adhesion between the tip of the tightening bolt 855 and the outer circumferential surface of the unit rods 802, 803, 804, .

A coupling protrusion 856a formed in the friction pad 856 is inserted into the coupling groove 855a formed at the tip of the tightening bolt 855 in order to engage the friction pad 856 at the tip of the tightening bolt 855, It is preferable to apply an adhesive agent between the engaging groove 855a and the engaging projection 856a.

The sensor rods 800 described above are formed by connecting the unit rods 802, 803, 804, 805 to the unit rods 801, 802, 805 according to the height from the ground where the tripod 100 is mounted to the lower surface of the bridge 10, 803 and 804 so as to adjust the overall length of the unit rods 801, 802, 803, 804 and 805. The unit rods 802, 803, 804, The entire unit rods 801, 802, 803, 804 and 805 can be formed into sensor rods 800 having a desired length by fixing the rods 801, 802, 803 and 804 to the bottoms of the bridges 10 So that it can be adjusted to an appropriate length according to the height.

When the unit rods 802, 803, 804 and 805 are fixed to the unit rods 801, 802, 803 and 804 by the unit bag tightening tool 850, when the tightening bolts 855 are turned in the tightening direction, The tightening bolt 855 advances so that the tip end of the tightening bolt 855 is brought into close contact with the outer peripheral surface of the unit rods 802, 803, 804, and 805.

The frictional force between the distal end of the tightening bolt 855 and the outer circumferential surfaces of the unit rods 802, 803, 804, and 805 is increased so that the unit rods 801 802, 803, and 804 and the unit rods 802, 803, 804, and 805 can be firmly fixed.

The unit bolts 802, 803, 804 and 805 are fixed to the unit rods 801, 802, 803 and 804 and the tightening bolts 855 are retracted when the tightening bolts 855 are turned in the unwinding direction, The unit rods 802, 803, 804 and 805 can be slid with respect to the unit rods 801, 802, 803 and 804, respectively, since they are spaced from the outer circumferential surfaces of the rods 802, 803, 804 and 805.

When the sensor rods 800 are stored or transported, the unit rods 802, 803, 804, and 805 are slid and inserted into the unit rods 801, 802, 803, 803, 804, and 805 can be easily stored or transported by shortening the entire length of the sensor rod 800 as much as possible.

10 and 11 show a modification of the sensor.

The sensor 900 according to the present modification includes a ring-shaped carrier 941 formed in a ring shape, a contact portion 942 coupled to an upper end of the ring-shaped carrier 941 and contacting the lower surface of the bridge 10, A ring type displacement gauge 940 including a sensing part 943 coupled to the lower end of the sensing rod 941 and a coupling rod 944 coupled to the lower end of the sensing part 943 and coupled to the upper end of the sensor rod 800, Lt; / RTI >

The ring-shaped carrier 941 is made of elastic metal or synthetic resin and elastically deformed according to the amount of displacement generated when the contact portion 942 comes into contact with the lower surface of the bridge 10 and is connected to the sensing portion 943 .

The sensing unit 943 is connected to a wire 920 for transmitting a sensing value. At this time, the wire 920 can be wired through the inside of the sensor rod 800 by forming the wire through hole 945 through which the wire 920 can pass at the central portion of the coupling thread 944.

The coupling rod 944 is adapted to be screwed on the upper end of the sensor rod 800 and a threaded portion 811 corresponding to the coupling rod 944 is formed on the upper inner circumferential surface of the sensor rod 800.

When the point displacement of the bridge 10 occurs in a state in which the contact portion 942 is in contact with the lower surface of the bridge 10, the ring-shaped displacement gauge 940 according to the present modification example elastically deforms the ring- The sensing unit 943 senses the amount of displacement and transmits the sensed value through the wire 920. The sensing unit 943 senses the amount of displacement and transmits the sensed value through the wire 920. [

In this modification, by using the ring type displacement gauge 940 having a good response characteristic as the sensor 900, the point displacement of the bridge 10 can be measured more accurately and stably.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Tripod 110: Upper support
120: leg 200: lift guide pipe
300: bearing tube 400: lifting and lowering bar
500: nut member 600: mount
700: rotating means 800: sensor rod
900: Sensor 1000: Horizontal confirmation means
1100: Safety support means

Claims (2)

A tripod 100 having an upper end support 110 and an upper end 120 rotatably mounted on the upper end of the upper support 110, ;
An elevation guide pipe 200 inserted into the installation hole 111 of the upper support platform 110 and installed vertically and having an elevation guide hole 210;
A bearing tube 300 coupled to an upper end of the lifting guide pipe 200 and having a bearing hole 310;
A lifting and lowering rod 400 vertically installed to penetrate through the lifting guide hole 210 and the bearing hole 310 and having a male screw portion 410 formed on an outer peripheral surface thereof;
A nut member (500) rotatably installed in the bearing hole (310) and having a female threaded portion (510) engaged with the male threaded portion (410);
A cover 650 which is formed in a box shape with a bottom opened and a lower end detachably coupled to the side surfaces of the mount bodies 610 and 620, a mount body 610, 620 coupled to the upper end of the bearing tube 300, A mount 600 comprising:
Rotating means (700) for rotating the nut member (500);
A sensor rod 800 coupled to an upper end of the lifting / lowering rod 400;
A sensor 900 coupled to an upper end of the sensor rod 800 to contact a bottom surface of the bridge to measure a point displacement of the bridge; And
The horizontal state of the upper support plate 110 of the tripod 100 and the mount 600 and the nut member 500 and the vertical state of the lifting guide pipe 200 and the bearing pipe 300, (1000) which can be installed vertically and precisely; A point displacement measuring apparatus for a bridge,
And a counterweight 440 coupled to the lower end of the lifting and lowering bar 400 to lower the center of gravity,
The lifting and lowering rod 400 is composed of a plurality of unit rods that are connectable to each other,
Connection thread projections 420 and 441 are formed on the upper ends of the plurality of unit screw rods and the upper ends of the counterweight 440,
A connection screw groove 430 is formed at a lower end of the plurality of unit screw rods to fasten the connection screw protrusions 420 and 441,
A connection screw hole 810 is formed at the lower end of the sensor rod 800 to fasten the connection screw projection 420,
A key groove 450 formed on one side of an outer circumferential surface of a plurality of unit screw rods constituting the lifting and lowering rod 400 and an inner end portion passing through one side of the inner circumferential surface of the lifting guide tube 200, And the key groove 450 is vertically aligned when the unit thread bar is connected by the connecting screw protrusion 420 and the connecting screw groove 430,
The rotating means 700 includes a worm wheel 710 coupled to the upper surface of the nut member 500, a horizontal shaft 720 horizontally installed to be rotatable on one side of the nut member 500, A worm 730 coupled to the worm wheel 710 and coupled to the worm wheel 720, a handle coupling 740 formed at the distal end of the horizontal shaft 720, And a handle (750) coupled in a state of idle to the state,
The horizontal checking unit 1000 includes a vertical support unit 1010 having a lower end coupled to the upper surface of the mount body 620 on one side of the mount 600, A horizontal body 1020 provided parallel to the upper surface of the mount body 620 and having a horizontally elongated horizontal hole 1021 formed to be elongated in the left and right direction and a longitudinal horizontal elongated hole 1022 elongated in the longitudinal direction, Left and right horizontal transparent tubes 1030 provided in left and right horizontal elongated holes 1021 and provided with left and right horizontal confirmation lines 1031 displayed symmetrically with respect to an intermediate portion thereof and horizontal transparent tubes 1030 provided in the front and rear horizontal elongated holes 1022, A front and rear horizontal transparent pipe 1040 having front and rear horizontal confirmation lines 1041 which are symmetrically displayed in the front and rear directions of the left and right horizontal transparent tubes 1030, (1050), the front-rear horizontal transparent The front and rear horizontal confirmation liquid 1060 injected so as to form the front and back horizontal confirmation bubble 1061 in the cover body 1040 and the front and rear horizontal confirmation liquid 1060 formed on the top surface of the cover 650, And a leveling projection hole 1070,
A loop 1110 which is hooked on the lower end of the lower leg 122 of the three legs 120 and a loop type which has a plurality of hooks connected to each other and which can be connected to the legs 120 even when the legs 120 are widely opened And a turnbuckle 1130 connected between the chain 1120 and having one end connected to the ring 1110,
The turnbuckle 1130 includes a right knife bar 1140 having a chain link 1141 to which the chain 1120 is connected and a chain link 1151 to which the chain 1120 is connected at one end, A buckle handle 1120 provided with a female screw portion 1161 engaged with the right screw rod 1140 at one end and a female screw portion 1162 engaged at the other end with the left needle bar 1150, 1160)
The chain couplings 1141 and 1151 are formed with chain insert grooves 1144 and 1154 into which the rings constituting the chain 1120 are inserted and have split pieces 1143 and 1153 formed with pin insertion holes 1145 and 1155 The chain release prevention pins 1161 and 1171 to be inserted into the pin insertion holes 1145 and 1155 and the chain release prevention pins 1161 and 1171 Including pin release lock rings 1162 and 1172,
A safety supporting means 1100 for connecting the three legs 120 and allowing the legs 120 to be held in a stable posture without slipping or sagging when the legs 120 are too wide open Wherein the bridge is disposed on the bridge. delete

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