CN203811304U - Wood-structure building element nail-holding power measuring device - Google Patents
Wood-structure building element nail-holding power measuring device Download PDFInfo
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- CN203811304U CN203811304U CN201420168726.1U CN201420168726U CN203811304U CN 203811304 U CN203811304 U CN 203811304U CN 201420168726 U CN201420168726 U CN 201420168726U CN 203811304 U CN203811304 U CN 203811304U
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- cylinder
- spring
- nail
- deck
- holding ability
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Abstract
The utility model provides a wood-structure building element nail-holding power measuring device which is capable of performing the on-site measurement of the nail-holding power of a wood-structure building element rapidly, simply, and conveniently without damaging the element. The device comprises a cylinder. The cylinder is internally provided with a spring. One end of the spring is fixed on the cylinder while the other end of the spring is connected with a clamping plate which can move inside the cylinder along the axial direction of the cylinder. One end of a circular needle extending along the axial direction of the cylinder is fixedly connected with the other end of the spring or the clamping plate. A clamping seat is arranged on the clamping plate. The cylinder is provided with a clamping hook matched with the clamping seat. When the clamping hook hooks the clamping seat, the spring is in a load-bearing state; and when the clamping hook releases the clamping seat, the clamping seat and the circular needle move along the axis of the cylinder with the elastic force of the spring, thereby enabling the other end of the circular needle to extend out of the cylinder. At least a part of the wall of the cylinder is transparent, and the transparent part is provided with a scale used for measuring the length change of the spring.
Description
Technical field
What this technology related to is a kind of device of measuring timber buildings member nail-holding ability, belongs to timber buildings technical field of nondestructive testing.
Background technology
In the process of China's timber buildings maintenance and repairerment, the protection of timber structure and reinforcing are the most important things; And as the timber of biomaterial, through the infringement of long-term weathering and nature biotechnology, as easy as rolling off a log generation rotten with damage by worms, cause its physical and mechanical property to reduce, finally cause the damage of timber structure, some even serious threat to the security performance of building.
And that nail is connected to use in timber structure is very general, as adopting nail, roof boarding, floorboard be connected with beam, and in light-duty wooden, wall bone adopts skew nailing to be connected with base plate, and the stressed-skin construction of shear wall and temporary supporting all will use follows closely connection etc.Nail-holding ability is one of fundamental strength index of weighing nail connected node performance.The nail-holding ability (nail-holding ability, or nail-holding power, or screw-holding power) of timber refers to the ability that timber opposing nail is extracted.Timber has the performance of set nail, the friction force between nail-holding ability that is timber and nail.In the time of the man-to-man timber of nail, nail lumber fibre is around by separately because timber has elasticity and toughness, its can separated fiber to nail mineralization pressure, cause and resist the friction force that nail is extracted.
Traditional nail-holding power detection method is to carry out under the prerequisite of destroying target object, and it is the size that member is processed into standard, then measures at omnipotent test machine for mechanism with nail-holding ability fixture.Although the result that this method records is more accurate, oneself no longer has practical value to the test specimen after breakage detects conventionally, causes great waste.And in built timber buildings, member processing is blocked to measure be unpractical and pretty troublesome.In addition, this method detection time is long, condition is harsh, poor stability.Obviously, these destructive detection methods can not meet the demand of timber buildings member character assessment.
Summary of the invention
This technology provide a kind of can be in the situation that not destroying member to the nail-holding ability of timber buildings member carry out fast, simply, the timber buildings member nail-holding ability determinator of Site Detection easily, use this device to measure nail-holding ability, overcome existing nail-holding ability assay method length detection time, need to destroy member, condition harshness, poor stability, the loaded down with trivial details shortcoming of detection.
The timber buildings member nail-holding ability determinator of this technology, comprise a cylinder, spring is set in cylinder, one end of spring is fixed on cylinder, the other end of spring with can in cylinder, be connected along the axially movable clamp of cylinder, be fixedly linked along one end of the axially extended round needle of cylinder and the other end of spring or clamp; Deck is set on clamp; On cylinder, be provided with the grab coordinating with deck; In the time that grab hooks deck, spring is in stress; In the time that grab departs from deck, deck and round needle, under the effect of spring force, move along cylinder axis, and the other end of round needle is stretched out outside cylinder; At least a portion of cylindrical wall is transparent, has the scale for measuring spring length variations on transparent part.
Above-mentioned timber buildings member nail-holding ability determinator, described round needle is that diameter is 2.5mm, the draw point that length is 60mm.
Above-mentioned timber buildings member nail-holding ability determinator, described spring is extension spring.
Above-mentioned timber buildings member nail-holding ability determinator, grab swings the one end that is arranged on cylinder.
Above-mentioned timber buildings member nail-holding ability determinator, it also comprises can stretch in cylinder, overcomes the elastic force of spring and mobile loading pin vertically for promoting round needle.
The beneficial effect of this technology: use the process of this determinator mensuration nail-holding ability as follows.The elastic force that first overcomes spring promotes round needle, deck is moved, until grab catches on deck to grab.Then, the cylinder one end that can stretch out round needle is contacted with needing the member of measuring.Then touch grab, grab and deck are departed from, deck, clamp and round needle just move vertically under the effect of elastic force, and the other end of round needle just stretches out cylinder and injects in the member that needs to measure.Then the stretching while seeing that by scale now spring is with respect to free state or reduction length x.Can derive the actual nail-holding ability P of member according to elastic potential energy of the spring E=1/2kx2.K is the stiffness factor (claiming again stiffness coefficient or the coefficient of stiffiness) of spring.
So use this technology in test process, be not subject to the restriction in time place, easy to operate, instrument is lightly portable, and very little to the injury of timber buildings member, belongs to Non-Destructive Testing, and testing result is accurate.
Brief description of the drawings
Fig. 1 be timber buildings member nail-holding ability determinator at spring in free state schematic diagram.
Fig. 2 be determinator at spring in extended state schematic diagram.
Fig. 3 is the schematic diagram of determinator in the time that draw point stretches into member.
Embodiment
Referring to the timber buildings member nail-holding ability determinator shown in Fig. 1-3, extension spring 2 is set cylinder 1 is interior, the left end of spring is fixed on the right-hand member of left end cover plate 11, spring right-hand member with can in cylinder, be connected along the axially movable clamp 3 of cylinder, the right-hand member of the draw point 10 that is 2.5mm along the axially extended diameter of cylinder be fixed on clamp left side.At the right side of clamp Fixing clamp-seat 4.On right-hand member cover plate 12, swing and be connected with the grab 5 coordinating with deck.Cylinder left end has dismountable left cap 13, right-hand member has dismountable right cap 14.The central part of left end cover plate has the through hole 15 that draw point can pass freely through.In the time not using this determinator, for promote round needle overcome extension spring elastic force and vertically mobile loading pin 6 be generally placed in left cap.In cylindrical outer, be fixed with vertically transparent scale 7, see through scale and can see cylinder interior.Be fixed with supporting leg 8 in the left side of left end cover plate.
When extension spring is during in free state, referring to Fig. 1, the clamp place reference position of scale left end (initiating terminal of length) during with free state alignd.
While using this determinator, take off left cap, right cap.Take out loading pin, promote vertically draw point to the right by loading pin, make draw point overcome the pulling force of spring and move, until deck moves to grab place, then swing grab, hook deck (referring to Fig. 2) with grab.
Then the end contact of the supporting leg of this determinator and pretest member 9, then swing grab, make grab depart from deck, clamp and round needle are under the effect of spring, be moved to the left along cylinder axis, the left end of round needle stretches out cylinder by through hole 15 and injects in member 9 (referring to Fig. 3).Due to the resistance of member, the elastic force of spring can not discharge completely, and clamp there should be no return to scale left end place, and clamp can only stop at a certain position (being stop position) of leaving scale left end.Can read clamp corresponding scale x when the stop position by scale, this scale is exactly the tensile elongation x (with respect to free state) of spring.According to elastic potential energy of the spring E=1/2kx
2can derive the actual nail-holding ability P of member.This equipment applies in the Non-Destructive Testing of wood structures by simple spring energy principle, and the nail-holding ability detection of complicated and time consumption is before transformed into conveniently mode.This device is easy accurately, simple and quick.Its maximum feature is neither to destroy the primary characteristic of wooden material, is conducive to protection, maintenance and the reinforcing of timber buildings.
Claims (5)
1. timber buildings member nail-holding ability determinator, it is characterized in that: it comprises a cylinder, spring is set in cylinder, one end of spring is fixed on cylinder, the other end of spring with can in cylinder, be connected along the axially movable clamp of cylinder, be fixedly linked along one end of the axially extended round needle of cylinder and the other end of spring or clamp; Deck is set on clamp; On cylinder, be provided with the grab coordinating with deck; In the time that grab hooks deck, spring is in stress; In the time that grab departs from deck, deck and round needle, under the effect of spring force, move along cylinder axis, and the other end of round needle is stretched out outside cylinder; At least a portion of cylindrical wall is transparent, has the scale for the variation of measuring spring length on transparent part.
2. timber buildings member nail-holding ability determinator as claimed in claim 1, is characterized in that: described round needle is that diameter is 2.5mm, the draw point that length is 60mm.
3. timber buildings member nail-holding ability determinator as claimed in claim 2, is characterized in that: described spring is extension spring.
4. timber buildings member nail-holding ability determinator as claimed in claim 3, is characterized in that: grab swings the one end that is arranged on cylinder.
5. timber buildings member nail-holding ability determinator as claimed in claim 1, it is characterized in that: further comprising and can stretch in cylinder, overcome the elastic force of spring and mobile loading pin vertically for promoting round needle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420168726.1U CN203811304U (en) | 2014-04-04 | 2014-04-04 | Wood-structure building element nail-holding power measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420168726.1U CN203811304U (en) | 2014-04-04 | 2014-04-04 | Wood-structure building element nail-holding power measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203811304U true CN203811304U (en) | 2014-09-03 |
Family
ID=51450041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420168726.1U Expired - Fee Related CN203811304U (en) | 2014-04-04 | 2014-04-04 | Wood-structure building element nail-holding power measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203811304U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884456A (en) * | 2014-04-04 | 2014-06-25 | 南京林业大学 | Nail-holding ability measurement device for wood-structure building component |
-
2014
- 2014-04-04 CN CN201420168726.1U patent/CN203811304U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103884456A (en) * | 2014-04-04 | 2014-06-25 | 南京林业大学 | Nail-holding ability measurement device for wood-structure building component |
| CN103884456B (en) * | 2014-04-04 | 2015-10-28 | 南京林业大学 | Timber buildings component nail-holding ability determinator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140903 Termination date: 20170404 |