CN203443850U - Shear box for direct shear apparatus for preventing arching of upper half box - Google Patents
Shear box for direct shear apparatus for preventing arching of upper half box Download PDFInfo
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- CN203443850U CN203443850U CN201320564183.0U CN201320564183U CN203443850U CN 203443850 U CN203443850 U CN 203443850U CN 201320564183 U CN201320564183 U CN 201320564183U CN 203443850 U CN203443850 U CN 203443850U
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Abstract
The utility model discloses a shear box for a direct shear apparatus for preventing arching of an upper half box, and belongs to the technical field of direct shear apparatuses. The shear box is characterized by comprising the upper half box and a lower half box, which are matched with each other, wherein a slide mechanism is arranged at the bottom of the lower half box; pulley mechanisms are respectively arranged on the two outer side walls of the upper half box in the moving direction, an arching prevention rod is arranged on the upper side of each pulley mechanism and has two ends fixedly connected with a bracket of the direct shear apparatus through fixing brackets. The shear box provided by the utility model is reasonable in structure, convenient to use and accurate in detection, and is used for the direct shear apparatus.
Description
Technical field
The utility model relates to a kind of Geotechnical Engineering measuring equipment, more particularly, relates in particular to a kind of direct shear apparatus shear box that prevents that first box from arching upward.
Background technology
In Geotechnical Engineering, the intensity index of soil is mainly used in the calculating such as Stability of Earth Slopes, foundation bearing capacity and soil pressure.Direct shear test is a kind of wherein method that obtains such index.At present, the feature such as direct shear test is easy with its sample preparation, instrument is simple, easy to operate, engineering application experience is abundant, plays an important role in Geotechnical Engineering at home.The instrument that direct shear test adopts is direct shear apparatus.
In long-term production practices, we find: adopt existing direct shear apparatus to exist some obvious defects when carrying out the direct shear test of pan soil (as unconfined compressive strength be 0.3～1.5MPa cohesive soil or silt), main manifestations is that first box of shear box in shear history is arched upward.Now, sample will no longer in one plane be sheared, but has occurred a shear zone in uneven thickness, and the stress of sample also becomes complicated unclear simultaneously.From test figure, the result that this phenomenon being arched upward due to first box causes is: (1) shear resistance on the low side, on the one hand can not be corresponding with other strength test result, and very large with empirical data also difference on the other hand; (2) test figure is discrete, and the relative coefficient of strength envelope is very little.
Obtain by analysis, tradition direct shear box occurs that in shear history the arched upward main cause of phenomenon of first box is: pan soil (especially including the pan soil of cementing lump) has stronger dilatancy, when sample is cut when swollen, sample produces friction force upwards to first box madial wall, therefore causes first box to be arched upward.In the structural design of tradition direct shear box, lack a kind of device that first box is arched upward that limits, therefore can not adapt to the shear test of this class soil.In addition, direct shear apparatus producer is in the market in order to pursue production cost, and the weight of direct shear box is done lighter and lighter, when the weight of first box, can not offset thisly while cutting swollen trend, produces the phenomenon being arched upward.
Therefore, we wish to undergo technological transformation by the shear box in traditional direct shear apparatus, make the applicability of novel shear box expand to the category of pan soil direct shear test.
Utility model content
The purpose of this utility model is for above-mentioned the deficiencies in the prior art, provides a kind of rational in infrastructure, easy to use and detect and prevent accurately the direct shear apparatus shear box that first box arches upward.
The technical solution of the utility model is achieved in that a kind of direct shear apparatus shear box that prevents that first box from arching upward, comprise second box and first box of cooperatively interacting, in second box bottom, be provided with slide mechanism, wherein said first box is along being respectively equipped with pulley mechanism on two lateral walls of moving direction, described each pulley mechanism upside is equipped with anti-arch bar, and described anti-arch bar two ends are fixedly connected with direct shear apparatus support by fixed mount.
Above-mentioned a kind ofly prevent that in direct shear apparatus shear box that first box arches upward, described slide mechanism is comprised of two groups of ball guides that are arranged on second box bottom, described each ball guide by back up pad and along its length uniformly at intervals the steel ball in back up pad form; In back up pad, be provided with and each steel ball pilot hole one to one.
Above-mentioned a kind ofly prevent that in direct shear apparatus shear box that first box arches upward, described pulley mechanism is comprised of spaced at least two pulleys of along continuous straight runs; The anti-arch bar level of the same side pushes against and connects each pulley.
Above-mentioned a kind ofly prevent that in direct shear apparatus shear box that first box arches upward, described first box both sides are provided with the installation groove adapting with pulley.
Above-mentioned a kind ofly prevent that in direct shear apparatus shear box that first box arches upward, described fixed mount is comprised of the L bracket that is separately positioned on anti-arch bar both sides, is provided with the positioning through hole adapting with anti-arch bar in each L bracket.
Above-mentioned a kind ofly prevent that in direct shear apparatus shear box that first box arches upward, described anti-arch bar is circular steel pole.
The utility model adopts after said structure, by pulley mechanism and the anti-arch bar cooperatively interacting is set, realizes the object that effectively prevents first box arch in first box both sides.Compared with prior art, have advantages of following:
(1) according to the theory of < < soil test instrumentation method of calibration > > (SL116) and method to carrying out synthetical error analysis in conjunction with direct shear apparatus of the present utility model, the measuring accuracy that can obtain new instrument meets the good conclusion of repeatability of code requirement, test findings.
(2) the utility model produces different effects to different great soil groups in process of the test.To general soil, due to the trend that in shear history, first box is not arched upward, stop means is not had an effect, and the working control of new instrument and traditional instrument is identical with effect; And to pan soil, when trend that being arched upward appears in first box, the stop means that pulley and anti-arch bar form is had an effect immediately, and sample is limited in a flat inplane shear, the phenomenon that there will not be first box to be arched upward in test, the requirement of the more Pass Test principle of process control of instrument.
(3) by known to the process record of a large amount of contrast tests and Analysis on Results, adopt generality under new instrument condition of the present utility model soil test result identical with the test result under traditional instrument condition, and the test result of pan soil is compared and is tending towards accurately with reasonable with traditional instrument.It can be said that, be a kind ofly can be applicable to general native direct shear test in conjunction with new instrument of the present utility model, can be applicable to again the modified form instrument of pan soil direct shear test.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the utility model is described in further detail, but do not form any restriction of the present utility model.
Fig. 1 is decomposition texture schematic diagram of the present utility model.
In figure: second box 1, first box 2, installation groove 2a, slide mechanism 3, back up pad 3a, steel ball 3b, pulley mechanism 4, pulley 4a, anti-arch bar 5, fixed mount 6, L bracket 6a.
Embodiment
Consult shown in Fig. 1, a kind of direct shear apparatus shear box that prevents that first box from arching upward of the present utility model, comprise second box 1 and first box 2 of cooperatively interacting, in second box 1 bottom, be provided with slide mechanism 3, described slide mechanism 3 is comprised of two groups of ball guides that are arranged on second box 1 bottom, described each ball guide by back up pad 3a and along its length uniformly at intervals the steel ball 3b on back up pad 3a form; On back up pad 3a, be provided with the pilot hole one to one with each steel ball 3b.The slide mechanism 3 that adopts this structure, has stronger anti-pressure ability.
Meanwhile, at first box 2, along being respectively equipped with pulley mechanism 4 on two lateral walls of moving direction, particularly, described pulley mechanism 4 is comprised of spaced at least two the pulley 4a of along continuous straight runs; Anti-arch bar 5 levels of the same side push against and connect each pulley 4a.Installation for convenience of pulley 4a, is provided with the installation groove 2a adapting with pulley 4a in first box 2 both sides.The installation that can facilitate like this pulley 4a with and horizontal level regulate.Adopting and make pulley mechanism 4 and coordinate with anti-arch bar 5, is for fear of bringing outside friction force, the accuracy of impact experiment when the experiment into.Certainly, the structure of pulley mechanism 4 and installation site thereof, be not all unique, and structure also can adopt other can realize when compressing first box 2 can not bring the position limiting structure of outside friction force into.
Described each pulley mechanism 4 upsides are equipped with anti-arch bar 5, and for guaranteeing that anti-arch bar 5 has enough bending strengths, the anti-arch bar 5 in the present embodiment is preferably circular steel pole; Described anti-arch bar 5 two ends are fixedly connected with direct shear apparatus support by fixed mount 6; Described fixed mount 6 is comprised of the L bracket 6a that is separately positioned on anti-arch bar 5 both sides, is provided with the positioning through hole adapting with anti-arch bar 5 on each L bracket 6a.
During use, second box 1 tail end is connected with shearing gearing, is mainly test shearing force stable, at the uniform velocity is provided; First box 2 front ends are connected with dynamometer simultaneously, and guarantee that both center lines overlap and horizontal centring.Now, can place sample tests.
Above illustrated embodiment is preferred embodiments of the present utility model, only be used for facilitating explanation the utility model, not the utility model is done to any pro forma restriction, under any, in technical field, have and conventionally know the knowledgeable, if within not departing from the scope of technical characterictic that the utility model is put forward, utilize technology contents that the utility model discloses to do the local equivalent embodiment that changes or modify, and do not depart from technical characterictic content of the present utility model, all still belong in the scope of the utility model technical characterictic.
Claims (6)
1. a direct shear apparatus shear box that prevents that first box from arching upward, comprise second box (1) and first box (2) that cooperatively interact, in second box (1) bottom, be provided with slide mechanism (3), it is characterized in that, described first box (2) is along being respectively equipped with pulley mechanism (4) on two lateral walls of moving direction, described each pulley mechanism (4) upside is equipped with anti-arch bar (5), and described anti-arch bar (5) two ends are fixedly connected with direct shear apparatus support by fixed mount (6).
2. a kind of direct shear apparatus shear box that prevents that first box from arching upward according to claim 1, it is characterized in that, described slide mechanism (3) is comprised of two groups of ball guides that are arranged on second box (1) bottom, described each ball guide by back up pad (3a) and along its length uniformly at intervals the steel ball (3b) in back up pad (3a) form; In back up pad (3a), be provided with and each steel ball (3b) pilot hole one to one.
3. a kind of direct shear apparatus shear box that prevents that first box from arching upward according to claim 1, is characterized in that, described pulley mechanism (4) is comprised of spaced at least two pulleys of along continuous straight runs (4a); Anti-arch bar (5) level of the same side pushes against and connects each pulley (4a).
4. a kind of direct shear apparatus shear box that prevents that first box from arching upward according to claim 1, is characterized in that, described first box (2) both sides are provided with the installation groove (2a) adapting with pulley (4a).
5. a kind of direct shear apparatus shear box that prevents that first box from arching upward according to claim 1, it is characterized in that, described fixed mount (6) is comprised of the L bracket (6a) that is separately positioned on anti-arch bar (5) both sides, is provided with the positioning through hole adapting with anti-arch bar (5) in each L bracket (6a).
6. a kind of direct shear apparatus shear box that prevents that first box from arching upward according to claim 1 or 5, is characterized in that, described anti-arch bar (5) is circular steel pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320564183.0U CN203443850U (en) | 2013-09-11 | 2013-09-11 | Shear box for direct shear apparatus for preventing arching of upper half box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320564183.0U CN203443850U (en) | 2013-09-11 | 2013-09-11 | Shear box for direct shear apparatus for preventing arching of upper half box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203443850U true CN203443850U (en) | 2014-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320564183.0U Expired - Fee Related CN203443850U (en) | 2013-09-11 | 2013-09-11 | Shear box for direct shear apparatus for preventing arching of upper half box |
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| CN (1) | CN203443850U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062175A (en) * | 2014-06-25 | 2014-09-24 | 成都东华卓越科技有限公司 | Guiding-antirotation-antifriction device for shearing box |
| CN104075938A (en) * | 2014-06-25 | 2014-10-01 | 成都东华卓越科技有限公司 | Anti-upwarp device for shear box |
| CN108801770A (en) * | 2018-06-27 | 2018-11-13 | 西安科技大学 | A kind of simple direct shear apparatus of large size |
-
2013
- 2013-09-11 CN CN201320564183.0U patent/CN203443850U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062175A (en) * | 2014-06-25 | 2014-09-24 | 成都东华卓越科技有限公司 | Guiding-antirotation-antifriction device for shearing box |
| CN104075938A (en) * | 2014-06-25 | 2014-10-01 | 成都东华卓越科技有限公司 | Anti-upwarp device for shear box |
| CN108801770A (en) * | 2018-06-27 | 2018-11-13 | 西安科技大学 | A kind of simple direct shear apparatus of large size |
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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: 20140219 |