CN208621434U - Anti- soil sample eccentric compression strain controlling formula direct shear test instrument - Google Patents
Anti- soil sample eccentric compression strain controlling formula direct shear test instrument Download PDFInfo
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- CN208621434U CN208621434U CN201820331187.7U CN201820331187U CN208621434U CN 208621434 U CN208621434 U CN 208621434U CN 201820331187 U CN201820331187 U CN 201820331187U CN 208621434 U CN208621434 U CN 208621434U
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Abstract
The utility model discloses a kind of anti-soil sample eccentric compression strain controlling formula direct shear test instruments comprising shear box, pressure at right angle bringing device, horizontal pressure force bringing device, instrumentation table and instrument pedestal, shear box are made of upper shear box and lower shear box；The restricted upper shear box of the instrument platform seat tool track that shear box is moved along horizontal thrust direction in pedestal surfaces under the position limiting structure that horizontal thrust direction is moved and restriction；Pressure at right angle applying portion includes press perpendicular lever, counterweight, press perpendicular frame, pressure rod and pressure transmission lid；Horizontal pressure force bringing device includes pusher and steel loop, pushes lower shear box along tracks travel when pusher is pushed by external force, thrust direction is consistent with orbital direction.The utility model overcomes the defect of traditional strain controlling formula direct shear test instrument soil sample eccentric compression, improves accuracy, the reasonability of strain controlling formula direct shear test.
Description
Technical field
The utility model relates to geotechnical engineering earthwork test Instrument fields.
Background technique
Main study subject of the soil body as geotechnical engineering, material parameter are the bases of geotechnical study, the soil body
It destroys usually based on failure by shear, accordingly, it is determined that soil classifiction index --- cohesion (c) and internal friction angle (φ)
It is particularly important.Currently, wherein strain controlling formula staight scissors try there are many kinds of the test methods of determining soil classifiction index
It tests and is widely used so that its test principle is simple, test is easy to operate, testing expenses are cheap.
But easily occur soil sample eccentric compression phenomenon, soil sample eccentric compression during traditional strain controlling formula direct shear test
Resistance to shear of soil is caused to be unevenly distributed, generation tiltedly cuts phenomenon, and then pressure at right angle bar is caused to share the shearing force of soil sample, so leading to
Often appear in pressure at right angle it is larger when the shearing peak value situation bigger than normal tested, influence the accurate of direct shear test test result
Property.
Why soil sample there is eccentric compression, and reason is mainly that Instrument structure defect causes.Shear box in direct shear test
It connect with steel loop, is sheared by the deformation test of steel loop, lower shear box is pushed to carry out direct shear test, apparatus structure such as Fig. 1 institute
Show.
It as seen from Figure 1, is that upper shear box is motionless on surface in direct shear test, lower shear box movement.But actually due to
Steel loop stress self-deformation causes shear box that can also generate displacement, therefore pressure at right angle bar and upper shear box along shearing direction
Relative displacement occurs, so that pressure cover is deflected centered on pressure at right angle bar, and then cause soil sample eccentric compression (such as following figure institute
Show).This allow for steel loop test shearing wherein some be that pressure at right angle bar is shared, influence the accurate of direct shear test
Property.When pressure at right angle is smaller, the smaller steel loop deformation of shearing peak value is small, influence it is smaller, but pressure at right angle greatly to a certain extent
When, the influence of relative displacement is with regard to obvious.
Utility model content
The purpose of the utility model is to overcome the defects of traditional strain controlling formula direct shear test instrument soil sample eccentric compression, improve
Accuracy, the reasonability of strain controlling formula direct shear test.
To achieve the above object, the utility model uses following technical proposals:
Anti- soil sample eccentric compression strain controlling formula direct shear test instrument comprising shear box, pressure at right angle bringing device, level
Pressure applying means, instrumentation table and instrument pedestal,
Shear box is made of upper shear box and lower shear box, and upper shear box has main body in the cylindrical shape of a upper and lower opening,
Lower shear box has a cylinder-shaped lower main body, and main body is docked up and down with the lower main body of cylindrical shape in cylindrical shape collectively forms for containing
The soil body container with upward opening of the soil body；
The restricted upper shear box of instrument platform seat tool shear box edge along the position limiting structure that horizontal thrust direction is moved and under limiting
The horizontal thrust direction track mobile in pedestal surfaces；
Pressure at right angle applying portion includes press perpendicular lever, counterweight, press perpendicular frame, pressure rod and pressure transmission lid, is hung down
Straight pressing lever is set to instrument pedestal bottom, and press perpendicular lever one end hangs with counterweight, press perpendicular lever and press perpendicular
Frame direct or indirect connection, pressure rod are fixedly connected on press perpendicular lever, and pressure transmission lid is placed in cylindrical shape in main body simultaneously
It is smooth in soil body surface；
Horizontal pressure force bringing device includes the pusher being placed on instrument pedestal and is set to pusher and lower shear box
Steel loop between on the outside of box body pushes lower shear box along tracks travel, thrust direction and track when pusher is pushed by external force
Direction is consistent；
Instrumentation table includes the dial gauge for measuring steel loop deformation values, and dial gauge is fixed on inside steel loop.
Lower shear box bottom is equipped with idler wheel, and idler wheel is rolled in the track of instrument pedestal surfaces.
Press perpendicular lever first end hangs counterweight, and second end is articulated with a steel bar for being fixed on instrument pedestal bottom, vertically
Pressing lever is close to the position of second end by bolted splice in the bottom of press perpendicular frame.
Pressure rod, which is spirally connected, to be fixed in the screwed hole of centre at the top of increased pressure frame.
Pressure transmission tops center is equipped with the groove for carrying pressure rod bottom.
The instrument pedestal limits upper shear box and is fixed on instrument platform along the position limiting structure that horizontal thrust direction is moved for one
The baffle of seating face and the groove at the top of baffle；Upper shear box is equipped with the protrusion being adapted to the groove.
The lower shear box is with outter box except main body under cylindrical shape, is being between main body under outter box and cylindrical shape
Annular groove.
The anti-soil sample eccentric compression strain controlling formula direct shear test instrument of the utility model, steel loop is changed and is docked with lower shear box
Test shearing is fixed by controlling upper shear box with instrument pedestal relative position, and with pressure rod phase does not occur for shear box in guarantee
To displacement, and then prevent occurring the phenomenon that soil sample eccentric compression during direct shear test.The direct shear apparatus mainly has vertical pressure
Power applying portion, soil sample contain, shear part, push, dynamometry part, main part.The direct shear apparatus on fixing by shearing
Box, pushes lower shear box, surveys the mode of shearing in lower shear box, shear box does not occur with pressure rod during the test in guarantee
Relative displacement, and then prevent soil sample eccentric compression.
Detailed description of the invention
Now in conjunction with Figure of description, the technical solution of the utility model is further described.
Fig. 1 tradition strain controlling formula direct shear test instrument schematic diagram.
Fig. 2 is anti-soil sample eccentric compression strain controlling formula direct shear test instrument overall structure side view.
Fig. 3 is anti-soil sample eccentric compression strain controlling formula direct shear test instrument overall structure plan view.
Fig. 4 is steel loop plan view.
Fig. 5 is steel loop vertically center axial section.
Fig. 6 is lower shear box plan view.
Fig. 7 is lower shear box vertically center axial section.
Fig. 8 is upper shear box plan view.
Fig. 9 is upper shear box vertically center axial section.
Figure 10 is instrument pedestal plan view.
Figure 11 is instrument pedestal vertically center axial section.
Figure 12 is pressing lever, press perpendicular frame, the connection schematic diagram between pressure rod.
Wherein:
Pusher 101, displacement meter 102, press perpendicular frame 103, pressure transmission lid 104, sample 105, shear box 106, dynamometry
Meter 107, dynamometry dial gauge 108.
Pusher 201, steel loop 202, dial gauge 203, lower shear box 204, the lower main body 204.1 of cylindrical shape, annular groove
204.2, pressure rod 205, press perpendicular frame 206, pressure transmission lid 207, soil sample 208, upper shear box 209, protrusion 209.1, cylinder
Main body 209.2 in shape, baffle 210, groove 210.1, instrument pedestal 211, track 211.1, press perpendicular lever 212, counterweight
213, steel bar 214.
Specific embodiment:
Below it is only the implementation example of the utility model, the scope of the utility model cannot be limited with this.I.e. in every case according to this
The variation of unsubstantiality made by utility model application the scope of the patents and modification, should still belong to the range that the utility model patent covers
It is interior.
The anti-soil sample eccentric compression strain controlling formula direct shear test instrument of the utility model, overall construction such as Fig. 2~Fig. 3 institute
Show, main member is as represented in figures 4 to 11.
As shown in Fig. 2, the anti-soil sample eccentric compression strain controlling formula direct shear apparatus of the utility model, basic structure includes cutting
Cut box, pressure at right angle bringing device, horizontal pressure force bringing device, instrumentation table and instrument pedestal.
Shear box constitutes as shown in Fig. 7~8 by upper shear box 209 and lower shear box 204, and upper shear box 209 has one
Main body 209.2 in the cylindrical shape of upper and lower opening, the rear of main body 209.2 extends rearwardly to form a plate in cylindrical shape, plate
In the groove 210.1 for the baffle 210 that bottom is used to be embedded in instrument pedestal with strip bulge 209.1, the protrusion, guarantee
The position of upper shear box is fixed along thrust direction in shear history, and relative displacement will not occur between pressure rod.
Lower shear box 204 has one to be connected to main body 204.1 under the tubular in shear box cylindrical shape below main body, cylinder-shaped
Upper main body 209.2 docks the soil with upward opening collectively formed for containing the soil body with lower about 204.1 main body of cylindrical shape
Body container.Lower shear box 204 is with outter box except main body under cylindrical shape, is being ring between main body under outter box and cylindrical shape
Connected in star 204.2.Lower boxshear apparatus bottom is equipped with idler wheel, and idler wheel is rolled in the track of instrument pedestal surfaces.
The baffle 210 on 211 surface of instrument pedestal, which can be used, to be welded and fixed or other machinery mode is fixedly connected on instrument
Pedestal.The surface of instrument pedestal 211, which has, limits the track that lower shear box is moved horizontally along pedestal surfaces, the direction of the track with
The thrust direction that lower shear box is subject to is consistent.
Pressure at right angle applying portion includes press perpendicular lever 212, counterweight 213, press perpendicular frame 216, pressure rod 215
And pressure transmission lid 217.Press perpendicular lever 212 is set to instrument pedestal bottom, and press perpendicular lever first end hangs with counterweight, vertically
Pressing lever second end is articulated with the lower part of steel bar 214, and the top of steel bar 214 is fixed by bolts in instrument pedestal bottom, hangs down
Straight pressing lever is close to the position of second end by bolted splice in the bottom of press perpendicular frame 206.Increase in counterweight quantity
When, press perpendicular lever 212 can be rotated because weight is increased by code pressure around steel bar 214, while be driven under the straight increased pressure frame 206 of weight
Drop.
Pressure rod 205 itself has screw thread, and 206 upper middle position of press perpendicular frame has a hole, can be screwed into pressurization
Bar, so that pressure rod and press perpendicular frame are fixed together.Pressure rod by vertical direction power when, pressure at right angle can be passed
To the pressure transmission caping for being located at its bottom.Pressure transmission lid is socketed in cylindrical shape main body inner wall and smooth in soil body surface, pressure transmission caping
Portion center is equipped with groove, for bearing pressure transmission bar bring load and delivering load to soil sample.
Horizontal pressure force bringing device includes the pusher 201 being placed on instrument pedestal 211 and is set to pusher 201
With the steel loop 202 between lower shear box box body outer box, when pusher is pushed by external force, shear box is sliding along track under Level Promoting
Row, thrust are main to consistent with orbital direction；Instrumentation table includes the dial gauge for measuring steel loop deformation values, and dial gauge is fixed on steel
Inside ring.
It is to be placed between lower shear box and pusher for the steel loop of dynamometry during test, actual shearing deformation need to subtract
Remove the deflection of steel loop.
Steps are as follows for specific assembly embodiment:
1, first upper shear box and lower shear box are butted against and fixed, then soil sample are placed in shear box to and are put into pressure transmission lid,
The shear box for having contained soil sample is placed in on fluted and steel ball instrument table top.
2, pressure transmission bar is placed in press perpendicular frame, the counterweight of corresponding weight is hung over into vertical add further according to test requirements document
Lever is pressed, press perpendicular part is adjusted, so that pressure rod is vertically pressed in pressure transmission and cover.
3, dial gauge is fixed in steel loop, places steel loop between shear box and pusher, adjusting pusher makes steel loop
It is just contacted with lower shear box, then percentage meter reading is zeroed.
4, pusher is rotated, shearing test is started, records related data.
5, after the completion of shearing, pusher is retracted, counterweight is removed, remove press rods, take out soil sample, complete test.
Fig. 2 is the anti-soil sample eccentric compression strain controlling formula direct shear test instrument after filling sample.
Claims (7)
1. anti-soil sample eccentric compression strain controlling formula direct shear test instrument, it is characterised in that: apply dress including shear box, pressure at right angle
It sets, horizontal pressure force bringing device, instrumentation table and instrument pedestal,
Shear box is made of upper shear box and lower shear box, upper shear box have a upper and lower opening cylindrical shape on main body, under cut
Box is cut with a cylinder-shaped lower main body, the upper main body of cylindrical shape with it is cylinder-shaped under dock above and below main body and collectively form for containing the soil body
The soil body container with upward opening；
Shear box edge is horizontal along the position limiting structure that horizontal thrust direction is moved and under limiting for the restricted upper shear box of instrument platform seat tool
The thrust direction track mobile in pedestal surfaces；
Pressure at right angle applying portion includes press perpendicular lever, counterweight, press perpendicular frame, pressure rod and pressure transmission lid, is vertically added
Pressure lever is set to instrument pedestal bottom, and press perpendicular lever one end hangs with counterweight, press perpendicular lever and press perpendicular frame
Direct or indirect connection, pressure rod are fixedly connected on press perpendicular lever, and pressure transmission lid is placed in main body and smooth in cylindrical shape
In soil body surface；
Horizontal pressure force bringing device includes the pusher being placed on instrument pedestal and is set to pusher and lower shear box box body
Steel loop between outside pushes lower shear box along tracks travel, thrust direction and orbital direction when pusher is pushed by external force
Unanimously；
Instrumentation table includes the dial gauge for measuring steel loop deformation values, and dial gauge is fixed on inside steel loop.
2. anti-soil sample eccentric compression strain controlling formula direct shear test instrument according to claim 1, it is characterised in that: lower shearing
Cassette bottom portion is equipped with idler wheel, and idler wheel is rolled in the track of instrument pedestal surfaces.
3. anti-soil sample eccentric compression strain controlling formula direct shear test instrument according to claim 1, it is characterised in that: vertical to add
Lever first end is pressed to hang counterweight, second end is articulated with a steel bar for being fixed on instrument pedestal bottom, and press perpendicular lever is close to the
The position at two ends is by bolted splice in the bottom of press perpendicular frame.
4. anti-soil sample eccentric compression strain controlling formula direct shear test instrument according to claim 1, it is characterised in that: pressure rod
It is spirally connected and is fixed in the screwed hole of centre at the top of increased pressure frame.
5. anti-soil sample eccentric compression strain controlling formula direct shear test instrument according to claim 1, it is characterised in that: pressure transmission lid
Top center is equipped with the groove for carrying pressure rod bottom.
6. anti-soil sample eccentric compression strain controlling formula direct shear test instrument according to claim 1, it is characterised in that: the instrument
Device pedestal limit upper shear box along the position limiting structure that horizontal thrust direction is moved be a baffle for being fixed on instrument pedestal surfaces and
Groove at the top of baffle；Upper shear box is equipped with the protrusion being adapted to the groove.
7. anti-soil sample eccentric compression strain controlling formula direct shear test instrument according to claim 1, it is characterised in that: under described
Shear box is with outter box except main body under cylindrical shape, is being annular groove between main body under outter box and cylindrical shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820331187.7U CN208621434U (en) | 2018-03-09 | 2018-03-09 | Anti- soil sample eccentric compression strain controlling formula direct shear test instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820331187.7U CN208621434U (en) | 2018-03-09 | 2018-03-09 | Anti- soil sample eccentric compression strain controlling formula direct shear test instrument |
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| Publication Number | Publication Date |
|---|---|
| CN208621434U true CN208621434U (en) | 2019-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344646A (en) * | 2018-03-09 | 2018-07-31 | 中交四航工程研究院有限公司 | Anti- soil sample eccentric compression strain controlling formula direct shear test instrument |
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2018
- 2018-03-09 CN CN201820331187.7U patent/CN208621434U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344646A (en) * | 2018-03-09 | 2018-07-31 | 中交四航工程研究院有限公司 | Anti- soil sample eccentric compression strain controlling formula direct shear test instrument |
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