CN104236964B - Concrete axial is to tensile test specimen mould and the rod member built-in process that uses this mould - Google Patents

Concrete axial is to tensile test specimen mould and the rod member built-in process that uses this mould Download PDF

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Publication number
CN104236964B
CN104236964B CN201310228479.XA CN201310228479A CN104236964B CN 104236964 B CN104236964 B CN 104236964B CN 201310228479 A CN201310228479 A CN 201310228479A CN 104236964 B CN104236964 B CN 104236964B
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end panel
test specimen
mould
hole
plate
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CN104236964A (en
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姜福香
王玉田
赵铁军
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Qingdao Li Zheng Construction Technology Co., Ltd.
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Qingdao University of Technology
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Abstract

The present invention relates to a kind of test mould, particularly relate to a kind of dumbbell shape mould for Concrete Under Uniaxial Tension test and the built-in process of a kind of rod member.The concrete axial of the present invention is to tensile test specimen mould, including a base plate, the both sides that base plate is relative are respectively fixedly connected with side plate, the other both sides that base plate is relative are provided with end panel, base plate, side plate and end panel are combined into the box body of top end opening inner hollow, the side that biside plate is relative forms boss in intermediate projections respectively, each side plate be respectively provided on two sides with the jack protruding from end panel plane, biside plate just to jack between connect horizon bar, the centre of horizon bar is provided with through hole I, vertical rod is plugged on base plate in the fixing hole arranged after through hole, end panel passes through horizon bar, vertical rod is spacing, through hole II it is respectively equipped with in each end panel, grafting built-in fitting in through hole II.It is high that test specimen makes precision, makes test specimen flow process succinct.

Description

Concrete axial is to tensile test specimen mould and the rod member built-in process that uses this mould
Technical field
The present invention relates to a kind of test mould, particularly relate to a kind of dumbbell for Concrete Under Uniaxial Tension test Mould and the built-in process of a kind of rod member.
Background technology
Axis pulling experiment is most basic test method, it is possible to record the axial tensile strength of concrete directly and accurately, also It it is the method obtaining single shaft tension stress-strain curve unique feasible.Studying various concrete pull resistances Can in the test of parameter and various material members fracture property and mechanism, axis pulling experiment have important theory and Practical significance.In recent years, mechanical load is with under environmental factors compound action, and the durability of xoncrete structure is ground Studying carefully and obtained increasing attention, single shaft draws, the durability research of xoncrete structure can under action of compressive stress With the directly reaction stress level impact on structural life-time.
But, require higher, axle tension to be difficult in test the charger due to axis pulling experiment and Controlling, the most still do not have ideal test method, the uniaxial tension test of concrete is typically by indirectly Tension test or obtained by the empirical formulas with comprcssive strength, and resistance under existing complex factors effect Journal of Sex Research is also many for a long time replaces axial tension with bending tensile.But some researcher is thought, concrete directly resists There is not direct relation between tensile strength, tensile splitting strength and comprcssive strength, only test specimen is directly executed Add the tensile strength values that xial feed records and be only the real tensile strength of concrete, and owing to bending tensile is deposited Stress gradient, its on concrete durability impact also different from simple axial tension.
In concrete axis pulling experiment, can " axle draws " effect that reach satisfied be the key of test success or failure.Test In, in addition to taking effective safeguard measure to be improved, between the shape of test specimen, size, testing machine Method of clamping and the precision of making, difficulty or ease and success or failure to axis pulling experiment play a key role.
Through retrieval, it is currently used for the test specimen of axis pulling experiment, is broadly divided into following a few class: (1) adhesive type tries Part；(2) external clamping test specimen；(3) reserved cellular type test specimen；(4) built-in fitting formula test specimen.Wherein, built-in fitting Formula test specimen is applied more in axis pulling experiment.Pre-buried pull bar class is the axis pulling experiment component of a kind of standard, and test is drawn Power is delivered in concrete sample by being embedded in the reinforcing pull rod at test specimen two ends.Pre-buried pull bar quantity typically uses One, but in order to ensure there is between pull bar and concrete enough cohesive forces, it is possible to many of pre-buried symmetry are drawn Bar.
The pre-buried position of pull bar and perpendicularity determine the precision of direct axis pulling experiment to a great extent, and solve Certainly method and the key of this problem is that on the mould making test specimen.Currently, it is used for making built-in fitting formula Concrete axial draws the mould kind of test specimen seldom, and axle draws effect poor；The location of the most pre-buried rod member is pre-buried Program is complicated, and perpendicularity is difficult to ensure that.
Summary of the invention
The technique effect of the present invention can overcome drawbacks described above, it is provided that a kind of concrete axial to tensile test specimen mould, Its pre-buried rod member vertical efficiency technique good, pre-buried is simple, and can be directly produced out dumbbell shape tensile test specimen.
For achieving the above object, the present invention adopts the following technical scheme that it includes a base plate, and base plate is relative Both sides be respectively fixedly connected with side plate, the other both sides that base plate is relative are provided with end panel, base plate, side plate and end Portion's plate is combined into the box body of top end opening inner hollow, and the side that biside plate is relative is formed in intermediate projections respectively Boss, each side plate be respectively provided on two sides with the jack protruding from end panel plane, biside plate just to jack Between connect horizon bar, the centre of horizon bar is provided with through hole I, and vertical rod is through being plugged on base plate after through hole In the fixing hole arranged, end panel is spacing by horizon bar, vertical rod, each end panel is respectively equipped with logical Hole II, grafting built-in fitting in through hole II.
The horizon bar of the present invention, vertical rod and stopping means can quickly, accurately ensure mould assembly precision, Ensure that position and the perpendicularity of built-in fitting.The test specimen of this Mold Making is dumbbell shape, and test specimen uses camber line mistake The end expanding type (dumbbell shape) of degree, on the one hand, the stress level at test specimen both ends can be reduced, it is ensured that fracture Occur in homogeneous state of stress section (middle uiform section section).Horizontal dumbbell shape (only horizontal plane one direction expand) with The dumbbell shape of two-way expansion is compared, and test specimen is regular, makes relatively easy, and test specimen uses horizontal direction to pour, Being easy to pour and vibrate, quality is prone to ensure.
Can be in the case of other parts be constant, by changing the length of pleural apophysis part (boss), from And the length of thickness portion such as change in the middle part of test specimen, to adapt to the different tests requirement to sample dimensions.
The centre of boss is plane, and both sides are arc, rounding off between plane and arc, and STRESS VARIATION is equal Even, it is to avoid changeover portion stress is concentrated and destroyed.
Being respectively equipped with four through holes II in each end panel, on the plate of both ends, the through hole II of correspondence is just to setting, Four through holes II in each end panel are positioned on four summits of same rectangle.It is to say, it is same Four through holes II arranged in end panel are axle pair relative to the horizontal axis of the test specimen in mould and longitudinal central axis Claiming, plate relative through hole II in both ends is just to arranging (being i.e. positioned on same level line), it is ensured that mould is produced The exact position of the built-in fitting in test specimen, it is enough that the end of expansion is that four screw thread members pre-buried provides Space, it is ensured that its minimum spacing meets the needs of concrete cast.
Built-in fitting include screw rod, screw rod after running through through hole II by being arranged on the nut II of the end panel left and right sides Spacing.
Screw rod is provided with pad, and the left and right sides of pad is spacing by nut I, and the diameter of pad is more than nut The diameter of I, it is therefore intended that during axis pulling experiment, provides enough cohesive forces to pre-buried rod member, it is ensured that bar Part is buried underground firmly in concrete, is unlikely to extract.
It is provided with downward opening blind hole in boss, alleviates side plate deadweight.
Base plate is provided with groove, and the lower end of end panel is inserted in groove.
The left and right sides of side plate is provided with the chuck of depression, and end panel is stuck in chuck, the edge of side plate and end The outerplanar of plate is equal.
It is a further object to provide a kind of rod member built-in process using above-mentioned mould, including as follows Step:
(1) installing fastening mould, pre-buried screw rod fixes a pad by two nuts I, screw rod passes through Reach through hole II, by being fixed in end panel II screw rod of both sides nut of stubborn fastening end plate；
(2) cast concrete material, vibration compacting；
(3) treat that test specimen pours complete, preliminary maintenance, end panel outboard nut II is removed, can normally remove End panel.
The diameter of step (1) Intermediate gasket is more than the diameter of nut I.
The outboard nut II unloaded is reusable.
The present invention's it is a technical advantage that:
(1) horizontal dumbbell shape test specimen is regular, makes relatively easy, and test specimen uses horizontal direction to pour, it is simple to Pouring and vibrate, quality is prone to ensure.
(2) mold structure is simple, easy to process.Whole mould is fastened by several nuts and screw thread member, Assembling, convenient disassembly, can be effectively improved test efficiency.
(3) the pre-buried technology of rod member proposed, operability is good, convenient and swift, the most effectively.
(4) test specimen makes precision height.Side plate and the setting of bottom plate groove, it is ensured that the precision that mould assembles； The setting of end plate boring, it is ensured that the position of pre-buried rod member and perpendicularity.Common guarantee axle draws the height of test specimen Required precision.
(5) the good suitability.Different tests can be met to examination by adjusting the length of pleural apophysis part The requirement of part size.
(6) test specimen flow process is made succinct.The processing of whole test specimen substantially divides three steps to complete, the first step: Fasten mould, and the screw rod by fastening both sides nut, end being fixed with nut and pad is fixed on end plate On；Second step: cast concrete material, vibration compacting；3rd step: preliminary maintenance, removes pre embedded bolt Nut outside upper head plate, form removal.
Accompanying drawing explanation
Fig. 1 is the perspective view of the present invention；
Fig. 2 is the use state schematic top plan view of the present invention；
Fig. 3 is the side view of the present invention；
Fig. 4 is the side plate schematic diagram of the present invention；
Fig. 5 be in Fig. 4 A-A to sectional view；
Fig. 6 be in Fig. 4 B-B to sectional view；
Fig. 7 be in Fig. 4 C-C to sectional view；
Fig. 8 is base plate schematic diagram of the present invention.
In figure: 1-side plate；2-end panel；3-base plate；4-horizon bar；5-vertical rod；6-jack；7-is recessed Groove；8-chuck；9-through hole I；10-blind hole；11-boss；12-fixing hole；13-through hole II；14-is pre-buried Part；
141-screw rod；142-nut I；143-pad；144-nut II.
Detailed description of the invention
The concrete axial of the present invention is to tensile test specimen mould, and including a base plate 3, the both sides that base plate 3 is relative are divided Not fixing connecting lateral plate 1, the other both sides that base plate 3 is relative are provided with end panel 2, base plate 3, side plate 1 and end Portion's plate 2 is combined into the box body of top end opening inner hollow, and the relative side of biside plate is respectively in intermediate projections shape Become boss 11, each side plate 1 be respectively provided on two sides with the jack 6 protruding from end panel 2 plane, biside plate Just to jack between connect horizon bar 4, the centre of horizon bar is provided with through hole I 9, and vertical rod 5 is through through hole After be plugged on base plate in the fixing hole 12 arranged, end panel 2 is spacing by horizon bar 4, vertical rod 5, Through hole II 13 it is respectively equipped with, grafting built-in fitting 14 in through hole II 13 in each end panel 2.
The centre of boss 11 is plane, and both sides are arc, rounding off between plane and arc.
Four through holes II 13 it are respectively equipped with in each end panel 2.
Built-in fitting 14 include screw rod 141, screw rod 141 after running through through hole II 13 by being arranged on about end panel The nut II 144 of both sides is spacing.
Screw rod 141 is provided with pad 143, and the left and right sides of pad 143 is spacing by nut I 142, pad The diameter of 143 is more than the diameter of nut I 142.
Downward opening blind hole 10 it is provided with in boss 11.
Base plate 3 is provided with groove 7, and the lower end of end panel 2 is inserted in groove 7.
The left and right sides of side plate 1 is provided with the chuck 8 of depression, and end panel 2 is stuck in chuck 8, the limit of side plate 1 Edge is equal with the outerplanar of end panel 2.
Use the rod member built-in process of this mould, comprise the steps:
(1) fastening mould is installed, pre-buried screw rod 141 fixes a pad by two nuts I 142 143, screw rod 141 runs through through hole II 13, by II 144 screw rods of both sides nut to stubborn fastening end plate 2 141 are fixed in end panel 2；
(2) cast concrete material, vibration compacting；
(3) treat that test specimen pours complete, preliminary maintenance, end panel 2 outboard nut II 144 is removed, Ji Kezheng Often remove end panel.
The diameter of step 1 Intermediate gasket 143 is more than the diameter of nut I 142.

Claims (10)

1. concrete axial is to a tensile test specimen mould, and including a base plate (3), the both sides that base plate (3) is relative are fixed respectively Connecting lateral plate (1), it is characterised in that the other both sides that base plate (3) is relative are provided with end panel (2), base plate (3), side Plate (1) and end panel (2) are combined into the box body of top end opening inner hollow, and the relative side of biside plate is respectively in intermediate projections Formed boss (11), each side plate (1) be respectively provided on two sides with the jack (6) protruding from end panel (2) plane, both sides Plate just to jack between connect horizon bar (4), the centre of horizon bar is provided with through hole I (9), vertical rod (5) pass through hole After be plugged on base plate in the fixing hole (12) arranged, end panel (2) is spacing by horizon bar (4), vertical rod (5), Through hole II (13), the interior grafting built-in fitting of through hole II (13) (14) it is respectively equipped with in each end panel (2).
Concrete axial the most according to claim 1 is to tensile test specimen mould, it is characterised in that the centre of boss (11) is Plane, both sides are arc, rounding off between plane and arc.
Concrete axial the most according to claim 1 and 2 is to tensile test specimen mould, it is characterised in that each end panel (2) Upper four through holes II (13) that are correspondingly provided with respectively, the upper corresponding through hole II (13) of both ends plate (2) is just to setting, Mei Geduan Four through holes II (13) on portion's plate (2) are positioned on four summits of same rectangle.
Concrete axial the most according to claim 3 is to tensile test specimen mould, it is characterised in that built-in fitting (14) includes spiral shell Bar (141), screw rod (141) run through through hole II (13) after by be arranged on the end panel left and right sides nut II (144) limit Position.
Concrete axial the most according to claim 4 is to tensile test specimen mould, it is characterised in that screw rod (141) is provided with Pad (143), the left and right sides of pad (143) is spacing by nut I (142), and the diameter of pad (143) is more than spiral shell The diameter of female I (142).
Concrete axial the most according to claim 1 is to tensile test specimen mould, it is characterised in that boss is provided with out in (11) The blind hole (10) of mouth down.
Concrete axial the most according to claim 1 is to tensile test specimen mould, it is characterised in that base plate (3) is provided with recessed Groove (7), the lower end of end panel (2) is inserted in groove (7).
Concrete axial the most according to claim 1 is to tensile test specimen mould, it is characterised in that the left and right two of side plate (1) Side is provided with the chuck (8) of depression, and end panel (2) is stuck in chuck (8), the edge of side plate (1) and end panel (2) Outerplanar is equal.
9. the rod member built-in process of the mould used described in any of the above-described claim, it is characterised in that comprise the steps:
(1) fastening mould is installed, pre-buried screw rod (141) fixes a pad (143) by two nuts I (142), Screw rod (141) runs through through hole II (13), by the both sides nut II (144) of stubborn fastening end plate (2) screw rod (141) It is fixed in end panel (2)；
(2) cast concrete material, vibration compacting；
(3) treat that test specimen pours complete, preliminary maintenance, end panel (2) outboard nut II (144) is removed, can normally tear open Except end panel.
Rod member built-in process the most according to claim 9, it is characterised in that step (1) Intermediate gasket (143) straight Footpath is more than the diameter of nut I (142).
CN201310228479.XA 2013-06-08 2013-06-08 Concrete axial is to tensile test specimen mould and the rod member built-in process that uses this mould Active CN104236964B (en)

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