CN205981942U - Bridge deck pavement layer and decking interlaminar shear resistance rigidity testing arrangement - Google Patents

Abstract

The utility model discloses a bridge deck pavement layer and decking interlaminar shear resistance rigidity testing arrangement, including components such as top board, well clamp plate, holding down plates, the hole that 4 structure sizes, pitch -row equal all has on top board, well clamp plate, the holding down plate, the holding down plate level is placed, and 4 bolts penetrate from bottom to top and push down in the diaphragm orifice, testing the test piece with cement concrete and placeeing on the holding down plate, the cement concrete decking contacts with the holding down plate, well clamp plate, push down the tight cement concrete of plate holder test test piece, pressure sensor, flat jack central point put the collineation and install center department on well clamp plate, hole and 4 bolt cooperations of top board, the top board compresses tightly flat jack, 4 individual first nut mounting height fastens at the top of bolt equally, compresses tightly the top board, well clamp plate, top board clamping pressure sensor, flat jack, through controlling the size that flat jack was exerted pressure, can realize testing the shear stiffness under the different normal pressure condition, embodied the utility model discloses a commonality and having embodied the utility model discloses an accuracy nature.

Description

Bridge deck pavement and floorings shearing strength at intersection device for testing stiffness

Technical field

This utility model belongs to road and bridge technical field of buildings, is related to a kind of bridge deck pavement and floorings shearing strength at intersection rigidity Test device；It is particularly well-suited to cementing pump vehicle bridge deck pavement and floorings shearing strength at intersection rigidity test.

Background technology

Deck paving is the important component part of bridge superstructure, and as the protective layer of bridge structure, deck paving is protected Shield carriageway plate, from the direct abrasion of traffic load, prevents floorings from suffering from rain erosion；As stress layer, deck paving pair The load of vehicle wheel weight plays certain distribution effect, and this load is passed to bridge superstructure.

The Bridge Surface Paving by Cement structural form that China commonly uses at present is concrete pavement layer+water-proof tack coat + asphalt concrete pavement layer；It is not close contact completely between concrete pavement layer and floorings, repeating vehicle Under the effect such as load, thermal gradient and contraction, there is slip relatively in interlayer, or even failure by shear occurs, its interlayer connects Tactile state directly affects the degree that deck paving participates in main beam stress.For the detection of Mid and minor spans concrete-bridge, If can not be when carrying out main beam stress state analysiss, the assurance contact status between layers of quantitation, accurately consider deck paving Impact, can lead to there is larger difference between the girder mechanical characteristic tested and calculated value, so that bridge state Assessment result is not accurate enough.Therefore, learn that Cement Concrete Deck Paving Course and the contact status between layers of floorings just seem outstanding For important.?《Consider the composite beam Finite-Element Solution of shearing slip effect》In one literary composition, this contact status between layers are defined by author For the relation of bridge deck pavement and floorings interlaminar shear and relative slip, i.e. shearing strength at intersection rigidity.

There is no the test instrunment dedicated for bridge structure pave-load layer and floorings shearing strength at intersection rigidity, rock at present both at home and abroad Though geotechnological journey aspect has soil instrument, its soil test specimen compares bridge deck pavement and floorings shearing strength at intersection rigidity test test specimen chi Very little too small, and large-tonnage shearing cannot be applied, therefore be difficult to be generalized to the shearing strength at intersection rigidity test of bridge deck pavement and floorings. It is therefore proposed that a kind of bridge deck pavement that test is convenient, precision is higher and floorings shearing strength at intersection stiffness test method just seem Very urgent.

Content of the invention

The utility model discloses a kind of bridge deck pavement and floorings shearing strength at intersection device for testing stiffness, existing to solve Test instrunment no dedicated for bridge structure pave-load layer and floorings shearing strength at intersection rigidity in technology, though Geotechnical Engineering aspect has Soil instrument, but its soil test specimen to compare bridge deck pavement too small with floorings shearing strength at intersection rigidity test sample dimensions, and cannot The problems such as apply large-tonnage shearing, therefore be difficult to be generalized to the shearing strength at intersection rigidity test of bridge deck pavement and floorings.

This utility model cementing pump vehicle bridge deck pavement is included with floorings shearing strength at intersection device for testing stiffness：Bag Include top board, center platen, lower platen, flat jack, pressure transducer, 4 bolts, the first nut, the second nut, the 3rd spiral shells Cap；The hole that physical dimension is identical, pitch-row is equal is had on top board, center platen, lower platen；Lower platen horizontal positioned, 4 bolts Penetrate from bottom to top in the hole of lower platen；Wipe cement concrete test coupon level with acetone and place upper surface, horizontal positioned Lower surface；Cement concrete test test specimen is seated on lower platen, cement concrete bridge deck plate is contacted with lower platen；Middle pressure The hole of plate and 4 bolt cooperations, 4 the second nuts are fastened on bolt, compress center platen；Center platen, push board clamping cement Concrete test test specimen；Pressure transducer, flat jack center are collinearly arranged on the center on center platen；Top board Hole and the cooperation of 4 bolts, top board compresses flat jack；4 the first nut setting height(from bottom)s are equally fastened on bolt Top, compresses top board；Center platen, top board clamping pressure sensor, flat jack；Cement concrete test test specimen is vertical During placement, this utility model device not landing.

This utility model also includes 4 the first nuts, 4 the second nuts, 4 the 3rd nuts；4 the 3rd nuts install height Degree is equally fastened on the middle part of bolt, is arranged on below center platen；4 the second nut setting height(from bottom)s are equally fastened on bolt Middle part, be arranged on above center platen；4 the first nut setting height(from bottom)s are equally fastened on the top of bolt, are arranged on pressure Above plate.

The size of Cement Concrete Deck Paving Course and floorings shearing strength at intersection rigidity test test specimen be 15cm × 15cm × 55cm.

This utility model device applies normal pressure to cement concrete test test specimen：

The relation such as following formula of wheel load P ' under normal pressure P and practical situation：

P=2P ' (a+15) (b+15)/825

In formula：P ' axletree weight, a wheel is along the length that lands (cm) of direction of traffic, the width (cm) of b wheel.

The beneficial effects of the utility model are：Apply stressed size by controlling flat jack, can achieve to difference Shear stiffness in the case of normal pressure is tested, and embodies the versatility of the present invention；Invention provides for shear stiffness test The size of test specimen, if sample dimensions are too small, cannot simulate the actual state of bridge structure；If sample dimensions are excessive, Lead to in-house operation difficult；Embody the standardization of the present invention；Vertical load is converted into regulation model by forcing press by the present invention Enclose larger and simulate accurate shearing, embody the accuracy of the present invention.

Brief description

Fig. 1 is that Cement Concrete Deck Paving Course of the present invention tests test specimen schematic diagram with floorings shear stiffness；

Fig. 2 is upper, middle and lower of the present invention pressing plate floor map；

Fig. 3 is normal pressure analog subsystem schematic diagram of the present invention；

Fig. 4 is the inventive method principle schematic；

Fig. 5 is displacement cloud atlas under shearing action for the FEM (finite element) model；

Fig. 6 is shearing and relative floor displacement test relation curve and finite element analyses relation curve comparison diagram；

In figure：1 cement concrete bridge deck plate, Bridge 2 face pave-load layer, 3 connect reinforcing bars, 4 top boards, 5 center platens, 6 lower platens, 7 bolts, 8 first nuts, 9 second nuts, 10 the 3rd nuts, 11 flat jack, 12 pressure transducers, 13 upper padding plates, under 14 Backing plate, 15 extensometers, 16 dial gauges, 17 forcing presses, 18 holes；A cement concrete test coupon level places upper surface, B cement Concrete test coupon level places lower surface, C cement concrete tests the upper surface after test specimen is vertically placed, D coagulating cement Lower surface after the vertical placement of soil test test specimen, E cement concrete test the center of test specimen bridge deck pavement side.

Specific embodiment

Describe an embodiment of the present utility model below in conjunction with accompanying drawing in detail.

This utility model embodiment, cementing pump vehicle bridge deck pavement and floorings shearing strength at intersection device for testing stiffness Shown in Fig. 2, Fig. 3, including top board 4, center platen 5, lower platen 6, flat jack 11,12,4 bolts 7 of pressure transducer, One nut 8, the second nut 9, the 3rd nut 10；Have on top board 4, center platen 5, lower platen 6 that physical dimension is identical, pitch-row phase Deng hole 19；Lower platen 6 horizontal positioned, 4 bolts 7 penetrate in the hole 19 of lower platen 6 from bottom to top；Wipe cement with acetone to mix The solidifying soil test upper and lower surface of test specimen；Cement concrete test test specimen is seated on lower platen 6, cement concrete bridge deck plate 1 with Lower platen 6 contacts；The hole 19 of center platen 5 is coordinated with 4 bolts 7, and 4 the second nuts 9 are fastened on bolt 7, presses in compression Plate 5；Center platen 5, lower platen 6 clamping cement concrete test test specimen；Pressure transducer 12, flat jack 11 center are altogether Line is arranged on the center on center platen 5；The hole 19 of top board 4 is coordinated with 4 bolts 7, and top board 4 compresses flat jack 11；4 the first nut 8 setting height(from bottom)s are equally fastened on the top of bolt 7, compress top board 4；Center platen 5, top board 4 press from both sides Press force transducer 12, flat jack 11；When cement concrete test test specimen is vertically placed, this utility model is not fall off.

Process of the test is as follows：

The first step, Cement Concrete Deck Paving Course is made with floorings shearing strength at intersection rigidity test test specimen：

As shown in figure 1, cement concrete test test specimen includes cement concrete bridge deck plate 1, connects reinforcing bar 3 and deck paving Layer 2；A size of 15cm × 15cm × 55cm；

Cement Concrete Deck Paving Course is included with floorings shearing strength at intersection rigidity test test specimen making step：

Operation one, pours lower floor's cement concrete：One layer of high cement concrete of 7.5cm, shape is poured in test mould Become cement concrete bridge deck plate 1；

Operation two, the lower floor's cement concrete surface after pouring arranges connection reinforcing bar 3 immediately；And it is real according to bridge structure Border situation carries out plucking；The ratio of reinforcement=the area of reinforcement/(piece lengths × specimen width)；This utility model adopted test specimen arrangement of reinforcement Rate is 0.2%；

Operation three, to lower floor's cement concrete health preserving 7 days；

Operation four, pours the high upper layer concrete of 7.5cm, forms bridge deck pavement 2；

Operation five, continues health preserving 28 days again to integral cement concrete test test specimen；

Operation six, cement concrete test coupon level is placed, and is put cement concrete test coupon level using sand paper Put upper surface A, horizontal positioned lower surface B polishing smooth；

Second step, by clamping for cement concrete test coupon level on this utility model：

As shown in Figure 1, Figure 2, Figure 3 shows, normal pressure analog subsystem include top board 4, center platen 5, lower platen 6, flat thousand Jin top 11,12,4 bolts 7 of pressure transducer, the first nut 8, the second nut 9, the 3rd nut 10；Top board 4, center platen 5, 4 holes 18 that physical dimension is identical, pitch-row is equal are respectively provided with lower platen 6；Lower platen 6 horizontal positioned, 4 bolts 7 from lower and On penetrate in the hole 18 of lower platen 6；Cement concrete test test specimen is seated on lower platen 6, cement concrete bridge deck plate 1 with Lower platen 6 contacts；The hole 18 of center platen 5 is coordinated with 4 bolts 7, and 4 the second nuts 9 are fastened on bolt 7, presses in compression Plate 5；Center platen 5, lower platen 6 clamping cement concrete test test specimen；Pressure transducer 12, flat jack 11 center are altogether Line is arranged on the center on center platen 5；The hole 18 of top board 4 is coordinated with 4 bolts 7, and top board 4 compresses flat jack 11；4 the first nut 8 setting height(from bottom)s are equally fastened on the top of bolt 7, compress top board 4；Center platen 5, top board 4 press from both sides Press force transducer 12, flat jack 11；When cement concrete test test specimen is vertically placed, normal pressure analog subsystem will not Landing；

3rd step, cement concrete test test specimen is vertically placed：

As shown in figure 4, vertically placing cement concrete test test specimen, using sand paper, cement concrete test test specimen is erected Upper surface C, the lower surface D after vertical storing after disposed upright is put polish and smooth；Wiped with acetone；Test test specimen in cement concrete Upper surface C upper horizontal after bridge deck pavement 2 is vertically put places upper padding plate 13, tests test specimen floorings in cement concrete Lower surface D lower horizontal after 1 vertical storing places lower bolster 14；

4th step, installs extensometer 15 and dial gauge：

As shown in figure 4, smoothing the center position sand papering of test specimen bridge deck pavement 2 side, wiped with acetone； Extensometer 15 is clamped at polishing position, the horizontal range between measurement 15 two arm of forces of extensometer is simultaneously recorded as L₀；In examination The first dial gauge 16 is put so as to there is initial reading and recording, note at part bridge deck pavement 2 and the contact position of upper padding plate 13 For w₀；Put the second dial gauge 17 so as to there is initial reading and recording in test specimen bridge deck pavement 2 lower surface, be designated as w₀′.

5th step, applies normal pressure with this utility model to cement concrete test test specimen：

As shown in figure 3,4 the 3rd nut 10 setting height(from bottom)s of this utility model are equally fastened on the middle part of bolt 7, install Below center platen 5；4 the second nut 9 setting height(from bottom)s are equally fastened on the middle part of bolt 7, are arranged on above center platen 5；4 Individual first nut 8 setting height(from bottom) is equally fastened on the top of bolt 7, is arranged on above top board 4；

Adjust different size of wheel load under flat jack 11 simulating actual conditions and apply positive pressure to setting value；Twist Tight first nut 8, the second nut 9 and the 3rd nut 10, accurately read positive pressure value by pressure transducer 12 and are recorded as P； The relation such as following formula of wheel load P ' under normal pressure P and practical situation in this utility model method：

P=2P ' (a+15) (b+15)/825

In formula：P ' axletree weight, a wheel is along the length that lands (cm) of direction of traffic, the width (cm) of b wheel.

6th step, simulation shearing test：

As shown in figure 4, forcing press 18 applies simulation shearing action in upper padding plate 13 upper surface；The differences such as forcing press 18 (10KN) it is stepped up simulating shearing until test specimen occurs failure by shear；

Record the first dial gauge 16 reading w under per moment shearing corresponds to₁, the second dial gauge 17 reading w₁', extensometer 15 Reading Δ L；Then under this shearing action, bridge deck pavement 2 and floorings 1 relative floor displacement are：

ε=w- Δ L/L₀×L；

In formula：W=Δ w- Δ w ', Δ w=w₁-w₀, Δ w '=w₁′-w₀', L piece lengths.

Because the copulation state between laminates of test specimen are not to be in close contact completely, under shearing action, test specimen does not almost lift Play phenomenon, some scholars are also referred to as tearing effect；The breakoff phenomenon observed in test similarly can illustrate this point.I.e. Test method of the present utility model can be ignored interface and start effect, can accurately record the shearing of faying face Energy.

7th step, makes shearing and relative floor displacement relation curve：

Repeat test procedure six, record three groups of experimental datas, as shown in table 1；

Table 1 test data

Make the relation curve of shearing and relative floor displacement in the case of normal pressure P (the present embodiment P=0), as Fig. 6 institute Show；

It will be appreciated from fig. 6 that under the effect of the present embodiment normal pressure P=0, when shearing is more than 10kN, relative storey displacement is with shearing Increase and increase.Shearing and relative storey displacement relation curve are analyzed understanding, shearing increases and relative storey displacement keeps constant Belong to shearing and overcome interlayer frictional resistance (Q₀, for connecting the failure by shear resistance that reinforcing bar 3 provides, μ is friction for=c+ μ P, wherein c Coefficient, P be normal pressure) process.And after working as the frictional resistance that shearing can provide more than faying face, frictional resistance no longer works, So increase relative storey displacement with shearing assumes the phenomenon that approximately linear increases.

Because test test specimen is compared with actual bridge structure, it is small-sized, so using average on test specimen faying face Shear stress (shearing/faying face area, i.e. τ-τ₀=(Q-Q₀)/A) discussing faying face shear stiffness.Adopt in shear stiffness Shear stress for actual test to shearing deduct frictional resistance and overcome part shearing (the i.e. Q-Q falling₀).Then deck paving 2 with Floorings 1 shearing strength at intersection rigidity k meets following formula：

τ-τ₀=(Q-Q₀)/A=k ε

In formula：The shearing that Q actual test arrives, Q₀Interlayer frictional resistance, ε relative floor displacement, A Coating combination face Area.

The shear stiffness that three groups of experimental datas are obtained is averaged, you can obtain the effect of the present embodiment normal pressure P=0 Under, bridge deck pavement 2 and floorings 1 shearing strength at intersection rigidity are 425kpa/mm.

8th step, sets up the FEM (finite element) model of cementing pump vehicle structural test piece：

As shown in figure 5, set up the FEM (finite element) model of bridge structure test specimen using ANSYS software, applied by numerical simulation Different shear loads, obtain the displacement cloud atlas under different shear loads correspond to, you can obtain concrete-bridge bridge deck pavement 2 Finite-Element Solution with floorings 1 shearing strength at intersection rigidity；

As shown in fig. 6, relatively the test value of method of testing described in the utility model and the relation curve of Finite-Element Solution understand, Test value curve is preferable with the degree of agreement of Finite-Element Solution curve, you can concrete bridge beam bridge floor described in the utility model is described Pave-load layer 2 is preferable with FInite Element degree of agreement with floorings 1 shearing strength at intersection stiffness test method.

9th step, changes the normal pressure size that flat jack 11 applies, and repeats experimental procedure six, step 7, you can survey Cementing pump vehicle bridge deck pavement 2 and floorings 1 shearing strength at intersection rigidity in the case of the different normal pressure of examination.

Tenth step, closing presure machine 18 and flat jack 11, concrete-bridge bridge deck pavement 2 and floorings 1 interlayer Shear stiffness test job completes.

Claims (4)

1. a kind of bridge deck pavement and floorings shearing strength at intersection device for testing stiffness；It is characterized in that：Including top board, middle pressure Plate, lower platen, flat jack, pressure transducer, 4 bolts, 4 the first nuts, 4 the second nuts and 4 the 3rd nuts； 4 holes that physical dimension is identical, pitch-row is equal are respectively provided with top board, center platen, lower platen；Lower platen horizontal positioned, 4 spiral shells Bolt penetrates in the hole of lower platen from bottom to top；Cement concrete test test specimen is seated on lower platen, cement concrete bridge deck Plate is contacted with lower platen；The hole of center platen and the cooperation of 4 bolts, center platen, push board clamping cement concrete test test specimen； Pressure transducer, flat jack center are collinearly arranged on the center on center platen；The hole of top board is joined with 4 bolts Close, top board compresses flat jack；4 the first nut setting height(from bottom)s are equally fastened on the top of bolt, compress top board； Center platen, top board clamping pressure sensor, flat jack.

2. bridge deck pavement according to claim 1 and floorings shearing strength at intersection device for testing stiffness；It is characterized in that, also Including 4 the first nuts, 4 the second nuts, 4 the 3rd nuts；4 the 3rd nut setting height(from bottom)s are equally fastened on bolt Middle part, is arranged on below center platen；4 the second nut setting height(from bottom)s are equally fastened on the middle part of bolt, are arranged on center platen Top；4 the first nut setting height(from bottom)s are equally fastened on the top of bolt, are arranged on above top board.

3. bridge deck pavement according to claim 1 and floorings shearing strength at intersection device for testing stiffness；It is characterized in that：Water Cement concrete bridge deck pavement is 15cm × 15cm × 55cm with the size of floorings shearing strength at intersection rigidity test test specimen.

4. bridge deck pavement according to claim 1 and floorings shearing strength at intersection device for testing stiffness；It is characterized in that：This Utility model device applies normal pressure to cement concrete test test specimen：

The relation such as following formula of wheel load P ' under normal pressure P and practical situation：

P=2P ' (a+15) (b+15)/825

In formula：P ' axletree weight, a wheel is along the length that lands (cm) of direction of traffic, the width (cm) of b wheel.