CN204461962U - The test unit of concrete joint water resistant permeance property under a kind of controlled lateral restriction effect - Google Patents
The test unit of concrete joint water resistant permeance property under a kind of controlled lateral restriction effect Download PDFInfo
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- CN204461962U CN204461962U CN201420754423.8U CN201420754423U CN204461962U CN 204461962 U CN204461962 U CN 204461962U CN 201420754423 U CN201420754423 U CN 201420754423U CN 204461962 U CN204461962 U CN 204461962U
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Abstract
The utility model discloses the test unit of concrete joint water resistant permeance property under a kind of controlled lateral restriction effect, for carrying out the test of water resistant permeance property to the test block of new-old concrete seam areas.There is the double-deck square tube 4 for placing the impervious test block of new-old concrete seam 5, the sealed bottom of square tube, the suitable for reading of square tube has outward flange 14, and square tube bottom is provided with the inward flange 9 with middle opening 10, and square tube 4 is divided into test block cabin 6 and water inlet cabin 13 two parts by inward flange; Test block cabin is provided with to be convenient to regulate the impervious test block 5 of clamping and the force adjustment hole 16 of crossing the double threaded screw 15 of both sides, test block cabin; Concrete impervious test block is fixed by top left cover plate 1 and right cover plate 2 and cover plate fastening bolt 3; Inward flange is provided with resilient seal packing ring 8; Left cover and being fixed on the outward flange of square tube by tightened bolt presses.The utility model can realize the water resistant permeance property test of new-old concrete seam areas under controlled lateral restriction effect.
Description
Technical field
The utility model relates to and a kind ofly there is test unit that is new, old concrete structure seam areas water resistant permeance property to causing owing to building interval.
Background technology
In architecture industry, there is the position of causing in xoncrete structure owing to building interval time and there is seam, as the concrete joint of basement and post-cast strip, the Metro Station Structure of the superimposed wall construction pattern of employing, the joint area of assembled underground structure, the concrete joint stubble position of underpass, the later stage of Other Engineering structure repair position etc.When these engineering structures are positioned at below phreatic line, in operation operational phase these seam areas seepage position of comparatively concentrating often, use the structure in later stage, concrete permanance etc. causes considerable influence, also can cause certain loss, engineering time serious, even can be caused to scrap.
Be difficult to ensure waterproof effect completely because the construction quality of water barrier in current underground works is subject to more multifactorial impact, therefore also some waterproof measures are proposed successively for improving of these new-old concrete seam areas anti-permeability performances, as patent 1 (publication number CN2801916Y, publication date 2006.08.02), patent 2 (publication number CN201908363U, publication date 2011.07.27), patent 3 (publication number CN202787526U, publication date 2013.03.13), patent 4 (publication number CN201110154743, publication date 2011.11.23) etc., by increasing the water proof structure pattern of seam, improve new-old concrete adhesive property, change the methods such as the shape of seam areas to strengthen its anti-permeability performance.But, at present for the test of concrete impermeability, mainly according to " GB/T50082-2009 Standard for test methods of longterm performance and durability of ordinary concrete standard " (implementation date: on July 1st, 2010,6th chapter water resistant permeability test) the round table-like concrete test block (up-small and down-big) that adopts disposable integral to build tests its anti-permeability performance, do not relate to anti-permeability performance test method and the device of new-old concrete seam areas, cannot test to the effect of the waterproof measure at this kind of position.Some other disclosed document, as patent 5 (publication number CN102608014A, publication date 2012.07.25), patent 6 (publication number CN101806702B, publication date 2011.04.27), patent 6 (publication number CN201120371533, publication date 2012.05.23) etc., also be detect for the overall anti-permeability performance of concrete test block, do not relate to the impervious detection at the xoncrete structure position that there is seam.
Document disclosed in the people such as Xu Hongfa (" research of concrete joint impermeability test method ", " Sichuan University's journal (engineering science version) ", 42nd volume the 4th phase, 7-12 page, in July, 2010), propose a kind of utilize existing concrete anti-leakage detector for water improve after concrete joint impermeability test method.In the method, the impervious test block of concrete joint of circular platform type adopts the mode of building for 2 times to make, concrete joint form considers trapezoidal and arc two kinds, uses conventional concrete impervious instrument (as described in " GB/T50082-2009 Standard for test methods of longterm performance and durability of ordinary concrete standard ") to add water from the bottom of concrete test block afterwards and compresses into row impermeability test.Adopting the subject matter existed in this way is: to be ejected by hydraulic pressure for preventing concrete test block and come off, steel bushing on concrete impervious instrument is circular platform type (up-small and down-big), therefore in the concrete impervious test block of installation and add from bottom Hydraulic Process and can make to form a hoop effect of contraction between concrete impervious test block and steel bushing, increase new, extruding force between old concrete and this extruding force can not directly control (being mainly subject to the impact loading hydraulic pressure), cause seam in various degree closed, and the impermeability of seam areas under actual working state can not be reflected, and when there is pre-tension in the seam areas of some engineering structures (as prefabricated construction joint area may adopt that screwed joint is reinforced, position, post-cast strip concrete often has bulging force effect), this test method effectively or cannot control the pre-add force value of seam areas in impermeability test process, also cannot the actual working state of reflect structure.
Observation in practice of construction and research shows, carry out, to the test of concrete joint water resistant permeance property under controlled lateral restriction effect, there is strong necessity, such as, in some underground structures, as basement, underpass, subway station, immersed tube tunnel etc., for the cracking risk that reduction xoncrete structure self-constriction and non-uniform settling cause, need to arrange post-cast strip or expansion reinforcing band in the structure.Disclosed in Ji Weiqiang, (Basement Concrete Structures expansion reinforcing band substitutes the Construction Technique of post-cast strip to document, " Jiangxi building materials ", 4th phase in 2012, 57-58 page), (the immersed tube post-cast strip expansive concrete operating technique of document disclosed in the people such as Zhao Penghui, " operating technique ", 43rd volume supplementary issue, 136-138 page, in June, 2014) in the basement expansion reinforcing band carried, the new-old concrete seam areas such as immersed tube tunnel post-cast strip, adopt and build with certain expansile concrete, the extruding force utilizing expansive concrete to produce goes to the crack and the space that compensate this position concrete shrinkage generation.At the position of this type of xoncrete structure, expansive concrete due to position, post-cast strip is in the situation that border, both sides limits relatively, the bulging force that newly-laid concrete produces makes the new-old concrete joint face at post-cast strip place be subject to certain squeezing action, to improve its impervious effect.Test the impermeability at this type of position, current existing concrete impervious instrument cannot fit the extruding force of control action in new-old concrete seam areas at impervious test block patrix, therefore cannot reasonably evaluate the actual impermeability at this type of position.
Utility model content
In view of the above deficiency of prior art, the purpose of this utility model is to provide a kind of test unit xoncrete structure seam areas being carried out to water resistant permeance property under controlled lateral restriction effect, eliminate the hoop effect of contraction of concrete impervious instrument steel bushing to concrete test block, also can adjust and control the pre-add lateral restriction of new-old concrete seam areas, can test the water resistant permeance property of new-old concrete seam areas under closer to the condition of actual working environment, design and construction for such engineering structure provides foundation more accurately, reduce the seepage of appearance operation stage in later stage.
For realizing utility model object, technical solution adopted in the utility model is:
A test unit for concrete joint water resistant permeance property under controlled lateral restriction effect, for carrying out the test of water resistant permeance property to the test block of new-old concrete seam areas.Have for placing the double-deck square tube 4 of the impervious test block of new-old concrete seam 5, the sealed bottom of square tube, the suitable for reading of square tube has outward flange 14, and square tube bottom is provided with the inward flange 9 with middle opening 10, and square tube is divided into test block cabin 6 and water inlet cabin 13 two parts by inward flange; Test block cabin is provided with to be convenient to regulate the impervious test block 5 of clamping and the force adjustment hole 16 of crossing the double threaded screw 15 of both sides, test block cabin; Concrete impervious test block is fixed by top left cover plate 1 and right cover plate 2 and cover plate fastening bolt 3; Inward flange is provided with resilient seal packing ring 8; Left cover and right cover plate are fixed on the outward flange of square tube by tightened bolt presses; The water inlet cabin of square tube bottom connects hydraulic devices 11 and water inlet, and connects water pressure gauge 12; Be provided with the observation panel being convenient to observe infiltration situation according to the shape of concrete joint and region between left cover and right cover plate.
Left cover 1 and right cover plate 2 also can form a monoblock type cover plate, and it offers viewport according to the shape of concrete joint and region correspondence.
Adopting the experimental provision of said structure, having in the two-part double-deck square tube 4 in test block cabin 6 and water inlet cabin 13 the impervious test block 5 be made up of novel concrete and old concrete being fitted through double threaded screw 15 and clamping, hydraulic pressure being applied to new-old concrete seam 7; Inside dimensions and the concrete impervious test block of square tube adapt, with square tube sidewall in Elimination test process on the impact of the lateral restriction of concrete test block surrounding; In the direction of vertical concrete joint face, the via hole be convenient to by double threaded screw 15 is reserved in the centre of the impervious test block 5 be made up of novel concrete and old concrete; Concrete impervious test block is fixed through fastening bolt 3 by top left cover plate 1 and right cover plate 2, regulated the controlled pre-tension of the new-old concrete seam 7 of impervious test block 5 by double threaded screw 15, and make the resilient seal packing ring 8 bottom concrete impervious test block to form in crimp sealing restriction water inlet cabin 13 press water by the pressuring action of left cover 1 and right cover plate 2 to flow out from side bottom test block; The press water in water inlet cabin is pressed into impervious test block seam areas in test block cabin by middle opening 10; Water inlet cabin 13 place of square tube bottom connects hydraulic devices 11 and water inlet, and connects water pressure gauge; Experimenter observes infiltration situation by the observation panel on cover plate, stops test when infiltration appears in seam areas at top, the maximum hydraulic pressure value in record process of the test.
During specific experiment, by impervious for new-old concrete test block, (general size is 15cm × 15cm × 15cm, but be not limited thereto) be positioned over one with it size adapt in the double-deck square tube upper space of (slightly larger than test block size), inside square tube upper strata, prior brushing lubricant is to eliminate the constraint of side to test block, the prefabricated hole at concrete impervious test block center, square groove sidewall has been opened the hole being convenient to mounting stud, adopt and insert the fastening mode of stud bolt applies vertical joint face external force to concrete impervious test block, realize the controlled pre-tension effect acting on concrete joint position.Cover plate is divided into two pieces, left and right, all uses fastening bolt and square tube top outer rim compact siro spinning technology with fixing test block.In the direction of vertical concrete joint face, the via hole be convenient to by double threaded screw is reserved in the centre of the test block be made up of novel concrete and old concrete.During installation, in new, old concrete, reserved hole point-blank aligns; Stud bolt is through the hole of concrete test block inside, and pad is installed at two, concrete test block clamps by nut; The size adjusting and control side direction effect of contraction power in concrete impervious test block seam is realized by modes such as dial torque wrenches.Two cover plates stitching portion reserves a fixed gap and opening along concrete joint position, for observing permeability test result; Square tube lower floor is water inlet cabin, connects hydraulic pressure feedway and water pressure gauge; Open square orifice between the levels of square tube, make to act on concrete joint position into the water in water cabin by this position; For anti-sealing flows out from side bottom test block, one deck certain thickness silicone rubber kinds resilient seal packing ring (between size with the inner levels of square tube, inward flange shape conforms to) is set with square tube contact site bottom concrete impervious test block, by the fastening effect of top cover, concrete test block tight compression packing washer is formed and close water ring, ensure that infiltration site of action at concrete seam and does not flow out from side bottom test block.The controlled pre-add lateral restriction of the new-old concrete seam of impervious test block is regulated by double threaded screw.
When the multiple concrete impervious test block of needs is tested simultaneously, can be in parallel by multiple same apparatus, adopt identical hydraulic pressure feedway to supply water, to keep same hydraulic pressure and action time.
The water resistant permeance property adopting the utility model can be conveniently implemented in new-old concrete seam areas under controlled lateral restriction effect detects.
Note: the utility model is subject to the subsidy of state natural sciences fund youth fund project (bullets 51108385), state natural sciences fund general project (bullets 51178401), expresses thanks at this.
Accompanying drawing explanation
Fig. 1 is the vertical view (nut at stud bolt not shown in FIG. and two and pad) of the test unit of the utility model controlled lateral restriction concrete joint water resistant permeance property.
Fig. 2 is the left view of Fig. 1.
Fig. 3 is the A-A sectional drawing of Fig. 2.
In figure: 1. left cover, 2. right cover plate, 3. fastening bolt, 4. square tube, the impervious test block of 5 new-old concrete, 6. test block cabin, 7. new-old concrete seam interface, 8. resilient seal packing ring, 9. inward flange, 10. inward flange middle opening, 11. water inlets and hydraulic devices, 12. water pressure gauges, 13. water inlet cabins, 14. outward flanges, 15. stud bolts, 16. force adjustment holes.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the utility model is further illustrated.
Embodiment
As shown in Figure 1-Figure 3, embodiment of the present utility model is, adopt the utility model apparatus and method, at concrete impervious test block center prefabricated hole, on square tube sidewall, opened hole, adopt and insert the fastening mode of stud bolt applies vertical joint face lateral restriction to concrete impervious test block, realize the controlled lateral restriction effect acting on concrete joint position, implementation step is as follows:
(1) make old, the impervious test block 5 of novel concrete and new-old concrete seam interface 7 is processed, to build in the concrete process of test block position in the central portion and insert a pvc pipe (external diameter is slightly larger than the external diameter of stud bolt 15), pvc pipe is extracted out when concrete reaches demoulding strength, form a reserved straight hole, run through the impervious test block of new-old concrete;
(2) test unit described in technical solutions of the utility model is connected hydraulic devices 11 and water pressure gauge 12, and install resilient seal packing ring 8, in water inlet cabin, bottom 13, fill water;
(3) impervious for concrete joint test block is loaded in the test unit square tube 4 described in technical solutions of the utility model (square tube inwall brushing lubricant), the via hole of concrete test block central authorities is alignd with the force adjustment hole 16 of square tube sidewall, and stud bolt 15 is inserted the hole of concrete test block central authorities;
(4) cover cover plate 1,2 and tighten cover plate fastening bolt 3;
(5) tentatively tighten stud bolt 15, tighten the nut of stud bolt 15 subsequently with dial torque wrench, to apply certain pre-add lateral restriction;
(6) applied to permeate hydraulic pressure by hydraulic devices 11, the water resistant permeance property of test concrete seam, stop test when infiltration appears in seam areas at top, the maximum hydraulic pressure value in record process of the test.
Adopt the experiment equipment and progress of this example, surperficial dabbing is taken and the process of painted concrete interfacial agents to new-old concrete seam interface 7, be applied with different pre-tension sidewise restraint concrete joint interfaces afterwards, the test findings of the impervious test block of different pre-tension Under Concrete seam is as shown in the table.
| Sequence number | Seam interface processing mode | Pre-add force value (Nm) | Infiltration hydraulic pressure/MPa |
| 1 | Surface dabbing brushing interfacial agents | 0 | 0.50 |
| 2 | Surface dabbing brushing interfacial agents | 30 | 0.60 |
| 3 | Surface dabbing brushing interfacial agents | 60 | 0.65 |
| 4 | Surface dabbing brushing interfacial agents | 90 | 0.80 |
From table, result is known, adopt pre-tension in various degree or measure to carry out sidewise restraint to concrete joint position and can produce certain impact to its anti-permeability performance, the impermeability of the new-old concrete seam crossing under different side force constraint condition can be tested out by technical solutions of the utility model.
Claims (2)
1. the test unit of concrete joint water resistant permeance property under a controlled lateral restriction effect, for carrying out the test of water resistant permeance property to the test block of new-old concrete seam areas, it is characterized in that, there is the double-deck square tube (4) for placing the impervious test block of new-old concrete seam (5), the sealed bottom of square tube, the suitable for reading of square tube has outward flange (14), square tube bottom is provided with the inward flange (9) with middle opening (10), and square tube is divided into test block cabin (6) and water inlet cabin (13) two parts by inward flange; Test block cabin is provided with to be convenient to regulate the impervious test block of clamping (5) and the force adjustment hole (16) of crossing the double threaded screw (15) of both sides, test block cabin; Concrete impervious test block is fixed by top left cover plate (1) and right cover plate (2) and cover plate fastening bolt (3); Inward flange is provided with resilient seal packing ring (8); Left cover and right cover plate are fixed on the outward flange of square tube by tightened bolt presses; The water inlet cabin of square tube bottom connects hydraulic devices (11) and water inlet, and connects water pressure gauge (12); Be provided with the observation panel being convenient to observe infiltration situation according to the shape of concrete joint and region between left cover and right cover plate.
2. the test unit of concrete joint water resistant permeance property under controlled lateral restriction effect according to claim 1, it is characterized in that, left cover (1) and right cover plate (2) form a monoblock type cover plate, and it offers observation panel according to the shape of concrete joint and region correspondence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420754423.8U CN204461962U (en) | 2014-12-04 | 2014-12-04 | The test unit of concrete joint water resistant permeance property under a kind of controlled lateral restriction effect |
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| CN201420754423.8U CN204461962U (en) | 2014-12-04 | 2014-12-04 | The test unit of concrete joint water resistant permeance property under a kind of controlled lateral restriction effect |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458532A (en) * | 2014-12-04 | 2015-03-25 | 西南交通大学 | Device and method for testing water permeability resistance of concrete joint under action of controllable lateral restriction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458532A (en) * | 2014-12-04 | 2015-03-25 | 西南交通大学 | Device and method for testing water permeability resistance of concrete joint under action of controllable lateral restriction |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150708 Termination date: 20191204 |
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| CF01 | Termination of patent right due to non-payment of annual fee |