CN116840143A - Device and method for pushing out test of corrugated steel pipe reinforced concrete column by considering secondary load - Google Patents
Device and method for pushing out test of corrugated steel pipe reinforced concrete column by considering secondary load Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 91
- 239000010959 steel Substances 0.000 title claims abstract description 91
- 238000012360 testing method Methods 0.000 title claims abstract description 34
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000004567 concrete Substances 0.000 claims abstract description 51
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000006073 displacement reaction Methods 0.000 claims abstract description 19
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000013016 damping Methods 0.000 claims description 23
- 239000000463 material Substances 0.000 claims description 12
- 230000002787 reinforcement Effects 0.000 claims description 11
- 210000001503 joint Anatomy 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000003032 molecular docking Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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Abstract
The application provides a device and a method for pushing out a reinforced concrete column of a corrugated steel pipe reinforced by taking secondary load into consideration, belongs to the technical field of building structure tests, and aims to solve the problem that the conventional pushing out test device cannot compensate creep deformation of concrete in a load holding process during measurement, and the technical points are as follows: the hydraulic lifting device comprises a supporting column, hydraulic jacks are arranged on the left side and the right side of the supporting column, a first base plate is fixedly connected to the upper side of the hydraulic jacks, a linear displacement sensor is arranged above the first base plate, and a corrugated steel pipe is arranged in the middle of the first base plate. According to the application, the device can measure the resistance strain gauge at the wave crest, the antinode and the wave trough of the corrugated steel pipe through the first strain flower, the second strain flower and the third strain flower which are arranged at the wave crest, the antinode and the wave trough of the corrugated steel pipe, and the device can compensate creep deformation of concrete in the load holding process through the spring during measurement, so that N is maintained 1 And (3) the bearing is unchanged, and then a secondary load is applied to maintain the stability of the pre-pressing axial force.
Description
Technical Field
The application relates to the technical field of building structure tests or tests, in particular to a device and a method for pushing out a reinforced concrete column reinforced by a corrugated steel pipe under consideration of secondary load.
Background
Damage such as cracks and oxidation on the surface of the pier column can directly affect the bonding performance between the pier column and the concrete. In addition, during the service life of the pier stud, due to various forces, tiny displacement or deformation may occur, which also affects the interface bonding performance, so that the pier stud needs to be subjected to slip measurement, and the existing slip measurement device has some defects in use.
For example, the device disclosed in publication No. CN110296933A can be used for measuring the free end slip value of the concrete filled steel tube column; the extension thread vertical rod is embedded in the steel tube concrete column in the manufacture of the component, and the extension cross rod is reliably connected with the extension thread vertical rod through a bolt, so that the bonding slip measurement value of the free end is stable and accurate enough; the design of the measuring device enables the steel tube concrete column to be connected with the extension cross rod, and the displacement of the free end can be measured by means of the displacement meter after the movable bolt is screwed down, so that the installation is easy, and the operation is convenient. The push-out test device can be conveniently installed when in use, but can not perform strain test on the wave crest, the antinode and the wave trough of the corrugated steel pipe when in use, has no secondary loading function, and can not compensate creep deformation of concrete in the load holding process when in measurement.
Disclosure of Invention
In view of the problems in the existing push-out test device: the conventional push-out test device cannot compensate creep deformation of concrete in the load holding process during measurement, and therefore, the application provides a push-out test device and a push-out test method for a reinforced concrete column of a corrugated steel pipe, which consider secondary load.
In order to solve the technical problems, the application provides the following technical scheme: the utility model provides a take into account ripple steel pipe reinforcement reinforced concrete post release test device of secondary load, includes the support column, the left and right sides of support column is provided with hydraulic jack, hydraulic jack's top fixedly connected with first backing plate, linear displacement sensor is installed to the top of first backing plate, the centre of first backing plate is provided with the ripple steel pipe, the inside of ripple steel pipe is provided with the concrete pier stud, the concrete pier stud passes through the spring and links to each other with the support column, the internally mounted of concrete pier stud has the electron slide gauge, the top of ripple steel pipe is connected with the second backing plate, the dial gauge is installed to the left and right sides of second backing plate, force sensor is installed to the top of second backing plate, force sensor's top is connected with the screw jack, the surface mounting of ripple steel pipe has first strain gauge, the below of first strain gauge is provided with the second strain gauge, the below of second strain gauge is provided with the third strain gauge.
As a preferential scheme of the application, the first backing plate is internally provided with a lattice structure, the hydraulic jacks are symmetrically distributed on the left side and the right side of the first backing plate, the surface of the first backing plate is provided with a driving assembly, the outer side of the top of the driving assembly is provided with a marking assembly, a pressing plate is arranged between the marking assembly and the driving assembly, the left side of the driving assembly is provided with an extension plate, and a fixing sleeve is fixedly connected above the extension plate.
As a preferential scheme of the application, the central axes of the corrugated steel pipe, the second backing plate and the screw jack are on the same straight line, and a gap exists between the corrugated steel pipe and the concrete pier.
As a preferential scheme of the application, the linear displacement sensor is a differential transformation displacement sensor, and the linear displacement sensors are symmetrically distributed on the left side and the right side of the first backing plate.
As a preferred embodiment of the present application, the first strain relief is located at a peak of the corrugated steel pipe, the second strain relief is located at an antinode of the corrugated steel pipe, and the third strain relief is located at a trough of the corrugated steel pipe.
As a preferential scheme of the application, the driving assembly comprises a rotary groove which is arranged at the top of a first backing plate, a movable rod is slidably arranged in the rotary groove, a motor is fixedly arranged at the left front side of the upper surface of the first backing plate, a connecting rod is fixedly connected to an output shaft of the motor, a gear is arranged on the outer side of the connecting rod in a fitting way, a toothed ring is connected to the outer side of the gear in a meshing way, the bottom of the toothed ring is connected with the movable rod, the left side of the toothed ring is connected with an extension plate, a connecting block is fixedly arranged around the connecting rod, a damping block is fixedly connected to the side surface of the connecting block, a butt joint groove is arranged on the upper surface of the gear, a connecting rod is fixedly connected with a pressing plate, and a through hole for the connecting rod to pass through is formed in the middle of the gear.
As a preferential scheme of the application, the damping blocks are hemispherical, the damping blocks are made of rubber, the outer walls of the lower half parts of the damping blocks are mutually attached to the inner walls of the butting grooves, the butting grooves are distributed on the surface of the gear at equal intervals, and the positions and the number of the butting grooves are in one-to-one correspondence with those of the damping blocks.
As a preferential scheme of the application, the fixed sleeve is made of high-hardness rubber, the top of the fixed sleeve is provided with the first air nozzle, the inside of the fixed sleeve is hollow, and the middle of the first air nozzle is provided with the cross slit.
As a preferential scheme of the application, the marking component comprises a fixed ring fixedly arranged at the top of the gear, a rubber sleeve is fixedly arranged at the top of the fixed ring, a second air tap is arranged on the surface of the rubber sleeve, and a pressing structure is formed between the pressing plate and the rubber sleeve through a connecting rod.
The push-out test method of the corrugated steel pipe reinforced concrete column considering the secondary load comprises the following steps:
s1: in order to realize the reinforcement of the reinforced concrete pier column in the holding state, a screw jack is adopted to apply a pre-pressing axial force N to the top of the concrete pier column 1 Meanwhile, a spring is arranged at the bottom of the pier column to compensate creep deformation of concrete in the loading process, so that the stability of the pre-pressing axial force is maintained, the creep effect is eliminated, and the pre-pressing axial force N is maintained 1 Unchanged;
s2: during reinforcement, the position of the screw jack is kept unchanged, and the corrugated steel pipe is buckled with the concreteThe periphery of the pier column is arranged on the first lattice-type backing plate and used as a pouring template for pouring grouting materials; during pushing out test, the four hydraulic jacks under the first backing plate synchronously apply load, and the secondary load force is N 2 ；
S3: the pushing-out acting force is measured through a force sensor, the relative sliding of the upper end part of a new interface and an old interface of the concrete pier is measured by adopting an electronic dial indicator, and the relative sliding of the middle part, the quarter point and the lower end part of the concrete pier is measured by adopting a built-in electronic sliding meter; the longitudinal strain and the transverse strain of the concrete and the longitudinal strain of the grouting material are measured by adopting a buried electronic slip meter, and the strain at the wave crest, the antinode and the wave trough of the corrugated steel pipe is measured by adopting a resistance type strain gauge: first, second and third strain-relief measurements;
s4: based on the test result, the failure mechanism of new and old interfaces of the reinforced concrete pier column reinforced by the corrugated steel pipe is revealed, a bonding sliding constitutive relation is established, and the influence of the existing damage of the concrete pier column and the interface treatment mode on the bonding performance of the interfaces is studied.
Compared with the prior art, the application has the beneficial effects that:
1. through the first strain flower, the second strain flower and the third strain flower which are arranged at the positions of the wave crest, the antinode and the wave trough of the corrugated steel pipe, when the device is used for pushing out a test, the resistance type strain gauge can be measured at the positions of the wave crest, the antinode and the wave trough of the corrugated steel pipe, and the defect that the conventional measuring device cannot perform strain test at the positions of the wave crest, the antinode and the wave trough of the corrugated steel pipe is overcome.
2. The four hydraulic jacks under the lattice type backing plate synchronously apply load, and the pushing-out acting force is measured through a force sensor; the relative sliding of the upper end part of the new and old interfaces of the pier column is measured by adopting an electronic dial indicator, and the relative sliding of the middle part, the quarter point and the lower end part of the pier column is measured by adopting a built-in electronic sliding meter; the longitudinal strain, the transverse strain and the longitudinal strain of grouting materials of the concrete are measured by adopting embedded strain gauges to reveal the damage mechanism of new and old interfaces of the reinforced concrete pier column reinforced by the corrugated steel pipe, and the creep action of the concrete can be eliminated by the arranged springs to keep N 1 Maintaining the stability of the pre-pressing axial force, and then applying N 2 (secondary charge)And (5) carrying).
3. Through gear and ring gear on the device for the device accessible connecting rod drive gear rotates, and when gear rotation resistance is too big, the damping piece all around of connecting rod can break away from the inside of butt joint groove and remove to in the butt joint groove of next department, thereby make the connecting rod at the inside slip of gear, and then the gear keeps fixed state, and then make the clamp plate can support the gum cover, make the marking fluid in the gum cover can spout, thereby realize marking function, when corrugated steel pipe takes place deformation, the removal resistance of fixed cover in corrugated steel pipe increases, make there is the rotational speed difference between gear and the connecting rod, then realize marking function, whether staff's accessible observes corrugated steel pipe's left front side has marking fluid, thereby judge that corrugated steel pipe is enough to warp, the device's functional has been promoted, the defect that current release test device can not be automatic marking when corrugated steel pipe is compressed when using has the excellent in use effect.
4. Through the inside hollow fixed cover that sets up for device accessible first air nozzle is adjusted fixed cover expansion's degree, thereby adjust the clearance of fixed cover after the inflation and ripple steel pipe, so that follow-up when the ripple steel pipe takes place deformation, make the rotation resistance of gear change, thereby make the device can mark work under the different deformation conditions, the adjustable degree of device has been promoted, the defect that current release test device can not be adjusted to the accuracy of accurate to ripple steel pipe deformation test when using as required has the advantage that adjustable degree is higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following detailed description will be given with reference to the accompanying drawings and detailed embodiments, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained from these drawings without inventive effort to a person of ordinary skill in the art. Wherein:
FIG. 1 is a schematic diagram of the entire structure of a device for pushing out a reinforced concrete column of a corrugated steel pipe reinforced concrete by taking secondary load into consideration (the position of slurry is between a concrete pier 5 and a corrugated steel pipe 7);
FIG. 2 is a schematic elevational view of the present application;
FIG. 3 is a schematic view of the structure of FIG. 1 at A;
FIG. 4 is a schematic view of the fitting structure of the corrugated steel pipe and the fixed sleeve of the application;
FIG. 5 is a schematic view of the structure at B in FIG. 4;
FIG. 6 is a schematic view of the structure of FIG. 4 at C;
FIG. 7 is a schematic view of the gear and connecting rod split construction of the present application;
FIG. 8 is a schematic view of the connecting rod and platen connection structure of the present application;
FIG. 9 is a schematic cross-sectional view of a damping mass of the present application.
Reference numerals: 1. a support column; 2. a hydraulic jack; 3. a first backing plate; 4. a spring; 5. a concrete pier column; 6. an electronic slip meter; 7. corrugated steel pipe; 8. a linear displacement sensor; 9. a second backing plate; 10. a dial gauge; 11. a force sensor; 12. a screw jack; 13. a first strain flower; 14. a second strain relief; 15. third strain flower; 16. a through hole; 17. cross slotting; 18. a drive assembly; 1801. a rotary groove; 1802. a movable rod; 1803. a motor; 1804. a connecting rod; 1805. a gear; 1806. a toothed ring; 1807. a joint block; 1808. a damping block; 1809. a butt joint groove; 19. an extension plate; 20. a fixed sleeve; 21. a first air tap; 22. a marking assembly; 2201. a fixing ring; 2202. a rubber sleeve; 2203. a second air tap; 23. and (5) pressing plates.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Next, the present application will be described in detail with reference to the drawings, wherein the sectional view of the device structure is not partially enlarged to general scale for the convenience of description, and the drawings are only examples, which should not limit the scope of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Examples
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
As shown in figures 1-9, the device for pushing out the reinforced concrete column of the corrugated steel pipe reinforcement taking secondary load into consideration comprises a support column 1, wherein hydraulic jacks 2 are arranged on the left side and the right side of the support column 1, a first base plate 3 is fixedly connected above the hydraulic jacks 2, a linear displacement sensor 8 is arranged above the first base plate 3, a corrugated steel pipe 7 is arranged in the middle of the first base plate 3, a concrete pier 5 is arranged in the corrugated steel pipe 7, the concrete pier 5 is connected with the support column 1 through a spring 4, an electronic slip meter 6 is arranged in the concrete pier 5, a second base plate 9 is connected at the top of the corrugated steel pipe 7, dial indicators 10 are arranged on the left side and the right side of the second base plate 9, the force sensor 11 is installed above the second backing plate 9, the screw jack 12 is connected above the force sensor 11, the first strain flower 13 is installed on the surface of the corrugated steel pipe 7, the second strain flower 14 is arranged below the first strain flower 13, the third strain flower 15 is arranged below the second strain flower 14, the first strain flower 13, the second strain flower 14 and the third strain flower 15 can carry out strain detection on the undulating section of the corrugated steel pipe 7, as shown in fig. 1, in order to realize reinforcement of the reinforced concrete pier 5 in a holding state, the screw jack 12 is adopted to apply pre-pressing axial force N to the top of the concrete pier 5 1 Meanwhile, a spring 4 is arranged at the bottom of the pier column to compensate creep deformation of concrete in the loading process, maintain stability of the pre-pressing axial force, eliminate the creep effect and maintain the pre-pressing axial force N 1 Is unchanged. During reinforcement, 12 positions of the screw jack are keptThe corrugated steel pipe 7 is buckled on the periphery of the concrete pier 5 in pairs, is arranged on the first backing plate 3 and is used as a pouring template for pouring grouting materials; in the pushing-out test, the four hydraulic jacks 2 under the first base plate 3 synchronously apply load, and the secondary load force is N 2 The method comprises the steps of carrying out a first treatment on the surface of the The pushing-out acting force is measured through a force sensor 11, the relative sliding of the upper end part of a new interface and an old interface of the concrete pier 5 is measured by an electronic dial indicator 10, and the relative sliding of the middle part, the quarter point and the lower end part of the concrete pier 5 is measured by a built-in electronic sliding meter 6; the longitudinal strain and the transverse strain of the concrete and the longitudinal strain of the grouting material are measured by adopting a buried electronic slip meter 6, and the strain at the wave crest, the antinode and the wave trough of the corrugated steel pipe 7 is measured by adopting a resistance type strain gauge: the first, second and third strain-relief 13, 14, 15 measurements; based on the test result, the failure mechanism of the corrugated steel pipe 7 for reinforcing the new and old interfaces of the reinforced concrete pier 5 is revealed, the bonding sliding constitutive relation is established, and the influence of the existing damage of the reinforced concrete pier 5 and the interface treatment mode on the interface bonding performance is studied.
In this example, the inside of first backing plate 3 is the lattice structure, hydraulic jack 2 symmetric distribution is in the left and right sides of first backing plate 3, the first backing plate 3 of lattice structure can guarantee holistic intensity, the follow-up synchronous load that can apply of symmetric distribution hydraulic jack 2, so that make the release test device can carry out the bonding capability test, the surface mounting of first backing plate 3 has drive assembly 18, the outside at drive assembly 18 top is provided with mark assembly 22, be provided with clamp plate 23 between mark assembly 22 and the drive assembly 18, the left side of drive assembly 18 is provided with extension board 19, the top fixedly connected with fixed cover 20 of extension board 19, mark assembly 22 makes the device can carry out the marking fluid automatically and spray the work when drive assembly 18's during operation, the time and the position that the ripple steel pipe 7 takes place deformation have been confirmed to the convenience of follow-up staff, the convenience when using have been promoted.
In this example, the central axis of ripple steel pipe 7, second backing plate 9 and screw jack 12 is on same straight line, guarantees the stability when the device uses, exists the space between ripple steel pipe 7 and the concrete pier 5, and the space between ripple steel pipe 7 and the concrete pier 5 is convenient follow-up to carry out the grout material and pour to carry out the release experiment, promoted the functionality of device.
In this example, the linear displacement sensor 8 is a differential transformer displacement sensor, the linear displacement sensors 8 are symmetrically distributed on the left and right sides of the first base plate 3, and the differential transformer displacement sensor can improve the displacement detection accuracy, so that the device can ensure the accuracy of the test when pushing out the test.
In this example, the first strain relief 13 is located at the crest of the corrugated steel pipe 7, the second strain relief 14 is located at the antinode of the corrugated steel pipe 7, the third strain relief 15 is located at the trough of the corrugated steel pipe 7, and the first strain relief 13, the second strain relief 14 and the third strain relief 15 are located at the crest, the antinode and the trough of the corrugated steel pipe 7 respectively, so that the device can perform high-precision strain testing on the corrugated steel pipe 7, and the test precision of the device is improved.
In this example, the drive assembly 18 includes the rotary chute 1801 that opens at first backing plate 3 top, the inside slidable mounting of rotary chute 1801 has movable rod 1802, be fixed connection between connecting rod 1804 and the clamp plate 23, the fixedly connected with connecting rod 1804 on the output shaft of motor 1803, the outside laminating of connecting rod 1804 is provided with gear 1805, the outside meshing of gear 1805 is connected with toothed ring 1806, the bottom of toothed ring 1806 links to each other with movable rod 1802, the left side of toothed ring 1806 links to each other with extension board 19, the fixed linking piece 1807 that is provided with all around of connecting rod 1804, the side fixedly connected with damping piece 1808 of linking piece 1807, the upper surface of gear 1805 has seted up butt joint groove 1809, be fixed connection between connecting rod 1804 and the clamp plate 23, the through-hole 16 that supplies connecting rod 1804 to pass is seted up in the centre of gear 1805, the device is at the during operation accessible motor 1803 drive connecting rod 1804 rotates, thereby utilize the frictional force between gear 1805 to drive gear 1805 rotates, can drive toothed ring 1806 when gear 1805 rotates, can drive toothed ring 1806 and extension board 1806 and can take place the rotation when the rotation of gear 1805, the extension board 1805 is rotated, the deformation can take place in order to continue the rotation when the extension board 1805 is in the time, the rotation of connecting rod 1805 is continued, can not take place, and the deformation is kept on the rotation when the rotation board is convenient.
In this example, the shape of the damping block 1808 is a hemisphere, the damping block 1808 is made of rubber, the outer wall of the lower half of the damping block 1808 is attached to the inner wall of the docking slot 1809, the damping block 1808 made of rubber enables the damping block 1808 on the device to move from one docking slot 1809 to the next docking slot 1809 under the extrusion action, so that the function of a flexible coupling is achieved, the docking slots 1809 are distributed on the surface of the gear 1805 at equal intervals, the positions and the number of the docking slots 1809 are in one-to-one correspondence with the positions and the number of the damping blocks 1808, when the gear 1805 stops rotating, the damping block 1808 moves along each docking slot 1809, rotation is stopped by the gear 1805, and then marking can be performed.
In this example, the fixed cover 20 is high hardness rubber material, and first air cock 21 is installed at the top of fixed cover 20, and the inside of fixed cover 20 is hollow form, and cross slot 17 has been seted up to the centre of first air cock 21, and follow-up accessible first air cock 21 is to the inside injection air of fixed cover 20 to increase the volume of fixed cover 20, make the device can adjust fixed cover 20 expansion degree, and then change the condition when triggering fixed cover 20 to stop rotating, promoted the adjustable degree of device.
In this example, the marking assembly 22 includes a fixed ring 2201 fixedly mounted on the top of the gear 1805, a rubber sleeve 2202 is fixedly arranged on the top of the fixed ring 2201, a second air tap 2203 is arranged on the surface of the rubber sleeve 2202, a pressing structure is formed between the pressing plate 23 and the rubber sleeve 2202 through a connecting rod 1804, and the pressing structure on the device enables the pressing plate 23 on the connecting rod 1804 to squeeze the rubber sleeve 2202 when the connecting rod 1804 slides, so that marking liquid in the rubber sleeve 2202 can be sprayed out, and an automatic marking function is realized.
The application relates to a device and a method for pushing out a reinforced concrete column reinforced by a corrugated steel pipe with secondary load considered, which are characterized in that firstly, as shown in fig. 1-3, reinforcement of the reinforced concrete pier 5 in a holding state is realized, and a screw jack 12 is adopted to apply a pre-pressing axial force N to the top of the concrete pier 5 1 Simultaneously, a spring 4 is arranged at the bottom of the pier column to compensate the creep of the concrete in the holding processDeformation, the concrete being compressed under the action of creep, the spring 4 acting to hold N 1 Unchanged, then apply N 2 (secondary load), maintaining the stability of the pre-pressing axial force, eliminating the creep effect and maintaining the pre-pressing axial force N 1 Is unchanged. During reinforcement, the position of the screw jack 12 is kept unchanged, the corrugated steel pipe 7 is buckled on the periphery of the concrete pier 5 in pairs and is placed on the first backing plate 3, and grouting materials are poured by taking the corrugated steel pipe as a pouring template; in the pushing-out test, the four hydraulic jacks 2 under the first base plate 3 synchronously apply load, and the secondary load force is N 2 The method comprises the steps of carrying out a first treatment on the surface of the The pushing-out acting force is measured through a force sensor 11, the relative sliding of the upper end part of a new interface and an old interface of the concrete pier 5 is measured by an electronic dial indicator 10, and the relative sliding of the middle part, the quarter point and the lower end part of the concrete pier 5 is measured by a built-in electronic sliding meter 6; the longitudinal strain and the transverse strain of the concrete and the longitudinal strain of the grouting material are measured by adopting a buried electronic slip meter 6, the embedded electronic slip meter is used for measuring the grouting amount and the slip of the existing structure, and the strain at the wave crest, the antinode and the wave trough of the corrugated steel pipe 7 adopts a resistance type strain gauge: the first, second and third strain-relief 13, 14, 15 measurements; based on the test result, the failure mechanism of the corrugated steel pipe 7 for reinforcing the new and old interfaces of the reinforced concrete pier 5 is revealed, the bonding sliding constitutive relation is established, and the influence of the existing damage of the reinforced concrete pier 5 and the interface treatment mode on the interface bonding performance is studied.
As shown in fig. 4-9, in the working process of the device, the connecting rod 1804 can be driven to rotate by the motor 1803, the connecting block 1807 at the outer side of the connecting rod 1804 and the lower surface of the damping block 1808 are propped against the inside of the butting groove 1809, so that the resistance between the connecting rod 1804 and the gear 1805 is large enough, the function of driving the gear 1805 to rotate is realized, the gear 1805 can drive the toothed ring 1806 to rotate when rotating, the toothed ring 1806 drives the extension plate 19 and the fixed sleeve 20 to rotate, when the corrugated steel pipe 7 is not deformed, the fixed sleeve 20 can smoothly rotate, when the corrugated steel pipe 7 is deformed, the rotating resistance of the fixed sleeve 20 is increased, the damping block 1808 can be moved from the butting groove 1809 to the butting groove 1809 at the next position, the connecting rod 1804 slides on the gear 1805, at this moment, the pressing plate 23 on the connecting rod 1804 can prop against the rubber sleeve 2202 on the fixed ring 2201, the marking liquid in the rubber sleeve 2202 can be automatically sprayed out, the function of automatic marking when the corrugated steel pipe 7 is deformed, and the subsequent staff can conveniently detect and observe. The device is accessible from the inside injection gas of first air cock 21 department to fixed cover 20 when using, and fixed cover 20 increases in volume for the device can be at the in-process of work, adjusts the required condition of trigger gear 1805 slip, and then makes the device can be as required to the accuracy of accuracy to corrugated steel pipe 7 deformation test adjust.
Although the application has been described hereinabove with reference to embodiments, various modifications thereof may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the features of the disclosed embodiments may be combined with each other in any manner as long as there is no structural conflict, and the exhaustive description of these combinations is not given in this specification merely for the sake of omitting the descriptions and saving resources. Therefore, it is intended that the application not be limited to the particular embodiment disclosed, but that the application will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. The utility model provides a ripple steel pipe reinforcement reinforced concrete column release test device of considering secondary load, includes support column (1), its characterized in that: the utility model discloses a concrete bridge support, including support column (1), hydraulic jack (2) are provided with the left and right sides of support column (1), the top fixedly connected with first backing plate (3) of hydraulic jack (2), linear displacement sensor (8) are installed to the top of first backing plate (3), the centre of first backing plate (3) is provided with ripple steel pipe (7), the inside of ripple steel pipe (7) is provided with concrete pier (5), concrete pier (5) link to each other with support column (1) through spring (4), the internally mounted of concrete pier (5) has electron slip meter (6), the top of ripple steel pipe (7) is connected with second backing plate (9), micrometer (10) are installed to the left and right sides of second backing plate (9), force transducer (11) are installed to the top of second backing plate (9), the top of force transducer (11) is connected with spiral jack (12), the surface mounting of ripple steel pipe (7) has first strain relief (13), the below of first strain relief (14) is provided with first strain relief (14).
2. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 1, wherein the device comprises the following components: the inside of first backing plate (3) is lattice structure, hydraulic jack (2) symmetric distribution is in the left and right sides of first backing plate (3), surface mounting of first backing plate (3) has drive assembly (18), the outside at drive assembly (18) top is provided with mark subassembly (22), be provided with clamp plate (23) between mark subassembly (22) and drive assembly (18), the left side of drive assembly (18) is provided with extension board (19), the top fixedly connected with fixed cover (20) of extension board (19).
3. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 1, wherein the device comprises the following components: the central axes of the corrugated steel pipe (7), the second backing plate (9) and the screw jack (12) are on the same straight line, and a gap exists between the corrugated steel pipe (7) and the concrete pier (5).
4. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 1, wherein the device comprises the following components: the linear displacement sensors (8) are differential transformation displacement sensors, and the linear displacement sensors (8) are symmetrically distributed on the left side and the right side of the first base plate (3).
5. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 1, wherein the device comprises the following components: the first strain relief (13) is located at the crest of the corrugated steel pipe (7), the second strain relief (14) is located at the antinode of the corrugated steel pipe (7), and the third strain relief (15) is located at the trough of the corrugated steel pipe (7).
6. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 2, wherein: the driving assembly (18) comprises a rotating groove (1801) formed in the top of the first base plate (3), a movable rod (1802) is slidably mounted in the rotating groove (1801), a motor (1803) is fixedly arranged on the left front side of the upper surface of the first base plate (3), a connecting rod (1804) is fixedly connected to the output shaft of the motor (1803), a gear (1805) is arranged on the outer side of the connecting rod (1804) in a fit mode, a toothed ring (1806) is connected to the outer side of the gear (1805) in a meshed mode, the bottom of the toothed ring (1806) is connected with the movable rod (1802), a connecting block (1807) is fixedly arranged around the connecting rod (1804), a damping block (1808) is fixedly connected to the side face of the connecting block (1807), a butting groove (1809) is formed in the upper surface of the gear (1805), and a through hole (16) for the connecting rod (1804) to penetrate through is formed in the middle of the gear (1805).
7. The secondary load considered push-out test device for the reinforced concrete column of the corrugated steel pipe, which is disclosed in claim 6, is characterized in that: the shape of damping piece (1808) is the hemisphere, and damping piece (1808) are rubber material, and outer wall and the inner wall of butt joint groove (1809) of damping piece (1808) lower half laminate each other, butt joint groove (1809) equidistant distribution in the surface of gear (1805), the position and the quantity of butt joint groove (1809) and the position and the quantity one-to-one of damping piece (1808).
8. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 2, wherein: the fixing sleeve (20) is made of high-hardness rubber, the first air nozzle (21) is arranged at the top of the fixing sleeve (20), the inside of the fixing sleeve (20) is hollow, and the cross slit (17) is formed in the middle of the first air nozzle (21).
9. The device for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration as recited in claim 2, wherein: the marking assembly (22) comprises a fixed ring (2201) fixedly arranged at the top of the gear (1805), a rubber sleeve (2202) is fixedly arranged at the top of the fixed ring (2201), a second air tap (2203) is arranged on the surface of the rubber sleeve (2202), and a pressing structure is formed between the pressing plate (23) and the rubber sleeve (2202) through a connecting rod (1804).
10. The method for pushing out the reinforced concrete column of the corrugated steel pipe reinforced by taking secondary load into consideration is characterized by comprising the following steps of:
s1: in order to realize the reinforcement of the reinforced concrete pier column (5) under the holding state, a screw jack (12) is adopted to apply a pre-pressing axial force N to the top of the reinforced concrete pier column (5) 1 Meanwhile, a spring (4) is arranged at the bottom of the pier column to compensate creep deformation of concrete in the loading process, maintain stability of the pre-pressing axial force, eliminate the creep effect and maintain the pre-pressing axial force N 1 Unchanged;
s2: during reinforcement, the position of the screw jack (12) is kept unchanged, the corrugated steel pipe (7) is buckled on the periphery of the concrete pier column (5) in pairs, is arranged on the first backing plate (3), and is used as a pouring template for pouring grouting materials; during pushing out test, the four hydraulic jacks (2) under the first base plate (3) synchronously apply load, and the secondary load force is N 2 ；
S3: the pushing-out acting force is measured through a force sensor (11), the relative sliding of the upper end part of a new interface and an old interface of the concrete pier (5) is measured by an electronic dial indicator (10), and the relative sliding of the middle part, the quarter point and the lower end part of the concrete pier (5) is measured by a built-in electronic sliding meter (6); the longitudinal strain and the transverse strain of the concrete and the longitudinal strain of the grouting material are measured by adopting a buried electronic slip meter (6), and the strain at the wave crest, the antinode and the wave trough of the corrugated steel pipe (7) is measured by adopting a resistance type strain gauge: -a first strain gauge (13), a second strain gauge (14) and a third strain gauge (15);
s4: based on the test result, a failure mechanism of a new and old interface of the reinforced concrete pier column (5) reinforced by the corrugated steel pipe (7) is revealed, a bonding sliding constitutive relation is established, and the influence of the existing damage of the concrete pier column (5) and the interface treatment mode on the interface bonding performance is studied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310791080.6A CN116840143A (en) | 2023-06-30 | 2023-06-30 | Device and method for pushing out test of corrugated steel pipe reinforced concrete column by considering secondary load |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310791080.6A CN116840143A (en) | 2023-06-30 | 2023-06-30 | Device and method for pushing out test of corrugated steel pipe reinforced concrete column by considering secondary load |
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| CN116840143A true CN116840143A (en) | 2023-10-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116840059A (en) * | 2023-06-30 | 2023-10-03 | 哈尔滨工业大学 | Corrugated steel pipe reinforcement pier column axial pressure bias test device and method considering secondary load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116840059A (en) * | 2023-06-30 | 2023-10-03 | 哈尔滨工业大学 | Corrugated steel pipe reinforcement pier column axial pressure bias test device and method considering secondary load |
| CN116840059B (en) * | 2023-06-30 | 2023-12-12 | 哈尔滨工业大学 | Corrugated steel pipe reinforcement pier column axial pressure bias test device and method considering secondary load |
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