CN108120826B - Comprehensive sleeve grouting test device and test method - Google Patents
Comprehensive sleeve grouting test device and test method Download PDFInfo
- Publication number
- CN108120826B CN108120826B CN201810123373.6A CN201810123373A CN108120826B CN 108120826 B CN108120826 B CN 108120826B CN 201810123373 A CN201810123373 A CN 201810123373A CN 108120826 B CN108120826 B CN 108120826B
- Authority
- CN
- China
- Prior art keywords
- steel bar
- grouting
- prefabricated part
- sleeve
- jack
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 66
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 193
- 239000010959 steel Substances 0.000 claims abstract description 193
- 238000004458 analytical method Methods 0.000 claims abstract description 19
- 238000004088 simulation Methods 0.000 claims description 56
- 239000002002 slurry Substances 0.000 claims description 41
- 238000000034 method Methods 0.000 claims description 23
- 230000002457 bidirectional effect Effects 0.000 claims description 17
- 238000013461 design Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000002023 wood Substances 0.000 claims description 10
- 238000010008 shearing Methods 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 4
- 239000006004 Quartz sand Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 5
- 239000011440 grout Substances 0.000 abstract description 4
- 230000009977 dual effect Effects 0.000 abstract 2
- 238000007569 slipcasting Methods 0.000 abstract 2
- 238000005516 engineering process Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The utility model provides a sleeve grout compactness test device, includes self-balancing reaction frame, dual action jack, loading system, goes up prefabricated component, lower prefabricated component, slip casting pipe and slip casting pump, loading system includes jack end plate, jack end plate locating bolt, goes up prefabricated component locating plate, analysis platform and camera, lower prefabricated component passes through lower prefabricated component locating bolt to be fixed on the bottom of self-balancing reaction frame, go up prefabricated component locating plate and pass through last prefabricated component locating bolt to be fixed on last prefabricated component, jack end plate passes through jack end plate locating bolt is fixed on the last prefabricated component locating plate, jack locating bolt is fixed on the top of self-balancing reaction frame to the upper end of dual action jack. The invention provides a sleeve grouting comprehensive test device and a test method, which realize the detection of the grouting compactness of an assembled concrete connecting interface and the grouting compactness of a steel bar connecting sleeve.
Description
Technical Field
The invention relates to a fabricated device the technical field of the concrete structure and the preparation method thereof, in particular to a sleeve grouting comprehensive test device and a sleeve grouting comprehensive test method.
Background
In the field of constructional engineering, an assembled concrete structure is a technology which is promoted by the national and construction industries in recent years, wherein a sleeve grouting connection technology is a main connection form of the assembled concrete structure. Thus, various sleeve forms and corresponding grouting anchoring methods are presented throughout. With the practical application of the sleeve grouting connection method, a plurality of problems also occur, wherein how to ensure the compactness of the sleeve grouting and how to check the quality of the process are always a problem of the industry, and the main reason that the structural form is worry in the application is also that. The current sleeve grouting technology is mainly applied to ensure the grouting connection quality by controlling the construction process flow, and has no good method for post-inspection of quality, wherein the detection effectiveness of ultrasonic wave, directional radar, X-ray and other methods is poor, so that the application quality of the technology is effectively ensured in order to search for effective post-quality detection effects, the working mechanism of the technology is very necessary to be researched, and in actual operation, the grouting quality is influenced by which technology to try to find out corresponding improvement measures. At present, the experimental study on the mechanism of the grouting process is still in a blank stage.
Disclosure of Invention
In order to overcome the defect of poor quality post-inspection effect in the existing sleeve grouting technology, the invention provides a sleeve grouting comprehensive test device and a test method, and realizes the detection of grouting compactness of an assembled concrete connecting interface and grouting compactness of a steel bar connecting sleeve.
The technical scheme adopted for solving the technical problems is as follows:
the sleeve grouting compactness test device comprises a self-balancing reaction frame, a bidirectional jack, a loading system, an upper prefabricated part, a lower prefabricated part, a grouting pipe and a grouting pump, wherein the loading system comprises a jack end plate, jack end plate positioning bolts, an upper prefabricated part positioning plate, an analysis platform and a camera, the lower prefabricated part is fixed on the bottom of the self-balancing reaction frame through lower prefabricated part positioning bolts, the upper prefabricated part is positioned above the lower prefabricated part, the upper prefabricated part positioning plate is fixed on the upper prefabricated part through upper prefabricated part positioning bolts, the jack end plate is fixed on the upper prefabricated part positioning plate through jack end plate positioning bolts, the bidirectional jack is positioned above the jack end plate, and the upper end of the bidirectional jack is fixed on the top of the self-balancing reaction frame through jack positioning bolts;
the grouting pump is communicated with grouting holes of the steel bar connecting sleeve through the grouting pipe;
the upper end of the steel bar connecting sleeve in the upper prefabricated part is fixedly connected with the lower end of the stressed steel bar of the upper prefabricated part, the lower end of the connecting steel bar simulating rod is connected to the upper end of the stressed steel bar of the lower prefabricated part through a connecting nut pre-buried in the lower prefabricated part, and the upper end of the connecting steel bar simulating rod is inserted into the steel bar connecting sleeve through a connecting interface;
the camera is installed on the analysis platform through a camera fixing frame, and the upper prefabricated part or the lower prefabricated part is positioned below the camera, and the connecting interface is opposite to the camera from top to bottom.
A testing method of a sleeve grouting compactness testing device comprises the following steps:
compactness test of connection interface:
(1) Connection interface grouting simulation test
1.1 Determining the simulation sizes of the upper prefabricated part and the lower prefabricated part of the connecting interface according to engineering practice;
1.2 The upper prefabricated part and the lower prefabricated part are assembled concrete parts, the positioning of the steel bar connecting sleeve and the orientation of the grouting holes and the exhaust holes are noted, and when the shearing resistant grooves are arranged on the connecting interface, slurry flowing grooves are reserved;
1.3 After the precast member concrete reaches more than 75% of the design strength, installing the member on the test device according to claim 1, performing pre-connection alignment on the upper precast member and the lower precast member, and determining that the pre-buried steel bar connecting sleeve in the upper precast member and the connecting steel bar simulation rod in the lower precast member can be completely aligned;
1.4 A rubber gasket is arranged at the edge of the upper surface of the lower prefabricated part to prevent the leakage of the slurry at the connecting interface;
1.5 A connecting steel bar simulation rod is screwed on the embedded nut of the lower prefabricated part, the connecting steel bar simulation rod has a smooth outer surface and has the same diameter as the connected stressed steel bars;
1.6 Starting the upper two-way jack to align and compress the upper and lower prefabricated parts;
1.7 Connecting the grouting pipe with the grouting hole of the steel bar connecting sleeve, starting the grouting pump to inject slurry into the steel bar connecting sleeve and the connecting interface, and plugging the exhaust hole by using a wood plug after the exhaust hole of the steel bar connecting sleeve is grouted; grouting holes one by one, and pressurizing and grouting in the last grouting hole after grouting of all grouting holes is completed, wherein only a wood plug of one of the exhaust holes is punched, the exhaust holes are plugged again by a new wood plug, and grouting is completed;
(2) Connection interface compactness test
2.1 After the grouting of the connecting interface is finished, maintaining the grouting material strength to reach the design strength; starting the bidirectional jack to apply a pulling force to the connecting interface until the connecting interface is pulled apart;
2.2 Detaching and installing the upper prefabricated part on an analysis platform, drawing outline lines of the cavity and the air bubble hole, and carrying out fixed-distance shooting through a camera;
2.3 Filling a certain amount of fine quartz sand into the cavity and the air bubble, and recording the filling volume V 1 ；
2.4 Replacement of the upper prefabricated part the lower prefabricated part is formed by the method, the same image pick-up and test are carried out, and the filling volume V is recorded 2 ；
2.1 Calculating the connection interface compactness: mu= (V-V 1 -V 2 ) V is the total volume of the slurry to be poured into the interface, and is the sum of the shearing resistant tank and the slurry flow tank; when the shearing grooves and the slurry flow grooves are not arranged on the connecting interface, the slurry volume in all the steel bar connecting sleeves can be subtracted from the total volume of the slurry injected into the connecting interface by the approximate grouting pump.
A testing method of a sleeve grouting compactness testing device comprises the following steps:
grouting compactness test in steel bar connecting sleeve:
(1) Grouting simulation test for steel bar connecting sleeve
1.1 The simulation component for manufacturing the steel bar connecting sleeve according to the design requirement comprises an upper prefabricated component and a lower prefabricated component, wherein the upper prefabricated component and the lower prefabricated component are respectively designed to be provided with an upper connecting steel plate and a lower connecting steel plate, a steel structure supported by vertical section steel is added in the middle of the lower prefabricated component, and the connecting interface of the upper prefabricated component and the lower prefabricated component is changed into direct connection of the connecting steel plates of the two components;
1.2 Punching holes on the upper end connecting steel plate of the lower prefabricated part according to the designed cross section size of the part and the position of the connecting steel bar, fixing a connecting nut at the lower part, configuring a connecting steel bar simulation rod, inserting the connecting steel bar simulation rod into a steel bar connecting sleeve part to form a smooth outer surface and having the same diameter with the connected stressed steel bar, and matching an external thread at the lower end part of the connecting steel bar simulation rod with the connecting nut;
1.3 A through hole is drilled at the position of a stressed steel bar on a connecting steel plate at the upper end of the upper prefabricated part and the connecting end of the double-acting jack, one end of the stressed steel bar is provided with threads, the other end of the stressed steel bar is tightly matched with a steel bar connecting sleeve, and a double nut is arranged at the threaded end to connect the upper end with the middle of a steel plate clamp so as to adjust the length of the steel bar connecting sleeve, and the length of the stressed steel bar of each steel bar connecting sleeve on a connecting interface is kept consistent;
1.4 The connecting steel bar simulation rod on the lower prefabricated part is screwed in from a connecting nut below the connecting interface, the length of the connecting interface extending out of the connecting nut is the design length of the inserted steel bar connecting sleeve, and the connecting steel bar simulation rod is sleeved in a sealing gasket of the lower opening of the steel bar connecting sleeve; the upper prefabricated part with the steel bar connecting sleeves is lowered, the corresponding connecting steel bar simulation rods are all inserted into the corresponding steel bar connecting sleeves, a bidirectional jack is started, a load is applied to tightly press the sealing gasket, the upper end of each steel bar connecting sleeve is screwed with the upper nut and the lower nut of the stressed steel bar, and the upper prefabricated part and the lower prefabricated part are installed in place and fixed;
1.5 According to the grouting process of the actual engineering, connecting a grouting pump and a grouting pipe, or simulating the actual engineering to connect each sleeve grouting hole and each exhaust hole to one side or two sides grouting holes by using a plastic pipe and a three-way pipe for grouting;
1.6 A grouting pump is started, grouting is carried out through grouting holes one by one, after the corresponding exhaust holes are overflowed, the exhaust holes are plugged by a wood plug, and grouting is finished after all the exhaust holes are overflowed;
(2) Slurry compactness test in steel bar connecting sleeve
2.1 After the grouting slurry is finally solidified, screwing out the connecting steel bar simulation rod from the lower end of the lower prefabricated part; and removing all connecting pipes connected with the grouting holes of the steel bar connecting sleeve.
2.2 Observing the distribution condition of gaps and bubbles around the connecting steel bar simulation rod in the steel bar connecting sleeve;
2.3 After the injected slurry reaches the design strength, a water pressing nozzle is connected to the lower prefabricated part at the position where the connecting steel bar simulation rod is installed, a small water pump is started, water is pressed into the steel bar connecting sleeve, the void volume in the steel bar connecting sleeve is calculated by measuring the pressed water quantity, and the compactness of the injected slurry in the sleeve can be expressed as follows: mu '= (V' -V) 1 ′-V 2 ' V ', where V ' is the internal volume of the reinforcing bar coupler sleeve, V 1 ' is the volume of the connecting steel bar simulation rod, V 2 ' is the amount of water pressed in;
if the compaction condition of the grouting of the steel bar connecting sleeve needs to be further observed, the upper prefabricated part can be moved to an analysis platform for cutting and analysis, and the distribution and the quantity of bubbles are analyzed through the camera shooting.
The beneficial effects of the invention are mainly shown in the following steps: integrating the grouting compactness of the assembled concrete connecting interface and the grouting compactness test of the steel bar connecting sleeve into a set of device; measuring the volume of a grouting non-compact area of a concrete member connecting interface by a sand filling method; and measuring the void volume in the steel bar connecting sleeve by using a water pressing method, so as to analyze the grouting compactness of the steel bar connecting sleeve.
Drawings
FIG. 1 is a schematic view of the structure of the test apparatus of the present invention.
FIG. 2 is a schematic diagram of a connection interface compactness analysis platform.
Fig. 3 is a top view of the connection interface of the lower prefabricated element.
Fig. 4 is a bottom view of the connection interface of the upper prefabricated element.
Fig. 5 is a schematic diagram of a grouting compactness test device for the steel bar connecting sleeve.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1 to 5, a sleeve grouting compactness test device comprises a self-balancing reaction frame 4, a bidirectional jack 5, a loading system, an upper prefabricated part 3, a lower prefabricated part 1, a grouting pipe 20 and a grouting pump 19, wherein the loading system comprises a jack end plate 8, a jack end plate positioning bolt 9, an upper prefabricated part positioning plate 10, an analysis platform and a camera 21, the lower prefabricated part 1 is fixed on the bottom of the self-balancing reaction frame 4 through a lower prefabricated part positioning bolt 6, the upper prefabricated part 3 is positioned above the lower prefabricated part 1, the upper prefabricated part positioning plate 10 is fixed on the upper prefabricated part 3 through an upper prefabricated part positioning bolt 11, the jack end plate 8 is fixed on the upper prefabricated part positioning plate 10 through the jack end plate positioning bolt 9, the bidirectional jack 5 is positioned above the jack end plate 8, and the upper end of the bidirectional jack 5 is fixed on the top of the self-balancing reaction frame 4 through a jack positioning bolt 7;
the grouting pump 19 is communicated with the grouting holes 18 of the steel bar connecting sleeve 13 through the grouting pipe 20;
the upper end of a steel bar connecting sleeve 13 in the upper prefabricated part 3 is fixedly connected with the lower end of an upper prefabricated part stressed steel bar 12, the lower end of a connecting steel bar simulation rod 14 is connected to the upper end of a lower prefabricated part stressed steel bar 16 through a connecting nut 15 pre-embedded in the lower prefabricated part 1, and the upper end of the connecting steel bar simulation rod 14 is inserted into the steel bar connecting sleeve 13 through a connecting interface 2;
the camera 21 is mounted on the analysis platform through a camera fixing 22 frame, the upper prefabricated part 3 or the lower prefabricated part 1 is positioned below the camera 21, and the connecting interface 2 is opposite to the camera 21 vertically.
The invention aims at researching the mechanism of the assembly type concrete structure connection mode-the steel bar sleeve grouting connection mode, and the main research content comprises the experimental simulation of the forming process of the technological process, so as to find out the influence rule of each factor related to the grouting compactness, thereby finding out the key technology for improving the grouting compactness, and further finding out the effective post-detection technology for the grouting quality.
The design principle of the test device is that the test device is used for testing a similar theory, according to the basic requirement of the similar theory and in combination with the process characteristics of sleeve grouting, slurry tanks, key grooves, sleeves and the like on a connecting interface are connected according to common solid components to simulate, and meanwhile, prototype concrete and grouting slurry materials are adopted for concrete prefabricated components to establish a physical test model. Wherein, the steel bar connecting sleeve adopts two basic types of a prototype and a transparent sleeve, and the grouting process adopts a prototype process and a machine tool; the lengths of the components at two sides of the connecting interface are similar simulated, the components are shortened as much as possible under the grouting simulation condition without influencing the connecting interface, and the gravity-insufficient part is simulated by adopting an external load mode.
The compactness of sleeve grout is through the mode actual measurement of opening the model, wherein adopts directly to pull open the connection interface back to the compactness on the connection interface, measures cavity, bubble isovolumetric realization, and the intraductal compactness of sleeve also passes through the actual measurement compactness after cutting the sleeve. The influences of different factors on grouting compactness are measured by changing parameters such as sleeve type, grouting process and the like.
By changing the placing direction of the test device, the connecting interfaces of different stress components can be simulated.
According to the method, the flow rule of grouting slurry and the evaluation method of grouting compactness of the connecting interface and the steel bar connecting sleeve are determined, and in order to find the flow rule of grouting slurry, the connecting process of the connecting interface in actual engineering is simulated and introduced into a test, so that a test device as shown in figure 1 is developed.
The test device mainly comprises a steel self-balancing reaction frame 4, an upper prefabricated part 3, a lower prefabricated part 1, a connecting interface and corresponding grouting equipment. For the convenience of test, the full-size prefabricated component is not adopted in the research, but only the section of the component is considered according to the full-size model, and only a part of the length of the component is taken, and for simulating the gravity influence in actual engineering and the convenience of installation of a connecting interface, a bidirectional jack 5 and a loading system for correspondingly pressing and pulling the interface are configured. The grouting device can be used for carrying out test comparison on grouting modes of different steel bar connecting sleeves, analyzing the influence of different sleeves and slurry on slurry flow, and only changing simulated prefabricated components is needed for each test.
In order to analyze the grouting condition of the connecting interface, an analysis platform is also arranged, as shown in figure 2, the connecting interfaces pulled apart after the test are respectively fixed, the cavity and bubble distribution of the interfaces are recorded in a fixed shooting mode, and the volume of the cavity and bubble distribution is measured; meanwhile, the steel bar sleeve can be taken out of the component, and grouting compactness of the steel bar sleeve can be tested and analyzed independently.
The specific test scheme of the invention is as follows:
1. compactness test of common connection interface
The device can perform grouting compactness tests under various connection interface conditions, and mainly can be used for grouting interface compactness tests of connection interfaces such as column-column, column-beam, beam-beam, wall-wall, wall-beam and the like. Taking a column-column connection interface as an example, the test scheme is described:
(1) Grouting test for connecting interface
1.1 According to the actual simulation size of the engineering, selecting a section full-scale model (for example, a rectangular column a multiplied by b) as far as possible, wherein the model size in the column length direction is larger than or equal to b, and the length size of the member is preferably larger than 1.5 times of the length of the reinforcing steel sleeve.
1.2 Prefabricated concrete components according to engineering design drawing, attention is paid to the positioning of the steel bar connecting sleeve, the orientation of the grouting holes and the exhaust holes, and a slurry flow groove 25 is reserved when a shearing resistant groove 24 is arranged on the connecting interface, as shown in fig. 4.
1.3 After the precast member concrete reaches more than 75% of the design strength, the member is installed on a test device, the upper precast member and the lower precast member are pre-connected and aligned, and the test can be carried out after the fact that the pre-buried steel bar connecting sleeve 13 in the upper precast member 3 and the connecting steel bar simulation rod in the lower precast member 1 can be completely aligned is determined.
1.4 A rubber gasket 23 is provided at the upper surface edge of the lower prefabricated element 1 to prevent leakage of the slurry at the joint interface as shown in fig. 3; the thickness of the gasket is larger than the grouting thickness requirement of the prefabricated part interface, and is generally not smaller than 25mm.
1.5 A connecting bar simulation rod 14 is screwed on the pre-buried connecting nut 15 of the lower prefabricated member, and the connecting bar simulation rod 14 has the same diameter as the connected stress bar and has a smooth outer surface.
1.6 The upper bidirectional jack 5 is started to align and compress the upper prefabricated component and the lower prefabricated component, the loading value of the bidirectional jack is determined by the column dead weight of the designed upper component, and the difference between the actual prefabricated column dead weight and the model prefabricated column dead weight is taken as the vertical loading.
1.7 A grouting pipe 20 is connected with a grouting hole 18 of the steel bar connecting sleeve 13, a grouting pump 19 is started to inject grout into the steel bar connecting sleeve 13 and the connecting interface 2, and after the exhaust hole 17 of the steel bar connecting sleeve is out of the grout, a wood plug is used for plugging the exhaust hole; grouting holes one by one, pressurizing and grouting in the last grouting hole after grouting of all grouting holes 18 is completed, as soon as the plug of one of the exhaust holes is punched out and the exhaust hole 17 is to be plugged again with a new plug, the grouting is ended.
(2) Connection interface compactness test
2.1 After grouting of the connecting interface 2 is finished, carrying out compactness test on the connecting interface after the strength of the cured grouting material reaches the design strength; the bi-directional jack 5 is activated to apply tension to the connection interface until the connection interface is pulled apart.
2.2 Detaching and installing the upper prefabricated part 3 on an analysis platform, drawing outline lines of the cavity and the air bubble hole, and carrying out fixed-distance shooting through a camera;
2.3 Filling a certain amount of fine quartz sand into the cavity and the air bubble, and recording the filling volume V 1 。
2.4 The upper prefabricated part 3 is replaced by the lower prefabricated part 1, the same shooting and testing are carried out, and the filling volume V is recorded 2 。
2.5 Calculating the connection interface compactness: mu= (V-V 1 -V 2 ) V is the total volume of the slurry to be poured into the interface, and is the sum of the shearing resistant tank and the slurry flow tank; when no shearing grooves and no slurry flow grooves are arranged on the connection interface, the slurry volume in all the steel bar connection sleeves can be subtracted from the total slurry volume injected into the connection interface by the approximate grouting pump.
2. Grouting compactness test in steel bar connecting sleeve
The device specially aiming at the grouting compactness test of the steel bar connecting sleeve can be simply modified by the device of figure 1, the counterforce frame, the jack, the grouting pump and the grouting pipeline of the device are unchanged, and only the simulation component 1 and the component 3 are modified into the simulation component aiming at the steel bar sleeve. The specific test protocol is as follows:
(1) Grouting simulation test for steel bar connecting sleeve
1.1 For the grouting compaction test of the special steel bar connecting sleeve, the simulation object can be directly set as the steel bar connecting sleeve without simulating the concrete in the member, so as to facilitate the installation and test of the test process, the upper and lower prefabricated parts can be designed to have upper and lower connecting steel plates, a steel structure with a vertical section steel support 26 in the middle of the lower prefabricated part, and the connecting interface of the upper and lower prefabricated parts is changed into direct connection of the connecting steel plates of the two parts, as shown in fig. 5.
1.2 On the upper end connecting steel plate of the lower prefabricated part 1, according to the designed cross-section size of the part and the position of the connected stressed steel bar, as shown in figure 3, punching and fixing a connecting nut at the lower part, configuring a connecting steel bar simulation rod, inserting the simulation rod into the steel bar sleeve part to be a smooth outer surface and having the same diameter as the connected stressed steel bar, and matching the external thread at the lower end of the connecting steel bar simulation rod with the connecting nut at the lower part of the connecting steel plate.
1.3 Through holes are drilled at the positions of stressed steel bars on the connecting steel plates at the upper ends of the upper prefabricated parts 3 and the connecting ends of the double-acting jacks 5, one ends of the stressed steel bars are provided with threads, the other ends of the stressed steel bars are connected with the steel bar connecting sleeves in a tight fit manner, double nuts are arranged at the threaded ends to connect the upper ends of the upper prefabricated parts with the middle of the steel plate clamps, so that the lengths of the stressed steel bar connecting sleeves are adjusted, and the lengths of the stressed steel bars of the steel bar connecting sleeves on the connecting interface are kept consistent.
1.4 The connecting steel bar simulation rod on the lower prefabricated part 1 is screwed in from a connecting nut below the connecting interface, the length of the connecting interface 2 extending out of the connecting nut is the design length of the inserted steel bar connecting sleeve, and the connecting steel bar simulation rod is sleeved in a sealing gasket 27 of the lower opening of the steel bar connecting sleeve; and (3) lowering the upper prefabricated part provided with the steel bar connecting sleeve, enabling the corresponding connecting steel bar simulation rods to be fully inserted into the corresponding steel bar connecting sleeve, starting the bidirectional jack, applying load to compress the sealing gasket, screwing up the upper nut and the lower nut of the upper end of each steel bar connecting sleeve, and connecting the stressed steel bars, so that the upper prefabricated part and the lower prefabricated part are installed in place and are fixed.
1.5 According to the grouting process of actual engineering, connecting a grouting pump and an external grouting pipe. The grouting device can simulate the actual engineering to perform grouting by connecting the grouting holes and the exhaust holes of the steel bar connecting sleeve with the grouting holes on one side or two sides by using a plastic pipe and a three-way pipe.
1.6 The grouting pump is started, grouting is carried out through grouting holes one by one, after the corresponding exhaust holes are overflowed, the exhaust holes are plugged by a wood plug, and grouting is finished after all the exhaust holes are overflowed.
(2) Slurry compactness test in steel bar connecting sleeve
2.1 After the grouting slurry is finally solidified, carefully screwing out the connecting steel bar simulation rod from the lower end of the lower prefabricated part; and removing all plastic pipes and the three-way pipe of the steel bar connecting sleeve.
2.2 Observing the distribution of gaps and bubbles at the periphery of the connecting steel bar simulation rod in the steel bar sleeve;
2.3 After the injected slurry reaches the design strength, a water pressing nozzle is connected to the lower prefabricated part at the position where the connecting steel bar simulation rod is installed, a small water pump is started, water is pressed into the steel bar connecting sleeve, the void volume in the steel bar connecting sleeve is calculated by measuring the pressed water quantity, and the compactness of the injected slurry in the sleeve can be expressed as follows: mu '= (V' -V) 1 ′-V 2 ' V ', where V ' is the internal volume of the reinforcing bar coupler sleeve, V 1 ' is the volume of the connecting steel bar simulation rod, V 2 ' is the amount of water pressed in.
2.4 The upper member can be moved to an analysis platform for further cutting and analysis by further observing the compaction condition of the grouting of the steel bar sleeve, and the distribution and the quantity of bubbles are analyzed by camera shooting.
Claims (4)
1. A sleeve grouting compactness test device is characterized in that: comprises a self-balancing reaction frame,
The device comprises a bidirectional jack, a loading system, an upper prefabricated part, a lower prefabricated part, a grouting pipe and a grouting pump, wherein the loading system comprises a jack end plate, jack end plate positioning bolts, an upper prefabricated part positioning plate, an analysis platform and a camera, the lower prefabricated part is fixed on the bottom of a self-balancing counter-force frame through a lower prefabricated part positioning bolt, the upper prefabricated part is positioned above the lower prefabricated part, the upper prefabricated part positioning plate is fixed on the upper prefabricated part through an upper prefabricated part positioning bolt, the jack end plate is fixed on the upper prefabricated part positioning plate through a jack end plate positioning bolt, the bidirectional jack is positioned above the jack end plate, and the upper end of the bidirectional jack is fixed on the top of the self-balancing counter-force frame through a jack positioning bolt;
the grouting pump is communicated with grouting holes of the steel bar connecting sleeve through the grouting pipe, and the steel bar connecting sleeve is also provided with an exhaust hole;
the upper end of the steel bar connecting sleeve in the upper prefabricated part is fixedly connected with the lower end of the stressed steel bar of the upper prefabricated part, the lower end of the connecting steel bar simulating rod is connected to the upper end of the stressed steel bar of the lower prefabricated part through a connecting nut pre-buried in the lower prefabricated part, and the upper end of the connecting steel bar simulating rod is inserted into the steel bar connecting sleeve through a connecting interface;
the camera is installed on the analysis platform through a camera fixing frame, the connecting interfaces pulled apart after the test are respectively fixed on the analysis platform, and the upper prefabricated part or the lower prefabricated part is positioned below the camera and the connecting interfaces are opposite to the camera from top to bottom.
2. A method of testing a sleeve grouting compactness testing device according to claim 1, wherein: the method comprises the following steps:
compactness test of connection interface:
(1) Connection interface grouting simulation test
1.1 Determining the simulation sizes of the upper prefabricated part and the lower prefabricated part of the connecting interface according to engineering practice;
1.2 The upper prefabricated part and the lower prefabricated part are assembled concrete parts, the positioning of the steel bar connecting sleeve and the orientation of the grouting holes and the exhaust holes are noted, and when the shearing resistant grooves are arranged on the connecting interface, slurry flowing grooves are reserved;
1.3 After the precast member concrete reaches more than 75% of the design strength, installing the member on the test device according to claim 1, performing pre-connection alignment on the upper precast member and the lower precast member, and determining that the pre-buried steel bar connecting sleeve in the upper precast member and the connecting steel bar simulation rod in the lower precast member can be completely aligned;
1.4 A rubber gasket is arranged at the edge of the upper surface of the lower prefabricated part to prevent the leakage of the slurry at the connecting interface;
1.5 A connecting bar simulation rod is screwed on the embedded connecting nut of the lower prefabricated part, the connecting bar simulation rod has a smooth outer surface and has the same diameter as the connected stressed steel bars;
1.6 Starting the upper two-way jack to align and compress the upper and lower prefabricated parts;
1.7 Connecting the grouting pipe with the grouting hole of the steel bar connecting sleeve, starting the grouting pump to inject slurry into the steel bar connecting sleeve and the connecting interface, and plugging the exhaust hole by using a wood plug after the exhaust hole of the steel bar connecting sleeve is grouted; grouting holes one by one, and pressurizing and grouting in the last grouting hole after grouting of all grouting holes is completed, wherein only a wood plug of one of the exhaust holes is punched, the exhaust holes are plugged again by a new wood plug, and grouting is completed;
(2) Connection interface compactness test
2.1 After the grouting of the connecting interface is finished, maintaining the grouting material strength to reach the design strength; starting the bidirectional jack to apply a pulling force to the connecting interface until the connecting interface is pulled apart;
2.2 Detaching and installing the upper prefabricated part on an analysis platform, drawing outline lines of the cavity and the air bubble hole, and carrying out fixed-distance shooting through a camera;
2.3 Filling a certain amount of fine quartz sand into the cavity and the air bubble, and recording the filling volume V 1 ；
2.4 The upper prefabricated part is replaced by the lower prefabricated part, the same shooting and testing are carried out, and the filling volume V is recorded 2 ；
2.5 Calculating the connection interface compactness: mu= (V-V 1 - V 2 ) V is the total volume of the slurry to be poured into the interface, and is the sum of the volume of the shearing resistant tank and the volume of the slurry flowing tank; when no shearing grooves and no slurry flow grooves are arranged on the connecting interface, the total volume of slurry injected into the connecting interface by the grouting pump is subtracted from the volume of slurry in all the steel bar connecting sleeves.
3. A method of testing a sleeve grouting compactness testing device according to claim 1, wherein: the method comprises the following steps:
grouting compactness test in steel bar connecting sleeve:
(1) Grouting simulation test for steel bar connecting sleeve
1.1 The simulation component for manufacturing the steel bar connecting sleeve according to the design requirement comprises an upper prefabricated component and a lower prefabricated component, wherein the upper prefabricated component and the lower prefabricated component are respectively designed to be provided with an upper connecting steel plate and a lower connecting steel plate, a steel structure supported by vertical section steel is added in the middle of the lower prefabricated component, and the connecting interface of the upper prefabricated component and the lower prefabricated component is changed into direct connection of the connecting steel plates of the two components;
1.2 Punching holes on the upper end connecting steel plate of the lower prefabricated part according to the designed section size of the lower prefabricated part and the position of the connected stressed steel bar, fixing a connecting nut at the lower part, configuring a connecting steel bar simulation rod, inserting the connecting steel bar simulation rod into a steel bar connecting sleeve to form a smooth outer surface, and matching the connecting steel bar with the connecting stressed steel bar, wherein the outer thread at the lower end of the connecting steel bar simulation rod is matched with the connecting nut;
1.3 A through hole is drilled at the position of a stressed steel bar on a connecting steel plate at the upper end of the upper prefabricated part and the connecting end of the double-acting jack, one end of the stressed steel bar is provided with threads, the other end of the stressed steel bar is tightly matched with a steel bar connecting sleeve, and a double nut is arranged at the threaded end to connect the upper end with the middle of a steel plate clamp so as to adjust the length of the steel bar connecting sleeve, and the length of the stressed steel bar of each steel bar connecting sleeve on a connecting interface is kept consistent;
1.4 The connecting steel bar simulation rod on the lower prefabricated part is screwed in from a connecting nut below the connecting interface, the length of the connecting interface extending out of the connecting nut is the design length of the inserted steel bar connecting sleeve, and the connecting steel bar simulation rod is sleeved in a sealing gasket of the lower opening of the steel bar connecting sleeve; the upper prefabricated part with the steel bar connecting sleeves is lowered, the corresponding connecting steel bar simulation rods are all inserted into the corresponding steel bar connecting sleeves, a bidirectional jack is started, a load is applied to tightly press the sealing gasket, double nuts of the upper end of each steel bar connecting sleeve, which are connected with stressed steel bars, are screwed, and the upper prefabricated part and the lower prefabricated part are installed in place and fixed;
1.5 According to the grouting process of the actual engineering, connecting a grouting pump and a grouting pipe, or simulating the actual engineering to connect each sleeve grouting hole and each exhaust hole to one side or two sides grouting holes by using a plastic pipe and a three-way pipe for grouting;
1.6 A grouting pump is started, grouting is carried out through grouting holes one by one, after the corresponding exhaust holes are overflowed, the exhaust holes are plugged by a wood plug, and grouting is finished after all the exhaust holes are overflowed;
(2) Slurry compactness test in steel bar connecting sleeve
2.1 After the grouting slurry is finally solidified, screwing out the connecting steel bar simulation rod from the lower end of the lower prefabricated part; removing all connecting pipes connected with the grouting holes of the steel bar connecting sleeve;
2.2 Observing the distribution condition of gaps and bubbles around the connecting steel bar simulation rod in the steel bar connecting sleeve;
2.3 After the injected slurry reaches the design strength, a water pressing nozzle is connected to the lower prefabricated part at the position where the connecting steel bar simulation rod is installed, a small water pump is started, water is pressed into the steel bar connecting sleeve, the void volume in the steel bar connecting sleeve is calculated by measuring the pressed water quantity, and the compactness of the injected slurry in the sleeve can be expressed as follows: mu '= (V' -V) 1 ′- V 2 ' V ', where V ' is the internal volume of the reinforcing bar coupler sleeve, V 1 ' is the volume of the connecting steel bar simulation rod, V 2 ' is the amount of water pressed in.
4. The test method according to claim 3, wherein if the compaction of the grouting of the steel bar connecting sleeve is further observed, the upper prefabricated part is moved to an analysis platform for cutting and analysis, and the distribution and the number of bubbles are analyzed by camera shooting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123373.6A CN108120826B (en) | 2018-02-07 | 2018-02-07 | Comprehensive sleeve grouting test device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123373.6A CN108120826B (en) | 2018-02-07 | 2018-02-07 | Comprehensive sleeve grouting test device and test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108120826A CN108120826A (en) | 2018-06-05 |
| CN108120826B true CN108120826B (en) | 2023-12-29 |
Family
ID=62234412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810123373.6A Active CN108120826B (en) | 2018-02-07 | 2018-02-07 | Comprehensive sleeve grouting test device and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108120826B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108680416B (en) * | 2018-08-02 | 2023-05-30 | 华北理工大学 | Grouting frame for steel bar sleeve connection test for grouting of various defects and construction method |
| CN110823706B (en) * | 2019-11-08 | 2021-07-02 | 东南大学 | Device and method for detecting vertical connection quality of upper and lower prefabricated parts |
| CN110967278B (en) * | 2019-11-25 | 2022-04-05 | 浙江中信检测有限公司 | Compactness detection system for engineering detection and detection method thereof |
| CN111044428B (en) * | 2019-12-24 | 2022-10-11 | 上海浦东路桥(集团)有限公司 | Quality detection system and method for connecting part of prefabricated part |
| CN113189312A (en) * | 2021-04-27 | 2021-07-30 | 中国一冶集团有限公司 | Simulation assembly type prefabricated wall grouting process test system |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060059763A (en) * | 2004-11-29 | 2006-06-02 | 티에스스틸산업 주식회사 | Steel reinforcing connection sleeve and precast concrete member using the same |
| CN103048439A (en) * | 2012-12-04 | 2013-04-17 | 三峡大学 | Pressure grouting experiment device |
| CN103499492A (en) * | 2013-10-01 | 2014-01-08 | 浙江工业职业技术学院 | Device and method for testing load in pile-end post-grouting chamber |
| CN104865352A (en) * | 2015-05-28 | 2015-08-26 | 中国建筑第八工程局有限公司 | Detection method and detection structure for grouting density of prefabricated part |
| CN105223344A (en) * | 2015-10-19 | 2016-01-06 | 北京智博联科技股份有限公司 | A kind of method and detector detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness |
| CN106124569A (en) * | 2016-08-30 | 2016-11-16 | 北京智博联科技股份有限公司 | A kind of for measuring the reinforced bar sleeve grouting probe of plumpness and method |
| CN106769441A (en) * | 2016-11-15 | 2017-05-31 | 中国建筑科学研究院 | Method for detecting solid strength and construction quality of grouting material for grouting connection of steel bar sleeve |
| CN106840977A (en) * | 2017-02-16 | 2017-06-13 | 华北科技学院 | Slurry filling imitation device |
| CN206460020U (en) * | 2017-02-16 | 2017-09-01 | 江苏森淼工程质量检测有限公司 | A kind of device for detecting prestressed component pore squeezing quality |
| CN207964825U (en) * | 2018-02-07 | 2018-10-12 | 浙江工业大学工程设计集团有限公司 | A kind of sleeve grouting integrated experiment device |
-
2018
- 2018-02-07 CN CN201810123373.6A patent/CN108120826B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20060059763A (en) * | 2004-11-29 | 2006-06-02 | 티에스스틸산업 주식회사 | Steel reinforcing connection sleeve and precast concrete member using the same |
| CN103048439A (en) * | 2012-12-04 | 2013-04-17 | 三峡大学 | Pressure grouting experiment device |
| CN103499492A (en) * | 2013-10-01 | 2014-01-08 | 浙江工业职业技术学院 | Device and method for testing load in pile-end post-grouting chamber |
| CN104865352A (en) * | 2015-05-28 | 2015-08-26 | 中国建筑第八工程局有限公司 | Detection method and detection structure for grouting density of prefabricated part |
| CN105223344A (en) * | 2015-10-19 | 2016-01-06 | 北京智博联科技股份有限公司 | A kind of method and detector detecting prefabricated concrete structure reinforced bar sleeve grouting plumpness |
| CN106124569A (en) * | 2016-08-30 | 2016-11-16 | 北京智博联科技股份有限公司 | A kind of for measuring the reinforced bar sleeve grouting probe of plumpness and method |
| CN106769441A (en) * | 2016-11-15 | 2017-05-31 | 中国建筑科学研究院 | Method for detecting solid strength and construction quality of grouting material for grouting connection of steel bar sleeve |
| CN106840977A (en) * | 2017-02-16 | 2017-06-13 | 华北科技学院 | Slurry filling imitation device |
| CN206460020U (en) * | 2017-02-16 | 2017-09-01 | 江苏森淼工程质量检测有限公司 | A kind of device for detecting prestressed component pore squeezing quality |
| CN207964825U (en) * | 2018-02-07 | 2018-10-12 | 浙江工业大学工程设计集团有限公司 | A kind of sleeve grouting integrated experiment device |
Non-Patent Citations (2)
| Title |
|---|
| 无损伤检测技术在套筒灌浆密实度检测中的应用研究;陈旭东 等;兰州工业学报;第24卷(第1期);第49-53页 * |
| 测量新老混凝土粘结面粗糙度的方法;赵志方 等;建筑结构;第30卷(第1期);第26-29页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108120826A (en) | 2018-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108120826B (en) | Comprehensive sleeve grouting test device and test method | |
| CN104374649B (en) | A kind of experimental rig and method for being used to observe shear deformation breaks down feature between pile tube and the slip casting soil body | |
| CN105259107A (en) | Device for testing bond performance of reinforcing steel bar and concrete through drawing and testing method | |
| CN109868849B (en) | Pile-soil interaction visual test device and test method thereof | |
| CN107817162B (en) | Rapid drawing test method for nonmetal anti-floating anchor rod with enlarged head | |
| CN111794293B (en) | Drawing test device for compacted grouting soil nails | |
| CN107621412B (en) | Quick drawing test device for nonmetal anti-floating anchor rod with enlarged head | |
| US11774335B2 (en) | Experimental system of surrounding rock and lining structure under unequal surrounding pressure and water pressure | |
| CN102704459A (en) | Test device of indoor model for reinforcing soft soil foundation by dynamic compaction | |
| CN110398429A (en) | A kind of concrete filled steel tube Experimental Study on Seismic Behavior device and test method considering that work progress influences | |
| CN110067267B (en) | Indoor simulation experiment device and method for rotary-spraying steel pipe combined pile loaded with multiple modes | |
| CN205049466U (en) | Device of survey concrete and steel bar anchoring bearing capacity | |
| CN105372390A (en) | Three-dimensional grouting testing device and testing method | |
| CN103321259B (en) | Testing system for anchor network reinforcement of underground engineering broken surrounding rock | |
| CN204903304U (en) | Tensile test device is opened by prestressing force carbon fiber plate ground tackle system for structural strengthening | |
| CN113848122B (en) | Hydraulic tunnel surrounding rock and lining structure simulation test method considering external water pressure | |
| CN113686603B (en) | Combined bearing simulation test method for surrounding rock and lining structure of deep-buried tunnel | |
| CN207964825U (en) | A kind of sleeve grouting integrated experiment device | |
| CN115165699A (en) | Device and method for visually measuring seepage effect of magnetic mortar in rock fracture plugging at multiple angles | |
| CN205049465U (en) | Simple and easy survey concrete and device of steel bar anchoring bearing capacity | |
| CN106248480B (en) | Tunnel lining structure crack treatment imitative experiment platform and experimental method | |
| CN109738275B (en) | Rock and concrete interface shear performance testing arrangement | |
| CN108459154B (en) | Concrete wet joint test bed with constraint function and test method | |
| CN208917889U (en) | The experimental rig of embedded rock pile bearer properties in a kind of analog composite rock stratum | |
| CN112033818A (en) | External pressure load test device that reinforced concrete drain pipe was made |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |