CN214539193U - Test device for detecting bonding strength between sprayed concrete and surrounding rock - Google Patents
Test device for detecting bonding strength between sprayed concrete and surrounding rock Download PDFInfo
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- CN214539193U CN214539193U CN202120749851.1U CN202120749851U CN214539193U CN 214539193 U CN214539193 U CN 214539193U CN 202120749851 U CN202120749851 U CN 202120749851U CN 214539193 U CN214539193 U CN 214539193U
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Abstract
The utility model provides a test device for detecting the bonding strength between sprayed concrete and surrounding rocks, which belongs to the technical field of concrete quality detection and comprises a surrounding rock sample fixing box, a cylindrical slicing and assembling steel mould, a pre-embedded lacing wire fixing rod and a pre-embedded lacing wire; the surrounding rock sample fixing box comprises a top plate, a bottom plate and a side plate for connecting the top plate and the bottom plate; a circular hole is formed in the top plate; side holes are arranged on the side plates; the piece-separating assembled steel die is formed by enclosing a plurality of equally-separated arc-shaped matrixes, and the arc-shaped matrixes are detachably connected with a top plate of the surrounding rock sample fixing box; the pre-embedded lacing wires are positioned on the central shaft of the slicing and assembling steel die; the steel mould is assembled to the burst to many pre-buried lacing wire dead levers evenly setting, and the top can be dismantled with pre-buried lacing wire and be connected, and the bottom can be dismantled with the roof of the fixed box of country rock sample and be connected. The utility model discloses when detecting shotcrete and country rock bonding strength, avoided the destruction of strutting in the tunnel, protected its wholeness.
Description
Technical Field
The utility model belongs to the technical field of concrete quality detects, a detect test device of bonding strength between shotcrete and country rock specifically is disclosed.
Background
The sprayed concrete is a common construction method for tunnel and cavern support, the detection of the bonding strength of the sprayed concrete is an important means for detecting the quality of the sprayed concrete, and the early bonding strength of the sprayed concrete and surrounding rock directly influences the economic benefit and the construction difficulty of the sprayed concrete and the surrounding rock. When the sprayed concrete is applied to the surface of the surrounding rock, the bonding strength of the sprayed concrete has great influence on the rebound rate of the sprayed concrete, so that the accurate detection of the bonding strength of the sprayed concrete has great significance on tunnel construction. In relevant specifications, such as technical specification of geotechnical anchor rod and shotcrete support engineering (GB50086-2015), technical specification of shotcrete application (JGJ/T372-2016), and the like, the bond strength test of the shotcrete mainly comprises the following three types:
1. drawing a reserved test piece: during construction, a sample is reserved in a support test point in advance, and after the concrete reaches a preset age, the reserved sample is subjected to strength detection on a construction site;
2. core drilling and drawing method: after the sprayed concrete support reaches the specified age, drilling a test piece by using a drilling machine, and then performing an axial tension test on the drilled test piece in a laboratory;
3. and (3) a large plate spraying indoor splitting method: and (3) on a construction site, spraying concrete into the large plate mould, carrying out maintenance for a certain time and under certain conditions on the construction site, bringing the large plate mould back to a laboratory, and carrying out related mechanical tests according to a specified age.
In the three methods, the method 1 and the method 2 have certain influence on the integrity of the support after the test piece is loaded to be damaged, so that batch tests cannot be carried out in the same area, and the experimental data have certain contingency. In addition, if the early strength is to be measured, the surrounding rock is not completely stable at the moment, and the integrity of the support is not easy to damage, so the former two methods are generally used for strength testing in the 28d age, the systematicness and comprehensiveness of the strength testing are all in short supply, and after the test piece is loaded to be damaged, the damaged part needs to be repaired, and the procedure is complicated. In addition, the core-drilling drawing method disturbs the adhesion between the concrete and the surrounding rock to a certain extent when a core sample is drilled, so that the test result deviates from the real strength. The device used by the reserved test piece drawing method is complex to assemble and poor in environmental adaptability.
For the method 3, a mould is adopted to load the test piece, and the loading test is carried out after the test piece reaches the specified age, but the bonding strength between the concrete and the surrounding rock, which has great guiding significance for the construction, cannot be directly tested because the concrete and the surrounding rock body have no contact surface.
The three testing methods have defects of different degrees in different aspects, and have respective defects in systematicness, scientificity, comprehensiveness and accuracy.
SUMMERY OF THE UTILITY MODEL
In order to overcome the problem, this patent provides a test device of bonding strength between detection shotcrete and country rock, supports the bonding between shotcrete and the country rock in the simulation engineering reality to set up pre-buried lacing wire, be used for carrying out the loading to the test piece that arrives predetermined age, produce the disturbance to the test piece because of lacking the medium of applying the load when avoiding the loading. Meanwhile, the device can independently manufacture a test piece without influencing the support integrity.
In order to achieve the purpose, the utility model provides a test device for detecting the bonding strength between sprayed concrete and surrounding rock, which comprises a surrounding rock sample fixing box, a cylindrical partitioned assembled steel mould, a pre-embedded lacing wire fixing rod and a pre-embedded lacing wire; the surrounding rock sample fixing box comprises a top plate, a bottom plate and a side plate for connecting the top plate and the bottom plate; the top plate is provided with a round hole matched with the slicing and assembling steel die; a side hole for taking and placing a surrounding rock sample is formed in the side plate; the piece-separating assembled steel die is formed by enclosing a plurality of equally-separated arc-shaped matrixes, and the arc-shaped matrixes are detachably connected with a top plate of the surrounding rock sample fixing box; the embedded tie bars are positioned on the central shaft of the slicing and assembling steel die, and the bottom ends of the embedded tie bars are positioned at the centers of the round holes and are contacted with the surrounding rock sample in the surrounding rock sample fixing box; the steel mould is assembled to the burst to many pre-buried lacing wire dead levers evenly setting, and the top can be dismantled with pre-buried lacing wire and be connected, and the bottom can be dismantled with the roof of the fixed box of country rock sample and be connected.
Further, a plurality of bolts I used for fixing the surrounding rock sample at the round hole are arranged on the bottom plate and the side plate of the surrounding rock sample fixing box in a penetrating mode through threads.
Furthermore, a plurality of connecting columns are arranged on a top plate of the surrounding rock sample fixing box, uniformly surround the round holes, and are provided with horizontal holes I; the arc-shaped template is provided with a connecting piece, the inner wall of the connecting piece is matched with the outer wall of the connecting column, and the connecting piece is provided with a horizontal hole II matched with the horizontal hole I; the connecting pieces of two adjacent arc-shaped matrixes are enclosed outside the connecting column, the horizontal holes II of the two connecting pieces outside the connecting column are respectively positioned at two ends of the horizontal hole I, and the bolt II penetrates through the horizontal hole I and the horizontal hole II.
Furthermore, a vertical hole I is formed in the connecting column; the bottom end of the embedded lacing bar fixing rod is a lower connecting end matched with the vertical hole I, and a horizontal hole III matched with the horizontal hole I is formed in the lower connecting end; the lower connecting end of the embedded lacing wire fixing rod is inserted into the vertical hole I, the horizontal hole III is aligned with the horizontal hole I, and the bolt II penetrates through the horizontal hole I, the horizontal hole II and the horizontal hole III.
Furthermore, a connecting block is arranged on the embedded lacing bar, and a horizontal hole VI corresponding to the embedded lacing bar fixing rod and a vertical hole II penetrating through the horizontal hole VI are arranged on the connecting block; the embedded tie bar fixing rod is a bent rod, the top end of the embedded tie bar fixing rod is an upper connecting end matched with the horizontal hole VI, and a vertical hole III matched with the vertical hole II is formed in the upper connecting end; the upper connecting end of the embedded tie bar fixing rod is inserted into the horizontal hole VI, the vertical hole III is aligned with the vertical hole II, and the bolt III penetrates through the vertical hole II and the vertical hole III.
Furthermore, the top end of the embedded lacing wire is provided with a loading ring, and the bottom end of the embedded lacing wire is provided with a loading plate used for transmitting a load to the sprayed concrete.
Further, the fixed box of country rock sample is square box body, and the quantity of arc die and pre-buried lacing wire dead lever is 3.
Further, the test apparatus is a steel product.
The utility model discloses following beneficial effect has:
the utility model discloses when detecting shotcrete and country rock bonding strength, avoided the destruction of strutting in the tunnel, protected its wholeness. Under the prerequisite of not destroying and strut, the utility model discloses can be to same country rock condition, make large batch test piece to avoid the contingency of testing data. Meanwhile, under the condition that a large number of test pieces exist, a systematic and comprehensive and deep test can be designed according to the bonding strength, the bonding mechanism of the sprayed concrete and the surrounding rock is disclosed, and relevant factors influencing the bonding strength are researched. Furthermore, the utility model discloses during the loading, use the lacing wire buried underground in advance as the medium of applying the load, when the experiment, after arriving predetermined detection age, need not to install additional the device of applying the load to the concrete sample, consequently can not produce the disturbance to the concrete sample. The test device is simple and convenient to assemble, has small influence on construction, does not need to damage the constructed support, does not need to repair the support at the test point at the later stage, and greatly saves time and cost.
Drawings
FIG. 1 is a schematic structural diagram of a test device for detecting the bonding strength between shotcrete and surrounding rock;
FIG. 2 is a schematic structural diagram of a surrounding rock sample fixing box;
FIG. 3 is a schematic structural diagram of an arc-shaped die;
FIG. 4 is a schematic structural view of a pre-buried tie bar fixing rod;
FIG. 5 is a schematic structural view of a pre-buried tie bar;
FIG. 6 is a diagram showing the operation of the test apparatus shown in FIG. 1.
In the figure: 1-a surrounding rock sample fixing box; 1.1-round hole; 1.2-side holes; 1.3-connecting column; 1.4-horizontal hole I; 1.5-vertical hole I; 2-assembling the steel die in a slicing manner; 2.1-arc-shaped matrix; 2.2-connecting sheet; 2.3-horizontal hole II; 3-embedding a lacing wire fixing rod; 3.1-horizontal hole III; 3.2-vertical hole III; 4-pre-burying a lacing wire; 4.1-connecting block; 4.2-horizontal hole VI; 4.3-vertical hole II; 4.4-load ring; 4.5-load plate; 5-bolt I; 6-bolt II; 7-bolt III; 101-surrounding rock sample; 102-shotcrete.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment provides a test device for detecting the bonding strength between sprayed concrete and surrounding rock, which comprises a surrounding rock sample fixing box 1, a cylindrical partitioned assembled steel die 2, an embedded lacing wire fixing rod 3 and an embedded lacing wire 4; the surrounding rock sample fixing box 1 comprises a top plate, a bottom plate and a side plate for connecting the top plate and the bottom plate; a circular hole 1.1 matched with the slicing and assembling steel die 2 is arranged on the top plate; a side hole 1.2 for taking and placing a surrounding rock sample 101 is formed in the side plate; the piece-by-piece assembling steel die 2 is formed by enclosing a plurality of equally-divided arc-shaped matrixes 2.1, and the arc-shaped matrixes 2.1 are detachably connected with a top plate of the surrounding rock sample fixing box 1; the embedded tie bars 4 are positioned on the central shaft of the slicing and assembling steel die 2, and the bottom ends of the embedded tie bars are positioned at the center of the round holes 1.1 and are contacted with the surrounding rock sample 101 in the surrounding rock sample fixing box 1; the steel mould 2 is assembled to the burst to even setting of many pre-buried lacing wire dead levers 3, and the top can be dismantled with pre-buried lacing wire 4 and be connected, and the bottom can be dismantled with the roof of the fixed box of country rock sample 1 and be connected.
Further, the bottom plate of the fixed box of country rock sample 1 and the curb plate on the screw thread wear to be equipped with many and be used for fixing the bolt I5 in round hole 1.1 department with the country rock sample.
Furthermore, a plurality of connecting columns 1.3 are arranged on a top plate of the surrounding rock sample fixing box 1, the connecting columns 1.3 uniformly surround the round holes 1.1, and horizontal holes I1.4 are formed in the connecting columns 1.3; a connecting piece 2.2 is arranged on the arc-shaped template 2.1, the inner wall of the connecting piece 2.2 is matched with the outer wall of the connecting column 1.3, and a horizontal hole II 2.3 matched with the horizontal hole I1.4 is arranged on the connecting piece 2.2; the connecting pieces 2.2 of two adjacent arc-shaped matrixes 2.1 are enclosed outside the connecting column 1.3, the horizontal holes II 2.3 of the two connecting pieces 2.2 outside the connecting column 1.3 are respectively positioned at two ends of the horizontal hole I1.3, and the bolt II 6 penetrates through the horizontal hole I1.4 and the horizontal hole II 2.3.
Furthermore, a vertical hole I1.5 is formed in the connecting column 1.3; the bottom end of the embedded lacing bar fixing rod 3 is a lower connecting end matched with the vertical hole I1.5, and a horizontal hole III 3.1 matched with the horizontal hole I1.4 is formed in the lower connecting end; the lower connecting end of the embedded lacing wire fixing rod 3 is inserted in the vertical hole I1.5, the horizontal hole III 3.1 is aligned with the horizontal hole I1.4, and the bolt II 6 penetrates through the horizontal hole I1.4, the horizontal hole II 2.3 and the horizontal hole III 3.1. Through the cooperation of spliced pole 1.3, connection piece 2.2, lower link, bolt II 6 and above-mentioned horizontal hole and vertical hole, can realize simultaneously that the burst is assembled steel mould 2, pre-buried lacing wire dead lever 3 and the fixed box's of country rock dismantlement of being connected, design benefit, easy dismounting.
Furthermore, a connecting block 4.1 is arranged on the embedded lacing bar 4, and a horizontal hole VI 4.2 corresponding to the embedded lacing bar fixing rod 3 and a vertical hole II 4.3 penetrating through the horizontal hole VI 4.2 are arranged on the connecting block 4.1; the embedded lacing bar fixing rod 3 is a bent rod, the top end of the embedded lacing bar fixing rod is an upper connecting end matched with the horizontal hole VI 4.2, and a vertical hole III 3.2 matched with the vertical hole II 4.3 is arranged on the upper connecting end; the last link of pre-buried lacing wire dead lever 3 is inserted and is established in horizontal hole VI 4.2, and vertical hole III 3.2 aligns with vertical hole II 4.3, and bolt III 7 passes vertical hole II 4.3 and vertical hole III 3.2, realizes pre-buried lacing wire dead lever 3 and pre-buried lacing wire 4's detachable connection.
Further, the diameter of the upper connecting end and the lower connecting end of the embedded lacing wire fixing rod 3 is larger than that of the middle section.
Further, the top end of the embedded lacing wire 4 is provided with a loading ring 4.4, the sprayed concrete 102 is loaded by adopting an iron hook, and the iron hook is hinged with the loading ring 4.4, so that the load eccentricity is avoided. The bottom end of the embedded lacing wire 4 is provided with a loading plate 4.5 used for transmitting load to the sprayed concrete 102.
Further, the fixed box of country rock sample 1 is square box body, and the quantity of arc diaphragm 2.1 and pre-buried lacing wire dead lever 3 is 3.
Further, the test apparatus is a steel product.
The method of use of the test device is as follows:
s1, selecting the corresponding surrounding rock sample 101 in the area needing to be detected, and preprocessing the surrounding rock sample 101, wherein the preprocessing comprises size processing and surface processing:
size treatment: the surrounding rock sample 101 can be placed in the surrounding rock sample fixing box 1 and is larger than the size of a round hole 1.1 in the surrounding rock sample fixing box 1, and preferably, the surrounding rock sample 101 can also freely move in the surrounding rock sample fixing box 1;
surface treatment: after the surrounding rock sample 101 is placed in the surrounding rock sample fixing box 1, performing surface treatment on one surface of the circular hole, so that the flat and rough conditions of the surrounding rock sample are fitted with the actual conditions of the surrounding rock;
after the treatment is finished, the surrounding rock sample 101 is placed in the surrounding rock sample fixing box 1, the bolt I5 is adjusted, so that the position of the surrounding rock sample 101 in the surrounding rock sample fixing box 1 is fixed, the surrounding rock sample 101 is tightly attached to the lower surface of the top plate, the circular hole 1.1 is completely covered, and the edge of the circular hole 1.1 is attached to the greatest extent;
s2, mounting the slicing and assembling steel die 2, enclosing the connecting pieces 2.2 of two adjacent arc-shaped templates 2.1 outside the connecting column 1.3, and respectively positioning the horizontal holes II 2.3 of the two connecting pieces 2.2 outside the connecting column 1.3 at two ends of the horizontal hole I1.3; installing an embedded tie bar fixing rod 3 and an embedded tie bar 4, inserting a lower connecting end of the embedded tie bar fixing rod 3 into a vertical hole I1.5, aligning a horizontal hole III 3.1 with the horizontal hole I1.4, penetrating a bolt II 6 through the horizontal hole I1.4, a horizontal hole II 2.3 and a horizontal hole III 3.1, inserting an upper connecting end of the embedded tie bar fixing rod 3 into a horizontal hole VI 4.2, aligning a vertical hole III 3.2 with a vertical hole II 4.3, and penetrating a bolt III 7 through the vertical hole II 4.3 and the vertical hole III 3.2;
s3, after the assembly is finished, placing the test device at a corner of a wall or fixing the test device on the wall at an included angle of 80 degrees with the horizontal direction, wherein the side with the side hole 1.2 faces downwards;
s4, spraying concrete in the split assembling steel die 2, and ensuring that the surrounding rock sample 101 fixed at the bottom of the split assembling steel die 2 is in good contact with the sprayed concrete 102 received by the split assembling steel die 2 during spraying, and the embedded tie bars 4 are always kept in embedded positions and postures in the spraying process;
and S5, maintaining the test piece to the set age for drawing test.
Further, tunnel hole slag matched with the surrounding rock condition of the detection area is adopted to simulate the surrounding rock sample 101.
To sum up, the utility model discloses a neotype test device detects shotcrete 102 and each age bonding strength of country rock, need not to do to execute to strut and produce under the condition of disturbance, reaction concrete bonding strength. Compared with the existing detection method for reserving a test specimen in the support, the test device can reduce the influence on tunnel construction, is more efficient, convenient and accurate in detection, and does not influence the integrity of the constructed support. The utility model discloses under the same country rock condition, big batch bonding strength test sample can be provided to can be scientific more, systematic research spray concrete and the bonding mechanism and the bonding strength influence factor of country rock. And the utility model discloses pre-buried lacing wire in the shotcrete is as the carrier that receives when the loading. Therefore, disturbance to the test piece when the loading medium is installed is avoided.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (8)
1. A test device for detecting the bonding strength between sprayed concrete and surrounding rock is characterized by comprising a surrounding rock sample fixing box, a cylindrical partitioned assembled steel die, a pre-embedded lacing wire fixing rod and a pre-embedded lacing wire;
the surrounding rock sample fixing box comprises a top plate, a bottom plate and a side plate for connecting the top plate and the bottom plate;
the top plate is provided with a round hole matched with the slicing and assembling steel die;
a side hole for taking and placing a surrounding rock sample is formed in the side plate;
the partitioned assembled steel die is formed by enclosing a plurality of equally partitioned arc-shaped matrixes, and the arc-shaped matrixes are detachably connected with a top plate of the surrounding rock sample fixing box;
the embedded tie bars are positioned on the central shaft of the slicing and assembling steel die, and the bottom ends of the embedded tie bars are positioned at the centers of the round holes and are contacted with the surrounding rock sample in the surrounding rock sample fixing box;
the steel mould is assembled to the burst to many pre-buried lacing wire dead levers evenly setting, and the top can be dismantled with pre-buried lacing wire and be connected, and the bottom can be dismantled with the roof of the fixed box of country rock sample and be connected.
2. The test device for detecting the bonding strength between the shotcrete and the surrounding rock according to claim 1, wherein a plurality of bolts I for fixing the surrounding rock sample at the round hole are arranged on the bottom plate and the side plate of the surrounding rock sample fixing box in a threaded manner.
3. The test device for detecting the bonding strength between the shotcrete and the surrounding rock according to claim 2, wherein a plurality of connecting columns are arranged on a top plate of the surrounding rock sample fixing box, uniformly surround round holes, and are provided with horizontal holes I;
the arc-shaped template is provided with a connecting piece, the inner wall of the connecting piece is matched with the outer wall of the connecting column, and the connecting piece is provided with a horizontal hole II matched with the horizontal hole I;
the connecting pieces of two adjacent arc-shaped matrixes are enclosed outside the connecting column, the horizontal holes II of the two connecting pieces outside the connecting column are respectively positioned at two ends of the horizontal hole I, and the bolt II penetrates through the horizontal hole I and the horizontal hole II.
4. The test device for detecting the bonding strength between the shotcrete and the surrounding rock according to claim 3, wherein the connecting column is provided with a vertical hole I;
the bottom end of the embedded lacing bar fixing rod is a lower connecting end matched with the vertical hole I, and a horizontal hole III matched with the horizontal hole I is formed in the lower connecting end;
the lower connecting end of the embedded lacing wire fixing rod is inserted into the vertical hole I, the horizontal hole III is aligned with the horizontal hole I, and the bolt II penetrates through the horizontal hole I, the horizontal hole II and the horizontal hole III.
5. The test device for detecting the bonding strength between the sprayed concrete and the surrounding rock as claimed in claim 4, wherein the embedded tie bar is provided with a connecting block, and the connecting block is provided with a horizontal hole VI corresponding to the embedded tie bar fixing rod and a vertical hole II penetrating through the horizontal hole VI;
the embedded tie bar fixing rod is a bent rod, the top end of the embedded tie bar fixing rod is an upper connecting end matched with the horizontal hole VI, and a vertical hole III matched with the vertical hole II is formed in the upper connecting end;
the upper connecting end of the embedded tie bar fixing rod is inserted into the horizontal hole VI, the vertical hole III is aligned with the vertical hole II, and the bolt III penetrates through the vertical hole II and the vertical hole III.
6. The test device for detecting the bonding strength between the shotcrete and the surrounding rock according to claim 5, wherein a loading ring is arranged at the top end of the embedded tie bar, and a loading plate for transferring a load to the shotcrete is arranged at the bottom end of the embedded tie bar.
7. The test device for detecting the bonding strength between the shotcrete and the surrounding rock according to claim 6, wherein the surrounding rock sample fixing box is a square box body, and the number of the arc-shaped mold pieces and the number of the pre-embedded tie bar fixing rods are 3.
8. The test device for detecting the bonding strength between the shotcrete and the surrounding rock according to claim 7, wherein the test device is a steel product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120749851.1U CN214539193U (en) | 2021-04-13 | 2021-04-13 | Test device for detecting bonding strength between sprayed concrete and surrounding rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120749851.1U CN214539193U (en) | 2021-04-13 | 2021-04-13 | Test device for detecting bonding strength between sprayed concrete and surrounding rock |
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| Publication Number | Publication Date |
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| CN214539193U true CN214539193U (en) | 2021-10-29 |
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| CN202120749851.1U Active CN214539193U (en) | 2021-04-13 | 2021-04-13 | Test device for detecting bonding strength between sprayed concrete and surrounding rock |
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- 2021-04-13 CN CN202120749851.1U patent/CN214539193U/en active Active
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