CN111721564A - Close-range explosion test platform and method for sunken beam-slab member - Google Patents
Close-range explosion test platform and method for sunken beam-slab member Download PDFInfo
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- CN111721564A CN111721564A CN202010540858.2A CN202010540858A CN111721564A CN 111721564 A CN111721564 A CN 111721564A CN 202010540858 A CN202010540858 A CN 202010540858A CN 111721564 A CN111721564 A CN 111721564A
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- 238000004880 explosion Methods 0.000 title claims abstract description 95
- 238000012360 testing method Methods 0.000 title claims abstract description 38
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- 241000269793 Cryothenia peninsulae Species 0.000 claims abstract description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000002360 explosive Substances 0.000 claims description 11
- 238000003825 pressing Methods 0.000 claims description 10
- 238000005422 blasting Methods 0.000 claims description 3
- 238000005474 detonation Methods 0.000 claims description 3
- 229910000746 Structural steel Inorganic materials 0.000 claims description 2
- 239000011324 bead Substances 0.000 claims description 2
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- 230000006378 damage Effects 0.000 abstract description 15
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- 239000002689 soil Substances 0.000 description 2
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- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 235000017899 Spathodea campanulata Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
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Abstract
The invention relates to the technical field of engineering component testing, in particular to a close-range explosion test platform of a sinking beam-slab component and a test method thereof, wherein the close-range explosion test platform comprises a sinking explosion pit, and a pithead is arranged above the sinking explosion pit; the protective covering plate is covered above the pithead and is provided with an impact action hole, a plurality of pressure sensors are arranged on the protective covering plate, and the pressure sensors are arranged at different positions of the protective covering plate in the horizontal direction; a beam plate member provided at a lower end of the impact acting hole; the supporting device is arranged in the sunken explosion pit and is provided with a plurality of displacement meters; and the dynamic data acquisition instrument is in signal connection with the pressure sensor and the displacement meter. The invention can avoid the damage of the detecting instrument in the sinking type explosion pit caused by the reflection and diffraction of the explosion shock wave, obtain the related data for analysis and calculation, and obtain a more accurate explosion load model for the anti-explosion design of the engineering structure.
Description
Technical Field
The invention relates to the technical field of engineering component testing, in particular to a close-range explosion test platform of a sunken beam-slab component and a test method thereof.
Background
The beam-slab structure is the most common basic component in civil engineering, and the safety against blast has attracted great attention from countries all over the world. The existing beam-slab member antiknock test device is exposed on the earth surface, and the reflection and diffraction of the explosion shock wave can cause the stripping or damage of a test instrument, so that effective test data cannot be captured, and great test errors are caused.
On the other hand, practice shows that: even a small equivalent of a close-range explosive equivalent can cause severe damage to the engineering component, the damage mechanism involves the coupling effect of bulk shear and localized material failure, and the existing theory is difficult to distinguish the damage mode and the damage degree. The close-range explosive load is influenced by the shock wave fireball, explosive products and the shock wave density, and the explosive load distribution on the bearing surface of the component is not typicallyand uniformly distributed, so that the determination of the close-range explosive load distribution form has very important significance for the calculation of the anti-explosion design of the engineering structure. Although many scholars (such as Kingery & Bulmash, domestic Chenli, Zhao Yuan sea, etc.) at home and abroad have made a lot of researches on the close-range explosion load model in recent years, and have proposed corresponding load models. However, due to the fact that the factors involved in close-range explosion are many, the explosion load model still has a large error, and the calculation result based on the existing explosion load model is mainly far greater than the actual situation.
Disclosure of Invention
The invention aims to provide a close-range explosion test platform of a sunken beam-slab member and a test method thereof, which are beneficial to realizing the reliable work of a test instrument in an explosion shock wave environment, acquiring reliable test data and having guiding significance on the anti-explosion design of an engineering beam-slab structure.
In order to achieve the above object, the present invention provides a short-distance explosion test platform for a sunk beam-slab member, comprising:
the upper part of the sinking type blasting pit is provided with a pit opening;
the protective covering plate is covered above the pithead and is provided with an impact action hole, a plurality of pressure sensors are arranged on the protective covering plate, and the pressure sensors are arranged at different positions of the protective covering plate in the horizontal direction;
a beam plate member provided at a lower end of the impact application hole;
the supporting device is arranged in the sunken explosion pit and used for supporting the beam plate member to be attached to the lower end of the impact acting hole, and a plurality of displacement meters used for detecting deflection of the beam plate member at different positions are mounted on the supporting device;
and the dynamic data acquisition instrument is in signal connection with the pressure sensor and the displacement meter.
Optionally, the edge of the sunken explosion pit is surrounded by a protective side wall.
Optionally, an angle steel corner protector covers the inner side edge of the upper end of the protective side wall.
Optionally, a steel anchor rod is embedded in the protective side wall, the upper end of the steel anchor rod is exposed out of the protective side wall, a shroud plate pressing strip is arranged on the protective shroud plate, and two ends of the shroud plate pressing strip are connected with the steel anchor rod.
Optionally, the protective shroud plate is provided with a mounting hole, and the pressure sensor is arranged in the mounting hole.
Optionally, the number of the supporting devices is two, the supporting devices include buttresses and supports, and the supports are fixed on the buttresses.
Optionally, the support includes base and roller, the constant head tank has been seted up to the base, the roller level inlays to be located the constant head tank, the beam slab component place in on the roller.
Optionally, the supporting device further comprises a cross beam, the buttresses of the two groups of supporting devices are connected through the cross beam, and the cross beam is provided with the displacement meter.
Optionally, the impact acting hole is a rectangular hole.
Based on the above purpose, the invention also provides a close-range explosion test method for the sinking beam-slab member, which is characterized by comprising the following steps:
a close range explosion test platform for arranging the sinking beam-slab component;
suspending an explosive above the impact action hole, and detonating the explosive through a detonation control device;
the dynamic data acquisition instrument acquires the conditions of close-range explosion impact overpressure and action time changing along with the explosion proportion distance through a plurality of pressure sensors, and simultaneously records the deflection of the beam-slab member at different positions through a displacement meter.
The embodiment of the invention has the following technical effects:
the invention sets the sinking explosion pit, sets the beam plate component in the sinking explosion pit, and the beam plate component is supported by the supporting device to be close to the ground level, at the same time, sets the protective covering plate on the beam plate component, the protective covering plate is covered on the pit opening, avoids the damage of the detecting instrument in the sinking explosion pit caused by the reflection and diffraction of the explosion shock wave, thereby ensuring the stable capture of the test data, and the protective covering plate is provided with the impact action hole in order not to influence the beam plate component to bear the impact of the explosion, so that the shock wave generated by the explosion can directly act on the upper surface of the beam plate component, and provides the direct and reliable test data through the dynamic response and the damage form of the beam plate component under the impact wave action, so as to complete the test;
in addition, in order to realize the detection of the distribution condition of the close-range explosion load, pressure sensors are arranged at different positions on the protective covering plate and are used for detecting the conditions of close-range explosion impact overpressure and the change of action time along with the explosion proportion distance;
and in order to obtain the dynamic response and the damage form of the beam-slab member under the action of the explosion shock wave, a displacement meter is arranged, and a dynamic data acquisition instrument is arranged to be in signal connection with the pressure sensor and the displacement meter, so that related data are obtained to be analyzed and calculated, and a more accurate explosion load model is obtained to be used for the anti-explosion design of the engineering structure.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention
FIG. 2 is a cross-sectional view in the horizontal direction of the preferred embodiment of the present invention;
FIG. 3 is a horizontal cross-sectional view of a sunken blast pit of the preferred embodiment of the present invention;
FIG. 4 is a front view of a partial structure of the preferred embodiment of the present invention;
FIG. 5 is a top view of a preferred embodiment of the blast protected panel of the present invention;
FIG. 6 is a top view of a signal line guard shroud in accordance with a preferred embodiment of the present invention;
FIG. 7 is a front view of a buttress in accordance with a preferred embodiment of the present invention;
FIG. 8 is a side view of a buttress in accordance with a preferred embodiment of the present invention;
FIG. 9 is a side view of a cradle according to a preferred embodiment of the present invention;
FIG. 10 is a front view of the cradle of the preferred embodiment of the present invention;
fig. 11 is a front view of a cross-beam of a preferred embodiment of the present invention.
Description of reference numerals:
1. the device comprises a sunken explosion pit, 11, protective side walls, 12, angle steel angle beads, 13, steel anchor rods, 14, a cable channel, 2, a protective covering plate, 21, an impact hole, 23, a shock wave protective covering plate, 24, a signal line protective covering plate, 25, a covering plate handle, 3, a pressure sensor, 4, beam-plate components, 5, a supporting device, 51, a buttress, 52, a support, 521, a base, 522, a roll shaft, 53, a beam, 6, a displacement meter, 7 and a covering plate pressing strip.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 to 11, an embodiment of the present invention provides a close-up explosion test platform for a sunk beam-slab member, including:
the sinking type blasting pit 1 is provided with a pit opening above;
the protective covering plate 2 is covered above the pithead and is provided with an impact acting hole 21, a plurality of pressure sensors 3 are arranged on the protective covering plate 2, and the pressure sensors 3 are arranged at different positions of the protective covering plate 2 in the horizontal direction;
a beam plate member 4 provided at a lower end of the impact-applying hole 21;
the supporting device 5 is arranged in the sunken explosion pit 1 and is used for supporting the beam plate member 4 to be attached to the lower end of the impact acting hole 21, and the supporting device 5 is provided with a displacement meter 6 for detecting deflection of the beam plate member 4 at different positions;
and a dynamic data acquisition instrument (not shown in the figure) which is in signal connection with the pressure sensor 3 and the displacement meter 6.
According to the invention, the sunken explosion pit 1 is arranged, the beam plate member 4 is arranged in the sunken explosion pit 1, the beam plate member 4 is supported by the supporting device 5 to be close to the ground level, meanwhile, the beam plate member 4 is provided with the protective covering plate 2, and the protective covering plate 2 is covered on the pit opening, so that the damage of a detection instrument in the sunken explosion pit 1 caused by the reflection and diffraction of explosion shock waves is avoided, the stable capture of test data is ensured, and in order not to influence the beam plate member 4 to bear the explosion impact, the protective covering plate 2 is provided with the impact action hole 21, so that the shock waves generated by explosion can directly act on the upper surface of the beam plate member 4, and the direct and reliable test data are provided through the dynamic response and the damage form of the beam plate member 4 under the impact wave action, so as to complete the test;
in addition, in order to realize the detection of the distribution condition of the close-range explosion load, pressure sensors 3 are arranged at different positions on the protective covering plate 2 and are used for detecting the conditions of close-range explosion impact overpressure and the change of action time along with the explosion proportion distance;
and in order to obtain the dynamic response and the destruction form of the beam-slab member 4 under the action of the explosion shock wave, the displacement meter 6 is arranged, and meanwhile, the dynamic data acquisition instrument is arranged to be in signal connection with the pressure sensor 3 and the displacement meter 6, so that the related data is obtained to be analyzed and calculated, and a more accurate explosion load model is obtained to be used for the anti-explosion design of the engineering structure.
Referring to fig. 1 to 4, in the embodiment, a protective side wall 11 is arranged around the edge of the sunken explosion pit 1 to improve the overall stability of the sunken explosion pit 1; specifically, when the sunken type explosion pit 1 is built, a soil pit is formed by digging, a wood mold with the thickness of 300mm is supported on the inner side of the soil pit, reinforcing steel bars are bound, RPC is stirred according to the matching ratio and the preparation process of RPC200 (the compressive strength is 140-.
Referring to fig. 5 and 6, in order to facilitate the movement of the protective sheathing panel 2, a sheathing handle 25 is provided on the protective sheathing panel 2.
Further, at the in-process of pouring, it is closely knit to utilize the vibration of concrete vibrting stick, and the air of sneaking into in the concrete of discharge makes RPC more closely knit, and cable passageway 14 is reserved to the duration, and natural curing predetermines the time can.
The reserved cable channel 14 facilitates signal connection of the dynamic data acquisition instrument wiring and the pressure sensor 3 and the displacement meter 6, and wiring in concrete avoids damage of the cable under explosion shock waves, so that reliable transmission of data is guaranteed.
Referring to fig. 1, 5 and 6, in addition, the protection shroud plate 2 in this embodiment includes a shock wave protection shroud plate 23 and a signal line protection shroud plate 24, and the horizontal cross section of the sunken type explosion pit 1 in this embodiment is an L-shaped, and can be divided into a load action area and a cable storage area, so that the structure integrity is good, the toughness and the strength are high, the arrangement of instrument equipment is facilitated, the reuse is realized, wherein the shock wave protection shroud plate 23 covers the load action area, and the signal line protection shroud plate 24 covers the cable storage area.
Referring to fig. 2, further, in order to protect the edge of the protective side wall 11 formed by concrete from being cracked after being impacted by an explosion, an angle iron corner 12 is covered on the inner edge of the upper end of the protective side wall 11 in the embodiment, so that the service life of the protective side wall 11 can be effectively prolonged and the protective side wall can be reused.
Referring to fig. 4, preferably, a steel anchor rod 13 is embedded in the protective side wall 11 of the present embodiment, the upper end of the steel anchor rod 13 is exposed out of the protective side wall 11, a shroud plate pressing strip 7 is arranged on the protective shroud plate 2, and two ends of the shroud plate pressing strip 7 are connected to the steel anchor rod 13, so that the protective shroud plate 2 is pressed by the shroud plate pressing strip 7, the protective shroud plate 2 is prevented from being flipped over by an explosion shock wave, and the detection equipment in the pit is prevented from being damaged, wherein the shroud plate pressing strip 7 is an angle steel, and the shroud plate pressing strip 7 is connected to the steel anchor rod 13 through a high-strength.
In order to protect the pressure sensor 3 and prevent the pressure sensor 3 from moving or being damaged under the action of the explosion shock wave, referring to fig. 5, the protective shroud plate 2 of the embodiment is provided with a mounting hole, the pressure sensor 3 is arranged in the mounting hole, and the pressure sensor 3 is connected with the protective shroud plate 2 through a high-strength bolt.
Preferably, referring to fig. 1, in order to provide stable support to the beam plate member 4, the supporting means 5 are provided in two groups, and the supporting means 5 includes a buttress 51 and a seat 52, and the seat 52 is fixed to the buttress 51 by bolts.
Further, referring to fig. 9 and 10, the support 52 includes a base 521 and a roller 522, the base 521 is provided with a positioning groove, the roller 522 is horizontally embedded in the positioning groove, and the roller 522 of the two sets of supporting devices 5 is attached to the lower bottom surface of the beam plate member 4 to form a stable support.
Referring to fig. 1, the supporting device 5 further includes a cross beam 53, the buttresses 51 of the two groups of supporting devices 5 are connected through the cross beam 53, so that the reliability of the two groups of supporting devices 5 for supporting the beam-slab member 4 is further stabilized, specifically, the cross beam 53 is made of angle steel, the cross beam 53 is connected with the buttresses 51 through high-strength bolts, in addition, the cross beam 53 fixes the displacement meters 6 through the high-strength bolts, and the displacement meters 6 in a plurality of numbers are arranged at the same distance intervals along the length direction of the cross beam 53, in this embodiment, the displacement meters 6 are slide wire resistance type displacement meters 6.
Specifically, the impact acting hole 21 in this embodiment is a rectangular hole, and the pressure sensors 3 are uniformly arranged along the edge of the rectangular hole, so as to obtain the load distribution of the close-range explosion at different positions of the protective cover plate 2.
Based on the above close-range explosion test method for the sinking beam-slab member, the embodiment provides a close-range explosion test method for the sinking beam-slab member, which includes the following steps:
a close range explosion test platform provided with the sinking beam-slab component 4;
suspending the explosive above the impact action hole 21, and detonating the explosive through a detonation control device;
the conditions of close-range explosion impact overpressure and action time changing along with the explosion proportion distance are obtained through a plurality of pressure sensors 3, and meanwhile, the deflection of the beam-slab member 4 at different positions is recorded through a displacement meter 6.
Therefore, the beam-slab member 4 can reliably acquire corresponding test data when receiving the explosion shock wave so as to obtain a corresponding load model through calculation and analysis, and the method has very important guiding significance on the anti-explosion design of the engineering structure.
In some embodiments, the collected near-distance explosion shock wave overpressure can be compared with the calculation result of the ConWep model, and a correction calculation formula related to the explosion proportion distance and the TNT charge shape is provided, so that a more accurate load model is obtained; among them, ConWep model: p ═ pi×(1+cosθ-2cos2θ)+pr×cos2Theta, wherein p isiAnd prIncident overpressure and reflected overpressure respectively; θ is the angle of incidence.
In conclusion, the invention can avoid the damage of the detection instrument in the sinking type explosion pit 1 caused by the reflection and diffraction of the explosion shock wave, thereby ensuring the stable capture of the test data, enabling the shock wave generated by the explosion to directly act on the upper surface of the beam plate member 4, and providing direct and reliable test data through the dynamic response and the damage form of the beam plate member 4 under the action of the shock wave so as to complete the test; in addition, the situation of close-range explosion load distribution is detected, and the dynamic response and the damage form of the beam plate member 4 under the action of the explosion shock wave can be obtained, so that the related data is obtained for analysis and calculation, and a more accurate explosion load model is obtained for the anti-explosion design of the engineering structure.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A close range explosion test platform of formula of sinking beam slab component which characterized in that includes:
the upper part of the sinking type blasting pit is provided with a pit opening;
the protective covering plate is covered above the pithead and is provided with an impact action hole, a plurality of pressure sensors are arranged on the protective covering plate, and the pressure sensors are arranged at different positions of the protective covering plate in the horizontal direction;
a beam plate member provided at a lower end of the impact application hole;
the supporting device is arranged in the sunken explosion pit and used for supporting the beam plate member to be attached to the lower end of the impact acting hole, and a plurality of displacement meters used for detecting deflection of the beam plate member at different positions are mounted on the supporting device;
and the dynamic data acquisition instrument is in signal connection with the pressure sensor and the displacement meter.
2. The short-distance explosion test platform for the sunk beam-slab components as claimed in claim 1, wherein the edge of the sunk explosion pit is surrounded by a protective side wall.
3. The close-up explosion testing platform of a submerged beam and slab structure as claimed in claim 2, wherein the inner side edges of the upper ends of the protective side walls are covered with angle iron angle beads.
4. The close-range explosion test platform of the sunken beam-slab member in claim 2 or 3, wherein a steel anchor rod is embedded in the protective side wall, the upper end of the steel anchor rod is exposed out of the protective side wall, a shroud plate pressing strip is arranged on the protective shroud plate, and two ends of the shroud plate pressing strip are connected with the steel anchor rod.
5. The close-range explosion test platform for the sunk beam-slab components according to claim 1, wherein the protective shroud is provided with a mounting hole, and the pressure sensor is arranged in the mounting hole.
6. The close-range explosion test platform for the sunk beam-slab structure as claimed in claim 1, wherein the number of the supporting devices is two, the supporting devices comprise buttresses and supports, and the supports are fixed on the buttresses.
7. The close-range explosion test platform for the sunken beam-slab component of claim 6, wherein the support comprises a base and a roller, the base is provided with a positioning groove, the roller is horizontally embedded in the positioning groove, and the beam-slab component is placed on the roller.
8. The close-range explosion test platform of a sunken beam-slab component as claimed in claim 6 or 7, wherein the supporting device further comprises a cross beam, the buttresses of the two groups of supporting devices are connected through the cross beam, and the cross beam is provided with the displacement meter.
9. The submersible beam and slab member close-proximity explosion test platform of claim 1, wherein the impact-application hole is a rectangular hole.
10. A close range explosion test method of a sinking type beam-slab member is characterized by comprising the following steps:
a close-range explosion test platform for providing a sunken beam slab member as defined in any one of claims 1 to 9;
suspending an explosive above the impact action hole, and detonating the explosive through a detonation control device;
the dynamic data acquisition instrument acquires the conditions of close-range explosion impact overpressure and action time changing along with the explosion proportion distance through a plurality of pressure sensors, and simultaneously records the deflection of the beam-slab member at different positions through a displacement meter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010540858.2A CN111721564A (en) | 2020-06-15 | 2020-06-15 | Close-range explosion test platform and method for sunken beam-slab member |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010540858.2A CN111721564A (en) | 2020-06-15 | 2020-06-15 | Close-range explosion test platform and method for sunken beam-slab member |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001987A (en) * | 2021-10-12 | 2022-02-01 | 东南大学 | Vertical observable structural column anti-explosion test device and test method |
| CN114018731A (en) * | 2021-10-15 | 2022-02-08 | 中山大学 | Simulation test method for explosion effect in saturated sandy soil |
| CN114487339A (en) * | 2022-01-10 | 2022-05-13 | 东南大学 | Test device and test method for simulating structure to be exploded by gas or dust |
| CN114688433A (en) * | 2022-03-22 | 2022-07-01 | 北京理工大学 | Sensor protection device and sensor assembly method adopting same |
| CN115575264A (en) * | 2022-08-03 | 2023-01-06 | 南京理工大学 | Device for simulating explosion wave in long-term operation and test method |
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2020
- 2020-06-15 CN CN202010540858.2A patent/CN111721564A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114001987A (en) * | 2021-10-12 | 2022-02-01 | 东南大学 | Vertical observable structural column anti-explosion test device and test method |
| CN114018731A (en) * | 2021-10-15 | 2022-02-08 | 中山大学 | Simulation test method for explosion effect in saturated sandy soil |
| CN114018731B (en) * | 2021-10-15 | 2024-02-02 | 中山大学 | Simulation test method for explosion effect in saturated sand |
| CN114487339A (en) * | 2022-01-10 | 2022-05-13 | 东南大学 | Test device and test method for simulating structure to be exploded by gas or dust |
| CN114487339B (en) * | 2022-01-10 | 2023-12-26 | 东南大学 | Test device and test method for simulating gas or dust explosion of structure |
| CN114688433A (en) * | 2022-03-22 | 2022-07-01 | 北京理工大学 | Sensor protection device and sensor assembly method adopting same |
| CN114688433B (en) * | 2022-03-22 | 2022-11-25 | 北京理工大学 | Sensor protection device and sensor assembly method adopting same |
| CN115575264A (en) * | 2022-08-03 | 2023-01-06 | 南京理工大学 | Device for simulating explosion wave in long-term operation and test method |
| CN115575264B (en) * | 2022-08-03 | 2023-08-08 | 南京理工大学 | Long-duration blast wave simulation device and test method |
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