Dynamic strain characteristics testing method and device for building structures under blasting

Abstract

The present invention relates to the technical field of blasting vibration detection, and specifically to a dynamic strain characteristic testing device for a building structure under blasting, comprising a control panel, one side of the control panel is fixedly connected to a support plate, a pressure plate and a spring sheet 1 are arranged in the support plate, one end of the pressure plate contacts with the spring sheet 1, the other end of the pressure plate extends to the outside of the support plate, one side of the pressure plate is provided with a spring sheet 2, and the other side of the pressure plate contacts with a piston column. The present invention also discloses a dynamic strain characteristic testing method for a building structure under blasting. The structural design of the present invention effectively improves the efficiency of the research work on the dynamic response characteristic technology of the building structure under the blasting of the underpass tunnel, realizes the dynamic strain characteristic testing of the building structure under the blasting vibration, and has stable and powerful functions.

Description

Technical Field

[0001] The invention relates to the technical field of blasting vibration detection, and in particular to a method and a device for testing dynamic strain characteristics of a building structure under blasting action. Background Art

[0002] In the existing technical research work on the dynamic response characteristics of building structures under the action of blasting in tunnels, the influence of blasting vibration on the building structure in the tunnel is involved. A vibration energy detection device can be set on the supporting structure of the tunnel.

[0003] If we can invent a dynamic strain characteristic testing device for building structures that can achieve stable and efficient building vibration intensity detection, the problem can be solved. To this end, we provide a method and device for dynamic strain characteristic testing of building structures under blasting vibration. Summary of the invention

[0004] The purpose of the present invention is to provide a method and device for testing the dynamic strain characteristics of a building structure under blasting, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dynamic strain characteristic testing device of a building structure under blasting, comprising a control plate, one side of the control plate is fixedly connected to a support plate, a pressure plate and a spring sheet 1 are arranged in the support plate, one end of the pressure plate contacts with the spring sheet 1, and the other end of the pressure plate extends to the outside of the support plate, one side of the pressure plate is provided with a spring sheet 2, and the other side of the pressure plate contacts with a piston column, one end of the piston column contacts with a spring 1, the piston column and the spring 1 are arranged in a cylindrical groove opened on the support plate, one side of the support plate is fixedly connected to a hose, one end of the hose extends to the cylindrical groove on the support plate, a vertical plate is arranged at the lower end of the control plate, a guide rod is connected between the control plate and the vertical plate, and the guide rod is connected between the control plate and the vertical plate. The upper end of the rod is fixedly connected to the control plate, and the lower end of the guide rod extends into the vertical plate. A spring 2 is sleeved on the guide rod. A U-shaped tube is fixedly connected to one side of the vertical plate, and the other end of the hose extends into the U-shaped tube, and an air valve is respectively arranged at the upper and lower ends of the docking position of the hose and the U-shaped tube. An interception valve is connected to the bottom of the U-shaped tube, and the interception valve comprises an outer tube, a pull rod, a sealing ball, an interception disk and a spring 3. A pull rod is movably sleeved on the middle part of the outer tube, and the outer tube passes through the shell of the U-shaped tube. A sealing ball is fixedly connected to the upper end of the pull rod, and the sealing ball is arranged in the U-shaped tube. An interception disk is fixedly connected to the lower end of the pull rod. A spring 3 is arranged between the outer tube and the interception disk, and the spring 3 is sleeved on the pull rod. An L-shaped tube cavity is opened on the vertical plate, and the lower end of the guide rod extends into the L-shaped tube cavity.

[0006] Preferably, the air valve includes a sealing cylinder, a control ball, a spring four and a breathable plate, the upper end of the spring four contacts the control ball, the lower end of the spring four contacts the breathable plate, the upper end of the control ball is provided with a sealing cylinder, and the sealing cylinder and the breathable plate are fixed on the inner wall of the U-shaped tube.

[0007] Preferably, the sealing cylinder is in the shape of a cylinder and a spherical groove is provided in the middle of the lower bottom surface of the cylinder, the control ball is fitted in the spherical groove of the sealing cylinder, and the air permeable plate is in the shape of a circular plate and a plurality of evenly distributed through holes are provided on the plate.

[0008] Preferably, the second spring sheet is shaped as a U-shaped plate and the two ends of the plate body are bent to both sides respectively. The second spring sheet is fitted in the T-shaped plate groove opened on the support plate, and the second part of the spring sheet protrudes into the arc groove opened on the pressure plate.

[0009] Preferably, the pressure plate and the spring sheet are fitted in an arc column groove opened on the support plate, the pressure plate is an arc column, a side wall of the pressure plate is provided with a plurality of evenly distributed spherical grooves, and the piston column part protrudes into the spherical groove on the pressure plate.

[0010] Preferably, the piston column is shaped like a cylinder with a hemisphere integrally connected to one end, and a fixing ring on the cylindrical side wall of the piston column is provided with a plurality of evenly distributed protruding sliders, and the protruding slider part on the piston column extends into a slide groove opened on the inner wall of the cylindrical groove on the support plate.

[0011] A method for testing dynamic strain characteristics of a building structure under blasting, comprising the following steps:

[0012] Step 1: Bury explosives at a designated location above the tunnel, fix the vertical plate on the supporting column in the tunnel by bolts, and then fix the position of the entire detection device, and make the upper end of the pressure plate press against the beam through the rebound of the second spring;

[0013] Step 2: Before the test, water is poured into the U-shaped tube, and the water is retained in the curved section of the U-shaped tube. At this time, the water level on the U-shaped tube is recorded;

[0014] Step 3: Then, blasting work is started. The vibration generated by the blasting acts on the crossbeam, causing the pressure plate to move, causing the air flow in the U-shaped tube to flow, and the external air flow gradually flows into the U-shaped tube. The water level on one side of the U-shaped tube gradually rises until the vibration caused by the blasting ends;

[0015] Step 4: By observing the water level on the U-shaped tube, the staff can understand the impact of blasting vibration on the building;

[0016] Step 5: The staff can press the interceptor plate upwards to force the water in the U-tube to drain out, so that a second measurement experiment can be carried out by refilling water;

[0017] Step 6: After multiple blasting measurements, the staff will have multiple sets of data for analysis and summary.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The structural design of the present invention effectively improves the efficiency of the technical research work on the dynamic response characteristics of building structures under the action of tunnel blasting, realizes the dynamic strain characteristic test of building structures under the action of blasting vibration, and has stable and powerful functions;

[0020] 2. The device causes the reciprocating motion of the piston column through the movement of the pressure plate, thereby realizing stable airflow control transmission. During the continuous vibration, the external gas is continuously sucked into the U-shaped tube, forcing the water level in the curved section of the U-shaped tube to gradually flow to the pipe on one side of the U-shaped tube, forcing the water level in the pipe on one side of the U-shaped tube to rise, and the intensity of the vibration is fed back by the height of the rising water level. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the pressure plate structure;

[0023] Figure 3 Schematic diagram of the gas valve structure;

[0024] Figure 4 This is a schematic diagram of the vertical plate structure.

[0025] In the figure: 1 control plate, 2 support plate, 3 pressure plate, 4 spring sheet 1, 5 spring sheet 2, 6 piston rod, 7 spring 1, 8 hose, 9 vertical plate, 10 guide rod, 11 spring 2, 12 air valve, 13 interception valve, 14 outer tube, 15 pull rod, 16 sealing ball, 17 interception disk, 18 spring 3, 19 sealing tube, 20 control ball, 21 spring 4, 22 breathable plate, 23 U-shaped tube, 24 bolt, 25 L-shaped tube cavity. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the technical solutions in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 4The present invention provides a technical solution: a dynamic strain characteristic testing device of a building structure under the action of blasting vibration, comprising a control panel 1, a support panel 2 is fixedly connected to one side of the control panel 1, a pressure panel 3 and a spring sheet 4 are arranged in the support panel 2, one end of the pressure panel 3 contacts the spring sheet 4, and the other end of the pressure panel 3 extends to the outside of the support panel 2, a spring sheet 5 is arranged on one side of the pressure panel 3, the other side of the pressure panel 3 contacts a piston column 6, one end of the piston column 6 contacts a spring 7, the piston column 6 and the spring 7 are arranged in a cylindrical groove opened on the support panel 2, a hose 8 is fixedly connected to one side of the support panel 2, one end of the hose 8 extends to the cylindrical groove on the support panel 2, a vertical plate 9 is arranged at the lower end of the control panel 1, a guide rod 10 is connected between the control panel 1 and the vertical plate 9, the upper end of the guide rod 10 is fixedly connected to the control panel 1, and the lower end of the guide rod 10 extends to the vertical plate 9, a spring 2 11 is sleeved on the guide rod 10, a U-shaped tube 23 is fixedly connected to one side of the vertical plate 9, the other end of the hose 8 extends into the U-shaped tube 23, and an air valve 12 is respectively arranged at the upper and lower ends of the docking position of the hose 8 and the U-shaped tube 23, an interception valve 13 is connected to the bottom of the U-shaped tube 23, the interception valve 13 comprises an outer tube 14, a pull rod 15, a sealing ball 16, an interception disk 17 and a spring 3 18, the middle part of the outer tube 14 is movably sleeved with the pull rod 15, the outer tube 14 passes through the shell of the U-shaped tube 23, the upper end of the pull rod 15 is fixedly connected with the sealing ball 16, the sealing ball 16 is arranged in the U-shaped tube 23, the lower end of the pull rod 15 is fixedly connected with the interception disk 17, a spring 3 18 is arranged between the outer tube 14 and the interception disk 17, the spring 3 18 is sleeved on the pull rod 15, an L-shaped tube cavity 25 is opened on the vertical plate 9, the lower end of the guide rod 10 extends into the L-shaped tube cavity 25, refer to Figure 1 The present invention is arranged at the intersection of the roof column and the cross beam, and the vertical plate 9 is fixed to the column by bolts 24, and the upper end of the pressure plate 3 is in contact with the cross beam.

[0028] The air valve 12 includes a sealing cylinder 19, a control ball 20, a spring four 21 and a breathable plate 22. The upper end of the spring four 21 contacts the control ball 20, and the lower end of the spring four 21 contacts the breathable plate 22. The upper end of the control ball 20 is provided with a sealing cylinder 19, and the sealing cylinder 19 and the breathable plate 22 are fixed on the inner wall of the U-shaped tube 23.

[0029] The sealing cylinder 19 is in the shape of a cylinder and a spherical groove is provided in the middle of the bottom surface of the cylinder. The control ball 20 is fitted in the spherical groove of the sealing cylinder 19. The air permeable plate 22 is in the shape of a circular plate and a plurality of evenly distributed through holes are provided on the plate.

[0030] The spring sheet 2 5 is in the shape of a U-shaped plate with two ends of the plate body bent to both sides respectively. The spring sheet 2 5 is fitted in the T-shaped plate groove opened on the support plate 2 , and part of the spring sheet 2 5 protrudes into the arc groove opened on the pressure plate 3 .

[0031] The pressure plate 3 and the spring sheet 4 are fitted in the arc column groove opened on the support plate 2. The pressure plate 3 is an arc column. A plurality of evenly distributed spherical grooves are opened on one side wall of the pressure plate 3. The piston column 6 partially protrudes into the spherical groove on the pressure plate 3.

[0032] The piston column 6 is shaped like a cylinder with one end integrally connected to a hemisphere. A fixing ring on the cylindrical side wall of the piston column 6 is provided with a plurality of evenly distributed protruding sliders. The protruding slider part on the piston column 6 extends into a slide groove opened on the inner wall of the cylindrical groove on the support plate 2.

[0033] A method for testing dynamic strain characteristics of a building structure under blasting, comprising the following steps:

[0034] Step 1: Bury explosives at a designated location above the tunnel, fix the vertical plate 9 on the supporting column in the tunnel by bolts 24, and then fix the position of the entire detection device, and make the upper end of the pressure plate 3 press against the beam through the rebound of the spring 2 11;

[0035] Step 2: Before the test, water is poured into the U-shaped tube 23, and the water is retained in the curved section of the U-shaped tube 23. At this time, the water level on the U-shaped tube 23 is recorded;

[0036] Step 3: Then, blasting is started. The vibration generated by the blasting acts on the crossbeam, causing the pressure plate 3 to move, causing the air flow in the U-shaped tube 23 to flow, and the external air flow gradually flows into the U-shaped tube 23. The water level on one side of the U-shaped tube 23 gradually rises until the vibration generated by the blasting ends;

[0037] Step 4: The staff can understand the impact of blasting vibration on the building by observing the water level on the U-shaped tube 23;

[0038] Step 5: The staff can press the interception plate 17 upwards to force the water in the U-shaped tube 23 to be discharged, so that a second measurement experiment can be carried out by refilling water;

[0039] Step 6: After multiple blasting measurements, the staff will have multiple sets of data for analysis and summary.

[0040] Working principle: when vibration occurs, the crossbeam swings up and down, forcing the pressure plate 3 to retract into the support plate 2. The pressure plate 3 is pushed back and forth by the rebound of the spring sheet 4, and the pressure plate 3 moves the piston column 6, which cooperates with the spring 7 to rebound and support the piston column 6. In this way, the piston column 6 moves back and forth, causing the flow of air. In the process of inserting into the pressure plate 3, air suction is generated, so that the external gas is sucked between the two interception valves 13, and the piston column 6 is pulled out of the pressure plate 3. The airflow thrust pushes the airflow between the two interception valves 13 downward into the U-shaped tube 23. In this cycle, the airflow is gradually injected into the U-shaped tube 23 through the two interception valves 13. The water level is stored in the curved part of the U-shaped tube 23, so that the water level gradually rises in the U-shaped tube 23, that is, in the pipeline without the interception valve 13 on the other side of the U-shaped tube 23, the water level gradually rises. After the vibration is over, the staff observes the rising water level in the U-shaped tube 23 to understand the vibration intensity.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the dynamic strain characteristics of a building structure under blasting, comprising a control panel (1), characterized in that: One side of the control plate (1) is fixedly connected to a support plate (2), a pressure plate (3) and a spring sheet (4) are arranged in the support plate (2), one end of the pressure plate (3) contacts the spring sheet (4), the other end of the pressure plate (3) extends to the outside of the support plate (2), one side of the pressure plate (3) is provided with a spring sheet (5), the other side of the pressure plate (3) contacts a piston column (6), one end of the piston column (6) contacts a spring sheet (7), the piston column (6) and the spring sheet (7) are arranged The control panel (1) is placed in a cylindrical groove opened on the support plate (2); a hose (8) is fixedly connected to one side of the support plate (2); one end of the hose (8) extends into the cylindrical groove on the support plate (2); a vertical plate (9) is arranged at the lower end of the control panel (1); a guide rod (10) is connected between the control panel (1) and the vertical plate (9); the upper end of the guide rod (10) is fixedly connected to the control panel (1); the lower end of the guide rod (10) extends into the vertical plate (9); a spring (11) is sleeved on the guide rod (10); A U-shaped tube (23) is fixedly connected to one side of the vertical plate (9), the other end of the hose (8) extends into the U-shaped tube (23), and an air valve (12) is provided at the upper and lower ends of the butt joint of the hose (8) and the U-shaped tube (23), respectively. An interception valve (13) is connected to the bottom of the U-shaped tube (23), and the interception valve (13) comprises an outer tube (14), a pull rod (15), a sealing ball (16), an interception disc (17) and a spring (18), and the middle part of the outer tube (14) is movably sleeved with the pull rod (15). The outer cylinder (14) passes through the shell of the U-shaped tube (23); the upper end of the pull rod (15) is fixedly connected to a sealing ball (16), and the sealing ball (16) is arranged in the U-shaped tube (23); the lower end of the pull rod (15) is fixedly connected to an interception disk (17); a spring three (18) is arranged between the outer cylinder (14) and the interception disk (17); the spring three (18) is sleeved on the pull rod (15); an L-shaped tube cavity (25) is opened on the vertical plate (9), and the lower end of the guide rod (10) extends into the L-shaped tube cavity (25); The air valve (12) comprises a sealing cylinder (19), a control ball (20), a spring four (21) and a breathable plate (22); the upper end of the spring four (21) contacts the control ball (20), the lower end of the spring four (21) contacts the breathable plate (22), the upper end of the control ball (20) is provided with a sealing cylinder (19), and the sealing cylinder (19) and the breathable plate (22) are fixed on the inner wall of the U-shaped tube (23); The spring sheet 2 (5) is in the shape of a U-shaped plate, and the two ends of the plate body are bent towards both sides respectively. The spring sheet 2 (5) is fitted into a T-shaped plate groove provided on the support plate (2), and a portion of the spring sheet 2 (5) protrudes into an arc-shaped groove provided on the pressure plate (3).

2. The dynamic strain characteristic testing device of a building structure under blasting according to claim 1 is characterized by: The sealing cylinder (19) is in the shape of a cylinder and a spherical groove is provided in the middle of the bottom surface of the cylinder. The control ball (20) is fitted in the spherical groove of the sealing cylinder (19). The air permeable plate (22) is in the shape of a circular plate and a plurality of evenly distributed through holes are provided on the plate.

3. The dynamic strain characteristic testing device of a building structure under blasting according to claim 1 is characterized by: The pressure plate (3) and the spring sheet (4) are fitted in an arc column groove provided on the support plate (2); the pressure plate (3) is in the shape of an arc column; a plurality of evenly distributed spherical grooves are provided on one side wall of the pressure plate (3); a portion of the piston column (6) protrudes into the spherical groove on the pressure plate (3).

4. The dynamic strain characteristic testing device of a building structure under blasting according to claim 1 is characterized by: The piston column (6) is shaped like a cylinder with one end integrally connected to a hemispherical body. A fixing ring on the cylindrical side wall of the piston column (6) is provided with a plurality of evenly distributed protruding sliding blocks. The protruding sliding blocks on the piston column (6) extend into a sliding groove provided on the inner wall of the cylindrical groove on the support plate (2).

5. A testing method using the dynamic strain characteristic testing device of a building structure under blasting action as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: bury explosives at a designated position above the tunnel, fix the vertical plate (9) on the supporting column in the tunnel by bolts (24), thereby fixing the position of the entire detection device, and make the upper end of the pressure plate (3) press against the crossbeam through the rebound of the second spring (11); Step 2: Before the test, water is poured into the U-shaped tube (23), and the water is retained in the curved section of the U-shaped tube (23). At this time, the water level on the U-shaped tube (23) is recorded; Step 3: Then, blasting is started, and the vibration generated by the blasting acts on the crossbeam, causing the pressure plate (3) to move, causing the air flow in the U-shaped tube (23), and the external air flow gradually flows into the U-shaped tube (23), and the water level on one side of the U-shaped tube (23) gradually rises until the vibration generated by the blasting ends; Step 4: The staff can understand the impact of the blasting vibration on the building by observing the water level on the U-shaped pipe (23); Step 5: The staff can press the interception plate (17) upwards to force the water in the U-shaped tube (23) to be discharged, so that a second measurement experiment can be carried out by refilling water; Step 6: After multiple blasting measurements, the staff will have multiple sets of data for analysis and summary.

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