Foundation pit blasting damping structure under complex environment
By setting up vibration isolation zones and pre-splitting holes in the blasting area of the foundation pit, and using air bags to form air isolation, the problem of unstable surrounding rock and vibration caused by overly dense blast hole layout was solved, achieving the effect of reducing blasting vibration and protecting the slope.
Patent Information
- Application Number
- CN202520274684.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Existing technologies, when used for blasting foundation pits in complex environments, result in overly dense blast hole layouts, leading to unstable surrounding rock, cracks, and over- or under-excavation, increasing construction costs. Furthermore, blasting vibrations may affect the safety of surrounding facilities.
A vibration damping zone is set between the blasting area and the protected area, including vibration isolation holes and pre-splitting holes. The vibration isolation holes are filled with air bags to form air vibration isolation, and vibration damping joints are formed by pre-splitting blasting to reduce vibration transmission.
It effectively protects slope stability, reduces the impact of blasting vibrations on surrounding facilities, and lowers construction risks and costs.
Smart Images
Figure CN223623501U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of blasting excavation technology, specifically relating to a shock-absorbing structure for foundation pit blasting in complex environments. Background Technology
[0002] The blasting excavation of waterway foundation pits requires high standards for slope and bottom slab formation. Currently used conventional pre-splitting blasting technology suffers from the following problems: overly dense blast hole layout and numerous drilling operations; it easily causes cracks in the surrounding rock, affecting its stability; and it frequently results in over- or under-excavation, increasing construction costs and delaying progress. Furthermore, blasting operations pose a potential safety hazard to surrounding residential buildings and structures. Exceeding blasting vibration limits could cause abnormal movements in critical equipment or even lead to major safety accidents such as building cracking and collapse.
[0003] Therefore, controlling the seismic effects generated during blasting and excavation to prevent damage to surrounding facilities is a major technical challenge we currently face. Summary of the Invention
[0004] To address the aforementioned issues, this utility model discloses a vibration damping structure for foundation pit blasting in complex environments. By setting up vibration isolation holes and filling the holes with air bags to form air isolation, pre-splitting holes are drilled on the outside of the vibration isolation holes for pre-splitting blasting to form vibration damping joints, thus ensuring the vibration damping effect.
[0005] To achieve the above objectives, the technical solution of this utility model is as follows:
[0006] A vibration damping structure for foundation pit blasting in a complex environment includes a damping strip disposed between a blasting zone and a protection zone, wherein multiple blasting holes are provided in the blasting zone;
[0007] The damping strip includes a vibration isolation hole area and a pre-cracked hole area;
[0008] The vibration isolation hole area is located on the side closer to the protected area, and the pre-splitting hole area is located on the side closer to the blasting area;
[0009] The isolation hole area is provided with at least three rows of isolation holes; the pre-crack hole area is provided with at least one row of pre-crack holes and one row of buffer holes.
[0010] The vibration isolation hole has an air bladder inside its wall, and the medium in the air bladder is gas. The air bladder is in contact with the hole wall.
[0011] Preferably, the depth of the blast hole is h1, and the depth of the vibration isolation hole is h2, where h2 > h1.
[0012] Preferably, the difference between the depth h2 of the vibration isolation hole and the depth h1 of the blast hole is a, where a>1m.
[0013] Preferably, the vibration isolation hole area is provided with three rows of vibration isolation holes, which are arranged in a plum blossom pattern.
[0014] Preferably, the distance between the first row of vibration isolation holes and the second row of vibration isolation holes 12 is L1, and the distance between the second row of vibration isolation holes and the third row of vibration isolation holes is L2, where L1=L2.
[0015] Preferably, L1=L2=0.5m, the spacing between the holes in each row of vibration isolation holes is 0.5m, and the diameter of the vibration isolation holes is 115mm.
[0016] Preferably, the airbag includes a strip-shaped rubber bag.
[0017] Preferably, the depth of the pre-splitting hole and the buffer hole is the same as the depth of the blasting hole, and the pre-splitting hole is blasted before the blasting hole.
[0018] Preferably, the diameter of the pre-cracked hole is d=76mm, and the hole spacing of the pre-cracked hole is 7d~12d.
[0019] Preferably, the spacing between the blasting holes is 2.7m, and the spacing between the buffer holes is 1 / 2 to 1 / 3 of the spacing between the blasting holes.
[0020] The beneficial effects of this utility model are as follows:
[0021] This invention, based on the site environment, sets up a vibration isolation zone and fills the vibration isolation zone with air bags to form air vibration isolation, using air as a buffer medium to ensure the vibration reduction effect. Pre-splitting holes are drilled on one side of the vibration isolation zone for pre-splitting blasting. During blasting, the blasting is initiated before the main blasting zone to form a vibration reduction joint, which can protect the stability of the slope and greatly reduce the propagation of blasting vibration. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the distribution of the foundation pit blasting damping structure in a complex environment as shown in this utility model;
[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the foundation pit blasting damping structure shown in this utility model under complex environment;
[0024] Figure 3 This is a schematic diagram of the structure of the vibration isolation hole shown in this utility model.
[0025] List of identifiers in attached diagrams:
[0026] 10. Isolation hole area; 10a. Hole wall of isolation hole; 10b. Air bag; 11. First row of isolation holes; 12. Second row of isolation holes; 13. Third row of isolation holes; 20. Pre-splitting hole area; 21. Pre-splitting hole; 22. Buffer hole; 100. Blasting area; 101. Blasting hole; 200. Protected area. Detailed Implementation
[0027] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.
[0028] like Figure 1 As shown, the present invention provides a shock-absorbing structure for foundation pit blasting in a complex environment, including a shock-absorbing strip disposed between the blasting area 100 and the protection area 200, and a plurality of blasting holes 101 provided in the blasting area 100.
[0029] Optionally, protected area 200 is the completed area of the power plant, and blasting area 100 is the later project to be blasted and excavated. Blasting operations in blasting area 100 need to be carried out under the condition that the equipment in the completed area is operating normally.
[0030] Since the blasting area 100 is close to the sea and the seawater has strong penetrability, the drilling operations are all water holes, making static crushing difficult. Therefore, dynamic blasting is used to complete the construction. In order to reduce the impact of blasting vibration on the protected area 200, a vibration damping zone is set between the blasting area 100 and the protected area 200. The length of the vibration damping zone is greater than the length of the blasting area 100.
[0031] The damping zone includes the isolation hole area 10 and the pre-splitting hole area 20.
[0032] Specifically, the isolation hole area 10 is located on the side closer to the protection area 200, and the pre-splitting hole area 20 is located on the side closer to the blasting area 100.
[0033] Optionally, the isolation hole area 10 is provided with at least three rows of isolation holes.
[0034] Optionally, the pre-cracked hole area 20 is provided with at least one row of pre-cracked holes 21 and one row of buffer holes 22.
[0035] Since the drilling operations all involve water holes, meaning water seeps into the air, and water is incompressible, the vibration reduction effect will be significantly reduced if the water in the isolation holes is not removed. Therefore, air bags 10b are installed inside the hole wall 10a of the isolation holes. Figure 3 As shown, the medium in the air bag 10b is gas, and the outer diameter of the air bag 10b is slightly larger than the inner diameter of the hole wall 10a, so that the air bag 10b fits into the hole wall 10a.
[0036] In this way, the water in the shock-absorbing hole is squeezed out by the air bag 10b, forming a shock-absorbing hole with air as the medium, which can better isolate and buffer the shock wave generated by the explosion.
[0037] Furthermore, the depth of the blast hole 101 is h1, and the depth of the vibration isolation hole is h2, where h2>h1. Thus, by increasing the depth of the vibration isolation hole, a larger isolation range can be achieved, resulting in a better vibration isolation effect.
[0038] Preferably, the difference between the depth h2 of the isolation hole and the depth h1 of the blast hole 101 is >1m.
[0039] In a specific embodiment, the vibration isolation hole area 10 is provided with three rows of vibration isolation holes, which are arranged in a plum blossom pattern.
[0040] like Figure 2 As shown, the distance between the first row of isolation holes 11 and the second row of isolation holes 12 is L1, and the distance between the second row of isolation holes 12 and the third row of isolation holes 13 is L2, where L1=L2. L1=L2=0.5m, the hole spacing in each row of isolation holes is 0.5m, and the hole diameter is 115mm.
[0041] Thus, by setting up large-diameter isolation holes in a staggered, quincunx pattern, a good vibration wave isolation effect can be achieved in all directions.
[0042] Preferably, the air bladder 10b includes a strip-shaped rubber bag. Thus, the strip-shaped rubber bag can adapt to the narrow, elongated vibration isolation hole structure. By inflating the strip-shaped rubber bag, water in the vibration isolation hole can be squeezed out, changing the vibration isolation hole from a water-medium buffer to an air-medium buffer.
[0043] like Figure 2 As shown, the depths of the pre-splitting hole 21 and the buffer hole 22 are the same as the depth of the blasting hole 101, and the pre-splitting hole 21 is detonated before the blasting hole 101. Thus, before the blasting hole 101 in the blasting area 100 is detonated, the detonation of the pre-splitting hole 21 creates a pre-crack between the blasting area 100 and the vibration isolation hole, which serves to buffer the shock wave.
[0044] Optionally, the diameter of the pre-cracked hole 21 is d=76mm, and the hole spacing of the pre-cracked hole 21 is 7d~12d.
[0045] Furthermore, the spacing between the blasting holes 101 is 2.7m, and the spacing between the buffer holes 22 is 1 / 2 to 1 / 3 of the spacing between the blasting holes 101. The spacing between the buffer holes 22 is slightly larger than the spacing between the pre-splitting holes 21, which can reduce the impact of the blasting of the blasting holes 101 on the pre-splitting holes and play an effective anti-collision buffering role.
[0046] In conjunction with the above embodiments, this utility model, based on the site environment, sets up a vibration isolation zone and fills the vibration isolation zone with air bags to form air vibration isolation, using air as a buffer medium to ensure the vibration reduction effect. A pre-splitting hole is drilled on one side of the vibration isolation zone for pre-splitting blasting. During blasting, the blasting is initiated before the main blasting zone to form a vibration reduction joint, which can protect the stability of the slope and greatly reduce the propagation of blasting vibration.
[0047] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.
Claims
1. A vibration damping structure for foundation pit blasting in complex environments, characterized in that, It includes a shock-absorbing strip disposed between the blasting zone (100) and the protection zone (200), wherein the blasting zone (100) is provided with a plurality of blast holes (101). The damping strip includes a vibration isolation hole area (10) and a pre-cracked hole area (20). The isolation hole area (10) is located on the side closer to the protection area (200), and the pre-splitting hole area (20) is located on the side closer to the blasting area (100); The isolation hole area (10) is provided with at least three rows of isolation holes; the pre-crack hole area (20) is provided with at least one row of pre-crack holes and one row of buffer holes; The vibration isolation hole has an air bag (10b) inside the hole wall (10a), the medium in the air bag (10b) is gas, and the air bag (10b) is attached to the hole wall (10a).
2. The foundation pit blasting damping structure in complex environments according to claim 1, characterized in that, The depth of the blast hole (101) is h1, and the depth of the vibration isolation hole is h2, where h2>h1.
3. The foundation pit blasting damping structure in complex environments according to claim 2, characterized in that, The difference between the depth h2 of the isolation hole and the depth h1 of the blast hole (101) is a, where a>1m.
4. The foundation pit blasting vibration damping structure according to claim 1, characterized in that, The isolation hole area (10) is provided with three rows of isolation holes, which are arranged in a plum blossom pattern.
5. The foundation pit blasting vibration damping structure according to claim 4, characterized in that, The distance between the first row of isolation holes (11) and the second row of isolation holes (12) is L1, and the distance between the second row of isolation holes (12) and the third row of isolation holes (13) is L2, where L1 = L2.
6. The foundation pit blasting damping structure according to claim 5, characterized in that, L1=L2=0.5m, the spacing between the isolation holes in each row is 0.5m, and the diameter of the isolation holes is 115mm.
7. The foundation pit blasting damping structure according to claim 1, characterized in that, The airbag (10b) comprises a strip-shaped rubber bag.
8. The foundation pit blasting vibration damping structure according to claim 1, characterized in that, The depth of the pre-splitting hole and the buffer hole is the same as the depth of the blasting hole (101), and the pre-splitting hole is blasted before the blasting hole (101).
9. The foundation pit blasting vibration damping structure according to claim 1, characterized in that, The diameter of the pre-cracked hole is d=76mm, and the hole spacing is 7d~12d.
10. The foundation pit blasting vibration damping structure according to claim 1, characterized in that, The hole spacing of the blasting hole (101) is 2.7m, and the hole spacing of the buffer hole is 1 / 2 to 1 / 3 of the hole spacing of the blasting hole (101).