Foundation pit blasting protection device
By using a pit protection structure composed of sandbags and steel plates, as well as a wellhead protection structure with multiple layers of steel wire mesh and steel wire ropes, the adverse effects of flying rocks and vibrations on the surrounding structures were resolved, thus achieving environmental protection and construction safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA RAILWAY NO 2 ENG GROUP CO LTD
- Filing Date
- 2025-07-04
- Publication Date
- 2026-06-19
Smart Images
Figure CN224382305U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of foundation pit blasting construction, and in particular to a foundation pit blasting protection device. Background Technology
[0002] During urban foundation pit blasting construction, adverse factors such as flyrock and vibration can have significant negative impacts on surrounding above-ground structures. Flyrock generated by blasting may be ejected at high speed, directly impacting the exterior walls, windows, or equipment of nearby buildings, causing structural damage or even safety accidents. Blasting vibrations propagate through the soil and rock medium, potentially causing vibration responses in the ground and adjacent buildings. When the vibration intensity exceeds the allowable threshold, it can lead to damage such as cracks in building structures, wall fissures, and peeling of decorative layers, posing a greater threat to older or structurally fragile buildings. Furthermore, frequent blasting vibrations may also cause deformation or loosening of joints in nearby underground pipelines, thereby affecting the normal operation of municipal facilities. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies in urban foundation pit blasting construction, where flying rocks and vibrations can have adverse effects on the above-ground structure, and to provide a foundation pit blasting protection device.
[0004] In a first aspect, this utility model provides a foundation pit blasting protection device, comprising:
[0005] The pit protection structure includes sandbags and steel plates. The sandbags are placed above the blast holes, and the steel plates are placed above the sandbags. The thickness of the steel plates is greater than or equal to 2 cm.
[0006] The wellhead protection structure includes multiple layers of steel wire mesh and multiple steel wire ropes. The multiple layers of steel wire mesh cover the wellhead of the foundation pit, and the multiple steel wire ropes are laid out in pairs above the steel wire mesh. The steel wire ropes are fixedly connected to the embedded parts of the foundation pit cap beam.
[0007] Preferably, the foundation pit cap beam is pre-embedded with fasteners, and the steel wire rope is fixedly connected to the fasteners.
[0008] Preferably, the foundation pit cap beam is a ring beam, and the fasteners are evenly spaced along the circumference of the foundation pit cap.
[0009] Preferably, the fastener is a U-shaped clip or a wire rope clip.
[0010] Preferably, the wire rope and the fastener are tightened by a screw thread.
[0011] Preferably, the steel wire protective net has at least three layers.
[0012] Preferably, the steel wire rope is tied and fixed to the embedded parts of the foundation pit cap beam.
[0013] Preferably, the edge of the wire mesh protective net is provided with a pressure strip, and the pressure strip is fixedly connected to the ground.
[0014] Preferably, the sandbags have at least two layers.
[0015] Preferably, the sandbags in the second layer are placed in a staggered manner compared to the sandbags in the first layer.
[0016] Preferably, the steel plate has two layers, wherein one steel plate overlaps at the gap between two adjacent steel plates in the first layer.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] This utility model provides a foundation pit blasting protection device. The pit-entry protection structure, composed of sandbags and steel plates, significantly reduces the impact of blasting vibrations on the surrounding environment. By combining the pit-entry protection structure with the wellhead protection structure, it controls the ejection of flying rocks from the wellhead, thereby controlling the damage to the superstructure caused by blasting debris. Furthermore, fixing the steel wire rope to the embedded parts of the foundation pit cap beam improves the connection stability of the steel wire mesh, ensuring the protective effect. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the pit protection structure described in this utility model.
[0020] Figure 2 This is a schematic diagram of the wellhead protection structure described in this utility model.
[0021] Marked in the image:
[0022] 1-Sandbag, 2-Steel plate, 3-Steel wire mesh, 4-Steel wire rope, 5-Foundation pit capping beam, 6-Loading section, 7-Backfill section, 8-Fastener, 9-Pressure strip. Detailed Implementation
[0023] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0024] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0025] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0026] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0027] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0028] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0029] Example 1
[0030] like Figures 1-2 As shown, a foundation pit blasting protection device includes an in-pit protection structure and a wellhead protection structure.
[0031] like Figure 1 As shown, the protective structure inside the pit includes sandbags 1 and steel plates 2. The sandbags 1 are placed above the blast hole. Specifically, the blast hole typically includes a charging section 6 and a backfilling section 7. The backfilling section 7 is located above the charging section 6. By backfilling with gravel, clay, etc., the impact of the blast on the surrounding environment can be further reduced. The sandbags 1 are placed above the backfilling section 7, and the steel plates 2 are placed above the sandbags 1. The sandbags 1 and the steel plates 2 can reduce the transmission of vibrations generated by the blast to surrounding buildings. At the same time, the sandbags 1 and the steel plates 2 can also control the flyrock generated by the blast from flying out of the wellhead, thereby controlling the impact of flyrock on the upper structure.
[0032] Furthermore, the sandbag 1 can be a single layer, completely covering the top of the blast hole. In some preferred embodiments, to achieve better protection, the sandbag 1 can be set to at least two layers, such as two, three, or four layers. The upper layer of sandbag 1 can be staggered with the lower layer of sandbag 1, that is, the upper layer of sandbag 1 is placed in the gap between two adjacent sandbags 1 in the lower layer. For example, the second layer of sandbag 1 is placed in the gap between two adjacent sandbags 1 in the first layer, and the third layer of sandbag 1 is placed in the gap between two adjacent sandbags 1 in the second layer.
[0033] Furthermore, the thickness of the steel plate 2 is greater than or equal to 2cm. A thickness of 2cm or greater can achieve a better vibration reduction effect, thereby reducing the vibration impact on surrounding buildings and improving construction safety. Only one layer of steel plate 2 can be used, meaning only one layer of steel plate 2 covers the sandbag 1. In some preferred embodiments, the number of layers of steel plate 2 can be set to at least two, such as two, three, or four layers, with each layer of steel plate 2 overlapping the gap of the next layer. For example, with two layers of steel plate 2, the first layer covers the sandbag 1, and the second layer overlaps the gap of the first layer, thus achieving better vibration reduction and preventing flying stones.
[0034] like Figure 2 As shown, the wellhead protection structure includes multiple layers of steel wire mesh 3. The steel wire mesh 3 has at least two layers, but typically 3-5 layers are used. The area of the steel wire mesh 3 is usually set slightly larger than the wellhead area to ensure complete coverage of the wellhead, thereby reducing the probability of flying rocks exiting the well. The mesh opening size formed by the steel wire mesh 3 can be less than or equal to 1 mm. 2 This achieves better vibration reduction and prevention of flying rocks. Multiple steel wire ropes 4 are laid above the steel wire protective net 3. The multiple steel wire ropes 4 can be evenly spaced along the circumference of the well opening, and each steel wire rope 4 can pass through the center of the well opening. By pulling the steel wire ropes 4 in opposite directions, the steel wire protective net 3 can be fixed to the well opening.
[0035] When constructing the foundation pit wellhead, a foundation pit capping beam 5 can be set up, and fasteners 8 can be pre-embedded in the foundation pit capping beam 5. The fasteners 8 are used to fix and connect with the steel wire rope 4.
[0036] Furthermore, in some preferred embodiments, the foundation pit capping beam 5 is a ring beam, and the fasteners 8 are arranged in the circumferential direction of the foundation pit capping beam 5 and are evenly spaced. The position of the fasteners 8 can be consistent with the position of the wire rope 4. In this way, a better fixed connection with the wire rope 4 can be achieved, ensuring that the wire rope 4 can be tightened and fixed.
[0037] Furthermore, in some preferred embodiments, the foundation pit capping beam 5 is a square beam, and the fasteners 8 are arranged around the foundation pit capping beam 5 at even intervals, that is, the fasteners 8 are arranged on all four sides of the foundation pit capping beam 5, and the positions of the fasteners 8 are evenly spaced. The positions of the fasteners 8 can be consistent with the positions of the wire rope 4, so as to achieve a better fixed connection with the wire rope 4 and ensure that the wire rope 4 can be tightened and fixed.
[0038] In some preferred embodiments, the number of steel wire ropes 4 is 6, and the 6 steel wire ropes 4 are evenly spaced along the circumference of the foundation pit cap beam 5. Each steel wire rope 4 passes through the center of the foundation pit cap beam 5. Then the number of fasteners 8 is 12, and the two ends of each steel wire rope 4 are fixedly connected to one of the fasteners 8.
[0039] In some preferred embodiments, the number of steel wire ropes 4 is 8, and the 8 steel wire ropes 4 are evenly spaced along the circumference of the foundation pit cap beam 5. Each steel wire rope 4 passes through the center of the foundation pit cap beam 5. Then the number of fasteners 8 is 16, and the two ends of each steel wire rope 4 are fixedly connected to one of the fasteners 8.
[0040] Furthermore, in some preferred embodiments, the fastener is a U-shaped clip or a wire rope clip, and the wire rope 4 is tightened to the fastener 8 via a screw thread. Using a screw thread to tighten and fix the wire rope 4 is convenient, reliable, and durable: the screw thread allows for fine-tuning through threaded rotation, precisely controlling the tension of the wire rope to ensure the protective net is taut and flat, preventing loosening or deformation; simultaneously, the metal screw thread is corrosion-resistant, bears load evenly, and is not prone to loosening over long-term use, thus improving installation efficiency and enhancing the overall structural stability.
[0041] In some alternative implementations, the wire rope 4 can also be directly tied to the fastener 8, which makes construction more convenient.
[0042] In some optional embodiments, in order to ensure the stable connection of the wire mesh 3, pressure strips 9 can be set at the edge of the wire mesh 3. Galvanized or stainless steel pressure strips 9 (usually U-shaped or L-shaped) are used to cover the edge of the wire mesh 3. Holes are drilled in the ground using an impact drill and expansion bolts or chemical anchors are inserted. Finally, the pressure strips 9 and the wire mesh 3 are fastened to the ground with screws to ensure that the pressure strips 9 are evenly stressed and compact the mesh surface. If necessary, rubber strips can be added under the pressure strips to enhance friction and prevent slippage.
[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A foundation pit blasting protection device, characterized in that, include: The pit protection structure includes sandbags (1) and steel plates (2). The sandbags (1) are placed above the blast holes, and the steel plates (2) are placed above the sandbags (1). The thickness of the steel plates (2) is greater than or equal to 2 cm. The wellhead protection structure includes multiple layers of steel wire mesh (3) and multiple steel wire ropes (4). The multiple layers of steel wire mesh (3) cover the wellhead of the foundation pit, and the multiple steel wire ropes (4) are laid out in pairs above the steel wire mesh (3). The steel wire ropes (4) are fixedly connected to the embedded parts of the foundation pit cap beam (5).
2. The foundation pit blasting protection device according to claim 1, characterized in that, The foundation pit cap beam (5) is pre-embedded with fasteners (8), and the steel wire rope (4) is fixedly connected to the fasteners (8).
3. A protection device for a foundation pit blasting according to claim 2, characterized in that, The foundation pit capping beam (5) is a ring beam, and the fasteners (8) are evenly spaced along the circumference of the foundation pit capping beam (5).
4. The pit blasting protection apparatus according to claim 2, wherein The fastener (8) is a U-shaped clip or a wire rope clip.
5. A protection device for a foundation pit blasting according to claim 4, characterized in that, The wire rope (4) and the fastener (8) are tightened by a screw thread.
6. The excavation blast protection apparatus of claim 1, wherein, The steel wire protective net (3) has at least 3 layers.
7. The excavation blast protection apparatus of claim 1, wherein, The steel wire rope (4) is tied and fixed to the embedded part of the foundation pit cap beam (5).
8. A protection device for blasting of a foundation pit according to any of claims 1-7, characterized in that The edge of the wire mesh (3) is provided with a pressure strip (9), which is fixedly connected to the ground.
9. A protection device for blasting of a foundation pit according to any of claims 1-7, characterized in that The number of layers of the sandbags (1) is at least 2, and the sandbags (1) in the second layer are placed in a staggered manner from the sandbags (1) in the first layer.
10. A protection device for blasting of a foundation pit according to any of claims 1-7, characterized in that The steel plate (2) has two layers, and one steel plate (2) overlaps at the gap between two adjacent steel plates (2) in the first layer.