Tunnel inverted arch smooth blasting pneumatic blower gun counter-force device

Abstract

The utility model discloses a tunnel inverted arch smooth blasting pneumatic blower gun counter-force device which comprises a supporting system and counter-force rods, the supporting system is composed of two sets of supporting rods arranged in parallel, a plurality of counter-force rods arranged at equal intervals are vertically connected between the supporting rods, and the tail ends of the supporting rods extend to be provided with supporting rod adjusting sections. The adjusting section of the supporting rod is in threaded connection with a hollow rod body of a horizontal adjusting rod, the hollow rod body of the horizontal adjusting rod is used for adjusting the distance between the whole counter-force device and rear hole slag, and the tail end of the hollow rod body of the horizontal adjusting rod is fixedly connected with a horizontal adjusting rod base. The vertical adjusting rod nut is in threaded connection with a vertical adjusting rod body, and the vertical adjusting rod body is used for adjusting the longitudinal and transverse inclination angles of the counter-force device. By using the device, the drilling stability and precision of the pneumatic blower gun can be effectively improved, it is ensured that the hole distance and the outer inserting angle of peripheral holes meet the smooth blasting requirement, the problems of over-excavation and under-excavation of the inverted arch part are solved, and the inverted arch lining quality is improved.

Description

Technical Field

[0001] This utility model belongs to the field of civil engineering tunnel arch excavation construction technology, specifically a pneumatic air gun reaction device for smooth blasting of tunnel arches. Background Technology

[0002] With the rapid development of railway and highway tunnel construction in China, tunnel construction technology has been continuously improving. However, traditional blasting excavation techniques still present many problems during the excavation of the tunnel invert. For example, when using conventional drill-and-blast methods for invert excavation, the drilling angle of manual rock drilling rigs is difficult to control precisely, resulting in significant deviations in the external insertion angle of peripheral holes. This leads to severe over-excavation, local under-excavation, and excessive misalignment in the invert, thus affecting the structural stability and lining quality of the invert. Furthermore, traditional blasting excavation of inverts requires a large number of construction workers, resulting in low construction efficiency and significant material waste, failing to meet the requirements for high-quality and high-efficiency construction of tunnel inverts.

[0003] Smooth blasting, as an advanced blasting method, achieves a more regular excavation profile after blasting by rationally arranging peripheral holes and controlling blasting parameters, thereby reducing over-excavation and under-excavation and improving the quality of the invert lining. However, in practical applications, due to the limited excavation space of the invert, pneumatic drills (air-legged drills) are easily affected by recoil during drilling operations, leading to drill rod displacement and significant deviations in the peripheral hole positions, thus affecting the smooth blasting effect. Therefore, there is an urgent need for a device that can provide stable reaction force support to reduce displacement errors during drilling, ensure the accuracy of peripheral hole spacing and outward insertion angles, and improve the construction quality of smooth blasting. Utility Model Content

[0004] The purpose of this invention is to provide a pneumatic air gun reaction device for blasting smooth surfaces in tunnel arches, in order to solve the above-mentioned technical problems.

[0005] This utility model adopts the following technical solution: a pneumatic air gun reaction device for smooth blasting of tunnel invert arch, including a support system and reaction rods. The support system consists of two sets of parallel support rods, with several reaction rods arranged at equal intervals vertically connected between the support rods. A support rod adjustment section extends from the tail end of the support rod, and the support rod adjustment section is threadedly connected to the hollow body of a horizontal adjustment rod. The hollow body of the horizontal adjustment rod is used to adjust the distance between the reaction device as a whole and the rear muck. Its tail end is fixedly connected to the horizontal adjustment rod base. A vertical adjustment rod nut is set vertically and horizontally at the intersection of the head and tail ends of the support rod and the reaction rod. The vertical adjustment rod nut is threadedly connected to the body of the vertical adjustment rod, and the body of the vertical adjustment rod is used to adjust the longitudinal and lateral tilt angles of the reaction device.

[0006] Furthermore, the support rod is 3m long, and the distance between the two sets of support rods is 600mm.

[0007] Furthermore, six reaction bars are installed at 500mm intervals.

[0008] Furthermore, hollow anchor rods are used for the support rods and reaction rods.

[0009] Furthermore, a vertical adjustment rod handle is fixedly connected to the upper end of the vertical adjustment rod body.

[0010] This invention provides a pneumatic air gun reaction device for smooth blasting of tunnel invert arches, which can effectively solve problems such as over-excavation, under-excavation, and excessive misalignment during traditional invert arch blasting excavation. Through the coordinated action of the support system, reaction rod, and adjustment system, the device provides stable reaction force support for the pneumatic air gun drilling, keeping the drill rod horizontal during drilling, thereby precisely controlling the external insertion angle of the surrounding holes and ensuring the accuracy of the hole placement.

[0011] This device employs a combination of support rods and reaction rods, enhancing overall stability. Through the coordinated adjustment of horizontal and vertical adjustment rods, the reaction device can be adaptively adjusted under different working conditions, ensuring the accuracy of drilling operations. Applying this device can significantly improve the quality of smooth-surface blasting construction of the invert arch, reduce subsequent support and lining repair work, increase construction efficiency, and reduce material waste and construction costs. Simultaneously, this device can promptly detect quality defects such as tunnel floor heave caused by high ground stress, reducing safety and quality risks during railway or highway operation, and possesses high engineering application value. Attached Figure Description

[0012] Figure 1 This is a top view of the present invention;

[0013] Figure 2 This is a side view of the present invention.

[0014] In the diagram: 1-Support rod; 2-Reaction rod; 3-Horizontal adjusting rod nut; 4-Hollow rod body of horizontal adjusting rod; 5-Base of horizontal adjusting rod; 6-Adjusting section of support rod; 7-Vertical adjusting rod nut; 8-Rod body of vertical adjusting rod; 9-Handle of vertical adjusting rod. Detailed Implementation

[0015] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a pneumatic air gun reaction device for smooth blasting of a tunnel arch.

[0016] like Figure 1 and Figure 2As shown, a pneumatic air gun reaction device for smooth blasting of a tunnel invert arch includes a support system, reaction rods 2, and an adjustment system. The support system consists of two sets of support rods 1 arranged in parallel on both sides. The support rods 1 are made of hollow anchor rods with a length of 3m, a diameter of 25mm, and a wall thickness of 5mm. The spacing between the support rods 1 is 600mm. Several reaction rods 2 are vertically connected between the support rods 1 at equal intervals. In this embodiment, the reaction rods 2 consist of six hollow anchor rods with a diameter of 25mm, a wall thickness of 5mm, and a length of 600mm, which are welded and fixed at 500mm intervals in the middle of the support rods 1.

[0017] Adjustment systems are installed at the beginning and end of the support system to adjust the overall horizontal inclination angle of the reaction device and its distance from the rear muck. The adjustment system mainly consists of two adjusting rods. An adjusting rod with a bottom support is installed along the axis of the support rod to adjust the distance between the reaction device and the rear muck, ensuring the force balance of the reaction device. Specifically, a support rod adjusting section 6 extends from the tail end of the support rod 1. A horizontal adjusting rod hollow body 4 is installed at the rear end of the support rod adjusting section 6. A horizontal adjusting rod nut 3 is installed in the horizontal adjusting rod hollow body 4. The support rod adjusting section 6 is threadedly connected to the horizontal adjusting rod nut 3. The tail end of the horizontal adjusting rod hollow body 4 is fixedly connected to the horizontal adjusting rod base 5. Two sets of height adjustment rods are set vertically and horizontally at the intersection of the first and last ends of the support rod 1 and the reaction rod 2 to adjust the longitudinal and lateral tilt angles of the reaction device. Specifically, vertical adjustment rod nuts 7 are set vertically and horizontally at the intersection of the first and last ends of the support rod 1 and the reaction rod 2. The vertical adjustment rod nuts 7 are threadedly connected to the vertical adjustment rod body 8. The upper end of the vertical adjustment rod body 8 is fixedly connected to the vertical adjustment rod handle 9.

[0018] When in use, install the pneumatic air gun (air leg type air drill) on the reaction rod 2, and adjust the vertical adjusting rod 8 to keep the drilling angle of the drill rod horizontal. Adjust the distance between the hollow rod 4 of the horizontal adjusting rod and the back hole muck to ensure that the reaction device is balanced. Then you can start drilling.

[0019] The use of this device effectively improves the stability and accuracy of pneumatic drilling, ensuring that the spacing and external insertion angle of the surrounding holes meet the requirements of smooth blasting, reducing over-excavation and under-excavation in the invert arch, and improving the quality of the invert arch lining. At the same time, the device is simple to operate and highly adaptable, improving construction efficiency, reducing the labor intensity of construction workers, and ensuring the safety and quality stability of tunnel construction.

[0020] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A pneumatic air gun reaction device for smooth blasting of tunnel invert arches, characterized in that, The system includes a support system and a reaction rod (2). The support system consists of two sets of parallel support rods (1). Several reaction rods (2) are vertically connected between the support rods (1) and arranged at equal intervals. A support rod adjustment section (6) is provided at the tail end of the support rod (2). The support rod adjustment section (6) is threadedly connected to the hollow rod body (4) of the horizontal adjustment rod. The hollow rod body (4) of the horizontal adjustment rod is used to adjust the distance between the entire reaction device and the rear slag. Its tail end is fixedly connected to the horizontal adjustment rod base (5). A vertical adjustment rod nut (7) is set vertically and horizontally at the intersection of the head and tail ends of the support rod (1) and the reaction rod (2). The vertical adjustment rod nut (7) is threadedly connected to the vertical adjustment rod body (8). The vertical adjustment rod body (8) is used to adjust the longitudinal and lateral tilt angles of the reaction device.

2. The pneumatic air gun reaction device for smooth blasting of tunnel invert arches according to claim 1, characterized in that, The support rod (1) is 3m long, and the distance between the two sets of support rods (1) is 600mm.

3. The pneumatic air gun reaction device for smooth blasting of tunnel invert arches according to claim 2, characterized in that, The reaction rods (2) are arranged in six columns at 500mm intervals.

4. The pneumatic air gun reaction device for smooth blasting of tunnel invert arches according to claim 1, characterized in that, The support rod (1) and the reaction rod (2) are hollow anchor rods.

5. The pneumatic air gun reaction device for smooth blasting of tunnel invert arches according to any one of claims 1 to 4, characterized in that, The upper end of the vertical adjustment rod body (8) is fixedly connected to the vertical adjustment rod handle (9).

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