CN205206826U - Tunnel face blast construction system - Google Patents

Abstract

The utility model relates to a tunnel face blasting construction system. The device part is mainly a projection device and a benchmark device. The projection device includes a projection bracket, and a projector and a positioning compass are respectively arranged on the projection bracket, and the projection direction of the projector is adjusted by an adjustment knob; The template is located in front of the projector, and the light emitted by the projector passes through the blasthole template and the image is projected onto the palm surface to determine the blasthole position. By designing a brand-new structure, the device can use projection equipment to realize accurate projection of the position of the blast hole on the face of the tunnel.

Description

A tunnel face blasting construction system

technical field

The utility model relates to the technical equipment field related to civil engineering, in particular to a tunnel face blasting construction system.

Background technique

In most tunnels in my country, the drilling and blasting method is usually used for construction, and the drilling and blasting method realizes rock excavation through drilling, charging, and blasting. Before drilling, the contour line of the blasthole must be drawn on the excavation surface, and the location of the blasthole should be arranged according to the drilling and blasting parameter diagram. Among them, the cutting hole spacing in the blast hole, the auxiliary hole row spacing and row spacing, and the surrounding hole spacing must be determined according to the drilling and blasting parameters.

The layout of blastholes in drilling and blasting directly affects the quality of blasting, and improper blasting design can easily lead to overbreak and underbreak.

However, in the blasting operation of the tunnel face, empirical methods are often used to design the number of blastholes and the layout of blastholes on the tunnel face, which often leads to over- and under-excavation of the surrounding rock mass of the tunnel and deviation of the tunnel alignment from the designed route.

The above blasting disadvantages not only slow down the construction progress but also increase the construction cost.

Therefore, it is necessary to design a device that can quickly and efficiently determine the precise position of the blast hole on the face of the tunnel to solve the above problems.

Utility model content

The purpose of this utility model is to provide a tunnel face blasting construction system in order to overcome the above-mentioned deficiencies in the prior art. By designing a brand-new structure, the device can use projection equipment to realize accurate projection of the position of the blast hole on the face of the tunnel.

In order to achieve the above object, the utility model adopts the following technical solutions:

A tunnel face blasting construction system, comprising:

Projection device and benchmarking device, the two devices are connected through a connecting pipe;

The projection device includes a projection bracket on which a projector and a positioning compass are respectively arranged, and the projection direction of the projector is adjusted by an adjustment knob;

A blasthole template is arranged on the projection bracket, and the blasthole template is located in front of the projector. After the light emitted by the projector passes through the blasthole template, the image is projected onto the palm surface to determine the position of the blasthole.

Preferably, the projection support also has a vial.

Preferably, the pole device includes a pole bracket, and a prism is arranged on the pole bracket.

Preferably, the benchmark bracket also has a vial.

While providing the above-mentioned construction system, the utility model also provides a method for using the above-mentioned construction system to determine the position of the blast hole, which mainly includes the following steps:

A. Determine three points on the boundary line between the tunnel side wall and the ground;

B. Draw arcs with three points as the center and a line segment larger than the tunnel radius and smaller than the diameter as the radius, so that the three arcs intersect in pairs;

C, the intersecting points obtained by connecting the circular arcs inside the tunnel, making the obtained line segment intersect with the pairwise connecting lines of the three points in step A to obtain two intersecting points located on the center line of the tunnel, and connecting the two intersecting points, namely is the center line of the tunnel;

D. Arrange the projection device and the benchmark device on the center line of the tunnel;

F. Use the benchmarking device to confirm that the laser emitted by the projection device is parallel to the center line of the tunnel;

G. Remove the benchmark device, and use the projector to project the blasthole layout on the blasthole template onto the tunnel face.

Preferably, the three points in step A are not on a straight line.

Preferably, after step C is completed, the two devices are placed on the same level through the connecting pipe, and then step D is performed.

The beneficial effect that the utility model has is:

It can quickly and easily locate the blasthole layout on the tunnel face, solve the over-excavation and under-excavation phenomena in tunnel construction caused by improper blasthole layout, and effectively improve the construction accuracy of tunnel blasting and excavation. It is low in cost and easy to use.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a schematic diagram of positioning the center line of the tunnel in the utility model;

Fig. 3 is a schematic diagram of projection of blasthole images in the utility model;

Fig. 4 is a structural schematic diagram of the projection device;

Figure 5 Schematic diagram of the structure of the benchmarking device;

Among them: 1. Projection device, 2. Benchmark device, 3. Setting blast holes, 4. Tunnel centerline, 5. Connecting pipe;

6. Arc, 7. Midline point, 8. Boundary point;

9. Projector lamps, 10. Blast hole templates, 11. Tunnel face;

12. Projector, 13. Positioning compass, 14. Adjustment knob, 15. Level bubble, 16. Projection bracket;

17, circular prism, 18, auxiliary support, 19, vial, 20, main support.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings.

Embodiment: a tunnel face blasting construction system, its structure as shown in Figures 1, 3, 4 and 5: comprising a projection device 1 and a benchmark device 2, the projection device 1 and the benchmark device 2 are connected through a connecting pipe 5;

The projection device 1 includes a projection bracket 16, on which a projector 12, a positioning compass 13 and a vial 15 are respectively arranged, and the projection direction of the projector 12 is adjusted by an adjustment knob 14, and the projector has a projection lamp 9;

A blasthole template 10 is provided in front of the projector 12, and the blasthole template 10 has a designed blasthole.

The connecting pipe 5 can be selected as a connecting hose.

The benchmarking device 2 includes a benchmarking bracket on which a circular prism 17 and a vial 19 are arranged. The benchmark support is made up of main support 20 and auxiliary support 18, and the two cooperate to realize the adjustment of height.

Referring to Fig. 2, the utility model also provides a method for determining the position of the blast hole by using the above-mentioned construction system, specifically:

Determine three boundary points 8 on the interface between the tunnel side wall and the ground, and the three boundary points 8 cannot be on the same straight line;

Then, take the three boundary points 8 as the center and draw a circular arc with a line segment larger than the tunnel radius and smaller than the diameter as the radius, so that the three circular arcs intersect in pairs;

The intersection points obtained by connecting the two pairs of arcs 6 inside the tunnel, the two obtained line segments respectively intersect with the connection line between the determined points, and the two centerline points 7 finally obtained are located on the tunnel centerline, and the two centerline points 7 are connected After that, the position of tunnel center line 4 can be determined;

On the premise of determining the position of the center line of the tunnel, the projection device 1 and the benchmark device 2 are leveled and arranged on the center line of the tunnel, and the height of the liquid level in the connecting pipe 5 is observed, and then the two are adjusted so that the top surface of the projection bracket 16 and the main The top surface of the bracket 20 is on the same horizontal plane;

Utilize the laser head that projector 12 carries, hit laser, make the bull's-eye of the circular prism right in the center of the laser beam. The reason for completing this step is: the laser beam is regarded as a straight line, and the center of the tunnel is also regarded as a straight line. When the laser beam hits the target, the laser beam can just form a plane with the center line of the tunnel, and the extension line of the laser beam and the tunnel After the extension line of the center line is infinitely extended, the two cannot intersect, so as to ensure that the projection reverse of the projector 12 is very close to the set projection direction.

After the above steps are completed, the benchmarking device 2 is removed, the projection lamp 9 is turned on and the pre-designed blasthole template 10 is assembled, then the light emitted by the projector 12 passes through the blasthole template 10 and is projected onto the tunnel face 11 in an enlarged form. superior. The position of the blasthole on the image is the best position to set the blasthole 3.

It should be noted that, when the tunnel is a curved tunnel, it is necessary to properly adjust the projection direction of the projector 12 according to the position of the tunnel where the projector 12 is located and the direction of the tunnel to realize curved blasting.

After adopting the above-mentioned structure and method, the device can quickly and efficiently realize the projection of the designed blasthole position, and through the precise positioning system, the blasthole layout can be conveniently and quickly positioned on the tunnel face to improve the blasting quality.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to the embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. The part that is described in detail and partially enlarged and presented is the prior art, and will not be repeated here. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and characteristics disclosed herein.

Claims (4)

1. a tunnel tunnel face blast working system, is characterized in that, comprising:

Projection arrangement and sign post device, stream oriented device was connected by communicating pipe;

Described projection arrangement comprises projection bracket, projection bracket is respectively equipped with projector and bearing compass, and described projector is conditioned knob and regulates projecting direction;

Projection bracket is provided with borehole template, and borehole template is positioned at the front of projector.

2. tunnel tunnel face blast working system according to claim 1, is characterized in that described projection bracket also has air level.

3. tunnel tunnel face blast working system according to claim 1, it is characterized in that, described sign post device comprises mark post support, and mark post support is provided with prism.

4. tunnel tunnel face blast working system according to claim 3, is characterized in that, described mark post support also has air level.