Advanced small guide pipe dry type construction method

Abstract

The invention relates to an advanced small conduit dry-type construction method, which realizes water-free operation and achieves the purposes of environmental protection and energy conservation. The method specifically comprises the following steps that a plurality of pre-designed hole sites are marked on a tunnel face according to designed hole sites; at each hole position of the tunnel face, according to the designed diameter, angle and depth, a stand column type pneumatic dry drilling machine is adopted for hole forming, after drilling is completed, a drilling rod is withdrawn, and meanwhile a small guide pipe is jacked into a drilled hole; the stand column type pneumatic dry drilling machine is moved to the next marked hole site, and the steps are repeated till construction of the hole site is completed; and advanced small guide pipe jump hole grouting is conducted.

Description

Technical Field

[0001] The invention relates to the field of tunnel construction, in particular to a construction method of an advanced small conduit, and more specifically to a dry construction method of an advanced small conduit. Background Art

[0002] In the prior art, the construction of the small pipe ahead of the dry tunnel is usually carried out by adding water to the hole with a pneumatic rock drill, and then pushing the small pipe into the hole. The small pipe ahead process is usually constructed by two pneumatic rock drills at the same time. In order to prevent the drill rod from getting stuck during the hole-pushing process, water must be added throughout the process to assist in slag removal. After the hole-pushing process is completed, the small pipe is pushed into each hole. Due to the water sensitivity of loess, if water is added during the drilling process, the addition of water will inevitably cause the soil around the small pipe ahead to become muddy and wet, causing the physical properties of the loess to change, and the base will be soaked to pollute the working surface, interfering with the subsequent construction. It can be seen that the construction method of adding water to the small pipe ahead to pull the hole causes cutting damage to the soil around the tunnel excavation contour line. In the subsequent excavation process, the soil below the small pipe is easy to fall off, causing it to fall off or even cause collapse, which not only increases the safety risk of tunnel excavation, but also directly leads to the subsequent over-consumption of shotcrete and the extension of the shotcrete process time, increasing the tunnel construction cycle time, which is not conducive to the fast closure construction of the tunnel.

[0003] Therefore, it is an urgent problem to be solved in the industry to provide an advanced small-conduct dry construction method suitable for loess tunnels, which can not only avoid the destruction of stratum stability by artificial water use, but also save the time of advanced support process, realize waterless operation, and achieve the purpose of environmental protection and energy saving. Summary of the invention

[0004] In view of the above problems, one of the objects of the present invention is to provide an advanced small-conductor dry construction method to realize waterless operation. The method adjusts and improves the advanced small-conductor hole-making process, tooling and construction procedures suitable for loess tunnels, so that drilling and jacking can be carried out simultaneously. It can save the time of the advanced support process while avoiding the destruction of the stability of the formation by artificial water use, reduce the risk of falling blocks during excavation, and save the time for hardening the working surface and base treatment.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present invention provides an advanced small-pipe waterless construction method, which comprises the following steps:

[0007] (1) Mark several pre-designed hole positions on the tunnel face;

[0008] (2) installing a column-type pneumatic dry drilling rig at one of the hole positions on the face;

[0009] (3) according to the designed angle and depth, use the column-type pneumatic dry drilling rig to drill holes one by one to the designed depth;

[0010] (4) After the drilling is completed, the drill rod is withdrawn and a small guide tube is pushed into the drill hole;

[0011] (5) moving the column-type pneumatic dry drilling machine to the next marked hole position, and repeating steps (2) to (4) until the construction of all hole positions is completed;

[0012] (6) Carry out advance small-tube jump-hole grouting.

[0013] It can be seen that the advance small-conduct dry construction method provided by the present invention enables the loess tunnel to realize the rapid construction of the advance small-conduct under waterless conditions, which not only avoids the softening of the soil around the tunnel excavation contour line due to water drilling construction, thereby not damaging the loess structure itself, but also avoids the falling and sliding of the soil under the advance small-conduct due to the addition of water during the subsequent excavation process, thereby ensuring the safety of the excavation operation and saving the time for hardening the working surface and base treatment.

[0014] In some embodiments, in step (2), the column-type pneumatic dry drilling rig is set to be able to adjust the construction height and angle.

[0015] In some embodiments, in step (2), at least two column-type pneumatic dry drilling rigs are placed at the tunnel face to perform simultaneous construction.

[0016] In some embodiments, in step (3), the supporting power system of the column-type pneumatic dry drilling rig is set to pneumatic, electric or hydraulic transmission.

[0017] In some embodiments, in step (3), the hollow spiral drill rod of the column-type pneumatic dry drilling rig is used in conjunction with high-pressure air to remove slag.

[0018] In some embodiments, in step (3), the column-type pneumatic dry drill is used independently, or is used in conjunction with a stand, or is used in conjunction with large-scale mechanical equipment.

[0019] In some embodiments, in step (3), the hole diameter of the hollow spiral drill rod is set to 42 mm, 50 mm or 60 mm, and can also be adjusted according to the designed diameter.

[0020] In some embodiments, the drilling depth is set to a single drilling length of 1.5 m, 2 m, 2.5 m or 3 m.

[0021] In some embodiments, the advanced small-conductor dry construction method is applied to loess tunnels or soft rock tunnels.

[0022] By adopting the above technical scheme, the present invention at least achieves the following technical effects: (1) by upgrading the water drilling process of the pneumatic rock drill to pneumatic drilling, the hollow spiral drill rod is combined with high-pressure air to remove slag, and the drilling and jacking are carried out simultaneously, so as to realize the rapid construction of the advanced small guide tube under waterless conditions, avoid the damage of water to the loess geology, and complete the advanced support process quickly and safely, thereby reducing the construction safety risk; (2) the excavation safety risk is reduced, the falling of blocks or collapse is reduced, and the time for hardening the working surface and treating the base is saved; (3) the drilling and jacking are carried out simultaneously, and the rapid construction process of the advanced small guide tube is realized; (4) it complies with the construction principle of fast excavation, fast support, and fast closure of the loess tunnel, thereby reducing the risk of tunnel construction; (5) the construction water is reduced, and the pollution of the working surface and the softening of the tunnel base by water are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the steps of the advanced small-duct dry construction method of the present invention is shown. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the system or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc., are used to define components, only for the convenience of distinguishing the above components, and unless otherwise stated, the above terms have no special meanings and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] Next, the advanced small-duct waterless construction method of the present invention will be described in detail with reference to the accompanying drawings.

[0028] As a non-limiting embodiment, Figure 1 As shown, the advanced small-conductor waterless construction method provided by the present invention, first, in step S1, mark a plurality of pre-designed hole positions on the face. Then, in step S2, install a column-type pneumatic dry drilling rig in sequence at one of the hole positions on the face. Subsequently, in step S3, according to the designed angle and depth, use the column-type pneumatic dry drilling rig to drill holes one by one to the designed depth. Next, in step S4, after the drilling is completed, the drill rod is withdrawn, and a small conduit is pushed into the borehole at the same time. In step S5, move the column-type pneumatic dry drilling rig to the next marked hole position, and repeat steps S2 to S4 until the construction of the hole position is completed. Finally, in step S6, the advanced small-conductor jump hole grouting is performed.

[0029] Specifically, first, before the construction of the advanced small duct, the construction site, high-pressure wind, electricity, material and other pipelines are prepared. Then, after the circulation primary support steel frame is installed in place, the column-type pneumatic dry drilling rig that can flexibly adjust the construction height and angle is put in place, and 3 sets of equipment can be placed on the face for simultaneous construction. The column-type pneumatic dry drilling rig is not only light in tooling, but also the drilling angle can be flexibly adjusted, and the drilling accuracy can be effectively guaranteed. Then, according to the designed angle and depth, drill each hole to the designed depth, withdraw the drill, and push the small duct in at the same time. Then, move the machine to construct the next hole until the construction of all the advanced ducts is completed. Finally, perform the advanced small duct jump hole grouting.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An advanced small-duct dry construction method, characterized in that: The steps include: (1) Mark several pre-designed hole positions on the tunnel face; (2) installing a column-type pneumatic dry drilling rig at one of the hole positions on the face; (3) according to the designed angle and depth, use the column-type pneumatic dry drilling rig to drill holes one by one to the designed depth; (4) After the drilling is completed, the drill rod is withdrawn and a small guide tube is pushed into the drill hole; (5) moving the column-type pneumatic dry drilling machine to the next marked hole position, and repeating steps (2) to (4) until the construction of all hole positions is completed; and (6) Carry out advance small-tube jump-hole grouting.

2. The advanced small-pipe dry construction method according to claim 1 is characterized in that: In step (2), the column-type pneumatic dry drilling rig is set to be able to adjust the construction height and angle.

3. The advanced small-pipe dry construction method according to claim 1 is characterized in that: In step (2), at least two of the column-type pneumatic dry drilling rigs are placed at the tunnel face to perform construction simultaneously.

4. The loess tunnel advanced small-pipe dry construction method according to claim 1 is characterized in that: In step (3), the supporting power system of the column-type pneumatic dry drilling rig is set to pneumatic, electric or hydraulic transmission.

5. The advanced small-pipe dry construction method according to claim 1 is characterized in that: In step (3), the hollow spiral drill rod of the column-type pneumatic dry drilling rig is used in conjunction with high-pressure air to remove slag.

6. The advanced small-pipe dry construction method according to claim 1 is characterized in that: In step (3), the column-type pneumatic dry drilling rig is used independently, or is used in conjunction with a stand, or is used in conjunction with large-scale mechanical equipment.

7. The advanced small-pipe dry construction method according to claim 5 is characterized in that: In step (3), the hole diameter of the hollow spiral drill rod is set to 42 mm, 50 mm or 60 mm, and can also be adjusted according to the designed diameter.

8. The advanced small-pipe dry construction method according to claim 1 is characterized in that: In step (3), the drilling depth is set to a single drilling length of 1.5 m, 2 m, 2.5 m or 3 m.

9. The advanced small-pipe dry construction method according to claim 1, characterized in that: The advanced small-conducting tube waterless construction method is applied to loess tunnels or soft rock tunnels.

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