阅读说明：本技术 用于隧道开挖的导向自钻式管棚钢管装置及施工方法 (Guiding self-drilling type pipe shed steel pipe device for tunnel excavation and construction method ) 是由 庞浩然 陈小星 马涛 陈博楠 王晓勇 吕祥锋 于 2021-08-11 设计创作，主要内容包括：本发明管棚支护技术领域,提供了一种用于隧道开挖的导向自钻式管棚钢管装置及施工方法,导向自钻式管棚钢管装置包括主钻头和管棚钢管；管棚钢管外周沿垂直轴线方向设置若干个加强环,相邻加强环之间沿管棚钢管轴线方向设置有楔形筋；管棚钢管内部形成注浆腔,管棚钢管的表面设置多个出浆口；主钻头与钻杆连接,主钻头通过连接件与管棚钢管的一端连接。导向自钻式管棚包括导向墙、定位点及导向自钻式管棚钢管装置。本发明的管棚钢管既能利用加强环、楔形筋与周边土层有效粘结,又能加固钢管,大大提高管棚结构与周边土层的整体性与稳定性,减小施工安全隐患；同时,本发明钻头和管棚钢管连接,减少扩孔、清孔相关工序,提高施工效率,缩短工期。(The invention relates to the technical field of pipe shed support, and provides a guide self-drilling type pipe shed steel pipe device for tunnel excavation and a construction method, wherein the guide self-drilling type pipe shed steel pipe device comprises a main drill bit and a pipe shed steel pipe; the periphery of the pipe shed steel pipe is provided with a plurality of reinforcing rings along the direction vertical to the axis, and wedge-shaped ribs are arranged between adjacent reinforcing rings along the direction of the axis of the pipe shed steel pipe; a grouting cavity is formed inside the pipe shed steel pipe, and a plurality of grout outlets are formed in the surface of the pipe shed steel pipe; the main drill bit is connected with the drill rod and is connected with one end of the pipe shed steel pipe through a connecting piece. The guide self-drilling type pipe shed comprises a guide wall, a positioning point and a guide self-drilling type pipe shed steel pipe device. The pipe shed steel pipe can be effectively bonded with the peripheral soil layer by utilizing the reinforcing rings and the wedge-shaped ribs, and can also be used for reinforcing the steel pipe, so that the integrity and the stability of the pipe shed structure and the peripheral soil layer are greatly improved, and the potential safety hazard of construction is reduced; meanwhile, the drill bit is connected with the pipe shed steel pipe, so that the related procedures of hole expansion and hole cleaning are reduced, the construction efficiency is improved, and the construction period is shortened.)

1. A guide self-drilling type pipe shed steel pipe device for tunnel excavation is characterized by comprising a main drill bit and a pipe shed steel pipe;

a plurality of reinforcing rings are arranged on the periphery of the pipe shed steel pipe along the direction vertical to the axis, and wedge-shaped ribs are arranged between adjacent reinforcing rings along the direction of the axis of the pipe shed steel pipe; a grouting cavity is formed inside the pipe shed steel pipe, and a plurality of grout outlets are formed in the surface of the pipe shed steel pipe;

the main drill bit is connected with the drill rod and is further connected with one end of the pipe shed steel pipe through a connecting piece.

2. The apparatus of claim 1, wherein the wedge rib has a barb type structure in a drilling direction of the main bit, and the reinforcing ring has a circular or polygonal ring structure.

3. The guided self-drilling shed steel pipe apparatus for tunnel excavation as claimed in claim 1, wherein the main drill bit is a spherical tooth drill, the front end of which is provided with drill bit teeth, and the rear end of which is connected with a drill pipe.

4. The apparatus of claim 1, wherein the connector has a rotary bearing therein, and when the main bit rotates, the connector and the pipe shed steel pipe do not rotate, and when the main bit drills, the connector and the pipe shed steel pipe perform a linear drilling motion along with the main bit.

5. The apparatus of claim 1, wherein the plurality of reinforcement rings are uniformly or non-uniformly arranged along the pipe axis of the pipe shed.

6. The apparatus of claim 1, wherein the plurality of the wedge-shaped ribs are uniformly or non-uniformly arranged along the circumference of the pipe shed steel pipe.

7. The apparatus of claim 6, wherein the number of the wedge-shaped ribs between the adjacent reinforcing rings is 4, and the wedge-shaped ribs are uniformly arranged along the circumference of the pipe shed steel pipe.

8. A guide self-drilling pipe shed for tunnel excavation, which is characterized by comprising a guide wall, a positioning point and a guide self-drilling pipe shed steel pipe device according to any one of claims 1 to 6;

the guide wall is uniformly provided with the positioning points, and the guide self-drilling pipe shed steel pipe device is drilled at each positioning point; and mortar is injected into the grouting cavity of the pipe shed steel pipe and overflows outwards through the mortar outlet, and the mortar at the overflow part is combined with the soil layer on the periphery of the pipe shed steel pipe into a whole.

9. The guided self-drilling pipe shed for tunnel excavation according to claim 8, wherein the guide wall is integrally arc-shaped or semicircular and is formed by casting reinforcing steel bars and concrete.

10. A construction method of a guided self-drilling pipe shed for tunnel excavation, characterized in that a guided self-drilling pipe shed steel pipe device according to any one of claims 1 to 7 is used; the method comprises the following steps:

s1, pouring a guide wall, and aligning a positioning point at the set position of the guide wall;

s2, installing a main drill bit on a drill rod, sleeving a pipe shed steel pipe, drilling, withdrawing the main drill bit from the pipe shed steel pipe after the set depth is reached, and constructing the next positioning point, so that a pipe shed structure is formed;

s3, injecting mortar into the grouting cavity of each pipe shed steel pipe, wherein the mortar flows in the grouting cavity, the mortar overflows outwards from the mortar outlet, and the mortar at the overflow position is combined with soil layers around the pipe shed steel pipes into a whole.

Technical Field

The invention relates to the technical field of pipe shed support, in particular to a guide self-drilling type pipe shed steel pipe device for tunnel excavation, a pipe shed and a construction method.

Background

In the construction process of tunnel engineering, tunnel surrounding rocks often need to be supported, and the general steps are firstly drilling and then emptying, and then pressing a steel pipe into a hole. For the soft rock tunnel, the phenomenon of hole collapse is easy to occur in the hole cleaning process, so that the construction efficiency is reduced, and the construction cost is improved. And, at present the steel pipe of conventional use is cylindrical, when pressing the steel pipe into the hole, the steel pipe is relatively poor with the bonding fastness of soil layer, the slip phenomenon appears easily. How to achieve the purpose of rapidly ensuring the quality and quantity of the built pipe shed needs to design a new pipe shed building tool.

Disclosure of Invention

The invention aims to overcome at least one of the defects of the prior art, and provides a guide self-drilling pipe shed steel pipe device for tunnel excavation, a pipe shed and a construction method aiming at the problems that the bonding firmness between a pipe shed steel pipe and a soil layer is poor and holes collapse in the hole cleaning process at present.

On one hand, the invention provides a guiding self-drilling pipe shed steel pipe device for tunnel excavation, which comprises a main drill bit and a pipe shed steel pipe;

a plurality of reinforcing rings are arranged on the periphery of the pipe shed steel pipe along the direction vertical to the axis, and wedge-shaped ribs are arranged between adjacent reinforcing rings along the direction of the axis of the pipe shed steel pipe; a grouting cavity is formed inside the pipe shed steel pipe, and a plurality of grout outlets are formed in the surface of the pipe shed steel pipe;

the main drill bit is connected with the drill rod and is connected with one end of the pipe shed steel pipe through a connecting piece.

The above-mentioned aspects and any possible implementation manner further provide an implementation manner, wherein the wedge-shaped rib is of a barb-shaped structure along the main drill bit direction, and the reinforcing ring is of a circular ring structure or a polygonal ring structure.

In accordance with the above aspect and any possible implementation manner, there is further provided an implementation manner in which the main drill bit is a button drill, the front end of the button drill is provided with drill bit teeth, and the rear end of the button drill is connected to the drill rod.

The above aspects and any possible implementation manner further provide an implementation manner, wherein a rotary bearing is arranged inside the connecting piece, when the main drill bit rotates, the connecting piece and the pipe shed steel pipe do not rotate, and when the main drill bit drills, the connecting piece and the pipe shed steel pipe both do linear drilling motion along with the main drill bit.

The above-mentioned aspects and any possible implementation further provide an implementation manner, wherein a plurality of the reinforcement rings are uniformly or non-uniformly arranged along the pipe-shed steel pipe axis.

In the aspect and any possible implementation manner described above, there is further provided an implementation manner in which a plurality of the wedge-shaped ribs are uniformly or non-uniformly arranged along the circumferential direction of the pipe shed steel pipe between adjacent reinforcement rings.

In the aspect and any possible implementation manner described above, an implementation manner is further provided, where 4 wedge-shaped ribs are uniformly arranged along the circumferential direction of the pipe shed steel pipe between adjacent reinforcement rings.

On the other hand, the invention also provides a guide self-drilling pipe shed for tunnel excavation, which comprises a guide wall, a positioning point and the guide self-drilling pipe shed steel pipe device;

the guide wall is uniformly provided with the positioning points, and the guide self-drilling pipe shed steel pipe device is drilled at each positioning point; and mortar is injected into the grouting cavity of the pipe shed steel pipe and overflows outwards through the mortar outlet, and the mortar at the overflow part is combined with the soil layer on the periphery of the pipe shed steel pipe into a whole.

The above aspects and any possible implementation further provide an implementation manner that the guide wall is integrally arc-shaped or semicircular and is formed by pouring steel bars and concrete.

The invention also provides a construction method of the guide self-drilling pipe shed for tunnel excavation, which uses the guide self-drilling pipe shed steel pipe device; the method comprises the following steps:

s1, pouring a guide wall, and aligning a positioning point at the set position of the guide wall;

s2, installing a main drill bit on a drill rod, sleeving a pipe shed steel pipe, drilling, and after the set depth is reached, withdrawing the main drill bit from the pipe shed steel pipe through a drilling machine, and then performing construction of a next positioning point to form a pipe shed structure;

s3, injecting mortar into the grouting cavity of each pipe shed steel pipe, enabling the mortar to flow in the grouting cavity, enabling the mortar to overflow outwards from the mortar outlet, and combining the mortar at the overflow position with soil layers around the pipe shed steel pipes into a whole.

The invention has the beneficial effects that: the reinforcing rings and the wedge-shaped ribs are arranged at the outer ends of the pipe shed steel pipes, so that the pipe shed steel pipes can be effectively bonded with the peripheral soil layer by the reinforcing rings and the wedge-shaped ribs and can be reinforced, the integrity and the stability of the pipe shed structure and the peripheral soil layer are greatly improved, and the potential safety hazard of construction is reduced; meanwhile, the drill bit is arranged and connected with the pipe shed steel pipe, so that the related processes of hole expanding and hole cleaning are reduced, the construction efficiency is improved, and the construction period is greatly shortened.

Drawings

Fig. 1 is a schematic structural diagram of a guiding self-drilling pipe shed steel pipe device for tunnel excavation according to an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a steel pipe device of a guide self-drilling pipe shed for tunnel excavation according to an embodiment.

Fig. 3 is a front view of the steel pipe of the pipe shed in the embodiment.

Fig. 4 is a schematic view showing the overall structure of a guided self-drilling pipe shed for tunnel excavation according to an embodiment of the present invention.

Fig. 5 is a schematic view showing a positional relationship between the guide wall and the soil (mountain) in the embodiment.

Wherein: 1-a guide wall; 2-locating points; 3-pipe shed steel pipe; 4-a main drill bit; 5-grouting cavity; 6-wedge-shaped ribs; 7-a reinforcement ring; 41-bit teeth; 42-a connector; 43-connecting screw thread; 31-a pulp outlet.

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that technical features or combinations of technical features described in the following embodiments should not be considered as being isolated, and they may be combined with each other to achieve better technical effects. In the drawings of the embodiments described below, the same reference numerals appearing in the respective drawings denote the same features or components, and may be applied to different embodiments.

As shown in fig. 1 to 3, a guided self-drilling pipe shed steel pipe device for tunnel excavation according to an embodiment of the present invention includes a main drill 4 and a pipe shed steel pipe 3; a plurality of reinforcing rings 7 are arranged on the periphery of the pipe shed steel pipe 3 along the direction vertical to the axis, and wedge-shaped ribs 6 are arranged between adjacent reinforcing rings 7 along the direction of the axis of the pipe shed steel pipe 3; a grouting cavity 5 is formed inside the pipe shed steel pipe 3, and a plurality of grout outlets 31 are formed in the surface of the pipe shed steel pipe 3; the main drill bit 4 is connected with a drill rod through a connecting thread 43, and the main drill bit 4 is further connected with one end of the pipe shed steel pipe 3 through a connecting piece 42. The function of the connecting piece 42 is: when the main bit 4 rotates, the connection member 42 and the pipe shed steel pipe 3 connected to the connection member 42 do not rotate together with the main bit 4, but when the main bit 4 drills, the connection member 42 and the pipe shed steel pipe 3 drill together with the main bit 4. The unique design can save the reaming and hole cleaning processes and improve the construction efficiency.

The effect of beaded finish 7 is that it restricts its displacement in the axial after 3 location of pipe shed steel pipe, and the effect of wedge muscle 6 is that 3 rotations along the axis of restriction pipe shed steel pipe, and the effect of beaded finish 7 and 6 combined action of wedge muscle has restricted 3 axial displacement of pipe shed steel pipe and has followed the rotation of axle, has improved the associativity of pipe shed steel pipe 3 with surrounding soil layer greatly, improves the intensity and the rigidity of pipe shed steel pipe 3 simultaneously.

Preferably, the reinforcing rings 7 are of a circular ring structure or a polygonal ring structure, and the number of the reinforcing rings is a plurality, so that the axial movement of the pipe shed steel pipes 3 is better limited; wedge muscle 6 is the barb type structure along 4 drilling directions of main drill bit, is favorable to pipe canopy steel pipe 3 to bore into the soil layer along 4 drilling directions of main drill bit, has restricted pipe canopy steel pipe 3 simultaneously and has outwards extracted along axial, further improves pipe canopy steel pipe 3's fixed fastness. Further preferably, the number of wedge muscle 6 between adjacent beaded finish 7 is a plurality ofly, for example for 4, as shown in fig. 3, 4 wedge muscle 6 be upper and lower, left and right evenly distributed at 3 outer walls of pipe shed steel pipe for pipe shed steel pipe 3 and wedge muscle 6 bear more evenly, have increased the area of contact with the soil layer simultaneously.

Preferably, the main drill 4 is a spherical tooth drill, the front end of the spherical tooth drill is provided with drill teeth 41, and the rear end of the spherical tooth drill is connected with a drill rod through a connecting thread 43; the main drill 4 is connected with the pipe shed steel pipe 3 through a connecting piece 42.

It should be noted that the reinforcing rings 7 and the wedge-shaped ribs 6 may be uniformly arranged or non-uniformly arranged, and the specific use may be determined according to the actual situation of the construction site.

As shown in fig. 4 and 5, a guiding self-drilling pipe shed for tunnel excavation according to an embodiment of the present invention includes a guiding wall 1, a positioning point 2, and the guiding self-drilling pipe shed steel pipe device as described above; the positioning points 2 are uniformly arranged on the guide wall 1, and the guide self-drilling pipe shed steel pipe device is drilled at each positioning point 2; mortar is injected into the grouting cavity 5 of the pipe shed steel pipe 3 and overflows outwards through the mortar outlet 31, and the mortar at the overflow part is combined with the soil layer around the pipe shed steel pipe 3 into a whole.

Preferably, the guide wall 1 is integrally arc-shaped or semicircular and is formed by pouring reinforcing steel bars and concrete. The positional relationship between the guide wall 1 and the soil (mountain) is shown in fig. 5.

The embodiment of the invention discloses a construction method of a guide self-drilling pipe shed for tunnel excavation, which uses the steel pipe device of the guide self-drilling pipe shed; the method comprises the following steps:

s1, pouring a guide wall 1, and aligning a positioning point 2 at a set position of the guide wall 1;

s2, installing a main drill bit 4 on a drill rod, sleeving a pipe shed steel pipe 3, drilling, and after the set depth is reached, withdrawing the main drill bit 4 from the pipe shed steel pipe 3 through a drilling machine, and then performing construction of a next positioning point to form a pipe shed structure;

s3, injecting mortar into the grouting cavity 5 of each pipe shed steel pipe 3, enabling the mortar to flow in the grouting cavity 5, enabling the mortar to overflow outwards from the mortar outlet 31, and combining the mortar at the overflow position with the soil layer around the pipe shed steel pipe 3 into a whole.

The working principle of the invention is as follows:

in practical application, pour guide wall 1 earlier, find alignment setpoint 2, install main drill bit 4 to the rig drilling rod on, sheathe in pipe shed steel pipe 3 again, drill into, after reaching the degree of depth, main drill bit 4 withdraws from pipe shed steel pipe 3 through the rig, carries out the construction of next pipe shed steel pipe 3 again to constitute a pipe shed structure. Then, mortar is injected into the grouting cavity 4 in each pipe shed steel pipe 3, the mortar flows in the grouting cavity 4, then the mortar can overflow from the mortar outlet 31, the mortar at the overflow position is combined with the soil layer around the pipe shed steel pipe 3 into a whole, the strength of the soil layer around the pipe shed steel pipe 3 is improved, in addition, because the outer end of the pipe shed steel pipe 3 is provided with the reinforcing ring 7 and the wedge-shaped rib 6, the pipe shed steel pipe 3 can be effectively bonded with the wedge-shaped rib 11 and the soil layer around the pipe shed steel pipe 3 by utilizing the reinforcing ring 10, and the pipe shed steel pipe 3 can be reinforced, so that the pipe shed structure can effectively support the soil layer above, further the integrity and the stability of the pipe shed structure and the soil layer around the pipe shed structure are greatly improved, thereby reducing the construction potential safety hazards, meanwhile, the construction method of the pipe shed increases the friction force between the pipe shed and the soil layer, effectively increases the stability of the structure, reduces the procedures of forming holes before, cleaning the holes and finally installing, the construction time is saved, and the construction efficiency is improved.

While several embodiments of the present invention have been presented herein, it will be appreciated by those skilled in the art that changes may be made to the embodiments herein without departing from the spirit of the invention. The above examples are merely illustrative and should not be taken as limiting the scope of the invention.