Pipe shed occlusion device for weak surrounding rock tunnel portal section

Abstract

The utility model relates to a weak surrounding rock tunnel portal section pipe shed occlusion device which comprises a plurality of shed pipes which are arranged at intervals along the designed section of a tunnel portal, and the circumferential outer wall of each shed pipe is provided with a first profile steel connector, a pair of second profile steel connectors and a rubber air bag strip with an inflation nozzle. The pair of second profile steel joints are symmetrically arranged at intervals and form positioning sliding grooves for containing the rubber air bag strips, and the first profile steel joints are inserted into the positioning sliding grooves of the adjacent shed pipes in a clearance mode, are limited by the second profile steel joints and can slide and be separated along openings in the two ends of the positioning sliding grooves; after inflation, the rubber air bag strip tightly abuts against the surface of the first profile steel connector so as to force the inserting end of the first profile steel connector to abut against the inner wall of the second profile steel connector. Through ingenious combination of a section steel occlusion system and air bag type rubber, the problems that in the prior art, a pipe shed is inaccurate in positioning, poor in stability and the like are effectively solved, and a safer and more reliable supporting scheme is provided for tunnel construction.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel construction, in particular to a pipe-roof bite device for a soft surrounding rock tunnel portal section. Background Art

[0002] The tunnel construction environment is relatively complex, with a large number of soft surrounding rock geology and large differences in surrounding rock weathering, which has a certain impact on the stability of the tunnel entrance. Problems such as block falling and collapse are very likely to occur during excavation, which not only increases the difficulty of tunnel construction, but also leaves safety hazards to a certain extent.

[0003] Pipe-roof advance support is widely used in soft and broken strata such as highway tunnel entrances and exits. It is usually set up along the tunnel depth direction at a certain circumferential spacing according to the tunnel design section before tunnel excavation. The pipe-roof uses the steel arch frame in front of the face and the surrounding rock behind as support points, effectively controlling the deformation of the surrounding rock. In addition, cement slurry is pressed into the cracks of the surrounding rock through the pipe wall holes, thereby achieving the purpose of cementing and reinforcing the surrounding rock and improving the physical and mechanical properties of the weak surrounding rock.

[0004] The existing full-section boundary advance pipe scaffolding for extremely soft and weak surrounding rock tunnels usually accurately determines the plane position, inclination, and external insertion angle of the hole before drilling, and numbers each hole. The determination of the drilling elevation angle should be determined according to the drilling depth and the strength of the drill rod. The scaffolding needs to ensure stability in the soft and broken surrounding rock tunnel project, avoid collapse in the tunnel, and reduce the danger during construction. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a pipe-roof bite device for the entrance section of a soft surrounding rock tunnel in view of the above-mentioned deficiencies in the prior art. The device adopts a steel bite system and combines airbag rubber to limit the position between the pipe sheds. While not affecting the jacking of the pipe sheds, it is beneficial to improve the accuracy and stability of the positioning of the pipe shed, thereby ensuring the overall support capacity and safe construction of the pipe shed.

[0006] The above utility model object of the utility model is achieved through the following technical solutions:

[0007] A pipe-roof engagement device for a tunnel portal section with weak surrounding rocks comprises a plurality of roof pipes arranged at intervals from each other along the designed section of the tunnel portal, wherein the circumferential outer wall of the roof pipe is provided with a first steel joint, a pair of second steel joints, and a rubber airbag strip with an inflation nozzle; the pair of second steel joints are arranged symmetrically at intervals and form a positioning slide groove for accommodating the rubber airbag strip, the first steel joint is inserted into the positioning slide groove of the adjacent roof pipe with a gap and is limited by the second steel joint, and can be slid and disengaged along the openings at both ends of the positioning slide groove; after inflation, the rubber airbag strip is tightly in contact with the surface of the first steel joint to force the plug-in end of the first steel joint to contact the inner wall of the second steel joint.

[0008] By adopting the above technical scheme, on the basis of the existing pipe-roof layout, a temporary connection bite system is formed by using the first steel joint and the second steel joint, which not only provides a stable installation space for the rubber airbag strip, but also ensures the accurate positioning and limiting of the first steel joint. The rubber airbag strip is introduced and inflated by the inflation nozzle to make it fit tightly to the surface of the first steel joint, and push the plug-in end of the first steel joint to tightly contact the inner wall of the second steel joint, thereby realizing seamless bite between the roof pipes. This airbag rubber limiting method can not only effectively resist the extrusion and deformation of the surrounding rock, but also absorb the vibration and impact during the construction process to a certain extent, protect the overall stability of the pipe-roof system, and further enhance the connection strength and stability between the pipe-roofs, so that the entire pipe-roof system shows higher deformation resistance and bearing performance in a weak surrounding rock environment. In summary, through the ingenious combination of the steel bite system and the airbag rubber, the problems of inaccurate positioning and poor stability of the pipe-roof in the prior art are effectively solved, providing a safer and more reliable support scheme for tunnel construction.

[0009] The utility model is further configured as follows: the first steel joint and the second steel joint are respectively arranged on two opposite sides of the shelf pipe.

[0010] By adopting the above technical solution, the installation and disassembly of the shelf pipes are facilitated.

[0011] The utility model is further configured as follows: the first steel joint is an I-beam, the second steel joint is a channel steel, and the cross section of the positioning slide groove is cross-shaped.

[0012] By adopting the above technical solution, the first steel joint adopts an I-beam design, and its unique cross-sectional shape enables it to effectively disperse stress when subjected to force, avoiding damage caused by local stress concentration. The second steel joint uses channel steel, which cooperates with the I-beam to form a stable cross-shaped positioning groove, which not only provides a stable installation space for the rubber airbag strip, but also ensures the accurate positioning and limiting of the first steel joint.

[0013] The utility model is further configured as follows: a plurality of flexible convex strips are arranged on the circumferential outer wall of the rubber airbag strip.

[0014] By adopting the above technical solution, the flexible convex strips can further improve the stability of the bite device. After inflation, these convex strips can be tightly embedded in the surface of the first steel joint to form multi-point contact, effectively preventing gas leakage and slippage.

[0015] The utility model is further configured as follows: the cross section of the convex strip is approximately trapezoidal, and the longitudinal cross-sectional area of ​​the convex strip gradually decreases in the direction away from the rubber airbag strip.

[0016] By adopting the above technical solution, the trapezoidal cross-section design of the convex strip enables it to gradually disperse the stress when subjected to force, thereby enhancing the compression and shear resistance of the rubber airbag strip.

[0017] The utility model is further configured as follows: the inflation nozzle is configured as an inflation and deflation valve.

[0018] By adopting the above technical solution, not only is the operation of the construction workers convenient, but the rubber airbag strips can also be quickly deflated when necessary to facilitate the disassembly and reuse of the pipe shed.

[0019] The utility model is further configured as follows: two ends of the rubber airbag strip are respectively bent to form flanges, and the flanges abut against end surfaces of the first steel joint and a pair of second steel joints.

[0020] By adopting the above technical solution, double protection is provided for the limiting of the first steel joint and the second steel end, further improving the overall performance of the pipe-roof engagement device.

[0021] The utility model is further configured as follows: the flange extends toward one side of the first steel joint and forms a pair of clamping parts, and the pair of clamping parts respectively abut against two sides of the first steel joint.

[0022] By adopting the above technical solution, double protection is provided for the stable connection of the first steel joint, further improving the overall performance of the pipe-roof bite device.

[0023] In summary, the beneficial technical effect of the utility model is: through the ingenious combination of the steel bite system and the airbag rubber, the problems of inaccurate pipe shed positioning and poor stability in the prior art are effectively solved, providing a safer and more reliable support solution for tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a structural schematic diagram of a pipe-roof engaging device for a soft surrounding rock tunnel portal section.

[0025] Figure 2 It is a partial schematic diagram of the pipe-roof engaging device for the soft surrounding rock tunnel portal section of the utility model.

[0026] Figure 3 It is a schematic diagram of the connection relationship between two adjacent shelf pipes of the utility model.

[0027] Figure 4 It is a schematic diagram of the connection relationship between the first steel joint, the second steel joint and the rubber airbag strip of the utility model.

[0028] In the figure, 1, shed pipe; 2, first steel joint; 3, second steel joint; 31, positioning slide groove; 4, rubber airbag strip; 41, inflation nozzle; 42, flange; 43, clamping part; 44, convex strip. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and functions achieved by the present invention clearer and easier to understand, the present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0030] Reference Figure 1 , a pipe-roof bite device for a tunnel portal section in a soft surrounding rock disclosed in the utility model, comprises a plurality of shed pipes 1 arranged at intervals along the design section of the tunnel portal, and a first steel joint 2, a pair of second steel joints 3 and a rubber airbag strip 4 with an inflation nozzle 41 arranged on the circumferential outer wall of the shed pipe 1. The first steel joint 2 and the second steel joint 3 are respectively arranged on opposite sides of the shed pipe 1, and are initially limited by gap bite, and the rubber airbag strip 4 can achieve seamless bite by abutting and pressing after inflation.

[0031] Reference Figure 1 and Figure 3 Preferably, the first steel joint 2 is an I-beam, and the second steel joint 3 is a channel steel. The second steel joints 3 are symmetrically arranged at intervals to form a positioning slot 31 for accommodating the rubber airbag strip 4. The cross section of the positioning slot 31 is cross-shaped. The first steel joint 2 is inserted into the positioning slot 31 of the adjacent shed pipe 1 with a gap and is limited by the second steel joint 3, and can be slid and disengaged along the openings at both ends of the positioning slot 31. The first steel joint 2 is designed with an I-beam, and its unique cross-sectional shape enables it to effectively disperse stress when subjected to force, avoiding damage caused by local stress concentration, while the second steel joint 3 is made of channel steel, which cooperates with the I-beam to form a stable cross-shaped positioning slot 31, which not only provides a stable installation space for the rubber airbag strip 4, but also ensures the accurate positioning and limiting of the first steel joint 2.

[0032] Reference Figure 2 and Figure 3The two ends of the rubber airbag strip 4 are bent to form flanges 42, which extend toward one side of the first steel joint 2 and form a pair of clamping parts 43. The inflation nozzle 41 is set as an inflation and deflation valve. After inflation, the rubber airbag strip 4 is tightly in contact with the surface of the first steel joint 2 to force the plug-in end of the first steel joint 2 to contact the inner wall of the second steel joint 3. The flange 42 contacts the end faces of the first steel joint 2 and a pair of second steel joints 3, and the pair of clamping parts 43 contact the two sides of the first steel joint 2 respectively. This structure provides double protection for the limiting and stable connection of the first steel joint 2 and the second steel end, further improving the overall performance of the pipe-roof bite device. The inflation and deflation valve not only facilitates the operation of the construction personnel, but also can quickly deflate the rubber airbag strip 4 when necessary, so as to facilitate the disassembly and reuse of the pipe-roof.

[0033] Reference Figure 3 and Figure 4 The circumferential outer wall of the rubber airbag strip 4 is provided with a plurality of flexible convex strips 44, the cross section of which is approximately trapezoidal, and the longitudinal cross-sectional area of ​​the convex strip 44 gradually decreases in the direction away from the rubber airbag strip 4. The flexible convex strips 44 can further improve the stability of the bite device. After inflation, these convex strips 44 can be tightly embedded in the surface of the first steel joint 2 to form multi-point contact, effectively preventing gas leakage and slippage. The trapezoidal cross-sectional design of the convex strip 44 enables it to gradually disperse stress when subjected to force, thereby enhancing the compression and shear resistance of the rubber airbag strip 4.

[0034] The implementation principle of this embodiment is as follows: on the basis of the existing pipe-roof layout, a temporary connection bite system is formed by using the first steel joint 2 and the second steel joint 3, which not only provides a stable installation space for the rubber airbag strip 4, but also ensures the accurate positioning and limiting of the first steel joint 2, and introduces the rubber airbag strip 4, and inflates the rubber airbag strip 4 through the inflation nozzle 41, so that it fits tightly to the surface of the first steel joint 2, and pushes the plug-in end of the first steel joint 2 to tightly contact the inner wall of the second steel joint 3, thereby realizing seamless bite between the shed pipes 1. This airbag rubber limiting method can not only effectively resist the extrusion and deformation of the surrounding rock, but also absorb the vibration and impact during the construction process to a certain extent, protect the overall stability of the pipe-roof system, and further enhance the connection strength and stability between the pipe-roofs, so that the entire pipe-roof system shows higher deformation resistance and bearing performance in a weak surrounding rock environment; in summary, through the ingenious combination of the steel bite system and the airbag rubber, the problems of inaccurate positioning and poor stability of the pipe-roof in the prior art are effectively solved, providing a safer and more reliable support solution for tunnel construction.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A pipe-roof engagement device for a soft rock tunnel portal section, comprising a plurality of pipe-roofs (1) arranged at intervals from one another along a designed section of the tunnel portal, characterized in that: The circumferential outer wall of the scaffolding pipe (1) is provided with a first steel joint (2), a pair of second steel joints (3), and a rubber airbag strip (4) with an inflation nozzle (41); the pair of second steel joints (3) are arranged symmetrically at intervals and form a positioning slide groove (31) for accommodating the rubber airbag strip (4); the first steel joint (2) is inserted into the positioning slide groove (31) of the adjacent scaffolding pipe (1) with a gap and is limited by the second steel joint (3) and can be slid and separated along the openings at both ends of the positioning slide groove (31); after inflation, the rubber airbag strip (4) is tightly in contact with the surface of the first steel joint (2) to force the plug-in end of the first steel joint (2) to contact the inner wall of the second steel joint (3).

2. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 1 is characterized in that: The first steel joint (2) and the second steel joint (3) are respectively arranged on two opposite sides of the shelf pipe (1).

3. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 1 is characterized in that: The first steel joint (2) is an I-beam, the second steel joint (3) is a channel steel, and the cross section of the positioning slide groove (31) is cross-shaped.

4. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 1 is characterized in that: The circumferential outer wall of the rubber airbag strip (4) is provided with a plurality of flexible convex strips (44).

5. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 4 is characterized in that: The cross section of the convex strip (44) is approximately trapezoidal, and the longitudinal cross-sectional area of ​​the convex strip (44) gradually decreases in a direction away from the rubber airbag strip (4).

6. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 1 is characterized in that: The inflation nozzle (41) is configured as an inflation and deflation valve.

7. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 1 is characterized in that: The two ends of the rubber airbag strip (4) are respectively bent to form flanges (42), and the flanges (42) are in contact with the end faces of the first steel joint (2) and a pair of second steel joints (3).

8. The pipe-roof engagement device for the soft surrounding rock tunnel portal section according to claim 7, characterized in that: The flange (42) extends toward one side of the first steel joint (2) and forms a pair of clamping portions (43), and the pair of clamping portions (43) respectively abut against two sides of the first steel joint (2).

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