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CN-122015605-A - Supporting and isolating device for tunnel blasting tunneling and construction method

CN122015605ACN 122015605 ACN122015605 ACN 122015605ACN-122015605-A

Abstract

The invention discloses a supporting isolation device for tunnel blasting tunneling and a construction method, which comprise a fixed base, a supporting upright post, a connecting node, a cantilever connecting base, a top cantilever, an inclined strut and a triangular supporting structure, wherein the fixed base is arranged on a track foundation of a tunnel tunneling surface and is used for providing bottom support, the supporting upright post is vertically fixed at the top of the fixed base, the connecting node is fixed at the middle upper area of the supporting upright post, the cantilever connecting base is fixed at the top end of the supporting upright post, one end of the top cantilever is hinged to the cantilever connecting base, the other end of the top cantilever extends towards the tunnel section, one end of the inclined strut is hinged to the connecting node, the other end of the inclined strut is hinged to the lower surface of the top cantilever, and the inclined strut forms the triangular supporting structure with the supporting upright post and the top cantilever. According to the supporting isolation device and the construction method, the supporting isolation effect in the blasting tunneling of the tunnel can be effectively improved, the arc-shaped isolation plate is arranged to be matched with the arc-shaped inner wall of the tunnel, flying stones and shock waves generated by blasting can be better blocked, and the protection comprehensiveness is improved.

Inventors

  • FU XIAOYU
  • LI SHOUWEN
  • XIAO JUN
  • TANG XIAO
  • WANG FEI
  • Dai Cunsheng
  • QING PENG
  • GAO YI

Assignees

  • 中建二局第一建筑工程有限公司
  • 中国建筑第二工程局有限公司

Dates

Publication Date
20260512
Application Date
20260324

Claims (10)

  1. 1. A supporting and isolating device for blasting tunneling of a tunnel, comprising: the fixed base (1) is arranged on the track foundation of the tunneling surface and is used for providing bottom support; The support upright post (2) is vertically fixed at the top of the fixed base (1); The connecting node (3) is fixed in the middle upper area of the supporting upright post (2); the cantilever connecting seat (4) is fixed at the top end of the supporting upright post (2); a top cantilever (6), one end of which is hinged with the cantilever connecting seat (4), and the other end extends towards the section of the tunnel; One end of the diagonal brace (5) is hinged to the connecting node (3), the other end of the diagonal brace is hinged to the lower surface of the top cantilever (6), and the diagonal brace (5), the supporting upright (2) and the top cantilever (6) form a triangular supporting structure; the hoisting assembly (7) is hung at the extending end of the top cantilever (6); Arc division board (8), adaptation tunnel inner wall's arc profile, its both sides edge respectively with support post (2), connected node (3), cantilever connecting seat (4), diagonal brace (5) fixed connection, arc division board (8) top edge with top cantilever (6) fixed connection.
  2. 2. The supporting and isolating device for tunnel blasting tunneling of claim 1, wherein the fixed base (1) is of a reinforced concrete pouring structure, a clamping groove matched with a tunnel track is formed in the bottom of the fixed base (1), an anti-slip rubber pad is arranged on the inner wall of the clamping groove, and the fixed base (1) is fixedly connected with the tunnel track.
  3. 3. The supporting and isolating device for tunnel blasting tunneling according to claim 1, wherein the supporting upright post (2) is of a sectional hydraulic telescopic structure and comprises an inner rod and an outer barrel, the inner rod is slidably nested in the outer barrel, and a locking bolt is arranged on the side wall of the outer barrel and used for locking the telescopic length of the supporting upright post (2) to adapt to different tunnel section heights.
  4. 4. A supporting and isolating device for tunnel blasting tunneling according to claim 1 is characterized in that the connecting node (3) is of a double-lug plate structure, and the double-lug plates are hinged with the end parts of the diagonal brace (5) through pin shafts.
  5. 5. The supporting and isolating device for tunnel blasting tunneling according to claim 1, wherein the inclined stay bars (5) are telescopic rods with adjustable lengths, pin shaft connectors are arranged at two ends of each inclined stay bar, and an included angle between each inclined stay bar (5) and the supporting upright post (2) can be adjusted within a range of 30-60 degrees.
  6. 6. A supporting and isolating device for blasting tunneling of tunnels, as set forth in claim 1, characterized in that the top cantilever (6) comprises a fixed section and a telescopic section, the telescopic section is slidably nested in the fixed section, and a locating pin is arranged on the side wall of the fixed section for adjusting the extension length of the top cantilever (6) to adapt to different tunnel section widths.
  7. 7. A supporting and isolating device for tunnel blasting tunneling according to claim 1, wherein the hoisting assembly (7) comprises a fixed pulley (9), a lifting hook (10) and a steel wire rope (11), the fixed pulley (9) is fixed at the extending end of the top cantilever (6), one end of the steel wire rope (11) is wound on the fixed pulley (9), and the other end of the steel wire rope is connected with the lifting hook (10).
  8. 8. The supporting and isolating device for tunnel blasting tunneling according to claim 1, wherein the arc-shaped isolating plate (8) is of a segmented steel plate structure, the edge of each segment of steel plate is provided with a flange connecting edge, adjacent steel plates are fixedly connected, the surfaces of the steel plates are welded with transverse and longitudinal reinforcing ribs, and a buffer rubber layer is filled between the transverse and longitudinal reinforcing ribs.
  9. 9. The construction method of the supporting and isolating device for tunnel blasting tunneling is characterized by comprising the following steps of: S1, installing a base, clamping a fixed base (1) on a tunnel track foundation through a clamping groove, and fastening the fixed base (1) by adopting an anchor bolt; S2, erecting a stand column, vertically fixing a supporting stand column (2) on the top of a fixed base (1), adjusting the telescopic length of the supporting stand column (2) to be matched with the section height of a tunnel, and screwing a locking bolt; S3, installing a cantilever and an inclined strut, hinging a top cantilever (6) to a cantilever connecting seat (4), adjusting the extension length of the top cantilever (6), hinging two ends of an inclined strut (5) to a connecting node (3) and the top cantilever (6) respectively, and adjusting the length and an included angle of the inclined strut (5) to form a triangular support; S4, hoisting the isolation plate, namely hoisting the arc isolation plate (8) to a supporting structure in a segmented manner through a hoisting assembly (7), and fastening and connecting the arc isolation plate (8) with the supporting upright post (2), the connecting node (3), the cantilever connecting seat (4), the inclined supporting rod (5) and the top cantilever (6); S5, debugging and using, checking the tightness of each connecting part, confirming that the arc-shaped isolation plate (8) is attached to the inner wall of the tunnel, finishing the layout of the supporting isolation device, and performing blasting tunneling operation; And S6, after the blasting operation is finished, firstly removing the arc-shaped isolation plate (8), then removing the diagonal brace (5), the top cantilever (6) and the supporting upright post (2) in sequence, and finally removing the fixed base (1).
  10. 10. The construction method of the supporting and isolating device for tunnel blasting tunneling of claim 9, wherein in the step S5, a level bar is adopted to detect the perpendicularity of the supporting upright post (2) during debugging, and a clearance gauge is adopted to detect the clearance between the arc-shaped isolating plate (8) and the inner wall of the tunnel.

Description

Supporting and isolating device for tunnel blasting tunneling and construction method Technical Field The invention belongs to the technical field of tunnel engineering blasting support equipment, and particularly relates to a support isolation device for tunnel blasting tunneling and a construction method. Background In the tunnel blasting tunneling construction process, in order to avoid damage to the working area and field personnel behind the tunneling surface caused by flying stones and shock waves generated by blasting, a supporting and isolating device is usually required to be arranged behind the tunneling surface. The device in the prior art still has many defects to be improved, namely the traditional isolation device adopts a plane baffle structure, the fitting degree with the arc-shaped section of a tunnel is poor, shock waves generated by blasting are easy to permeate into a rear area from a gap between the baffle and the tunnel wall, the protection effect is difficult to guarantee, the supporting structure is a single upright post or a simple support, a stable supporting system is not formed, the device is easy to fall and shift under the action of blasting impact load, the isolation state cannot be reliably maintained, the isolation plate is designed into an integral heavy structure, the installation process depends on manual carrying and hoisting, the labor intensity is high, more time is consumed, the construction progress is influenced, meanwhile, the traditional construction method lacks standardized operation steps, the positioning accuracy of the supporting structure is difficult to guarantee, the debugging links are also lack, and the disassembly process is orderly, so that certain potential safety hazards are brought to the construction process. Therefore, the invention provides a supporting and isolating device for tunnel blasting tunneling and a construction method thereof, which are used for solving the problems of the background technology. Disclosure of Invention Aiming at the problems of the background technology, the invention aims to provide a supporting and isolating device for tunnel blasting tunneling and a construction method, which can effectively improve the supporting and isolating effect in the tunnel blasting tunneling, and the arc-shaped isolating plate is arranged to be matched with the arc-shaped inner wall of a tunnel, so that flying stones and shock waves generated by blasting can be better blocked, and the protection comprehensiveness is improved. In order to achieve the technical purpose, the invention adopts the following technical scheme: a supporting and insulating device for tunnel blasting driving, comprising: the fixed base is arranged on the track foundation of the tunneling surface and is used for providing bottom support; The support upright post is vertically fixed at the top of the fixed base; the connecting node is fixed at the middle upper region of the supporting upright post; The cantilever connecting seat is fixed at the top end of the supporting upright post; one end of the top cantilever is hinged to the cantilever connecting seat, and the other end of the top cantilever extends to the section of the tunnel; one end of the diagonal brace is hinged to the connecting node, the other end of the diagonal brace is hinged to the lower surface of the top cantilever, and the diagonal brace, the supporting upright post and the top cantilever form a triangular supporting structure; the hoisting assembly is hung at the extending end of the top cantilever; the arc-shaped isolation plate is adapted to the arc-shaped profile of the inner wall of the tunnel, and the edges of the two sides of the arc-shaped isolation plate are respectively fixedly connected with the supporting upright post, the connecting node, the cantilever connecting seat and the diagonal brace. Further limiting, the fixed base is a reinforced concrete pouring structure, a clamping groove matched with the tunnel track is formed in the bottom of the fixed base, an anti-skid rubber pad is arranged on the inner wall of the clamping groove, and the fixed base is fixedly connected with the tunnel track. Further limited, the support stand is sectional type hydraulic telescopic structure, including interior pole and urceolus, interior pole slip nest is in the urceolus, and the urceolus lateral wall sets up the locking bolt for the flexible length of locking support stand is in order to adapt to different tunnel section heights. Further defined, the connection node is a double-lug plate structure, and the double-lug plates are hinged with the end parts of the diagonal braces through pin shafts. Further limited, the inclined stay bar is a telescopic stay bar with adjustable length, pin shaft connectors are arranged at two ends of the telescopic stay bar, and an included angle between the inclined stay bar and the supporting upright post can be adjusted within a range of 30-60 degrees. Further limit