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CN-116971797-B - Tunnel center drainage ditch and inverted arch filling integrated construction method

CN116971797BCN 116971797 BCN116971797 BCN 116971797BCN-116971797-B

Abstract

The invention provides a tunnel center drainage ditch and inverted arch filling integrated construction method which comprises the following steps of 1) completing inverted arch lining construction, 2) installing split heads on at least two positions of an inverted arch lining, 3) constructing a split-free formwork net and steel bar combined body, 4) installing the combined body on the split heads at two positions of 2), 5) installing a split head I for supporting a front section of a tunnel center drainage ditch pouring formwork, 6) installing the tunnel center drainage ditch pouring formwork in the combined body, 7) installing center drainage ditch cover plate steel bars on steel bars of two sides of a center drainage ditch body, 8) installing a baffle head formwork, 9) pouring inverted arch filling concrete, 10) pouring center drainage ditch concrete, 11) continuing pouring inverted arch filling concrete, 12) continuing pouring center drainage ditch concrete, 13) concrete moisture-keeping and heat-preserving maintenance, 14) demoulding and 15) performing circulating construction.

Inventors

  • WEN DEAN
  • JIAO WEINING
  • LI XIAOHUA

Assignees

  • 中交第二公路工程局有限公司

Dates

Publication Date
20260508
Application Date
20230705

Claims (7)

  1. 1. The integrated construction method for filling the central drainage ditch and the inverted arch of the tunnel is characterized by comprising the following steps: Step 1) finishing inverted arch lining construction; Step 2), installing split heads for supporting at two positions on the inverted arch lining; Step 3) pre-processing and installing the reinforcing steel bars of the central drainage ditch, and welding the disassembly-free template net on the outer sides of the reinforcing steel bars of the central drainage ditch by using reinforcing steel bar protection layer reinforcing steel bars; The central drain channel steel bars are concave and comprise central drain channel body steel bars at two sides, central drain channel bottom steel bars at the bottom and central drain channel cover plate steel bars positioned above the central drain channel body steel bars at two sides; step 4) installing the assembly of the disassembling-free template net and the reinforcing steel bars in the step 3) on the two split heads in the step 2); Step 5), installing a split heads I for supporting the front section of the pouring template of the central ditch of the tunnel; step 6) installing the tunnel center ditch pouring template in the combination body of the step 4); step 7) installing the reinforcing steel bars of the central drain cover plate on the reinforcing steel bars of the central drain body at two sides according to the design requirement; Step 8) installing a blocking head template; step 9) pouring inverted arch filling concrete; step 10), pouring concrete of a central drainage ditch; Step 11) continuing pouring inverted arch filling concrete after the step 9) is finished, and reaching the construction requirement; step 12) pouring 10) continuously pouring the concrete of the central drainage ditch to meet the construction requirement, and finishing pouring; Step 13), concrete moisture and heat preservation maintenance; Step 14) demolding; Step 15) resumes step 1) so that the construction is circulated.
  2. 2. The integrated construction method for tunnel center drainage ditch and inverted arch filling according to claim 1, further comprising the step of 16) brushing a release agent.
  3. 3. The integrated construction method for filling the central drainage ditch and the inverted arch of the tunnel according to claim 1, wherein the split heads consist of a supporting plate and 4 split heads uniformly distributed under the supporting plate, each split head consists of a steel pipe and a scaffold base, one end of the steel pipe is welded with the supporting plate, the other end of the steel pipe is sleeved on the scaffold base, and the height of the split heads is adjusted through the scaffold base.
  4. 4. The integrated construction method for filling the central drainage ditch and the inverted arch of the tunnel according to claim 1 is characterized in that steel bar protection layer cushion blocks are arranged at the lower edge of the central drainage ditch cover plate steel bars, the number of the steel bar protection layer cushion blocks is 4-5 pieces/m 2 , the central drainage ditch cover plate steel bars are bound and connected with steel bars of central ditch bodies on two sides by iron wires, and the binding point distance is 0.8m.
  5. 5. The integrated construction method for tunnel center drainage ditch and inverted arch filling according to claim 1, wherein the split heads I and the center drainage ditch are coaxial and are arranged on the outer edge of the current pouring section.
  6. 6. The integrated construction method for filling a central drainage ditch and an inverted arch of a tunnel according to claim 1, wherein the disassembly-free formwork net is composed of a plurality of steel corrugated plates and a plurality of V-shaped steel bars which are uniformly distributed at intervals.
  7. 7. The integrated construction method for filling the central drainage ditch and the inverted arch of the tunnel according to claim 1 is characterized in that the step 8) of installing the blocking head template is characterized in that the front section of the pouring template of the central drainage ditch of the tunnel is located on the split heads I, the blocking head template comprises a left blocking head template and a right blocking head template, the left blocking head template and the right blocking head template are installed on two sides of the split heads I, and the pouring template of the central drainage ditch of the tunnel is clamped, so that no gap exists between the left blocking head template and the right blocking head template.

Description

Tunnel center drainage ditch and inverted arch filling integrated construction method Technical Field The invention belongs to the technical field of tunnel construction, and particularly relates to a tunnel center drainage ditch and inverted arch filling integrated construction method. Background The tunnel is for discharging surrounding rock infiltration, road surface infiltration, can set up central escape canal. The central drainage ditch is arranged under the road surface and in the inverted arch filled concrete. Most of the reinforced concrete structures of the central drainage ditch have higher concrete marks than the inverted arch filling, and usually a groove is reserved when the inverted arch is filled, and then the central drainage ditch is constructed. The utility model patent 'pouring template for central ditch of tunnel' (ZL 202222780089.0) realizes one-time cast-in-place of the bottom, the body and the cover plate of the central ditch, and the central ditch is still lagged behind the filling construction of the inverted arch, generally lagging for at least more than 6 days. Because the center drainage ditch is lagged behind the inverted arch filling construction, the inverted arch is filled with the groove, and the driving cannot be performed, and the steel plate is generally covered, so that the vehicle passing requirement is met, and the contact area of the edge of the groove and the covered steel plate is easy to crush. The steel plate is easily displaced, and the vehicle falls into the groove and overturns. The deformation of the steel plate can form a staggered platform, causing the vehicle to puncture. In order to solve the progress problem, the safety problem and the quality problem of the construction of the central ditch, an integrated construction scheme for filling the central drainage ditch and the inverted arch needs to be innovated and developed. Disclosure of Invention In order to solve the problems in the prior art, the invention aims to provide the integrated construction method for filling the central drainage ditch and the inverted arch of the tunnel, and the method has the characteristics of reduced working procedures, rapid progress, good integrity of the central drainage ditch and the like. The technical scheme of the invention is as follows: the invention provides a tunnel center drainage ditch and inverted arch filling integrated construction method, which comprises the following steps: Step 1) finishing inverted arch lining construction; Step 2), installing split heads for supporting at least two positions on the inverted arch lining; Step 3) pre-processing and installing the reinforcing steel bars of the central drainage ditch, and welding the disassembly-free template net on the outer sides of the reinforcing steel bars of the central drainage ditch by using reinforcing steel bar protection layer reinforcing steel bars; step 4) installing the assembly of the disassembling-free template net and the reinforcing steel bars in the step 3) on the two split heads in the step 2); Step 5), installing a split heads I for supporting the front section of the pouring template of the central ditch of the tunnel; step 6) installing the tunnel center ditch pouring template in the combination body of the step 4); step 7) installing the reinforcing steel bars of the central drain cover plate on the reinforcing steel bars of the central drain body at two sides according to the design requirement; step 8) installing a blocking head template; step 9) pouring inverted arch filling concrete; step 10), pouring concrete of a central drainage ditch; Step 11) continuing pouring inverted arch filling concrete after the step 9) is finished, and reaching the construction requirement; step 12) pouring 10) continuously pouring the concrete of the central drainage ditch to meet the construction requirement, and finishing pouring; Step 13), concrete moisture and heat preservation maintenance; Step 14) demolding; Step 15) resumes step 1) so that the construction is circulated. Further, the method also comprises the step 16) of brushing a release agent. Further, the split heads comprise backup pad and even 4 bench legs of cloth under the backup pad, every bench leg constitute by steel pipe and scaffold frame collet, steel pipe one end and backup pad welded connection, the other end cover is on the scaffold frame collet, adjusts split heads height through scaffold frame collet. Further, the central drain channel steel bars are concave and comprise central drain channel body steel bars at two sides, central drain channel bottom steel bars at the bottom and central drain channel cover plate steel bars positioned above the central drain channel body steel bars at two sides. Furthermore, the lower edge of the steel bar of the central drain cover plate is provided with steel bar protection layer cushion blocks, the number of the steel bar protection layer cushion blocks is 4-5 pieces/m 2, the steel bar of