AU2021102866A4 - A method for structure reinforcement of existing tunnel lining - Google Patents
A method for structure reinforcement of existing tunnel lining Download PDFInfo
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- AU2021102866A4 AU2021102866A4 AU2021102866A AU2021102866A AU2021102866A4 AU 2021102866 A4 AU2021102866 A4 AU 2021102866A4 AU 2021102866 A AU2021102866 A AU 2021102866A AU 2021102866 A AU2021102866 A AU 2021102866A AU 2021102866 A4 AU2021102866 A4 AU 2021102866A4
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- steel frames
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- 230000002787 reinforcement Effects 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 205
- 239000010959 steel Substances 0.000 claims abstract description 205
- 238000009415 formwork Methods 0.000 claims abstract description 64
- 239000004567 concrete Substances 0.000 claims abstract description 24
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 33
- 238000009413 insulation Methods 0.000 claims description 31
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 13
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 7
- 239000011150 reinforced concrete Substances 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005553 drilling Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
Disclosed is a method for structure reinforcement of existing tunnel lining, providing
arch lining steel frames as main support structure; form support units by using lining
steel frames support formworks; distance between the innermost side of said support
units and the existing lining is less than 37.5 cm; ensure maintenance of contact wire
system as well as safety during construction; pour concrete in stages on the inside of
said support formworks; remove lining steel frames and formworks when said
pouring is completed; said method can greatly improve work efficiency and avoid
negative influence towards safety of driving system.
1
DRAWINGS
A
2 201
FIG. 2
A
101
0.0 0103
102
FIG. 3
2
Description
201 2
FIG. 2
101
0.0 0103 102
FIG. 3
[0001] The invention relates to the technical field of tunnel construction, in particular to a method for structure reinforcement of existing tunnel lining.
[0002] Lining is a permanent support structure built with reinforced concrete and other materials along the periphery of the tunnel to prevent deformation or collapse of the rock and soil in the tunnel construction field; after the construction of the tunnel was completed and put into use, some of the linings can have problems with water seepage and block loss due to the influence of the geological and climatic environment of the tunnel lining, which seriously affected the traffic safety in the tunnel; especially in railway tunnels, when the train passes through at high speed, wind pressure will be generated on the one hand, and strong vibration can be generated on the other hand; wind pressure and vibration will aggravate the damage of the lining; in order to solve the above technical problems, it is necessary to strengthen the existing lining; for highway tunnels, part of the lanes can be closed during the construction process, which has less impact on tunnel traffic, and the thickness of the lining and the supporting space for the placement of construction machinery are relatively large, making the construction less difficult.
[0003] However, for railway tunnels that are in operation, the difficulty suddenly increases; on the one hand, current railway is basically an electrified railway line, a catenary is set up inside tunnel, and the catenary must be avoided during the construction process, and the secondary lining needs to keep a certain distance from the catenary; radial space between the existing lining and the catenary is 37.5 cm; if a layer of 25 cm of secondary lining is added, it will be difficult to complete with the existing formwork support system; on the other hand, the construction can only be carried out at the skylight point of the railway operation, and it is necessary to realize the rapid construction in stage; the existing structure of supporting structure of the full hall bracket is difficult to realize.
[0004] Therefore,developing and designing a reinforcement structure and
reinforcement method for the lining of a railway tunnel in operation is an urgent problem in this field.
[0005] This invention aims to provide a method for structure reinforcement of existing tunnel lining, by providing arch lining steel frames as main support structure; use bolts to fix lining steel frames on the inside of tunnel; form support units by using lining steel frames support formworks; distance between the innermost side of said support units and the existing lining is less than 37.5 cm; avoid clearance interfering; ensure maintenance of contact wire system as well as safety during construction; pour concrete in stages on the inside of said support formworks; remove lining steel frames and formworks when said pouring is completed.
[0006] A method for structure reinforcement of existing tunnel lining is characterized in that, support units are set at intervals along a tunnel; concrete pouring cavities are formed between the support units and the inner side of said existing lining; said support units comprise steel reinforcement cages for lining; steel frames are set at the front and rear ends of said steel reinforcement cages for lining; insulation plates are arranged inside the steel frame for lining; chamfer reinforcing steel bars are provided to said insulation plates; chamfer formworks are wrapped around the outside of the chamfer reinforcing steel bars; said steel reinforcement cages for lining have main bearing reinforcements in arch structure, horizontal reinforcements in horizontally way and steel spacer bars in cylindrical rod-shaped structure; said main bearing reinforcements, horizontal reinforcements and steel spacer bars are tied together by steel wires; said steel frames in arch structure is symmetrically provided at the front and rear ends of said steel reinforcement cages for lining; sidewall steel frames are provided on the lower end of said steel frames in a vertical I-steel structure; lateral arch steel frames are provided on the top end of said sidewall steel frames in a vertical I-steel structure; dome steel frames are provided on top end of said lateral arch steel frames in a vertical I-steel structure; insulation plates in arched plate structure are provided to seal with side of said steel frames on the inside; chamfer reinforcing steel bars in bent structure are evenly distributed on the inner end surface of said insulation plates; chamfer formworks in bent arch structure are provided to the outer side of chamfer reinforcing steel bars and are sleeved with said insulation plates; lining formworks in an arched plate-like structure are provided on inner arch surface of said
steel reinforcement cages for lining and between two sets of said steel frame for lining; main bodies of said lining formworks are vertically arranged sidewall formworks and dome formworks in arc panel structure that matched and connected with said sidewall formworks; stationary frames are provided to the inner sidewall of said sidewall formworks; main body of said stationary frames comprises steel channels; lower platens in square plate structure are provided on the surface of said steel channels; joint bolts in cylindrical structure are provided to said lower platens; said joint bolts are clamped between two steel channels and are matched and plugged with steel frames; both ends of said joint bolts are connected with lower platens and steel frames by locknuts.
[0007] said sidewall steel frames are connected to lateral arch steel frames by sidewall junction plates in square plate structure; said dome steel frames are connected to lateral arch steel frames by lateral arch junction plates in curved plate structure; said lateral arch junction plates, sidewall junction plates and steel frames for lining are connected by bolts.
[0008] said insulation plates are welded to the side wall of steel frames for lining; insulation plate forms a closed surface on the I-shaped side of steel frames for lining.
[0009] main bodies of chamfer reinforcing steel bars has cylindrical steel structure; diameter of said chamfer reinforcing steel bars is 12mm; bending angle of said chamfer reinforcing steel bars is 450 .
[0010] Compared with prior art, beneficial effects of the present invention are listed herein: modified reinforcement structure is reasonably set up; said art has strong functionality; here listed advantages in below:
[0011] Separate steel frames and steel reinforcement cages for lining by chamfer reinforcing steel bar; keep separation status of reinforced concretes and steel frames for lining after pouring, making it easier for steel frames to be removed thus reduce the difficulty but improve the efficiency of demolding.
[0012] Steel frames for lining has sidewall steel frames, lateral arch steel frames and dome steel frames; said sidewall steel frames, lateral arch steel frames and dome steel frames are connected with lateral arch junction plate and sidewall junction plates by bolts; split connection like this makes it easier to remove steel frames for lining in sections, avoiding damages caused by cutting, and prolonging the service life of the steel frame.
[0013] Chamfer reinforcing steel bars inside insulation plates and chamfer formworks outside the chamfer reinforcing steel bars make the two sides of the reinforced concrete structure form a draft angle, which further reduces the difficulty of demolding of steel frames for lining. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is the structural diagram of supporting unit;
[0015] FIG. 2 is the decomposition diagram of FIG. 1;
[0016] FIG. 3 is enlargement diagram of partial structure of part A in FIG. 2;
[0017] FIG. 4 is enlargement diagram of partial structure of part B in FIG. 2;
[0018] FIG. 5 is installation structure diagram of steel frame in odd number section;
[0019] FIG. 6 is installation structure diagram of steel reinforcement cage in odd number section;
[0020] FIG. 7 is installation structure diagram of formwork in odd number section;
[0021] As is shown in drawings, 1.steel reinforcement cage for lining; 2.steel frame for lining; 3.lateral arch junction plate; 4.sidewall junction plate; 5.insulation plate; 6.chamfer reinforcing steel bar; 7.chamfer formwork; 8.lining formwork; 9.stationary frame; 101.main bearing reinforcement; 102.horizontal reinforcement; 103.steel spacer bars; 201.sidewall steel frame; 202.lateral arch steel frame; 203.dome steel frame; 801.sidewall formwork; 802.dome formwork; 901.steel channel; 902.ower platen; 903.joint bolt; 904.locknut DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0022] Detailed and completed description of the embodiment will be illustrated with drawings; said embodiments are part of this invention; based on embodiments of the present invention, all other embodiments obtained by those skilled in the art without innovative work shall fall within the protection scope of the present invention.
[0023] FIG. 1 to 4 indicate a method for structure reinforcement of existing tunnel lining is characterized in that, support units are set at intervals along a tunnel; concrete pouring cavities are formed between the support units and the inner side of said existing lining; said support units comprise steel reinforcement cages for lining(1); steel frames(2) are set at the front and rear ends of said steel reinforcement cages for lining(1); insulation plates(5) are arranged inside the steel frame for lining(2); chamfer reinforcing steel bars(6) are provided to said insulation plates(5);
chamfer formworks(7) are wrapped around the outside of the chamfer reinforcing steel bars(6); said steel reinforcement cages for lining(1) have main bearing reinforcements(101) in arch structure, horizontal reinforcements(102) in horizontally way and steel spacer bars(103) in cylindrical rod-shaped structure; said main bearing reinforcements(101), horizontal reinforcements(102) and steel spacer bars(103) are tied together by steel wires; said steel frames(2) in arch structure is symmetrically provided at the front and rear ends of said steel reinforcement cages for lining(1); sidewall steel frames(201) are provided on the lower end of said steel frames(2) in a vertical I-steel structure; lateral arch steel frames(202) are provided on the top end of said sidewall steel frames(201) in a vertical I-steel structure; dome steel frames(203) are provided on top end of said lateral arch steel frames(202) in a vertical I-steel structure; insulation plates(5) in arched plate structure are provided to seal with side of said steel frames(2) on the inside; chamfer reinforcing steel bars(6) in bent structure are evenly distributed on the inner end surface of said insulation plates(5); chamfer formworks(7) in bent arch structure are provided to the outer side of chamfer reinforcing steel bars(6) and are sleeved with said insulation plates(5); lining formworks(8) in an arched plate-like structure are provided on inner arch surface of said steel reinforcement cages for lining(1) and between two sets of said steel frame for lining(2); main bodies of said lining formworks(8) are vertically arranged sidewall formworks(801) and dome formworks(802) in arc panel structure that matched and connected with said sidewall formworks(801); stationary frames(9) are provided to the inner sidewall of said sidewall formworks(8); main body of said stationary frames(9) comprises steel channels(901); lower platens(902) in square plate structure are provided on the surface of said steel channels(901); joint bolts(903) in cylindrical structure are provided to said lower platens(902); said joint bolts(903) are clamped between two steel channels(901) and are matched and plugged with steel frames(2); both ends of said joint bolts(903) are connected with lower platens(902) and steel frames(2) by locknuts(904).
[0024] Said sidewall steel frames(201) are connected to lateral arch steel frames(202) by sidewall junction plates(4) in square plate structure; said dome steel frames(203) are connected to lateral arch steel frames(202) by lateral arch junction plates(3) in curved plate structure; said lateral arch junction plates(3), sidewall junction plates(4) and steel frames for lining(2) are connected by bolts; split connection like this makes it possible to remove steel frames(2) in sections during the demolding, reducing the
difficulty but improve the efficiency of said demolding thus prolonging repeated service life of said steel frames(2).
[0025] Said insulation plates(5) are welded to the side wall of steel frames for lining(2); insulation plate(5) forms a closed surface on the I-shaped side of steel frames for lining(2); said welding can separate steel reinforcement cage(1) and steel frames(2); making it easier for steel frames(2) to be removed from the reinforced concrete structured linings after poring.
[0026] Main bodies of chamfer reinforcing steel bars(6) has cylindrical steel structure; diameter of said chamfer reinforcing steel bars(6) is 12mm; bending angle of said chamfer reinforcing steel bars(6) is 45 0 ; structure like this can provide good support
to chamfer formworks(7), keeping said chamfer formworks(7) maintain in good stability; after pouring, a good draft angle is formed on the side of steel frames(2), which further reduces the difficulty of demolding of said steel frames(2).
[0027] Compared with prior art, the existing tunnel reinforcement structure involved in this invention has the following advantages:
[0028] Separate steel frames and steel reinforcement cages for lining by chamfer reinforcing steel bar; keep separation status of reinforced concretes and steel frames for lining after pouring, making it easier for steel frames to be removed thus reduce the difficulty but improve the efficiency of demolding.
[0029] Steel frames for lining has sidewall steel frames, lateral arch steel frames and dome steel frames; said sidewall steel frames, lateral arch steel frames and dome steel frames are connected with lateral arch junction plate and sidewall junction plates by bolts; split connection like this makes it easier to remove steel frames for lining in sections, avoiding damages caused by cutting, and prolonging the service life of the steel frame.
[0030] Chamfer reinforcing steel bars inside insulation plates and chamfer formworks outside the chamfer reinforcing steel bars make the two sides of the reinforced concrete structure form a draft angle, which further reduces the difficulty of demolding of steel frames for lining.
[0031] Construction steps are listed herein:
[0032] Step 1: artificial chiseling; clean tunnel ground and manually set up protective frame, and then manually chisel the inner wall of existing tunnel lining; thickness of the electric drill chisel is 2-3mm;
[0033] Step 2: move exposed cables outside, move exposed cables outside the construction area and put cover to said cables;
[0034] Step 3: steel frame installation for lining; divide tunnel into sections by length(see drawings 5-7) and give serial numbers according to the sections; set support unit in sections in odd number and install steel frame manually; connect sidewall steel frames in vertical form with inner sidewalls of said tunnel; gap distance between two sidewall steel frames is 1.7-1.85 meters; temporary fixation spikes are provided on both left and right side of sidewall steel frames; nuts are demanded for said spikes with diameter of 20mm and together with iron pad with thickness of mm; length of chemical anchors are demanded to be 20mm; lateral arch steel frames are provided to the top of sidewall steel frames after installation of sidewall steel frames; lateral arch steel frames are demanded to fit the inner wall of said tunnel; connect sidewall steel frame, lateral arch steel frame and lateral arch junction plate together by bolts; temporary fixation spikes are provided on both left and right side of sidewall steel frames; nuts are demanded for said spikes with diameter of 20mm and together with iron pad with thickness of10mm;
[0035] Step 4: locate reinforcing steel bars of lining; use manual measurement method to set the drilling position between two sets of steel frames for lining; drilling with electric drill; ensure the drilled holes have diameter of 12mm and share horizontal spacing of 414mm; circumferential spacing of drilling holes is Im, anchoring depth of said steel spacer bars is required to be 20cm; anchoring glue is used to anchor;
[0036] Step 5: tie up steel reinforcement cages for lining; keep steel reinforcement cages layered laying as a whole, in order from the outer arch to the inner arch; main bearing reinforcements with a diameter of 18mm are laid circumferentially at a distance of 250mm along the direction of steel spacer bars between the steel frames for lining; lay the horizontal reinforcements with a diameter of 10mm in a circular direction at a pitch of 250mm, between said horizontal reinforcements of the inner and outer arches, double-headed hook-shaped inner and outer loop hook bars with a diameter of 8mm are used for laying at a circular spacing of 250mm; during laying process, main bearing reinforcements, horizontal reinforcements, inner and outer loop hook bars and steel spacer bars are tied together by steel wires;
[0037] Step 6: steel frame reinforcement; first, drill bolt holes for lock feet; use 4
cement mortar bolts with diameter of 25mm to anchor the bottom of steel frames; required anchorage length is 2.5m; drill the loop anchor rod holes at a distance of 1.5m along the two sides of steel frames; use cement mortar bolts with diameter of mm to anchor the bottom of steel frames; required anchorage length is 2.5m;
[0038] Step 7: lining formwork installation; weld insulation plates to the inner side of steel frames; uniformly weld chamfer reinforcing steel bars on the inner side of insulation plates in a loop way; set the chamfer formworks on the outside of chamfer reinforcing steel bars; provide spot welding to side edges of chamfer formworks with upper edges of insulation plates; connect sidewall formworks and dome formworks of lining formworks with stationary frames from both sides of steel reinforcement cages from top to the bottom; provide stationary frames to the surface of lining formworks; connect steel channels, lining formworks and steel frames together with bolts; stationary frames are laid on the surface of lining formworks along the circumferential direction, and the circumferential distance is 28cm; preset grouting ports are set at the middle and vault positions of lining formworks;
[0039] Step 8: concrete pouring; after completing all installation and reinforcement of odd number lining formworks, pour concrete into the reinforced pouring cavities in turn; concrete is poured in a bottom-up sequence; use pump trucks to pour concrete into the closed formworks; concrete is poured in a bottom-up sequence; pour concrete to the side wall of tunnel lining; after said concrete has solidified, pour concrete to the arched part of tunnel lining so as to avoid damage to the formwork due to lateral pressure caused by one-time pouring; seal pouring ports in turn after segmented grouting is completed.
[0040] Step 9: demolding; remove steel frames and formworks when the lining is solidified and stabilized after pouring process is completed; demolition order is from top to bottom, from outside to inside; remove stationary frames, lining formworks, steel frames, insulation plates, chamfer reinforcing steel bars and chamfer formworks in turn; collect removed parts and clean up tunnel; keep the inside of tunnel clean and complete concrete pouring process and support units dismantling of all sections in odd number in sequence;
[0041] Step 10: pour concrete to remaining sections; after pouring concrete to all sections in odd number, use the end concrete faces of sections in odd number as the end formworks for sections in even number; use steel frames to re-support inner formworks inside sections in even number; form pouring cavities among inner
sidewall of lining, surface of sections in odd number and formworks; complete concrete pouring process in the order of step 3 to step 9; finish lining constriction after formworks being removed.
[0042] Working principle: seal insulation plates(5) and the sidewall of steel frames(2) to form insulation status between steel frames(2) and steel reinforcement cages(1); when pouring process is completed, spaces between concrete and steel frames(2) remain sealed, making it easy for steel frames(2) to finish the demolding; steel frames(2) are connected with sidewall steel frames(201), lateral arch steel frames(202), dome steel frames(203), lateral arch junction plates(3) and sidewall junction plates(4) by bolts; split connection like this enables steel frames(2) to be removed into sections in the demolding process when the pouring is completed, thus avoid higher difficulty brought by integral demolition; said method also lower the loss of said steel frames(2); chamfer reinforcing steel bars(6) and chamfer formworks(7) from insulation plates(5) make the steel frames(2) forms a good draft angle with sidewall of lining, making it easier for steel frames(2) to demold thus improve efficiency of demolding.
[0043] Reinforcement structure disclosed here is a unit structure; this unit can be used in detailed reinforcement places inside a tunnel; more units are demanded to provide reinforcement to the inside of whole tunnel; for instance, several sections can be divided along the tunnel to work as reinforcement areas and provide reinforcement respectively; with intention to make it easier for steel frames to be removed after concrete pouring, it can be carried out at intervals; pour concrete into sections in odd number; remove all formworks and steel frames from sections in odd number after concrete in said sections achieve design strength; use the end concrete faces of sections in odd number as the end formworks for sections in even number by re-support inner side formworks; after removing steel frames, reinforcement units have no exposed steel frames, thus avoid negative influence to the strength of concrete caused by corrosion of steel frames.
[0044] Although the embodiments of this invention have been shown and described, those of ordinary technical staff can understand that various changes, modifications, replacement and modifications can be made to these embodiments without departing from the principle and spirit of the this utility model patent. This invention is defined by the appended claims and their equivalents.
Claims (4)
1. A method for structure reinforcement of existing tunnel lining is characterized in that, support units are set at intervals along a tunnel; concrete pouring cavities are formed between the support units and the inner side of said existing lining; said support units comprise steel reinforcement cages for lining(1); steel frames(2) are set at the front and rear ends of said steel reinforcement cages for lining(1); insulation plates(5) are arranged inside the steel frame for lining(2); chamfer reinforcing steel bars(6) are provided to said insulation plates(5); chamfer formworks(7) are wrapped around the outside of the chamfer reinforcing steel bars(6); said steel reinforcement cages for lining(1) have main bearing reinforcements(101) in arch structure, horizontal reinforcements(102) in horizontally way and steel spacer bars(103) in cylindrical rod-shaped structure; said main bearing reinforcements(101), horizontal reinforcements(102) and steel spacer bars(103) are tied together by steel wires; said steel frames(2) in arch structure is symmetrically provided at the front and rear ends of said steel reinforcement cages for lining(1); sidewall steel frames(201) are provided on the lower end of said steel frames(2) in a vertical I-steel structure; lateral arch steel frames(202) are provided on the top end of said sidewall steel frames(201) in a vertical I-steel structure; dome steel frames(203) are provided on top end of said lateral arch steel frames(202) in a vertical I-steel structure; insulation plates(5) in arched plate structure are provided to seal with side of said steel frames(2) on the inside; chamfer reinforcing steel bars(6) in bent structure are evenly distributed on the inner end surface of said insulation plates(5); chamfer formworks(7) in bent arch structure are provided to the outer side of chamfer reinforcing steel bars(6) and are sleeved with said insulation plates(5); lining formworks(8) in an arched plate-like structure are provided on inner arch surface of said steel reinforcement cages for lining(1) and between two sets of said steel frame for lining(2); main bodies of said lining formworks(8) are vertically arranged sidewall formworks(801) and dome formworks(802) in arc panel structure that matched and connected with said sidewall formworks(801); stationary frames(9) are provided to the inner sidewall of said sidewall formworks(8); main body of said stationary frames(9) comprises steel channels(901); lower platens(902) in square plate structure are provided on the surface of said steel channels(901); joint bolts(903) in cylindrical structure are provided to said lower platens(902); said joint bolts(903) are clamped between two steel channels(901) and are matched and plugged with steel frames(2); both ends of said joint bolts(903) are connected with lower platens(902) and steel frames(2) by
locknuts(904).
2. A method for structure reinforcement of existing tunnel lining as claimed in claim 1, characterized in that, said sidewall steel frames(201) are connected to lateral arch steel frames(202) by sidewall junction plates(4) in square plate structure; said dome steel frames(203) are connected to lateral arch steel frames(202) by lateral arch junction plates(3) in curved plate structure; said lateral arch junction plates(3), sidewall junction plates(4) and steel frames for lining(2) are connected by bolts.
3. A method for structure reinforcement of existing tunnel lining as claimed in claim 1, characterized in that, said insulation plates(5) are welded to the side wall of steel frames for lining(2); insulation plate(5) forms a closed surface on the I-shaped side of steel frames for lining(2).
4. A method for structure reinforcement of existing tunnel lining as claimed in claim 1, characterized in that, main bodies of chamfer reinforcing steel bars(6) has cylindrical steel structure; diameter of said chamfer reinforcing steel bars(6) is 12mm; bending angle of said chamfer reinforcing steel bars(6) is 45°.
D R AW I N G S 26 May 2021 2021102866
FIG. 1
D R AW I N G S 26 May 2021 2021102866
FIG. 2
FIG. 3
D R AW I N G S 26 May 2021 2021102866
FIG. 4
FIG. 5
D R AW I N G S 26 May 2021 2021102866
FIG. 6
FIG. 7
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| AU2021102866A AU2021102866A4 (en) | 2021-05-26 | 2021-05-26 | A method for structure reinforcement of existing tunnel lining |
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| AU2021102866A AU2021102866A4 (en) | 2021-05-26 | 2021-05-26 | A method for structure reinforcement of existing tunnel lining |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483112A (en) * | 2021-12-23 | 2022-05-13 | 中国科学院武汉岩土力学研究所 | Arch foot structure, construction method and arch foot system for tunnel primary support |
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2021
- 2021-05-26 AU AU2021102866A patent/AU2021102866A4/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114483112A (en) * | 2021-12-23 | 2022-05-13 | 中国科学院武汉岩土力学研究所 | Arch foot structure, construction method and arch foot system for tunnel primary support |
| CN114483112B (en) * | 2021-12-23 | 2023-05-23 | 中国科学院武汉岩土力学研究所 | Arch leg structure, construction method and arch leg system of tunnel primary support |
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