CN109162738A - Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window - Google Patents
Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window Download PDFInfo
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- CN109162738A CN109162738A CN201811334438.8A CN201811334438A CN109162738A CN 109162738 A CN109162738 A CN 109162738A CN 201811334438 A CN201811334438 A CN 201811334438A CN 109162738 A CN109162738 A CN 109162738A
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- window
- chute
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- tunnel
- mould
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- 239000004567 concrete Substances 0.000 title claims abstract description 85
- 230000032798 delamination Effects 0.000 title claims abstract description 27
- 238000005266 casting Methods 0.000 title claims abstract description 16
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000013461 design Methods 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000010410 layer Substances 0.000 claims description 8
- 239000002344 surface layer Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 239000004568 cement Substances 0.000 claims 1
- 230000015271 coagulation Effects 0.000 claims 1
- 238000005345 coagulation Methods 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011218 segmentation Effects 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
- E21D11/04—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
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (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)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window the present invention relates to a kind of, it is characterized by: realizing that concrete delamination enters the mechanism that mould pours by window includes tunnel and the template for being located at tunnel inner wall face, along length of tunnel direction and longitudinal windowing for being used to be passed through concrete material equipped with several in the template, the windowing includes upper window, middle window and lower window, it is successively arranged main hopper from top to bottom in the certain length in the tunnel, two distributing T-pipe slots, four shunting tumbling barrels and chute, distributing T-pipe slot position is in two downsides of main hopper in the same vertical face in tunnel, distributing T-pipe slot is connect with main hopper by the first chute, two downsides that tumbling barrel is located at diversion channel are shunted in the facade in tunnel, tumbling barrel is shunted to connect with diversion channel by the second chute, the present invention realizes that concrete delamination enters the machine that mould pours by window Structure simple structure and reasonable design is conducive to improve tunnel pouring construction efficiency.
Description
Technical field:
Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window the present invention relates to a kind of.
Background technique:
With increasing for the construction such as highway, railway, the case where highway or railway crossing tunnel, is more and more, carries out in the past to tunnel
When pouring construction, it is required to be poured in tunnel height and length direction segmentation, construction efficiency is low, and the mistake after pouring occurs
Layer woollen is more, and cleaning task afterwards are huge.
Summary of the invention:
Realize that concrete delamination enters the mechanism and its casting craft that mould pours, the reality by window the purpose of the present invention is to provide a kind of
Existing concrete delamination by window enter the mechanism structure that mould pours is simple, design rationally, be conducive to improve tunnel pouring construction efficiency.
To achieve the above object, the present invention adopts the following technical scheme:
The present invention realizes that concrete delamination enters the mechanism that mould pours by window, it is characterised in that: including tunnel and is located at tunnel inner wall
The template in face, in the template along length of tunnel direction and it is longitudinal be equipped with several windowings for being used to be passed through concrete material, it is described
Windowing includes upper window, middle window and lower window, is successively arranged main hopper, two from top to bottom in the certain length in the tunnel
Distributing T-pipe slot, four shunting tumbling barrels and chute, in the same vertical face in tunnel distributing T-pipe slot position in main hopper two downside,
Distributing T-pipe slot is connect with main hopper by the first chute, and two downsides that tumbling barrel is located at diversion channel are shunted in the facade in tunnel,
It shunts tumbling barrel to connect with diversion channel by the second chute, the chute towards upper window is third chute, and third chute is slipped with second
The lower end connection of slot connection, the chute towards middle window are the 4th chute, and the 4th chute shunts the bypass pipe of tumbling barrel with connecting
Connection；Chute towards lower window is the 5th chute, and the 5th chute is connected with the lower through-tube for shunting tumbling barrel is connect.
Further, above-mentioned first, second, third and fourth and five chute feed end and discharge end difference in height be less than 2.0m.
Further, in same longitudinal orientation, middle window is located at upper window and lower window for above-mentioned upper window and lower window
Perpendicular bisector position on.
Further, said one main hopper, two distributing T-pipe slots, four shunting tumbling barrels and chute constitute a component layers
Enter mould by window and pour component, is equipped with two groups along length of tunnel direction or three component layers enter mould by window and pour component, adjacent major ingredient
Bucket by with pour the upper siphunculus connection that trolley connect.
Further, above-mentioned main hopper is rectangular opening shape cone bucket: 50 × 45cm of size suitable for reading, 47 × 23cm of bottom size,
High 50cm；Distributing T-pipe slot is rectangular opening shape cone bucket: 40 × 25cm of size suitable for reading, bottom size 35 × 18cm, high 25cm；It shunts
Tumbling barrel is that Upper rectangular mouth lower part is circular cone bucket: top 50 × 50cm of size suitable for reading, lower openings caliber 27cm, wall thickness
3mm, high 40cm；Chute is arc panel: its width 34cm, deep 10cm.
The present invention realizes that concrete delamination enters the casting craft of mould by window, it is characterised in that: the realization concrete delamination
Entering mould to pour mechanism by window includes tunnel and the template for being located at tunnel inner wall face, along length of tunnel direction and longitudinal direction in the template
It is used to be passed through the windowing of concrete material equipped with several, the windowing includes upper window, middle window and lower window, the tunnel
Main hopper, two distributing T-pipe slots, four shunting tumbling barrels and chute are successively arranged in certain length from top to bottom, in the same of tunnel
Distributing T-pipe slot position is in two downsides of main hopper in one vertical face, and distributing T-pipe slot is connect with main hopper by the first chute, in tunnel
Two downsides that tumbling barrel is located at diversion channel are shunted in the facade in road, are shunted tumbling barrel and are connect with diversion channel by the second chute, are led to upper
The chute of window is third chute, and lower end that third chute connect with the second chute connects, and the chute towards middle window is the
Four chutes, the 4th chute are connected with the bypass pipe for shunting tumbling barrel is connect；Chute towards lower window is the 5th chute, the 5th chute
It is connected with the lower through-tube for shunting tumbling barrel is connect；When construction, concrete is pumped into main hopper by delivery pump pump line, by distributing T-pipe
Slot, shunting tumbling barrel and each chute are guided to each corresponding operation window, and it is symmetrical to realize that concrete enters mould layering by window from the bottom to top
It pours.
Further, when above-mentioned casting concrete, concrete maximum height of drop is no more than 2m, trolley front and back concrete
Height difference forbids unilateral one-time-concreting 1m or more no more than 0.5m no more than 0.6m, left and right concrete height.
Further, in casting process, it should be noted that the case where observing template, reinforcing bar, when discovery has deformation, displacement,
Should take reinforcement measure in time, when in construction such as discovery pumping concrete slump deficiency, self-watering must not be arrogated to oneself, when triple window layering by
After the completion of window pours, trolley delivery pump connecting leg to vault carries out concrete and rushes to summit operation.
Further, concreting should be carried out continuously, and concrete is made firm by ramming closely knit using artificial and attached vibrator；When
For some reason when interval, the time that the intermittent time should be less than the presetting period of bottom concrete or can remold, when more than permission interval
When the time, by treatment of construction joints, lining cutting concrete seam crossing must carry out dabbing processing.
Further, the secondary lining concrete strength applied after Support Deformation is basicly stable in the early stage reaches 8MPa or more
Demoulding；100% side that the unstable secondary lining concrete strength applied in advance of preliminary bracing should reach design strength can demould；
When demoulding, the temperature difference between inside concrete and surface layer, surface layer and environment is not greater than 20 DEG C, and the outer surface temperature difference is not in structure
It obtains and is greater than 15 DEG C；Inside concrete must not demoulding before starting cooling；After secondary lining demoulding, spray maintenance is carried out, curing time:
To the concrete using portland cement, ordinary portland cement mixing, 7d must not be less than；To Mixed With Admixture or have impervious etc.
It is required that concrete, 14d must not be less than.
The present invention realize concrete delamination by window enter mechanism structure that mould pours is simple, design rationally, be conducive to improve tunnel
Road pouring construction efficiency.
Detailed description of the invention:
Fig. 1 is that two component layers of the invention by window enter the organigram that mould pours component；
Fig. 2 is organigram of the invention；
Fig. 3 is the expanded view along tunnel direction certain length template；
Fig. 4 is the organigram that distributing T-pipe slot is connect with shunting tumbling barrel.
Specific embodiment:
It includes tunnel 1 and the template 2 for being located at tunnel inner wall face, institute that the present invention, which realizes that concrete delamination enters the mechanism that mould pours by window,
It states along length of tunnel direction and longitudinal windowing 3 for being used to be passed through concrete material equipped with several in template 2, the windowing includes upper
Window 301, middle window 302 and lower window 303 are successively arranged main hopper 4, two in the certain length in the tunnel from top to bottom
5, four shunting tumbling barrels 6 of distributing T-pipe slot and chute 7, the interior distributing T-pipe of same vertical face (plane as where Fig. 2) in tunnel
Slot 5 is located at two downsides of main hopper 4, and distributing T-pipe slot 5 is connect with main hopper 5 by the first chute 701, the facade in tunnel
Two downsides that tumbling barrel 6 is located at diversion channel 5 are shunted in (plane as where Fig. 4), are shunted tumbling barrel 6 and are slipped with diversion channel 5 by second
Slot 702 connects, and the chute towards upper window 301 is third chute 703, the lower end that third chute 703 is connect with the second chute 702
Portion's connection, the chute towards middle window 302 are the 4th chute 704, and the 4th chute 704 shunts the bypass pipe 601 of tumbling barrel 6 with connecting
Connection；Chute towards lower window is the 5th chute 705, and the 5th chute 705 is connected with the lower through-tube 602 for shunting tumbling barrel 6 is connect.
One of embodiment, in order to which feeding is reliable and stable, above-mentioned first, second, third and fourth and five chute feed end with go out
Expect that the difference in height at end is less than 2.0m.
One of embodiment, as shown in figure 3, good in order to make to pour effect, above-mentioned upper window 301 exists with lower window 303
In same longitudinal direction orientation, middle window 302 is located on the perpendicular bisector position of upper window and lower window.
Further, it in order to design rationally, said one main hopper, two distributing T-pipe slots, four shunting tumbling barrels and slips
Slot one component layers of composition enter mould by window and pour component A, are equipped with two groups along length of tunnel direction or three component layers enter mould by window and pour
Component, adjacent main hopper by with pour the upper siphunculus 8 that trolley connect and connect.
Further, in order to design rationally, above-mentioned main hopper 4 is rectangular opening shape cone bucket: 50 × 45cm of size suitable for reading, lower mouth
Size 47 × 23cm, high 50cm；Distributing T-pipe slot 5 be rectangular opening shape cone bucket: 40 × 25cm of size suitable for reading, bottom size 35 ×
18cm, high 25cm；It is circular cone bucket that shunting tumbling barrel 6, which is Upper rectangular mouth lower part: top 50 × 50cm of size suitable for reading, lower part is opened
Mouth caliber 27cm, wall thickness 3mm, high 40cm；Chute is arc panel: its width 34cm, deep 10cm.
Fig. 3 is the expanded view along tunnel direction certain length template, and arrow direction is length of tunnel direction, wherein 201 are
Top template, the construction scope not poured in the application, 202 be the mould for offering window 301, middle window 302 and lower window 303
Plate is also to have windowing on 201, is to be poured with other mode, does not illustrate here.
The present invention realizes that concrete delamination enters the casting craft of mould by window, and the realization concrete delamination enters mould by window and pours
Mechanism includes tunnel and the template for being located at tunnel inner wall face, is equipped with several along length of tunnel direction and longitudinal direction in the template and uses
In the windowing for being passed through concrete material, the windowing includes upper window, middle window and lower window, and the certain length in the tunnel is interior certainly
It is successively arranged main hopper, two distributing T-pipe slots, four shunting tumbling barrels and chute under above, the threeway in the same vertical face in tunnel
Diversion channel is located at two downsides of main hopper, and distributing T-pipe slot is connect by the first chute with main hopper, divided in the facade in tunnel
Stream tumbling barrel is located at two downsides of diversion channel, shunts tumbling barrel and is connect with diversion channel by the second chute, the chute towards upper window is
Third chute, the lower end connection that third chute is connect with the second chute, the chute towards middle window is the 4th chute, and the 4th slips
Slot is connected with the bypass pipe for shunting tumbling barrel is connect；Chute towards lower window is the 5th chute, and the 5th chute is gone here and there with shunting is connect
The lower through-tube connection of cylinder；When construction, concrete is pumped into main hopper by delivery pump pump line, by distributing T-pipe slot, shunts tumbling barrel
It is guided to each corresponding operation window with each chute, realizes that concrete enters mould layering by window from the bottom to top and symmetrically pours.
Further, when above-mentioned casting concrete, concrete maximum height of drop is no more than 2m, trolley front and back concrete
Height difference forbids unilateral one-time-concreting 1m or more no more than 0.5m no more than 0.6m, left and right concrete height.
Further, in casting process, it should be noted that the case where observing template, reinforcing bar, when discovery has deformation, displacement,
Should take reinforcement measure in time, when in construction such as discovery pumping concrete slump deficiency, self-watering must not be arrogated to oneself, when triple window layering by
After the completion of window pours, trolley delivery pump connecting leg to vault carries out concrete and rushes to summit operation.
Further, concreting should be carried out continuously, and concrete is made firm by ramming closely knit using artificial and attached vibrator；When
For some reason when interval, the time that the intermittent time should be less than the presetting period of bottom concrete or can remold, when more than permission interval
When the time, by treatment of construction joints, lining cutting concrete seam crossing must carry out dabbing processing.
Further, the secondary lining concrete strength applied after Support Deformation is basicly stable in the early stage reaches 8MPa or more
Demoulding；100% side that the unstable secondary lining concrete strength applied in advance of preliminary bracing should reach design strength can demould；
When demoulding, the temperature difference between inside concrete and surface layer, surface layer and environment is not greater than 20 DEG C, and the outer surface temperature difference is not in structure
It obtains and is greater than 15 DEG C；Inside concrete must not demoulding before starting cooling；After secondary lining demoulding, spray maintenance is carried out, curing time:
To the concrete using portland cement, ordinary portland cement mixing, 7d must not be less than；To Mixed With Admixture or have impervious etc.
It is required that concrete, 14d must not be less than.
The present invention realize concrete delamination by window enter mechanism structure that mould pours is simple, design rationally, be conducive to improve tunnel
Road pouring construction efficiency.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (10)
1. a kind of realize that concrete delamination enters the mechanism that mould pours by window, it is characterised in that: including tunnel and be located at tunnel inner wall
The template in face, in the template along length of tunnel direction and it is longitudinal be equipped with several windowings for being used to be passed through concrete material, it is described
Windowing includes upper window, middle window and lower window, is successively arranged main hopper, two from top to bottom in the certain length in the tunnel
Distributing T-pipe slot, four shunting tumbling barrels and chute, in the same vertical face in tunnel distributing T-pipe slot position in main hopper two downside,
Distributing T-pipe slot is connect with main hopper by the first chute, and two downsides that tumbling barrel is located at diversion channel are shunted in the facade in tunnel,
It shunts tumbling barrel to connect with diversion channel by the second chute, the chute towards upper window is third chute, and third chute is slipped with second
The lower end connection of slot connection, the chute towards middle window are the 4th chute, and the 4th chute shunts the bypass pipe of tumbling barrel with connecting
Connection；Chute towards lower window is the 5th chute, and the 5th chute is connected with the lower through-tube for shunting tumbling barrel is connect.
2. realization concrete delamination according to claim 1 enters the mechanism that mould pours by window, it is characterised in that: described
One, the difference in height of the feed end of two, three, four and five chutes and discharge end is less than 2.0m.
3. realization concrete delamination according to claim 1 enters the mechanism that mould pours by window, it is characterised in that: the upper window
With lower window in same longitudinal orientation, middle window is located on the perpendicular bisector position of upper window and lower window mouth.
4. realization concrete delamination according to claim 1 enters the mechanism that mould pours by window, it is characterised in that: one
Main hopper, two distributing T-pipe slots, four shunting tumbling barrels and chute one component layers of composition enter mould by window and pour component, long along tunnel
Degree direction, which is equipped with two groups or three component layers and enters mould by window, pours component, and adjacent main hopper with pour that trolley connect by upper leading to
Pipe connection.
5. realization concrete delamination according to claim 1 enters the mechanism that mould pours by window, it is characterised in that: the major ingredient
Bucket is rectangular opening shape cone bucket: 50 × 45cm of size suitable for reading, bottom size 47 × 23cm, high 50cm；Distributing T-pipe slot is rectangular opening
Shape cone bucket: 40 × 25cm of size suitable for reading, bottom size 35 × 18cm, high 25cm；It is round that shunting tumbling barrel, which is Upper rectangular mouth lower part,
The cone bucket of shape: top 50 × 50cm of size suitable for reading, lower openings caliber 27cm, wall thickness 3mm, high 40cm；Chute is arc panel:
Its width 34cm, deep 10cm.
6. a kind of casting craft realized concrete delamination and enter mould by window, it is characterised in that: the realization concrete delamination is by window
Entering mould to pour mechanism includes tunnel and the template for being located at tunnel inner wall face, is equipped in the template along length of tunnel direction and longitudinal direction
Several are used to be passed through the windowing of concrete material, and the windowing includes upper window, middle window and lower window, the tunnel it is certain
Main hopper, two distributing T-pipe slots, four shunting tumbling barrels and chute are successively arranged in length from top to bottom, in the same vertical of tunnel
Distributing T-pipe slot position is in two downsides of main hopper in face, and distributing T-pipe slot is connect with main hopper by the first chute, in tunnel
Two downsides that tumbling barrel is located at diversion channel are shunted in facade, are shunted tumbling barrel and are connect with diversion channel by the second chute, lead to upper window
Chute be third chute, lower end that third chute connect with the second chute connects, and the chute towards middle window slips for the 4th
Slot, the 4th chute are connected with the bypass pipe for shunting tumbling barrel is connect；Chute towards lower window is the 5th chute, the 5th chute and company
Connect the lower through-tube connection for shunting tumbling barrel；When construction, concrete is pumped into main hopper by delivery pump pump line, by distributing T-pipe slot,
It shunts tumbling barrel and each chute is guided to each corresponding operation window, realize that concrete enters mould layering by window from the bottom to top and symmetrically pours
It builds.
7. the casting craft according to claim 6 realized concrete delamination and enter mould by window, it is characterised in that: described to pour
When concrete, concrete maximum height of drop is no more than 2m, and trolley front and back concrete height difference is no more than 0.6m, left and right coagulation
Native height forbids unilateral one-time-concreting 1m or more no more than 0.5m.
8. the casting craft according to claim 6 realized concrete delamination and enter mould by window, it is characterised in that: pouring
Cheng Zhong, it should be noted that the case where observation template, reinforcing bar, when discovery has deformation, displacement, reinforcement measure should be taken in time, in construction
When such as finding pumping concrete slump deficiency, self-watering must not be arrogated to oneself, after the completion of triple window layering is poured by window, trolley delivery pump connects
Pipe to vault carries out concrete and rushes to summit operation.
9. the casting craft according to claim 6 realized concrete delamination and enter mould by window, it is characterised in that: concrete pours
Building should be carried out continuously, and concrete is made firm by ramming closely knit using artificial and attached vibrator；When interval for some reason, the intermittent time answers small
Presetting period in bottom concrete or the time that can remold, when being more than allows the intermittent time, by treatment of construction joints, lining cutting concrete
Seam crossing must carry out dabbing processing.
10. the casting craft according to claim 6 realized concrete delamination and enter mould by window, it is characterised in that: in the early stage
The secondary lining concrete strength applied after Support Deformation is basicly stable reaches 8MPa or more and demoulds；Preliminary bracing is not stable in advance
100% side that the secondary lining concrete strength applied should reach design strength can demould；When demoulding, inside concrete and surface layer,
The temperature difference between surface layer and environment is not greater than 20 DEG C, and the outer surface temperature difference is not greater than 15 DEG C in structure；Inside concrete is opened
Beginning must not demoulding before cooling down；After secondary lining demoulding, spray maintenance is carried out, curing time: to using portland cement, ordinary silicon
The concrete of acid salt cement mixing must not be less than 7d；To Mixed With Admixture or there is the impervious concrete for waiting requirements, must not be less than
14d。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811334438.8A CN109162738A (en) | 2018-11-09 | 2018-11-09 | Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811334438.8A CN109162738A (en) | 2018-11-09 | 2018-11-09 | Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window |
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| CN109162738A true CN109162738A (en) | 2019-01-08 |
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| CN201811334438.8A Pending CN109162738A (en) | 2018-11-09 | 2018-11-09 | Realize that concrete delamination enters the mechanism and its casting craft that mould pours by window |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110485463A (en) * | 2019-08-30 | 2019-11-22 | 中建五局土木工程有限公司 | Vertically to wall pouring construction method and pouring construction device |
| CN111119945A (en) * | 2020-02-24 | 2020-05-08 | 中铁十七局集团第四工程有限公司 | Tunnel secondary lining concrete pumping extrusion type pouring construction method |
| CN111749714A (en) * | 2020-07-30 | 2020-10-09 | 四川港航建设工程有限公司 | Window-by-window layered pouring system for circular water delivery tunnel wall and construction method |
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| CN111119945B (en) * | 2020-02-24 | 2021-10-15 | 中铁十七局集团第四工程有限公司 | Tunnel secondary lining concrete pumping extrusion type pouring construction method |
| CN111749714A (en) * | 2020-07-30 | 2020-10-09 | 四川港航建设工程有限公司 | Window-by-window layered pouring system for circular water delivery tunnel wall and construction method |
| CN111749714B (en) * | 2020-07-30 | 2021-11-09 | 四川港航建设工程有限公司 | Window-by-window layered pouring system for circular water delivery tunnel wall and construction method |
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