CN1047649C - Construction method for supporting and excavating of plate inserting floor of soil based tunnel and its plate inserting machine - Google Patents
Construction method for supporting and excavating of plate inserting floor of soil based tunnel and its plate inserting machine Download PDFInfo
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- CN1047649C CN1047649C CN97119179A CN97119179A CN1047649C CN 1047649 C CN1047649 C CN 1047649C CN 97119179 A CN97119179 A CN 97119179A CN 97119179 A CN97119179 A CN 97119179A CN 1047649 C CN1047649 C CN 1047649C
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Abstract
The present invention relates to a construction method for excavating underground railways and underground projects and used equipment thereof. Before a tunnel is excavated, an inserting plate is inserted along the top of the tunnel by an inserting plate machine to form a plate ceiling; a plate ceiling bracket is arranged at the tail end of the inserting plate following the excavation of the tunnel; then, a plate ceiling bracket is arranged at the head end of the inserting plate; reinforcing mesh sheets are arranged between the two plate ceiling brackets, and concrete is sprayed between the two plate ceiling brackets; subsequently, a tunnel excavation is continued according to the process. The inserting plate machine uses compressed air as power; hydraulic oil cylinders are pushed by hydraulic power; turning is controlled by a turning device and a horizontal oil cylinder thereof; lifting is controlled by a supporting oil cylinder; the inserting plate is impacted and pushed by a pneumatic impacting device. The method is suitable for special stratums and has the advantages of high safety, high reliability and high speed.
Description
The present invention relates to the equipment of a kind of underground railway and underground construction tunneling job practices and use thereof.
Publication number is CN1094785A " dead-weight balanced cantilever-shed frame method " by name, discloses dead-weight balanced method of a kind of construction of tunnel, and this method is that at one end the canopy support is constructed by portion, pierce piling bar to dilapidation, form the cantilever canopy, creep into then, this method Leapfrog type step by step advances.This method is to utilize dilapidation gravity to prop up country rock by piling bar and arch unit, opens the safety work space that wall goes out the constructor.It is inc adopting the formed ceiling of this method, and it is to close by the thin bridging between stake, and the stream person is from dredging, and block person is from stifled, and this method is to utilize pressure from surrounding rock and dilapidation to average out, and forms construction of tunnel dead-weight balanced cantilever-shed frame mining method.The stream person dredges certainly between stake owing to taking, and can cause land subsidence, jeopardizes surface structures and traffic safety, therefore is not suitable for the tunneling construction of shallow embedding earth tunnel, a suitable buried soil property tunnel excavation construction.And at present in underground railway, heating power tunnel, in underground construction tunnelings such as underground store, the underground parking construction, normal adopt " New Austrian Tunneling Method ".In " New Austrian Tunneling Method " construction, running into special formation, when easily caving in poor strata as layer of sand, fine sand layer, back fill course, silt clay layer etc., adopt squeezed into ductule more, and inject chemical grout by the catheter center hole and reinforce soil layer, Kai Wa method more on every side.This method operation is many, and technology is more complicated also, and progress is slow, especially to the grouting and reinforcing of fine sand layer, is difficult to produce a desired effect, and the useful event that often occurs collapsing causes land subsidence, jeopardizes above ground structure and traffic safety.The grouting and reinforcing expense is also than higher simultaneously.
The purpose of this invention is to provide a kind of tunneling job practices, i.e. construction method for supporting and excavating of plate inserting floor of soil based tunnel for the poor strata that easily caves at layer of sand, fine sand layer, back fill course, silt clay layer etc.This method is a kind of without the grouting and reinforcing soil layer, not only safe but also reliable, simple to operate, fireballing supporting method.Employed board-plugging device has advantage such as be convenient to operation, plate speed is fast.
For achieving the above object, the present invention takes following technical scheme: before this underground construction method for supporting and excavating of plate inserting floor of soil based tunnel is achieved in that tunnel piercing, along tunnel top, insert plate successively to tunneling direction, form the plate canopy at tunnel top, and installing plate canopy support, tunnel piercing then, installing plate canopy support again, follow-up reinforced mesh and sprayed mortar between above-mentioned two guidance tape canopy supports, promptly finish the plate tunneling construction of a working cell, and then plate is not inserted in the tunneling top, formation plate canopy, continuation tunnel piercing successively in the edge, and in inserting the plate construction, make every block of plate be interconnected to form closed type plate canopy.In when beginning, promptly before the tunnel piercing, also can first installing plate canopy support, plate again.Plate can use board-plugging device, also can manually use the air hammer plate.
In the method, the plate that is adopted is the typing long slab, and the wide two edges of its plate can be with lock mouthful, also can not have fore shaft.When the employing of typing long slab has the fore shaft mode, its fore shaft is shaped as corrugation shape, triangle, in flute profile, the U-shaped any, typing long slab in each working cell is engaged by fore shaft, the long both sides of the plate of the typing long slab between each working cell press mutually and take, and making formed plate canopy is closed type.
In the method, when the typing long slab adopts when not having the fore shaft mode, the wide both sides of plate of typing long slab overlap mutually in each working cell, the long both sides of the plate of the typing long slab between each working cell are pressed mutually and taken, and making formed plate canopy is closed type.
In the method, employed typing long slab is the long steel plate of typing, and its plate is long to be 1m to 6m, and plate is wide to be 150mm to 500mm, and thickness of slab is 3mm to 8mm.
In the method, after the plate tunneling construction of finishing a working cell, does not insert in the process of the long steel plate of typing at the tunneling top successively on the edge again, the long steel plate of employed typing can insert on slave plate canopy support top by board-plugging device, also can insert slave plate canopy support bottom, when the long steel plate of employed typing inserts in slave plate canopy support bottom, owing to will reserve the thickness of hanging reinforced mesh and sprayed mortar, utilize the plate tail that send the plate device will finalize the design long steel plate to insert 300mm to 500mm in the soil layer.After inserting the long steel plate of typing successively, continue tunnel piercing, nature is reserved the thickness of hanging reinforced mesh and sprayed mortar in the bottom of the plate tail of the long steel plate of typing.When the long steel plate of typing inserts by board-plugging device slave plate canopy support top,, therefore, just there are not the problems referred to above because that the plate tail of the long steel plate of typing buries is a little high.
The employed equipment of method of the present invention is board-plugging device.This board-plugging device includes chassis Power Drive Unit and the board plug device that has rubber tire, described Power Drive Unit includes the hydraulic oil pump that is driven by the external gas motivation, described hydraulic oil pump by the above-mentioned rubber tire of rubber tire fluid motor-driven voluntarily, described board plug device includes slewing equipment, this slewing equipment is installed on the described chassis, on the body of this slewing equipment, shaft gear is installed, two cross cylinders, the piston of described two cross cylinders respectively connects a tooth bar, and respectively with the teeth engagement of the symmetrical both sides of described shaft gear, this shaft gear connects revoliving arm by power transmission shaft, this revoliving arm upper end is hinged with the tailpiece of the piston rod of upper support oil cylinder, the cylinder body end of the lower end of this revoliving arm and lower support oil cylinder is hinged, the cylinder body end of described upper support oil cylinder, the tailpiece of the piston rod of described lower support oil cylinder is hinged on the support arm respectively, the head of this support arm is equipped with carriage, on this carriage, be provided with jib, front end at this jib is fixed with the sliding panel support, and on this jib, being provided with fixed head support and air hammer, the oil of above-mentioned each oil cylinder is imported and exported respectively and is connected with aforesaid hydraulic oil pump.The jib of this board-plugging device is finished and is done 360 ° of revolutions on the tunnel cross section by slewing equipment and cross cylinder control thereof, and jib is finished lifting in vertical direction by support arm and support cylinder control thereof.
In this board-plugging device, on the front portion of described support arm, connect the hinged elevation angle oil cylinder of ears by two pairs, the elevation angle of jib is by the adjustment of support arm and elevation angle oil cylinder control elevation angle angle thereof.
This board-plugging device is by the combination of above-mentioned two or three motion, and adopts air hammer to impact to re-pack, realize the operation of tunnel top plate, finish the vault and the construction of ceiling canopy plate of tunnel horizontal direction or elevation direction.
In this board-plugging device, described jib is by placing two concave slide grooves on the described carriage, be located on this carriage in the mode of being slidingly connected, and advancing compensating cylinder by two pairs of jib ears parallel hinged on the outer bottom of this jib, this advances the oil of compensating cylinder to import and export with aforesaid hydraulic oil pump and connects.Realize that by advancing compensating cylinder the orientation impact of plate advances.
In this board-plugging device, described fixed head support and air hammer by with its fixing fixed head on two pairs of slide blocks, be located on the described jib in the mode of being slidingly connected, and described jib is a groove shape, and the worm propeller by fluid motor-driven is housed in the groove of this jib, affixed with the said fixing plate with the nut of advancing of this worm propeller engagement, the oil of described hydraulic motor is imported and exported and aforesaid hydraulic oil pump connection.Realize feeding of air hammer by worm propeller.
In this board-plugging device, hydraulic oil pump can adopt two.
The invention will be further described below in conjunction with accompanying drawing.
Fig. 1 is for adopting the schematic diagram of the formed plate ceiling of method of the present invention
Fig. 2 is for adopting the formed plate ceiling of method of the present invention supporting schematic diagram
Fig. 3 is the A-A sectional drawing of Fig. 2
Fig. 4 is the engaged schematic diagram of U-shaped fore shaft of the long steel plate of typing
Fig. 5 is the board-plugging device structure chart
Fig. 6 is the B-B sectional drawing of Fig. 5
Fig. 7 is the slewing equipment front view of board-plugging device
Fig. 8 is the slewing equipment lateral view of board-plugging device
Fig. 9 is the slewing equipment vertical view of board-plugging device
As Fig. 1, Fig. 2, shown in Figure 3, running into layer of sand, fine sand layer, back fill course, when silt clay layers etc. easily cave in poor strata, utilize board-plugging device, along tunnel top (vault or flat-top), inserting typing long slab 101 according to order is plate, form closed type plate canopy at tunnel top, and at the tail end installing plate canopy support 102 of long slab 101 of finalizing the design, tunnel piercing then, again at the head end installing plate canopy support 102 of long slab 101 of finalizing the design, and between above-mentioned two guidance tape canopy supports 102, follow up reinforced mesh 103 and sprayed mortar 104, promptly finish the plate tunneling construction of a working cell, and then typing long slab 101 is not inserted in the tunneling top successively in the edge, form closed type plate canopy, continue tunnel piercing, installing plate canopy support 102, follow-up reinforced mesh 103 and sprayed mortar 104 between two guidance tape canopy supports 102 are finished the plate tunneling construction of a working cell again again.Job practices of the present invention is progressively carried out by the plate tunneling construction of above-mentioned working cell one by one.This method is safe and reliable, and is simple to operate, and speed is fast.
The employed plate canopy of method of the present invention support is a steel bow member commonly used in the tunneling construction.Plate canopy support 102 shown in Figure 3 is the grid arch.
Utilize board-plugging device, along tunnel top (vault or flat-top), the typing long slab of insertion is a plate, with lock mouthful or not with lock mouthful of the wide two edges of plate, and the application of these two kinds of plates is to determine according to geological condition and stressing conditions.Adopt with lock mouthful typing long slab, as shown in Figure 4, every typing long slab 101 is engaged, forms the plate canopy of sealing at tunnel top; Adopt not with lock mouthful typing long slab, every typing long slab overlaps mutually, forms closed plate canopy at tunnel top.As Fig. 1, Fig. 2, shown in Figure 3,, form the supporting of plate canopy by Ban Peng and 102 actings in conjunction of plate canopy support that typing long slab 101 forms.Follow-up reinforced mesh 103 and sprayed mortar 104 form elementary supporting in tunnel or permanent support.
When not digging the top along the tunnel and insert plate successively, be that insert slave plate canopy support bottom or insert on slave plate canopy support top, be according to the construction needs.When plate is inserted in slave plate canopy support bottom, utilize and send the plate device, the plate tail is inserted 300mm to 500mm in the soil layer.This is because will reserve the thickness of hanging reinforced mesh and sprayed mortar.In plate ceiling supporting schematic diagram shown in Figure 3, typing long slab 101 is that insert on slave plate canopy support 102 tops, does not therefore have above-mentioned problem.
As Fig. 2, shown in Figure 3, after finishing follow-up reinforced mesh 103 and sprayed mortar 104 constructions,, can reproduce and water reinforced concrete floor 105 according to the requirement of construction, form the permanent support in tunnel.
As shown in Figure 5, board-plugging device used in the present invention is to be power with compressed air, drives hydraulic oil pump 11,12 by pneumatic motor, and by fluid motor-driven rubber tire 14 voluntarily, fluid power promotes each hydraulic jack again.On the chassis 21 of board-plugging device, install back rotary device 9, slewing equipment 9 is hinged by upper and lower support cylinder 16,26 and support arm 19 on the revoliving arm 22, carriage 20 is housed on support arm 19, carriage 20 is provided with jib 3, jib 3 is finished and is done 360 ° of revolutions on the tunnel cross section by slewing equipment 9 and cross cylinder 10 controls thereof like this; Jib 3 is finished lifting in vertical direction by upper support oil cylinder 16,26 controls of lower support oil cylinder, and adjustment is controlled by elevation angle oil cylinder 18 in the elevation angle of jib 3.Combination by this two or three motion realizes the operation of tunnel top plate, finishes the vault and the construction of ceiling canopy plate of tunnel horizontal direction or horizon elevation angle direction.A construction height 2m to 8m, one-stop operation width 2m to 6m.As shown in Figure 5, on the chassis 21 of board-plugging device, be equipped with before hydraulic leg 15, the back hydraulic leg 13.
As shown in Figure 5, slewing equipment 9 is installed on the chassis 21 of board-plugging device.As Fig. 7, Fig. 8, shown in Figure 9, two cross cylinders 10 are installed on the body 209 of this slewing equipment, shaft gear 204, the piston 203 of described two cross cylinders 10 respectively connects a tooth bar 206, and respectively with the teeth engagement of the symmetrical both sides of described shaft gear 204, this shaft gear 204 connects revoliving arm 22 by power transmission shaft 210, as shown in Figure 5, the upper end of this revoliving arm 22 is hinged by the tailpiece of the piston rod of ears on the revoliving arm and upper support oil cylinder 16, the lower end of this revoliving arm 22 is hinged by the cylinder body end of ears under the revoliving arm and lower support oil cylinder 26, the cylinder body end of described upper support oil cylinder 16, the tailpiece of the piston rod of described lower support oil cylinder 26 respectively with support arm 19 on back ears and preceding ears hinged, and connect the hinged elevation angle oil cylinders 18 of ears by two pairs in the front portion of described support arm 19.Piston 203 by two cross cylinders 10 is made reverse motions, drives tooth bar 206 respectively and makes reverse motions, makes shaft gear 204 revolutions, and does 360 ° of revolutions by power transmission shaft 210, revoliving arm 2, support arm 19, carriage 20, drive jib 3.By with the action of the piston of the hinged upper support oil cylinder 16 of revoliving arm 22 and support arm 19, lower support oil cylinder 26, drive jib 3 and finish lifting in vertical direction.The elevation angle by the 18 control jibs 3 of the elevation angle oil cylinder on the support arm 19 is adjusted.
As shown in Figure 5, be fixed with sliding panel support 1 at the front end of jib 3, and on this jib 3, be provided with fixed head support 4 and air hammer 6.During use, the long steel plate head of will finalizing the design places on the sliding panel support 1, and the typing on its plate tail and the air hammer 6 is impacted 5 and is close, and by the impact of air hammer 6, realizes that the orientation of plate is impacted propelling.
As shown in Figure 5, carriage 20 by two symmetrical isosceles triangle plates and on two groove pieces form, carriage 20 is hinged on the bracing frame 19 by the drift angle of two triangle plate.Jib 3 places two pairs of grooves on the carriage 20, advances compensating cylinder 17 by two pairs of jib ears parallel hinged on the outer bottom of jib 3.Advance compensating cylinder 17 to drive jib 3 by this and on carriage 20, slide, can realize that also the orientation of plate advances.
As Fig. 5, shown in Figure 6, fixed head support 4 and air hammer 6 are fixed on the fixed head 23, are slidingly connected on the jib 3 by two pairs of slide blocks 24 on the fixed head 23.And jib 3 is a groove shape, and the worm propeller 2 that is driven by hydraulic motor 8 is housed in the groove of this jib 3, and is affixed with fixed head 23 with the nut 25 of advancing of these worm propeller 2 engagements.Air hammer 6 connects the compressed air airduct by blast connection 7, supplies with power, and worm propeller 2 is driven by hydraulic motor 8, realizes feeding of air hammer 6.Fixed head support 4, sliding panel support 1 all are complementary according to plate section configuration and size.
Board-plugging device impulse stroke 2500mm to 5000mm used in the present invention, air hammer ballistic work 200J to 500J, jib propulsive force 2200N to 4000N.
Board-plugging device used in the present invention is fit to the full face plate operation of small-sized and large tunnel section, and simple in structure, easy to operate, the efficient height.
Embodiment
Method of the present invention and board-plugging device thereof experimentize in heat enginnering tunnel jaywalk section.The wide 5.4m of tunnel excavation section, the high 4m of vault, the tunnel vault is apart from face of land 5m.Geological conditions is: 0 to 2m is miscellaneous fill under the face of land, and 2 to 5m is the opaque silt, and 5 to 9m is the flour sand layer.Time landslide causes land subsidence in order to prevent tunnel piercing, guarantees traffic above-ground safety, adopts plate ceiling supporting tunneling construction method, utilizes board-plugging device plate of the present invention, forms the supporting of enclosed plate canopy at the tunnel vault.The long 1.5m of typing steel plate, wide 220mm, thickness of slab 4mm, the plate broad edge is a U-shaped, plate canopy set spacing 750mm to 1000mm, elementary supporting sprayed mortar 250mm is thick, secondary lining concrete 200mm.The tunnel excavation driving does not cave in, and guarantees that traffic above-ground is unimpeded.Construction safety is reliable, and speed is fast, and cost is low.
Claims (9)
1, a kind of construction method for supporting and excavating of plate inserting floor of soil based tunnel, before the tunnel piercing, along tunnel top, insert plate successively to tunneling direction, form the plate canopy at tunnel top, and installing plate canopy support, tunnel piercing then, installing plate canopy support is characterized in that: follow-up reinforced mesh and sprayed mortar between above-mentioned two guidance tape canopy supports again, promptly finish the plate tunneling construction of a working cell, and then plate is not inserted in the tunneling top, formation plate canopy, continuation tunnel piercing successively in the edge, and in inserting the plate construction, make every block of plate be interconnected to form closed type plate canopy.
2, construction method for supporting and excavating of plate inserting floor of soil based tunnel according to claim 1, it is characterized in that: the plate that is adopted is the typing long slab, all with lock mouthful of the wide two edges of its plate, its fore shaft is shaped as any in corrugation shape, triangle, flute profile, the U-shaped, typing long slab in each working cell is connected by fore shaft is engaged, and the long both sides of the plate of the typing long slab between each working cell are taken by mutual pressure and are connected.
3, construction method for supporting and excavating of plate inserting floor of soil based tunnel according to claim 1, it is characterized in that: the plate that is adopted is the typing long slab, the wide both sides of plate of typing long slab in each working cell are connected by mutual overlap joint, the long both sides of the plate of the typing long slab between each working cell are taken by mutual pressure connect.
4, according to claim 2 or 3 described construction method for supporting and excavating of plate inserting floor of soil based tunnel, it is characterized in that: employed typing long slab is the long steel plate of typing, and its plate is long to be 1m to 6m, and plate is wide to be 150mm to 500mm, and thickness of slab is 3mm to 8mm.
5, construction method for supporting and excavating of plate inserting floor of soil based tunnel according to claim 4, it is characterized in that: after the plate tunneling construction of finishing a working cell, does not insert in the process of the long steel plate of typing at the tunneling top successively on the edge again, when the long steel plate of employed typing inserts in slave plate canopy support bottom, utilize the plate tail that send the plate device will finalize the design long steel plate to insert 300mm to 500mm in the soil layer.
6, the used board-plugging device of the described tunneling job practices of a kind of claim 1, this board-plugging device includes the chassis that has rubber tire, Power Drive Unit and board plug device, described Power Drive Unit includes the hydraulic oil pump that is driven by the external gas motivation, described hydraulic oil pump by the above-mentioned rubber tire of rubber tire fluid motor-driven voluntarily, it is characterized in that: described board plug device includes slewing equipment, this slewing equipment is installed on the described chassis, on the body of this slewing equipment, shaft gear is installed, two cross cylinders, the piston of described two cross cylinders respectively connects a tooth bar, and respectively with the teeth engagement of the symmetrical both sides of described shaft gear, this shaft gear connects revoliving arm by power transmission shaft, this revoliving arm upper end is hinged with the tailpiece of the piston rod of upper support oil cylinder, the cylinder body end of the lower end of this revoliving arm and lower support oil cylinder is hinged, the cylinder body end of described upper support oil cylinder, the tailpiece of the piston rod of described lower support oil cylinder is hinged on the support arm respectively, the head of this support arm is equipped with carriage, on this carriage, be provided with jib, front end at this jib is fixed with the sliding panel support, and on this jib, being provided with fixed head support and air hammer, the oil of above-mentioned each oil cylinder is imported and exported respectively and is connected with aforesaid hydraulic oil pump.
7, board-plugging device according to claim 6 is characterized in that: connect the hinged elevation angle oil cylinder of ears by two pairs on the front portion of described support arm.
8, board-plugging device according to claim 7, it is characterized in that: described jib is by placing two concave slide grooves on the described carriage, be located on this carriage in the mode of being slidingly connected, and advancing compensating cylinder by two pairs of jib ears parallel hinged on the outer bottom of this jib, this advances the oil of compensating cylinder to import and export with aforesaid hydraulic oil pump and connects.
9, board-plugging device according to claim 8, it is characterized in that: described fixed head support and air hammer by with its fixing fixed head on two pairs of slide blocks, be located on the described jib in the mode of being slidingly connected, and described jib is a groove shape, and the worm propeller by fluid motor-driven is housed in the groove of this jib, affixed with the said fixing plate with the nut of advancing of this worm propeller engagement, the oil of described hydraulic motor is imported and exported and aforesaid hydraulic oil pump connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97119179A CN1047649C (en) | 1997-10-24 | 1997-10-24 | Construction method for supporting and excavating of plate inserting floor of soil based tunnel and its plate inserting machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97119179A CN1047649C (en) | 1997-10-24 | 1997-10-24 | Construction method for supporting and excavating of plate inserting floor of soil based tunnel and its plate inserting machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1179501A CN1179501A (en) | 1998-04-22 |
| CN1047649C true CN1047649C (en) | 1999-12-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97119179A Expired - Fee Related CN1047649C (en) | 1997-10-24 | 1997-10-24 | Construction method for supporting and excavating of plate inserting floor of soil based tunnel and its plate inserting machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1047649C (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100532786C (en) * | 2004-09-02 | 2009-08-26 | 同济大学 | Digging method for shallow underground hole |
| CN102226401A (en) * | 2011-04-15 | 2011-10-26 | 上海建工集团股份有限公司 | Non-vertical curtain structure and construction method thereof |
| CN104631492B (en) * | 2015-01-06 | 2016-08-17 | 济南轨道交通集团有限公司 | A kind of installation method of underground arch top board |
| CN105804771B (en) * | 2016-05-11 | 2018-09-07 | 宁波市交通规划设计研究院有限公司 | A kind of compatibility of deformation control method of the native constructing tunnel of plastic flow modeling |
| CN107060774B (en) * | 2017-05-08 | 2018-12-18 | 重庆电讯职业学院 | A kind of anti-tunnel portal wall damage device and construction method |
| CN109611137B (en) * | 2018-12-26 | 2020-05-29 | 长安大学 | Adjacent tunnel ventilation method for connecting open sunshade |
| CN111502705A (en) * | 2019-03-14 | 2020-08-07 | 中铁五局集团有限公司 | Tunnel steel plate advanced support structure and method |
| CN111140237B (en) * | 2020-01-08 | 2021-01-15 | 合肥市轨道交通集团有限公司 | Underground excavation method for subway tunnel tunneling |
| CN111828048B (en) * | 2020-07-28 | 2022-09-06 | 中建七局安装工程有限公司 | Method for preventing powder soil from caving at top of shallow-buried underground-excavated tunnel construction tunnel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100318A (en) * | 1987-01-23 | 1987-08-26 | 陶义 | Secretly digging method with predisposed roof |
| CN1094785A (en) * | 1993-04-13 | 1994-11-09 | 中国人民解放军***后勤部基建营房部 | Dead-weight balanced cantilever-shed frame method |
-
1997
- 1997-10-24 CN CN97119179A patent/CN1047649C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87100318A (en) * | 1987-01-23 | 1987-08-26 | 陶义 | Secretly digging method with predisposed roof |
| CN1094785A (en) * | 1993-04-13 | 1994-11-09 | 中国人民解放军***后勤部基建营房部 | Dead-weight balanced cantilever-shed frame method |
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| Publication number | Publication date |
|---|---|
| CN1179501A (en) | 1998-04-22 |
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