CN110486025B - Starting empty pushing device and method in large-diameter shield tunnel - Google Patents
Starting empty pushing device and method in large-diameter shield tunnel Download PDFInfo
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- CN110486025B CN110486025B CN201910797012.4A CN201910797012A CN110486025B CN 110486025 B CN110486025 B CN 110486025B CN 201910797012 A CN201910797012 A CN 201910797012A CN 110486025 B CN110486025 B CN 110486025B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 14
- 230000000977 initiatory effect Effects 0.000 claims abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 10
- 230000005641 tunneling Effects 0.000 claims abstract description 8
- 239000010720 hydraulic oil Substances 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 238000010276 construction Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0621—Shield advancing devices
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- General Life Sciences & Earth Sciences (AREA)
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- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses an initiating air-assisted thrusting device and method in a large-diameter shield tunnel, and aims to solve the technical problems that the existing air-assisted thrusting device is poor in bearing capacity and heavy in size, and the corbels are not easy to separate in the existing air-assisted thrusting method, so that stepping is difficult. The air pushing device comprises guide platforms which are arranged in parallel, wherein each guide platform comprises a horizontal plane and an inclined plane which is arranged oppositely, guide rails are laid on the inclined planes, grooves which are distributed at intervals are arranged on the horizontal plane of each guide platform, fixing holes are formed in the bottom surfaces of the grooves, fixing columns which are matched with the fixing holes in size are correspondingly arranged in the fixing holes, supporting plates are connected to the fixing columns, and counter-force supports for fixing the pushing oil cylinders to push the shield tunneling machine are arranged on the supporting plates; the air-pushing method comprises the steps of building a guide table, forming a groove, drilling, inserting round steel, welding a supporting plate and a counter-force support and pushing. The invention has the beneficial effects that: the structure and the construction process of the device are simplified, the bearing capacity of the device is improved, and the device is more suitable for the air thrust of a large-diameter shield machine.
Description
Technical Field
The invention relates to the technical field of stepping of shield tunneling machines, in particular to an initiating empty pushing device and method in a large-diameter shield tunnel.
Background
At present, the shield tunnel is developing toward bigger degree of depth, major diameter, longer distance, and the tunnel that holds the shield structure machine is dug at the work well both sides manual work at first earlier stage in the construction, and the shield constructs the quick-witted aircraft nose and accomplishes the back in the work well, pushes away to the tunnel that sets up in advance by the work well in, equipment such as later trailer get into and assemble with the aircraft nose. The shield machine does not work in the process that the shield machine is pushed to the designated position in the hole from the working well, so that the shield machine becomes idle pushing.
Traditional shield constructs quick-witted air-pushing and adopts the bracket as the fulcrum, when making the guide platform, reserves the bracket groove in guide rail both sides, inserts the box-shaped support column that the steel sheet welded in the bracket groove, and the bracket supports on the support column, and later hydraulic cylinder leans on the bracket to promote shield structure machine and gos forward. However, for a large-diameter shield tunneling machine, due to the fact that the self weight is large, the reaction force provided by a single bracket is not enough to meet the propelling requirement, the rear concrete is crushed due to the fact that the bracket groove is stressed too much in the propelling process, the propelling cannot be continued, the adjacent bracket grooves need to be used, actual setting of the bracket grooves is much denser than a theoretical value, and frequent replacement also affects the construction process. Consequently, in the actual construction, adopt two sets of bracket welding to improve bearing capacity for a whole, but the too big difficult removal of the whole quality of bracket under this kind of mode needs to separate again, and the preparation process is comparatively complicated, and the too big meeting card of bracket support column atress moreover leads to the fact the construction difficulty.
Disclosure of Invention
The invention provides an initiating air-assisted thrust device and method in a large-diameter shield tunnel, and aims to solve the technical problems that the existing air-assisted thrust device is poor in bearing capacity and heavy in size, and the corbels are not easy to separate in the existing air-assisted thrust method, so that stepping is difficult.
In order to solve the technical problems, the invention adopts the following technical scheme:
the design is a starting air-pushing device in a large-diameter shield tunnel, and comprises a guide table arranged in parallel, wherein the guide table comprises a horizontal plane and an inclined plane arranged in opposite direction, a guide rail is laid on the inclined plane, grooves distributed at intervals are formed in the horizontal plane of the guide table, fixing holes are formed in the bottom surface of each groove, fixing columns matched with the sizes of the fixing columns are correspondingly installed in the fixing holes, supporting plates are connected to the fixing columns, and counter-force supports used for fixing pushing oil cylinders to push a shield machine are arranged on the supporting plates.
Preferably, the back of the supporting plate is provided with a reinforcing rib.
Preferably, the fixed column is solid round steel.
Preferably, the solid round steel has a diameter of 50 mm.
Preferably, the fixing holes comprise two rows and three columns of fixing holes uniformly distributed on the bottom surface of the groove.
Preferably, the pitch of the grooves is 4 m.
Preferably, a stressed support is arranged on the front side face of the shield tunneling machine.
A method for starting empty pushing in the large-diameter shield tunnel is also designed, and comprises the following steps:
s1, constructing a guide platform and a working well, and paving a guide rail on the guide platform;
s2, forming a groove on the upper surface of the guide table;
s3, drilling a fixing hole in the groove;
s4, repeating the above S2 and S3, and arranging grooves and fixing holes on the guide table at equal intervals;
s5, assembling the shield machine in the working well, and placing the shield machine on the guide rail;
s6, inserting a fixing column into the fixing hole, welding a supporting plate on the fixing column, and welding a counter-force support on the supporting plate;
s7, installing a stressed support on the front side surface of the shield machine, installing a hydraulic oil cylinder between the stressed support and a counter-force support, and pushing the shield machine to advance;
and S8, repeating S6 and S7 at the next groove after the shield machine advances for a groove distance, and so on until the shield machine steps to the design mileage.
Further, the fixing posts are preset in advance in step S4.
Furthermore, the connection of the counter-force support and the support plate is made in advance.
Compared with the prior art, the invention has the beneficial technical effects that:
1. the bracket is characterized in that the bracket groove is formed in the bottom of the bracket groove, and the bracket groove is formed in the bottom of the bracket groove.
2. The invention adopts a plurality of round steel as the support, disperses the thrust received by the counterforce support, increases the bearing capacity and the service time of the support, and increases the stepping-circulating distance by prolonging the service time.
3. The interval of the grooves is smaller than the distribution interval of the traditional bracket grooves, so that the working procedures are saved, and the construction process is accelerated.
Drawings
FIG. 1 is a schematic structural diagram of an originating empty thrust unit in a large-diameter shield tunnel in the prior art;
FIG. 2 is a cross-sectional view of a prior art starting thrust device in a large diameter shield tunnel;
FIG. 3 is an enlarged view of A in FIG. 2;
FIG. 4 is a schematic structural diagram of a track of an initiating thrust reverser in a large-diameter shield tunnel in the prior art;
FIG. 5 is a schematic structural diagram of an originating empty pushing device in a large-diameter shield tunnel according to the present invention;
FIG. 6 is a cross-sectional view of the starting thrust device in a large-diameter shield tunnel according to the present invention;
FIG. 7 is an enlarged view of B in FIG. 6;
FIG. 8 is a schematic structural view of a guide table groove of the starting air-pushing device in the large-diameter shield tunnel according to the present invention;
FIG. 9 is a schematic structural diagram of a guide rail of an originating air-pushing device in a large-diameter shield tunnel according to the present invention;
in the figure, 1 is a shield machine, 2 is a base, 3 is a guide table, 4 is a groove, 5 is round steel, 6 is a guide rail, 7 is a steel backing plate, 8 is a bracket groove, 9 is a hydraulic oil cylinder, 10 is a ribbed plate, 11 is a support column, 12 is a support bracket, 13 is a connecting plate, 21 is a support plate, 22 is a reinforcing rib, and 23 is a counter-force support.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
Example 1: a large-diameter shield tunnel internal starting air-pushing device is disclosed, and comprises a concrete guide platform 3 oppositely built on a base 2, wherein a horizontal plane is arranged on the guide platform 3, a slope is arranged on the side surface of the concrete guide platform, a guide rail 6 is laid on the slope, the cross section of the guide rail 6 is I-shaped, rib plates 10 which play a role of fixing are welded on two sides of the guide rail 6, steel backing plates 7 are pre-embedded below the guide rail 6, the width and the length of each steel backing plate 7 are 120mm and 350mm, the interval between the two steel backing plates 7 is 750mm, and U-shaped threaded steel bars with the diameter of 20mm are welded on two sides of each steel backing plate 7 and are welded and fixed with a steel bar mesh in the guide platform.
In the traditional shield air-pushing mode, a bracket stepping mode is adopted, referring to fig. 1, bracket grooves 8 are arranged on two sides of a guide rail 6 on a slope of a guide table 2, a supporting column 11 is inserted into the bracket groove 8, the supporting column 11 is a box-shaped column body formed by welding steel plates, the size of the supporting column is the same as that of the bracket slot 8, the supporting column can cling to the inner wall of the bracket slot 8, the supporting bracket 12 is placed on the slope and abuts against the supporting column 11, since the support bracket 12 does not slide downward due to its own weight and friction with the slope, the front side section of the support bracket 12 is relatively large, it can be used alone to support hydraulic ram 9, but in the propulsion of large diameter shield machines, the weighing force of a single corbel is not sufficient, therefore, a front group and a rear group of fixing modes are adopted, two parallel supporting brackets 12 are welded together through a connecting plate 13, and the hydraulic oil cylinder 9 is propped against the connecting plate 13 to push the shield tunneling machine 1 to advance.
However, in the use process of the conventional air pushing device, because the diameter of the shield tunneling machine is large and the self weight is large, even though the two groups of supporting brackets 12 are welded together, the concrete behind the bracket groove 8 can still be crushed, and in the stepping process, because the brackets are heavy, when the device moves forwards, the device needs to cut off the two groups of fixed brackets again to move, so that the operation procedures are increased, and the construction period can be prolonged.
For the above reasons, the present embodiment employs the air-pushing device shown in fig. 5 to 9, which also includes the guide table 3 and the guide rail 6, one groove 4 is provided on the upper surface of the guide table 3 at intervals of 4m, the groove 4 is formed by casting after a box is bound by square timbers with the width of 5cm is installed, the length is 1.4m, the width is 0.8m, two rows and three rows of fixing holes are arranged on the bottom surface of the groove 4, round steel 5 is inserted into the fixing holes, the diameters of the round steel 5 and the fixing holes are the same and are 50mm, the supporting plate 21 is welded on the round steel 5, the thickness of the supporting plate 21 is 40mm, the supporting plate and the round steel 5 are connected into an integral stress system by adopting a perforation welding mode, the supporting plate 21 and the groove 4 are the same in size, four side faces of the supporting plate 21 and the groove 4 can be tightly attached, a reaction support 23 is welded on the upper surface of the supporting plate 21, a reinforcing rib plate 22 is welded behind the reaction support 23, and the hydraulic oil cylinder 9 pushes the shield tunneling machine 1 to advance by abutting against the reaction support 23.
The method for carrying out the empty pushing of the shield machine by using the starting empty pushing device in the large-diameter shield tunnel comprises the following steps:
s1, firstly, building a working well and a guide table 3 on the base 2 in the early stage, and paving a guide rail on the guide table 3; s2, forming a groove 4 with the length of 1.4m, the width of 0.8m and the height of 0.05m on the upper surface of the guide table 3; s3, drilling 300mm deep holes in the grooves 4 by using a 50mm core bit, and drilling 6 holes in each groove; s4, repeating the steps S2 and S3, arranging a groove on the guide table every 4m, drilling a fixed hole, drilling the fixed hole after each groove 4 is arranged, then arranging the next groove 4, and so on, or firstly manufacturing all the grooves 4, and then uniformly drilling; s5, the shield machine is put into the well, the shield machine is assembled in the working well, and the shield machine is placed on the guide rail; s6, inserting round steel of 50mm into a fixing hole in a groove in front of a shield machine, welding a supporting plate on the round steel, welding a counter-force support on the supporting plate in a direction opposite to the shield machine, and welding a reinforcing rib behind the counter-force production, wherein the supporting plate and the round steel are connected into an integral stress system in a perforation welding mode; s7, installing a stressed support on the front side surface of the shield machine, wherein the stressed support is a rectangular steel plate and is welded on the shield machine, installing a hydraulic oil cylinder between the stressed support and a counter-force support in order to increase the stressed area of the shield machine, and pushing the shield machine to advance along with the extension and contraction of the hydraulic oil cylinder; and S8, repeating S6 and S7 at the next groove after the shield machine advances for a groove distance, and so on until the shield machine steps to the design mileage.
In order to simplify the operation, the round steel can be arranged in advance after the drilling in S4 is finished, and only the supporting plate and the reaction support need to be welded after the drilling; in addition, the welding between the supporting plate and the counter-force support can be prefabricated in advance, and the welding is not carried out in the construction process, so that the construction period is shortened.
While the present invention has been described in detail with reference to the drawings and the embodiments, those skilled in the art will understand that various specific parameters in the above embodiments can be changed without departing from the spirit of the present invention, and a plurality of specific embodiments are formed, which are common variation ranges of the present invention, and will not be described in detail herein.
Claims (10)
1. A starting empty pushing device in a large-diameter shield tunnel comprises guide platforms which are arranged in parallel, wherein each guide platform comprises a horizontal plane and an inclined plane which is arranged oppositely, and guide rails are laid on the inclined planes; the supporting plate and the groove are the same in size, and four side faces of the supporting plate and the groove can be tightly attached.
2. The initiating empty pushing device in the large-diameter shield tunnel according to claim 1, wherein reinforcing ribs are arranged on the back of the supporting plate.
3. The initiating empty pushing device in the large-diameter shield tunnel according to claim 1, wherein the fixing column is solid round steel.
4. The large-diameter shield tunneling initiation empty-pushing device as claimed in claim 3, wherein the solid round steel is 50mm in diameter.
5. The initiating empty pushing device in a large-diameter shield tunnel according to claim 1, wherein the fixing holes comprise two rows and three columns of fixing holes uniformly distributed on the bottom surface of the groove.
6. The initiating empty pushing device in the large-diameter shield tunnel according to claim 1, wherein the distance between the grooves is 4 m.
7. The initiating empty pushing device in the large-diameter shield tunnel according to claim 1, wherein a stressed support is arranged on the front side surface of the shield machine.
8. A method for starting empty pushing in a large-diameter shield tunnel is characterized by comprising the following steps:
s1, constructing a guide platform and a working well, and paving a guide rail on the guide platform;
s2, forming a groove on the upper surface of the guide table;
s3, drilling a fixing hole in the groove;
s4, repeating the above S2 and S3, and arranging the grooves and the fixing holes on the guide table at equal intervals;
s5, assembling the shield machine in the working well, and placing the shield machine on the guide rail;
s6, inserting a fixing column into the fixing hole, welding a supporting plate on the fixing column, and welding a counter-force support on the supporting plate;
s7, installing a stressed support on the front side surface of the shield machine, and installing a hydraulic oil cylinder between the stressed support and a counter-force support to push the shield machine to advance;
and S8, repeating S6 and S7 at the next groove after the shield machine advances for a groove distance, and so on until the shield machine steps to the design mileage.
9. The method for initiating empty pushing in the large-diameter shield tunnel according to claim 8, wherein the fixing posts are preset in advance in step S4.
10. The method for launching empty thrust in a large-diameter shield tunnel according to claim 8, wherein the connection between the reaction force support and the supporting plate is prefabricated before S1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910797012.4A CN110486025B (en) | 2019-08-27 | 2019-08-27 | Starting empty pushing device and method in large-diameter shield tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910797012.4A CN110486025B (en) | 2019-08-27 | 2019-08-27 | Starting empty pushing device and method in large-diameter shield tunnel |
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| CN110486025A CN110486025A (en) | 2019-11-22 |
| CN110486025B true CN110486025B (en) | 2020-12-22 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111335905B (en) * | 2020-03-06 | 2021-03-02 | 广东水电二局股份有限公司 | Air-pushing stepping device and method for open tunnel boring machine |
| CN113931640B (en) * | 2021-10-15 | 2024-04-12 | 中国建筑第六工程局有限公司 | Construction method for shield empty pushing and starting in mine tunnel |
| CN113982610B (en) * | 2021-10-25 | 2024-01-09 | 中铁广州工程局集团有限公司 | Concrete receiving guide table structure and construction method |
| CN115012969A (en) * | 2022-07-08 | 2022-09-06 | 上海弥涅科技有限公司 | Shield constructs quick-witted propulsion equipment that slides |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204402559U (en) * | 2015-01-26 | 2015-06-17 | 粤水电轨道交通建设有限公司 | A kind of large jacking force shield machine air pushes through hole truss-like reaction support group |
| CN206816263U (en) * | 2017-06-26 | 2017-12-29 | 中铁四局集团有限公司 | Translation lifting device for semi-closed station shield machine |
| CN108442933B (en) * | 2018-03-02 | 2020-11-24 | 中铁十二局集团有限公司 | Shield starting base and shield starting method |
| CN109057810B (en) * | 2018-08-30 | 2023-08-22 | 中国水利水电第十四工程局有限公司 | Construction method and auxiliary device for shield air-pushing through mine tunnel |
| CN109026036B (en) * | 2018-09-21 | 2019-11-29 | 中南大学 | A kind of shield machine air pushing step device |
| CN109268021B (en) * | 2018-11-08 | 2020-09-11 | 中交二公局第三工程有限公司 | Air-thrust counterforce support of double-spliced H-shaped steel assembled shield tunneling machine |
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