CN106640105A - Soft land layer shield pile grinding system and pile grinding method - Google Patents
Soft land layer shield pile grinding system and pile grinding method Download PDFInfo
- Publication number
- CN106640105A CN106640105A CN201710077012.8A CN201710077012A CN106640105A CN 106640105 A CN106640105 A CN 106640105A CN 201710077012 A CN201710077012 A CN 201710077012A CN 106640105 A CN106640105 A CN 106640105A
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- Prior art keywords
- layer shield
- soil layer
- soft soil
- shield machine
- wedge shape
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000004567 concrete Substances 0.000 claims abstract description 22
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 4
- 239000002689 soil Substances 0.000 claims description 67
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000005493 welding type Methods 0.000 claims description 9
- 239000000956 alloy Substances 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 abstract description 11
- 230000002787 reinforcement Effects 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- 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
- E21D9/08—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining with additional boring or cutting means other than the conventional cutting edge of the shield
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a soft land layer shield pile grinding system and pile grinding method. The problems that when a soft land layer shield machine is used for conducting shield grinding on concrete reinforcement bars of existing building pile foundations in shield tunnels, segment cutting of the reinforcing bars is difficult, and great influences on the stability of an existing structure are generated are solved. The soft land layer shield pile grinding system comprises the soft land layer shield machine and a reinforced concrete pile foundation of the existing structure, and a variable-speed pump is configured in a propelling system of the soft land layer shield machine. The system is characterized in that a gas channel conversion switch valve is connected to an output gas channel of the variable-speed pump of the propelling system of the soft land layer shield machine in series, and a constant-speed flow pump is connected to another input port of the gas channel conversion switch valve; a cutter disc of the soft land layer shield machine is used for grinding the reinforced concrete pile foundation of the existing structure. The effect of reducing disturbance of the ground pile foundation as much as possible is achieved, and the possibility that the pile foundation ground generates significant subsidence is reduced.
Description
Technical field
The present invention relates to the system that a kind of soft soil layer shield machine shield is ground existing buildings concrete pipe base, especially relates to
And one kind is in down town Tunnel Boring subway tunnel, the steel of existing buildings is ground come shield using soft soil layer shield machine
The system and mill piling method of reinforced concrete pile foundation.
Background technology
When urban central zone carries out subway shield tunnel construction, due to depositing for existing building pile foundation and existing underground utilities
Subway planning circuit is set to need the situation of shield crossing city existing pile foundation more and more.Because existing buildings carry
How the critical function in city, make shield-tunneling construction process, does not affect normally using for existing buildings, becomes shield-tunneling construction and faces
New problem.It is interval in subway tunnel shield, run into the situation for needing to be cut off to existing pile foundation sometimes, such situation,
General employing removes former structures, and carries out ground pile pulling, or the mode of stake is dug after excavating shaft, and obstacle pile is torn open in advance
Remove, to ensure the normal construction of shield, but such construction method is present on surrounding enviroment impact greatly, and construction cost is high and long in time limit
Defect, particularly in urban central zone, limited by environmental objective factors, such construction method cannot be implemented.
Soft soil layer shield machine is a kind of equipment that constructing tunnel is carried out in soft soil layer, is come with respect to compound shield
Say, low with equipment cost, cutter head structure is simple, safeguards easy advantage.During soft soil layer shield-tunneling construction, when running into
During armored concrete existing buildings pile foundation, how run into existing buildings are blocked using soft soil layer shield machine
Concrete pipe base, is in the urgent need to address in construction to ensure the stable of ground existing buildings, safety and uninterruptedly use
Problem.What is be equipped with due to the propulsion system of soft soil layer shield machine is speed-variable pump propulsion system, speed-variable pump be cutter head of shield machine to
The power source of front propulsion.Soft soil layer shield machine in construction, cut off during armored concrete existing buildings pile foundation by shield,
The forward thrust of cutter head of shield machine depends primarily on speed-variable pump, unstable due to speed-variable pump output gas flow, cause cutterhead to
The speed of front propulsion mill stake is also unstable, makes the mill stake operation of shield machine driver scene be not easy control.In addition, existing weak soil ground
The cutterhead of layer shield machine, not with the ability of cutting armored concrete, the particularly configuration of central cutter, it is impossible to competent Cutting Steel
The task of muscle, its cutterhead is fixed a cutting tool the arrangement of track, cannot also the concrete reinforcement that ground stake is cut be cut into into segment, and Jing often sends out
Raw cutterhead is wound the phenomenon of clamping stagnation by reinforcing bar is ground.
The content of the invention
The invention provides a kind of soft soil layer shield mill stake system and its mill piling method, solve soft soil layer shield machine
When shield is ground the armored concrete of the existing buildings pile foundation on shield interval, the reinforcing bar cutting that exists is difficult and to existing
The larger technical problem of the stabilizing influence of structures.
The present invention is to solve above technical problem by the following technical programs：
A kind of soft soil layer shield grinds stake system, including the steel bar concrete pile of soft soil layer shield machine and existing buildings,
Speed-variable pump is configured with the propulsion system of soft soil layer shield machine；Characterized in that, in the propulsion system of soft soil layer shield machine
In the output gas circuit of the speed-variable pump of system, a gas circuit permutator valve is in series with, in another input of the gas circuit permutator valve
Constant speed flow pump is connected with mouthful；The cutterhead of soft soil layer shield machine is grinding on the steel bar concrete pile of existing buildings
's.
In-line is provided with six shell knives on the center tool rest of the cutterhead of soft soil layer shield machine, adjacent two
Be 10 centimetres the spacing of shell knife, six the every height shell knife in shell knife be from cutter head center to cutterhead edge according to
Secondary reduction, the height apart from the nearest shell knife in cutterhead edge is higher by 20 centimetres of cutter head panel；In soft soil layer shield
On the cutterhead plane domain of machine, knife spacing is 100 millimeters；On the cutterhead side circular arc sector of soft soil layer shield machine, knife spacing
For 50 millimeters.
Wedge shape dual-pilot cutter is provided with cutterhead spoke；On the cutterhead of soft soil layer shield machine, cutter path radius is little
On 1985 millimeters of region, two wedge shape dual-pilot cutters are provided with each cutter path line, in this two wedge shape dual-pilot cutters
The height of one wedge shape dual-pilot cutter is 200 millimeters, and another height wedge shape dual-pilot cutter in this two wedge shape dual-pilot cutters is 170
Millimeter；On the cutterhead of soft soil layer shield machine, on region of the cutter path radius more than 1985 millimeters, each cutter path
It is provided with line wantonly wedge shape dual-pilot cutter, this height of wedge shape dual-pilot cutter is wantonly 200 millimeters in wedge shape dual-pilot cutter, this
Four is 170 millimeters the height of wedge shape dual-pilot cutter another three in wedge shape dual-pilot cutter.
Wedge shape dual-pilot cutter is welding type, and the two ends of the wedge shape dual-pilot cutter of welding type are provided with arc hard alloy blocks,
There is hard alloy bar in the middle setting of the wedge shape dual-pilot cutter of welding type；It is additionally provided with the cutterhead of soft soil layer shield machine and scrapes
Knife, the height of scraper is 140 millimeters.
A kind of soft soil layer shield grinds piling method, it is characterised in that when the cutterhead of soft soil layer shield machine is apart from precut
Existing buildings 50 centimetres of steel bar concrete pile when, start speed-variable pump in the propulsion system of soft soil layer shield machine
The gas circuit permutator valve connected on air delivering pipeline, the hydraulic speed-changing pump of Thrust System of Shield Tunneling Machines is replaced with constant speed flow pump, this
When shield machine thrust provided by constant speed flow pump；The fltting speed for controlling cutterhead is 1-2 millimeters per minute, makes soft soil layer shield
Machine pushes ahead the steel bar concrete pile of grinding existing buildings under constant speed, until by the reinforcing bar of existing buildings
Till concrete pipe base cuts off.
When shield machine fltting speed is constant, the pile foundation disturbance to being ground is just little, it is to avoid shield drilling depth is too fast, causes knife
Disk is stuck.Up to 10 centimetres lower of reinforcing bar is cut simultaneously, it is to avoid reinforcing bar is wrapped on cutterhead, and then the impact later stage normally digs
Enter, Tu Cang and screw machine are slagged tap will not also produce catching phenomenon.
The present invention mainly realizes shield machine by the hydraulic speed-changing pump of constant speed flow pump replacement Thrust System of Shield Tunneling Machines
Grinding to the constant low speed of existing buildings pile foundation, instead of the mode for manually controlling shield machine radial grinding, reach
The purpose of stable grinding pile foundation, blocks to existing pile foundation, and making to be rubbed reinforcing bar will not produce downward drag force, play
The perturbation action for being ground pile foundation is reduced as far as possible, reduces the possibility that significantly settling occurs in pile foundation ground.In shield once
Property driving in, without the need for changing cutter.
Description of the drawings
Fig. 1 is the structural representation of the soft soil layer cutter head of shield machine of the present invention；
Fig. 2 is six structures shell knife 1 in overlook direction arranged on the center tool rest 5 of cutter head of shield machine of the present invention
Schematic diagram；
Fig. 3 is six structures shell knife 1 in side-looking direction arranged on the center tool rest 5 of cutter head of shield machine of the present invention
Schematic diagram；
Fig. 4 is the structural representation of the shell knife of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is described in detail：
In soft soil layer shield-tunneling construction under the riverbed of down town inland river, the bridge of a heavy traffic is provided with inland river,
The part pile foundation of the bridge is arranged on shield interval, how in the case where bridge normal pass is ensured, completes the portion on shield interval
The shield excision for dividing bridge pile foundation is problem in the urgent need to address in construction.Because the cutterhead of soft soil layer shield machine is in grinding
During steel bar concrete pile, when cutterhead and bridge pier reinforcing bar are ground, the cutterhead power that is hampered can change, and the change of this resistance
The speed-variable pump of propulsion system outfit can be delivered to by cutter-devices system, speed-variable pump is bigger to export by changing gas output
Grinding force, whole process finally show shield cutter jumping characteristic cutting bridge pier pile foundation reinforcing bar, to bridge pier pile foundation reinforcing bar meeting
Produce downward drag force, cause bridge pier top pontic by fluctuation, and the body of a bridge rocks cracking.A kind of soft soil layer shield mill
Stake system, including the steel bar concrete pile of soft soil layer shield machine and existing buildings, in the propulsion of soft soil layer shield machine
Speed-variable pump is configured with system；In the output gas circuit of the speed-variable pump of the propulsion system of soft soil layer shield machine, one is in series with
Gas circuit permutator valve, on another input port of the gas circuit permutator valve constant speed flow pump is connected with；Soft soil layer shield
The cutterhead of machine is grinding on the steel bar concrete pile of existing buildings.When the cutterhead of soft soil layer shield machine is ground to shield
Before the existing bridge pile foundation of the needs excision on structure interval during 20 centimeters, by the hydraulic pressure in soft soil layer Thrust System of Shield Tunneling Machines
Speed-variable pump is turned off, and is replaced with constant speed flow pump, then controls cutterhead and at the uniform velocity pushes ahead cutting bridge pile foundation；Although cutterhead runs into
Resistance can change after reinforcing bar, but because the air-flow of constant speed flow pump output is constant, so can guarantee that cutterhead is substantially even
Speed cutting pile foundation reinforcing bar, make cutterhead cutting bridge pier reinforcing bar when, the drag force of fluctuation will not be produced, it is ensured that the body of a bridge it is basic
It is stable.
In-line is provided with six shell knives 1 on the center tool rest 5 of the cutterhead of soft soil layer shield machine, it is adjacent
The spacing of two shell knives is 10 centimetres, and six is from cutter head center to cutterhead side the every height shell knife in shell knife 1
What edge was reduced successively, the height apart from the nearest shell knife in cutterhead edge is higher by 20 centimetres of cutter head panel；To strengthen weak soil
Cutting power of the cutter head of shield machine to reinforcing bar；On the cutterhead plane domain of soft soil layer shield machine, knife spacing is 100 millimeters；
On the cutterhead side circular arc sector of soft soil layer shield machine, knife spacing is 50 millimeters；Make shield cutting under bridge pier reinforcing bar into
For segment, to prevent from being wound on cutterhead, and be conducive to the conveying deslagging of conveying worm.
Wedge shape dual-pilot cutter 2 is provided with cutterhead spoke 3；On the cutterhead of soft soil layer shield machine, cutter path radius
On region less than 1985 millimeters, two wedge shape dual-pilot cutters 2 are provided with each cutter path line, this two wedge shape dual-pilot cutters 2
In one be 200 millimeters the height of wedge shape dual-pilot cutter, another height wedge shape dual-pilot cutter in this two wedge shape dual-pilot cutters 2
For 170 millimeters；On the cutterhead of soft soil layer shield machine, on region of the cutter path radius more than 1985 millimeters, each knife
It is provided with wantonly wedge shape dual-pilot cutter 2 in tool trajectory, this is wantonly the height of wedge shape dual-pilot cutter in wedge shape dual-pilot cutter 2
200 millimeters, this height of wedge shape dual-pilot cutter is wantonly 170 millimeters another three in wedge shape dual-pilot cutter.
Wedge shape dual-pilot cutter 2 is welding type, and the two ends of the wedge shape dual-pilot cutter 2 of welding type are provided with arc hard alloy blocks
6, there is hard alloy bar 7 in the middle setting of the wedge shape dual-pilot cutter 2 of welding type, to strengthen the cutting to reinforcing bar；In soft soil layer
Scraper 4 is additionally provided with the cutterhead of shield machine, the height of scraper is 140 millimeters.
A kind of soft soil layer shield grinds piling method, when soft soil layer shield machine cutterhead apart from precut existing buildings
50 centimetres of steel bar concrete pile when, start and gone here and there on the air delivering pipeline of the speed-variable pump in the propulsion system of soft soil layer shield machine
The gas circuit permutator valve of connection, the hydraulic speed-changing pump of Thrust System of Shield Tunneling Machines is replaced with constant speed flow pump, now shield machine thrust
There is provided by constant speed flow pump；The fltting speed for controlling cutterhead is 1-2 millimeters per minute, makes soft soil layer shield machine in constant speed
Under, the steel bar concrete pile of grinding existing buildings is pushed ahead, until the steel bar concrete pile of existing buildings is cut
Till disconnected.
Claims (5)
1. a kind of soft soil layer shield grinds stake system, including the reinforced concrete pile of soft soil layer shield machine and existing buildings
Base, in the propulsion system of soft soil layer shield machine speed-variable pump is configured with；Characterized in that, in the propulsion of soft soil layer shield machine
In the output gas circuit of the speed-variable pump of system, a gas circuit permutator valve is in series with, in the another defeated of the gas circuit permutator valve
Constant speed flow pump is connected with entrance；The cutterhead of soft soil layer shield machine is to be ground the steel bar concrete pile in existing buildings
On.
2. a kind of soft soil layer shield according to claim 1 grinds stake system, it is characterised in that in soft soil layer shield machine
Cutterhead center tool rest（5）It is upper that in-line is provided with six shell knives（1）, the spacing of two adjacent shell knives is 10
Centimetre, six shell knife（1）In every height shell knife reduce successively to cutterhead edge from cutter head center, apart from knife
The height of the nearest shell knife of plate edge is higher by 20 centimetres of cutter head panel；In the cutterhead plane domain of soft soil layer shield machine
On, knife spacing is 100 millimeters；On the cutterhead side circular arc sector of soft soil layer shield machine, knife spacing is 50 millimeters.
3. a kind of soft soil layer shield according to claim 2 grinds stake system, it is characterised in that in cutterhead spoke（3）On
It is provided with wedge shape dual-pilot cutter（2）；On the cutterhead of soft soil layer shield machine, region of the cutter path radius less than 1985 millimeters
On, two wedge shape dual-pilot cutters are provided with each cutter path line（2）, this two wedge shape dual-pilot cutters（2）In one wedge shape elder generation
The height of row knife is 200 millimeters, this two wedge shape dual-pilot cutters（2）In another height wedge shape dual-pilot cutter be 170 millimeters；
On the cutterhead of soft soil layer shield machine, on region of the cutter path radius more than 1985 millimeters, set on each cutter path line
It is equipped with wantonly wedge shape dual-pilot cutter（2）, this is wantonly wedge shape dual-pilot cutter（2）In one be 200 millimeters the height of wedge shape dual-pilot cutter, this
Four is 170 millimeters the height of wedge shape dual-pilot cutter another three in wedge shape dual-pilot cutter.
4. a kind of soft soil layer shield according to claim 3 grinds stake system, it is characterised in that wedge shape dual-pilot cutter（2）It is
Welding type, in the wedge shape dual-pilot cutter of welding type（2）Two ends be provided with arc hard alloy blocks（6）, in the wedge shape of welding type
Dual-pilot cutter（2）Middle setting have hard alloy bar（7）；Scraper is additionally provided with the cutterhead of soft soil layer shield machine（4）, scrape
The height of knife is 140 millimeters.
5. a kind of soft soil layer shield grinds piling method, it is characterised in that when the cutterhead of soft soil layer shield machine is apart from precut
During 50 centimetres of the steel bar concrete pile of existing buildings, start the defeated of speed-variable pump in the propulsion system of soft soil layer shield machine
The gas circuit permutator valve connected on air pipe, the hydraulic speed-changing pump of Thrust System of Shield Tunneling Machines is replaced with constant speed flow pump, now
Shield machine thrust is provided by constant speed flow pump；The fltting speed for controlling cutterhead is 1-2 millimeters per minute, makes soft soil layer shield machine
Under constant speed, the steel bar concrete pile of grinding existing buildings is pushed ahead, until the reinforcing bar of existing buildings is mixed
Till solidifying soil pile foundation is cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077012.8A CN106640105A (en) | 2017-02-13 | 2017-02-13 | Soft land layer shield pile grinding system and pile grinding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710077012.8A CN106640105A (en) | 2017-02-13 | 2017-02-13 | Soft land layer shield pile grinding system and pile grinding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106640105A true CN106640105A (en) | 2017-05-10 |
Family
ID=58844857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710077012.8A Pending CN106640105A (en) | 2017-02-13 | 2017-02-13 | Soft land layer shield pile grinding system and pile grinding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106640105A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469491A (en) * | 2018-10-30 | 2019-03-15 | 上海市基础工程集团有限公司 | For cutter head of shield machine arragement construction under plastic draining board geological conditions |
| CN110984149A (en) * | 2019-12-02 | 2020-04-10 | 中建八局轨道交通建设有限公司 | Construction method for pile body pretreatment in shield pile grinding process |
| CN113417651A (en) * | 2021-07-22 | 2021-09-21 | 华东交通大学 | Shield cutter head device for efficiently cutting reinforced concrete structure and working method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109469491A (en) * | 2018-10-30 | 2019-03-15 | 上海市基础工程集团有限公司 | For cutter head of shield machine arragement construction under plastic draining board geological conditions |
| CN110984149A (en) * | 2019-12-02 | 2020-04-10 | 中建八局轨道交通建设有限公司 | Construction method for pile body pretreatment in shield pile grinding process |
| CN113417651A (en) * | 2021-07-22 | 2021-09-21 | 华东交通大学 | Shield cutter head device for efficiently cutting reinforced concrete structure and working method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20170510 |