CN102277898B - Drain pipe jacking construction method - Google Patents

Drain pipe jacking construction method Download PDF

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Publication number
CN102277898B
CN102277898B CN 201110119467 CN201110119467A CN102277898B CN 102277898 B CN102277898 B CN 102277898B CN 201110119467 CN201110119467 CN 201110119467 CN 201110119467 A CN201110119467 A CN 201110119467A CN 102277898 B CN102277898 B CN 102277898B
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China
Prior art keywords
jacking
iron
head
jack
pipe
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CN 201110119467
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Chinese (zh)
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CN102277898A (en
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朱奎
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温州市金誉建设监理有限公司
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Publication of CN102277898A publication Critical patent/CN102277898A/en
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Abstract

The invention discloses a drain pipe jacking construction method. The method is characterized by comprising the following steps of: (1) surveying and setting out; (2) constructing in a working shaft; (3) installing an assembly thrust wall; (4) installing guide rails; (5) installing a main jack; (6) installing an oil pump; (7) installing jacking iron; (8) constructing and sealing inside and outside the tunnel; (9) jacking pipelines: immediately starting jacking the machine head after dismantling a sealed door, and starting a slurry adding system to inject slurry after jacking the machine head by 300mm; and (10) removing oil. The method has the advantages of fast construction progress and obvious social benefits.

Description

Gutter jacking construction method

Technical field

The present invention relates to the construction project field, particularly a kind of gutter jacking construction method.

Background technology

Bigger to the soil disturbance around the body in the gutter jacking construction process, be difficult to keep the stable of excavation surface, the surface settlement that causes in the work progress is also bigger, influences underground all kinds of pipeline, road traffic and above ground structure safety easily.If gutter is handled excavation face lateral earth pressure and groundwater pressure well in the jacking construction process, just can effectively control the stable of the soil body, guarantee the safety of various ground environments.

Summary of the invention

At the deficiencies in the prior art, the object of the present invention is to provide a kind of gutter jacking construction method.

The present invention is when the development machine operate as normal, and cutterhead is close to the soil body section that is cut by predefined pressure, and the one side rotary cutting soil body under the effect of top power is pushed ahead the balance of keeping the soil body on the one hand in the wings.If soil body hardness increases in the jacking, push up fastly when constant, cutterhead is subjected to head resistance greater than the cutterhead pressure that presets, and cutterhead is withdrawal backward gradually, keeps cutterhead constant to the pressure of the soil body.When cutterhead was withdrawn, the Tu Kou that cuts of cutterhead increased automatically, and the amount of the cutting soil body increases, and the soil body reduces the pressure of cutterhead, and soil pressure increases, and cutterhead still keeps balance with soil pressure and the soil body that presets at reposition.Cooperate the manual adjustments cutterhead to cut the regulatory function of Tu Kou and preset pressure size, make soil body lateral pressure obtain point-device balance.Manual-lock is cut Tu Kou during shutdown, and cutterhead still keeps predetermined pressure to be close to the soil body, and muddy water storehouse and excavation face are isolated.No matter the soil body is crossed softly or really up to the mark, and when automatic adjustable range value of reaching the limit of, the cutterhead warning device is reported to the police, and reminds operating personnel to note, by regulating top speed, resets means such as cutterhead pressure, makes the soil body keep new balance.

The present invention injects the mud of certain pressure to the excavation storehouse, this mud by the size of control mud extraction flow, thereby simply and is exactly controlled water pressure in the muddy water storehouse, balance underground water except the particle in the soil layer can being taken away.

Construction sequence comprises:

(1) measures unwrapping wire

Lay temporary bench mark and conduit axis control stake, during the construction line-putting, establish Center stake every 20m, the place arranges Center stake at manhole.

(2) active well construction

The steel bar concrete precast plate is installed in active well reservation notch suitable for reading, is wanted the seat slurry full in the notch.The wall of laying bricks at precast plate reserved opening place, all bricks are wanted saturated with water, and Ying Manpu, full squeezing are taken block up and down when building by laying bricks or stones, and thickness of mortarat bed joint and perpends width should be even, and vertical straight joint must not be arranged.When building manhole by laying bricks or stones, should install synchronously and mark time, want accurately the position, and the installation back of marking time must not trampled before masonry mortar reaches regulation compressive strength.Well inwall front cover should divide two-layer smearing into, strikes off and make the surface to cause coarse line after first road is smeared into; After the second road mortar dries, compacting troweling at twice.Slurry and the interlayer of the basic unit close and firm that should bond must not have phenomenons such as hollowing and crackle.The planeness of wiping one's face should be greater than 15mm.After plastering mortar solidifies, should keep moist curing, curing time is no less than 14d.

(3) parados is installed behind the assembling

The parados back soil body must be evenly closely knit behind the assembling, and wall should be smooth, and vertical with pipeline jacking direction; Back soil body wall should be close to the back parados, should adopt the filling of sandstone material closely knit when hole is arranged.The bottom of parados following 500mm at the bottom of working pit behind the assembling, thus make back jack center of effort highly be not less than 1/3 of back lumps of wood height, the point of making a concerted effort of being broken ground behind origin of force and the wall is consistent.Parados verticality allowable variation is parados height behind 0.1% assembling behind the assembling, and horizontal torsion degree allowable variation is parados length behind 0.1% assembling.

(4) guide rail is installed

When guide rail is installed and active well base plate pre-embedded steel slab weld, and support with shaped steel and to enclose the jail.To check the pipeline center position earlier before guide rail is installed, guarantee that the elevation of guide rail, axial location are accurate.The rail axis position deviation is no more than 3mm, and the elevation of top surface deviation is no more than 3mm, is no more than 2mm apart from deviation in two rails.The guide rail end can not be too far away apart from the work wall, should control about 500mm, and reserving seam when guide rail is installed highly is 100~150mm.Whenever advance pipe joint and should proofread guide rail elevation, center line and level, and along with guided way is in time proofreaied and correct in the variation of pipeline jacking load.

(5) main top jack installation

Jack will be that axial symmetry is arranged with the pipe centerline.Main top oil cylinder frame is installed and is wanted accurate positioning, guarantees the correct position of cylinder force point, and its elevation and plane alignment error should be controlled in 3mm.The oil cylinder errors of centration that is installed on the oil cylinder frame is controlled in 3mm.Jack is fixed on the support, and its central point of making a concerted effort is on pipe centerline; The oil circuit of jack should be in parallel, and every jack should have oil-feed, move back oily control system.The position of jack is positioned at 1/3~1/4 place of pipeline perpendicular diameter, makes jack make a concerted effort the position of position and jacking drag on same axis, avoids producing the top couple, makes pipeline generation vertical error.

(6) oil pump is installed

Oil pump is arranged near the jack, and oil pipe is straight, corner is few; Oil pump should be complementary with jack, and emergency bearing oil pump is arranged; Oil pump installs, and carries out test running.Slowly carry out when jacking begins, treat each contact site driving fit after, again by normal move speed jacking; If find that oil pressure increases suddenly, stop jacking immediately in the jacking, check reason and continue jacking after treatment; When jack piston was return, oil pressure was not too much, and speed must not be too fast.

(7) top iron is installed

Top iron adopts the cast-steel integral casting or adopts the shaped steel welding fabrication.The vertical top of single file iron center line is consistent with conduit axis; Two center lines of the vertical top of duplicate rows iron are parallel, and equate with the tubular axis linear distance, and will be perpendicular to the pipe end plane.The adjacent surface of top iron is orthogonal, on the iron of top locking device is arranged, and top iron should be able to keep stable when placing.When vertically top iron contacts with the pipe end face, must make vertical top iron origin of force height and position be positioned at external diameter 1/3~1/4 place, cause preceding pipe to bow to prevent that origin of force is too high.When top power was big, the pipe end face should add arched top iron steel plate, to increase the lifting surface area of pipe end, improved its stressing conditions, prevented that pipe from damaging when top power is excessive.When changing top iron, use the big top iron of length earlier, should lock after the iron assembly unit of top.Should adopt the padded coaming liner between top iron and the mouth of pipe, when top power during near the permission compressive strength of tube coupling material, pipe end should increase circular top iron.During jacking, the staff must not be above the iron of top and the side stop, and observe top iron at any time no abnormal sign arranged.

(8) construction of turnover hole and sealing

Equipment installs the back a complete set of jacking equipment of reply and does the primary system debugging, after definite jacking equipment operation is all right, and beginning jacking work.When growing apart from jacking, be to reduce the jacking resistance, make sealing ring at the portal place so that the thixotropic slurry performance drag-reduction effect that pours into.

(9) pipeline jacking

After dismounting is sealed up a door, should begin the jacking head immediately, after the jacking 300mm, unlatching adds the mud system and injects mud, in order to regulate the creeping of dregs and keep earth pressure balance.When head just buries, because head does not have enough resisting moment in orbit, head easily produced rotation when cutterhead was rotated, so when the initial 2m that buries, move speed is controlled below 5mm/min, to prevent the head rotation, and observation airplane head inclination angle and the anglec of rotation incessantly, the inclination angle changes with the levelling of correction jack, and the anglec of rotation is greater than ± 50, and cutterhead is opened the counter-rotating levelling; Under the non-rotary situation of head behind the jacking 2m, strengthen move speed gradually.When head did not bury as yet fully, native storehouse pressure was controlled at 0.1~0.15MPa.After head all buried, first pipe joint was done rear enclosed down.After rear enclosed is intact, annotate the space of cement mortar filling head outside backbreaking at 1: 2 to the head shell injected hole, grouting pressure is controlled at 0.4MPa.The hole soil property is unstable when preventing that head from just appearing produces landslide, locates built-in rigidity piston ring at the hole.Rear enclosed adopts the ring-shaped rubber plate to be close to the soil body, and the hole side wall covers pressure with doughnut-shaped steel plate, and the slurry phenomenon takes place when preventing from annotating thixotropic slurry to run.Control native storehouse pressure according to predefined parameter during jacking, meet sand gravel layer, when nearer apart from building, soil pressure is set suitably and is strengthened, and improves safety factor.The thixotropic slurry drag reduction is the drag reduction mode that the long-distance pipe jacking construction is often adopted, and can effectively reduce resistance, lengthens apex distance to greatest extent.Be provided with the thixotropic slurry injected hole at the head afterbody, every joint concrete reinforced pipe is established injected hole, slip casting at any time during jacking.Move speed control is used low speed at 30~50mm/min when preceding 30m and correction, and looking afterwards is unearthed stirs, the cutterhead torque condition is suitably accelerated move speed.Under when managing, stop under the jacking state at head, cutterhead idle running 3~5min closes conveying worm spoil disposal hydraulic pressure door when shutting down, and outage is to guarantee soil pressure storehouse soil pressure.

If center, elevation deviation then will stop jacking immediately greater than ± 20mm, correction is proofreaied and correct and should slowly be carried out, and tube coupling is resetted gradually, must not entangle vigour suddenly.When wherein rectifying a deviation elevation, the pipe on the track will add counterweight; During the correction center, the pipe on the track will add supported on both sides.After head is all gone into the hole, and elevation, centre deviation will in time adopt the head correcting device to rectify a deviation during greater than 10mm, and the center is controlled in 5mm, and high process control is in ± 10mm, and tool heads self straightening method is adopted in bearing calibration.The effective control tool head of this method for correcting error is the state of four direction up and down, and the amplitude of at every turn rectifying a deviation is a unit with 5mm, measures off normal according to the inclinometer of tool heads and laser transit and judges, if when trend does not reduce, increases the correction dynamics; If when trend is stablized or reduced, should keep this correction dynamics, continue jacking; When off normal trend is opposite, then need the correction dynamics is reduced gradually.In the pipeline jack-in process, if move speed is on the low side in the powder fine sand soil layer, turn down the into concentration of hydraulic mixture of mud, reduce move speed.When running into the different soil layer of soft or hard degree, judge geological conditions by the torque of cutterhead.If hardening suddenly then should add water or mud in native storehouse.

(10) be unearthed

The soil that excavates in the push-bench course of work is transported on the belt conveyer through conveying worm earlier, is transported in the battery truck through belt conveyer again, and battery truck is transported to active well, and Tu Chang is deposited on last vertical handling to ground, outward transport regularly.

The present invention has that construction speed is fast, the advantage of obvious social benefit.

The specific embodiment

The present embodiment construction sequence comprises:

(1) measures unwrapping wire

Lay temporary bench mark and conduit axis control stake, during the construction line-putting, establish Center stake every 20m, the place arranges Center stake at manhole.

(2) active well construction

The steel bar concrete precast plate is installed in active well reservation notch suitable for reading, is wanted the seat slurry full in the notch.The wall of laying bricks at precast plate reserved opening place, all bricks are wanted saturated with water, and Ying Manpu, full squeezing are taken block up and down when building by laying bricks or stones, and thickness of mortarat bed joint and perpends width should be even, and vertical straight joint must not be arranged.When building manhole by laying bricks or stones, should install synchronously and mark time, want accurately the position, and the installation back of marking time must not trampled before masonry mortar reaches regulation compressive strength.Well inwall front cover should divide two-layer smearing into, strikes off and make the surface to cause coarse line after first road is smeared into; After the second road mortar dries, compacting troweling at twice.Slurry and the interlayer of the basic unit close and firm that should bond must not have phenomenons such as hollowing and crackle.The planeness of wiping one's face should be greater than 15mm.After plastering mortar solidifies, should keep moist curing, curing time is no less than 14d.

(3) parados is installed behind the assembling

The parados back soil body must be evenly closely knit behind the assembling, and wall should be smooth, and vertical with pipeline jacking direction; Back soil body wall should be close to the back parados, should adopt the filling of sandstone material closely knit when hole is arranged.The bottom of parados following 500mm at the bottom of working pit behind the assembling, thus make back jack center of effort highly be not less than 1/3 of back lumps of wood height, the point of making a concerted effort of being broken ground behind origin of force and the wall is consistent.

(4) guide rail is installed

When guide rail is installed and active well base plate pre-embedded steel slab weld, and support with shaped steel and to enclose the jail.To check the pipeline center position earlier before guide rail is installed, guarantee that the elevation of guide rail, axial location are accurate.The rail axis position deviation is no more than 3mm, and the elevation of top surface deviation is no more than 3mm, is no more than 2mm apart from deviation in two rails.The guide rail end can not be too far away apart from the work wall, should control about 500mm, and reserving seam when guide rail is installed highly is 120mm.Whenever advance pipe joint and should proofread guide rail elevation, center line and level, and along with guided way is in time proofreaied and correct in the variation of pipeline jacking load.

(5) main top jack installation

Jack will be that axial symmetry is arranged with the pipe centerline.Main top oil cylinder frame is installed and is wanted accurate positioning, guarantees the correct position of cylinder force point, and its elevation and plane alignment error should be controlled in 3mm.The oil cylinder errors of centration that is installed on the oil cylinder frame is controlled in 3mm.Jack is fixed on the support, and its central point of making a concerted effort is on pipe centerline; The oil circuit of jack should be in parallel, and every jack should have oil-feed, move back oily control system.The position of jack is positioned at 7/24 place of pipeline perpendicular diameter, makes jack make a concerted effort the position of position and jacking drag on same axis, avoids producing the top couple, makes pipeline generation vertical error.

(6) oil pump is installed

Oil pump is arranged near the jack, and oil pipe is straight, corner is few; Oil pump should be complementary with jack, and emergency bearing oil pump is arranged; Oil pump installs, and carries out test running.Slowly carry out when jacking begins, treat each contact site driving fit after, again by normal move speed jacking; If find that oil pressure increases suddenly, stop jacking immediately in the jacking, check reason and continue jacking after treatment; When jack piston was return, oil pressure was not too much, and speed must not be too fast.

(7) top iron is installed

Top iron adopts the cast-steel integral casting or adopts the shaped steel welding fabrication.The vertical top of single file iron center line is consistent with conduit axis; Two center lines of the vertical top of duplicate rows iron are parallel, and equate with the tubular axis linear distance, and will be perpendicular to the pipe end plane.The adjacent surface of top iron is orthogonal, on the iron of top locking device is arranged, and top iron should be able to keep stable when placing.When vertically top iron contacts with the pipe end face, must make vertical top iron origin of force height and position be positioned at external diameter 7/24 place.When top power was big, the pipe end face should add arched top iron steel plate.When changing top iron, use the big top iron of length earlier, should lock after the iron assembly unit of top.Should adopt the padded coaming liner between top iron and the mouth of pipe, when top power during near the permission compressive strength of tube coupling material, pipe end should increase circular top iron.During jacking, the staff must not be above the iron of top and the side stop, and observe top iron at any time no abnormal sign arranged.

(8) construction of turnover hole and sealing

Equipment installs the back a complete set of jacking equipment of reply and does the primary system debugging, after definite jacking equipment operation is all right, and beginning jacking work.When growing apart from jacking, make sealing ring so that the thixotropic slurry performance drag-reduction effect that pours at the portal place.

(9) pipeline jacking

After dismounting is sealed up a door, should begin the jacking head immediately, after the jacking 300mm, unlatching adds the mud system and injects mud, in order to regulate the creeping of dregs and keep earth pressure balance.When head just buries, because head does not have enough resisting moment in orbit, head easily produced rotation when cutterhead was rotated, so when the initial 2m that buries, move speed control is below 5mm/min, and observation airplane head inclination angle and the anglec of rotation incessantly, and the inclination angle changes with the levelling of correction jack, the anglec of rotation is greater than ± 50, and cutterhead is opened the counter-rotating levelling; Under the non-rotary situation of head behind the jacking 2m, strengthen move speed gradually.When head did not bury as yet fully, native storehouse pressure was controlled to be 0.1MPa.After head all buried, first pipe joint was done rear enclosed down.After rear enclosed is intact, annotate the space of cement mortar filling head outside backbreaking at 1: 2 to the head shell injected hole, grouting pressure is controlled to be 0.4MPa.Locate built-in rigidity piston ring at the hole.Rear enclosed adopts the ring-shaped rubber plate to be close to the soil body, and the hole side wall covers pressure with doughnut-shaped steel plate.Control native storehouse pressure according to predefined parameter during jacking, meet sand gravel layer, when nearer apart from building, soil pressure is set suitably and is strengthened.Be provided with the thixotropic slurry injected hole at the head afterbody, every joint concrete reinforced pipe is established injected hole, slip casting at any time during jacking.Move speed control is used low speed at 40mm/min when preceding 30m and correction, and looking afterwards is unearthed stirs, the cutterhead torque condition is suitably accelerated move speed.Under when managing, stop under the jacking state at head, cutterhead idle running 3~5min closes conveying worm spoil disposal hydraulic pressure door when shutting down, and outage is to guarantee soil pressure storehouse soil pressure.

If center, elevation deviation then will stop jacking immediately greater than ± 20mm, correction is proofreaied and correct and should slowly be carried out, and tube coupling is resetted gradually, must not entangle vigour suddenly.When wherein rectifying a deviation elevation, the pipe on the track will add counterweight; During the correction center, the pipe on the track will add supported on both sides.After head is all gone into the hole, and elevation, centre deviation will in time adopt the head correcting device to rectify a deviation during greater than 10mm, and the center is controlled in 5mm, and high process control is in ± 10mm, and tool heads self straightening method is adopted in bearing calibration.The effective control tool head of this method for correcting error is the state of four direction up and down, and the amplitude of at every turn rectifying a deviation is a unit with 5mm, measures off normal according to the inclinometer of tool heads and laser transit and judges, if when trend does not reduce, increases the correction dynamics; If when trend is stablized or reduced, should keep this correction dynamics, continue jacking; When off normal trend is opposite, then need the correction dynamics is reduced gradually.In the pipeline jack-in process, if move speed is on the low side in the powder fine sand soil layer, turn down the into concentration of hydraulic mixture of mud, reduce move speed.When running into the different soil layer of soft or hard degree, judge geological conditions by the torque of cutterhead.If hardening suddenly then should add water or mud in native storehouse.

(10) be unearthed

The soil that excavates in the push-bench course of work is transported on the belt conveyer through conveying worm earlier, is transported in the battery truck through belt conveyer again, and battery truck is transported to active well, and Tu Chang is deposited on last vertical handling to ground, outward transport regularly.

Claims (1)

1. gutter jacking construction method is characterized in that construction sequence comprises:
(1) measures unwrapping wire
Lay temporary bench mark and conduit axis control stake, during the construction line-putting, establish Center stake every 20m, the place arranges Center stake at manhole;
(2) active well construction
The steel bar concrete precast plate is installed in active well reservation notch suitable for reading, is wanted the seat slurry full in the notch; The wall of laying bricks at precast plate reserved opening place, all bricks are wanted saturated with water, and Ying Manpu, full squeezing are taken block up and down when building by laying bricks or stones, and thickness of mortarat bed joint and perpends width should be even, and vertical straight joint must not be arranged; When building manhole by laying bricks or stones, should install synchronously and mark time, want accurately the position, and the installation back of marking time must not trampled before masonry mortar reaches regulation compressive strength; Well inwall front cover should divide two-layer smearing into, strikes off and make the surface to cause coarse line after first road is smeared into; After the second road mortar dries, compacting troweling at twice; Slurry and the interlayer of the basic unit close and firm that should bond must not have phenomenons such as hollowing and crackle; The planeness of wiping one's face should be greater than 15mm; After plastering mortar solidifies, should keep moist curing, curing time is no less than 14d;
(3) parados is installed behind the assembling
The parados back soil body must be evenly closely knit behind the assembling, and wall should be smooth, and vertical with pipeline jacking direction; Back soil body wall should be close to the back parados, should adopt the filling of sandstone material closely knit when hole is arranged; The bottom of parados following 500mm at the bottom of working pit behind the assembling, thus make back jack center of effort highly be not less than 1/3 of back lumps of wood height, the point of making a concerted effort of being broken ground behind origin of force and the wall is consistent; Parados verticality allowable variation is parados height behind 0.1% assembling behind the assembling, and horizontal torsion degree allowable variation is parados length behind 0.1% assembling;
(4) guide rail is installed
When guide rail is installed and active well base plate pre-embedded steel slab weld, and support with shaped steel and to enclose the jail; To check the pipeline center position earlier before guide rail is installed, guarantee that the elevation of guide rail, axial location are accurate; The rail axis position deviation is no more than 3mm, and the elevation of top surface deviation is no more than 3mm, is no more than 2mm apart from deviation in two rails; The guide rail end can not be too far away apart from the work wall, should control about 500mm, and reserving seam when guide rail is installed highly is 100~150mm; Whenever advance pipe joint and should proofread guide rail elevation, center line and level, and along with the timely corrective rail of variation of pipeline jacking load;
(5) main top jack installation
Jack will be that axial symmetry is arranged with the pipe centerline; Main top oil cylinder frame is installed and is wanted accurate positioning, guarantees the correct position of cylinder force point, and its elevation and plane alignment error should be controlled in 3mm; The oil cylinder errors of centration that is installed on the oil cylinder frame is controlled in 3mm; Jack is fixed on the support, and its central point of making a concerted effort is on pipe centerline; The oil circuit of jack should be in parallel, and every jack should have oil-feed, move back oily control system; The position of jack is positioned at 1/3~1/4 place of pipeline perpendicular diameter, makes jack make a concerted effort the position of position and jacking drag on same axis, avoids producing the top couple, makes pipeline generation vertical error;
(6) oil pump is installed
Oil pump is arranged near the jack, and oil pipe is straight, corner is few; Oil pump should be complementary with jack, and emergency bearing oil pump is arranged; Oil pump installs, and carries out test running; Slowly carry out when jacking begins, treat each contact site driving fit after, again by normal move speed jacking; If find that oil pressure increases suddenly, stop jacking immediately in the jacking, check reason and continue jacking after treatment; When jack piston was return, oil pressure was not too much, and speed must not be too fast;
(7) top iron is installed
Top iron adopts the cast-steel integral casting or adopts the shaped steel welding fabrication; The vertical top of single file iron center line is consistent with conduit axis; Two center lines of the vertical top of duplicate rows iron are parallel, and equate with the tubular axis linear distance, and will be perpendicular to the pipe end plane; The adjacent surface of top iron is orthogonal, on the iron of top locking device is arranged, and top iron should be able to keep stable when placing; When vertically top iron contacts with the pipe end face, must make vertical top iron origin of force height and position be positioned at external diameter 1/3~1/4 place; When top power was big, the pipe end face should add arched top iron steel plate; When changing top iron, use the big top iron of length earlier, should lock after the iron assembly unit of top; Should adopt the padded coaming liner between top iron and the mouth of pipe, when top power during near the permission compressive strength of tube coupling material, pipe end should increase circular top iron; During jacking, the staff must not be above the iron of top and the side stop, and observe top iron at any time no abnormal sign arranged;
(8) construction of turnover hole and sealing
Equipment installs the back a complete set of jacking equipment of reply and does the primary system debugging, after definite jacking equipment operation is all right, and beginning jacking work; When growing apart from jacking, make sealing ring so that the thixotropic slurry performance drag-reduction effect that pours at the portal place;
(9) pipeline jacking
After dismounting is sealed up a door, should begin the jacking head immediately, after the jacking 300mm, unlatching adds the mud system and injects mud, in order to regulate the creeping of dregs and keep earth pressure balance; When head just buries, because head does not have enough resisting moment in orbit, head easily produced rotation when cutterhead was rotated, so when the initial 2m that buries, move speed control is below 5mm/min, and observation airplane head inclination angle and the anglec of rotation incessantly, and the inclination angle changes with the levelling of correction jack, the anglec of rotation is greater than ± 50 degree, and cutterhead is opened the counter-rotating levelling; Under the non-rotary situation of head behind the jacking 2m, strengthen move speed gradually; When head did not bury as yet fully, native storehouse pressure was controlled at 0.1~0.15MPa; After head all buried, first pipe joint was done rear enclosed down; After rear enclosed is intact, the space of outside the head shell injected hole is annotated 1:2 cement mortar filling head, backbreaking, grouting pressure is controlled at 0.4MPa; Locate built-in rigidity piston ring at the hole; Rear enclosed adopts the ring-shaped rubber plate to be close to the soil body, and the hole side wall covers pressure with doughnut-shaped steel plate; Control native storehouse pressure according to predefined parameter during jacking, meet sand gravel layer, when nearer apart from building, soil pressure is set suitably and is strengthened; Be provided with the thixotropic slurry injected hole at the head afterbody, every joint concrete reinforced pipe is established injected hole, slip casting at any time during jacking; Move speed control is used low speed at 30~50mm/min when preceding 30m and correction, and looking afterwards is unearthed stirs, the cutterhead torque condition is suitably accelerated move speed; Under when managing, stop under the jacking state at head, cutterhead idle running 3~5min closes conveying worm spoil disposal hydraulic pressure door when shutting down, and outage is to guarantee soil pressure storehouse soil pressure;
If center, elevation deviation then will stop jacking immediately greater than ± 20mm, correction is proofreaied and correct and should slowly be carried out, and tube coupling is resetted gradually, must not entangle vigour suddenly; When wherein rectifying a deviation elevation, the pipe on the track will add counterweight; During the correction center, the pipe on the track will add supported on both sides; After head is all gone into the hole, and elevation, centre deviation will in time adopt the head correcting device to rectify a deviation during greater than 10mm, and the center is controlled in 5mm, and high process control is in ± 10mm, and tool heads self straightening method is adopted in bearing calibration; The effective control tool head of this method for correcting error is the state of four direction up and down, and the amplitude of at every turn rectifying a deviation is a unit with 5mm, measures off normal according to the inclinometer of tool heads and laser transit and judges, if when trend does not reduce, increases the correction dynamics; If when trend is stablized or reduced, should keep this correction dynamics, continue jacking; When off normal trend is opposite, then need the correction dynamics is reduced gradually; In the pipeline jack-in process, if move speed is on the low side in the powder fine sand soil layer, turn down the into concentration of hydraulic mixture of mud, reduce move speed; When running into the different soil layer of soft or hard degree, judge geological conditions by the torque of cutterhead; If hardening suddenly then should add water or mud in native storehouse;
(10) be unearthed
The soil that excavates in the push-bench course of work is transported on the belt conveyer through conveying worm earlier, is transported in the battery truck through belt conveyer again, and battery truck is transported to active well, and Tu Chang is deposited on last vertical handling to ground, outward transport regularly.
CN 201110119467 2011-04-28 2011-04-28 Drain pipe jacking construction method CN102277898B (en)

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CN 201210575941 Division CN103046638A (en) 2011-04-28 2011-04-28 Pipe jacking construction method
CN 201210575945 Division CN103015519A (en) 2011-04-28 2011-04-28 Pipe-jacking construction of drain pipe

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CN102277898A CN102277898A (en) 2011-12-14
CN102277898B true CN102277898B (en) 2013-08-07

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