CN110645410A - Auxiliary forming device for anti-drag slurry sleeve in pipe jacking construction of sand layer - Google Patents
Auxiliary forming device for anti-drag slurry sleeve in pipe jacking construction of sand layer Download PDFInfo
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- CN110645410A CN110645410A CN201910827213.4A CN201910827213A CN110645410A CN 110645410 A CN110645410 A CN 110645410A CN 201910827213 A CN201910827213 A CN 201910827213A CN 110645410 A CN110645410 A CN 110645410A
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- lantern ring
- jacking
- grouting
- sleeve
- sleeve ring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/06—Accessories therefor, e.g. anchors
Abstract
The invention relates to an auxiliary forming device for a resistance-reducing slurry sleeve in sand layer pipe jacking construction, which comprises a lower sleeve ring and an upper sleeve ring, wherein the lower sleeve ring is of a funnel structure, the upper sleeve ring is of a tubular structure, the lower sleeve ring and the upper sleeve ring are combined into a finished resistance-reducing slurry sleeve forming cover body, the lower sleeve ring and the upper sleeve ring are sleeved on the outer side of a jacking pipeline, the bottom of the lower sleeve ring is welded on the top edge of a tool head, the tool head is fixedly connected with the jacking pipeline, a plurality of resistance-reducing slurry grouting holes are formed in the bottom of the jacking pipeline in the circumferential direction, the resistance-reducing slurry grouting holes are communicated with the interior of the lower sleeve ring, a lower auxiliary grouting device is arranged at the bottom of the lower sleeve ring, and a plurality of upper. The grouting hole is not directly contacted with the soil body, the resistance-reducing slurry just extruded from the grouting hole is not directly contacted with the soil body, and the complete slurry sleeve is formed and then directly contacted with the soil body in the process of forward jacking of the jacking pipe, so that the jacking resistance is effectively reduced, the engineering construction efficiency is accelerated, and the engineering cost is saved.
Description
Technical Field
The invention relates to a forming device for building construction, in particular to an auxiliary forming device for a drag reduction mud sleeve for pipe jacking construction in a sand layer.
Background
In the construction of pipe jacking, grouting drag reduction is a very important link, which is the key to the success of pipe jacking. In the process of pipe-jacking construction, if the injected drag reduction mud can form a complete drag reduction mud sleeve on the periphery of the pipeline, the drag reduction effect and the supporting effect of the drag reduction mud sleeve are quite satisfactory. The method has the advantages that a good anti-drag slurry sleeve is formed, the single-stage jacking length can be increased, the using amount of the interruption intervals is reduced, and the distance between the working well and the receiving well is increased, so that the number of the working wells and the receiving well is reduced, the engineering cost is reduced, and the like. When the jacking pipe is jacked in sandy soil, because the soil layer is extremely unstable, if other auxiliary measures are not taken, after the tool head is pushed forwards, the sandy soil body can immediately collapse on the outer wall of the pipeline to fill a gap caused by the difference between the outer diameter of the tool head and the outer diameter of the jacking pipe (the outer diameter of the general tool head is about 1-1.5 cm larger than the outer diameter of the pipeline), and then the jacking pipe can tightly hold the pipe wall to increase frictional resistance and block the normal jacking of the jacking pipe. Therefore, the supporting function and the resistance reducing function of the resistance reducing mud are particularly significant for jacking the jacking pipe in sandy soil. If the resistance-reducing slurry can not form a good slurry sleeve, the support is insufficient, soil body can collapse on the outer wall of the pipe to change sliding friction into dry friction, and the frictional resistance of the whole pipe section can greatly rise. Therefore, the jacking pipe can not form a good anti-drag slurry sleeve in sandy soil, and the method plays a decisive role in the success or failure of the engineering.
The existing pipe-jacking construction grouting system considers the preparation of anti-drag slurry, the number and the positions of grouting holes, the slurry extruded from the grouting holes directly contacts with the soil body, and an additional auxiliary device is not considered when the grouting holes are pressed to the outside of a pipeline to form a good slurry sleeve and then contact with the soil body. When the existing pipe jacking slurry grouting system is jacked in non-sandy soil, because the self arching effect of a soil body is stronger, when a tool head is pushed forwards, a gap between a pipeline and the soil body can be formed temporarily, the soil body cannot be filled immediately, and a complete slurry sleeve can be formed by timely grouting. However, in sandy soil, when the tool head is pushed forwards, if no additional device is used for temporarily isolating the pipeline and the soil body, the sandy soil body is extremely unstable, a gap between the pipeline and the soil body can be immediately filled with the sandy soil, the defects of the existing pipe-jacking slurry grouting system are shown, and the improvement design or the development of the existing pipe-jacking slurry grouting system is required.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides an auxiliary forming device for a drag reduction mud sleeve for sand layer pipe jacking construction.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a supplementary forming device of sand bed push pipe construction drag reduction mud cover, including the lower lantern ring and go up the lantern ring, the lantern ring is the funnel structure down, it is the tubular structure to go up the lantern ring, and the lantern ring makes up into the drag reduction mud cover shaping cover body of a completion with last lantern ring down, the lantern ring is established in the outside of advancing the pipeline in the top with last lantern ring cover down, the bottom welding of the lower lantern ring is on the top edge of instrument head, instrument head and advancing pipeline fixed connection in the top, it is equipped with a plurality of drag reduction mud grouting holes to advance pipeline bottom circumference, drag reduction mud grouting hole communicates each other with the inside of lower lantern ring, the bottom of the lower lantern ring is equipped with down supplementary grouting device, it is equipped with a plurality of supplementary grouting device on.
Further, supplementary slip casting device includes the lower equal cloth groove of loop configuration down, and the cross-section in lower equal cloth groove is the circular arc structure, and lower equal cloth groove with lantern ring structure as an organic whole down, be equipped with a plurality of grout holes down along its circumference in the equal cloth inslot down, the grout holes of making a bet is linked together with lower lantern ring inside.
Further, go up supplementary slip casting device and include the last equipartition groove of loop configuration, go up the cross-section of equipartition groove and be circular arc structure, and go up the equipartition groove with go up lantern ring structure as an organic whole, go up the equipartition inslot and be equipped with a plurality of upper grouting holes along its circumference, upper grouting hole and the inside of going up the lantern ring are linked together.
Furthermore, the joint of the lower lantern ring and the upper lantern ring is an arc chamfer.
Further, the outer diameter of the upper lantern ring is 1-1.5 cm larger than the outer diameter of the tool head.
The invention has the beneficial effects that:
(1) the lower lantern ring of funnel structure and the last lantern ring of tubulose mechanism make up into the drag reduction mud cover shaping cover body of a completion, can apply the mud of one deck to the soil body surface in advance through the lower supplementary grouting device on the lower lantern ring and the last supplementary grouting device on the last lantern ring, reduce the friction between the drag reduction mud cover shaping cover body and the soil body, the lower grout hole of lower equipartition inslot and the last grout hole of last equipartition inslot all do not have the contact with the soil body, avoid the emergence in stifled hole.
(2) The lower sleeve ring of the funnel structure can isolate the anti-drag slurry grouting hole at the tail part of the tool head or the anti-drag slurry grouting hole on a pipeline close to the tail part of the tool head from the soil body, so that the grouting hole at the position is not directly contacted with the soil body, the anti-drag slurry just extruded from the grouting hole at the position is not directly contacted with the soil body, and the anti-drag slurry is directly contacted with the soil body after a complete slurry sleeve is formed in the process that the jacking pipe is pushed forwards; because the soil body and the pipeline are separated by the complete anti-drag slurry sleeve, the whole pipeline is jacked in the slurry sleeve and is changed from dry friction into sliding friction, the anti-drag effect is very obvious, the jacking resistance is small, the engineering construction efficiency is accelerated, and the engineering cost is saved.
(3) The outer diameter of the upper lantern ring is 1-1.5 cm larger than the outer diameter of the tool head, the outer diameter of the common tool head is 1-1.5 cm larger than the outer diameter of the jacking pipeline, the outer diameter of the upper lantern ring is 2-3 cm larger than the outer diameter of the pipeline, and according to engineering practice, if slurry is firstly used for filling the gap of 2-3 cm, a slurry sleeve of 1-1.5 cm can be formed after the upper lantern ring is pulled out forwards. In general, in pipe jacking construction, the slurry sleeve with the thickness of 1cm can be formed, and the slurry sleeve forming condition is considered to be very ideal.
Drawings
FIG. 1 is a schematic perspective view of an auxiliary molding device for a drag reduction mud jacket for sand layer pipe jacking construction according to the present invention;
FIG. 2 is a schematic cross-sectional structural view of the auxiliary forming device for the drag-reducing mud jacket for sand layer pipe-jacking construction of the invention;
in the figure: the anti-drag slurry grouting device comprises a tool head 1, a jacking pipeline 2, a lower lantern ring 3, a lower uniform distribution groove 31, a lower slurry injection hole 311, an upper lantern ring 4, an upper uniform distribution groove 41, an upper slurry injection hole 411 and an anti-drag slurry injection hole 5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-2, an auxiliary forming device for a drag-reducing mud sleeve for sand-layer pipe-jacking construction comprises a lower sleeve ring 3 and an upper sleeve ring 4, wherein the lower sleeve ring 3 is of a funnel structure, the upper sleeve ring 4 is of a tubular structure, the lower sleeve ring 3 and the upper sleeve ring 4 form a complete drag-reducing mud sleeve forming cover body, the lower sleeve ring 3 and the upper sleeve ring 4 are sleeved outside a jacking pipeline 2, the bottom of the lower sleeve ring 3 is welded on the top edge of a tool head 1, the tool head 1 is fixedly connected with the jacking pipeline 2, a plurality of drag-reducing mud injection holes 5 are circumferentially arranged at the bottom of the jacking pipeline 2, the drag-reducing mud injection holes 5 are communicated with the inside of the lower sleeve ring 3, the lower sleeve ring 3 of the funnel structure can isolate the drag-reducing mud injection hole at the tail part of the tool head 1 or the mud drag-reducing mud injection hole 5 on the pipeline close to the tail part of the tool head from a soil body, so that the drag-reducing mud extruded from the injection holes, after forming a complete mud sleeve, the mud sleeve is directly contacted with the soil body.
The joint of the lower lantern ring 3 and the upper lantern ring 4 is subjected to circular arc chamfering treatment, the outer diameter of the upper lantern ring 4 is 1-1.5 cm larger than the outer diameter of the tool head 1, and at the moment, when the lantern ring is jacked along with the tool head 1, the resistance generated by the lantern ring is small, so that the jacking resistance of the jacking pipe cannot be additionally increased due to the addition of the shaping cover body of the jacking pipe drag reduction mud sleeve.
The bottom of the lower lantern ring 3 is provided with a lower auxiliary grouting device, the upper lantern ring 4 is provided with a plurality of upper auxiliary grouting devices along the length of the upper lantern ring, and the surface of a soil body can be coated with slurry of a layer in advance through the lower auxiliary grouting devices on the lower lantern ring 3 and the upper auxiliary grouting devices on the upper lantern ring 4, so that the friction between the resistance-reducing slurry sleeve forming cover body and the soil body is reduced.
The lower auxiliary grouting device comprises a lower uniform distribution groove 31 with an annular structure, the section of the lower uniform distribution groove 31 is of an arc structure, the lower uniform distribution groove 31 and the lower collar 3 are of an integral structure, a plurality of lower grouting holes 311 are formed in the lower uniform distribution groove 31 along the circumferential direction of the lower uniform distribution groove, and the lower grouting holes 311 are communicated with the inner part of the lower collar 3; the upper auxiliary grouting device comprises an upper uniform distribution groove 41 with an annular structure, the section of the upper uniform distribution groove 41 is of an arc structure, the upper uniform distribution groove 41 and the upper lantern ring 4 are of an integral structure, a plurality of upper grouting holes 411 are formed in the upper uniform distribution groove 41 along the circumferential direction of the upper uniform distribution groove, the upper grouting holes 411 are communicated with the inside of the upper lantern ring 4, and the lower grouting holes 311 in the lower uniform distribution groove 31 and the upper grouting holes 411 in the upper uniform distribution groove 41 are not in contact with soil, so that hole blockage is avoided.
Implementation example:
the project uses the phi 1800 steel jacking pipeline 2 for construction, mainly tunnels in 3 layers of silt, has good permeability, relatively large frictional resistance of the jacking pipeline 2, and the frictional resistance reduction outside the jacking pipeline 2 is a key problem of the project. The outer diameter of the tool head 1 is 1.5cm larger than that of the jacking pipe, the outer diameters of openings of a lower lantern ring 3 and an upper lantern ring 4 which are welded on a shell at the tail part of the tool head 1 are 1cm larger than that of the tool head 1, and the length of a finished anti-drag slurry sleeve forming cover body along the jacking direction of the jacking pipeline 2 is 20 cm. Because the jacking pipeline 2 is constructed underground, the mud sleeve condition cannot be observed by naked eyes, and the resistance reduction effect and the mud sleeve forming condition are analyzed through the recorded jacking force data.
After the project is smoothly jacked, the average frictional resistance of the project jacking pipeline 2 during jacking is calculated according to the recorded jacking force data and is only 1/3-1/2 specified by the standard regulation after the drag reduction slurry is applied, the drag reduction effect is good, and the jacking pipeline 2 only uses the slurry for drag reduction and does not use other drag reduction measures, so that the forming condition of the slurry sleeve is considered to be very good. In addition, the jacking resistance of the jacking pipe is not additionally increased due to the addition of the drag reduction mud sleeve forming cover body.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The utility model provides a supplementary forming device of sand layer push pipe construction drag reduction mud cover, includes lower lantern ring (3) and last lantern ring (4), its characterized in that: the lower lantern ring (3) is the funnel structure, goes up the lantern ring (4) and is the tubular structure, and the lantern ring (3) and the last lantern ring (4) make up into the drag reduction mud cover shaping cover body of a completion down, the outside at jacking pipeline (2) is established with last lantern ring (4) cover down in lantern ring (3), the bottom welding of the lower lantern ring (3) is on the top edge of instrument head (1), instrument head (1) and jacking pipeline (2) fixed connection, be equipped with a plurality of drag reduction mud grouting holes (5) on jacking pipeline (2) bottom circumference, and drag reduction mud grouting hole (5) and the inside of the lower lantern ring (3) communicate each other, the bottom of the lower lantern ring (3) is equipped with down supplementary slip casting device, goes up the lantern ring (4) and is equipped with a plurality of supplementary slip casting devices on along its length.
2. The sand layer pipe jacking construction drag reduction mud sleeve auxiliary forming device of claim 1, characterized in that: the lower auxiliary grouting device comprises a lower uniform distribution groove (31) of an annular structure, the cross section of the lower uniform distribution groove (31) is of an arc structure, the lower uniform distribution groove (31) and the lower sleeve ring (3) are of an integral structure, a plurality of lower grouting holes (311) are formed in the lower uniform distribution groove (31) along the circumferential direction of the lower uniform distribution groove, and the lower grouting holes (311) are communicated with the inner part of the lower sleeve ring (3).
3. The sand layer pipe jacking construction drag reduction mud sleeve auxiliary forming device of claim 1, characterized in that: go up supplementary slip casting device and include that the last equipartition groove (41) of loop configuration goes up the cross-section of equipartition groove (41) and be the circular arc structure, and go up equipartition groove (41) with go up lantern ring (4) structure as an organic whole, go up equipartition groove (41) and be equipped with a plurality of upper grouting holes (411) along its circumference, upper grouting hole (411) and upper lantern ring (4) inside are linked together.
4. The auxiliary molding device for the drag-reducing slurry sleeve for the sand layer pipe-jacking construction according to claim 1, wherein the joint of the lower lantern ring (3) and the upper lantern ring (4) is an arc chamfer.
5. The sand layer pipe jacking construction drag reduction mud sleeve auxiliary forming device of claim 1, characterized in that: the outer diameter of the upper lantern ring (4) is 1-1.5 cm larger than the outer diameter of the tool head (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910827213.4A CN110645410A (en) | 2019-09-03 | 2019-09-03 | Auxiliary forming device for anti-drag slurry sleeve in pipe jacking construction of sand layer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910827213.4A CN110645410A (en) | 2019-09-03 | 2019-09-03 | Auxiliary forming device for anti-drag slurry sleeve in pipe jacking construction of sand layer |
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| CN110645410A true CN110645410A (en) | 2020-01-03 |
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| CN201910827213.4A Pending CN110645410A (en) | 2019-09-03 | 2019-09-03 | Auxiliary forming device for anti-drag slurry sleeve in pipe jacking construction of sand layer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577975A (en) * | 2020-05-25 | 2020-08-25 | 四川石油天然气建设工程有限责任公司 | Tamping equipment for reducing resistance of pipe wall of tamping pipe and tamping construction process thereof |
| CN111705828A (en) * | 2020-07-02 | 2020-09-25 | 中铁工程装备集团有限公司 | Supporting structure and deviation-correcting supporting method for blade leg pipe joint |
| CN112695748A (en) * | 2020-12-03 | 2021-04-23 | 北京东地岩土工程有限公司 | Post-grouting construction method for pile end and post-grouting device used by post-grouting construction method |
| CN114109428A (en) * | 2021-11-10 | 2022-03-01 | 中国市政工程西南设计研究总院有限公司 | Pebble layer pipe jacking structure and pebble layer pipe jacking construction method |
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| CN102636430A (en) * | 2012-05-04 | 2012-08-15 | 上海交通大学 | Indoor simulation experiment system for pipe-jacking grouting drag reduction |
| CN103133766A (en) * | 2011-11-29 | 2013-06-05 | 上海市基础工程有限公司 | Over-length heavy caliber steel jacking pipe mud resistance reducing system |
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| CN1391053A (en) * | 2002-07-25 | 2003-01-15 | 上海隧道工程股份有限公司 | Earth pressure balancing technology for laying rectangular top pipe |
| CN1773151A (en) * | 2005-11-17 | 2006-05-17 | 上海交通大学 | Method for reducing prop force with ring-shape mud sheath in pipe-jacking construction |
| CN102537516A (en) * | 2010-12-13 | 2012-07-04 | 上海市基础工程有限公司 | Sandy soil pipe jacking anti-drag mud sleeve forming device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111577975A (en) * | 2020-05-25 | 2020-08-25 | 四川石油天然气建设工程有限责任公司 | Tamping equipment for reducing resistance of pipe wall of tamping pipe and tamping construction process thereof |
| CN111577975B (en) * | 2020-05-25 | 2021-12-03 | 四川石油天然气建设工程有限责任公司 | Tamping equipment for reducing resistance of pipe wall of tamping pipe and tamping construction process thereof |
| CN111705828A (en) * | 2020-07-02 | 2020-09-25 | 中铁工程装备集团有限公司 | Supporting structure and deviation-correcting supporting method for blade leg pipe joint |
| CN112695748A (en) * | 2020-12-03 | 2021-04-23 | 北京东地岩土工程有限公司 | Post-grouting construction method for pile end and post-grouting device used by post-grouting construction method |
| CN114109428A (en) * | 2021-11-10 | 2022-03-01 | 中国市政工程西南设计研究总院有限公司 | Pebble layer pipe jacking structure and pebble layer pipe jacking construction method |
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