CN110629757A - Method for removing pile section steel in SMW construction method - Google Patents
Method for removing pile section steel in SMW construction method Download PDFInfo
- Publication number
- CN110629757A CN110629757A CN201910956304.8A CN201910956304A CN110629757A CN 110629757 A CN110629757 A CN 110629757A CN 201910956304 A CN201910956304 A CN 201910956304A CN 110629757 A CN110629757 A CN 110629757A
- Authority
- CN
- China
- Prior art keywords
- shaped steel
- grouting
- steel
- pvc sleeve
- smw
- Prior art date
- 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
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A pile section steel removing method based on an SMW method is characterized in that a layer of PVC sleeve pipe with the same shape as the outer surface of an I-shaped steel is wrapped in the length direction of the outer surface of the I-shaped steel used for stirring construction; after the stirring construction is finished, the crane is in place, the hook is connected with the I-shaped steel hoisting hole to pull out the I-shaped steel, and grouting is started through the reserved grouting pipe, so that synchronization of pulling out the I-shaped steel and grouting is realized. The method adopts the PVC sleeve with the same shape as the I-shaped steel to wrap the I-shaped steel and insert the I-shaped steel into the mixing pile together, so that the instability of the pulling resistance of the I-shaped steel is avoided; due to the adoption of the synchronization of the pulling-out and grouting of the I-shaped steel; the pressure of the grouting on the bottom surface of the PVC sleeve and the upward tension of the crane on the I-shaped steel overcome the frictional resistance between the PVC sleeve and the I-shaped steel, and the I-shaped steel can be smoothly pulled up; and because the existence of PVC sleeve, can stabilize the cross-section in space after shaped steel is pulled out. The invention is suitable for other section steel of the SMW construction method pile.
Description
Technical Field
The invention relates to a method for removing pile section steel in an SMW construction method, and belongs to the technical field of foundation pit engineering.
Background
The SMW construction method is characterized in that a special multi-shaft stirring is utilized to drill and cut a soil body in situ, cement slurry is injected into the soil body at the end part of a drill bit, after full stirring and mixing, overlapping construction is adopted among construction units, H-shaped steel or other sections are inserted into a stirring pile body before a cement-soil mixture is hardened, and a continuous, complete and seamless underground continuous wall body with certain strength and rigidity is formed and can be used as a soil retaining and water stopping structure of an underground excavation foundation pit.
Along with the rapid development of modern urbanization construction, ground resources are increasingly in short supply, the importance of underground space excavation is highlighted, and the development of the underground space is accompanied with the problems of various foundation pit supporting and construction methods. The SMW construction method has the characteristics of no disturbance of adjacent soil bodies, no generation of adjacent ground settlement, short construction period, reusability of profile steel and the like in construction, and is widely applied to foundation pit engineering. However, in practical engineering, some problems still exist, such as: (1) the generation of longitudinal blocking: due to friction or inclination and other reasons, the cement-soil mixing wall can crack and break partially in the process of pulling the section steel, the space after the section steel is pulled out is blocked, grouting filling is not facilitated, and continuous deformation of adjacent buildings in a long period after construction can be caused. (2) Time consumption is as follows: the demand of the hydraulic pile extractor is increased, the traditional split pile extractor is complex to operate and low in efficiency, and the time for extracting a 20-meter H-shaped steel is up to 40 minutes. (3) The section steel is difficult to pull out and slip casting synchronously: because the stirring wall has resistance factors such as cracks, blockage and the like, the grouting can be delayed, and the synchronization of the grouting speed and the profile steel pulling speed is difficult to ensure.
Publication No. CN103790160A discloses a 'method for removing and grouting section steel by an SMW method', which provides that a steel pipe is welded on a section steel web plate, the steel pipe is removed along with the section steel when the section steel is removed, and a grouting pipe is lowered along the steel pipe to perform grouting in a gap after the section steel is removed, so that the blocking problem can be effectively solved. Unfortunately, the method does not solve the problem that the steel drawing has low working efficiency and the problem that the stirring wall is cracked and damaged when the steel is drawn out is not solved fundamentally.
Disclosure of Invention
The invention mainly aims to solve the problems of cracking of a stirring wall and low section steel pulling efficiency caused by the pulling of the section steel of the SMW construction method in the prior art, and provides a section steel pulling method of the SMW construction method.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pile section steel removing method based on an SMW method is characterized in that a PVC sleeve pipe with an inner cavity of the same shape as the outer surface of an I-shaped steel is wrapped in the length direction of the outer surface of the I-shaped steel used for stirring construction; after the stirring construction is finished, the crane is in place, the hook is connected with the I-shaped steel hoisting hole to pull out the I-shaped steel, and grouting is started through the reserved grouting pipe, so that synchronization of pulling out the I-shaped steel and grouting is realized.
Four grouting pipes with the length equal to that of the web plate of the I-shaped steel are welded at four corners of the web plate of the I-shaped steel; four corners of one end of the I-shaped steel are respectively provided with a hoisting hole, the distances from the four hoisting holes to the center of the cross section of the I-shaped steel are equal, and the center of the cross section of the I-shaped steel is the intersection point of the diagonals of the four corners of the cross section of the I-shaped steel.
A gap is reserved between the inner cavity of the PVC sleeve and the shape of the I-shaped steel, and the PVC sleeve can be sleeved on the outer surface of the I-shaped steel and cannot fall off when the pile-shaped steel works in a construction method.
And uniformly coating an antifriction agent on the outer surface of the I-shaped steel and the inner surface of the PVC sleeve.
The lower end of the PVC sleeve is closed, the upper end of the PVC sleeve is open, and the length of the I-shaped steel is 20-30 cm higher than that of the PVC sleeve.
The I-shaped steel is formed by welding single-section members with standard lengths; the PVC sleeve is processed into the standard length of a single section of the I-shaped steel, and the complete PVC sleeve is spliced by an adhesive.
A method for removing pile section steel in an SMW construction method comprises the following steps:
(1) four grouting pipes are welded at four corners of the web plate of the I-shaped steel and are in close contact with the PVC sleeve;
(2) coating a layer of customized PVC sleeve on the surface of the I-shaped steel, wherein the shape of the inner cavity of the PVC sleeve is the same as that of the outer surface of the I-shaped steel welded with the grouting pipe;
(3) inserting the I-shaped steel coated with the PVC sleeve into the fully-stirred cement-soil mixing pile by using a crane to complete the construction of the pile in the SMW method;
(4) when the I-shaped steel is pulled out, the hook is connected with the I-shaped steel hoisting hole, the I-shaped steel is hoisted by a crane, and grouting is started through four reserved grouting pipes, so that synchronization of pulling out the I-shaped steel and grouting is realized; the pressure of the grouting on the bottom surface of the PVC sleeve and the upward pulling force of the crane on the I-shaped steel overcome the friction force between the PVC sleeve and the I-shaped steel, and the I-shaped steel is smoothly pulled up.
When the I-shaped steel is pulled out, the verticality of hoisting is checked, and the I-shaped steel lead is ensured to be pulled out vertically.
In order to avoid the influence on the strength of the underground stirring wall and peripheral buildings caused by the too high lifting speed of the hoisting I-shaped steel, the section steel is slowly lifted, grouting is started through the four grouting holes, and the lifting speed of the I-shaped steel is consistent with the grouting speed.
And finishing grouting after the I-shaped steel is completely pulled out. And putting the pulled I-shaped steel in place, and pulling the lower root I-shaped steel according to the steps.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the PVC sleeve with the same shape as the I-shaped steel is used for wrapping the I-shaped steel and inserting the I-shaped steel into the mixing pile together, so that the instability of the pulling resistance of the I-shaped steel is avoided; due to the adoption of the synchronization of the pulling-out and grouting of the I-shaped steel; the pressure of the grouting on the bottom surface of the PVC sleeve and the upward tension of the crane on the I-shaped steel overcome the frictional resistance between the PVC sleeve and the I-shaped steel, and the I-shaped steel can be pulled up smoothly.
The method adopts the crane to continuously pull out the profile steel without a hydraulic pile extractor, thereby reducing the engineering cost and improving the working efficiency. Secondly, in the traditional pile pulling process, due to the friction resistance between the section steel and the concrete, the stirring wall is broken to generate cracks, so that the settlement of the surrounding buildings is caused. The improved section steel pulling method avoids the stirring wall from being broken in the pile pulling process, and protects surrounding buildings. The traditional SMW method is low in efficiency when the section steel is pulled out, about 40 minutes is needed for pulling out a 20-meter I-shaped steel, and the invention can greatly improve the working efficiency by directly adopting a crane to pull out the section steel. Meanwhile, the profile steel is pulled out and grouted synchronously, so that the strength and stability of the cement-soil mixing wall are not influenced. In the prior art, when the I-shaped steel is pulled out, the grouting speed is difficult to be ensured to be the same as the speed for pulling out the section steel due to the cracks, the blocked cross sections and the like of the stirring wall.
The invention is suitable for removing the I-shaped steel and other shaped steel of the SMW construction method pile.
Drawings
FIG. 1 is a schematic view of a PVC sleeve of the present invention wrapping an I-section steel;
FIG. 2 is a schematic view of a cement mixing pile;
FIG. 3 is a schematic plan view of an I-shaped steel and a PVC sleeve inserted into a mixing pile;
4 (a) -4 (c) are schematic diagrams of I-shaped steel removal and synchronous grouting construction;
in the figure, 1 is an I-shaped steel, 2 is a PVC sleeve, 3 is a grouting pipe, and 4 is a cement soil mixing pile.
Detailed Description
The present embodiment will further explain the present invention in detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of a PVC sleeve wrapping an I-shaped steel. Wherein 1 is I-shaped steel; 2 is a PVC sleeve; and 3 is a grouting pipe. As shown in fig. 1, grouting pipes with the length equal to that of the web plate of the i-shaped steel are reserved at four corners of the web plate of the i-shaped steel; the surface of the I-shaped steel is sleeved with a PVC sleeve with the shape of an inner cavity identical to that of the outer surface of the I-shaped steel, the I-shaped steel in unit length is connected into a whole by welding, the PVC sleeve is connected and wraps the whole I-shaped steel and the grouting pipe by an adhesive, and the height of the I-shaped steel is 20-30 cm higher than that of the PVC pipe.
Fig. 2 is a schematic view of a soil cement mixing pile, wherein 4 is a soil cement mixing pile.
FIG. 3 is a schematic plan view of an I-shaped steel and a PVC sleeve inserted into a mixing pile, wherein 1 is the I-shaped steel; 2 is a PVC sleeve; 3 is a grouting pipe; and 4, cement soil mixing piles. The relative positions of the I-shaped steel, the PVC sleeve and the cement-soil mixing pile are shown in figure 3, the inner surface of the PVC sleeve and the outer surface of the I-shaped steel are uniformly coated with the antifriction agent, the I-shaped steel and the PVC sleeve are inserted into the cement-soil mixing pile by means of dead weight, and if the designed elevation cannot be achieved, the I-shaped steel and the PVC sleeve can be inserted into the designed elevation by means of a vibration hammer.
4 (a) -4 (c) are schematic diagrams of I-shaped steel removal and synchronous grouting construction; FIG. 4 (a) shows the crane in place and the section steel is prepared for hoisting, after the crane is in place, the hook is connected with the hoisting hole, and the verticality of the section steel is checked; FIG. 4 (b) shows a stage in which the crane lifts the I-shaped steel and simultaneously performs grouting, wherein the crane starts to lift the I-shaped steel, and simultaneously performs grouting from four grouting pipes on the I-shaped steel at a preset speed, so that the grouting speed is ensured to be consistent with the lifting speed of the I-shaped steel; and (c) in the stage that the crane completely removes the I-shaped steel, grouting of the mixing pile is completed, then placing the I-shaped steel at a specified position, and removing the lower root I-shaped steel according to the steps.
As shown in fig. 1, the method for removing the section steel of the SMW method in this embodiment includes the following steps:
(1) four grouting pipes are welded at four corners of the web plate of the I-shaped steel and are in close contact with the PVC sleeve;
(2) coating a layer of customized PVC sleeve on the surface of the I-shaped steel, wherein the shape of the inner cavity of the PVC sleeve is the same as that of the outer surface of the I-shaped steel welded with the grouting pipe;
(3) inserting the I-shaped steel coated with the PVC sleeve into the fully-stirred cement-soil mixing pile by using a crane to complete the construction of the pile in the SMW method;
(4) when the I-shaped steel is pulled out, the hook is connected with the section steel hoisting hole, the verticality of hoisting is checked, and the I-shaped steel lead is ensured to be pulled out vertically; hoisting the I-shaped steel by a crane, and simultaneously starting grouting through four reserved grouting pipes to realize the synchronization of I-shaped steel removal and grouting; the pressure of the grouting on the bottom surface of the PVC sleeve and the upward pulling force of the crane on the I-shaped steel overcome the friction force between the PVC sleeve and the I-shaped steel, and the I-shaped steel is smoothly pulled up.
In order to avoid the influence on the strength of the underground stirring wall and peripheral buildings caused by the too high lifting speed of the hoisting I-shaped steel, the section steel is slowly lifted, grouting is started through the four grouting holes, and the lifting speed of the I-shaped steel is consistent with the grouting speed.
Claims (10)
1. A pile section steel removing method based on an SMW method is characterized in that a layer of PVC sleeve pipe with the same shape as the outer surface of an I-shaped steel is wrapped in the length direction of the outer surface of the I-shaped steel used for stirring construction; after the stirring construction is finished, the crane is in place, the hook is connected with the I-shaped steel hoisting hole to pull out the I-shaped steel, and grouting is started through the reserved grouting pipe, so that synchronization of pulling out the I-shaped steel and grouting is realized.
2. The method for pulling out the pile section steel according to the SMW method, wherein four grouting pipes with the length equal to that of the web plate of the I-shaped steel are welded at four corners of the web plate of the I-shaped steel.
3. The method for pulling out the pile section steel in the SMW construction method according to claim 1, wherein a gap is reserved between an inner cavity of the PVC sleeve and the shape of the I-shaped steel, and the PVC sleeve can be sleeved on the outer surface of the I-shaped steel.
4. The method for pulling out the pile section steel in the SMW construction method according to claim 1, wherein an abrasion reducing agent is uniformly coated on the outer surface of the I-shaped steel and the inner surface of the PVC sleeve.
5. The method for pulling out the pile section steel in the SMW construction method according to claim 1, wherein the lower end of the PVC sleeve is closed, and the upper end of the PVC sleeve is open, and the length of the I-shaped steel is 20-30 cm higher than that of the PVC sleeve.
6. The method for removing the pile section steel according to the SMW construction method, wherein the I-shaped steel is formed by welding single-section members with standard length; the PVC sleeve is processed into the standard length of a single section of the I-shaped steel, and the complete PVC sleeve is spliced by an adhesive.
7. The method for removing the pile section steel in the SMW construction method according to claim 1, wherein the method for removing the I-shaped steel is as follows:
(1) four grouting pipes are welded at four corners of the web plate of the I-shaped steel and are in close contact with the PVC sleeve;
(2) coating a layer of customized PVC sleeve on the surface of the I-shaped steel, wherein the shape of the inner cavity of the PVC sleeve is the same as that of the outer surface of the I-shaped steel welded with the grouting pipe;
(3) inserting the I-shaped steel coated with the PVC sleeve into the fully-stirred cement-soil mixing pile by using a crane to complete the construction of the pile in the SMW method;
(4) when the I-shaped steel is pulled out, the hook is connected with the section steel hoisting hole, the I-shaped steel is hoisted by a crane, grouting is started through four grouting pipes on the I-shaped steel, and the I-shaped steel is pulled out and the grouting is kept synchronous; the pressure of the grouting on the bottom surface of the PVC sleeve and the upward pulling force of the crane on the I-shaped steel overcome the friction force between the PVC sleeve and the I-shaped steel, and the I-shaped steel is smoothly pulled up.
8. The method for removing the section steel of the SMW construction method according to claim 7, wherein the method is suitable for removing other section steel of the SMW construction method.
9. The method for pulling out the pile section steel by the SMW method according to claim 7, wherein when the I-shaped steel is pulled out, the verticality of hoisting is checked to ensure that the section steel is vertically pulled out.
10. The method for pulling out the pile section steel according to the SMW construction method, wherein when the I-shaped steel is pulled out, in order to avoid the problem that the strength of the underground stirring wall and surrounding buildings are affected due to the fact that the pulling speed of the hoisting I-shaped steel is too high, the section steel is pulled out slowly, grouting is started through four grouting holes, and the lifting speed of the I-shaped steel is consistent with the grouting speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956304.8A CN110629757A (en) | 2019-10-10 | 2019-10-10 | Method for removing pile section steel in SMW construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910956304.8A CN110629757A (en) | 2019-10-10 | 2019-10-10 | Method for removing pile section steel in SMW construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110629757A true CN110629757A (en) | 2019-12-31 |
Family
ID=68976020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910956304.8A Pending CN110629757A (en) | 2019-10-10 | 2019-10-10 | Method for removing pile section steel in SMW construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110629757A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115506334A (en) * | 2022-11-22 | 2022-12-23 | 海南省农垦金城实业有限公司 | Pile wall plugging structure of marine engineering gravel stratum SMW construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0976876A1 (en) * | 1998-07-27 | 2000-02-02 | Nippon Shokubai Co., Ltd. | Adhesion preventing method and support body extracting method |
| CN103790160A (en) * | 2014-01-17 | 2014-05-14 | 上海中锦建设集团股份有限公司 | Method for pulling out structural steel and conducting grouting through SMW construction method |
| CN106284327A (en) * | 2016-09-13 | 2017-01-04 | 上海隧道工程有限公司 | The construction method that formed steel construction in cement mixing method and micro-disturbance thereof are pulled out |
| CN107304561A (en) * | 2016-04-19 | 2017-10-31 | 郑州大学 | A kind of recoverable version steel Soil-cement wall construction |
| CN108301404A (en) * | 2018-01-18 | 2018-07-20 | 中国冶集团有限公司 | SMW engineering method pile-type steel is pulled out and high-pressure slip-casting method for synchronously constructing |
-
2019
- 2019-10-10 CN CN201910956304.8A patent/CN110629757A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0976876A1 (en) * | 1998-07-27 | 2000-02-02 | Nippon Shokubai Co., Ltd. | Adhesion preventing method and support body extracting method |
| CN103790160A (en) * | 2014-01-17 | 2014-05-14 | 上海中锦建设集团股份有限公司 | Method for pulling out structural steel and conducting grouting through SMW construction method |
| CN107304561A (en) * | 2016-04-19 | 2017-10-31 | 郑州大学 | A kind of recoverable version steel Soil-cement wall construction |
| CN106284327A (en) * | 2016-09-13 | 2017-01-04 | 上海隧道工程有限公司 | The construction method that formed steel construction in cement mixing method and micro-disturbance thereof are pulled out |
| CN108301404A (en) * | 2018-01-18 | 2018-07-20 | 中国冶集团有限公司 | SMW engineering method pile-type steel is pulled out and high-pressure slip-casting method for synchronously constructing |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115506334A (en) * | 2022-11-22 | 2022-12-23 | 海南省农垦金城实业有限公司 | Pile wall plugging structure of marine engineering gravel stratum SMW construction method |
| CN115506334B (en) * | 2022-11-22 | 2023-02-03 | 海南省农垦金城实业有限公司 | Pile wall plugging structure of marine engineering gravel stratum SMW construction method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105569560A (en) | Full casing long-spiral bored pile machine and method of using same for construction | |
| CN111254918A (en) | Steel trestle steel pipe pile anchoring method reinforced by pile bottom anchor rod | |
| CN109898521A (en) | A kind of anchored pile supporting and construction method for foundation pit external corner | |
| CN110206071B (en) | Method and device for reinforcing joints of underground continuous wall | |
| CN110777775A (en) | Foundation pit structure and construction method thereof | |
| CN112832233A (en) | Improved CFG pile construction method | |
| CN110629757A (en) | Method for removing pile section steel in SMW construction method | |
| CN106968252B (en) | Pile pulling recharging method and pile pulling recharging system | |
| CN114108694B (en) | Micro-disturbance anti-floating underground cylindrical structure and construction method thereof | |
| CN209837011U (en) | Bottom-expanding composite pipe pile structure for eliminating negative frictional resistance of soil filling stratum | |
| CN209339156U (en) | The embedding rock foot pilework of anchor tube formula in a kind of Extra-Deep Foundation Pit | |
| CN112647495A (en) | Construction method of prefabricated end-bearing tubular pile | |
| CN216640561U (en) | Novel combined type enclosure structure | |
| CN112252312B (en) | Construction method for enhancing integral stress performance of PHC pipe pile | |
| CN214784092U (en) | Foundation ditch relief well enclosed construction | |
| CN115233668A (en) | Post-grouting construction method for precast tubular pile by internally hammering pile tip into rock | |
| CN214169078U (en) | Prestressed advance inclined throwing support supporting structure system capable of being applied | |
| CN115075249A (en) | Pile foundation clearing device and pile foundation clearing process | |
| CN104727305B (en) | Boring high-pressure slip-casting uplift pile construction method | |
| CN108301404B (en) | Synchronous construction method for removing pile section steel and high-pressure grouting in SMW (soil mixing wall) method | |
| CN210086236U (en) | Bearing capacity lifting device of cast-in-place pile and cast-in-place pile | |
| CN113174947A (en) | Drilling and hammering integrated machine and pile planting process | |
| CN107023008B (en) | Pile pulling method and system for open caisson platform for retaining wall and counterforce | |
| CN110565692A (en) | construction method for steel bar and formwork of reverse construction method construction joint | |
| CN205277294U (en) | A complete set of tubular long spiral drilled stake machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20191231 |
|
| WD01 | Invention patent application deemed withdrawn after publication |