CN114319314A - Construction method for constructing large-thickness collapsible loess foundation by utilizing profile steel cement soil mixing wall - Google Patents
Construction method for constructing large-thickness collapsible loess foundation by utilizing profile steel cement soil mixing wall Download PDFInfo
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- CN114319314A CN114319314A CN202210078751.XA CN202210078751A CN114319314A CN 114319314 A CN114319314 A CN 114319314A CN 202210078751 A CN202210078751 A CN 202210078751A CN 114319314 A CN114319314 A CN 114319314A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 120
- 239000010959 steel Substances 0.000 title claims abstract description 120
- 239000004568 cement Substances 0.000 title claims abstract description 37
- 238000010276 construction Methods 0.000 title claims abstract description 31
- 239000002689 soil Substances 0.000 title claims abstract description 26
- 239000011440 grout Substances 0.000 claims description 11
- 239000002390 adhesive tape Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000009435 building construction Methods 0.000 abstract description 2
- 239000002352 surface water Substances 0.000 abstract description 2
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000007569 slipcasting Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of building construction, and particularly discloses a construction method for constructing a large-thickness collapsible loess foundation by utilizing a profile steel cement soil mixing wall. The steel comprises section steel, wherein the section steel is I-shaped steel; the section steel comprises a web plate, a first flange and a second flange which are integrally formed; a first pipe reserved part is arranged on one side of the web plate, and the first pipe reserved part is fixedly connected with the web plate and the first flange; and a second pipe reserved part is arranged on the other side of the web plate, and the second pipe reserved part is fixedly connected with the web plate and the second flange. The invention can solve the problem of incompact gap in the prior art, thereby effectively preventing surface water from penetrating into the underground structure part through removing the gap by the section steel, and reducing the treatment width of the foundation in the loess area.
Description
Technical Field
The invention belongs to the technical field of building construction, and particularly relates to a construction method for constructing a large-thickness collapsible loess foundation by utilizing a profile steel cement soil mixing wall.
Background
The construction process of the existing section steel cement soil mixing wall comprises the procedures of ditching and grooving, drilling of a three-shaft mixer, putting down I-shaped steel, pulling out the I-shaped steel, grouting a gap and the like. The specification of the H-shaped steel of the conventional section steel cement soil stirring wall is H700X 300X 13X 24 (20); h500, 300, 11, 18 and 15, the area of the theoretically formed gap after the removal is 141.2-159.2cm in the area of the H500 section steel2(ii) a The maximum clearance is less than 20mm, and the area of the H700 section steel after being pulled out is 207.5-231.5cm2The diameter of the corresponding minimum clearance circle is smaller than 25mm, cement slurry is filled in the grouting process by means of self weight after the I-shaped steel is pulled out, so that the compactness of the original gap after grouting is insufficient, the engineering quality is affected, and the waterproof effect of the curtain is further affected.
Therefore, the technical problem to be solved by the technical personnel in the field is to provide a novel construction device for the steel cement soil mixing wall.
Disclosure of Invention
The invention aims to overcome the defect of insufficient grouting compactness of a pulled gap of profile steel in the prior art and provides a construction method for constructing a large-thickness collapsible loess foundation by utilizing a profile steel cement soil mixing wall.
The invention provides a construction method for constructing a large-thickness collapsible loess foundation by utilizing a profile steel cement soil mixing wall, which is realized by profile steel cement soil mixing wall construction equipment, wherein the construction equipment comprises the following steps: the steel comprises section steel, wherein the section steel is I-shaped steel;
the section steel comprises a web plate, a first flange and a second flange which are integrally formed;
a first pipe reserved part is arranged on one side of the web plate, and the first pipe reserved part is fixedly connected with the web plate and the first flange;
and a second pipe reserved part is arranged on the other side of the web plate, and the second pipe reserved part is fixedly connected with the web plate and the second flange.
The further scheme is that the first pipe reserved part and the second pipe reserved part have the same structure.
The further scheme is that the first pipe reserved part is an angle steel which is fixedly connected with the first flange and the web plate respectively;
the angle steel bottom is provided with the shutoff steel sheet, the shutoff steel sheet is the rectangle steel sheet, the rectangle steel sheet with angle steel and shaped steel are full weld respectively and are connected.
The further scheme is that the first pipe reserved part is round steel which is fixedly connected with the section steel;
the round steel is of a cylindrical structure.
The construction equipment further comprises a splitting grouting pipe;
a plurality of grouting holes are formed in the pipe body part of the split grouting pipe;
and one ends of the grouting holes and the splitting grouting pipes are sealed by plastic adhesive tapes.
The further scheme is that the position of the initial grouting hole is 6 meters away from the top of the splitting grouting pipe, and the diameter of the grouting hole is gradually reduced from bottom to top.
The further proposal is that the plurality of grouting holes are arranged in a quincunx shape.
The construction method comprises the following steps:
s1, placing the section steel in a triaxial mixing pile of a groove, and filling cement soil in the groove;
s2, pulling out the section steel by using hoisting equipment, and forming a first pipe preformed hole and a second pipe preformed hole in the groove;
s3, inserting the steel pipe and the splitting grouting pipe into the first pipe preformed hole and the second pipe preformed hole respectively; filling pure cement slurry into the PVC pipe, and pulling out the PVC pipe while grouting; solidifying for 6-10 hours after grouting;
s4, performing layered grouting through a split grouting pipe; stopping grouting after the pressure is stabilized at 2.0MPa, and pulling out the split grouting pipe.
And S5, filling and compacting the gap formed by pulling out the section steel by grouting equipment.
In the step 3, the grouting pressure of the pure cement slurry filled through the PVC pipe is 0.6-1.0MPa, and the water-cement ratio is 1: 0.5, and the aperture of the PVC pipe is 25 mm.
In the step 4, the grouting pressure is 0.6-2.0MPa, the plastic adhesive tape at the bottom grout outlet of the split grouting pipe is firstly washed away by the grout, and then the plastic adhesive tapes of the grouting holes from bottom to top are sequentially washed away by the grout, so that layered grouting is realized.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention improves the mechanism of the section steel body, the first pipe reserved part and the second pipe reserved part are arranged on the section steel body, after the section steel is pulled out, the first pipe reserved hole and the second pipe reserved hole are formed in the groove, so that the two grouting pipes can be conveniently inserted into the gap, and by adopting the time-sharing grouting, the grout of the split grouting pipes can be split in the initial setting grout and spread along the crack, so that the filling compactness of the gap is improved.
(2) The split grouting pipe adopts a structural design that the grouting holes are gradually reduced from bottom to top, so that layered grouting can be realized during secondary high-pressure grouting, and surface water is effectively prevented from permeating into an underground structure through a section steel pull-out gap.
(3) The invention enhances the waterproof effect of the foundation, thereby reducing the treatment width of the foundation, further reducing the excavation area of foundation pit engineering, reducing the earth excavation amount, saving the construction period, having simple construction operation and great economic and social benefits.
Drawings
The invention is illustrated and described only by way of example and not by way of limitation in the scope of the invention as set forth in the following drawings, in which:
FIG. 1: structural schematic diagram of the section steel;
FIG. 2: FIG. 1 is an enlarged view of portion A;
FIG. 3: the structural schematic diagram of another embodiment of the section steel;
FIG. 4: enlarged part B of FIG. 3;
FIG. 5: the structural schematic diagram of the split grouting pipe;
FIG. 6: the structural schematic diagram of the downward section steel;
FIG. 7: a schematic drawing of the lowering position of the grouting pipe;
in the figure: 1-section steel, 11-web plate, 12-first flange, 13-second flange, 2-angle steel, 3-plugging steel plate, 4-round steel, 5-splitting grouting pipe, 6-grouting hole, 7-triaxial mixing pile, 8-first pipe preformed hole and 9-second pipe preformed hole.
Detailed Description
In order to make the objects, technical solutions, design methods, and advantages of the present invention more apparent, the present invention will be further described in detail by specific embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in figures 1 and 2, the invention provides a construction method for constructing a large-thickness collapsible loess foundation by using a section steel cement soil mixing wall, which is realized by the following equipment: the steel comprises section steel 1, wherein the section steel 1 is I-shaped steel; the section steel 1 comprises a web 11, a first flange 12 and a second flange 13 which are integrally formed;
the two sides of the web plate 11 are both provided with angle steel 2, and the angle steel 2 is fixedly connected with the first flange 12 and the web plate 11 or fixedly connected with the second flange 13 and the web plate 11; the bottom of the angle steel 2 is provided with a plugging steel plate 3, the plugging steel plate 3 is a rectangular steel plate, and the rectangular steel plate is in full-weld connection with the angle steel 2 and the section steel respectively.
As shown in fig. 5, the construction equipment further includes a split grouting pipe 5; a plurality of grouting holes 6 are formed in the pipe body part of the split grouting pipe 5; and the grouting holes 6 and one end of the splitting grouting pipe 5 are sealed by plastic adhesive tapes. The position of the initial grouting hole 6 is 6 meters away from the top of the splitting grouting pipe 5, the aperture of the grouting hole 6 is gradually reduced from bottom to top, and the plurality of grouting holes 6 are arranged in a quincunx manner.
In the above, the section steel can be H488 x 300 x 11 x 18 section steel or H700 x 300 x 13 x 24 section steel, the angle steel selects 25 x 16 x 4 angle steel, the plugging steel plate selects 30 x 20 x 5 steel plate, the aperture of the grouting holes is gradually reduced from bottom to top, the aperture of the grouting hole at the bottommost part is 8mm, the aperture of the grouting hole at the topmost part is 4mm, and the distance between two adjacent grouting holes is 250-300 mm.
Example 2
On the basis of the embodiment 1, the combination of the angle 1 and the plugging steel plate can be replaced by round steel 4, and specifically, refer to fig. 3 and fig. 4: the round steel 4 is fixedly connected with the first flange 12 and the web 11 or fixedly connected with the second flange 13 and the web 11; wherein, the round steel 4 is a cylinder structure.
Specifically, as shown in fig. 6 and 7, the construction method includes the following steps:
s1, changing the section shape of the section steel, (welding L-shaped steel or round steel at the web plate position of the section steel), and after the mixing pile is completed by combining the construction scheme of the section steel cement soil mixing pile, putting the section steel with the changed section into the triaxial mixing pile 7 of the groove, and filling cement soil in the groove;
s2, completing an underground main body structure, achieving the design strength, densely filling the space between the side wall and the section steel cement soil stirring wall (a fertilizer tank), pulling out the section steel after the crown beam cleaning work is done, and forming a first pipe preformed hole 8 and a second pipe preformed hole 9 in the groove;
s3, inserting the steel pipe and the splitting grouting pipe 5 into the first pipe preformed hole 8 and the second pipe preformed hole 9 respectively; filling pure cement slurry into the PVC pipe, and pulling out the PVC pipe while grouting; solidifying for 6-10 hours after grouting;
s4, grouting in layers through the split grouting pipe 5; stopping grouting after the pressure is stabilized at 2.0MPa, generating fracture in the initial setting cement slurry, diffusing along the fracture, and pulling out the fracture grouting pipe 5.
And S5, filling and compacting the gap formed by pulling out the section steel 1 by grouting equipment.
In the step 3, the grouting pressure for filling the pure cement slurry through the PVC pipe is 0.6-1.0MPa, and the water-cement ratio is 1: 0.5, and the aperture of the PVC pipe is 25 mm.
In the step 4, the initial grouting pressure is 0.8-1.5MPa, the final grouting pressure is 2.0MPa, the plastic adhesive tape at the bottom grout outlet of the split grouting pipe 5 is firstly washed away by the grout, and then the plastic adhesive tape of the grouting hole 6 from bottom to top is washed away by the grout in sequence, so that layered grouting is realized.
It should be noted that: and after the section steel is pulled out of the gap, a secondary splitting grouting process is adopted, the grouting pressure required by the primary grouting is not less than 0.6MPa, and the secondary grouting pressure is 0.8-1.5 MPa. PVC pipe and splitting slip casting pipe need insert simultaneously with the anchor rope owner muscle and reserve the space, and PVC pipe and splitting slip casting pipe all extend the hole bottom, and splitting slip casting pipe adopts the welded tube of diameter DN20 mm. Grouting sequence: the grouting amount of the first grouting is not less than the theoretical calculation amount, and the second high-pressure grouting is started at intervals of 8-10 hours. The slip casting hole adopts the cross to wearing the setting, because splitting slip casting pipe lower extreme trompil to the slip casting hole from the bottom up space reduces gradually, and 6 meters on upper portion do not trompil, because the big lower part trompil of liquid level difference lower part pressure is at first washed away by the thick liquid, has guaranteed to form the effect that the cross-section enlarges by the requirement and each trompil department that lower supreme trompil was opened in proper order, both can guarantee the purpose of construction, construction convenience moreover.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. The construction method for constructing the large-thickness collapsible loess foundation by utilizing the section steel cement soil mixing wall is characterized by comprising the following steps of:
s1, putting the section steel (1) into the triaxial mixing pile (7) of the groove, and filling cement soil into the groove;
s2, pulling out the section steel (1) by using hoisting equipment, and forming a first pipe preformed hole (8) and a second pipe preformed hole (9) in the groove;
s3, inserting the steel pipe and the splitting grouting pipe (5) into the first pipe preformed hole (8) and the second pipe preformed hole (9) respectively; filling pure cement slurry into the PVC pipe, and pulling out the PVC pipe while grouting; solidifying for 6-10 hours after grouting;
s4, performing layered grouting through the split grouting pipe (5); stopping grouting after the pressure is stabilized at 2.0MPa, and pulling out the split grouting pipe (5).
And S5, filling and compacting the gap formed by pulling out the section steel (1) by grouting equipment.
2. The construction method for constructing a large-thickness collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 1, wherein in the step 3, the grouting pressure for injecting pure cement slurry through the PVC pipe is 0.6-1.0MPa, the water cement ratio is 1: 0.5, and the aperture of the PVC pipe is 25 mm.
3. The construction method for constructing the large and thick collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 1, wherein in the step 4, the initial grouting pressure is 0.8-1.5MPa, the final grouting pressure is 2.0MPa, the plastic adhesive tape at the bottom grout outlet of the split grouting pipe (5) is firstly washed away by the grout, and then the plastic adhesive tape of the grouting hole (6) from bottom to top is sequentially washed away by the grout to realize layered grouting.
4. The construction method for constructing the large-thickness collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 1, wherein the section steel (1) is an I-shaped steel;
the section steel (1) comprises a web plate (11), a first flange (12) and a second flange (13) which are integrally formed;
a first pipe reserved part is arranged on one side of the web plate (11), and the first pipe reserved part is fixedly connected with the web plate (11) and the first flange (12);
the other side of web (11) is provided with the second pipe and reserves the piece, the second pipe reserve the piece with web (11) and second flange (13) all fixed connection.
5. The construction method for constructing the large-thickness collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 4, wherein the first pipe preserved piece and the second pipe preserved piece have the same structure.
6. The construction method for constructing the large-thickness collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 5, wherein the first pipe reserved part and the second reserved part are angle steel (2), and the angle steel (2) is fixedly connected with the first flange (12)/the second flange (13) and the web (11) respectively;
the angle steel (2) bottom is provided with shutoff steel sheet (3), shutoff steel sheet (3) are the rectangle steel sheet, the rectangle steel sheet with angle steel (2) and shaped steel are full weld respectively and are connected.
7. The construction method for constructing the large-thickness collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 5, wherein the first pipe reserved part is a round steel (4), and the round steel (4) is fixedly connected with the first flange (12)/the second flange (13) and the web (11) respectively;
the round steel (4) is of a cylindrical structure.
8. The construction method for constructing the large and thick collapsible loess foundation by using the section steel cement soil mixing wall as claimed in claim 4, wherein the construction equipment further comprises a split grouting pipe (5);
a plurality of grouting holes (6) are formed in the pipe body part of the split grouting pipe (5);
and one ends of the grouting holes (6) and the splitting grouting pipes (5) are sealed by plastic adhesive tapes.
9. The construction method for constructing the large and thick collapsible loess foundation by using the section steel cement soil mixing wall as defined in claim 8, wherein the initial grouting holes (6) are located 6m away from the top of the split grouting pipes (5), and the diameters of the grouting holes (6) are gradually reduced from bottom to top.
10. The construction method for constructing a large and thick collapsible loess foundation by using the section steel soil cement mixing wall as claimed in claim 9, wherein the plurality of grouting holes (6) are arranged in a quincunx pattern.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210078751.XA CN114319314A (en) | 2022-01-24 | 2022-01-24 | Construction method for constructing large-thickness collapsible loess foundation by utilizing profile steel cement soil mixing wall |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210078751.XA CN114319314A (en) | 2022-01-24 | 2022-01-24 | Construction method for constructing large-thickness collapsible loess foundation by utilizing profile steel cement soil mixing wall |
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| CN114319314A true CN114319314A (en) | 2022-04-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0913369A (en) * | 1995-06-30 | 1997-01-14 | Taisei Corp | Method for filling concrete for cast-in-place steel pipe concrete pile and device for confirmation of filling and device for taking sample |
| JPH11158865A (en) * | 1997-11-28 | 1999-06-15 | Kawasaki Steel Corp | Underground structure having wall using steel sheet pile as core and method for constructing the same |
| US20100054859A1 (en) * | 2006-11-24 | 2010-03-04 | Fu Rong He | Hydraulic Sliding Insertion Panel and Its Using Method |
| CN208533543U (en) * | 2018-07-16 | 2019-02-22 | 北京市政建设集团有限责任公司 | Improve the structure and foundation pit SMW supporting construction of foundation pit side-wall waterproof performance |
| CN209260711U (en) * | 2018-12-13 | 2019-08-16 | 中冶集团武汉勘察研究院有限公司 | Synchronous device for filling is pulled out in a kind of SMW engineering method stake |
-
2022
- 2022-01-24 CN CN202210078751.XA patent/CN114319314A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0913369A (en) * | 1995-06-30 | 1997-01-14 | Taisei Corp | Method for filling concrete for cast-in-place steel pipe concrete pile and device for confirmation of filling and device for taking sample |
| JPH11158865A (en) * | 1997-11-28 | 1999-06-15 | Kawasaki Steel Corp | Underground structure having wall using steel sheet pile as core and method for constructing the same |
| US20100054859A1 (en) * | 2006-11-24 | 2010-03-04 | Fu Rong He | Hydraulic Sliding Insertion Panel and Its Using Method |
| CN208533543U (en) * | 2018-07-16 | 2019-02-22 | 北京市政建设集团有限责任公司 | Improve the structure and foundation pit SMW supporting construction of foundation pit side-wall waterproof performance |
| CN209260711U (en) * | 2018-12-13 | 2019-08-16 | 中冶集团武汉勘察研究院有限公司 | Synchronous device for filling is pulled out in a kind of SMW engineering method stake |
Non-Patent Citations (2)
| Title |
|---|
| 何凤阳;: "水泥土搅拌连续墙施工应用技术", 山西建筑, no. 33, pages 156 - 157 * |
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