CN111501779B - Combined flexible support integrated construction method for building deep foundation pit engineering - Google Patents
Combined flexible support integrated construction method for building deep foundation pit engineering Download PDFInfo
- Publication number
- CN111501779B CN111501779B CN202010373742.4A CN202010373742A CN111501779B CN 111501779 B CN111501779 B CN 111501779B CN 202010373742 A CN202010373742 A CN 202010373742A CN 111501779 B CN111501779 B CN 111501779B
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- Prior art keywords
- foundation pit
- wire mesh
- steel wire
- frame
- side slope
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- 238000010276 construction Methods 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 60
- 239000010959 steel Substances 0.000 claims abstract description 60
- 239000004567 concrete Substances 0.000 claims abstract description 15
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 238000003780 insertion Methods 0.000 claims abstract description 9
- 230000037431 insertion Effects 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 4
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000008093 supporting effect Effects 0.000 abstract description 17
- 230000003139 buffering effect Effects 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 239000011378 shotcrete Substances 0.000 abstract description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
Abstract
The invention discloses a composite flexible support integrated construction method for building deep foundation pit engineering, and belongs to the technical field of foundation pit support. The construction method comprises the following steps: rapidly spraying concrete to the trimmed side slope, and closing the side slope of the foundation pit in time; after the concrete is solidified, drilling holes, injecting cement slurry into anchor holes, and inserting anchor rods; the prefabricated steel wire mesh frames are installed on the foundation pit side slope after the anchor rod construction is finished, two adjacent steel wire mesh frames are connected with the end part of the anchor rod through a connecting assembly, an insertion end is reserved at the bottom of each steel wire mesh frame, and the insertion end is inserted at the bottom of the foundation pit during construction; and (5) secondarily spraying concrete on the installed prefabricated steel wire mesh frame. The steel wire mesh frame with the supporting and supporting functions, the elastic filler with the buffering function, the anchor rod with the reinforcing function and the sprayed concrete form a combined flexible supporting system, the supporting effect is greatly changed, and the prefabricated components enable construction to be convenient and efficient.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a combined type flexible supporting integrated construction method for building deep foundation pit engineering.
Background
The foundation pit support is a supporting, blocking, reinforcing and protecting measure adopted for the side wall of the foundation pit and the surrounding environment in order to ensure the safety of the construction of an underground structure and the surrounding environment of the foundation pit.
With the increasing of high-rise buildings, the importance of foundation pit engineering is remarkable, as most foundation pits are constructed in dense-population buildings and dense-underground and overground municipal-pipeline buildings, the requirements on stability and displacement of the foundation pits are controlled strictly, and with the full utilization of underground space, the depth of the foundation pits is increased continuously, and the requirements on foundation pit support are higher.
The flexible supporting structure in the prior art is generally composed of row piles or continuous walls, the lower end of the flexible supporting structure is embedded into a soil body, an additional supporting effect is obtained through anchor rods or an inner supporting system, the flexible supporting structure in the prior art is generally elastically embedded, the flexible supporting construction in the prior art is generally field construction, the construction efficiency is low, and the adjacent row piles or the continuous walls are in rigid connection, so that the supporting effect is poor.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a composite flexible support integrated construction method for building deep foundation pit engineering.
The invention provides a composite flexible support integrated construction method for building deep foundation pit engineering, which comprises the following steps:
s1, leveling the foundation pit side slope;
s2, quickly spraying concrete to the side slope trimmed in the step S1, and closing the side slope of the foundation pit in time;
s3, after the concrete in the step S2 is solidified, drilling holes according to the design requirements of support, injecting cement slurry into the anchor holes, and inserting anchor rods;
s4, mounting prefabricated steel wire mesh frames on the side slope of the foundation pit after the anchor rod construction is finished, connecting two adjacent steel wire mesh frames with the end part of the anchor rod through a connecting component, reserving an insertion end at the bottom of each steel wire mesh frame, and inserting the insertion ends into the bottom of the foundation pit during construction;
and S5, spraying concrete on the prefabricated steel wire mesh frame for the second time.
Preferably, the connecting assembly comprises a butterfly-shaped member arranged at the outer end part of the anchor rod, the outer edges of two sides of the butterfly-shaped member are both V-shaped edges, and each V-shaped edge comprises a first oblique edge and a second oblique edge; be located and be equipped with V type component on the wire netting frame of butterfly-shaped component both sides, the outward flange of V type component includes third hypotenuse and fourth hypotenuse, third hypotenuse and first hypotenuse sliding connection, be equipped with a set of spacing tooth on fourth hypotenuse and the second hypotenuse, spacing tooth is used for limiting the sliding of V type component through the spacing tooth that sets up on fourth hypotenuse and the second hypotenuse after third hypotenuse cunning shifts to the fourth hypotenuse along first hypotenuse.
Preferably, a sliding groove is formed in the first bevel edge, a sliding block is arranged on the third bevel edge, the sliding block is located in the sliding groove, and the sliding block is connected with one end, close to the foundation pit side slope, of the sliding groove through a spring.
Preferably, the outer portion of the steel wire mesh frame is further provided with a limiting steel plate, the outer end of the butterfly-shaped component is fixed on the limiting steel plate, the limiting steel plate is connected with the frame of the steel wire mesh frame through a bolt, and a spring assembly is arranged in a gap between the limiting steel plate and the steel wire mesh frame.
Preferably, the method for manufacturing the prefabricated steel wire mesh frame is as follows; prepare frame material and wire net, make frame type structure with frame material end to end connection, two frame bottoms of vertical setting reserve the portion of inserting that is used for inserting underground, weld the wire net on the frame of making again.
Preferably, the steel wire meshes are arranged in two layers, and elastic filler is filled between the two layers of steel wire meshes.
Preferably, still including setting up the bracing on two steel wire mesh frames at foundation ditch corner, the bracing is on a parallel with ground and from bottom to top equidistant setting a plurality ofly, the bracing constitutes the isosceles triangle structure with two foundation ditch slope faces that correspond.
Preferably, the spraying sequence of the sprayed concrete in the step S5 is from top to bottom, the spray head is vertically directed to the wire mesh frame, and the distance between the spray head and the wire mesh frame is 0.5-0.8 m.
Preferably, the anchor eye in step S3 has an aperture inclination of 15 ° with a deviation of less than 5%.
Preferably, in the step S3, multiple rows of anchor rods are arranged on the side slope of the foundation pit from bottom to top, and the distance between adjacent anchor rods is 1.0-1.5 m.
Compared with the prior art, the invention has the beneficial effects that: the steel wire mesh frame is a prefabricated part, can be processed in a factory in advance, and can be installed after being transported to a construction site, so that the construction period is shortened, and the construction efficiency is improved;
the steel wire mesh frame can be spliced to meet the support requirements of different foundation pit sizes, and has universality;
the steel wire mesh frame can effectively cover and support the deep foundation pit side slope in time, effectively absorb dynamic stress generated during side slope displacement, has a supporting and buffering effect, and the anchor rod and the deep foundation pit protection slope are integrated to jointly bear elastic strain so as to improve the self-bearing stress of the deep foundation pit side slope.
The steel wire mesh frame is connected with the anchor rod through the butterfly-shaped component and the V-shaped component, so that the limit on excessive deformation can be realized on the basis of consuming stress through limited deformation, and the flexible supporting effect can be better realized on the basis of providing additional support by skillfully connecting the anchor rod with the steel wire mesh frame.
Drawings
Fig. 1 is a top view of the composite flexible supporting system of the present embodiment;
FIG. 2 is a schematic structural diagram of the wire mesh frame of the present embodiment;
fig. 3 is a schematic structural view of the connecting assembly of the present embodiment;
fig. 4 is a partially enlarged view of the connection between the butterfly member and the V-shaped member according to the present embodiment.
Description of reference numerals:
1. the foundation pit comprises a foundation pit slope, 2 primary concrete, 3 anchor rods, 4 steel wire mesh frames, 5 diagonal braces, 6 insertion ends, 7 elastic fillers, 8 butterfly-shaped members, 81 first bevel edges, 82 second bevel edges, 9V-shaped members, 91 third bevel edges, 92 fourth bevel edges, 10 limiting teeth, 11 sliding blocks, 12 springs, 13 limiting steel plates, 14 bolts and 15 spring assemblies.
Detailed Description
Detailed description of the preferred embodimentsthe following detailed description of the present invention will be given with reference to the accompanying drawings 1-4, but it should be understood that the scope of the present invention is not limited to the specific embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The invention provides a composite flexible support integrated construction method for building deep foundation pit engineering, which comprises the following steps:
s1, leveling the foundation pit side slope 1;
s2, rapidly spraying primary concrete 2 on the side slope trimmed in the step S1, and closing the side slope of the foundation pit in time;
s3, after the concrete in the step S2 is solidified, drilling according to the design requirement of support, injecting cement slurry into the anchor hole, and inserting the anchor rod 3;
s4, mounting prefabricated steel wire mesh frames 4 on the foundation pit side slope 1 after the anchor rod 3 is constructed, connecting two adjacent steel wire mesh frames 4 with the end part of the anchor rod 3 through a connecting component, reserving insertion ends 6 at the bottoms of the frames of the steel wire mesh frames 4, and inserting the insertion ends 6 at the bottom of the foundation pit during construction;
and S5, spraying concrete on the prefabricated steel wire mesh frame 4 for the second time.
Example 2
On the basis of embodiment 1, in order to enhance the effect of flexible support, the connecting assembly of this embodiment includes a butterfly-shaped member 8 disposed at the outer end of the anchor rod 3, the outer edges of both sides of the butterfly-shaped member 8 are both V-shaped edges, and the V-shaped edges include a first oblique edge 81 and a second oblique edge 82; be located and be equipped with V type component 9 on the wire mesh frame 4 of butterfly component 8 both sides, the outward flange of V type component 9 includes third hypotenuse 91 and fourth hypotenuse 92, third hypotenuse 91 and first hypotenuse 81 sliding connection, be equipped with a set of spacing tooth 10 on fourth hypotenuse 92 and the second hypotenuse 82, spacing tooth 10 is used for when third hypotenuse 91 along first hypotenuse 81 slip to fourth hypotenuse 92 after, restricts the slip of V type component 9 through the spacing tooth 10 that sets up on fourth hypotenuse 92 and the second hypotenuse 82.
Wherein, be equipped with the spout on the first hypotenuse 81, be equipped with slider 11 on the third hypotenuse 91, slider 11 is located the spout and slider 11 passes through spring 12 and is connected with the one end that the spout is close to foundation ditch side slope 1.
The outer portion of the steel wire mesh frame 4 is further provided with a limiting steel plate 13, the outer end of the butterfly-shaped component 8 is fixed on the limiting steel plate 13, the limiting steel plate 13 is connected with the frame of the steel wire mesh frame 4 through a bolt 14, and a spring assembly 15 is arranged in a gap between the limiting steel plate 13 and the steel wire mesh frame 4.
In this embodiment, when the foundation pit slope 1 is shifted and changed, when the wire mesh frame 4 receives an outward thrust, the third bevel edge 91 of the V-shaped member 9 at the end of the wire mesh frame 4 slides down along the first bevel edge 81 of the butterfly-shaped member 8, if the stress is large, the fourth bevel edge 92 contacts with the second bevel edge 82, and the fourth bevel edge 92 engages with the limit teeth 10 on the second bevel edge 82 to limit relative sliding. The sliding connection of the first angled edge 81 and the third angled edge 91 in this embodiment enables the movement of the wire frame 4 to be limited such that the fourth angled edge 92 engages the limiting teeth 10 on the second angled edge 82.
The manufacturing method of the prefabricated steel wire mesh frame 4 comprises the following steps of; prepare frame material and wire net, make frame type structure with frame material end to end connection, two frame bottoms of vertical setting reserve the portion of inserting that is used for inserting underground, weld the wire net on the frame of making again.
The steel wire meshes on the steel wire mesh frame are arranged into two layers, and elastic fillers 7 are filled between the two layers of steel wire meshes. The periphery of the steel wire mesh frame is sealed, so that the elastic filler 7 is prevented from leaking.
Wherein, still including setting up bracing 5 on two wire mesh frames 4 of foundation ditch corner, bracing 5 is on a parallel with ground and from bottom to top equidistant setting a plurality ofly, bracing 5 constitutes the isosceles triangle structure with two foundation ditch side slopes 1 faces that correspond.
Wherein, the spraying sequence of the concrete spraying in the step S5 is from top to bottom, the spray head vertically points to the steel wire mesh frame, and the distance between the spray head and the steel wire mesh frame is 0.5-0.8 m.
Wherein, the hole inclination angle of the anchor hole in the step S3 is 15 degrees, and the deviation is less than 5 percent.
Wherein, in the step S3, a plurality of rows of anchor rods are arranged on the side slope of the foundation pit from bottom to top, and the distance between adjacent anchor rods is 1.0-1.5 m.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A composite flexible support integrated construction method for building deep foundation pit engineering is characterized by comprising the following steps:
s1, leveling the foundation pit side slope;
s2, quickly spraying concrete to the side slope trimmed in the step S1, and closing the side slope of the foundation pit in time;
s3, after the concrete in the step S2 is solidified, drilling holes according to the design requirements of support, injecting cement slurry into the anchor holes, and inserting anchor rods;
s4, mounting prefabricated steel wire mesh frames on the side slope of the foundation pit after the anchor rod construction is finished, connecting two adjacent steel wire mesh frames with the end part of the anchor rod through a connecting component, reserving an insertion end at the bottom of each steel wire mesh frame, and inserting the insertion ends into the bottom of the foundation pit during construction;
the connecting assembly comprises a butterfly-shaped member arranged at the outer end part of the anchor rod, the outer edges of two sides of the butterfly-shaped member are both V-shaped edges, and each V-shaped edge comprises a first oblique edge and a second oblique edge; the steel wire mesh frames positioned on two sides of the butterfly-shaped member are provided with V-shaped members, the outer edges of the V-shaped members comprise third bevel edges and fourth bevel edges, the third bevel edges are connected with the first bevel edges in a sliding mode, the fourth bevel edges and the second bevel edges are provided with a group of limiting teeth, and the limiting teeth are used for limiting the sliding of the V-shaped members through the limiting teeth arranged on the fourth bevel edges and the second bevel edges after the third bevel edges slide to the fourth bevel edges along the first bevel edges;
and S5, spraying concrete on the prefabricated steel wire mesh frame for the second time.
2. The method of claim 1, wherein the first bevel edge is provided with a sliding groove, the third bevel edge is provided with a sliding block, the sliding block is located in the sliding groove, and the sliding block is connected with one end of the sliding groove close to the side slope of the foundation pit through a spring.
3. The method of claim 1, wherein a limiting steel plate is further provided outside the wire mesh frame, the outer end of the butterfly member is fixed to the limiting steel plate, the limiting steel plate is connected to the frame of the wire mesh frame by bolts, and a spring assembly is provided in a gap between the limiting steel plate and the wire mesh frame.
4. The composite flexible support integrated construction method for building deep foundation pit engineering of claim 1, wherein the manufacturing method of the prefabricated steel wire mesh frame is as follows; prepare frame material and wire net, make frame type structure with frame material end to end connection, two frame bottoms of vertical setting reserve the portion of inserting that is used for inserting underground, weld the wire net on the frame of making again.
5. The composite flexible support integrated construction method for building the deep foundation pit project according to claim 1, wherein two layers of steel wire meshes are arranged on the steel wire mesh frame, and elastic filler is filled between the two layers of steel wire meshes.
6. The method of claim 1, further comprising a plurality of diagonal braces disposed on the two wire frames at the corners of the foundation pit, wherein the diagonal braces are parallel to the ground and are disposed from bottom to top at equal intervals, and the diagonal braces and the corresponding two slopes of the foundation pit form an isosceles triangle structure.
7. The composite type flexible support integrated construction method for building deep foundation pit engineering of claim 1, wherein the spraying sequence of the concrete spraying in the step S5 is from top to bottom, the spray head is vertically directed to the steel wire mesh frame, and the distance between the spray head and the steel wire mesh frame is 0.5-0.8 m.
8. The composite flexible support integrated construction method for building the deep foundation pit project according to claim 1, wherein the hole inclination angle of the anchor hole in the step S3 is 15 ° and the deviation is less than 5%.
9. The composite flexible support integrated construction method for building the deep foundation pit project of claim 1, wherein in the step S3, a plurality of rows of anchor rods are arranged on the side slope of the foundation pit from bottom to top, and the distance between adjacent anchor rods is 1.0-1.5 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010373742.4A CN111501779B (en) | 2020-05-06 | 2020-05-06 | Combined flexible support integrated construction method for building deep foundation pit engineering |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010373742.4A CN111501779B (en) | 2020-05-06 | 2020-05-06 | Combined flexible support integrated construction method for building deep foundation pit engineering |
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| Publication Number | Publication Date |
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| CN111501779A CN111501779A (en) | 2020-08-07 |
| CN111501779B true CN111501779B (en) | 2021-06-08 |
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| CN112663621B (en) * | 2020-12-17 | 2022-07-12 | 长沙理工大学 | Combined type flexible supporting integrated supporting system for building deep foundation pit engineering |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080006693U (en) * | 2007-06-27 | 2008-12-31 | 박정식 | A removal type earth anchor |
| CN101122132B (en) * | 2007-09-03 | 2010-06-09 | 中铁建设集团有限公司 | Demountable composite material face plate brad supporting system and its construction method |
| CN201891116U (en) * | 2010-11-02 | 2011-07-06 | 孙涛 | Wall supporting system comprising flexible surface layer and soil nails |
| CN103147444A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
| CN208792338U (en) * | 2018-07-18 | 2019-04-26 | 深圳市稳健基础工程有限公司 | A kind of foundation pit supporting construction |
| CN109868826A (en) * | 2019-03-13 | 2019-06-11 | 温州开源建设工程有限公司 | A kind of well-set foundation pit and its earthwork digging method |
-
2020
- 2020-05-06 CN CN202010373742.4A patent/CN111501779B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080006693U (en) * | 2007-06-27 | 2008-12-31 | 박정식 | A removal type earth anchor |
| CN101122132B (en) * | 2007-09-03 | 2010-06-09 | 中铁建设集团有限公司 | Demountable composite material face plate brad supporting system and its construction method |
| CN201891116U (en) * | 2010-11-02 | 2011-07-06 | 孙涛 | Wall supporting system comprising flexible surface layer and soil nails |
| CN103147444A (en) * | 2013-03-24 | 2013-06-12 | 中铁二院工程集团有限责任公司 | Foundation pit enclosure structure capable of realizing supporting while excavating and foundation pit excavating method |
| CN208792338U (en) * | 2018-07-18 | 2019-04-26 | 深圳市稳健基础工程有限公司 | A kind of foundation pit supporting construction |
| CN109868826A (en) * | 2019-03-13 | 2019-06-11 | 温州开源建设工程有限公司 | A kind of well-set foundation pit and its earthwork digging method |
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