CN114673170A - Rapid supporting structure and method for working well foundation pit in narrow space - Google Patents
Rapid supporting structure and method for working well foundation pit in narrow space Download PDFInfo
- Publication number
- CN114673170A CN114673170A CN202210466012.8A CN202210466012A CN114673170A CN 114673170 A CN114673170 A CN 114673170A CN 202210466012 A CN202210466012 A CN 202210466012A CN 114673170 A CN114673170 A CN 114673170A
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- foundation pit
- purlin
- lattice column
- supporting
- sleeve box
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 8
- 238000010276 construction Methods 0.000 claims abstract description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000009412 basement excavation Methods 0.000 description 7
- 239000002689 soil Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
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- 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
- E02D17/06—Foundation trenches ditches or narrow shafts
- E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
- E02D17/083—Shoring struts
Abstract
The invention provides a rapid supporting structure and a rapid supporting method for a foundation pit of a working well in a narrow space, and relates to the technical field of foundation pit supporting. This structure includes the pouring jacket, encloses purlin, angle brace and first lattice column, and the pouring jacket is including four backup pads that connect gradually, and the inside end angle department of pouring jacket is provided with first lattice column, the vertical setting of first lattice column, and the bottom of first lattice column stretches into to the pit bottom of foundation ditch in. Enclose the purlin and be the rectangle structure, enclose the side and the backup pad internal surface connection of purlin, the end angle department of enclosing the purlin is provided with the gusset, and the both ends of gusset are connected respectively on the purlin that encloses of two adjacent backup pads. The sleeve box can be manufactured firstly to excavate the foundation pit, the sleeve box is fast and simple to fix, and the time for supporting the foundation pit is greatly shortened, so that the construction efficiency is improved, and the road occupation time and the influence on traffic are greatly reduced. This structure is provided with encloses purlin and gusset, supports the pouring jacket, has guaranteed the stability of pouring jacket to provide good supporting effect.
Description
Technical Field
The invention relates to the technical field of foundation pit supporting, in particular to a rapid supporting structure and a rapid supporting method for a working well foundation pit in a narrow space.
Background
In municipal engineering, the excavation depth of a large pipeline working well is about 6m generally, and a steel sheet pile is generally adopted for foundation pit support before excavation. The steel sheet pile support saves time and labor, is low in cost, and is difficult to support by using the steel sheet pile under special conditions, such as poor soil conditions of a field, no construction operation positions around the field, the influence of vibration on old pipelines around the field, and incapability of occupying municipal traffic roads for a long time.
For example, in the construction of a double-well chamber structure, one is a mud discharging wet well with the diameter of 1.2m, the other is a mud discharging dry well with the diameter of 1.4m, the thickness of the wall body is 0.24m, the clear distance between the two wells is not less than 1.0m, the minimum distance between the well chamber and the main pipeline is 2.0m, and the well chamber is parallel to the main pipeline. Considering the basic size of the well chamber and ensuring the working surface with the width of at least 0.5m, the minimum excavation size of the length and the width of the foundation pit of the well chamber is considered according to 6 m. In the engineering, because the pipeline engineering is positioned on a non-motor lane of the existing municipal road, the total width of the road is 15m, and the urban north-south traffic junction can not be closed. In order to reduce the influence on road traffic to the maximum extent, construction equipment with a small construction operation surface is required to be selected, and the operation surface and the road occupation construction time of the pipe shaft construction are reduced as much as possible. Under the condition of avoiding crowded soil pile construction to cause pipeline deformation and road uplift in the town road, reduce the vertical subsidence and the horizontal displacement of road to minimum, the drilling bored concrete pile technology among the prior art can occupy more construction operation face, and the crowded soil problem of steel sheet pile technology is more serious and construction noise is great, and high pressure slip casting forms the curtain mode because intensity is lower and construction maintenance phase is longer, does not conform to on-the-spot actual requirement. Therefore, a new foundation pit supporting structure of the working well in a narrow space is needed for supporting the foundation pit.
Disclosure of Invention
In view of the above, the present invention provides a fast supporting structure and method for a small space working well pit to solve the above problems.
Based on the above purpose, the invention provides a rapid supporting structure for a foundation pit of a working well in a narrow space, which comprises: the device comprises a sleeve box, a surrounding purlin, corner supports and lattice columns; the sleeve box comprises four supporting plates which are sequentially connected, a first lattice column is arranged at an end corner inside the sleeve box and is vertically arranged, and the bottom of the first lattice column extends into the bottom of the foundation pit; enclose the purlin and be the rectangle structure, enclose the side and the backup pad internal surface connection of purlin, the end angle department of enclosing the purlin is provided with the gusset, and the both ends of gusset are connected respectively on the purlin that encloses of two adjacent backup pads.
Further, this device still includes second lattice column, and second lattice column sets up in the corner brace and encloses the hookup location of purlin, and the vertical setting of second lattice column, the bottom of second lattice column stretch into to the bottom of a pit of foundation ditch in.
Further, the supporting plate is a rectangular steel plate; the stability of the support is ensured.
The method for quickly supporting the foundation pit of the working well in the narrow space comprises the following steps:
s1, manufacturing a sleeve box, and welding a surrounding purlin and a corner brace in the sleeve box;
s2, hoisting the sleeve box into the foundation pit for fixing;
s3, mounting first lattice columns at four end corners of the sleeve box respectively, and driving the first lattice columns into the bottom of the foundation pit;
and S4, mounting a second lattice column at the end corner of the corner support, and driving the second lattice column into the bottom of the foundation pit to complete the support of the foundation pit.
Compared with the prior art, the invention has the beneficial effects that: accomplish the pouring jacket preparation before carrying out foundation ditch support, the pouring jacket is put into to the foundation ditch as an overall structure, and first lattice column of rethread and second lattice column are fixed the pouring jacket, install the pouring jacket in the foundation ditch, realize the supporting effect to the foundation ditch. The sleeve box can be manufactured firstly to excavate the foundation pit, the sleeve box is fast and simple to fix, and the time for supporting the foundation pit is greatly shortened, so that the construction efficiency is improved, and the road occupation time and the influence on traffic are greatly reduced. This device is provided with encloses purlin and gusset, supports the pouring jacket, has guaranteed the stability of pouring jacket to provide good supporting effect.
Drawings
Fig. 1 is a top view of a foundation pit quick supporting structure of a working well in a narrow space according to an embodiment of the present invention;
fig. 2 is a partial schematic view of a foundation pit quick supporting structure of a working well in a narrow space according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of a foundation pit quick supporting structure of a working well in a narrow space according to an embodiment of the present invention;
fig. 4 is a schematic perspective view of a foundation pit quick supporting structure of a working well in a narrow space provided in an embodiment of the present invention.
Description of the drawings are labeled: 1. sleeving a box; 2. enclosing purlins; 3. corner brace; 4. a first lattice column; 5. a second lattice column.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to specific embodiments below.
As shown in fig. 1, the rapid supporting structure for a foundation pit of a working well in a narrow space provided by the invention comprises a casing 1, an enclosing purlin 2, a corner brace 3, a first lattice column 4, a second lattice column 5 and the like. The pouring jacket 1 comprises four backup pads that connect gradually, and the backup pad is the rectangle steel sheet, and four backup pads end to end, the welding is in the same place, forms the pouring jacket 1 of cuboid structure. The inside end angle department of pouring jacket 1 is provided with first lattice column 4, and the vertical setting of first lattice column 4 sets up two first lattice columns 4 respectively in every end angle department, as shown in fig. 2, two first lattice columns 4 are mutually perpendicular, hug closely with the backup pad respectively, and the bottom of first lattice column 4 stretches into to the bottom of a pit of foundation ditch in. Enclose purlin 2 and be the rectangle structure, enclose the side and the backup pad internal surface connection of purlin 2, the end angle department of enclosing purlin 2 is provided with gusset 3, and the both ends of gusset 3 are connected respectively on enclosing purlin 2 of two adjacent backup pads, play the effect of strutting to pouring jacket 1. As shown in fig. 3, the second lattice column 5 is arranged at the connecting position of the corner brace 3 and the surrounding purlin 2, the second lattice column 5 is vertically arranged, and the bottom of the second lattice column 5 extends into the bottom of the foundation pit.
The method for quickly supporting the foundation pit of the working well in the narrow space comprises the following steps:
and S1, determining the size of the jacket 1 according to the size of the pipeline working well and the working face condition on the design drawing, and manufacturing the jacket 1. Selecting four rectangular steel plates with the thickness of 20mm, connecting the ends of the four steel plates in sequence by adopting a full-length welding mode, and welding the four steel plates into the rectangular pouring jacket 1. And (2) manufacturing the enclosing purlins by using No. 20a I-steel, welding the enclosing purlins 2 on the inner wall of the jacket 1, and uniformly distributing the enclosing purlins 2 at equal intervals. The four end corners of the enclosing purlin 2 are respectively welded with the corner supports 3 with the length of 1m, the two ends of each corner support 3 are respectively welded on the enclosing purlin 2 of the two adjacent steel plates, and the corner supports 3 play a role in supporting and protecting, so that the sleeve box 1 is more stable.
And (3) according to the well position center coordinates of the pipeline working well in the design drawing, using a GPS instrument to perform measurement and positioning, and marking the position of the working well by using spray paint. And determining the central line of the pipeline and the lower opening line and the upper opening line of the excavation position through the position of the working well. And (3) breaking a pavement structure within the range of an excavation line by using a breaking hammer, excavating a first layer of roadbed structure layer with the thickness of 1.5m by using an excavator, carrying out slope release according to the slope release coefficient of 1:0.1, and intensively storing abandoned soil for later use when the roadbed is to be restored. And (5) continuously downward sloping by using an excavator, wherein the sloping coefficient is 1:0.2, and downward excavation is carried out for 1.5 m. And then continuously carrying out slope releasing according to the slope releasing coefficient of 1:0.2 by using a long-arm excavator, downwards excavating to the position 200mm above the substrate, wherein the excavation size of the foundation pit is preferably about 200mm wider than each side of the steel sleeve box 1.
And S2, hoisting the jacket 1 into the foundation pit by using a crane, considering the weight and the hoisting distance, wherein the maximum prefabricated component is about 7t, the depth of the foundation pit is 6m, and the distance between the center of the component and the edge of the foundation pit is 3 m. A50 t crane is adopted, the station is 5m away from the side of the pit, the operation radius is 10.5m, and the hoisting height can not be considered due to hoisting in the foundation pit.
S3, as shown in fig. 4, the first lattice columns 4 are respectively installed at the four end corners of the jacket 1, and the first lattice columns 4 are driven into the bottom of the foundation pit with a hydraulic vibration hammer, with the embedding depth of 1.5 m.
And S4, mounting the second latticed column 5 at the end corner of the corner brace 3, and driving the second latticed column 5 into the bottom of the foundation pit by using a hydraulic vibration hammer, wherein the embedding depth is 1.5m, so as to complete the support of the foundation pit.
And (3) carrying out bottom plate construction: manually removing the reserved soil with the thickness of 200mm above the base, not removing the soil body belonging to the range of the operation surface, and then carrying out concrete construction of the cushion layer. The construction is carried out according to the design requirement, the cushion layer is cast by C25 commercial concrete, and the thickness of the cushion layer is not less than 40mm during the construction.
And then carrying out mud discharge valve, pipe fitting connection and well chamber masonry construction according to design requirements and construction specifications. And after the well chamber is built, covering the well chamber cover plate, and lifting the supporting structure out by using a crane.
And backfilling the foundation pit layer by layer, compacting by adopting a hydraulic vibration rammer after backfilling the foundation pit layer by layer, and then performing construction recovery of the road structure layer.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The utility model provides a narrow and small space work well foundation pit quick supporting construction, includes: the device comprises a sleeve box, a surrounding purlin, a corner brace and a first lattice column; it is characterized in that the preparation method is characterized in that,
the sleeve box comprises four supporting plates which are sequentially connected, a first lattice column is arranged at an end corner inside the sleeve box and is vertically arranged, and the bottom of the first lattice column extends into the bottom of the foundation pit; enclose the purlin and be the rectangle structure, enclose the side and the backup pad internal surface connection of purlin, the end angle department of enclosing the purlin is provided with the gusset, and the both ends of gusset are connected respectively on the purlin that encloses of two adjacent backup pads.
2. The rapid supporting structure of a foundation pit of a narrow space working well according to claim 1, further comprising a second lattice column, wherein the second lattice column is arranged at a connecting position of the corner support and the surrounding purlin, the second lattice column is vertically arranged, and the bottom of the second lattice column extends into the bottom of the foundation pit.
3. The rapid supporting structure of a small space working well foundation pit according to claim 1, wherein the supporting plate is a rectangular steel plate.
4. A method for quickly supporting a narrow space working well foundation pit by using the structure for quickly supporting a narrow space working well foundation pit according to any one of claims 1 to 3, comprising the steps of:
s1, manufacturing a sleeve box, and welding a surrounding purlin and a corner brace in the sleeve box;
s2, hoisting the sleeve box into the foundation pit for fixing;
s3, mounting first lattice columns at four end corners of the sleeve box respectively, and driving the first lattice columns into the bottom of the foundation pit;
and S4, mounting a second lattice column at the end corner of the corner support, and driving the second lattice column into the bottom of the foundation pit to complete the support of the foundation pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466012.8A CN114673170A (en) | 2022-04-29 | 2022-04-29 | Rapid supporting structure and method for working well foundation pit in narrow space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210466012.8A CN114673170A (en) | 2022-04-29 | 2022-04-29 | Rapid supporting structure and method for working well foundation pit in narrow space |
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| Publication Number | Publication Date |
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| CN114673170A true CN114673170A (en) | 2022-06-28 |
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| CN202210466012.8A Pending CN114673170A (en) | 2022-04-29 | 2022-04-29 | Rapid supporting structure and method for working well foundation pit in narrow space |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131570A (en) * | 2014-06-26 | 2014-11-05 | 中冶天工上海十三冶建设有限公司 | Steel box enclosure device for foundation pit construction and construction method thereof |
| CN209652936U (en) * | 2018-11-28 | 2019-11-19 | 牛小犇 | A kind of artificial push pipe inspection shaft steel plate box pattern foundation pit supporting structure |
| US20200291597A1 (en) * | 2019-08-08 | 2020-09-17 | Infrastructure Renewal Institute of Southern China | Assembled recyclable rectangular working well with preset detachable door opening and construction method thereof |
| CN212077954U (en) * | 2020-03-25 | 2020-12-04 | 中国建筑第五工程局有限公司 | Portable assembled deep basal pit steel sheet case supporting construction that can have enough to meet need |
| CN212688967U (en) * | 2020-05-21 | 2021-03-12 | 甘肃中建市政工程勘察设计研究院有限公司 | Municipal administration small-size excavation supporting device |
| CN112878332A (en) * | 2020-10-11 | 2021-06-01 | 安徽中擎建设发展有限公司 | Basement elevator shaft sump construction structure and method thereof |
| CN213741115U (en) * | 2020-11-19 | 2021-07-20 | 西安镇青建筑工程有限公司 | Integrated structure of underground foundation and foundation pit supporting structure |
-
2022
- 2022-04-29 CN CN202210466012.8A patent/CN114673170A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131570A (en) * | 2014-06-26 | 2014-11-05 | 中冶天工上海十三冶建设有限公司 | Steel box enclosure device for foundation pit construction and construction method thereof |
| CN209652936U (en) * | 2018-11-28 | 2019-11-19 | 牛小犇 | A kind of artificial push pipe inspection shaft steel plate box pattern foundation pit supporting structure |
| US20200291597A1 (en) * | 2019-08-08 | 2020-09-17 | Infrastructure Renewal Institute of Southern China | Assembled recyclable rectangular working well with preset detachable door opening and construction method thereof |
| CN212077954U (en) * | 2020-03-25 | 2020-12-04 | 中国建筑第五工程局有限公司 | Portable assembled deep basal pit steel sheet case supporting construction that can have enough to meet need |
| CN212688967U (en) * | 2020-05-21 | 2021-03-12 | 甘肃中建市政工程勘察设计研究院有限公司 | Municipal administration small-size excavation supporting device |
| CN112878332A (en) * | 2020-10-11 | 2021-06-01 | 安徽中擎建设发展有限公司 | Basement elevator shaft sump construction structure and method thereof |
| CN213741115U (en) * | 2020-11-19 | 2021-07-20 | 西安镇青建筑工程有限公司 | Integrated structure of underground foundation and foundation pit supporting structure |
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