CN111350193A - Open type foundation pit supporting method - Google Patents
Open type foundation pit supporting method Download PDFInfo
- Publication number
- CN111350193A CN111350193A CN201811571009.2A CN201811571009A CN111350193A CN 111350193 A CN111350193 A CN 111350193A CN 201811571009 A CN201811571009 A CN 201811571009A CN 111350193 A CN111350193 A CN 111350193A
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- Prior art keywords
- foundation pit
- steel
- pile
- waist beam
- anchor
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 238000004873 anchoring Methods 0.000 claims abstract description 11
- 239000002689 soil Substances 0.000 claims abstract description 7
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000013461 design Methods 0.000 claims abstract description 3
- 238000009434 installation Methods 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 27
- 238000009412 basement excavation Methods 0.000 description 5
- 238000005553 drilling Methods 0.000 description 3
- 238000009933 burial Methods 0.000 description 2
- 238000012369 In process control Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010965 in-process control Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003405 preventing effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/226—Protecting piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
An open foundation pit supporting method includes the following steps of ① positioning and paying off and digging a foundation pit, ② arranging supporting piles linearly along the edge of the foundation pit and driving the supporting piles into the soil body in a positive-negative mutual engagement mode, ③ cutting holes below the pile top of each supporting pile to form a hole channel with a certain angle with the horizontal plane, penetrating prestressed steel strands after hole forming is completed, ④ performing grouting on the lower portions of the prestressed steel strands to form anchoring sections, ⑤ installing steel waist beams and anchors, wherein the steel waist beams are installed on the inner sides of the supporting piles to enable the supporting piles to be connected into a whole, anchor heads of anchor cables penetrate through the steel waist beams, then the anchors are installed on the anchor heads, and when the strength of the anchoring sections of the foundation pit ⑤ reaches the design strength, the prestressed steel strands are tensioned and locked.
Description
Technical Field
The invention belongs to the field of foundation pit engineering construction, and particularly relates to an open type foundation pit supporting method.
Background
With the development of national economy, the number of constructions is increased, and the reconstruction tasks of the original old factory areas and the old city areas are further increased when new factory areas and new city areas are developed in some large and medium cities. In the transformation process of old factory areas and old urban areas, various influences can be generated on newly-built buildings inevitably by original buildings, especially when the soil quality of the foundation of adjacent buildings is poor, the foundation burial depth is inconsistent and the slope cannot be normally set to meet the safety requirement, in order to ensure that the safety of the original buildings is not influenced, before the foundation of the new building is excavated, the foundation protection treatment needs to be carried out on the original buildings, so that the limitation of a construction site can be avoided, and particularly, the construction of a deep foundation is more prominent.
The traditional construction method, whether the pile is a cast-in-place pile support or a pile support of the SMW construction method, has high construction cost and long construction period, and has relatively complex construction process. And the supporting form of the steel sheet pile and the inner support is difficult to excavate earthwork, the interference on the construction of a concrete structure is large, and the construction quality is inconvenient to control.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an open type foundation pit supporting method which is particularly suitable for the construction of underground foundation pits in narrow spaces, wherein the underground foundation pits are close to new and old buildings and cannot be normally set on slopes, and the method is simple and convenient to construct, high in construction efficiency and low in construction cost.
As conceived above, the technical scheme of the invention is as follows: an open foundation pit supporting method is characterized in that: the method comprises the following steps:
① positioning, paying off, and digging foundation pit;
② the support piles are linearly arranged along the side of the foundation pit and driven into the soil body, and a positive pile and a negative pile are mutually engaged;
③ cutting below the top of each support pile to form a hole at a certain angle with the horizontal plane, and penetrating prestressed steel strand after hole formation;
④ grouting the lower part of the prestressed steel strand by a grouting pump to form an anchoring section;
⑤ installing a steel waist beam and an anchorage device, wherein the steel waist beam is installed on the inner side of the support pile, the support pile is connected into a whole by the steel waist beam, the installation height of the steel waist beam is consistent with the installation height of the anchor cable on the upper part of the prestressed steel strand, the steel waist beam penetrates through the anchor head of the anchor cable, and the anchorage device is installed on the anchor head;
⑤ when the strength of the anchoring section reaches the design strength, the prestressed steel strand is tensioned and locked, and then a foundation pit supporting system is formed.
The support piles are Larsen steel sheet piles.
The steel waist beam is manufactured by channel steel, holes are formed in the steel waist beam in advance, and the positions of the holes are consistent with those of the support piles.
In step ⑤, the anchor lines are at a certain angle to the horizontal plane, and two anchor lines are separated by two support piles.
The invention has the beneficial effects that:
1. the invention can be used for foundation pit engineering construction with poor foundation soil quality of adjacent buildings, inconsistent foundation burial depth and incapability of normally putting slopes, and has good water stopping and preventing effects.
2. The support pile can be used in a turnover mode, and construction cost is saved.
3. The support system formed by the invention improves the integral stability of the foundation pit, and simultaneously the prestressed anchor cable effectively controls the deformation of the foundation pit, thereby further improving the stability and the safety of the foundation pit.
4. The invention replaces the inner support with the prestressed anchor cable, provides an open construction environment for foundation construction, has little influence on the surrounding environment and greatly saves the construction period.
Description of the drawings:
FIG. 1 is a schematic view of the present invention.
In the figure: 1 is an existing building (structure); 2 is a steel waist beam; 3 is an anchorage device; 4 Larsen steel sheet piles; 5, an anchor cable anchoring section; 6 anchor cable non-anchoring section.
Detailed Description
The present invention will be further described by way of examples of specific engineering, which are illustrative and not limiting, and the scope of the present invention is not limited thereto.
As shown in the figure: an open foundation pit supporting method comprises the following steps:
1. positioning and paying off and digging a foundation pit: and positioning and paying off are carried out by a measurer according to the position of the steel sheet pile of the foundation pit, then the foundation pit is excavated along the line by adopting a backhoe, and the excavation is carried out to a certain range below the top of the supporting pile.
2. Constructing a support pile-Larsen steel sheet pile: according to the foundation ditch sideline, draw the control line, be linear along the foundation ditch limit and beat Larsen steel sheet pile from one end to the other end and establish, adopt crawler-type pile driver to execute and beat, interlock is carried out just one conversely, pile in-process control pile bolck elevation and the straightness that hangs down of stake.
3. Excavating a foundation pit for the first time: the operation plane of the steel anchor supporting structure is excavated by using the backhoe excavator, the earthwork of the foundation pit is excavated to a certain range below the waist beam position, and drilling and anchor cable construction can be met.
4. Hole location and hole opening: and determining the position of the opening in a certain range below the pile top of the Larsen steel plate pile, and cutting and forming the opening on the Larsen steel plate pile by adopting gas welding, wherein the diameter of the opening is larger than that of the drill rod.
5. Drilling: the hole forming machine is adopted to drill a hole channel at a certain angle with the horizontal line, the angle is controlled during drilling, and dry operation or wet operation is selected according to soil quality.
6. After the hole is formed to the designed depth, a prestressed steel strand is penetrated along the pore channel, the upper part of the prestressed steel strand is penetrated into the conical anchor shoe, the end head is locked and confined by a steel hoop, and the conical anchor shoe is conveyed to the bottom of the hole by a drill rod.
7. Grouting: grouting the lower part of the prestressed steel strand by using a grouting pump to form an anchoring section: and grouting at the anchoring section is performed twice, cement mortar is poured for the first time, the grouting is performed after the initial setting of the first grouting for the second time, pure cement slurry is injected under pressure, and the grouting pressure is controlled during grouting and is generally not more than 2 times of the pressure of covering soil on the hole.
8. Installing a steel waist beam and an anchorage device:
and horizontally arranging channel steel on the inner side of the Larsen steel sheet pile to serve as a steel waist beam, prefabricating holes in the steel waist beam, keeping the hole positions consistent with the hole positions on the Larsen steel sheet pile, keeping the installation height of the steel waist beam consistent with the installation height of the anchor cable, and connecting the steel waist beam with the steel sheet pile to form a whole.
Mounting an anchorage device, namely penetrating an anchor head of an anchor cable through the steel waist beam, and mounting the anchorage device on the anchor head; the anchor cables and the horizontal plane form a certain angle, and the two anchor cables are separated by 2 steel sheet piles.
9. Pre-stress tension:
when the strength of the anchoring body reaches the designed strength, prestress tensioning is carried out, and generally a spacing type tensioning mode is adopted for binding and pulling. And tensioning the anchor cable by using tensioning equipment, and locking and fixing the anchor cable by using an anchorage device after tensioning is finished.
10. Secondary excavation of the foundation pit:
after the construction of the steel anchor support system is finished and the acceptance is passed, the secondary excavation of the foundation pit is started; before excavation, arranging a plurality of displacement observation points and settlement observation points on a supporting pile top and a foundation pit slope; a back-hoe excavator is adopted to excavate to the designed elevation of the bottom of the foundation pit, and in the excavation process, special measuring personnel make foundation pit monitoring records.
The invention is suitable for the foundation pit supporting method with limited site and continuous construction operation of underground foundation, and can meet the requirement of open construction of underground engineering. The invention has the characteristics of simple and convenient operation, high construction safety, high construction quality, short construction period and low construction cost.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. An open foundation pit supporting method is characterized in that: the method comprises the following steps:
① positioning, paying off, and digging foundation pit;
② the support piles are linearly arranged along the side of the foundation pit and driven into the soil body, and a positive pile and a negative pile are mutually engaged;
③ cutting below the top of each support pile to form a hole at a certain angle with the horizontal plane, and penetrating prestressed steel strand after hole formation;
④ grouting the lower part of the prestressed steel strand by a grouting pump to form an anchoring section;
⑤ installing a steel waist beam and an anchorage device, wherein the steel waist beam is installed on the inner side of the support pile, the support pile is connected into a whole by the steel waist beam, the installation height of the steel waist beam is consistent with the installation height of the anchor cable on the upper part of the prestressed steel strand, the steel waist beam penetrates through the anchor head of the anchor cable, and the anchorage device is installed on the anchor head;
⑤ when the strength of the anchoring section reaches the design strength, the prestressed steel strand is tensioned and locked, and then a foundation pit supporting system is formed.
2. An open foundation pit supporting method according to claim 1, wherein: the support piles are Larsen steel sheet piles.
3. An open foundation pit supporting method according to claim 1, wherein: the steel waist beam is manufactured by channel steel, holes are formed in the steel waist beam in advance, and the positions of the holes are consistent with those of the support piles.
4. The method of claim 1, wherein in step ⑤ the anchor lines are at an angle to the horizontal and the two anchor lines are separated by two support piles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811571009.2A CN111350193A (en) | 2018-12-21 | 2018-12-21 | Open type foundation pit supporting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811571009.2A CN111350193A (en) | 2018-12-21 | 2018-12-21 | Open type foundation pit supporting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111350193A true CN111350193A (en) | 2020-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811571009.2A Pending CN111350193A (en) | 2018-12-21 | 2018-12-21 | Open type foundation pit supporting method |
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| Country | Link |
|---|---|
| CN (1) | CN111350193A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111794247A (en) * | 2020-07-28 | 2020-10-20 | 广东万信建设工程科技有限公司 | Foundation pit supporting structure and construction method thereof |
| CN113235592A (en) * | 2021-04-21 | 2021-08-10 | 海洋石油工程股份有限公司 | Temporary steel sheet pile ground anchor system and construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1277293A (en) * | 2000-07-07 | 2000-12-20 | 蔡昌斌 | Support structure and construction process of foundation pit |
| CN1563605A (en) * | 2004-03-23 | 2005-01-12 | 孙学毅 | Constructing method for controlling deformation on ground excavated |
| CN102493459A (en) * | 2011-11-24 | 2012-06-13 | 天津二十冶建设有限公司 | Building isolation support construction method for constructing deep foundation in narrow environment |
| CN102828518A (en) * | 2012-09-17 | 2012-12-19 | 中国建筑第二工程局有限公司 | Prestressed anchor cable anchoring structure of manual hole digging support pile and construction method thereof |
| CN106320346A (en) * | 2016-08-24 | 2017-01-11 | 陕西建工第六建设集团有限公司 | Construction method for supporting deep foundation pit through grouting after pile arrangement and anchor cable mounting |
-
2018
- 2018-12-21 CN CN201811571009.2A patent/CN111350193A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1277293A (en) * | 2000-07-07 | 2000-12-20 | 蔡昌斌 | Support structure and construction process of foundation pit |
| CN1563605A (en) * | 2004-03-23 | 2005-01-12 | 孙学毅 | Constructing method for controlling deformation on ground excavated |
| CN102493459A (en) * | 2011-11-24 | 2012-06-13 | 天津二十冶建设有限公司 | Building isolation support construction method for constructing deep foundation in narrow environment |
| CN102828518A (en) * | 2012-09-17 | 2012-12-19 | 中国建筑第二工程局有限公司 | Prestressed anchor cable anchoring structure of manual hole digging support pile and construction method thereof |
| CN106320346A (en) * | 2016-08-24 | 2017-01-11 | 陕西建工第六建设集团有限公司 | Construction method for supporting deep foundation pit through grouting after pile arrangement and anchor cable mounting |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111794247A (en) * | 2020-07-28 | 2020-10-20 | 广东万信建设工程科技有限公司 | Foundation pit supporting structure and construction method thereof |
| CN113235592A (en) * | 2021-04-21 | 2021-08-10 | 海洋石油工程股份有限公司 | Temporary steel sheet pile ground anchor system and construction method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20200630 |