CN111705813A - Combined type inclined pile anchor rod foundation pit supporting system and supporting method - Google Patents
Combined type inclined pile anchor rod foundation pit supporting system and supporting method Download PDFInfo
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- CN111705813A CN111705813A CN202010720721.5A CN202010720721A CN111705813A CN 111705813 A CN111705813 A CN 111705813A CN 202010720721 A CN202010720721 A CN 202010720721A CN 111705813 A CN111705813 A CN 111705813A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000010276 construction Methods 0.000 claims abstract description 13
- 239000002689 soil Substances 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 abstract 1
- 238000004873 anchoring Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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- 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
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Abstract
The invention discloses a combined inclined pile anchor rod foundation pit supporting system and a supporting method, belonging to the technical field of foundation pit supporting, wherein the supporting system comprises the following supporting structures: combining the inclined and straight alternating piles with anchor rods; the monocline support piles are combined with anchor rods; the double-inclined supporting piles are combined with anchor rods. The combined supporting structure of the oblique and straight alternating piles and the anchor rods is characterized in that vertical supporting piles and supporting piles inclined towards the inner side or the outer side of a foundation pit are alternately arranged at the edge of the foundation pit and are connected through pile top crown beams to form row piles; one or more wales can be arranged on the outer tension surface of the vertical support pile, the anchor rods are arranged between the vertical piles, and the end parts of the anchor rods are fixed on the wales. The single-inclined supporting pile and anchor rod combined supporting structure is characterized in that a single row of piles inclined towards the inner side of a foundation pit are connected with anchor rods through crown beams or waist beams. The double-inclined supporting pile and anchor rod combined supporting structure is a supporting structure formed by connecting two rows of piles which are inclined towards the inner side and the outer side of a foundation pit respectively through crown beams and combining the piles with anchor rods. The support system adopts inclined piles and anchor rods for supporting, so that the pit bottom uplift phenomenon can be reduced, the lateral deformation of a foundation pit can be effectively controlled, the pile body bending moment can be reduced, the concrete volume and the reinforcing steel bar consumption of the support pile can be reduced, and the material cost can be reduced; vertical fender pile and stock are connected through the waist rail, do not occupy the interior construction space of foundation ditch, make full use of anchor power improves supporting construction antidumping ability, can be applicable to deeper foundation ditch.
Description
Technical Field
The invention belongs to the technical field of foundation pit supporting, and particularly relates to a combined inclined pile anchor rod foundation pit supporting system and a supporting method.
Background
In the foundation pit supporting engineering, the supporting forms of cantilever pile supporting, row pile and inner support combination and row pile and anchor rod combination are common, but the supporting forms have respective limitations. The cantilever pile has simple supporting construction and poor deformation control capability and can only be suitable for shallow foundation pits with better soil property; the combined supporting of the row piles and the inner supports can be used for a deep foundation pit, the supporting capability is strong, but the inner supports occupy a large construction area in the foundation pit, the later construction progress is influenced, and the overall cost is high; the pile anchor support has good stability and convenient earthwork excavation, but the reliability of a common anchor rod in the soft soil foundation pit engineering is low, and the condition of disturbance to the surrounding environment due to overlong anchor rod design also exists in the sandy soil and hard clay deep foundation pit engineering.
In recent years, a support form of inclined piles and inclined-straight alternate piles appears in foundation pit support engineering in soft soil areas, and the defects of the support form can be well overcome. However, the support depth of the single inclined pile or inclined-straight alternate pile is shallow, the deformation control capability is limited, and the popularization and application of the inclined pile support are restricted to a certain extent.
Disclosure of Invention
Aiming at the technical problems in the existing supporting mode, the invention provides a combined inclined pile anchor rod foundation pit supporting system and a supporting method, wherein the supporting system adopts inclined piles and anchor rods to carry out combined supporting, so that the pit bottom uplift phenomenon can be reduced, the lateral deformation of a foundation pit can be effectively controlled, the pile body bending moment can be reduced, the concrete volume and the reinforcement consumption of a supporting pile are reduced, and the material cost is reduced; the vertical support piles and the anchor rods are connected through the waist beams, so that the construction space in the foundation pit is not occupied, the anti-overturning capacity of the support structure is improved by fully utilizing the anchoring force, and the support structure is suitable for deeper foundation pits; the inclined pile end adopts a high-pressure rotary spraying process, so that the pile end resistance in soft soil can be improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a modular batter pile stock excavation supporting system which characterized in that has one or more of following several supporting construction:
(1) the combined supporting structure of the oblique and straight alternating piles and the anchor rods comprises the following two layouts;
firstly, the vertical support piles and the support piles inclined towards the interior of the foundation pit are alternately arranged at the edge of the foundation pit according to a certain proportion and are connected through pile top crown beams to form inclined-straight alternate pile rows; one or more wales can be arranged on the tensile surface at the outer side of the vertical support pile, the prestressed anchor rods are arranged among the vertical piles, and the end parts of the prestressed anchor rods are fixed on the wales;
secondly, the vertical support piles and the support piles inclined towards the outside of the foundation pit are alternately arranged at the edge of the foundation pit according to a certain proportion and are connected through pile top crown beams to form inclined-straight alternate piles; one or more wales can be arranged on the outer tension surface of the vertical support pile, the prestressed anchor rods are arranged between the vertical piles, and the end parts of the prestressed anchor rods are fixed on the wales.
(2) The single-inclined support pile and anchor rod combined support structure is composed of single-row piles inclined towards the inner side of a foundation pit and anchor rods, the anchor rods are arranged between adjacent inclined piles, and the anchor rods and the support piles are connected through crown beams or waist beams to form the support structure.
(3) The double-inclined supporting pile and anchor rod combined supporting structure comprises two rows of inclined supporting piles arranged along the edge of a foundation pit and anchor rods arranged at pile bodies or pile ends, wherein the two rows of inclined piles are respectively inclined towards the inside and the outside of the foundation pit and are alternately arranged according to a certain proportion, and pile tops are connected by crown beams; the waist rail is arranged on the outer tension surface of the inner inclined pile.
The vertical supporting piles and the inclined supporting piles can adopt cast-in-place piles or precast piles, and further can adopt stiff composite piles or pile ends are treated by high-pressure jet grouting piles; wherein, the inclined pile and the vertical direction included angle are within 10~30 degrees.
The pile body waist beam can be a concrete cast-in-place waist beam or a steel waist beam.
The anchor rod can be a common prestressed anchor rod, and further, a high-pressure jet grouting expansion head anchor rod or a recyclable expansion head anchor rod can be adopted; the anchor rod and the horizontal direction included angle is within 10~30 degrees.
Meanwhile, the invention also provides a supporting method in the foundation pit supporting system, which comprises the following steps:
(1) a supporting method for a foundation pit support combining inclined-straight alternate piles and anchor rods has two situations:
firstly, driving vertical supporting piles along the edge of a foundation pit, and driving the supporting piles inclined towards the inner side of the foundation pit between the adjacent vertical piles according to a certain proportion and a certain inclination angle; arranging crown beams on the pile tops of the vertical piles and the inclined piles to form an integral structure; constructing a prestressed anchor rod on a pile top crown beam according to design requirements; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the vertical pile, and constructing a prestressed anchor rod; and repeating the previous step until the soil body is excavated to the bottom of the pit, and reserving the soil body between the inclined and straight row piles below the designed elevation of the last anchor rod.
Secondly, driving vertical supporting piles along the edge of the foundation pit, and driving the supporting piles inclined towards the outer side of the foundation pit between the adjacent vertical piles according to a certain proportion and a certain inclination angle; arranging crown beams on the pile tops of the vertical piles and the inclined piles to form an integral structure; constructing a prestressed anchor rod on a pile top crown beam according to design requirements; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the vertical pile, and constructing a prestressed anchor rod; and repeating the previous step until the pit bottom is excavated.
(2) A supporting method of a monoclinic support pile and anchor rod combined foundation pit support comprises the following steps: driving a support pile inclined towards the inner side of the foundation pit along the edge of the foundation pit at a certain angle; arranging a crown beam on the pile top of the inclined pile to form an integral structure; constructing a prestressed anchor rod on a pile top crown beam according to design requirements; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the inner inclined pile, and constructing a prestressed anchor rod; and repeating the previous step until the pit bottom is excavated.
(3) A supporting method of a double-inclined supporting pile and anchor rod combined foundation pit support comprises the following steps: alternately driving inner inclined piles inclined at a certain angle towards the inner side of the foundation pit and outer inclined piles inclined at a certain angle towards the outer side of the foundation pit along the edge of the foundation pit according to a certain proportion; the top of the inner inclined pile and the top of the outer inclined pile are provided with crown beams to form an integral structure; constructing a prestressed anchor rod on a pile top crown beam according to design requirements; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the inner inclined pile, and constructing a prestressed anchor rod; and repeating the previous step until the pit bottom is excavated.
Compared with the prior art, the invention has the beneficial effects that:
(1) the support system can be better suitable for foundation pit engineering under different geological conditions by combining the inclined piles and the anchor rods, and the uplift resistance and the overturning resistance are improved;
(2) the inclined strut action of the inclined pile is combined with the anchoring action of the anchor rod, so that the pile body bending moment is reduced, the concrete volume and the reinforcement consumption of the support pile are reduced, the material cost is saved, and the overall construction cost is reduced;
(3) the construction is simple and convenient, and occupation of land space is little, makes things convenient for the interior construction operation of later stage foundation ditch, improves the efficiency of construction and saves the time limit for a project.
Drawings
Fig. 1 is a schematic diagram of a combined supporting structure layout I of oblique and straight alternating piles and anchor rods.
Fig. 2 is a schematic diagram of a second layout of the oblique-straight alternating pile and anchor rod combined supporting structure.
Fig. 3 is a schematic view of a single batter pile and anchor combined supporting structure.
Fig. 4 is a schematic view of a combined supporting structure of a double-inclined pile and a rock bolt.
In the figure: 1. the method comprises the following steps of (1) vertical supporting piles, 21. inner inclined supporting piles, 22. outer inclined supporting piles, 3. pile top crown beams, 4. pile body waist beams, 5. prestressed anchor rods and 6. soil retaining among inclined straight piles.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples, which are not intended to limit the invention in any way.
Example 1: a supporting structure of a foundation pit combining inclined-straight alternating piles and anchor rods and a supporting method thereof are disclosed, as shown in figure 1, the supporting structure comprises: the method comprises the following steps of vertical supporting piles 1, inner inclined supporting piles 21, pile top crown beams 3, pile body waist beams 4, jet grouting enlarged head anchor rods 5 and soil retaining 6 among inclined straight piles. The method for realizing the supporting structure comprises the following steps: driving vertical supporting piles 1 along the edge of the foundation pit, pressing prefabricated supporting piles 21 inclined towards the inner side of the foundation pit into the adjacent vertical piles according to a certain proportion and a certain inclination angle until the designed elevation of the pile bottom is reached; repeating the steps to form inclined-straight alternate row piles, and pouring concrete crown beams 3 on the pile tops of the vertical piles and the inclined piles to form an integral structure; constructing a prestressed anchor rod 5 on a pile top crown beam according to design requirements; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding steel waist beam or concrete waist beam 4 on a tension surface on the outer side of the vertical pile 1, and constructing a jet grouting enlarged footing anchor rod 5; and repeating the previous step until the designed elevation of the pit bottom is excavated, and reserving the soil body 6 between the inclined and straight row piles below the designed elevation of the last anchor rod.
Example 2: another kind of foundation pit supporting structure combining oblique and straight alternating piles and anchor rods and a supporting method thereof, as shown in fig. 2, the supporting structure includes: the device comprises a vertical supporting pile 1, an outer inclined supporting pile 22, a pile top crown beam 3, a pile body waist beam 4 and a jet grouting enlarged footing anchor rod 5. The method for realizing the supporting structure comprises the following steps: driving vertical supporting piles 1 along the edge of the foundation pit, and pressing prefabricated supporting piles 22 inclined towards the outer side of the foundation pit into the adjacent vertical piles according to a certain proportion and a certain inclination angle until the designed elevation of the pile bottom is reached; repeating the steps to form inclined-straight alternate row piles, and pouring concrete crown beams 3 on the pile tops of the vertical piles and the inclined piles to form an integral structure; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding steel waist beam or concrete waist beam 4 on a tension surface on the outer side of the vertical pile 1, and constructing a jet grouting enlarged footing anchor rod 5; and repeating the previous step until the pit bottom is excavated to the designed elevation.
Example 3: a monoclinic support pile and anchor rod combined foundation pit supporting structure and a supporting method thereof are disclosed, as shown in figure 3, the supporting structure comprises: the construction method comprises the following steps of inner inclined supporting piles 21, pile top crown beams 3, pile body waist beams 4 and jet grouting enlarged footing anchor rods 5. The method for realizing the supporting structure comprises the following steps: driving a prefabricated support pile 21 inclined towards the inner side of the foundation pit along the edge of the foundation pit at a certain angle; arranging a concrete crown beam 3 on the pile top of the inclined pile to form an integral structure; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding steel waist beam or concrete waist beam 4 on a tensile surface on the outer side of the inner inclined pile 21, and constructing a jet grouting enlarged footing anchor rod 5; and repeating the previous step until the pit bottom is excavated.
Example 4: as shown in fig. 4, the supporting structure comprises: the outer oblique supporting pile 22, the inner oblique supporting pile 21, the pile top crown beam 3, the pile body waist beam 4 and the jet grouting enlarged footing anchor rod 5. The method for realizing the supporting structure comprises the following steps: alternately driving inner inclined piles 21 inclined at a certain angle towards the inner side of the foundation pit and outer inclined piles 22 inclined at a certain angle towards the outer side of the foundation pit along the edge of the foundation pit according to a certain proportion until the designed elevation of the pile ends is reached, and forming alternately inclined row piles; concrete crown beams 3 are poured at the pile tops of the inner inclined piles 21 and the outer inclined piles 22 to form an integral structure; excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding steel waist beam or concrete waist beam 4 on a tension surface on the outer side of the inner inclined pile 21, and constructing a jet grouting enlarged footing anchor rod 5; and repeating the previous step until the pit bottom is excavated.
The above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and variations, modifications, additions and substitutions which may be made by those skilled in the art within the spirit of the present invention are within the scope of the present invention.
Claims (7)
1. The utility model provides a modular batter pile stock excavation supporting system which characterized in that has one or more of following several supporting construction: 1) the combined supporting structure of the oblique and straight alternating piles and the anchor rods comprises the following two layouts; firstly, the vertical support piles and the support piles inclined towards the interior of the foundation pit are alternately arranged at the edge of the foundation pit according to a certain proportion and are connected through pile top crown beams to form inclined-straight alternate pile rows; one or more wales can be arranged on the tensile surface at the outer side of the vertical support pile, the prestressed anchor rods are arranged among the vertical piles, and the end parts of the prestressed anchor rods are fixed on the wales; secondly, the vertical support piles and the support piles inclined towards the outside of the foundation pit are alternately arranged at the edge of the foundation pit according to a certain proportion and are connected through pile top crown beams to form inclined-straight alternate piles; one or more wales can be arranged on the tensile surface at the outer side of the vertical support pile, the prestressed anchor rods are arranged among the vertical piles, and the end parts of the prestressed anchor rods are fixed on the wales; 2) the single-inclined support pile and anchor rod combined support structure consists of single-row piles inclined towards the inner side of a foundation pit and anchor rods, the anchor rods are arranged between adjacent inclined piles, and the anchor rods and the support piles are connected through crown beams or waist beams to form a support structure; 3) the double-inclined supporting pile and anchor rod combined supporting structure comprises two rows of inclined supporting piles arranged along the edge of a foundation pit and anchor rods arranged at pile bodies or pile ends, wherein the two rows of inclined piles are respectively inclined towards the inside and the outside of the foundation pit and are alternately arranged according to a certain proportion, and pile tops are connected by crown beams; the waist rail is arranged on the outer tension surface of the inner inclined pile.
2. The combined inclined pile anchor rod foundation pit supporting system according to claim 1, wherein: the vertical supporting piles and the inclined supporting piles can adopt precast piles, cast-in-place piles or stiff composite piles, included angles between the inclined piles and the vertical direction are in the range of 10-30 degrees, and the end part entering the soil can be provided with a high-pressure jet grouting section to enhance end resistance.
3. The combined inclined pile anchor rod foundation pit supporting system according to claim 1, wherein: the pile body waist beam can be a concrete cast-in-place waist beam or a steel waist beam.
4. The combined inclined pile anchor rod foundation pit supporting system according to claim 1, wherein: the anchor rod can be ordinary anchor rod, high pressure jet grouting enlarged footing anchor rod or can retrieve enlarged footing anchor rod, and the anchor rod is 10~30 within range with the horizontal direction contained angle.
5. A supporting method for a foundation pit support combining inclined-straight alternate piles and anchor rods is characterized by comprising the following steps: 1) driving vertical support piles along the edge of the foundation pit, and driving inclined support piles between adjacent vertical piles according to a certain proportion and a certain inclination angle; 2) arranging crown beams on the pile tops of the vertical piles and the inclined piles to form an integral structure; 3) constructing a prestressed anchor rod on a pile top crown beam according to design requirements; 4) excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the vertical pile, and constructing a prestressed anchor rod; 5) and (5) repeating the step 4) until the inclined pile is an inner inclined pile when the pit bottom is excavated, and reserving soil mass between the inclined straight row piles below the designed elevation of the last anchor rod.
6. A supporting method of a monocline retaining pile and anchor rod combined foundation pit support is characterized by comprising the following steps: 1) driving a support pile inclined towards the inner side of the foundation pit along the edge of the foundation pit at a certain angle; 2) arranging a crown beam on the pile top of the inclined pile to form an integral structure; 3) constructing a prestressed anchor rod on a pile top crown beam according to design requirements; 4) excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the inner inclined pile, and constructing a prestressed anchor rod; 5) and repeating the step 4) until the pit bottom is excavated.
7. A supporting method of a double-inclined supporting pile and anchor rod combined foundation pit support is characterized by comprising the following steps: 1) alternately driving inner inclined piles inclined at a certain angle towards the inner side of the foundation pit and outer inclined piles inclined at a certain angle towards the outer side of the foundation pit along the edge of the foundation pit according to a certain proportion; 2) the top of the inner inclined pile and the top of the outer inclined pile are provided with crown beams to form an integral structure; 3) constructing a prestressed anchor rod on a pile top crown beam according to design requirements; 4) excavating a foundation pit to reach the designed elevation of a pile body anchor rod, constructing a corresponding waist beam on a tension surface on the outer side of the inner inclined pile, and constructing a prestressed anchor rod; 5) and repeating the step 4) until the pit bottom is excavated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010720721.5A CN111705813A (en) | 2020-07-24 | 2020-07-24 | Combined type inclined pile anchor rod foundation pit supporting system and supporting method |
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| CN202010720721.5A CN111705813A (en) | 2020-07-24 | 2020-07-24 | Combined type inclined pile anchor rod foundation pit supporting system and supporting method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112281638A (en) * | 2020-11-04 | 2021-01-29 | 武汉大学 | Two-stage reinforced earth abutment with closely-arranged ribs and construction method thereof |
| CN112323822A (en) * | 2020-11-30 | 2021-02-05 | 中国电建集团福建省电力勘测设计院有限公司 | Pipe gallery foundation pit with tension and compression support |
| CN112761168A (en) * | 2021-03-24 | 2021-05-07 | 无锡荣梁建设发展有限公司 | Foundation pit supporting device |
| CN112982432A (en) * | 2021-02-10 | 2021-06-18 | 建研地基基础工程有限责任公司 | Prestressed concrete foundation pit supporting structure and construction method |
| CN115233689A (en) * | 2022-07-04 | 2022-10-25 | 浙江工业大学 | Combined type enclosure structure for soft soil foundation pit and construction method thereof |
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| CN115233689A (en) * | 2022-07-04 | 2022-10-25 | 浙江工业大学 | Combined type enclosure structure for soft soil foundation pit and construction method thereof |
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