CN112252315A - Construction method for protecting static pressure steel casing of manual bored pile with water-bearing sand interlayer - Google Patents
Construction method for protecting static pressure steel casing of manual bored pile with water-bearing sand interlayer Download PDFInfo
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- CN112252315A CN112252315A CN202011219626.3A CN202011219626A CN112252315A CN 112252315 A CN112252315 A CN 112252315A CN 202011219626 A CN202011219626 A CN 202011219626A CN 112252315 A CN112252315 A CN 112252315A
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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
- E02D5/66—Mould-pipes or other moulds
- E02D5/68—Mould-pipes or other moulds for making bulkheads or elements thereof
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
- E02D7/20—Placing by pressure or pulling power
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a static pressure steel pile casing protection construction method for a manual hole digging pile in a water-containing sand layer, which belongs to the technical field of underground engineering construction, wherein during hole digging, a locking opening is poured at an orifice, a concrete retaining wall is poured for protection after a soil layer is dug downwards for a certain distance, then the concrete retaining wall is dug downwards until a water-containing sand interlayer is formed, the steel pile casing is adopted for protection, a jack is adopted for carrying out downward static pressure on the steel pile casing, the soil layer in the steel pile casing is not constructed in the static pressure process, and the operation is repeated until the required depth is reached; compared with the prior art, the concrete retaining wall protection and the steel retaining cylinder protection are flexibly applied to the construction of the manual hole digging and pile pouring foundation of the water-bearing sand interlayer soil layer, the construction period is greatly shortened, the waste of materials is avoided, the engineering quantity is smaller, no vibration and low noise are generated in the construction process, and the concrete retaining wall protection and the steel retaining cylinder protection are environment-friendly.
Description
Technical Field
The invention relates to the technical field of underground engineering construction, in particular to a static pressure steel casing protection construction method for a manual hole digging pile in a water-containing sand layer.
Background
In recent years, the mechanical hole forming of the pile foundation promoted by the nation plays a good promoting role in the aspects of reducing the occurrence of safety production accidents, improving the construction operation environment, improving the working efficiency and the like, embodies people-oriented reasons and accords with the development direction of construction science and technology. But under certain specific conditions, such as: the conditions for prohibiting manual hole digging and filling of the pile are immature due to complex geology, inconvenient traffic, restriction of surrounding environment and the like. When the situation that manual hole digging and pile filling are forced to be adopted and geological conditions are poor occurs in the field, the project progress is influenced certainly.
The water-bearing sand interlayer is a common unfavorable geological structure of a water area adjacent to the southwest area, and measures usually adopted by construction units mainly include reduction of hydrodynamic pressure and reduction of disturbance to a soil body. The former adopts well point dewatering, mud jacking and the like, has large engineering quantity and long construction period, and is very uneconomical when the engineering quantity of the pile foundation is small. The latter adopts the excavation cycle footage shortening, the steel casing setting and the like, the work load is relatively small, the construction period is relatively short, and the construction unit can easily accept the construction period.
Shortening the excavation depth of each cycle and reducing the normal 1 m-cycle to 0.5 m-cycle will increase the working period. By adopting the steel casing, if the common soil layer on the upper part of the water-bearing sand interlayer is thick, certain waste can be caused.
In conclusion, the applicant provides a static pressure steel casing protection construction method for a manual hole digging pile with a water-bearing sand interlayer.
Disclosure of Invention
In view of the problems of complex process, long construction period and material waste in the prior art, the technical scheme of the invention provides a static pressure steel casing protection construction method for a manual hole digging pile with a water-bearing sand interlayer, which solves the problems.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a static pressure steel casing protection construction method for a manual hole digging pile with a water-bearing sand interlayer comprises the following steps:
001. determining the position of an opening by utilizing the burial depth of the water-bearing sand interlayer determined in geological survey, and pouring a locking notch 1 by using concrete at the position of the opening;
002. digging holes downwards in a common soil layer in the locking opening in the step 001, and when the digging depth is 5m, ventilating the holes at intervals by using an air blower for 5-10 minutes and continuously ventilating when the depth is more than 10 m;
003. pouring concrete retaining walls in the 002 holes, wherein the concrete retaining walls are poured in a sectional manner;
004. stopping the operation when the distance between the concrete protecting wall and the water-bearing sand interlayer is 0.5m, forming a section steel mounting hole on the concrete protecting wall in the step 003, and placing a steel protecting cylinder after the hole is formed;
005. after the steel protection cylinder is placed, sequentially placing the section steel at the top of the steel protection cylinder, the jack and the reaction frame section steel, installing the reaction frame section steel into the section steel installation hole, and taking the section steel at the top of the steel protection cylinder and the reaction frame section steel as supporting points of the jack;
006. starting a jack to carry out downward static pressure on the steel casing, checking whether a concrete retaining wall has a crack or not in the static pressure process, and continuing the static pressure if no crack exists;
007. when a second section of steel casing is placed, a plurality of positioning steel bars are uniformly welded on the inner side of the bottom of the second section of steel casing, half of the positioning steel bars are welded in the second section of steel casing, and the second section of steel casing is aligned with the first section of steel casing and then is firmly welded;
008. repeating the 004-007 step until the water-bearing sand interlayer is penetrated, and then hollowing out the soil body in the steel casing;
009. after the soil body is hollowed, the reinforcement cage can be lifted into the soil body for placement, and pouring is carried out after placement is finished.
Through adopting the concrete dado to protect when the manual hole that digs in general soil layer, adopt the steel to protect a section of thick bamboo protection when the manual hole that digs in water-bearing sand intermediate layer, this two kinds of methods of flexible application are dug the hole and are irritated the pile foundation operation, the waste of a steel dado has been avoided, and do not reduce the degree of depth of circulating excavation, construction cycle is shorter, the engineering volume is littleer, great improvement the manual efficiency of digging the hole and irritating the pile foundation, the cost is saved, and do not have vibration trompil equipment, no vibration, the noise is little, green.
Further limiting, the number of the section steel mounting holes is two, and the depths of the two corresponding section steel mounting holes are different; one of them is for deepening the hole in two shaped steel mounting holes, and the degree of depth of the shaped steel mounting hole that corresponds sets up to inconsistent more convenient shaped steel's installation and tearing open and get.
Further limiting, the thickness of the concrete retaining wall is 100cm-200 cm; the thickness of the concrete retaining wall is made to be the size, so that better protection can be achieved.
Further limiting, the number of each layer of positioning steel bars is four, the length of each positioning steel bar is 30cm, and the diameter of each positioning steel bar is 16 mm; the steel bar with the size is used as a positioning steel bar, four steel protection cylinders are uniformly arranged on the inner side of each steel protection cylinder to match and position the two steel protection cylinders, and the steel protection cylinders are very stable.
Compared with the prior art, the concrete retaining wall protection and the steel retaining cylinder protection are flexibly applied to the construction of the manual hole digging and pile pouring foundation of the water-bearing sand interlayer soil layer, the construction period is greatly shortened, the waste of materials is avoided, the engineering quantity is smaller, no vibration and low noise are generated in the construction process, and the concrete retaining wall protection and the steel retaining cylinder protection are environment-friendly.
Drawings
FIG. 1 is a simple schematic diagram of the construction structure of the present invention;
fig. 2 is an enlarged schematic view of a portion a in fig. 1.
The corresponding labels in the figures are: 1-locking notch, 2-concrete retaining wall, 3-steel retaining cylinder, 4-steel retaining cylinder top section steel, 5-jack, 6-reaction frame section steel, 7-positioning steel bar, 8-general soil layer and 9-water-bearing sand interlayer.
Detailed Description
In order that those skilled in the art can better understand the technical solution of the present invention, the following embodiments are further described with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, a static pressure steel casing protection construction method for a manual bored pile with a water-bearing sand interlayer comprises the following steps:
001. determining the position of an opening by utilizing the burial depth of the water-bearing sand interlayer determined in geological survey, and pouring a locking notch 1 by using concrete at the position of the opening; through geological survey reports, the position of the open hole can be determined, the strength of the open hole, namely the section of the retaining wall concrete, is enhanced, and the concrete can bear the load in back pressure without being damaged.
002. Digging holes downwards in a common soil layer 8 in the locking notch 1 in the step 001, and when the digging depth is 5m, ventilating the holes at intervals by using an air blower for 5-10 minutes and continuously ventilating when the depth is more than 10 m;
003. pouring the concrete retaining wall 2 in the 002 holes, wherein the concrete retaining wall 2 is poured in a sectional manner;
004. stopping the operation when the distance between the section of the concrete retaining wall and the water-bearing sand interlayer 9 is 0.5m, forming section steel mounting holes in the second section of the concrete retaining wall 2 from bottom to top in the step 003, and putting the steel retaining cylinder 3 into the concrete retaining wall by using a crane after the hole is formed;
005. after the steel casing 3 is placed, sequentially placing the steel casing top section steel 4, the jack 5 and the reaction frame section steel 6, installing the reaction frame section steel 6 into the section steel installation hole, and taking the steel casing top section steel 4 and the reaction frame section steel 6 as supporting points of the jack 5;
006. the jack 5 is started to carry out downward static pressure on the steel casing 3, the static pressure is to avoid vibration compaction of a sand interlayer caused by vibration pressing, so that the steel casing is prevented from sinking, whether a crack exists in the concrete retaining wall 2 is checked in the static pressure process, if no crack exists, the static pressure can be continuously carried out, the soil of the steel casing 3 is not excavated in the static pressure process, the verticality of the steel casing 3 is observed at any time in the static pressure process, if the slope occurs, the adjustment is carried out in time, and the static pressure can be carried out until the next section of the steel casing 3 can be in place;
007. when the second section of steel casing 3 is placed, a plurality of positioning steel bars 7 are uniformly welded on the inner side of the bottom of the second section of steel casing 3, half of the positioning steel bars 7 are welded in the second section of steel casing 3, and the second section of steel casing 3 is aligned with the first section of steel casing 3 and then is welded firmly; the positioning steel bars 7 are convenient for accurate alignment of the axes of the two sections of the protective cylinders.
008. Repeating the steps of 004 and 007 until the water-bearing sand interlayer 9 is penetrated, and then hollowing out the soil body in the steel casing 3;
009. after the soil body is hollowed, the reinforcement cage can be lifted and placed, and pouring is carried out after placement is finished;
the section steel mounting holes are correspondingly two, the depths of the two corresponding section steel mounting holes are different, one of the two section steel mounting holes is a deep hole, and the length of the section steel is greater than the diameter of the pile foundation, so that the two ends of the section steel can be successfully fed into the two holes, and the depth of the deep hole is greater than the length of the section steel; the thickness of the concrete retaining wall 2 is 100cm-200 cm; the number of each layer of positioning steel bars 7 is four, the length of each layer of positioning steel bars 7 is 30cm, and the diameter of each layer of positioning steel bars 7 is 16 mm;
the concrete retaining wall 2 is adopted for protection when a common soil layer 8 is used for manual hole digging, and the steel retaining cylinder 3 is adopted for protection when a water-bearing sand interlayer 9 is used for manual hole digging, so that the hole digging and pile foundation grouting operation is flexibly carried out by using the two methods, the waste of the steel retaining cylinder 3 is avoided, the depth of circular excavation is not reduced, the construction period is shorter, the engineering quantity is smaller, the efficiency of the manual hole digging and pile foundation grouting is greatly improved, the cost is saved, no vibration and hole opening equipment is provided, the noise is low, and the environment is protected; the depth of the corresponding section steel mounting holes is set to be inconsistent, so that the section steel is more convenient to mount and dismount; the thickness of the concrete retaining wall 2 is made into the size, so that better protection can be realized; the steel bar with the size is used as the positioning steel bar 7, four steel protection cylinders 3 are uniformly arranged on the inner side of each steel protection cylinder 3 to match and position the two steel protection cylinders 3, and the steel protection cylinders are very stable.
The method is suitable for the construction of the pile foundation of the artificial hole digging and grouting of the unfavorable geological structure of the adjacent water area in the southwest region.
Compared with the prior art, the concrete retaining wall protection and the steel retaining cylinder protection are flexibly applied to the construction of the manual hole digging and pile pouring foundation of the water-bearing sand interlayer soil layer, the construction period is greatly shortened, the waste of materials is avoided, the engineering quantity is smaller, no vibration and low noise are generated in the construction process, and the concrete retaining wall protection and the steel retaining cylinder protection are environment-friendly.
The construction method for protecting the static pressure steel casing of the manual bored pile with the water-bearing sand interlayer provided by the invention is described in detail above, and the description of the specific embodiment is only used for helping to understand the method and the core idea of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (4)
1. A static pressure steel pile casing protection construction method for a manual hole digging pile with a water-bearing sand interlayer is characterized by comprising the following steps of: the method comprises the following steps:
001. determining the position of an opening by utilizing the burial depth of the water-bearing sand interlayer determined in geological survey, and pouring a locking notch 1 by using concrete at the position of the opening;
002. digging holes downwards in a common soil layer in the locking opening in the step 001, and when the digging depth is 5m, ventilating the holes at intervals by using an air blower for 5-10 minutes and continuously ventilating when the depth is more than 10 m;
003. pouring concrete retaining walls in the 002 holes, wherein the concrete retaining walls are poured in a sectional manner;
004. stopping the operation when the distance between the concrete protecting wall and the water-bearing sand interlayer is 0.5m, forming a section steel mounting hole on the concrete protecting wall in the step 003, and placing a steel protecting cylinder after the hole is formed;
005. after the steel protection cylinder is placed, sequentially placing the section steel at the top of the steel protection cylinder, the jack and the reaction frame section steel, installing the reaction frame section steel into the section steel installation hole, and taking the section steel at the top of the steel protection cylinder and the reaction frame section steel as supporting points of the jack;
006. starting a jack to carry out downward static pressure on the steel casing, checking whether a concrete retaining wall has a crack or not in the static pressure process, and continuing the static pressure if no crack exists;
007. when a second section of steel casing is placed, a plurality of positioning steel bars are uniformly welded on the inner side of the bottom of the second section of steel casing, half of the positioning steel bars are welded in the second section of steel casing, and the second section of steel casing is aligned with the first section of steel casing and then is firmly welded;
008. repeating the 004-007 step until the water-bearing sand interlayer is penetrated, and then hollowing out the soil body in the steel casing;
009. after the soil body is hollowed, the reinforcement cage can be lifted into the soil body for placement, and pouring is carried out after placement is finished.
2. The construction method for protecting the static pressure steel casing of the manual bored pile with the water-bearing sand interlayer according to claim 1, characterized in that: the shaped steel mounting hole is two for corresponding, and one of them is the deepening hole in two shaped steel mounting holes.
3. The construction method for protecting the static pressure steel casing of the manual bored pile with the water-bearing sand interlayer according to claim 1, characterized in that: the thickness of the concrete retaining wall is 100cm-200 cm.
4. The construction method for protecting the static pressure steel casing of the manual bored pile with the water-bearing sand interlayer according to claim 1, characterized in that: the number of each layer of positioning steel bars is four, the length of each layer of positioning steel bars is 30cm, and the diameter of each layer of positioning steel bars is 16 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011219626.3A CN112252315A (en) | 2020-11-04 | 2020-11-04 | Construction method for protecting static pressure steel casing of manual bored pile with water-bearing sand interlayer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011219626.3A CN112252315A (en) | 2020-11-04 | 2020-11-04 | Construction method for protecting static pressure steel casing of manual bored pile with water-bearing sand interlayer |
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| CN112252315A true CN112252315A (en) | 2021-01-22 |
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| CN202011219626.3A Pending CN112252315A (en) | 2020-11-04 | 2020-11-04 | Construction method for protecting static pressure steel casing of manual bored pile with water-bearing sand interlayer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002915A (en) * | 2015-07-21 | 2015-10-28 | 中厦建设集团有限公司 | Construction method of steel casing guard wall of manual hole digging pile |
| CN107083771A (en) * | 2017-06-15 | 2017-08-22 | 中铁六局集团天津铁路建设有限公司 | A kind of drilling construction method of artificial digging pile |
-
2020
- 2020-11-04 CN CN202011219626.3A patent/CN112252315A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105002915A (en) * | 2015-07-21 | 2015-10-28 | 中厦建设集团有限公司 | Construction method of steel casing guard wall of manual hole digging pile |
| CN107083771A (en) * | 2017-06-15 | 2017-08-22 | 中铁六局集团天津铁路建设有限公司 | A kind of drilling construction method of artificial digging pile |
Non-Patent Citations (1)
| Title |
|---|
| 《地基处理手册》（第二版）编写委员会: "《地基处理手册（第二版）》", 31 March 2001, 中国建筑工业出版社 * |
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