CN114232612A - Cast-in-situ bored pile construction method for avoiding empty pile backfilling - Google Patents
Cast-in-situ bored pile construction method for avoiding empty pile backfilling Download PDFInfo
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- CN114232612A CN114232612A CN202111613202.XA CN202111613202A CN114232612A CN 114232612 A CN114232612 A CN 114232612A CN 202111613202 A CN202111613202 A CN 202111613202A CN 114232612 A CN114232612 A CN 114232612A
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000011065 in-situ storage Methods 0.000 title claims description 19
- 229910000831 Steel Inorganic materials 0.000 claims description 47
- 239000010959 steel Substances 0.000 claims description 47
- 238000005553 drilling Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 23
- 238000004140 cleaning Methods 0.000 claims description 13
- 239000013049 sediment Substances 0.000 claims description 8
- 230000005484 gravity Effects 0.000 claims description 3
- 239000002699 waste material Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
-
- 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
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of civil engineering, and discloses a construction method of a bored pile for avoiding empty pile backfilling.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a cast-in-situ bored pile construction method for avoiding empty pile backfilling.
Background
At present, the utilization of urban underground space in China enters a rapid development period, and the construction of urban underground engineering steps into a peak period. In the excavation process, the implementation conditions of underground hydrology, geology, underground space span, surrounding buildings and the like are considered, and the conditions of the buried depth of underground engineering and the like are considered, the cast-in-situ bored pile construction method is frequently used, and the cast-in-situ bored pile construction method can control the span of the enclosure support structure and improve the anti-floating capacity of the engineering.
In order to avoid the risk of forming a hole at the bottom of the foundation pit after excavation of the foundation pit, the hole is usually formed by forming the hole on the ground and pouring the hole into the bottom of the foundation pit, and the hole is formed by forming a hollow pile from the bottom of the foundation pit to the ground, so that the risk is brought to construction. Therefore, the traditional method is as follows: the method has the disadvantages that after hole forming, backfilling is carried out firstly, and then excavation is carried out repeatedly, and the investment waste is large, and the waste can be caused to sandstone materials which are in short supply in the current main city.
Disclosure of Invention
The purpose of the invention is: the cast-in-situ bored pile construction method capable of avoiding empty pile backfilling is provided, so that the field work efficiency is improved, and the waste of gravel materials is reduced.
In order to achieve the purpose, the invention provides a cast-in-situ bored pile construction method for avoiding empty pile backfilling, which comprises the following steps:
step S1, leveling the field and cleaning sundries in the field;
step S2, positioning the center of the pile hole;
step S3, pre-burying a cylindrical steel casing with the diameter of a, wherein the center of the cylindrical steel casing is superposed with the center of the pile hole;
step S4, drilling holes along the inside of the cylindrical steel casing by a drilling machine to obtain pile holes;
step S5, placing a drill bit of the drilling machine into the pile hole bottom to sweep the hole, and fishing out sediments;
step S6, pouring concrete into the pile hole;
step S7, arranging a circular baffle plate with the diameter of b at the upper end of the cylindrical steel casing, wherein the circular baffle plate is plugged in the opening of the pile hole, and b is larger than a;
and step S8, excavating the site near the pile hole, wherein the cylindrical steel casing and the circular baffle plate are always sealed at the opening of the pile hole by utilizing the self gravity in the excavating process.
Optionally, the positioning of the center position of the pile hole includes: and measuring the central position of the positioning pile hole by adopting a total station, a theodolite and a level gauge.
Optionally, in step S6, pouring underwater concrete by using a conduit method, hanging the prefabricated steel bar in the pile hole, controlling the buried depth of the conduit to be 2-4 m, controlling the distance between the bottom of the pipe and the bottom of the hole to be 300-500 mm after the conduit enters the hole, and pouring concrete into the pile hole by using the conduit.
Optionally, in step S7, a through hole is formed in the center of the circular baffle, a positioning rod penetrates through the through hole, the bottom of the positioning rod extends into the concrete, and a positioning flag is disposed at the top of the positioning rod.
Optionally, the positioning rod is perpendicular to the circular baffle.
Optionally, in step S3, the height of the cylindrical steel casing is greater than or equal to 1.0m, and an upper end opening of the cylindrical steel casing is flush with the ground.
Optionally, the step S8 further includes, after excavating the ground near the pile hole, taking away the circular baffle and the cylindrical steel casing, and backfilling the pile hole.
Optionally, in step S5, before pouring the concrete, secondary hole cleaning is performed, and the sediment is removed again.
Optionally, the step S5 further includes: after the secondary hole cleaning, the hole is detected by using an ultrasonic hole detector.
Compared with the prior art, the cast-in-situ bored pile construction method capable of avoiding empty pile backfilling has the beneficial effects that:
the method for plugging the pile hole in the embodiment of the invention utilizes the existing cylindrical steel pile casing when drilling the hole, the circular baffle plate with the diameter larger than that of the cylindrical steel pile casing is welded at the opening at the upper end of the cylindrical steel pile casing, the circular baffle plate is plugged at the opening of the pile hole by utilizing the self-weight, the aim of sealing the pile hole can be achieved, the empty pile does not need to be backfilled, and in the process of digging soil, the cylindrical steel pile casing and the circular baffle plate utilize the self-weight to seal the pile hole in real time, so that the investment is reduced, the field work efficiency is improved, the material waste is reduced, and the effects of saving social resources, improving the social production efficiency, reducing the cost of construction units and improving the work efficiency of construction units are achieved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure, 1, a circular baffle; 2. a cylindrical steel casing; 3. positioning a rod; 4. positioning a flag; 5. pile holes; 6. a ground surface; 7. pile compaction; 8. and (6) foundation pit.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
First, it should be noted that the orientations of top, bottom, upward, downward, and the like referred to herein are defined with respect to the orientation in the respective drawings, are relative concepts, and thus can be changed according to different positions and different practical states in which they are located. These and other orientations, therefore, should not be used in a limiting sense.
It should be noted that the term "comprising" does not exclude other elements or steps and the "a" or "an" does not exclude a plurality.
Furthermore, it should be further noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the figures, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present application not directly mentioned herein.
It will be further understood that the terms "first," "second," and the like, are used herein to describe various information and should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present application.
It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.
As shown in fig. 1, a method for constructing a cast-in-situ bored pile to avoid empty pile backfill according to a preferred embodiment of the present invention includes the following steps:
and step S1, flattening, reinforcing and the like of the construction site, cleaning sundries in the site, ensuring that the construction site has enough bearing capacity to prevent the drilling machine from inclining, and simultaneously ensuring that the maximum inclination angle between the drilling machine and the horizontal plane is not more than 4 degrees.
And step S2, positioning the center position of the pile hole 5.
The specific construction process of step S2 is: and marking the center position of the pile hole 5 by adopting a cross positioning method. And (3) setting out the pile hole 5 by adopting a total station, a theodolite and a level gauge to measure and position. And (3) setting H/300 construction error allowance of pile position coordinates to reserve pile position deviation and verticality deviation during construction, wherein H is the depth of the foundation pit 8.
And S3, pre-burying the cylindrical steel casing 2 with the diameter a, wherein the center of the cylindrical steel casing 2 is superposed with the center of the pile hole 5, and the cylindrical steel casing 2 prevents the wall of the pile hole 5 from collapsing. Wherein, the cylindrical steel casing 2 is required to be firm and durable and has no water leakage.
The specific construction process of step S3 is: the height of the cylindrical steel pile casing 2 is more than or equal to 1.0m, the upper end opening of the cylindrical steel pile casing 2 is flush with the ground 6, and the center deviation between the cylindrical steel pile casing 2 and the pile hole 5 cannot be more than 20 mm.
And S4, drilling holes along the inside of the cylindrical steel casing 2 by using a drilling machine, constructing a pile foundation in a soil layer, a sand layer and a pebble layer in the cylindrical steel casing 2 by using a rotary drill, injecting slurry for wall protection while drilling, checking the state of the drilling machine constantly during the drilling process, if the drilling machine is inclined, adjusting the position of the drilling machine and then drilling, and ensuring that the deviation of the hole position of a pile hole is not more than 5cm during the drilling process.
And step S5, placing a drill bit of the drilling machine into the bottom of the pile hole 5 to sweep the hole and removing sediments, wherein the hole cleaning adopts a positive circulation rotary drilling machine to clean the hole, and further, sludge and sediments at the bottom of the pile hole 5 are cleaned.
And step S6, pouring concrete into the pile hole 5. Specifically, the underwater concrete is poured by a guide pipe method, prefabricated steel bars are hung in a pile hole 5 by a crane, the buried depth of the guide pipe is 2-4 m, the guide pipe is hung in the pile hole by the crane, slurry is pressed into the guide pipe by a water pump, and the concrete is poured into the pile hole 5 by the guide pipe. The time for installing the steel bars and the guide pipes is long, new sediments are generated in the pile holes 5, secondary hole cleaning needs to be carried out before concrete pouring, the sediments are fished out again, after the steel bars and the guide pipes are in place, a positive circulation rotary drilling machine is adopted for secondary hole cleaning so as to achieve the purpose of secondary hole cleaning, after hole cleaning is completed, concrete is immediately poured into the pile holes 5 through the guide pipes, so that solid piles 7 are formed at the bottom of the foundation pit 8, and empty piles are formed on the top of the bottom of the foundation pit 8.
Furthermore, after secondary hole cleaning is carried out, an ultrasonic hole inspection instrument is required to be used for detecting the hole, and the detection is qualified, namely the completion of the hole forming process is represented, and the next construction process can be carried out.
Step S7, after concrete is poured, welding a circular baffle 1 with the diameter of b at the upper end of the cylindrical steel casing 2, and sealing the opening of the pile hole 5 by the circular baffle 1, wherein b is larger than a, so that the circular baffle 1 can be supported on the ground surface to prevent workers from falling into the hollow pile from the pile hole 5, and simultaneously avoiding the situation that the hollow pile is backfilled to ensure the safety of constructors and then repeatedly excavated to cause material waste, step S7 directly seals the opening of the pile hole 5 by the cylindrical steel casing 2 used in the drilling process, namely, the cylindrical steel casing 2 which needs to be discarded originally is repeatedly utilized, and meanwhile, the backfilling of the hollow pile is avoided again, so that the repeated utilization of the cylindrical steel casing 2 is realized, and the production cost is reduced.
In the step S7, a through hole is formed in the center of the circular baffle 1, the positioning rod 3 penetrates through the through hole, the bottom of the positioning rod 3 extends into the concrete, the positioning flag 4 is arranged at the top of the positioning rod 3, the positioning rod 3 can prevent the circular baffle 1 from shifting, the circular baffle 1 is enabled to always cover the upper opening of the empty pile, and the setting of the positioning flag 4 can play a role in warning for workers. And, the locating lever 3 sets up with circular baffle 1 looks vertical, and the setting of locating lever 3 can play and dig the place near stake hole 5 and provide the height reference.
The positioning rod 3 is supported by a multi-section lap joint mode, namely a plurality of straight rods are clamped by a convex block and a groove.
And S8, excavating the field near the pile hole 5, wherein in the excavating process, the cylindrical steel casing 2 and the circular baffle 1 rotate and sink by utilizing the self gravity to enable the cylindrical steel casing to be always plugged in the opening of the pile hole 5, wherein in the excavating process, when the positioning rod 3 is exposed out of the ground 6 of the field, the straight rod end of the positioning rod 3 exposed out of the ground 6 can be disassembled until the excavating is finished, and the positioning rod 3, the circular baffle 1 and the cylindrical steel casing 2 are disassembled.
Compared with the prior art, the cast-in-situ bored pile construction method for avoiding empty pile backfilling provided by the embodiment of the invention has the following beneficial effects:
this application has utilized pre-buried cylinder steel to protect a section of thick bamboo 2 and carry out the shutoff to 5 openings in stake hole before creeping into the pore-forming, and then need not backfill and the repeated excavation again to stake hole 5, so overcome the shortcoming of traditional way (backfill earlier, the repeated excavation again, cause investment and material waste). The method for plugging the pile hole 5 comprises the steps of utilizing the existing cylindrical steel pile casing 2 during drilling hole forming, welding a circular baffle with the diameter larger than that of the cylindrical steel pile casing 2 at the upper end opening of the cylindrical steel pile casing 2, forming a hole at the circle center of the circular baffle, plugging the opening of the pile hole by the circular baffle through self weight, achieving the purpose of sealing the pile hole 5, not refilling empty piles, and in the process of digging soil, sliding the cylindrical steel pile casing 2 and the circular baffle 1 along a positioning rod through self weight to seal the pile hole 5 in real time, so that investment is reduced, the field work efficiency is improved, material waste is reduced, social resources can be saved, the social production efficiency is improved, the cost of construction units is reduced, and the work efficiency of construction units is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. A cast-in-situ bored pile construction method for avoiding empty pile backfilling is characterized by comprising the following steps:
step S1, leveling the field and cleaning sundries in the field;
step S2, positioning the center of the pile hole;
step S3, pre-burying a cylindrical steel casing with the diameter of a, wherein the center of the cylindrical steel casing is superposed with the center of the pile hole;
step S4, drilling holes along the inside of the cylindrical steel casing by a drilling machine to obtain pile holes;
step S5, placing a drill bit of the drilling machine into the pile hole bottom to sweep the hole, and fishing out sediments;
step S6, pouring concrete into the pile hole;
step S7, arranging a circular baffle plate with the diameter of b at the upper end of the cylindrical steel casing, wherein the circular baffle plate is plugged in the opening of the pile hole, and b is larger than a;
and step S8, excavating the site near the pile hole, wherein the cylindrical steel casing and the circular baffle plate are always sealed at the opening of the pile hole by utilizing the self gravity in the excavating process.
2. The cast-in-situ bored pile construction method for avoiding empty pile backfill according to claim 1, wherein the positioning of the pile hole center position includes: and measuring the central position of the positioning pile hole by adopting a total station, a theodolite and a level gauge.
3. The cast-in-situ bored pile construction method for avoiding empty pile backfill according to claim 1, wherein in step S6, underwater concrete is poured by a guide pipe method, prefabricated steel bars are hung in a pile hole, the buried depth of the guide pipe is 2-4 m, the distance between the bottom of the pipe and the bottom of the hole after the guide pipe is inserted into the hole is controlled to be 300-500 mm, and concrete is poured into the pile hole by the guide pipe.
4. The cast-in-situ bored pile construction method according to claim 3, wherein in step S7, the circular baffle has a through hole at its center, a positioning rod is inserted into the through hole, the bottom of the positioning rod extends into the concrete, and a positioning flag is set on the top of the positioning rod.
5. The cast-in-situ bored pile construction method for avoiding empty pile backfill according to claim 4, wherein the positioning rods are arranged perpendicular to the circular baffles.
6. The cast-in-situ bored pile construction method according to claim 4, wherein in step S3, the height of the cylindrical steel casing is 1.0m or more, and the upper end opening of the cylindrical steel casing is flush with the ground.
7. The cast-in-situ bored pile construction method according to claim 1, wherein the step S8 further includes removing the circular retaining plate and the cylindrical steel casing after excavating earth in the ground near the pile hole, and performing pile hole backfilling.
8. The cast-in-situ bored pile construction method according to claim 3, wherein in step S5, a secondary hole cleaning is performed before the concrete is poured, and sediment is removed again.
9. The cast-in-situ bored pile construction method for avoiding empty pile backfill according to claim 1, wherein the step S5 further comprises: after the secondary hole cleaning, the hole is detected by using an ultrasonic hole detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111613202.XA CN114232612A (en) | 2021-12-27 | 2021-12-27 | Cast-in-situ bored pile construction method for avoiding empty pile backfilling |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111613202.XA CN114232612A (en) | 2021-12-27 | 2021-12-27 | Cast-in-situ bored pile construction method for avoiding empty pile backfilling |
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| CN114232612A true CN114232612A (en) | 2022-03-25 |
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| CN202111613202.XA Pending CN114232612A (en) | 2021-12-27 | 2021-12-27 | Cast-in-situ bored pile construction method for avoiding empty pile backfilling |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603355A (en) * | 2013-11-19 | 2014-02-26 | 中冶天工集团有限公司 | Empty pile processing method for cast-in-situ bored pile |
| CN108797569A (en) * | 2018-06-26 | 2018-11-13 | 江苏地基工程有限公司 | A kind of control method that drilled pile novel energy-conserving pile crown is superfilled |
| CN113006055A (en) * | 2021-03-04 | 2021-06-22 | 苏州科大岩土工程技术有限公司 | Cast-in-situ bored pile construction method |
-
2021
- 2021-12-27 CN CN202111613202.XA patent/CN114232612A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103603355A (en) * | 2013-11-19 | 2014-02-26 | 中冶天工集团有限公司 | Empty pile processing method for cast-in-situ bored pile |
| CN108797569A (en) * | 2018-06-26 | 2018-11-13 | 江苏地基工程有限公司 | A kind of control method that drilled pile novel energy-conserving pile crown is superfilled |
| CN113006055A (en) * | 2021-03-04 | 2021-06-22 | 苏州科大岩土工程技术有限公司 | Cast-in-situ bored pile construction method |
Non-Patent Citations (2)
| Title |
|---|
| 刘宝;: "城际铁路深基坑围护结构含较长空桩钻孔灌注桩施工技术" * |
| 郑刚: "《群孔效应对周边环境影响的控制措施研究》" * |
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Application publication date: 20220325 |