CN110700241A - Cast-in-situ bored pile and construction method thereof - Google Patents
Cast-in-situ bored pile and construction method thereof Download PDFInfo
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- CN110700241A CN110700241A CN201910948751.9A CN201910948751A CN110700241A CN 110700241 A CN110700241 A CN 110700241A CN 201910948751 A CN201910948751 A CN 201910948751A CN 110700241 A CN110700241 A CN 110700241A
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 55
- 238000010276 construction Methods 0.000 title claims abstract description 30
- 239000004567 concrete Substances 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 239000002689 soil Substances 0.000 claims abstract description 29
- 239000002002 slurry Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 17
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 230000005484 gravity Effects 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 5
- 239000010959 steel Substances 0.000 claims abstract description 5
- 239000011159 matrix material Substances 0.000 claims description 7
- 239000011440 grout Substances 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- 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
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a cast-in-situ bored pile and a construction method thereof, wherein the construction method comprises the steps of burying a pile casing downwards along a position line, drilling an upper soil layer, a pressure-bearing water layer and a lower soil layer through the pile casing by adopting drilling equipment to form a pile hole, and injecting high-specific-gravity slurry into the pile hole by grouting equipment in the drilling process to resist the upward gushing of underground water in the pressure-bearing water layer, wherein the slurry specific gravity of the high-specific-gravity slurry is 12kN/m3Stopping grouting, hoisting the steel reinforcement cage, pouring concrete in the pile hole through the concrete guide pipe, and extruding the mud with large specific gravity in the pile hole in the concrete pouring process; after the concrete pouring is finished, pulling out the concrete guide pipe; after the concrete reaches the preset strength to form the reinforced concrete column, pulling out the pile casing; and removing the reinforced concrete column above the ground level to form the cast-in-situ bored pile. The invention can be constructed in the soil body environment with the pressure-bearing water layer, and reduces the construction of the cast-in-situ bored pileDifficulty.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a cast-in-situ bored pile and a construction method thereof.
Background
In the process of developing the underground space of a building, a vertical supporting system formed by engineering piles and cast-in-situ bored piles is generally adopted. In the process of constructing the cast-in-situ bored pile for the existing basement or the newly-built basement, when the cast-in-situ bored pile penetrates through a pressure-bearing water layer along a soil body by drilling downwards, pressure-bearing water can gush upwards, so that the cast-in-situ bored pile cannot be constructed in the soil body environment with the pressure-bearing water layer. Thereby improving the difficulty of the downward continuous drilling construction of the cast-in-situ bored pile.
Disclosure of Invention
The invention aims to solve the technical problem of providing a cast-in-situ bored pile and a construction method thereof, so as to solve the problem of difficult construction when a pressure-bearing water layer is penetrated.
In order to solve the above technical problems, the present invention provides a method for constructing a cast-in-situ bored pile,
discharging a position line of the bored pile to be constructed on the ground plane;
embedding a protective cylinder downwards along the position line to enable the protective cylinder to be partially exposed above the ground plane;
drilling an upper soil layer, a confined water layer and a lower soil layer below a ground level through a pile casing by using drilling equipment to form a pile hole, and injecting high-specific-gravity slurry into the pile hole through grouting equipment in the drilling process to resist the upward gushing of underground water in the confined water layer, wherein the slurry specific gravity of the high-specific-gravity slurry is more than 12kN/m 3;
after the drilling equipment penetrates through the lower soil layer to drill holes so that the pile holes reach a preset depth, stopping grouting by the grouting equipment, and hoisting a reinforcement cage into the pile holes;
after the reinforcement cage is installed, inserting a concrete guide pipe into the pile hole, pouring concrete into the pile hole through the concrete guide pipe, and extruding out the large-proportion slurry injected into the pile hole in the concrete pouring process;
after concrete pouring in the pile hole is finished, pulling out the concrete guide pipe;
after the concrete in the pile hole reaches the preset strength to form a reinforced concrete column, pulling out the pile casing;
and removing the reinforced concrete column above the ground level to form the cast-in-situ bored pile.
Further, according to the construction method of the cast-in-situ bored pile provided by the invention, after grouting equipment stops grouting and before a reinforcement cage is installed, hole cleaning is carried out on a pile hole for the first time.
Furthermore, the construction method of the cast-in-situ bored pile provided by the invention is used for performing secondary hole cleaning on the pile hole after the concrete guide pipe is inserted.
Further, according to the construction method of the cast-in-situ bored pile provided by the invention, when concrete is poured in the pile hole, the concrete guide pipe is gradually lifted upwards until the concrete is poured in the pile hole, and then the concrete guide pipe is pulled out from the pile hole.
Further, the construction method of the bored pile provided by the invention comprises the steps that the grouting equipment comprises a grouting pump, a grouting pipe and a slurry outlet pipe which are communicated with the grouting pump, and a mud box which is communicated with the grouting pipe and the slurry outlet pipe, wherein the mud box comprises a mud settling tank and a mud circulating tank, the grouting pipe is communicated with the mud circulating tank, and the slurry outlet pipe is communicated with the mud settling tank.
Further, according to the construction method of the cast-in-situ bored pile provided by the invention, the drilling equipment is a water drilling machine, and the water drilling machine comprises a drill rod and a drill bit.
Further, according to the construction method of the cast-in-situ bored pile provided by the invention, when the ground plane comprises the concrete laminate, the position line is drawn on the concrete laminate, and the hole is formed by drilling and cutting the thinner concrete laminate along the position line in a circular matrix manner; drilling holes in a circular matrix mode along the position line and drilling and cutting holes in the position line for the thicker concrete layer plate to form holes; and (4) removing the redundant concrete on the inner side of the hole by using a hand hammer and a drill rod, removing the concrete in the hole, and embedding a protective cylinder downwards in the hole.
In order to solve the technical problems, the invention provides a cast-in-situ bored pile which comprises a pile hole penetrating through an upper soil layer, a confined water layer and a lower soil layer below the ground level in sequence, wherein a steel reinforcement cage and a reinforced concrete column formed by replacing concrete for resisting high-specific gravity mud gushing upwards from the confined water layer are arranged in the pile hole.
Furthermore, the cast-in-situ bored pile provided by the invention is arranged below a bottom floor slab of an existing basement.
Further, according to the cast-in-situ bored pile provided by the invention, the cast-in-situ bored pile is arranged below a foundation pit of a newly-built basement.
Compared with the prior art, the cast-in-situ bored pile and the construction method thereof provided by the invention have the advantages that the large-specific-gravity slurry is injected into the pile hole to resist the upward gushing of underground water in the confined water layer, so that the cast-in-situ bored pile is constructed by penetrating the confined water layer. The large-specific-gravity slurry not only presses underground water gushing caused by a bearing water layer, but also can ensure the stability of the hole wall of the pile hole, prevent the pile hole from collapsing and reduce the construction difficulty of the cast-in-situ bored pile. The cast-in-situ bored pile provided by the invention is positioned on an upper soil body layer, a pressure-bearing water layer and a lower soil body layer below the ground level, and can be constructed in a soil body environment with the pressure-bearing water layer. The cast-in-situ bored pile provided by the invention is used for replacing concrete with large specific gravity mud and a reinforced concrete column formed by a reinforcement cage, and the stability of the cast-in-situ bored pile is improved.
Drawings
Fig. 1 to 9 are schematic views illustrating a construction process of a cast-in-situ bored pile according to an embodiment of the present invention;
fig. 10 to 11 are schematic structural views illustrating the distribution of concrete floor drilling holes according to an embodiment of the present invention;
fig. 12 is a flow chart of a cast-in-situ bored pile according to an embodiment of the present invention.
Shown in the figure: 101. the method comprises the following steps of casing, 102, grouting equipment, 103, drilling equipment, 104, mud with large specific gravity, 105, a reinforcement cage, 106, a concrete guide pipe, 107, concrete, 200, a ground level, 201, an upper soil layer, 202, a pressure water layer, 203, a lower soil layer, 204, pile holes, 300, a position line, 400 and drilling.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 12, an embodiment of the present invention provides a method for constructing a cast-in-situ bored pile, including:
In step 504, referring to fig. 4, after the drilling equipment 103 drills holes through the lower soil layer 203 to make the pile holes 204 reach a predetermined depth, the grouting equipment 102 stops grouting, and the reinforcement cage 105 is hung in the pile holes 204.
In step 506, referring to fig. 8, after the concrete 107 is poured into the pile hole 204, the concrete pipe 106 is pulled out.
In step 507, referring to fig. 9, after the concrete 107 in the pile hole 204 reaches the predetermined strength to form the reinforced concrete column, the casing 101 is pulled out. For example, the pile casing 101 is pulled out after concrete pouring is completed for 2 hours, and the reinforced concrete column head is cut off by using a hydraulic splitter, so that the reinforced concrete column head is integrally broken. The predetermined strength may be that the reinforced concrete column is completely solidified or that the reinforced concrete column is not completely solidified.
According to the construction method of the cast-in-situ bored pile provided by the embodiment of the invention, after grouting of the grouting equipment 102 is stopped and before the reinforcement cage 105 is installed, the pile hole 204 is cleaned for the first time. After the concrete pipe 106 is inserted, the pile hole 204 is cleaned a second time. Cleaning the pile hole 204 can remove larger soil blocks or obstacles in the pile hole 204, so as to improve the formation of the reinforced concrete column with stable structure by pouring concrete 107 in the pile hole 204.
Referring to fig. 7, in the construction method of the cast-in-situ bored pile according to the embodiment of the present invention, when the concrete 107 is poured into the pile hole 204, the concrete guide pipe 106 is gradually lifted upward until the concrete 107 is poured into the pile hole 204, and then the concrete guide pipe 106 is pulled out from the pile hole 204. Gradually pulling up the concrete pipe 106 enables the concrete 107 to gradually displace the heavy weight mud 104 from the bottom of the pile hole 204 upwards.
In the construction method of the bored pile provided by the embodiment of the present invention, the grouting equipment 102 includes a grouting pump, a grouting pipe and a grout outlet pipe which are communicated with the grouting pump, and a mud tank which is communicated with the grouting pipe and the grout outlet pipe, the mud tank includes a mud settling tank and a mud circulation tank, the grouting pipe is communicated with the mud circulation tank, and the grout outlet pipe is communicated with the mud settling tank.
Referring to fig. 3, in the method for constructing a cast-in-place bored pile according to the embodiment of the present invention, the drilling equipment 103 is a water drilling machine, and the water drilling machine includes a drill rod and a drill bit. The drilling apparatus 103 may employ a drilling machine known in the art.
Referring to fig. 10 to 11, in the method for constructing a cast-in-place bored pile according to the embodiment of the present invention, when a concrete slab is included on a ground plane 200, a position line is positioned on the concrete slab, and holes are cut in a circular matrix manner 400 along the position line 300 for the thinner concrete slab, as shown in fig. 10; drilling 400 in a circular matrix along the location line 300 for the thicker concrete slab and cutting the holes 400 into openings within the location line 300, as shown in FIG. 11; and (3) removing the redundant concrete 107 on the inner side of the hole by using a hand hammer and a drill rod, removing the concrete 107 in the hole, and burying the pile casing 101 downwards in the hole. The purpose of drilling and cutting the concrete layer plate to form the opening is to remove the concrete layer plate at the corresponding position of the position line, so as to embed the pile casing 101 and construct the pile hole 204. Drilling holes in a circular matrix and cutting holes 400 in the position lines 300 are suitable for the construction of concrete slabs of any thickness.
Referring to fig. 7 and 9, an embodiment of the invention provides a cast-in-situ bored pile, which includes a pile hole 204 penetrating an upper soil layer 201, a confined water layer 202, and a lower soil layer 203 below a ground level 200 in sequence, and a steel reinforcement cage 105 and a steel reinforcement concrete column formed of concrete 107 for replacing a large-gravity slurry 104 for resisting upward gushing of the confined water layer 202 are disposed in the pile hole 204.
According to the cast-in-situ bored pile provided by the embodiment of the invention, the cast-in-situ bored pile is arranged below a bottom floor slab of an existing basement. Namely, the cast-in-situ bored pile provided by the embodiment of the invention can be suitable for the maintenance of the vertical supporting system of the existing basement, the reconstruction engineering of the existing basement such as storey addition and the like.
According to the cast-in-situ bored pile provided by the embodiment of the invention, the cast-in-situ bored pile is arranged below a foundation pit of a newly-built basement. Namely, the embodiment of the invention can be applied to new construction of buildings or structures.
According to the cast-in-situ bored pile and the construction method thereof provided by the embodiment of the invention, the large-specific-gravity slurry 104 is injected into the pile hole 204 to resist the upward gushing of underground water in the confined water layer, so that the cast-in-situ bored pile is constructed by penetrating the confined water layer 202. The large-specific gravity mud 104 not only suppresses the groundwater gushing caused by the confined water layer 202, but also can ensure the stability of the hole wall of the pile hole 204 and prevent the pile hole 204 from collapsing, thereby reducing the construction difficulty of the cast-in-situ bored pile. The cast-in-situ bored pile provided by the embodiment of the invention is positioned on an upper soil layer 201, a confined water layer 202 and a lower soil layer 203 below a ground level 200, and can be constructed in a soil environment with the confined water layer 202. The cast-in-situ bored pile provided by the embodiment of the invention is used for replacing a reinforced concrete 107 pile body formed by concrete 107 of large-specific-weight mud 104 and a reinforcement cage 105, and the stability of the cast-in-situ bored pile is improved.
The present invention is not limited to the above-described embodiments, and any variations and modifications thereof by those skilled in the art are intended to fall within the scope of the appended claims.
Claims (10)
1. A construction method of a cast-in-situ bored pile is characterized in that,
discharging a position line of the bored pile to be constructed on the ground plane;
embedding a protective cylinder downwards along the position line to enable the protective cylinder to be partially exposed above the ground plane;
drilling an upper soil layer, a confined water layer and a lower soil layer below a ground level through a pile casing by using drilling equipment to form a pile hole, and injecting high-specific-gravity slurry into the pile hole through grouting equipment in the drilling process to resist the upward gushing of underground water in the confined water layer, wherein the slurry specific gravity of the high-specific-gravity slurry is more than 12kN/m 3;
after the drilling equipment penetrates through the lower soil layer to drill holes so that the pile holes reach a preset depth, stopping grouting by the grouting equipment, and hoisting a reinforcement cage into the pile holes;
after the reinforcement cage is installed, inserting a concrete guide pipe into the pile hole, pouring concrete into the pile hole through the concrete guide pipe, and extruding out the large-proportion slurry injected into the pile hole in the concrete pouring process;
after concrete pouring in the pile hole is finished, pulling out the concrete guide pipe;
after the concrete in the pile hole reaches the preset strength to form a reinforced concrete column, pulling out the pile casing;
and removing the reinforced concrete column above the ground level to form the cast-in-situ bored pile.
2. The cast-in-situ bored pile construction method according to claim 1, wherein after the grouting of the grouting equipment is stopped and before the completion of the reinforcement cage installation, a first hole cleaning is performed on the pile hole.
3. The cast-in-situ bored pile construction method according to claim 1, wherein the pile hole is subjected to a second hole cleaning after the concrete pipe is inserted.
4. The cast-in-situ bored pile construction method according to claim 1, wherein the concrete guide pipe is gradually pulled upward while the concrete is cast in the pile hole until the concrete is cast in the pile hole, and then the concrete guide pipe is pulled out from the pile hole.
5. The method of constructing a bored pile according to claim 1, wherein the grouting apparatus includes a grouting pump, a grouting pipe and a grout outlet pipe communicating with the grouting pump, and a mud tank communicating with the grouting pipe and the grout outlet pipe, the mud tank includes a mud settling tank and a mud circulation tank, the grouting pipe communicates with the mud circulation tank, and the grout outlet pipe communicates with the mud settling tank.
6. The method of constructing a bored pile according to claim 1, wherein the drilling equipment is a water drilling machine including a drill pipe and a drill bit.
7. The cast-in-situ bored pile construction method according to claim 1, wherein when a concrete slab is included on the ground plane, a position line is drawn on the concrete slab, and the opening is bored and cut in a circular matrix along the position line for a thin concrete slab; drilling holes in a circular matrix mode along the position line and drilling and cutting holes in the position line for the thicker concrete layer plate to form holes; and (4) removing the redundant concrete on the inner side of the hole by using a hand hammer and a drill rod, removing the concrete in the hole, and embedding a protective cylinder downwards in the hole.
8. A cast-in-situ bored pile is characterized by comprising a pile hole which sequentially penetrates through an upper soil layer, a pressure-bearing water layer and a lower soil layer below a ground level, wherein a steel reinforcement cage and a reinforced concrete column which is used for replacing concrete of large-proportion mud for resisting upward gushing of the pressure-bearing water layer are arranged in the pile hole.
9. The bored pile of claim 8, wherein the bored pile is disposed below a floor slab of an existing basement.
10. The cast-in-situ pile as recited in claim 8, wherein the cast-in-situ pile is disposed below a foundation pit of a newly-built basement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948751.9A CN110700241A (en) | 2019-10-08 | 2019-10-08 | Cast-in-situ bored pile and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948751.9A CN110700241A (en) | 2019-10-08 | 2019-10-08 | Cast-in-situ bored pile and construction method thereof |
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| CN110700241A true CN110700241A (en) | 2020-01-17 |
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| CN201910948751.9A Pending CN110700241A (en) | 2019-10-08 | 2019-10-08 | Cast-in-situ bored pile and construction method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720186A (en) * | 2012-07-10 | 2012-10-10 | 上海港务工程公司 | Underwater once pouring method for variable cross-section bored cast-in-place pile |
| CN104120716A (en) * | 2013-04-28 | 2014-10-29 | 杨哲 | Slurry wall protection construction method for bored pile |
| CN104895054A (en) * | 2015-04-23 | 2015-09-09 | 侨健新能源科技（苏州）有限公司 | Construction method of fiber rib concrete uplift pile |
| CN105442532A (en) * | 2015-11-19 | 2016-03-30 | 杭州江润科技有限公司 | Construction method for pile-head-expanded bored pile |
| CN107524142A (en) * | 2017-09-20 | 2017-12-29 | 中国二十冶集团有限公司 | A kind of holing with slurry wall protection cast-in-place pile construction method |
| CN109914455A (en) * | 2019-03-29 | 2019-06-21 | 广西鑫豪建筑工程有限公司 | A kind of structure foundation cast-in-place pile construction method |
| CN211646351U (en) * | 2019-10-08 | 2020-10-09 | 上海建工一建集团有限公司 | Cast-in-situ bored pile |
-
2019
- 2019-10-08 CN CN201910948751.9A patent/CN110700241A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102720186A (en) * | 2012-07-10 | 2012-10-10 | 上海港务工程公司 | Underwater once pouring method for variable cross-section bored cast-in-place pile |
| CN104120716A (en) * | 2013-04-28 | 2014-10-29 | 杨哲 | Slurry wall protection construction method for bored pile |
| CN104895054A (en) * | 2015-04-23 | 2015-09-09 | 侨健新能源科技（苏州）有限公司 | Construction method of fiber rib concrete uplift pile |
| CN105442532A (en) * | 2015-11-19 | 2016-03-30 | 杭州江润科技有限公司 | Construction method for pile-head-expanded bored pile |
| CN107524142A (en) * | 2017-09-20 | 2017-12-29 | 中国二十冶集团有限公司 | A kind of holing with slurry wall protection cast-in-place pile construction method |
| CN109914455A (en) * | 2019-03-29 | 2019-06-21 | 广西鑫豪建筑工程有限公司 | A kind of structure foundation cast-in-place pile construction method |
| CN211646351U (en) * | 2019-10-08 | 2020-10-09 | 上海建工一建集团有限公司 | Cast-in-situ bored pile |
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