CN113445499A - Construction method for concrete ramming and expanding head pile in backfilling field - Google Patents
Construction method for concrete ramming and expanding head pile in backfilling field Download PDFInfo
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- CN113445499A CN113445499A CN202110734254.6A CN202110734254A CN113445499A CN 113445499 A CN113445499 A CN 113445499A CN 202110734254 A CN202110734254 A CN 202110734254A CN 113445499 A CN113445499 A CN 113445499A
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- pile
- pipe
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- pile pipe
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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
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
- E02D5/44—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with enlarged footing or enlargements at the bottom of the pile
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0007—Production methods using a mold
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
Abstract
The invention discloses a construction method of a concrete rammed enlarged footing pile in a backfilling field, which adopts a process of drilling first and then sinking a pipe, and squeezes and expands a hard concrete enlarged footing at the bottom end of the pile, thereby greatly improving the bearing capacity of a single pile. The invention is characterized in that a movable steel head plate is connected with a hinge shaft at the bottom end of a pile pipe, the head plate is opened in a hole by means of self weight during construction, and the head plate is closed in the hole by means of a spring arranged on the hinge shaft and hammering the pile pipe or a traction rope is arranged on the head plate. This haulage rope can set up in the stake is intraductal, also can set up outside the stake pipe, if set up must set up a steel pipe protection haulage rope outside the stake pipe, if ground water level is high, this head plate inboard sets up a ring, and the ring outside is around round soft rope or soft area, and the effectual downthehole normal water that prevents gets into in the stake pipe to guarantee construction quality.
Description
Technical Field
The invention relates to the technical field of concrete filling pile construction, in particular to a construction method of a concrete rammed and expanded head pile in a backfill site.
Background
The following situations exist in the mountain-opening backfilling field: the backfill depth is inconsistent, the pile foundation bearing layer height is inconsistent, and the construction pile length change is large. Secondly, the common backfilling field adopts layered rolling or layered dynamic compaction, the compactness of the soil is high, large stones exist in the filled soil, and the pipe sinking construction is difficult. The process of drilling first and sinking pipe later must be adopted. And thirdly, the pile length is changed greatly by adopting the inner and outer tube immersed tube process to construct the enlarged head, the height of a tower frame of the pile driver is limited, and the length of the pile tube needs to be changed frequently. Fourthly, the underground water level of a common site is higher, if a hole is drilled firstly, water with a certain depth is inevitably in the front hole of the immersed tube, and a new construction method is urgently needed to solve the problems in order to prevent the water from entering the pile tube and causing hidden danger of construction quality.
Disclosure of Invention
The invention aims to provide a construction method of a concrete rammed enlarged footing pile in a backfilling field, which aims to solve the problems in the prior art and can effectively prevent water in holes from entering a pile pipe, thereby ensuring the construction quality.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a construction method for ramming and expanding a head pile in a backfill site, which comprises the following steps:
(1) pile lines are laid according to design drawings;
(2) drilling a hole at a pile position by using a drilling machine to form a required depth, wherein the depth is determined by a design drawing and a survey report, and the diameter of the drilled hole is consistent with the designed pile diameter;
(3) adopting a single pile pipe, arranging a movable steel end sealing plate at the bottom end of the pile pipe, hammering the pile pipe to sink into a hole, wherein the end sealing plate is in a closed state when sinking the pipe, and the diameter depth of the sinking pipe is consistent with the designed pile diameter and the pile length;
(4) throwing dry and hard concrete into the pile pipe from the upper end of the pile pipe, lifting the pile pipe, and ensuring that a head sealing plate at the bottom end of the pile pipe is opened and the dry and hard concrete falls into the bottom of the hole; hammering the pile pipe again, and simultaneously ensuring that a head plate at the bottom end of the pile pipe is closed; when the hammering sinking pipe reaches the bottom of the dry and hard concrete, the hammering pile pipe stops, so that the bottom end of the pile is squeezed and expanded to form a dry and hard expanded head;
(5) after the construction of the expanded head is completed, placing the reinforcement cage into the pile pipe;
(6) pouring concrete into the pile pipe, wherein the concrete pouring height is required to ensure that the elevation of the top of the concrete pile after the pile pipe is pulled out is consistent with the elevation of the designed pile top;
(7) and (5) starting a winch to pull out the pile pipe while hammering, and finishing single-pile construction.
Preferably, the diameter of the hole formed by the drilling machine in the step (2) is phi 450 mm-phi 1500 mm.
Preferably, in the step (3), the diameter of the head plate is the same as the outer diameter of the pile pipe, and the head plate is opened in the hole by self weight during construction.
Preferably, the head plate is connected to the bottom end of the pile tube through a hinge shaft, and springs are mounted at two ends of the hinge shaft.
Preferably, the end sealing plate is connected to the bottom end of the pile tube through a hinge shaft, and the end sealing plate is also connected with a traction rope which is arranged in the pile tube or outside the pile tube; when the hauling cable is arranged outside the pile pipe, a steel pipe used for protecting the hauling cable is arranged outside the pile pipe.
Preferably, a steel water sealing ring is welded on the inner side face of the water sealing plate, the water sealing ring is assembled on the inner side of the bottom end of the pile pipe, and a circle of soft rope or soft belt is wound on the outer side of the water sealing ring during pipe sinking.
Preferably, the pile pipe sinking depth in the step (3) is 6-80m, and the diameter of the pile pipe is phi 450 and 1500 mm.
Preferably, in order to ensure that the volume and the diameter of the expansion head meet the design requirements, the construction is repeated according to the step (4) until the requirements are met, and the final ten-stroke penetration is ensured to be less than 5cm when the pipe sinking depth reaches the bottom of the dry and hard concrete each time.
Compared with the prior art, the invention has the following beneficial technical effects:
the construction method of the concrete rammed enlarged footing pile in the backfilling field adopts the process of drilling first and then sinking the pipe, and extrudes and expands a hard concrete enlarged footing at the bottom end of the pile, thereby greatly improving the bearing capacity of the single pile. The invention is characterized in that the bottom end of the pile pipe is connected with a movable steel head sealing plate, the head sealing plate is opened in a hole by self weight during construction, and the head sealing plate is closed in the hole by a spring arranged on a hinge shaft and hammering the pile pipe or by arranging a traction rope on the head sealing plate. If the underground water level is high, a ring is arranged on the inner side of the end sealing plate, and a circle of soft rope or soft belt is wound on the outer side of the ring, so that water in the hole is effectively prevented from entering the pile pipe. Thereby ensuring the construction quality.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic view of a head plate attached using a hinge;
FIG. 2 is a schematic view of the connection of the head plate with a pull cord;
wherein, 1, sealing the head plate; 2, hinging a shaft; 3, a spring; 4, sealing a circular ring; 5, pile pipes; 6, pulling a rope; 7, steel pipes.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a construction method of a concrete rammed enlarged footing pile in a backfilling field, which aims to solve the problems in the prior art and can effectively prevent water in holes from entering a pile pipe, thereby ensuring the construction quality.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-2, the present embodiment provides a method for constructing a concrete rammed and enlarged head pile in a backfill ground, which specifically includes the following construction steps:
(1) and (5) laying the pile line according to a design drawing.
(2) The pile position is first drilled with a drilling machine to a certain depth, and the depth is determined by design drawings and survey reports. The diameter of the drilled hole is consistent with the designed pile diameter.
(3) A single pile pipe and a sealing head plate 1 are connected with the bottom end of the pile pipe, a hammering pile pipe 5 is sunk into a hole, the sealing head plate 1 is in a closed state when the pipe is sunk, and the diameter depth of the sunk pipe is consistent with the designed pile diameter and the pile length.
(4) And (3) putting a certain amount of hard concrete into the pile pipe 5 from the upper end of the pile pipe 5, lifting the pile pipe 5, and ensuring that the end sealing plate 1 at the bottom end of the pile pipe 5 is opened and the hard concrete falls into the bottom of the hole. And hammering the pile pipe 5 again, and simultaneously ensuring that the end sealing plate 1 at the bottom end of the pile pipe is closed. When the hammering sinking pipe reaches the bottom of the dry and hard concrete, the hammering pile pipe 5 stops. Thereby realizing the squeezing and expanding at the bottom end of the pile to form the dry and hard expanded head. If the volume and the diameter of the head are ensured to be enlarged, the construction is repeated according to the steps. And the depth of the immersed tube reaches the bottom of the dry and hard concrete each time, and the final ten-stroke inertial penetration is ensured to be less than 5 cm.
(5) And after the construction of the enlarged footing is finished, the reinforcement cage is placed into the pile pipe 5.
(6) And (3) pouring concrete into the pile pipe 5, wherein the concrete pouring height ensures that the elevation of the top of the concrete pile conforms to the elevation of the designed pile top after the pile pipe is pulled out.
(7) And (5) starting a winch to pull out the pile pipe while hammering, and finishing single-pile construction.
Specifically, the diameter of the hole formed by the drilling machine in the step (2) is phi 450 mm-phi 1500 mm.
In this embodiment, in the step (3), the bottom end of the pile tube 5 is connected with a movable steel head plate 1, the diameter of the head plate 1 is the same as the outer diameter of the pile tube 5, and the head plate 1 is opened in the hole by self weight during construction. The closing of the spring 3 and the hammering pile pipe arranged on the hinge shaft 2 or the setting of the traction rope 6. The hauling cable 6 can be arranged in the pile pipe 5 or outside the pile pipe 5, and if the hauling cable is arranged outside the pile pipe 5, a steel pipe 7 is required to be arranged to protect the hauling cable 6. If the underground water level is high, water is in the hole after drilling, a steel end socket ring 4 is welded on the inner side face of the movable steel end socket plate 1, the diameter of the end socket ring 4 is slightly smaller than the inner diameter of the pile pipe 5, a circle of soft rope or soft belt is wound on the outer side of the end socket ring 4 during pipe sinking, and water is prevented from entering the pile pipe 5 during pipe sinking. The depth of the pile pipe 5 is 6-80m, and the diameter of the pile pipe 5 is phi 450 and 1500 mm.
In addition, the expansion head is made of hard concrete, the pile body is made of concrete with general slump, the two strengths can be the same or different, the two strengths can be the same under the condition that the bearing capacity is required to be higher, and the two strengths can be different under the condition that the bearing capacity is lower.
Example one
The geological soil layer is summarized by a miscellaneous fill backfill layer, the bottom surface of the backfill layer is buried by 15-24 meters in a layered rolling manner, a silty clay layer is buried by 18-30 meters in the bottom surface of the backfill layer, the top surface of the silty clay layer is buried by 25-36 meters in the top surface of the backfill layer. The underground water level is buried by 16 meters. The design parameters of the engineering pile foundation are as follows: the length of the pile is 1.5 meters when the pile enters a strong weathered rock stratum of the third layer. Namely, the actual construction pile length is 26.5-37.5 m, the total number of piles is 275, the diameter of the pile is 600mm, and the concrete strength is C40. 6 main reinforcement bars of the reinforcement cage are phi 16, and the volume of the pile end expanded head is 0.3m3The diameter is larger than 1200mm, and the standard value of the ultimate bearing capacity of the single pile is 7000 KN.
The construction steps are as follows:
(1) pile placing line according to design drawing
(2) And drilling a hole at the pile position by adopting a long spiral drill, wherein the drilling depth is 24 meters, the diameter of the drilled hole is phi 600mm, and the depth of open water in the drilled hole is 8 meters.
(3) The method is characterized in that a pile tube 5 with the outer diameter of 600mm and the inner diameter of 560mm is adopted, a movable steel end sealing plate 1 with the diameter of 600mm is hinged to the bottom end of the pile tube 5, the thickness of the movable steel end sealing plate 1 is 40mm, an end sealing ring 4 with the diameter of 540mm is welded on the end sealing plate 1 towards the bottom end face of the pile tube 5, the height of the end sealing ring 4 is 14mm, a circle of hemp rope is wound outside the end sealing ring 4, and the end sealing plate 1 is tightly matched with the bottom end of the pile tube 5 during tube sinking. Preventing water in the hole from entering the pile pipe 5. The pile pipe 5 is sunk into the soil by a diesel hammer until the depth of the strongly weathered rock of the third layer is 1.5 meters.
(4) The first time of throwing dry and hard concrete of 0.15m from the upper end of the pile pipe 53And (3) lifting the pile pipe 5 upwards by 0.66 m, opening the end sealing plate 1, and closing the end sealing plate 1 by adopting a traction rope 6. Hammering the pile pipe 5 by using a diesel hammer, stopping hammering the pile pipe 5 when the bottom end of the pile pipe 5 is 20cm away from the bottom end face of the hard concrete, and throwing the hard concrete into the pile pipe 5 for a second time by 0.15m3And constructing the enlarged head according to the method until the enlarged head meets the design requirement. And the final ten-stroke of the hammering inertia penetration degree is ensured to be less than 3 cm.
(5) The reinforcement cage is placed inside the pile tube 5.
(6) And (3) pouring concrete into the pile pipe 5, wherein the pouring height must ensure that the elevation of the top of the concrete pile after the pile pipe 5 is pulled out conforms to the elevation of the designed pile top.
(7) And (5) starting a winch to pull out the pile pipe 5 while hammering, and finishing single-pile construction.
The engineering is put into a device, the construction date is 35 days, and the design requirements are met through detection after the construction is finished.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The construction method for the concrete ramming and expanding head pile in the backfill site is characterized by comprising the following steps of:
(1) pile lines are laid according to design drawings;
(2) drilling a hole at a pile position by using a drilling machine to form a required depth, wherein the depth is determined by a design drawing and a survey report, and the diameter of the drilled hole is consistent with the designed pile diameter;
(3) adopting a single pile pipe, arranging a movable steel end sealing plate at the bottom end of the pile pipe, hammering the pile pipe to sink into a hole, wherein the end sealing plate is in a closed state when sinking the pipe, and the diameter depth of the sinking pipe is consistent with the designed pile diameter and the pile length;
(4) throwing dry and hard concrete into the pile pipe from the upper end of the pile pipe, lifting the pile pipe, and ensuring that a head sealing plate at the bottom end of the pile pipe is opened and the dry and hard concrete falls into the bottom of the hole; hammering the pile pipe again, and simultaneously ensuring that a head plate at the bottom end of the pile pipe is closed; when the hammering sinking pipe reaches the bottom of the dry and hard concrete, the hammering pile pipe stops, so that the bottom end of the pile is squeezed and expanded to form a dry and hard expanded head;
(5) after the construction of the expanded head is completed, placing the reinforcement cage into the pile pipe;
(6) pouring concrete into the pile pipe, wherein the concrete pouring height is required to ensure that the elevation of the top of the concrete pile after the pile pipe is pulled out is consistent with the elevation of the designed pile top;
(7) and (5) starting a winch to pull out the pile pipe while hammering, and finishing single-pile construction.
2. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: the diameter of the hole formed by the drilling machine in the step (2) is phi 450 mm-phi 1500 mm.
3. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: and (4) in the step (3), the diameter of the end sealing plate is the same as the outer diameter of the pile pipe, and the end sealing plate is opened in the hole by self weight during construction.
4. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: the end sealing plate is connected to the bottom end of the pile pipe through a hinge shaft, and springs are installed at two ends of the hinge shaft.
5. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: the end sealing plate is connected to the bottom end of the pile pipe through a hinge shaft, and a traction rope is further connected to the end sealing plate and arranged in the pile pipe or outside the pile pipe; when the hauling cable is arranged outside the pile pipe, a steel pipe used for protecting the hauling cable is arranged outside the pile pipe.
6. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: the inner side surface of the end sealing plate is welded with a steel water sealing ring, the water sealing ring is assembled on the inner side of the bottom end of the pile pipe, and a circle of soft rope or soft belt is wound on the outer side of the water sealing ring during pipe sinking.
7. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: in the step (3), the sinking depth of the pile tube is 6-80m, and the diameter of the pile tube is phi 450 and 1500 mm.
8. The construction method of the concrete rammed enlarged head pile for the backfill site according to claim 1, characterized in that: in order to ensure that the volume and the diameter of the expansion head meet the design requirements, the construction is repeated according to the step (4) until the requirements are met, and the final ten-stroke penetration is ensured to be less than 5cm when the pipe sinking depth reaches the bottom of the dry and hard concrete each time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110734254.6A CN113445499A (en) | 2021-06-30 | 2021-06-30 | Construction method for concrete ramming and expanding head pile in backfilling field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110734254.6A CN113445499A (en) | 2021-06-30 | 2021-06-30 | Construction method for concrete ramming and expanding head pile in backfilling field |
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| CN113445499A true CN113445499A (en) | 2021-09-28 |
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| CN202110734254.6A Pending CN113445499A (en) | 2021-06-30 | 2021-06-30 | Construction method for concrete ramming and expanding head pile in backfilling field |
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Citations (4)
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|---|---|---|---|---|
| CN104727308A (en) * | 2015-02-12 | 2015-06-24 | 刘清洁 | Immersed tube compaction pile or cast-in-place concrete pile construction device and method |
| CN108894205A (en) * | 2018-07-26 | 2018-11-27 | 中国电建集团成都勘测设计研究院有限公司 | Pile making method of the interior ram-expanded pile in deep and thick layer layer |
| CN111549770A (en) * | 2020-05-15 | 2020-08-18 | 中国电建集团成都勘测设计研究院有限公司 | Construction method of pipe sinking cast-in-place pile in backfill soil layer |
| CN111851479A (en) * | 2020-07-30 | 2020-10-30 | 陕西龙海新创基础工程有限公司 | Method for constructing immersed tube rammed cast-in-place pile in sand layer or gravel layer |
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2021
- 2021-06-30 CN CN202110734254.6A patent/CN113445499A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727308A (en) * | 2015-02-12 | 2015-06-24 | 刘清洁 | Immersed tube compaction pile or cast-in-place concrete pile construction device and method |
| CN108894205A (en) * | 2018-07-26 | 2018-11-27 | 中国电建集团成都勘测设计研究院有限公司 | Pile making method of the interior ram-expanded pile in deep and thick layer layer |
| CN111549770A (en) * | 2020-05-15 | 2020-08-18 | 中国电建集团成都勘测设计研究院有限公司 | Construction method of pipe sinking cast-in-place pile in backfill soil layer |
| CN111851479A (en) * | 2020-07-30 | 2020-10-30 | 陕西龙海新创基础工程有限公司 | Method for constructing immersed tube rammed cast-in-place pile in sand layer or gravel layer |
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