CN106836216B - Pile foundation back-pressure concrete dado construction auxiliary device and construction method thereof - Google Patents
Pile foundation back-pressure concrete dado construction auxiliary device and construction method thereof Download PDFInfo
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- CN106836216B CN106836216B CN201710188625.9A CN201710188625A CN106836216B CN 106836216 B CN106836216 B CN 106836216B CN 201710188625 A CN201710188625 A CN 201710188625A CN 106836216 B CN106836216 B CN 106836216B
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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
- 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
- E02D5/385—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds with removal of the outer mould-pipes
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- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
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Abstract
The invention discloses a pile foundation back pressure concrete dado construction auxiliary device, which comprises a steel casing and a conical cap fixed at the top of the steel casing, wherein the steel casing is formed by enclosing two semi-arc steel plates, namely a first semi-arc steel plate and a second semi-arc steel plate; the two side end faces of the first semicircular arc-shaped steel plate are fixedly connected with first connecting portions respectively, the two side end faces of the second semicircular arc-shaped steel plate are fixedly connected with second connecting portions respectively, a first bolt hole is formed in each first connecting portion, a second bolt hole is formed in each second connecting portion, and a bolt is connected between each first bolt hole and each second bolt hole. The invention has the advantages of safety, reliability, economy, convenience and wide application range, and has good practicability and market application value.
Description
Technical Field
The invention relates to the technical field of pile foundation construction, in particular to a pile foundation back pressure concrete dado construction auxiliary device and a construction method thereof.
Background
The concrete pile gene has reliable quality, mature construction technology, strong stratum adaptability and good bearing capacity, and is widely applied to various foundation projects. In the drilling construction process of the concrete pile foundation, due to the influence factors of underground water, rock mass crushing and weathering, underground sludge, undefined weak soil interlayer and the like, hole collapse occurs under various possible conditions, the hole collapse condition is the key for influencing the hole forming and quality assurance of the pile foundation, and the construction efficiency and cost control of the pile foundation are also directly limited. Aiming at the problem of hole collapse in the pile foundation construction process, the pile hole retaining wall is manufactured by adopting a structure of back pressure concrete at present, so that the hole collapse is prevented, but the pouring amount of the back pressure concrete is large, and the resistance of a drilling machine is large in the subsequent retaining wall forming process, so that the construction cost is increased, and the pile hole retaining wall is not green and environment-friendly; and the back pressure retaining wall has small height and large construction limitation.
Disclosure of Invention
The invention aims to solve the defects of the background technology and provide the pile foundation back pressure concrete dado construction auxiliary device and the construction method thereof, wherein the pile foundation back pressure concrete dado construction auxiliary device is simple in structure, convenient to construct and low in construction cost.
In order to realize the purpose, the pile foundation back pressure concrete dado construction auxiliary device designed by the invention is characterized in that: the steel protecting tube is formed by two semicircular arc-shaped steel plates which are respectively a first semicircular arc-shaped steel plate and a second semicircular arc-shaped steel plate; the bolt is characterized in that the end faces of two sides of the first semicircular arc-shaped steel plate are fixedly connected with first connecting portions respectively, the end faces of two sides of the second semicircular arc-shaped steel plate are fixedly connected with second connecting portions respectively, a first bolt hole is formed in the first connecting portion, a second bolt hole is formed in the second connecting portion, and a bolt is connected between the first bolt hole and the second bolt hole.
Specifically, the top surface of first half circular arc steel sheet and the top surface of second half circular arc steel sheet are equipped with a plurality of diplopore otic placodes along respective cambered surface direction interval respectively, open the bottom circumference of toper cap has a plurality of otic placode locating holes that correspond with the diplopore otic placode, the diplopore otic placode passes the cooperation of otic placode locating hole and is fixed with the shackle, the shackle is fixed in the otic placode of diplopore otic placode lower part downtheholely.
Specifically, the first connecting portion comprises a first flat plate fixedly connected to end faces on two sides of the first semi-circular-arc-shaped steel plate and a first L-shaped plate fixed on the first flat plate and facing the inner side of the steel casing, the first L-shaped plate comprises a first connecting plate perpendicular to the first flat plate and a second connecting plate perpendicular to the first connecting plate and parallel to the first flat plate, and the first bolt holes are arranged in the length direction of the second connecting plate at intervals; the second connecting portion comprise second flat plates fixedly connected to the end faces of the two sides of the second semicircular arc-shaped steel plate and second L-shaped plates fixed to the second flat plates and facing the inner side of the steel casing, each second L-shaped plate comprises a third connecting plate perpendicular to the second flat plate and a fourth connecting plate perpendicular to the third connecting plate and parallel to the second flat plate, and the second bolt holes are arranged in the length direction of the fourth connecting plate at intervals.
Preferably, a stiffening plate is fixedly connected between the first connecting plate and the first flat panel, and a stiffening plate is also fixedly connected between the third connecting plate and the second flat panel.
Furthermore, a first telescopic regulator which enables the first semicircular arc-shaped steel plate to expand towards two sides and a second telescopic regulator which enables the second semicircular arc-shaped steel plate to expand towards two sides are respectively arranged in the first semicircular arc-shaped steel plate and the second semicircular arc-shaped steel plate.
Specifically, the first telescopic regulator comprises screw fixing seats fixed on the inner walls of two sides of a first semicircular arc-shaped steel plate, screws are fixed on the screw fixing seats, an internal thread sleeve is connected between the end parts of the screws on the two sides of the first semicircular arc-shaped steel plate, and an operating rod which is vertical to the internal thread sleeve in the axial direction of the internal thread sleeve is fixed on the internal thread sleeve; the second telescopic adjuster comprises screw fixing seats fixed on the inner walls of the two sides of the second semicircular arc-shaped steel plate, screws are fixed on the screw fixing seats, internal thread sleeves are connected between the screw ends of the two sides of the first semicircular arc-shaped steel plate, and operating rods which are perpendicular to the axial direction of the internal thread sleeves are fixed on the internal thread sleeves.
Furthermore, an inner support is fixed in the steel casing, a water stopping cloth is fixed in a gap between the first flat plate and the second flat plate, the bottom of the steel casing is provided with a blade supporting leg, and the blade supporting leg is a steel plate structure with slopes and the thickness of the blade supporting leg from the bottom end to the top end is increased in sequence.
The construction method of the pile foundation back pressure concrete dado construction auxiliary device based on the above comprises the following steps:
1) adopting a drilling machine with a drill bit 10-20 cm larger than the designed size of the pile foundation to drill the pile foundation to a preset position of the pile foundation, and withdrawing the drilling machine;
2) and adopting the auxiliary tool with the same inner diameter as the designed diameter of the pile foundation to complete the assembly and brush a release agent on the surface of the steel pile casing, hoisting the auxiliary tool to the bottom of the pile foundation hole through a crane and then pouring back pressure concrete, integrally hoisting the auxiliary tool out before and after the back pressure concrete reaches the initial setting time point, and waiting for the back pressure concrete to be solidified.
In the step 1, after pile foundation drilling operation is carried out by the drilling machine, when hole collapse occurs in a pile foundation hole, an auxiliary tool with the inner diameter smaller than the diameter of the collapsed hole is adopted, assembling is completed, the auxiliary tool is hoisted to the bottom of the collapsed hole through a crane and is basically stable, back pressure concrete is poured to fill a gap between the steel pile casing and the hole wall of a pile foundation hole, the auxiliary tool is integrally hoisted out before and after the time point that the back pressure concrete reaches initial setting, and finally the drilling machine drills away the back pressure concrete in the designed diameter of the pile foundation at one time.
And 2, when the length of the pile foundation hole exceeds the steel casing of the auxiliary tool, after the first poured counter-pressure concrete is solidified, hoisting the auxiliary tool by using a hoisting machine, placing the auxiliary tool above the first poured counter-pressure concrete, enabling the auxiliary tool to coincide with the retaining wall of the first poured counter-pressure concrete by 0.5-1 m, then performing second operation of pouring the counter-pressure concrete in a state that the auxiliary tool is hoisted, and finally drilling by using a drilling machine to remove the counter-pressure concrete in the designed diameter of the pile foundation at one time.
The invention has the beneficial effects that: safety: the hole collapse risk can be eliminated in advance, meanwhile, the hole collapse treatment is carried out without worker hole descending, and the construction safety is good. Secondly, reliability: the structure meets the construction stress requirement. Economy: the device is low in cost and can be repeatedly utilized, the use amount of the back pressure concrete is saved, the drilling time of the drilling machine is shortened, and the construction cost is reduced. Fourthly, convenience is achieved: the device is assembled outside the pile foundation hole, can realize the adjustment of the transverse and longitudinal width and is convenient to install. Wide application range: the method is suitable for preventing and treating the section which is easy to collapse on the shallow layer of the pile foundation hole, and is also suitable for treating the section which is easy to collapse on the deep layer.
Drawings
FIG. 1 is a top view of a steel casing according to the present invention;
FIG. 2 is a schematic structural diagram of a first semicircular arc-shaped steel plate joint in the invention;
FIG. 3 is a schematic view of a telescopic regulator according to the present invention;
FIG. 4 is a schematic structural view of the auxiliary device of the present invention installed in a pile hole;
FIG. 5 is an enlarged view of the structure at A in FIG. 4;
FIG. 6 is an enlarged view of the structure at B in FIG. 4;
the steel pile comprises a steel casing (1.1, a first semicircular arc steel plate, 1.2, a second semicircular arc steel plate), 2 a conical cap, 3 a first bolt hole, 4 a second bolt hole, 5 a bolt, 6 a double-hole lug plate, 7 a lug plate positioning hole, 8 a shackle, 9 a first flat plate, 10 a first L-shaped plate (10.1, a first connecting plate and 10.2 a second connecting plate), 11 a second flat plate, 12 a second L-shaped plate (12.1, a third connecting plate and 12.2 a fourth connecting plate), 13 a stiffening plate, 14 a first telescopic regulator, 15 a second telescopic regulator, 16 a screw fixing seat, 17 a screw, 18 an internal thread sleeve, 19 an operating rod, 20 an internal support, 21 a blade supporting foot, 22 a pile foundation hole, 23 back pressure concrete and 24 water stop cloth.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
The pile foundation back pressure concrete dado construction auxiliary device shown in fig. 1-6 comprises a steel casing 1 and a conical cap 2 fixed at the top of the steel casing 1, wherein the steel casing 1 is formed by two semicircular arc steel plates which are respectively a first semicircular arc steel plate 1.1 and a second semicircular arc steel plate 1.2 in a surrounding manner; the end faces of the two sides of the first half-circular-arc-shaped steel plate 1.1 are respectively and fixedly connected with first connecting portions, each first connecting portion comprises a first flat plate 9 fixedly connected to the end faces of the two sides of the first half-circular-arc-shaped steel plate 1.1 and a first L-shaped plate 10 fixed on the first flat plate 9 and facing the inner side of the steel casing 1, each first L-shaped plate 10 comprises a first connecting plate 10.1 perpendicular to the first flat plate 9 and a second connecting plate 10.2 perpendicular to the first connecting plate 10.1 and parallel to the first flat plate 9, stiffening plates 13 are fixedly connected between the first connecting plates 10.1 and the first flat plates 9, and the first bolt holes 3 are arranged in the length direction of the second connecting plates 10.2 at intervals.
The both sides terminal surface of second half-circular arc steel sheet 1.2 is fixedly connected with second connecting portion respectively, the second connecting portion include fixed connection in the second flat panel 11 of second half-circular arc steel sheet 1.2 both sides terminal surface and be fixed in on the second flat panel 11, towards the inboard second L template 12 of steel casing 1, second L template 12 includes third connecting plate 12.1 and the fourth connecting plate 12.2 perpendicular with third connecting plate 12.1 and parallel with second flat panel 11 perpendicular with second flat panel 11, also fixedly connected with stiffening plate 13 between third connecting plate 12.1 and the second flat panel 11, second bolt hole 4 interval is seted up in the length direction of fourth connecting plate 12.2.
A bolt 5 is connected between the first bolt hole 3 and the second bolt hole 4.
The top surface of first half circular arc steel sheet 1.1 and the top surface of second half circular arc steel sheet 1.2 are equipped with a plurality of diplopore otic placodes 6 along respective cambered surface direction interval respectively, and the bottom circumference of toper cap 2 is opened has a plurality of otic placode locating holes 7 that correspond with diplopore otic placode 6, and diplopore otic placode 6 passes otic placode locating hole 7 cooperation and is fixed with shackle 8, and shackle 8 is fixed in the otic placode of diplopore otic placode 6 lower part downtheholely.
The first semicircular arc-shaped steel plate 1.1 and the second semicircular arc-shaped steel plate 1.2 are respectively provided with a first telescopic regulator 14 for expanding the first semicircular arc-shaped steel plate 1.1 towards two sides and a second telescopic regulator 15 for expanding the second semicircular arc-shaped steel plate 1.2 towards two sides. The first telescopic regulator 14 comprises screw fixing seats 16 fixed on the inner walls of the two sides of the first half circular arc-shaped steel plate 1.1, screws 17 are fixed on the screw fixing seats 16, an internal thread sleeve 18 is connected between the end parts of the screws 17 on the two sides of the first half circular arc-shaped steel plate 1.1, and an operating rod 19 which is vertical to the axial direction of the internal thread sleeve 18 is fixed on the internal thread sleeve 18; the second telescopic regulator 15 comprises screw fixing seats 16 fixed on the inner walls of the two sides of the second semicircular arc-shaped steel plate 1.2, screws 17 are fixed on the screw fixing seats 16, an internal thread sleeve 18 is connected between the end parts of the screws 17 on the two sides of the first semicircular arc-shaped steel plate 1.1, and an operating rod 19 which is vertical to the axial direction of the internal thread sleeve 18 is fixed on the internal thread sleeve 18.
An inner support 20 is fixed in the steel casing 1, a water stopping cloth 24 is fixed in a gap between the first flat plate 9 and the second flat plate 11 (the water stopping cloth 24 has a slurry stopping effect and can achieve a complete water stopping effect, and interference of water or slurry on the steel casing 1 is avoided), a knife edge supporting leg 21 is arranged at the bottom of the steel casing 1, and the knife edge supporting leg 21 is of a steel plate structure with slopes and the thickness of the knife edge supporting leg is increased from the bottom end to the top end in sequence.
The construction method based on the pile foundation back pressure concrete dado construction auxiliary device comprises the following steps:
1) the method comprises the following steps of adopting a drilling machine with a drill bit 10-20 cm larger than the design size of the pile foundation to perform pile foundation drilling operation to a preset position of the pile foundation and then withdrawing the drilling machine (after pile foundation drilling operation is performed on the drilling machine and when hole collapse occurs in a pile foundation hole 22, adopting an auxiliary tool with the inner diameter smaller than the diameter of the collapsed hole for the steel casing 1, completing assembly and coating a release agent on the surface of the steel casing 1, hoisting the auxiliary tool to the bottom of the collapsed hole through a hoisting machine and basically stabilizing the auxiliary tool, pouring counter-pressure concrete 23 to fill a gap between the steel casing 1 and the wall of the pile foundation hole, hoisting the auxiliary tool integrally before and after the counter-pressure concrete 23 reaches initial setting time point, and finally drilling out the counter-pressure concrete 23 in the design diameter of the pile foundation by the drilling machine once.
2) Adopt the steel to protect 1 internal diameter of a section of thick bamboo and pile foundation design diameter the same auxiliary fixtures, and accomplish and assemble, and pour counter pressure concrete 23 after hoisting auxiliary fixtures to pile foundation hole 22's bottom through the loop wheel machine, hang out auxiliary fixtures wholly around the time point that counter pressure concrete 23 reaches initial set, treat that counter pressure concrete 23 solidifies (when pile foundation hole 22's length surpasses auxiliary fixtures's steel protects a section of thick bamboo 1, after the counter pressure concrete 23 that pours for the first time solidifies, hang auxiliary fixtures up through the loop wheel machine, place in the top of counter pressure concrete 23 that pours for the first time, and with counter pressure concrete 23's that pours for the first time dado coincidence 0.5 ~ 1m, then carry out the second concrete pouring operation in auxiliary fixtures state of being hung, back pressure concrete 23 in the pile foundation design diameter is once driped out to last rig).
In the invention, for the section of the pile hole shallow layer which is easy to collapse: the diameter of the steel casing 1 is the same as the designed diameter of the pile foundation. The assembling of the steel casing 1 and the conical cap 2 is completed in advance to form an auxiliary device, a drilling machine firstly drills to a preset position by adopting a drill bit which is about 10-20 cm larger than the design size of a pile foundation and withdraws from the drilling machine, then the device is sequentially placed at the bottom of the pile, back pressure concrete 23 is poured, the device is integrally lifted before and after the time point that the back pressure concrete 23 reaches initial setting, and finally the construction of the concrete retaining wall is completed;
for the shallow and deep hole collapse treatment sections: the size that steel protects section of thick bamboo 1 adopted is less than pile foundation pore-forming diameter, specifically uses the hole condition of collapsing as the standard. The assembly of the steel pile casing 1 and the conical cap 2 is completed in advance to form an auxiliary device, then the device is placed in a hole of a collapsed pile to touch the bottom and is basically stable, back pressure concrete 23 is poured to fill gaps of a collapsed hole section, the device is integrally lifted out before the back pressure concrete 23 reaches initial setting, a drilling machine drills out the back pressure concrete 23 in a pile diameter of a collapsed hole processing section, and finally the construction of the concrete retaining wall is completed.
The invention has simple and reliable structure and convenient installation, eliminates the hole collapse risk by processing in advance for the shallow hole collapse section which is easy to collapse, not only avoids the expense of hole collapse processing, but also ensures the engineering construction progress, reduces the consumption of concrete for the hole collapse processing section so as to save the construction cost, avoids the collapse processing of workers in the lower hole so as to improve the construction safety, and simultaneously greatly improves the processing speed.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the structure of the present invention in any way. Any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a pile foundation back pressure concrete dado construction auxiliary device which characterized in that: the steel protecting sleeve comprises a steel protecting sleeve (1) and a conical cap (2) fixed at the top of the steel protecting sleeve (1), wherein the steel protecting sleeve (1) is formed by two semicircular arc-shaped steel plates which are respectively a first semicircular arc-shaped steel plate (1.1) and a second semicircular arc-shaped steel plate (1.2); the bolt is characterized in that the end faces of the two sides of the first semicircular arc-shaped steel plate (1.1) are fixedly connected with first connecting portions respectively, the end faces of the two sides of the second semicircular arc-shaped steel plate (1.2) are fixedly connected with second connecting portions respectively, the first connecting portions are provided with first bolt holes (3), the second connecting portions are provided with second bolt holes (4), and bolts (5) are connected between the first bolt holes (3) and the second bolt holes (4).
2. The pile foundation back pressure concrete dado construction auxiliary device of claim 1, characterized in that: the top surface of first half circular arc steel sheet (1.1) and the top surface of second half circular arc steel sheet (1.2) are equipped with a plurality of diplopore otic placodes (6) along respective cambered surface direction interval respectively, the bottom circumference of conical cap (2) is opened has otic placode locating hole (7) that a plurality of and diplopore otic placodes (6) correspond, diplopore otic placode (6) pass otic placode locating hole (7) cooperation and are fixed with shackle (8), shackle (8) are fixed in the otic placode of diplopore otic placode (6) lower part downtheholely.
3. The pile foundation back pressure concrete dado construction auxiliary device of claim 1, characterized in that: the first connecting part comprises a first flat plate (9) fixedly connected to end faces on two sides of a first semi-circular-arc-shaped steel plate (1.1) and a first L-shaped plate (10) fixed to the first flat plate (9) and facing the inner side of the steel casing (1), the first L-shaped plate (10) comprises a first connecting plate (10.1) perpendicular to the first flat plate (9) and a second connecting plate (10.2) perpendicular to the first connecting plate (10.1) and parallel to the first flat plate (9), and the first bolt holes (3) are arranged in the length direction of the second connecting plate (10.2) at intervals;
the second connecting portion include second flat panel (11) of fixed connection in second semicircle arc steel sheet (1.2) both sides terminal surface and be fixed in on second flat panel (11), towards steel protect a section of thick bamboo (1) inboard second L template (12), second L template (12) include with second flat panel (11) vertically third connecting plate (12.1) and with third connecting plate (12.1) perpendicular and with second flat panel (11) parallel fourth connecting plate (12.2), second bolt hole (4) interval is seted up on the length direction of fourth connecting plate (12.2).
4. The pile foundation back pressure concrete dado construction auxiliary device of claim 3, characterized in that: a stiffening plate (13) is fixedly connected between the first connecting plate (10.1) and the first flat panel (9), and a stiffening plate (13) is also fixedly connected between the third connecting plate (12.1) and the second flat panel (11).
5. The pile foundation back pressure concrete dado construction auxiliary device of claim 1, characterized in that: and a first telescopic regulator (14) for expanding the first semicircular arc-shaped steel plate (1.1) to two sides and a second telescopic regulator (15) for expanding the second semicircular arc-shaped steel plate (1.2) to two sides are respectively arranged in the first semicircular arc-shaped steel plate (1.1) and the second semicircular arc-shaped steel plate (1.2).
6. The pile foundation back pressure concrete dado construction auxiliary device of claim 5, characterized in that: the first telescopic regulator (14) comprises screw fixing seats (16) fixed on the inner walls of two sides of a first semicircular arc-shaped steel plate (1.1), screws (17) are fixed on the screw fixing seats (16), an internal thread sleeve (18) is connected between the end parts of the screws (17) on two sides of the first semicircular arc-shaped steel plate (1.1), and an operating rod (19) which is vertical to the internal thread sleeve (18) in the axial direction is fixed on the internal thread sleeve (18); the second telescopic adjuster (15) comprises screw fixing seats (16) fixed on the inner walls of the two sides of the second semi-circular arc-shaped steel plate (1.2), and screw rods (17) are fixed on the screw fixing seats (16).
7. The pile foundation back pressure concrete dado construction auxiliary device of claim 3, characterized in that: interior support (20) are fixed with to steel protects a section of thick bamboo (1), clearance internal fixation between first panel (9) and second panel (11) has stagnant water cloth (24), the bottom of steel protects a section of thick bamboo (1) is cutting edge supporting legs (21), cutting edge supporting legs (21) are for increasing in proper order, have the steel plate structure of slope from the thickness on bottom to the top.
8. The construction method of the pile foundation back pressure concrete dado construction auxiliary device based on the claim 1 is characterized in that: it comprises the following steps:
1) adopting a drilling machine with a drill bit 10-20 cm larger than the designed size of the pile foundation to drill the pile foundation to a preset position of the pile foundation, and withdrawing the drilling machine;
2) the auxiliary tool with the same inner diameter as the designed diameter of the pile foundation is adopted for assembling the steel pile casing (1), the release agent is coated on the surface of the steel pile casing (1), the auxiliary tool is hoisted to the bottom of the pile foundation hole (22) through a crane and then the back pressure concrete (23) is poured, the auxiliary tool is integrally hoisted out before and after the time point that the back pressure concrete (23) reaches initial setting, and the back pressure concrete (23) is solidified.
9. The construction method of the pile foundation back pressure concrete dado construction auxiliary device based on the claim 8 is characterized in that: in the step 1, after the drilling machine performs pile foundation drilling operation, when hole collapse occurs in a pile foundation hole (22), an auxiliary tool with the inner diameter smaller than the diameter of the collapsed hole is adopted for assembling, the auxiliary tool is hoisted to the bottom of the collapsed hole through a hoist and is basically stable, back pressure concrete (23) is poured to fill a gap between the steel casing (1) and the hole wall of the pile foundation hole, the auxiliary tool is integrally hoisted out before and after the time point that the back pressure concrete (23) reaches initial setting, and finally the drilling machine drills away the back pressure concrete (23) in the designed diameter of the pile foundation at one time.
10. The construction method of the pile foundation back pressure concrete dado construction auxiliary device based on claim 8 is characterized in that: in the step 2, when the length of the pile foundation hole (22) exceeds the steel casing (1) of the auxiliary tool, after the first poured counter-pressure concrete (23) is solidified, the auxiliary tool is lifted by a crane, placed above the first poured counter-pressure concrete (23) and overlapped with the retaining wall of the first poured counter-pressure concrete (23) by 0.5-1 m, then the second pouring counter-pressure concrete operation is carried out in the lifted state of the auxiliary tool, and finally the drilling machine drills off the counter-pressure concrete (23) in the designed diameter of the pile foundation at one time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710188625.9A CN106836216B (en) | 2017-03-27 | 2017-03-27 | Pile foundation back-pressure concrete dado construction auxiliary device and construction method thereof |
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| CN201710188625.9A CN106836216B (en) | 2017-03-27 | 2017-03-27 | Pile foundation back-pressure concrete dado construction auxiliary device and construction method thereof |
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| CN106836216B true CN106836216B (en) | 2022-07-05 |
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| CN116356815B (en) * | 2023-04-23 | 2023-10-20 | 中铁隧道局集团有限公司 | Soil deformation and vibration air bag isolation structure for deep soft soil area |
| CN117328797B (en) * | 2023-12-01 | 2024-02-09 | 山西八建集团有限公司 | Pile foundation collapse prevention perforating device for pile foundation construction |
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| CN101634146B (en) * | 2008-07-24 | 2011-01-26 | 邢利奥 | Manually digging hole full-steel cylinder-wall protecting construction device for building pile foundation and construction method thereof |
| CN201300156Y (en) * | 2008-11-25 | 2009-09-02 | 浙江省交通工程建设集团有限公司 | Roundness corrector for steel casing |
| CN104831708A (en) * | 2015-03-20 | 2015-08-12 | 深圳市工勘岩土集团有限公司 | Foundation excavation retaining and protecting cast-in-situ bored pile construction method and equipment thereof |
| CN205742237U (en) * | 2016-06-08 | 2016-11-30 | 中国建筑一局(集团)有限公司 | Deep basal pit construction piping processing apparatus |
| CN206655225U (en) * | 2017-03-27 | 2017-11-21 | 中交第二航务工程局有限公司 | A kind of pile foundation back-pressure concrete guard wall construction auxiliary device |
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