CN213358626U - Hard rock stratum upright post pile construction system for urban sensitive area - Google Patents
Hard rock stratum upright post pile construction system for urban sensitive area Download PDFInfo
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- CN213358626U CN213358626U CN202021821141.7U CN202021821141U CN213358626U CN 213358626 U CN213358626 U CN 213358626U CN 202021821141 U CN202021821141 U CN 202021821141U CN 213358626 U CN213358626 U CN 213358626U
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Abstract
The utility model belongs to the technical field of subway foundation ditch construction, concretely relates to hard rock stratum stand pile construction system in city sensitive area, it includes the wall of leading, along a plurality of slotted holes that the wall distributes, install pile foundation in the slotted hole, install the stand at pile foundation center, the pile foundation includes that the cross section is rectangular steel reinforcement cage, with stand welded connection on the steel reinforcement cage width direction, the pouring has the concrete that is used for filling the space and stabilizes pile foundation and stand in the slotted hole, through above-mentioned structural design, is the rectangle cross-section with pile foundation cross-section, has reduced the material quantity, adopts the double round to mill to be under construction, has reduced the noise pollution in the work progress, has improved the efficiency of construction.
Description
Technical Field
The utility model belongs to the technical field of subway foundation ditch construction, concretely relates to city sensitive zone hard rock stratum upright post pile construction system.
Background
The subway station is built in an old city area of a city, the construction site is narrow, buildings around the station are dense, the foundation pit is close to the buildings on two sides, the station construction has serious influence on the surrounding environment, particularly close to a sensitive area of a hospital, and the requirements on construction vibration and noise are strict.
In the subway foundation pit in a complex environment, a station digging mode of cover digging or half cover digging is generally adopted, and the upright post pile is used as a component of a foundation pit supporting system and is used for bearing the vertical load of the supporting system and increasing the stability of the whole supporting system. The pile foundation of the pile body of the upright post is usually designed into a circular section, and the construction is carried out by adopting a percussion drill or a rotary drilling drill according to the section form, and the structural form and the construction method have the following four defects: (1) the construction in a hard rock stratum, particularly the drilling construction with an inclined rock face, is easy to cause deviated holes, and a reinforcement cage and a lattice column cannot enter at the later stage; (2) when the upright post pile is constructed by adopting the impact drill or the rotary excavator, the hole forming work efficiency in the hard rock stratum is slow, the construction noise of the rotary excavator is high, particularly the soil throwing sound is high, and the construction requirement of the hard rock stratum in the sensitive region of a city cannot be met; (3) the pile foundation concrete guide pipe with the circular section is placed downwards from the lattice column for pouring, and the problems of pipe clamping, pipe burying and the like are easily caused in the pouring process; (4) the latticed column is of a square section steel structure, is not easy to center in a round pile hole, is easy to cause structural deviation of the latticed column, and needs a special centering frame. In view of the above four disadvantages, there is a need for improvements in the sectional form of the stud pile and the construction machine.
Disclosure of Invention
To the above defect of prior art or improve the demand, the utility model aims to provide a be fit for city sensitive area hard rock stratum subway station construction stand pile structure.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a hard rock stratum stand stake construction system in city sensitive area, includes guide wall, along a plurality of slotted holes that guide wall distributes, install pile foundation in the slotted hole, install the stand at pile foundation center, the pile foundation includes that the cross section is rectangular steel reinforcement cage, with stand welded connection on the steel reinforcement cage width direction, the pouring has the concrete that is used for filling the space and stabilizes pile foundation and stand in the slotted hole.
Further, the length of the inside of the cross section of the reinforcement cage is larger than the length of the outside of the cross section of the corresponding stand column, and the width of the inside of the cross section of the reinforcement cage is matched with the width of the outside of the cross section of the corresponding stand column to be welded.
Furthermore, be equipped with the temporary hanging steel reinforcement cage's of detachable component on leading the wall, hang the component and be located the slotted hole top surface.
Furthermore, hanging holes are formed in the guide wall, the hanging component is a steel channel, a plurality of hanging reinforcing ribs are correspondingly distributed on the steel reinforcement cage, and two ends of the steel channel are respectively inserted into the hanging holes in the guide wall and the hanging reinforcing ribs in the steel reinforcement cage.
Furthermore, the shape and the size of the slotted hole are matched with those of the reinforcement cage.
Furthermore, the upright columns are lattice columns, and the length of the lattice columns inserted into the steel reinforcement cage is 50% -60% of the total length of the steel reinforcement cage.
A construction method of a hard rock stratum upright post pile in an urban sensitive area comprises the following steps:
s1: excavating a guide wall, binding reinforcing steel bars, a supporting template and pouring concrete along the excavated guide wall, and reserving a plurality of hanging holes for hanging reinforcement cages on the top surface corresponding to the positions of the excavated slotted holes before pouring the concrete;
s2: milling the groove to a specified depth according to the paying-off mark by adopting a double-wheel mill to form a groove hole;
s3: placing a prefabricated reinforcement cage into the slot hole, and temporarily hanging the reinforcement cage on the guide wall;
s4: hoisting a prefabricated lattice column, inserting the prefabricated lattice column into a reinforcement cage to a preset depth, and firmly welding the lattice column with the reinforcement cage in the width direction;
s5: the temporary hanging is removed, the reinforcement cage and the lattice column are synchronously lowered to a position close to the designated calibration height through a crane, and the lattice column is kept in a free vertical state in the lowering process;
s6: mounting a lattice column correcting frame, adjusting the plane position of the lattice column through the correcting frame, controlling the elevation of the top of the lattice column through a level gauge, and fixing the lattice column firmly after adjusting to a design position;
s7: cleaning holes, positioning and leveling a pouring platform, centering a steel reinforcement cage conduit channel, and pouring underwater concrete;
s8: after the concrete is finally set, the opening is backfilled with coarse sand to fill the gap above the pile top, so that the lattice column is prevented from inclining.
Further, the width of the guide wall in the step S1 is the sum of the foundation width and the construction allowance of 50mm, and the guide wall is excavated by adopting a method combining mechanical excavation and manual finishing.
Further, in the step S2, during the double-wheel milling construction, a guide frame is arranged at the orifice of the double-wheel milling according to the line-releasing mark, the milling head is fixed during the double-wheel milling hole-opening process to play a role of guiding, during the construction, the double-wheel milling vertically enters the groove section, the cutting wheel of the double-wheel milling is aligned with the hole position and slowly enters the groove for cutting, the soil body or the rock body is cut into fragments with the particle size of less than 70mm, the fragments are mixed with the slurry, then the fragments and the slurry solution are pumped out of the groove by a centrifugal pump in the double-wheel milling, and the groove milling construction is carried out until the depth of the pile bottom.
Further, in the step S3, when the cage body of the reinforcement cage enters 80% -90% of the slot hole, the hanging reinforcing rib of the reinforcement cage is aligned with the hanging hole, the reinforcement cage stops being placed, the channel steel penetrates through the hanging reinforcing rib of the reinforcement cage, and the reinforcement cage is erected on the guide wall through the channel steel.
Through the technical scheme, the beneficial effects of the utility model are that:
1) the utility model discloses a rectangular cross section's bar pile basis is as the stand pile foundation, both can shorten the length of pile foundation, reduces stand pile quantity, easy centering when transferring the lattice column, and concrete placement is difficult for the card pipe, when improving the efficiency of construction, satisfies city sensitive area hard rock construction demand, and drilling grooving rectangular cross section aligns easily with lattice column cross-section, need not extra centering device and just can guarantee the installation accuracy of lattice column.
2) The utility model discloses a stand pile structure and construction method thereof, simple structure, construction convenience, construction cost is lower, adopts the double round to mill and carries out the grooving construction, and the construction work efficiency is high, and the construction noise is lower, is fit for in the construction of city sensitive area hard rock stratum.
Drawings
Fig. 1 is a schematic view of the overall structure of a stud pile in the embodiment of the present invention;
fig. 2 is a sectional view taken along the direction a-a of a stud structure according to an embodiment of the present invention;
fig. 3 is a B-B sectional view of a stud structure according to an embodiment of the present invention.
In the figure: 1-pile foundation, 2-upright post and 3-reinforcement cage.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and detailed embodiments are given, but the scope of the present invention is not limited to the following embodiments.
The utility model provides a city sensitive zone hard rock stratum stand stake construction system, as shown in fig. 1-3, including leading wall, along leading a plurality of slotted holes of wall distribution, install pile foundation 1 in the slotted hole, install stand 2 at pile foundation 1 center, pile foundation 1 includes that the cross section is rectangular steel reinforcement cage 3, is formed by a plurality of main muscle and stirrup welding. The reinforcing cage 3 is welded with the upright post 2 in the width direction, the upright post 2 is stabilized in the length direction by pouring concrete, the length of the inside of the cross section of the reinforcing cage 3 is greater than the length of the outside of the cross section of the corresponding upright post 2, so that the foundation is more stable, the width of the inside of the cross section of the reinforcing cage 3 is matched with the width of the outside of the cross section of the corresponding upright post 2 to be welded, so that the reinforcing cage 2 is welded with the upright post 2, and the upright post 2 is stabilized, for convenience of construction, in the embodiment, the cross section of the reinforcing cage 3 is 2.8 meters long and 1 meter wide, the upright post 2 is usually a lattice column, the cross section is square, the side length is slightly less than 1 meter, so that the lattice column can be just inserted into the reinforcing cage 3, the length of the lattice column inserted into the reinforcing cage 3 is 50% -60% of the total length of the reinforcing cage, the depth of the pile foundation 1 embedded into the bottom plate is 5 meters. Concrete for filling gaps and stabilizing the pile foundation 1 and the upright post 2 is poured in the slot holes. The guide wall is provided with a detachable hanging component for temporarily hanging the steel reinforcement cage 3, the hanging component is positioned on the top surface of the slotted hole and can be specifically set to be a hanging hole formed in the guide wall, the hanging component is a channel steel, a plurality of hanging and hanging reinforcing ribs are correspondingly distributed on the steel reinforcement cage 3, two ends of the channel steel are respectively inserted into the hanging hole of the guide wall and the hanging and hanging reinforcing ribs of the steel reinforcement cage 3, and the shape and the size of the slotted hole are matched with those of the steel reinforcement cage 3.
A construction method of a hard rock stratum upright post pile in an urban sensitive area comprises the following steps:
1) and (3) guide wall construction: the width of the guide wall is the width of the foundation plus 50mm of construction allowance, the guide wall is excavated by adopting a method combining mechanical excavation and manual finishing, reinforcing steel bars are bound, a formwork is supported, concrete is poured after the guide wall is excavated, and a plurality of hanging holes for hanging the reinforcing steel bar cage 3 are reserved on the top surface corresponding to the position of the excavated slot hole before the concrete is poured.
2) The method comprises the steps of performing groove milling construction by adopting a groove milling machine, arranging a guide frame at a double-wheel milling hole opening according to a pay-off mark, fixing a milling head in a double-wheel milling hole opening process to play a role in guiding, cutting a cutting wheel of the hydraulic groove milling machine into a groove aligned with a hole position slowly during construction, cutting a soil body or a rock body into fragments of 70-80 mm or smaller, mixing the fragments with slurry, and pumping the fragments and the slurry solution out of a centrifugal pump in the hydraulic groove milling machine to form the groove. Performing groove milling construction until the depth of the pile bottom;
3) the prefabricated reinforcement cage 3 is hung in the slot hole, the reinforcement cage 3 is hung on the guide wall temporarily, when the cage body of the reinforcement cage 3 enters 80% -90% of the slot hole, the hanging reinforcing ribs of the reinforcement cage 3 are aligned with the hanging hole, the reinforcement cage 3 is stopped to be put down, the channel steel penetrates through the hanging reinforcing ribs of the reinforcement cage 3, and the reinforcement cage 3 is erected on the guide wall through the channel steel;
4) hanging a prefabricated lattice column, inserting the prefabricated lattice column into the reinforcement cage 3 by a preset depth, inserting the prefabricated lattice column into the reinforcement cage by 32.5-3 m, and firmly welding the four sides of the lattice column with longitudinal bars of the reinforcement cage 3 by adopting steel bars;
5) synchronously lowering the reinforcement cage 3 and the lattice column to a position close to the designated elevation by a crane;
6) mounting a lattice column correcting frame, adjusting the plane position of the lattice column through the correcting frame, controlling the elevation of the top of the lattice column through a level gauge, and fixing the lattice column firmly after adjusting to a design position;
7) cleaning holes, positioning and leveling a pouring platform, centering a conduit channel of the steel reinforcement cage 3, pouring underwater concrete, controlling pouring speed and preventing the lattice column from floating upwards.
8) After the concrete is finally set, coarse sand is backfilled at the opening of the groove hole to fill the gap above the pile top, so that the lattice column is prevented from inclining.
Through the structural design, the basic section of the middle upright post 2 is changed into a rectangular section, so that the material consumption is reduced. And the double-wheel milling is adopted for carrying out the foundation construction of the stand column 2, so that the noise pollution in the construction process is reduced, and the construction efficiency is improved.
Claims (6)
1. The utility model provides a hard rock stratum stand stake construction system in city sensitive area, its characterized in that, includes guide wall, along a plurality of slotted holes that guide wall distributes, install pile foundation in the slotted hole, install the stand at pile foundation center, the pile foundation includes that the cross section is rectangular steel reinforcement cage, with stand welded connection on the steel reinforcement cage width direction, the pouring has the concrete that is used for filling the space and stabilizes pile foundation and stand in the slotted hole.
2. The system for constructing the stud piles in the hard rock formations of the urban sensitive areas as claimed in claim 1, wherein the internal length of the cross section of the reinforcement cage is greater than the external length of the cross section of the corresponding stud, and the internal width of the cross section of the reinforcement cage is matched with the external width of the cross section of the corresponding stud to be welded.
3. The system for constructing the stud pile in the hard rock formation of the urban sensitive area as claimed in claim 1, wherein the guide wall is provided with a detachable hanging member for temporarily hanging the reinforcement cage, and the hanging member is positioned on the top surface of the slotted hole.
4. The system for constructing the stud pile in the hard rock formation of the urban sensitive area as claimed in claim 3, wherein the guide wall is provided with a hanging hole, the hanging member is a channel steel, the reinforcement cage is correspondingly distributed with a plurality of hanging reinforcing ribs, and two ends of the channel steel are respectively inserted into the hanging hole of the guide wall and the hanging reinforcing ribs of the reinforcement cage.
5. The system for constructing the stud pile in the hard rock formation of the urban sensitive area as claimed in claim 1, wherein the shape and the size of the slotted hole are matched with those of the steel reinforcement cage.
6. The system for constructing the upright post pile in the hard rock formation of the urban sensitive area as claimed in claim 1, wherein the upright post is a lattice post, and the length of the lattice post inserted into the steel reinforcement cage is 50% -60% of the total length of the steel reinforcement cage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021821141.7U CN213358626U (en) | 2020-08-27 | 2020-08-27 | Hard rock stratum upright post pile construction system for urban sensitive area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021821141.7U CN213358626U (en) | 2020-08-27 | 2020-08-27 | Hard rock stratum upright post pile construction system for urban sensitive area |
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| CN213358626U true CN213358626U (en) | 2021-06-04 |
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| CN202021821141.7U Active CN213358626U (en) | 2020-08-27 | 2020-08-27 | Hard rock stratum upright post pile construction system for urban sensitive area |
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- 2020-08-27 CN CN202021821141.7U patent/CN213358626U/en active Active
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