CN112195917A

CN112195917A - Steel upright column deviation rectifying method in one-column one-pile construction

Info

Publication number: CN112195917A
Application number: CN202011044333.6A
Authority: CN
Inventors: 胡晓虎; 江中华
Original assignee: Captain Shanghai Geotech Co ltd; China Railway Siyuan Survey and Design Group Co Ltd
Current assignee: Captain Shanghai Geotech Co ltd; China Railway Siyuan Survey and Design Group Co Ltd
Priority date: 2020-09-28
Filing date: 2020-09-28
Publication date: 2021-01-08

Abstract

The invention relates to a steel upright column deviation rectifying method in one-column-one-pile construction, wherein a steel upright column is rectified in a guide pipe, a first inclinometer is arranged on the steel upright column, a plurality of positions on the upper end of the steel upright column in the circumferential direction are connected with the upper end of a first jack which is vertically arranged, the lower end of the first jack is connected with the upper end of a guide pipe, according to the reading of the first inclinometer, the first jack is controlled to drive the steel upright post to adjust the verticality, in the construction process, because the first inclinometer is added for detecting the inclination of the steel upright column, the reading of the first inclinometer and the position of the steel pipe column have mathematical correspondence, the specific deviation direction and the deviation distance can be calculated and obtained, the accuracy is 0.01 degrees and 0.1mm, the inclination of the steel stand column is adjusted through the matching of the jack, so that the verticality deviation can be further corrected, the whole structure is simple and clear, and the efficiency of the construction process is controllable.

Description

Steel upright column deviation rectifying method in one-column one-pile construction

Technical Field

The invention relates to a deviation rectifying method in steel upright column construction, in particular to a steel upright column deviation rectifying method in one-column-one-pile construction.

Background

One column and one pile are widely applied to ultra-deep and ultra-large foundation pits, cover-excavation reverse-construction foundation pits and subway transfer station foundation pits. One column and one pile means that in the pile foundation, one large-diameter pile of each upright column bears, and is called one column and one pile. The guide pipe inserting method for steel upright is one of the methods of one-column-one-pile construction, and includes fixing guide pipe for guiding steel upright inside pile hole to limit the deviation range of steel upright in the inserting process and reduce the deflection of steel upright, fixing guide pipe inside pile hole with erecting platform, centering with erecting platform, pouring concrete to the bottom of pile hole, inserting steel upright into concrete from guide pipe and positioning until the poured pile is finally set, detaching guide pipe and erecting platform, installing steel upright top fixing device, refilling and pulling out protecting cylinder. In the construction process, on one hand, the concrete is easy to generate vertical deviation in the inserting process, and on the other hand, the stress generated in the solidification process of the concrete can also have adverse effects on the verticality of the upright post. Once the stand can't effectively ensure the straightness standard that hangs down in this in-process, then can influence subsequent engineering.

Disclosure of Invention

The invention mainly aims to provide a construction method capable of improving the perpendicularity of a steel upright and reducing the vertical deviation of the steel upright.

In order to achieve the purpose, the invention provides a steel upright column deviation rectifying method in column-pile construction, wherein a steel upright column is rectified in a guide pipe, a first inclinometer is arranged on the steel upright column, a plurality of positions in the circumferential direction of the upper end of the steel upright column are connected with the upper end of a first jack which is vertically arranged, the lower end of the first jack is connected with the upper end of the guide pipe, and the first jack is controlled to drive the steel upright column to adjust the verticality according to the reading of the first inclinometer.

In some embodiments, the steel upright is provided with a limiting steel plate on the inner peripheral side of the guide pipe, and the limiting steel plate is used for centering and limiting the upright in the guide pipe.

In some embodiments, the offset distance of the steel column from the first inclinometer position is calculated by the following formula:

σ＝L×tanα

wherein, the obtained sigma is the deviation distance of the steel upright post at the position of the first inclinometer, alpha is the inclination angle measured by the inclinometer, L is the distance from the first jack to the first inclinometer,

and when the verticality is adjusted, each first jack is controlled to lift, and the steel upright is driven to adjust the verticality in a deviation distance obtained by the position of the first inclinometer relative to the inclination angle reverse swing calculation.

In some embodiments, the pile hole in a pile-on-pile construction is formed by downward rotary excavation after inserting the casing into the original soil layer.

In some embodiments, the pile core deviation between the pile casing center and the pile hole is less than or equal to 20 mm; the verticality deviation between the pile casing and the pile hole is less than or equal to 1 percent.

In some embodiments, the upper part of the guide pipe is fixed in the pile hole by centering an erection platform arranged above the pile hole, and the lower part of the guide pipe is regulated to be vertical by a water-bottom vertical regulating mechanism.

In some embodiments, the underwater verticality adjusting mechanism comprises a plurality of underwater jacks arranged along the periphery of the guide pipe, one end of each underwater jack is fixed on the side surface of the guide pipe, the other end of each underwater jack is in contact with the inner wall of the pile hole, and the underwater jacks are pushed and pulled transversely relative to the lower part of the guide pipe to adjust the verticality of the guide pipe.

In some embodiments, the leveling step of the erection platform is further included, a second inclinometer is arranged on the erection platform, the second inclinometer is connected with the upper end of a second jack which is vertically arranged at a plurality of positions on the peripheral side of the erection platform, the lower end of the second jack is connected with the ground, and the second jack is controlled to drive the erection platform to level according to the reading of the second inclinometer.

In some embodiments, a first positioning member is disposed on the erection platform, a second positioning member engaged with the first positioning member is disposed on the guide tube, and the guide tube is aligned by engagement of the first positioning member and the second positioning member.

Compared with the prior art, the invention has the advantages that the first inclinometer is added for detecting the inclination of the steel stand column in the construction process, the specific deviation direction and the deviation distance can be calculated and obtained by the mathematical correspondence between the reading of the first inclinometer and the position of the steel pipe column, the deviation is accurate to 0.01 degrees and 0.1mm, the inclination of the steel stand column is adjusted by matching the jack, the verticality deviation can be further corrected, the whole structure is simple and clear, and the construction efficiency is high.

Drawings

Fig. 1a and 1b are schematic views of the construction process of the invention.

Fig. 2 is a schematic view of an installation structure among the pile casing, the guide pipe, the steel upright, the limiting steel plate and the erection platform.

FIG. 3 is a schematic view of the guiding tube verticality adjusting process.

FIG. 4 is a schematic diagram of the ultrasonic retesting of the verticality of the guide tube.

Fig. 5 is a schematic top view of a steel column in a deflected state.

In the figure: 1. the steel bar cage type hydraulic support comprises a protective cylinder, 2 a steel bar cage, 3 an erection platform, 4 a second jack, 5 a second inclinometer, 6 a guide pipe positioning I-steel, 7 a guide pipe, 8 an underwater jack, 9 a steel upright post, 10a first jack, 11 a limiting steel plate, 12 an ultrasonic detector, 13 a guide pipe, 14 an underwater slurry pump, 15 a steel upright post top fixing device, 16 a first inclinometer, 17 a flange, 18 a second baffle and 19 a first baffle.

Detailed Description

The invention is further described with reference to the following figures and examples.

The "design pile center" described in this embodiment is the central axis position of the steel column in the previous design.

The descriptions of orientations in this embodiment, such as "up", "down", "left", and "right", are relative positions rather than absolute positions.

The construction method of one column and one pile in the embodiment is shown in fig. 1a, 1b and 2, and mainly comprises the following steps:

the reinforcement cage 2 is put down to the bottom of a pile hole, the pile hole is formed by inserting a pile casing 1 into an original soil layer and then performing downward rotary digging, the upper end of the inserted pile casing 1 is higher than the ground by a certain distance, one of the available distances is 0-50cm, after the pile hole is formed by rotary digging, the deviation of the center of the pile casing 1 and the pile core is not more than 20mm, the deviation of the verticality is not more than 1%, the pile casing 1 and the hole wall of the pile hole are compacted by clay soil in a squeezing mode, and the diameter ratio of the pile casing 1 is more than 20cm larger than the diameter of the pile.

The erection platform 3 is hoisted to the upper part of the pile casing, the initial positioning and fixing of the erection platform 3 are carried out, and the erection platform 3 is adjusted to be in a horizontal state by the erection platform 3 through the second jack 4 and the second inclinometer 5. Referring to fig. 2, the adjustment manner in this embodiment is to provide four second jacks 4 for vertical jacking on the ground along the peripheral side of the erection platform 3, the number of the second jacks 4 may be more or less, such as three, five, six, but should be at least three, generally three jacks can adjust the levelness of the erection platform 1, and more jacks mean finer adjustment. Further, the second jacks 4 should be arranged at equal intervals in this embodiment, so as to facilitate the adjustment process. In order to provide an acting point for jacking the second jacks 4, second baffle plates 18 are arranged above the second jacks 4 in the circumferential direction of the erection platform 3, the second jacks 4 are used for jacking the second baffle plates 18 to adjust the height of the edges of the erection platform 3 at the positions, and the leveling of the erection platform 3 is realized by adjusting the height of each position of the erection platform through each jack. The main function of the erection platform 3 is to fix and adjust the guide pipe 7, and a good foundation can be laid for adjusting the verticality of the guide pipe 7 later by leveling the erection platform 3, so that the guide pipe 7 has a small verticality deviation when erected on the erection platform 3. The erection platform 3 should have a space thereon to allow the guide tube 7 to be inserted into the pile hole.

Erect platform 3 on be provided with first locating piece, be provided with on the stand pipe 7 with first locating piece complex second locating piece, the stand pipe realizes the centering through the cooperation of first locating piece and second locating piece. Referring to fig. 1a and 2, a guide pipe positioning i-beam 6 serving as a first positioning member is installed on the erection platform 3 by measurement, in order to enable the guide pipe 7 to be erected on the guide pipe positioning i-beam 6, a transverse flange 17 serving as a second positioning member is arranged at the upper end of the guide pipe 7, and after the guide pipe 7 is inserted into a pile hole, the flange can abut against the i-beam 6 to support and position the guide pipe, so that the guide pipe positioning i-beam 6 is fixed after the center of the guide pipe 7 is consistent with the center X of a designed pile, wherein the fixing can be threaded fixing or welded fixing.

The lower part of the guide pipe 7 is regulated to be vertical through a water vertical regulating mechanism. The underwater verticality adjusting mechanism comprises a plurality of underwater jacks arranged along the peripheral sides of the guide pipes, one ends of the underwater jacks are fixed on the side faces of the guide pipes, the other ends of the underwater jacks are in contact with the inner walls of the pile holes, and the verticality of the guide pipes is adjusted by horizontally pushing and pulling the underwater jacks to the lower portions of the guide pipes. As shown in the figure 1a, the figure 2 and the figure 3, four underwater jacks 8 are arranged between the four side surfaces of the lower part of the guide pipe 7 and the inner wall of the casing 1, and the perpendicularity of the guide pipe 7 is adjusted to 1/1000-1/3000 by the four underwater jacks 8 through transverse push-pull. And the perpendicularity of the guide tube 7 is remeasured using an ultrasonic probe 12 (fig. 5).

Referring to fig. 1a, a catheter 13 for perfusion is lowered from the guide tube 7 to the bottom of the rebar cage.

The underwater mud pump 14 is used for secondary hole cleaning operation.

And cleaning the holes to finish pouring the retarded concrete.

As shown in fig. 1b, after the steel upright 9 is hoisted and inserted into concrete, the steel upright is corrected, a first inclinometer 16 is arranged on the steel upright, a plurality of circumferential positions at the upper end of the steel upright are connected with the upper end of a vertically arranged first jack 10, and the lower end of the first jack 10 is fixed with the upper end of the guide pipe 7. As shown in fig. 5, in the embodiment, four first jacks are provided, the number of the first jacks 10 may be more or less, such as three, five or six, but should be at least three, generally three first jacks can adjust the levelness of the steel column 9, and more first jacks mean finer adjustment. Further, the first jacks 10 of the present embodiment should be arranged at equal intervals, so as to facilitate the adjustment process. The mode of setting can refer to fig. 2, the pipe upper end is located the both sides frame of steel stand and is equipped with the I-steel, the lower extreme of first jack 10 is fixed and is realized fixing for the pipe on the I-steel, week side on the steel stand 9 upper end has the first baffle 19 that provides the impetus for first jack 10, the steel stand of this side is lifted or is descended in the below of first baffle 19 to the upper end of first jack 10, thereby the gradient of adjustment steel stand, and according to the reading of first inclinometer 16, control first jack 10 drives steel stand 9 and transfers and hang down. The steel stand is provided with spacing steel sheet 11 on the week side in the stand pipe, and spacing steel sheet 11 is used for spacing between two parties to the steel stand in the stand pipe, and in this embodiment, the setting mode of spacing steel sheet 11 is as shown in fig. 2, and spacing steel sheet 11 passes through the angle steel and sets up perpendicularly on the week side of steel stand, and four angle steels weld respectively and form the rectangle frame at the steel stand outer wall, and have 0.5-5 mm's clearance between the inner wall of rectangle frame and stand pipe. The position of the steel upright post 9 is limited on the guide pipe 7 through a limiting steel plate 11 so as to realize central positioning.

With reference to the reading of the first inclinometer 16 mounted on the steel upright 9, the deviation distance is obtained using the mathematical relationship between the reading and the inclination attitude of the steel upright:

σ＝L×tanα

the obtained sigma value is the deviation distance of the position of the first inclinometer, the position of the first inclinometer is coincided with the center of the designed pile column through the length of swinging the sigma value, alpha is an inclination angle measured by the inclinometer, and L is the distance from the first jack 10 to the first inclinometer 16. And when the verticality is adjusted, adjusting the first jack 10 to enable the steel upright post to adjust the verticality in the position of the first inclinometer relative to the deviation distance obtained by calculating the reverse swinging of the inclination angle.

Specifically describing the step of correcting the deviation with reference to fig. 2 and 5, fig. 5 is a schematic structural diagram of a steel column viewed from above, in this embodiment, the distance from the first jack to the first inclinometer is 4 meters, and referring to the reading of the first inclinometer 16, the lower end of the steel column is offset by 1 ° in the northeast direction of the center drawing of the designed pile, and in order to make the center of the steel column coincide with the center of the designed pile, the bottom end of the steel column needs to be corrected in the southwest direction. At this time, the first jack 10d on the west side and the first jack 10c on the south side should be raised, the first jack 10b on the east side and the first jack 10a on the north side should be lowered, and the correction distance σ can be calculated by trial according to the formula, where σ is 4000mm × tan1 ° and 69.8mm, that is, the first inclinometer position of the steel column should be moved 69.8mm in the southwest direction. Similarly, when the steel column is shifted to the southwest direction in the drawing, the east first jack 10b and the north first jack 10a can be controlled to ascend, and the west first jack 10d and the south first jack 10c can be controlled to descend. For another example, if the lower end of the steel column deviates from the east direction of the center of the designed pile, the east first jack 10b can be controlled to descend, and the west first jack 10d can be controlled to ascend to correct the deviation and adjust the verticality.

And after the concrete is finally set, positioning the steel upright post, dismantling the guide pipe and erecting the platform.

And installing a steel upright top fixing device 15.

Finally, backfilling and pulling out the protective cylinder 1.

The embodiments of the present invention are merely illustrative, and not restrictive, of the scope of the claims, and other substantially equivalent alternatives may occur to those skilled in the art and are within the scope of the present invention.

Claims

1. A steel stand column deviation rectifying method in one-column one-pile construction is characterized in that a first inclinometer is arranged on the steel stand column, a plurality of circumferential positions at the upper end of the steel stand column are connected with the upper end of a vertically arranged first jack, the lower end of the first jack is connected with the upper end of a guide pipe, and the first jack is controlled to drive the steel stand column to adjust the verticality according to the reading of the first inclinometer.

2. The steel column deviation rectifying method according to claim 1, wherein the steel column is provided with a position limiting steel plate on the circumferential side inside the guide tube, and the position limiting steel plate is used for centering and limiting the steel column inside the guide tube.

3. The steel column deviation rectifying method according to claim 1, wherein the deviation distance of the steel column from the first inclinometer position is calculated by the following formula:

σ＝L×tanα

and when the verticality is adjusted, each first jack is controlled to lift, and the steel upright is driven to adjust the verticality in the position of the first inclinometer relative to the deviation distance calculated by the inclination angle reverse swing.

4. The method of claim 1, wherein the pile hole in the pile-on-pile construction is formed by inserting a casing into the soil layer and then performing a downward rotary excavation.

5. The steel column deviation rectifying method according to claim 4, wherein the deviation between the pile core of the pile casing and the pile hole is less than or equal to 20 mm; the verticality deviation between the pile casing and the pile hole is less than or equal to 1 percent.

6. The steel column deviation rectifying method according to claim 4, wherein the upper portion of the guiding tube is centered and fixed in the pile hole by an erection platform disposed above the pile hole, and the lower portion of the guiding tube is adjusted to be vertical by the water-lowering verticality adjusting mechanism.

7. The steel column deviation rectifying method according to claim 6, wherein the underwater verticality adjusting mechanism comprises a plurality of underwater jacks arranged along the periphery of the guide pipe, one end of each underwater jack is fixed on the side surface of the guide pipe, the other end of each underwater jack is in contact with the inner wall of the pile hole, and the verticality of the guide pipe is adjusted by transversely pushing and pulling the lower part of the guide pipe by the underwater jacks.

8. The steel column deviation rectifying method according to claim 6, further comprising a leveling step for the erection platform, wherein a second inclinometer is arranged on the erection platform, a plurality of positions on the periphery of the erection platform are connected with the upper end of a second jack vertically arranged, the lower end of the second jack is connected with the ground, and the second jack is controlled to drive the erection platform to level according to the reading of the second inclinometer.

9. The steel column deviation rectifying method according to claim 6, wherein a first positioning member is disposed on the erection platform, a second positioning member engaged with the first positioning member is disposed on the guide tube, and the guide tube is centered by the engagement of the first positioning member and the second positioning member.