阅读说明：本技术 应用于洞桩法施工中的钢管柱精确定位方法 (Steel pipe column accurate positioning method applied to hole-pile method construction ) 是由 熊志富 唐雄 程汉武 唐能谋 唐忠林 周廷 于 2021-07-09 设计创作，主要内容包括：本发明公开了了应用于洞桩法施工中的钢管柱精确定位方法,包括如下步骤：S1、于孔桩内吊入基础钢筋笼；S2、于基础钢筋笼内搭建安装平台,并对安装平台进行标高及水平度定位,浇筑混凝土至距安装平台上方50cm处；S3、破除安装平台上方浮浆,将定位器吊装于安装平台上,进行对中和调平后,将定位器固定于安装平台上；S4、将钢管柱下端定位安装到定位器上；本发明的钢管柱精确定位方法中,利用基础砼浇筑前于基础钢筋笼上搭建的安装平台来安装定位器,相较于传统定位器的安装过程,减少了凿孔、收平、安装定位锥等步骤,减少了孔下作业次数、作业的时间以及凿孔收平步骤带来的误差,提升了钢管柱的安装效率以及定位精度。(The invention discloses a method for accurately positioning a steel pipe column applied to construction by a hole-pile method, which comprises the following steps of: s1, hoisting a foundation reinforcement cage into the hole pile; s2, building an installation platform in the foundation reinforcement cage, positioning the elevation and levelness of the installation platform, and pouring concrete to a position 50cm above the installation platform; s3, removing floating slurry above the mounting platform, hoisting the positioner on the mounting platform, centering and leveling, and fixing the positioner on the mounting platform; s4, positioning and installing the lower end of the steel pipe column on a positioner; according to the method for accurately positioning the steel pipe column, the positioner is installed by using the installation platform which is built on the foundation reinforcement cage before the foundation concrete is poured, compared with the installation process of the traditional positioner, the steps of hole drilling, flattening, installation of the positioning cone and the like are reduced, the frequency of hole drilling operation, the operation time and errors caused by the hole drilling and flattening steps are reduced, and the installation efficiency and the positioning accuracy of the steel pipe column are improved.)

1. The method for accurately positioning the steel pipe column applied to the construction of the hole-pile method is characterized by comprising the following steps of:

s1, hoisting a foundation reinforcement cage (4) into the hole pile;

s2, building an installation platform in the foundation reinforcement cage (4), positioning the elevation and levelness of the installation platform, and pouring concrete to a position 50cm above the installation platform;

s3, removing floating slurry above the mounting platform, hoisting the positioner (1) on the mounting platform, centering and leveling, and fixing the positioner (1) on the mounting platform;

and S4, positioning and mounting the lower end of the steel pipe column (5) on the positioner (1).

2. The method for accurately positioning the steel pipe column applied to hole-pile method construction according to claim 1, wherein: in step S2, the mounting platform is connected to the circumferential foundation reinforcement cage (4) and the hole pile retaining wall (6).

3. The method for accurately positioning the steel pipe column applied to hole-pile method construction according to claim 1, wherein: in the step S1, the reinforcement between the reinforcement cage (4) and the hole pile retaining wall (6) is required to ensure that the reinforcement cage (4) and the locator (1) do not displace in the subsequent steps.

4. The method for accurately positioning the steel pipe column applied to hole-pile method construction according to claim 1, 2 or 3, wherein: the mounting platform comprises two groups of parallel channel steel (2), and in the step S3, after the locator (1) is centered and leveled, the locator (1) is welded on the two groups of channel steel (2).

5. The method for accurately positioning the steel pipe column applied to hole-pile method construction according to claim 1, 2 or 3, further comprising the steps of:

s5, orifice positioning: evenly set up a plurality of flower basket bolts (7) in the week side of steel-pipe column (5) upper end, the first end of every group flower basket bolt (7) is connected and the second end links to each other with anchor rope (60) on hole pile dado (6) with steel-pipe column (5), adjusts the elasticity of every group flower basket bolt (7), makes steel-pipe column (5) perpendicular to mounting platform.

6. The method for accurately positioning the steel pipe column applied to hole-pile method construction according to claim 4, further comprising the steps of: the positioner (1) comprises an annular bottom plate (11) and a ferry assembly (10) mounted on the upper end face of the bottom plate (11), and in step S3, the lower end face of the bottom plate (11) is welded with the two groups of channel steel (2).

Technical Field

The invention relates to the field of steel pipe column construction, in particular to a steel pipe column accurate positioning method applied to hole-pile method construction.

Background

The construction of subway stations in urban rail transit construction is mostly carried out by adopting a hole-pile method, and the middle pile construction is carried out in a pilot tunnel, and a plurality of steel pipe columns are required to be arranged to form a supporting structure; according to the design, in the construction process of the steel pipe column, a bored pile with the diameter of 1.8m and the depth of 20m is adopted, and a supporting structure is formed by the steel pipe column with the diameter of 1.2m and reinforced concrete in the column; when installing the locator structure of steel-pipe column at the hole bottom, construct and have the following problem:

(1) referring to fig. 5, in the installation process of the conventional locator, firstly, chiseling and leveling operations need to be performed on an installation base surface on a pile foundation at the bottom of a hole, that is, a large hole in the middle and small holes on two sides are chiseled on the top surface of next concrete pouring of the hole to total 3 circular holes; then, a positioning cone plate and a positioning cone (the bottom of the large hole) are required to be installed at the bottom of the hole; finally, the positioner is mounted at the bottom of the hole and is connected with the positioning cone in a positioning mode (refer to CN108571008A, a positioning construction method for steel pipe columns of covered and excavated stations); three times of hole punching operation are needed before and after the positioner is installed, the time of single operation is long, and the construction risk is higher.

(2) In addition, in the process of chiseling and leveling the installation base surface, the operation space in the hole is narrow, the construction risk is high, the chiseling construction difficulty of the special-shaped base surface for installing the positioner is high, and the size and the elevation of the chiseling hole are difficult to control, so that the installation accuracy of the positioner is difficult to meet the design and construction requirements;

in conclusion, the installation and construction steps of the positioner in the existing design are various, multiple hole-drilling operations are needed, the construction risk is high, and the chiseling difficulty of the special-shaped base surface of the positioner is high, so that the installation accuracy of the positioner is difficult to meet the design and construction requirements.

Disclosure of Invention

The invention aims to optimize and adjust the existing positioner by combining the engineering characteristics, the economy of site construction, the construction efficiency, the construction safety and other factors, and designs a novel steel pipe column positioner which has simple structure, convenient construction, easy installation and simpler precision control operation, and a steel pipe column accurate positioning method using the positioner.

The embodiment of the invention is realized by the following technical scheme:

the method for accurately positioning the steel pipe column applied to the construction of the hole pile method comprises the following steps:

s1, hoisting a foundation reinforcement cage into the hole pile;

s2, building an installation platform in the foundation reinforcement cage, positioning the elevation and levelness of the installation platform, and pouring concrete to a position 50cm above the installation platform;

s3, removing floating slurry above the mounting platform, hoisting the positioner on the mounting platform, centering and leveling, and fixing the positioner on the mounting platform;

and S4, positioning and mounting the lower end of the steel pipe column on the positioner.

Preferably, in step S2, the mounting platform is connected to the circumferential foundation reinforcement cage and the hole pile retaining wall.

Preferably, in step S1, reinforcement is required between the reinforcement cage and the hole pile retaining wall to ensure that the reinforcement cage and the positioner are not displaced during the subsequent steps.

Preferably, the mounting platform includes two sets of parallel channel steels, and in step S3, after centering and leveling the locator, the locator is welded to the two sets of channel steels.

Preferably, the following step S5, orifice positioning, is also included: evenly set up a plurality of flower basket bolts in the week side of steel-pipe column upper end, the first end of every group flower basket bolt is connected with the steel-pipe column and the anchor rope on second end and the hole pile dado links to each other, adjusts the elasticity of every group flower basket bolt, makes steel-pipe column perpendicular to mounting platform.

Preferably, the positioner comprises a ring-shaped bottom plate and a ferry assembly mounted on the upper end surface of the bottom plate, and in step S3, the lower end surface of the bottom plate is welded to the two sets of channel steels.

The technical scheme of the embodiment of the invention at least has the following advantages and beneficial effects:

according to the method for accurately positioning the steel pipe column, the positioner is installed by using the installation platform built on the foundation reinforcement cage, pouring and grouting are carried out after the installation platform and the foundation reinforcement cage are installed in place so as to fix the installation platform, then the positioner is fixed on the installation platform after being centered and leveled, the positioner is installed and fixed on foundation concrete, and then the positioner is installed at the lower end of the steel pipe column; compared with the installation process of the traditional positioner, the steps of drilling, flattening, installing the positioning cone and the like are reduced, the times of hole drilling operation, the time of operation and errors caused by the drilling and flattening steps are reduced, and the installation efficiency and the positioning accuracy of the steel pipe column are improved.

Drawings

FIG. 1 is a schematic structural view of a lower end positioning mechanism of a steel pipe column according to the present invention;

FIG. 2 is a schematic view of the positioner of the present invention;

FIG. 3 is a bottom view of the retainer of the present invention;

FIG. 4 is a schematic structural view of an orifice positioning mechanism of the present invention;

FIG. 5 is a schematic structural view of a lower end positioning mechanism comprising a conventional positioner;

icon: 1-a positioner, 10-a ferry component, 11-a bottom plate, 2-channel steel, 3-a pile foundation, 4-a foundation reinforcement cage, 5-a steel pipe column, 50-a joint, 6-a retaining wall, 60-an anchor cable and 7-a turn-buckle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Referring to fig. 1 to 4, the present invention provides a method for accurately positioning a steel pipe column 5 applied to a hole-pile method construction, including the steps of:

s1, installing the foundation reinforcement cage 4 in the hole pile, and installing the foundation reinforcement cage 4 at the bottom of the hole in a hoisting mode, specifically, the method comprises the following steps:

s1.1, when a foundation reinforcement cage 4 is installed, two-point hoisting is adopted, a first hoisting point is arranged at the upper part of a framework, a second hoisting point is arranged at the lower part of the framework, and during hoisting, the first hoisting point is lifted first to slightly lift the framework, and then the first hoisting point and the second hoisting point are hoisted simultaneously; and after the framework leaves the ground, stopping the lifting of the second lifting point, and continuously lifting the first lifting point. Gradually loosening the second lifting point along with the continuous rising of the first lifting point until the framework is vertical to the ground, and stopping lifting;

s1.2, when the diameter of the steel reinforcement cage is larger than 1200m and the length of the steel reinforcement cage is larger than 6m, reinforcing the lifting point, properly increasing stirrups at the lifting point, and controlling the welding quality so as to ensure that the steel reinforcement cage does not deform or fall off during lifting; when the steel bar cage is hung in a hole, the hole diameter needs to be aligned, the steel bar cage is kept vertical, the steel bar cage is lightly placed in the hole slowly, the steel bar cage needs to be slowly placed in the hole after the hole is inserted, the steel bar cage is not suitable for left-right rotation, and the steel bar cage is strictly prevented from swinging to collide the hole wall; if the transfer is stopped in case of obstruction, finding out the reason for processing, and strictly forbidding to improve the landing and forcibly transfer;

s1.3, aligning the center of the foundation reinforcement cage 4 with the designed center position of the hole pile, and welding and positioning the foundation reinforcement cage on a frame or a machine base after repeated checking;

next, the following steps are performed:

s2, building an installation platform in the foundation reinforcement cage 4, positioning and adjusting a marker post and levelness of the installation platform to keep the installation platform horizontal, and then connecting the installation platform with the foundation reinforcement cage 4 and the hole pile retaining wall 6 on the peripheral side, wherein the installation platform can be formed by building metal laths, channel steels or angle steels and the like, in the invention, the installation platform selects two groups of channel steels 2 which are arranged in parallel, and two ends of the two groups of channel steels 2 are welded on anchor rods or steel bars on the foundation reinforcement cage 4 and the hole pile retaining wall 6;

and after the installation platform is built, pouring concrete and tamping until the position 50cm above the installation platform.

S3, breaking floating slurry above the mounting platform until the mounting platform is exposed, hoisting the positioner 1 on the mounting platform, centering and leveling, positioning the positioner 1 at the midpoint of the hole pile, and welding and fixing the positioner 1 on the mounting platform, wherein in some embodiments, bolts can also be used for positioning and connecting with the mounting platform; at this time, the mounting platform is fixed in the foundation concrete formed by the foundation steel bar 4 cages and the grouting.

S4, when the strength of the foundation concrete reaches a preset value, the steel pipe column 5 is installed on the positioner 1 through the lifting appliance, the lower end of the steel pipe column 5 is positioned, and in the process, due to firm positioning connection among the positioner 1, the installation platform, the foundation reinforcement cage 4 and the hole pile retaining wall, the lower end positioning mechanism of the steel pipe column 5 is formed, and positioning is accurate.

In some preferred embodiments, in step S1, reinforcement is required to be performed between the foundation reinforcement cage 4 and the hole pile retaining wall 6, so as to ensure that the reinforcement cage 4 and the positioner 1 are not displaced during the subsequent steps; in addition, the foundation reinforcement cage 4 itself can be reinforced to prevent deformation.

Referring to fig. 4, in some preferred embodiments, the method further includes step S5, positioning the upper end of the steel pipe column 5, i.e. the orifice positioning mechanism: the circumferential sides of the upper ends of the steel pipe columns 5 are uniformly provided with a plurality of turn buckle bolts 7, 4 groups are provided in the embodiment, the first end of each group of turn buckle bolts 7 is connected with the steel pipe columns 5, the second end of each group of turn buckle bolts is connected with the anchor cable 60 on the hole pile retaining wall 6, and the tightness of each group of turn buckle bolts 7 is adjusted to enable the steel pipe columns 5 to be perpendicular to the installation platform.

In the above embodiment, the positioner 1 includes the annular bottom plate 11 and the ferry assembly 10 mounted on the upper end surface of the bottom plate 11, in this embodiment, the ferry assembly 10 includes four sets of ferry plates circumferentially arrayed around the axis of the bottom plate 11, an included angle between two adjacent sets of ferry plates is 90 °, and in step S3, the lower end surface of the bottom plate 11 is welded to the two sets of channel steels 2.

And S6, pouring concrete inside and outside the positioned steel pipe column 5.

And S7, after the concrete is solidified and reaches the preset strength, forming, and finishing the installation of the steel pipe column 5.

According to the method for accurately positioning the steel pipe column 5, the positioner 1 can be installed only by one hole-punching operation, so that the labor intensity is reduced, and the installation efficiency is improved.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.