CN106480901B - Precise positioning method for lattice type steel stand column - Google Patents
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention provides a method for accurately positioning a lattice type steel upright, which comprises the steps of sleeving a device with a vertical leveling bubble at the center at the top end of the lattice type steel upright by using the device with the vertical leveling bubble at the center when the lattice type steel upright is inserted to a designed elevation quickly, enabling the vertical leveling bubble to be positioned at the center of the lattice type steel upright, and observing whether the bubble at the center of the device is positioned at the center so as to determine the verticality of the lattice type steel upright; and meanwhile, a north pointer device which is larger than the outer contour of the lattice type steel upright and is provided with a dial in the center is adopted to observe whether the reading of the north pointer to the dial is consistent with a preset value or not, so that the positioning of four limbs of the lattice type steel upright is determined. The method comprises the steps of positioning the verticality of the lattice type steel stand column and positioning the four limbs of the lattice type steel stand column, realizes the accurate positioning of the lattice type steel stand column regardless of plane or three-dimensional, and creates conditions for ensuring the construction quality of a tower crane foundation.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to an accurate positioning method of a lattice type steel stand column, which is suitable for positioning construction of the lattice type steel stand column of an inner supporting stand column pile of a deep foundation pit, especially a tower crane foundation of the lattice type stand column pile in the pit.
Background
At present, a tower crane foundation in a deep foundation pit mostly adopts a drilling filling column inserted lattice type steel upright column as a vertical support of a horizontal reinforced concrete support system in the deep foundation pit, a drilling machine is generally adopted to drill a pile hole of the drilling filling pile in the construction of the pile at present, the hole is cleaned after the drilling is finished, then a reinforcement cage is hoisted, and a reinforcement at the top of the reinforcement cage and the lattice type steel upright column are connected in a welding manner and then continuously descend to the design height.
At present, the top position control of lattice steel stand columns adopts a relatively extensive method, the position of the lattice steel stand columns and the verticality of the lattice steel stand columns greatly influence the construction quality of a reinforced concrete tower crane foundation, if the position control is not good, the construction difficulty and the construction quality of increasing welding level and vertical cross braces between the steel lattice steel stand columns are influenced, the thickness of a steel bar protective layer of the tower crane foundation is not enough, the tower crane foundation construction is influenced, the integral stability of the tower crane foundation is also influenced when the tower crane foundation is more serious, and the use safety of the tower crane is influenced.
Through retrieval, the utility model with the Chinese patent publication number of CN201476772U and the application number of CN200920207605.2 discloses a steel upright verticality adjusting monitoring system, which comprises a laser inclinometer, a laser inclinometer installation adjusting frame, a laser target and a data output device; the laser clinometer is installed on laser clinometer installation adjustment frame, laser clinometer installation adjustment frame is used for being connected with the steel lattice column that is surveyed, the laser beam that the laser clinometer was launched is received to the laser target, data output device passes through the data line and is connected with the laser clinometer, receives the data that the laser clinometer monitored in real time.
The automation of the straightness monitoring that hangs down of steel lattice column can only be realized to above-mentioned patent, can't realize steel stand plane and three-dimensional comprehensive location, and entire system cost is higher relatively moreover.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a lattice type steel column accurate positioning method, which mainly comprises the steps of lattice type steel column perpendicularity positioning and lattice type steel column four limb positioning, so that the lattice type steel column can be accurately positioned regardless of planes or three-dimensional, and conditions are created for ensuring tower crane foundation construction.
In order to achieve the above object, the present invention provides a method for accurately positioning a lattice-type steel column, comprising:
when the lattice type steel upright column is inserted to the designed elevation quickly, the top end of the lattice type steel upright column is sleeved with the bubble device with the vertical leveling in the center, the vertical leveling bubble is positioned in the center of the lattice type steel upright column, and whether the bubble in the center of the bubble device is positioned in the center is observed to determine the verticality of the lattice type steel upright column;
observing whether the reading of the compass for the dial is consistent with a preset value by adopting a compass device with the dial in the center, thereby determining the positioning of four limbs of the lattice type steel upright post;
after the verticality of the lattice steel stand column and the positioning of four limbs are determined, a square steel structure sleeve larger than the outer contour of the lattice steel stand column is sleeved at the top of the lattice steel stand column to prevent the lattice steel stand column from rotating and deviating in the process of pouring concrete in the bored pile body.
Preferably, the method comprises the steps of:
firstly, determining the central position of a cast-in-situ bored pile of a pile cap of a tower crane foundation 4 on a hardened terrace by using a total station, and drawing a drilling circle outside the central position according to the drilling diameter of the cast-in-situ bored pile;
secondly, simulating and drawing the outer contour line of the lattice type steel stand column in the drilling circle according to the position of the positioned cast-in-place pile of the tower crane foundation 4 pile cap;
thirdly, sleeving a north arrow device with a dial at the center on the outer contour line position of the simulated drawn lattice type steel stand column, reading the reading value of the north arrow aiming at the dial at the moment, recording the value, and taking the value as a preset value during final positioning of the lattice type steel stand column;
fourthly, according to the construction requirements of the cast-in-situ bored pile, performing the hole forming and reinforcement cage lowering construction of the cast-in-situ bored pile of the pile cap of the tower crane foundation 4 one by one, and manufacturing a lattice type steel upright column at the same time;
fifthly, placing the reinforcement cage of the cast-in-place pile into the pile hole of the cast-in-place pile, stopping the downward placement of the reinforcement cage when the last section of the reinforcement cage of the cast-in-place pile has a residual length, temporarily fixing the reinforcement cage, and performing welding construction at the joint of the lattice type steel upright post and the reinforcement cage;
sixthly, after welding the joint of the reinforcement cage and the lattice steel upright post is finished, immediately continuing to put down the lattice steel upright post along the pile hole;
seventhly, when the lattice type steel upright column is inserted to the designed elevation quickly, sleeving a bubble device with a vertical level at the center on the top end of the lattice type steel upright column, enabling the bubble device to be located at the center of the lattice type steel upright column, observing whether the bubble is located at the center of the bubble device, if the bubble is not located at the center of the bubble device, indicating that the perpendicularity of the lattice type steel upright column has deviation, and adjusting the perpendicularity of the lattice type steel upright column until the bubble is located at the center of the bubble device;
eighthly, after the verticality of the latticed steel upright post is adjusted, sleeving a north arrow device with a dial in the center at the top of the latticed steel upright post, observing whether the reading of the north arrow for the dial is consistent with the preset value of the third step, and if the reading of the north arrow for the dial is different from the preset value of the third step, adjusting the steering of the latticed steel upright post until the reading of the north arrow for the dial in the north arrow device is consistent with the preset value of the third step;
ninthly, after the verticality of the lattice steel stand column and the steering of four limbs are adjusted in place, sleeving a square steel structure sleeve with the outer contour larger than that of the lattice steel stand column at one position of the top of the lattice steel stand column to prevent the lattice steel stand column from rotating and deviating, and continuously lowering the lattice steel stand column until the designed elevation is reached;
and tenth, fixing the square steel structure sleeve until the concrete pouring of the cast-in-situ bored pile is finished and the initial setting of the concrete is finished.
Preferably, the north arrow device with the dial in the center comprises an adjustable support made of stainless steel, the adjustable support is provided with 4 corner sleeves, the device is limited at the top of the lattice type steel upright post, the center of the adjustable support is provided with an azimuth positioner, the azimuth positioner consists of a north arrow with the dial, and the azimuth of four limbs of the lattice type steel upright post is determined according to the reading on the quasi dial through the north arrow.
Preferably, the adjustable support is a square adjustable horizontal support with an angle sleeve, the adjustable horizontal support is 2cm larger than the outer contour of the lattice type steel upright post, and the dial with the north pointer is located in the center of the horizontal support.
Preferably, the central device with the vertical leveling bubble comprises a horizontal support made of stainless steel, a verticality leveling bubble is arranged in the center of the central device with the vertical leveling bubble, the device is placed at the top of the lattice type steel upright post, and the verticality of the lattice type steel upright post is determined by observing that the verticality leveling bubble is positioned in the center of the verticality leveling bubble device.
Preferably, the horizontal bracket is made of stainless steel with the thickness not less than 3mm, so that the center belt vertical level bubble device is integrally positioned on a plane.
Preferably, the square steel structure sleeve is manufactured by processing angle steel, the square steel structure sleeve is composed of a square clamp and a fixing bracket connected with the square clamp, the square clamp is sleeved outside the lattice type steel upright post, and the rotation of the lattice type steel upright post is limited by the fixing bracket.
Preferably, the square steel structure sleeve is 2cm larger than the outer contour of the lattice steel upright.
Preferably, in the fourth step, after the lattice steel column is processed and manufactured, the top of the lattice steel column needs to be cut to ensure that the top of the lattice steel column is on the same horizontal plane.
Compared with the prior art, the invention has the following beneficial effects:
the method comprises the steps of adjusting the verticality of the lattice type steel stand column and positioning the four limbs of the lattice type steel stand column, so that the lattice type steel stand column can be accurately positioned regardless of plane or three-dimensional, and conditions are created for ensuring the construction of a tower crane foundation. The problems that the welding joints of the steel beams of the horizontal connection system between the lattice type steel stand columns are large, welding takes time and materials, welding construction difficulty is large and the like, which are caused by the construction of the lattice type steel stand columns, are inconvenient can be avoided, and the social benefit is obvious.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a north arrow apparatus with a dial in the center according to a preferred embodiment of the present invention;
in the figure: the device comprises an azimuth locator 1, a dial 2, an adjustable horizontal support 3, a north arrow 4 and an angle sleeve 5;
FIG. 2 is a schematic view of a center band vertical level bubble device in accordance with a preferred embodiment of the present invention;
in the figure: a level 6, a bubble 7 and a horizontal bracket 8;
FIG. 3 is a schematic view of a square steel structural sleeve according to a preferred embodiment of the present invention;
in the figure: a square card 9, a fixing bracket 10;
FIG. 4 is a schematic diagram of the simulated positioning of pile holes and lattice steel columns according to a preferred embodiment of the present invention;
in the figure: pile hole 11, pile hole center 12, lattice steel upright 13.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
A precise positioning method for a lattice type steel upright column adopts a north arrow device with a dial in the center as shown in figure 1, a bubble device with a vertical level in the center as shown in figure 2 and a square steel structure sleeve as shown in figure 3; in the method, in the construction process of the lattice type steel upright, when the lattice type steel upright is quickly inserted to a designed elevation, a bubble device with a vertical level at the center is sleeved at the top end of the lattice type steel upright, so that the bubble device is positioned at the center of the lattice type steel upright, and whether bubbles are positioned at the center of the bubble device is observed to determine the verticality of the lattice type steel upright; and meanwhile, a north pointer device which is slightly larger than the outer contour of the lattice type steel upright and is provided with a dial in the center is adopted to observe whether the reading of the north pointer on the dial is consistent with a preset value or not, so that the positioning of four limbs of the lattice type steel upright is determined.
The method is applied to a tower crane foundation of a deep foundation pit project, the tower crane foundation of the project adopts a reinforced concrete bearing platform, the bearing platform is supported by 4 lattice type steel stand columns, and the 4 lattice type steel stand columns are respectively anchored into reinforced concrete at the tops of 4 equidistant cast-in-situ bored piles. In this embodiment, the specific implementation process is as follows:
the first step is as follows: according to the design of a tower crane foundation, determining the central positions of 4 cast-in-situ bored piles on a concrete hard terrace by using a total station, and determining the positions of drilled holes by using paint;
the second step is that: simulating and drawing the outer contour line of the lattice type steel upright column by using paint in the drilling circle according to the positions of the positioned 4 cast-in-situ bored piles;
the third step: sleeving a north arrow device with a dial at the center at the position of an outer contour line of the simulated drawn lattice steel upright column, reading the reading value of the north arrow aiming at the dial at the moment, and recording the value as a preset value during final positioning of the lattice steel upright column;
the fourth step: according to the construction requirements of the cast-in-situ bored piles, hole forming of 4 cast-in-situ bored piles and construction of a lower reinforcement cage are carried out one by one; simultaneously, processing and manufacturing the lattice type steel upright column in a factory, and after the lattice type steel upright column is processed and manufactured, cutting the top of the lattice type steel upright column to ensure that the top of the lattice type steel upright column is on the same horizontal plane;
the fifth step: when the last section of reinforcement cage of the cast-in-place pile is left with 1m of the whole reinforcement cage and is arranged in the pile hole, stopping the lowering of the reinforcement cage, temporarily fixing the reinforcement cage, and performing welding construction at the joint of the lattice type steel upright post and the reinforcement cage;
and a sixth step: after the welding of the joint of the reinforcement cage and the lattice steel upright is finished, the lattice steel upright is continuously put down along the pile hole;
the seventh step: when the lattice steel upright column is inserted to a position which is 30cm away from the designed elevation, the bubble device with the vertical level at the center is sleeved at the top end of the lattice steel upright column, so that the bubble device is positioned at the center of the lattice steel upright column, the verticality of the lattice steel upright column is adjusted until the bubble is positioned at the center of the vertical level bubble device, and the verticality of the lattice steel upright column can be judged as long as the bubble is positioned at the center of the bubble device at the moment because the top of the lattice steel upright column is horizontal;
eighth step: after the verticality of the latticed steel upright post is adjusted, immediately sleeving a north arrow device which is slightly larger than the outer contour of the latticed steel upright post and provided with a dial at the center on the top of the latticed steel upright post, and adjusting the steering of the latticed steel upright post until the reading of the north arrow in the north arrow device is consistent with the preset value obtained in the third step;
the ninth step: after the verticality of the lattice steel stand column and the steering of four limbs are adjusted in place, a square steel structure sleeve larger than the outer contour of the lattice steel stand column is sleeved at the position of 1.0 +/-0.2 m of the top of the lattice steel stand column, the lattice steel stand column is prevented from rotating and deviating, and the lattice steel stand column is continuously placed downwards until the designed elevation is reached;
the tenth step: and fixing the square steel structure sleeve until the concrete pouring of the cast-in-situ bored pile is finished, and completing the initial setting of the concrete.
As shown in fig. 1, as a preferred embodiment, in the third step and the eighth step, the north arrow device with the dial in the center is manufactured by stainless steel to be an adjustable bracket 3, the adjustable bracket 3 is provided with 4 corner sleeves 5, the device can be limited at the top of the lattice steel upright post to prevent the device from sliding off during the test, the center of the adjustable horizontal bracket 3 is provided with an azimuth positioner 1, the azimuth positioner consists of the north arrow 4 with the dial 2, the device is fixed at the top of the lattice steel upright post, and the azimuth of the limbs of the lattice steel upright post is determined by aligning the north arrow 4 with the reading on the dial 2.
As shown in fig. 2, as a preferred embodiment, in the seventh step, the central band vertical leveling bubble device is manufactured into a horizontal bracket 8 by adopting stainless steel, the thickness of the stainless steel is not less than 3mm, and the whole device is ensured to be positioned on a plane; and a verticality leveling bubble 7 is arranged at the center of the vertical leveling bubble device 6 at the center, the device is placed at the top of the lattice type steel upright, and the verticality of the lattice type steel upright is determined by observing that the verticality leveling bubble 7 is positioned at the center of the verticality leveling bubble device.
As shown in fig. 3, in the ninth step, as a preferred embodiment, the square steel structure sleeve is manufactured by processing angle steel; the square steel structure sleeve is composed of square clamps 9 and fixing supports 10 connected with the square clamps 9, the square clamps 9 are sleeved outside the lattice steel upright posts, and the rotation of the lattice steel upright posts is limited through the fixing supports 10.
As shown in fig. 4, as a preferred embodiment, in the first step and the second step, the pile holes 11 and the lattice steel columns 13 can be positioned in a simulation manner, and the four limbs of the lattice steel columns 13 are connected in parallel with the centers 12 of the adjacent pile holes according to the requirement of connecting the four limbs of the lattice steel columns 13 with the centers 12 of the adjacent pile holes, so that the positional relationship of the four limbs of the lattice steel columns 13 is established.
Compared with the method which usually judges the verticality of the lattice type steel stand columns and the four-limb positioning of the lattice type steel stand columns by naked eyes of constructors, the method has the advantages that the accuracy is obviously improved, the inconvenience that the welding joints of the steel beams in the horizontal connection between the lattice type steel stand columns are large, the welding takes time and materials, the welding construction is difficult and the like caused by the construction of the lattice type steel stand columns can be avoided, and the social benefit is obvious.
The above are only some of the preferred embodiments of the present invention, and other embodiments of the present invention, such as changing the above parameters, etc., are well understood and implemented by those skilled in the art.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (9)
1. A method for accurately positioning a lattice type steel upright column is characterized by comprising the following steps:
when the lattice type steel upright column is inserted to the designed elevation quickly, the top end of the lattice type steel upright column is sleeved with the bubble device with the vertical leveling in the center, the vertical leveling bubble is positioned in the center of the lattice type steel upright column, and whether the bubble in the center of the bubble device is positioned in the center is observed to determine the verticality of the lattice type steel upright column;
observing whether the reading of the compass for the dial is consistent with a preset value by adopting a compass device with the dial in the center, thereby determining the positioning of four limbs of the lattice type steel upright post;
after the verticality of the lattice steel upright column and the positioning of four limbs are determined, a square steel structure sleeve larger than the outer contour of the lattice steel upright column is sleeved at the top of the lattice steel upright column to prevent the lattice steel upright column from rotating and deviating in the process of pouring concrete in a drilling and pouring pile body;
the method comprises the following steps:
firstly, determining the central position of a cast-in-situ bored pile of a pile cap of a tower crane foundation 4 on a hardened terrace by using a total station, and drawing a drilling circle outside the central position according to the drilling diameter of the cast-in-situ bored pile;
secondly, simulating and drawing the outer contour line of the lattice type steel stand column in the drilling circle according to the position of the positioned cast-in-place pile of the tower crane foundation 4 pile cap;
thirdly, sleeving a north arrow device with a dial at the center on the outer contour line position of the simulated drawn lattice type steel stand column, reading the reading value of the north arrow aiming at the dial at the moment, recording the value, and taking the value as a preset value during final positioning of the lattice type steel stand column;
fourthly, according to the construction requirements of the cast-in-situ bored pile, performing the hole forming and reinforcement cage lowering construction of the cast-in-situ bored pile of the pile cap of the tower crane foundation 4 one by one, and manufacturing a lattice type steel upright column at the same time;
fifthly, placing the reinforcement cage of the cast-in-place pile into the pile hole of the cast-in-place pile, stopping the downward placement of the reinforcement cage when the last section of the reinforcement cage of the cast-in-place pile has a residual length, temporarily fixing the reinforcement cage, and performing welding construction at the joint of the lattice type steel upright post and the reinforcement cage;
sixthly, after welding the joint of the reinforcement cage and the lattice steel upright post is finished, immediately continuing to put down the lattice steel upright post along the pile hole;
seventhly, when the lattice type steel upright column is inserted to the designed elevation quickly, sleeving a bubble device with a vertical level at the center on the top end of the lattice type steel upright column, enabling the bubble device to be located at the center of the lattice type steel upright column, observing whether the bubble is located at the center of the bubble device, if the bubble is not located at the center of the bubble device, indicating that the perpendicularity of the lattice type steel upright column has deviation, and adjusting the perpendicularity of the lattice type steel upright column until the bubble is located at the center of the bubble device;
eighthly, after the verticality of the latticed steel upright post is adjusted, sleeving a north arrow device with a dial in the center at the top of the latticed steel upright post, observing whether the reading of the north arrow for the dial is consistent with the preset value of the third step, and if the reading of the north arrow for the dial is different from the preset value of the third step, adjusting the steering of the latticed steel upright post until the reading of the north arrow for the dial in the north arrow device is consistent with the preset value of the third step;
ninthly, after the verticality of the lattice steel stand column and the steering of four limbs are adjusted in place, sleeving a square steel structure sleeve with the outer contour larger than that of the lattice steel stand column at one position of the top of the lattice steel stand column to prevent the lattice steel stand column from rotating and deviating, and continuously lowering the lattice steel stand column until the designed elevation is reached;
and tenth, fixing the square steel structure sleeve until the concrete pouring of the cast-in-situ bored pile is finished and the initial setting of the concrete is finished.
2. The method of claim 1, wherein in the fourth step, after the lattice steel column is manufactured, the top of the lattice steel column is cut to ensure that the top of the lattice steel column is on the same horizontal plane.
3. The method of claim 1, wherein the pile holes and the lattice steel columns are simulated and positioned, and the position relationship of the four limbs of the lattice steel column is determined by the position relationship of the centers of the four pile holes according to the condition that the four limbs of the lattice steel column must be parallel to the center connecting line of the adjacent pile holes.
4. A method for accurately positioning a lattice steel column according to any one of claims 1-3, wherein the north-pointing device with a dial at the center comprises an adjustable bracket made of stainless steel and provided with 4 corner sleeves, so that the device is limited at the top of the lattice steel column, and an azimuth positioner is arranged at the center of the adjustable bracket and consists of a north-pointing needle with a dial, and the azimuth of four limbs of the lattice steel column is determined by reading on the quasi-dial through the north-pointing needle.
5. The method for accurately positioning the lattice steel upright post according to claim 4, wherein the adjustable bracket is a square adjustable horizontal bracket with a corner sleeve, the adjustable horizontal bracket is 2cm larger than the outer contour of the lattice steel upright post, and the dial with a north arrow is positioned at the center of the horizontal bracket.
6. A method as claimed in any one of claims 1 to 3, wherein the central vertically level bubble means comprises a horizontal support made of stainless steel, a vertically level bubble is arranged in the centre of the central vertically level bubble means, the means is placed on top of the steel column, and the verticality of the steel column is determined by observing that the vertically level bubble is in the centre of the vertically level bubble means.
7. The method of claim 6, wherein the thickness of the stainless steel of the horizontal bracket is not less than 3mm, so as to ensure that the center belt vertical level bubble device is entirely positioned on a plane.
8. The method as claimed in any one of claims 1 to 3, wherein the square steel structure sleeve is made of angle steel, the square steel structure sleeve is composed of square clips and fixing brackets connected with the square clips, the square clips are sleeved outside the lattice steel columns, and the rotation of the lattice steel columns is limited by the fixing brackets.
9. The method of claim 8, wherein the square steel sleeve is 2cm larger than the outer profile of the lattice steel column.
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| CN109025328A (en) * | 2018-08-21 | 2018-12-18 | 中国十七冶集团有限公司 | A kind of degree control method in lattice column work progress |
| CN111851517A (en) * | 2020-07-02 | 2020-10-30 | 武汉安振岩土工程有限公司 | Accurate installation method of steel lattice column applied to foundation pit supporting engineering |
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| CN101240550A (en) * | 2007-12-26 | 2008-08-13 | 浙江省长城建设集团股份有限公司 | Construction method for lattice type steel column tower crane pedestal |
| CN201173778Y (en) * | 2008-03-18 | 2008-12-31 | 付敏 | Wall building controller |
| CN103485360A (en) * | 2013-10-12 | 2014-01-01 | 中建八局第三建设有限公司 | Steel platform tower crane foundation and construction method thereof |
| CN105625424A (en) * | 2015-12-21 | 2016-06-01 | 济南轨道交通集团有限公司 | Device used for controlling perpendicularity and azimuth angle of rectangular bracket pile and construction method |
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- 2016-09-29 CN CN201610873547.1A patent/CN106480901B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101240550A (en) * | 2007-12-26 | 2008-08-13 | 浙江省长城建设集团股份有限公司 | Construction method for lattice type steel column tower crane pedestal |
| CN201173778Y (en) * | 2008-03-18 | 2008-12-31 | 付敏 | Wall building controller |
| CN103485360A (en) * | 2013-10-12 | 2014-01-01 | 中建八局第三建设有限公司 | Steel platform tower crane foundation and construction method thereof |
| CN105625424A (en) * | 2015-12-21 | 2016-06-01 | 济南轨道交通集团有限公司 | Device used for controlling perpendicularity and azimuth angle of rectangular bracket pile and construction method |
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