CN115183738A - Vertical displacement monitoring method for deep-buried soil foundation - Google Patents
Vertical displacement monitoring method for deep-buried soil foundation Download PDFInfo
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- CN115183738A CN115183738A CN202210804313.7A CN202210804313A CN115183738A CN 115183738 A CN115183738 A CN 115183738A CN 202210804313 A CN202210804313 A CN 202210804313A CN 115183738 A CN115183738 A CN 115183738A
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- 239000002689 soil Substances 0.000 title claims abstract description 99
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012544 monitoring process Methods 0.000 title claims abstract description 24
- 238000004062 sedimentation Methods 0.000 claims abstract description 36
- 238000012937 correction Methods 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 239000004577 thatch Substances 0.000 claims description 10
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- 238000012806 monitoring device Methods 0.000 description 22
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- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
Abstract
The invention provides a vertical displacement monitoring method of a deep-buried soil foundation, which comprises the following steps: s1, arranging a settlement plate on a soil foundation to be monitored, adjusting the levelness of the settlement plate according to circular level bubbles, and recording the number of grids of the circular level bubbles deviating from the central point of the circular level bubbles; s2, connecting a settlement joint rod to a settlement rod mounting position in a screwing mode, burying a soil body, connecting the settlement joint rod in real time along with the soil body burying thickness, and always keeping the second end head of the settlement rod exposed out of the surface of the soil body; when the landfill is finished, recording the number of the sedimentation rods and obtaining the lengths of the sedimentation rods; s3, calculating the length correction value of the settling rod in the vertical direction according to the number of the grids of the circular level bubbles deviated from the center point of the circular level bubbles and the length of the settling rod; s4, measuring the end head of the second end of the settlement rod to obtain data related to vertical displacement; and calculating the vertical displacement of the foundation of the deep-buried soil body according to the vertical displacement related data and the length correction value of the settlement rod in the vertical direction. The calculation of the vertical displacement measurement value is simpler and more convenient, and is real and reliable.
Description
Technical Field
The invention relates to the technical field of engineering investigation, in particular to a vertical displacement monitoring method for a deep-buried soil foundation.
Background
In civil engineering construction of railways, highways, dams, house buildings and the like, the vertical displacement of the foundation of a deeply buried soil foundation is often monitored. The existing monitoring device has the problem of larger error in direct observation by leading to a soil surface monitoring point when the existing monitoring device is buried at a deep buried soil foundation part.
How to arrange a reliable monitoring devices in the process of soil foundation filling or prepressing loading is an urgent need in the field, and the vertical displacement data of the deeply buried soil foundation can be directly obtained by a measuring means.
Therefore, a method for monitoring the vertical displacement of the deeply buried soil foundation is needed.
Disclosure of Invention
Technical problem to be solved
In view of the problems in the art described above, the present invention is at least partially addressed. Therefore, the invention aims to provide a vertical displacement monitoring method for a deep-buried soil foundation, which enables the calculation of a vertical displacement measurement value to be simpler, more convenient, and more real and reliable.
(II) technical scheme
In order to achieve the purpose, the invention provides a vertical displacement monitoring method of a deep-buried soil foundation, which is realized on the basis of a settlement plate and a plurality of settlement joint rods, wherein a plurality of downwards-pointed thatch tips are uniformly arranged on the first surface of the settlement plate around the center of the settlement plate, a settlement rod mounting position is arranged at the center of the second surface of the settlement plate, round leveling bubbles are embedded in an opening on the second surface of the settlement plate, the plurality of settlement joint rods can be sequentially connected by head and tail threads to form the settlement rod, and the first end of the settlement rod is in threaded connection with the settlement rod mounting position;
the vertical displacement monitoring method of the deep-buried soil foundation comprises the following steps:
s1, arranging a settlement plate on a foundation of a soil body to be monitored, inserting a thatch point into the soil body, adjusting the levelness of the settlement plate according to circular level bubbles, compacting, and recording the number of grids of the circular level bubbles deviating from the central point;
s2, connecting a settlement joint rod to a settlement rod mounting position in a screwing mode, burying a soil body, connecting the settlement joint rod in real time along with the soil body burying thickness, and always keeping the second end head of the settlement rod exposed out of the surface of the soil body; when the landfill is finished, recording the number of the sedimentation rods connected to the sedimentation plate and obtaining the length of the sedimentation rod;
s3, calculating the length correction value of the settling rod in the vertical direction according to the number of the lattices of the circular level bubble deviating from the central point of the circular level bubble and the length of the settling rod;
wherein, the delta H is the length correction value of the settling rod in the vertical direction; l is the length of the settlement rod, and the standard length of a single settlement rod is multiplied by the number of rods to calculate; n is the number of grids of the circular level bubble deviating from the center point, and each grid is counted as one grid when the circular level bubble deviates by 2 mm; a is the inclination angle corresponding to each moving grid of the circular level bubble; ρ is the conversion constant between radian and second values, which is 206265";
s4, measuring the end head of the second end of the settlement rod to obtain data related to vertical displacement; and calculating the vertical displacement of the foundation of the deep-buried soil body according to the vertical displacement related data and the length correction value of the settlement rod in the vertical direction.
As a modification of the method of the present invention, in S1, the number of cells of the circular level bubble from the center point thereof is recorded by visual observation or by a scale.
As an improvement of the method of the invention, in S1, the number of the grids of the circular level bubble deviating from the central point is 0.5-3.0 grids.
As an improvement of the method of the present invention, in S4, the measuring of the second end of the settling rod to obtain data related to vertical displacement includes: and measuring the elevation data of the second end head of the settlement rod by using an optical level, an electronic level or a total station.
As an improvement of the method, in S4, the vertical displacement of the deep-buried soil foundation is calculated according to the related data of the vertical displacement and the length correction value of the settling rod in the vertical direction, and the method comprises the following steps:
H＝H1-L+ΔH
d＝Hn-Hm
h is elevation data of a deep-buried soil foundation settlement plate; h1 is elevation data of the second end head of the settlement rod; hm and Hn are elevation data of the deep-buried soil foundation settlement plate obtained by measurement in different time periods; d is the settlement of the foundation of the deep-buried soil body.
As an improvement of the method, the couch top is conical or frustum-shaped; the settlement plate is square, and the thatch tips are arranged at four corners of the settlement plate.
As an improvement of the method, a male bolt vertical to the sedimentation plate is arranged at the center of the second surface of the sedimentation plate and is used as a sedimentation rod mounting position; correspondingly, the first end of the sedimentation rod is provided with a female bolt sleeve buckle, and the female bolt sleeve buckle is in threaded connection with the sedimentation rod installation position; or a female bolt sleeve buckle perpendicular to the sedimentation plate is arranged at the center of the second surface of the sedimentation plate and serves as a sedimentation rod mounting position; correspondingly, the first end of the settlement rod is provided with a male bolt, and the male bolt is in threaded connection with the settlement rod mounting position.
As an improvement of the method of the invention, each settlement joint rod consists of a female bolt toggle part, a connecting part and a male bolt part which are connected in sequence, wherein the female bolt toggle part is used as the first end of the settlement joint rod, and the male bolt part is used as the second end of the settlement joint rod.
As an improvement of the method, round leveling air bubbles are embedded into the corner of the second surface of the sedimentation plate.
(III) advantageous effects
The invention has the beneficial effects that:
in order to ensure the authenticity and the accuracy of the calculated vertical displacement, the method for monitoring the vertical displacement of the deep-buried soil foundation is realized based on the device for monitoring the vertical displacement of the deep-buried soil foundation, the position change and the form change of a settlement plate in the soil body and the form change of a settlement rod in the soil body do not need to be considered, and only the settlement plate does not strictly stay at the horizontal position and causes the settlement rod to have a certain inclination, so that the total length of the connection settlement rod is lost in the vertical direction, and the calculation of the vertical displacement measured value of the foundation is simpler and more convenient. Therefore, the length of the settling rod is corrected in a mode of measuring the deviation lattice number of the full-water quasi bubbles and quickly calculating the length correction value of the settling rod in the vertical direction, so that the measured value of the vertical displacement of the soil body is corrected, and the measured value of the soil body settling is more real and objective.
Drawings
The invention is described with the aid of the following figures:
fig. 1 is a schematic perspective view of a settling plate according to an embodiment of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic structural view of a settlement joint bar according to an embodiment of the present invention;
FIG. 4 is a schematic view of a vertical displacement monitoring device according to an embodiment of the present invention mounted on a foundation of a soil mass to be monitored;
fig. 5 is a schematic flow chart of a vertical displacement monitoring method according to an embodiment of the invention.
[ instruction of reference ]
1: a settlement plate;
2: a settlement rod mounting position;
3: maojian tea;
4: a circular level bubble;
5: settling the sectional rods; 51: a female bolt buckling part; 52: a male bolt portion; 53: a connecting portion.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present embodiments of the invention, which are illustrated in the accompanying drawings. As used herein, the terms "upper," "lower," "front," "rear," "left," "right," and like terms of orientation refer to the orientation of FIG. 1.
The invention provides a vertical displacement monitoring device for a deep-buried soil foundation. As shown in fig. 1 to 4, the vertical displacement monitoring device for the deep-buried soil foundation comprises a settlement plate 1 and a plurality of settlement joint rods 5, wherein a plurality of downward pointed thatch poles 3 are uniformly arranged on the first surface of the settlement plate 1 around the center of the settlement plate 1, a settlement rod mounting position 2 is arranged at the center of the second surface of the settlement plate 1, the settlement joint rods 5 are sequentially connected with one another through head and tail threads to form a settlement rod, and the first end of the settlement rod is connected with the settlement rod mounting position 2 through threads.
The use process of the vertical displacement monitoring device for the deeply buried soil foundation comprises the following steps: firstly, horizontally arranging a sedimentation plate 1 on a foundation of a soil body to be monitored, enabling a first surface of the sedimentation plate 1 to face downwards, inserting a thatch point 3 into the soil body, and compacting; and then, a settlement joint rod 5 is screwed and connected to the settlement rod mounting position 2, the soil body is buried, the settlement joint rod 5 is continuously connected in real time along with the soil body burying thickness, the second end head of the settlement rod is always exposed out of the surface of the soil body, so that the vertical displacement of the foundation of the deeply buried soil body is reflected on the surface of the soil body, and the measuring equipment obtains the vertical displacement data of the foundation of the deeply buried soil body by measuring the second end head of the settlement rod.
According to the vertical displacement monitoring device for the deep-buried soil foundation, the thatch tips 3 are arranged on the settlement plates 1, so that the position and the form of the monitoring device in the soil can be stably fixed, the problem that the monitoring device rotates or moves when the settlement rod is screwed and connected is solved, the point position is ensured to be stable, the authenticity of the monitoring device for reflecting the vertical displacement of the deep-buried soil foundation is improved, and the vertical displacement data of the deep-buried soil foundation observed by the vertical displacement monitoring device is more real and reliable. Through subsiding festival pole 5 and subsiding 1 threaded connection, and subside festival pole 5 with many and subside head and the tail threaded connection formation in proper order and subside the pole, convenient to detach has improved monitoring devices's structural stability simultaneously, subside the difficult emergence deformation of the part that the pole buries the soil body on the one hand, on the other hand subside the part that the pole exposes the soil body and is difficult for taking place the deformation under the condition that receives external action interference (for example on-the-spot personnel's mistake bump), improve monitoring devices from this and reflect the authenticity of burying soil body ground vertical displacement deeply, and subside the pole that festival pole 5 formed through plug-in connection, its part of burying the soil body and the part of exposing the soil body all easily receive external action and take place the deformation. The vertical displacement monitoring device for the deep-buried soil foundation is simple in structure, can be formed by standard components, and is low in manufacturing cost.
Preferably, the couch tip 3 is conical or frustum-shaped. Further preferably, the tip 3 is conical, as shown in fig. 1 and 2. It is envisaged that a similar effect can be achieved with a pyramidal cusp 3.
Preferably, the settling plate 1 is square, and the couch top 3 is arranged at the four corners of the settling plate 1.
Further preferably, the settlement plate 1 is a square steel plate, the thatch-tip 3 is made of steel, and the thatch-tip 3 is vertically welded on the settlement plate 1. Further, in the embodiment, the length of the sedimentation plate 1 is 30-40 cm, and the thickness is 2.5-3 cm; the welding area of the couch top 3 is 2.5-3 cm 2 The height (i.e., the length in the vertical direction) of the Maojian 3 is 8 to 12cm. The thatch point 3 and the settlement plate 1 which are arranged in this way further stabilize and fix the position and the shape of the monitoring device in the soil body, so as to ensure the point position stability.
Further preferably, the settling plate 1 is coated with a rust-proof coating. So, be convenient for monitoring devices and preserve in the soil body for a long time, be fit for long-term monitoring demand.
Preferably, as shown in fig. 1 and 2, a male bolt perpendicular to the settling plate 1 is provided as a settling rod mounting site 2 at a central position of the second surface of the settling plate 1; correspondingly, the first end of the settlement rod is provided with a female bolt sleeve buckle, and the female bolt sleeve buckle is in threaded connection with the settlement rod mounting position 2 (namely, a male bolt). Further, in the present embodiment, the male bolts vertically disposed on the second surface of the settlement plate 1 are cylindrical, and have a diameter of 1.5 to 2cm and a length of 3 to 5cm.
Of course it is only preferred to set up the public bolt of perpendicular to sedimentation plate 1 as sedimentation rod installation position 2 in the central point on the second surface of sedimentation plate 1, can think of, set up the female bolt housing of perpendicular to sedimentation plate 1 in the central point on the second surface of sedimentation plate 1 and detain as sedimentation rod installation position 2, correspondingly, the first end of sedimentation rod sets up to the public bolt, and public bolt also can realize similar effect with sedimentation rod installation position 2 (female bolt housing is detained promptly) threaded connection.
Preferably, as shown in fig. 3 and 4, in the present embodiment, each settlement joint rod 5 is composed of a female bolt-fastening portion 51, a connecting portion 53 and a male bolt portion 52 which are connected in sequence, the female bolt-fastening portion 51 serves as a first end of the settlement joint rod 5, and the male bolt portion 52 serves as a second end of the settlement joint rod 5.
Further preferably, the connection portion 53 has a regular prism shape. So, conveniently subside festival pole 5 and revolve to twist and connect, conveniently monitor the position and connect the guidance upwards, the position is firm. More preferably, the shape of the connecting portion 53 is the same as the shape of the female bolt turnbuckle portion 51, and both are regular pentagonal prism-shaped.
Further, in the present embodiment, the diameters of the circumscribed circles of the connecting portion 53 and the female bolt buckling portion 51 are both 2.5 to 3.5cm, and the total length is not less than 50cm; the internal diameter of the female bolt buckling part 51 is 1.5-2 cm, and the length is 3-5 cm; the male bolt portion 52 has a diameter of 1.5 to 2cm and a length of 3 to 5cm.
Further preferably, the settlement joint rod 5 is made of hard PVC materials, is convenient to process, stable in structure, economical and applicable, and facilitates the upward connection and leading of point positions.
Preferably, as shown in fig. 1 and 2, round leveling air bubbles 4 are embedded in the openings on the second surface of the settlement plate 1. The adjustment of the levelness of the settlement plate 1 on the soil foundation to be monitored is facilitated, the installation level of the settlement plate 1 is guaranteed, and then the settlement rod is guaranteed to be perpendicularly led.
Further preferably, round leveling air bubbles 4 are embedded in the corners of the second surface of the settlement plate 1.
Furthermore, a male bolt perpendicular to the settling plate 1 is arranged at the center of the second surface of the settling plate 1 and serves as a settling rod mounting position 2, the male bolt is cylindrical, the diameter of the male bolt is 1.5-2 cm, and the length of the male bolt is 3-5 cm.
It should be noted that the invention can be widely applied to the monitoring work of the vertical displacement of the foundation of the deep-buried soil body of civil engineering such as railways, highways, dams, house buildings and the like.
Based on the above proposed vertical displacement monitoring device of the deep-buried soil foundation, the invention also provides a vertical displacement monitoring method of the deep-buried soil foundation, as shown in fig. 5, comprising the following steps:
s1, arranging a settlement plate on a foundation of a soil body to be monitored, inserting a thatch point into the soil body, adjusting the levelness of the settlement plate according to the circular level bubbles, compacting tightly, and recording the number of grids of the circular level bubbles deviating from the central point of the circular level bubbles.
Preferably, the number of cells of the circular level bubble deviated from the center point thereof is 0.5 to 3.0 cells. Specifically, the number of squares the circular level bubble deviates from its center point is recorded by visual inspection or by scale.
S2, screwing and connecting a settlement joint rod to a settlement rod installation position, burying a soil body, continuously connecting the settlement joint rod in real time along with the burying thickness of the soil body, and always keeping the end head of the second end of the settlement rod exposed out of the surface of the soil body; when the landfill is finished, the number of the sedimentation rods connected to the sedimentation plate is recorded, and the length of the sedimentation rod is obtained.
And S3, calculating the length correction value of the settling rod in the vertical direction according to the number of the grids of the circular level bubbles deviated from the central points of the circular level bubbles and the length of the settling rod.
Wherein, the delta H is the length correction value of the settling rod in the vertical direction; l is the length of the settlement rod, the standard length of a single settlement joint rod is multiplied by the number of the joint rods to calculate, the standard length of the single settlement joint rod is the total length of a female bolt sleeve buckling part and a connecting part in the settlement joint rod, and the standard length is a variable; n is the number of grids of the circular level bubble deviating from the center point, and each grid is counted as one grid by 2mm of deviation and is taken as a variable; a is an inclination angle corresponding to each moving grid of the circular level bubble, and the unit is a fixed value of second; ρ is the conversion constant between radians and seconds, and has a value of 206265".
S4, measuring the end head of the second end of the settlement rod to obtain data related to vertical displacement; and calculating the vertical displacement of the foundation of the deep-buried soil body according to the vertical displacement related data and the length correction value of the settlement rod in the vertical direction.
Preferably, the elevation data of the second end head of the settlement rod is measured by an optical level, an electronic level or a total station as the vertical displacement related data.
Preferably, the calculating the vertical displacement of the deep-buried soil foundation according to the vertical displacement related data and the length correction value of the settling rod in the vertical direction includes:
H＝H1-L+ΔH
d＝Hn-Hm
h is elevation data of a deep-buried soil foundation settlement plate; h1 is elevation data of the second end head of the settlement rod; hm and Hn are elevation data of the deep-buried soil foundation settlement plate obtained by measurement in different time periods; d is the settlement of the foundation of the deep-buried soil body.
The vertical displacement monitoring device provided by the invention can stably fix the position and the form of the monitoring device in the soil body, ensure the point position to be stable, and ensure that the part of the settlement rod embedded in the soil body is not easy to deform, so the vertical displacement of the foundation of the deeply embedded soil body is calculated based on the monitoring data of the vertical displacement monitoring device, and the calculation of the vertical displacement is simpler and more convenient to ensure the authenticity and the accuracy of the calculated vertical displacement without considering the position change and the form change of the settlement plate in the soil body and without considering the form change of the settlement rod in the soil body.
The invention calculates the vertical displacement of the deep-buried soil foundation based on the monitoring data of the vertical displacement monitoring device, and considers that the settlement plate can not be strictly positioned at the horizontal position, so that the settlement rod has a certain inclination, the total length of the connection settlement rod is lost in the vertical direction, and the authenticity of a settlement observation value is possibly influenced. The length of the settling rod is corrected in a mode of measuring the deviation grid number of the full-water quasi bubbles and quickly calculating the length correction value of the settling rod in the vertical direction, so that the measured value of the vertical displacement of the soil body is corrected, and the measured value of the soil body settling is more real and objective.
It should be understood that the above description of the specific embodiments of the present invention is provided for illustration only, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and to implement the present invention, but the present invention is not limited to the specific embodiments described above. It is intended that all such changes and modifications as fall within the scope of the appended claims be embraced therein.
Claims (9)
1. A method for monitoring vertical displacement of a deep-buried soil foundation is characterized in that,
the method is realized on the basis of a settlement plate and a plurality of settlement joint rods, wherein a plurality of downwards pointed thatch tips are uniformly arranged on the first surface of the settlement plate around the center of the settlement plate, a settlement rod mounting position is arranged at the center of the second surface of the settlement plate, round leveling bubbles are embedded in an opening on the second surface of the settlement plate, the plurality of settlement joint rods can be sequentially connected in a head-to-tail threaded manner to form the settlement rod, and the first end of the settlement rod is used for being in threaded connection with the settlement rod mounting position;
the vertical displacement monitoring method of the deep-buried soil foundation comprises the following steps:
s1, arranging a settlement plate on a foundation of a soil body to be monitored, inserting a thatch point into the soil body, adjusting the levelness of the settlement plate according to circular level bubbles, compacting, and recording the number of grids of the circular level bubbles deviating from the central point;
s2, connecting a settlement joint rod to a settlement rod mounting position in a screwing mode, burying a soil body, connecting the settlement joint rod in real time along with the soil body burying thickness, and always keeping the second end head of the settlement rod exposed out of the surface of the soil body; when the landfill is finished, recording the number of the sedimentation rods connected to the sedimentation plate and obtaining the length of the sedimentation rod;
s3, calculating the length correction value of the settling rod in the vertical direction according to the number of the grids of the circular level bubbles deviated from the center point of the circular level bubbles and the length of the settling rod;
wherein, the delta H is the length correction value of the settling rod in the vertical direction; l is the length of the settling rod, and the standard length of a single settling rod is multiplied by the number of rods to calculate; n is the number of grids of the circular level bubble deviating from the center point of the circular level bubble, and each grid is counted as one grid when the circular level bubble deviates by 2 mm; a is the inclination angle corresponding to each moving grid of the circular level bubble; ρ is the conversion constant between radian and second value, which is 206265";
s4, measuring the end head of the second end of the settlement rod to obtain data related to vertical displacement; and calculating the vertical displacement of the deep-buried soil foundation according to the vertical displacement related data and the length correction value of the settlement rod in the vertical direction.
2. The method for monitoring the vertical displacement of the deep-buried soil foundation according to claim 1, wherein, in S1,
the number of the grids of the circular level bubble deviating from the center point is recorded by means of visual measurement or ruler measurement.
3. The method for monitoring the vertical displacement of the deep soil foundation according to claim 1, wherein in S1,
the number of the grids of the circular level bubble deviating from the central point is 0.5-3.0 grids.
4. The method for monitoring the vertical displacement of the deep-buried soil foundation according to claim 1, wherein in the step S4, the measuring of the end head of the second end of the settlement rod to obtain the data related to the vertical displacement comprises:
and measuring the elevation data of the second end head of the settlement rod by an optical level, an electronic level or a total station.
5. The method for monitoring the vertical displacement of the deep-buried soil foundation according to claim 4, wherein in S4, the step of calculating the vertical displacement of the deep-buried soil foundation according to the data related to the vertical displacement and the length correction value of the settling rod in the vertical direction comprises the following steps:
H＝H1-L+ΔH
d＝Hn-Hm
h is elevation data of a deep-buried soil foundation settlement plate; h1 is elevation data of the second end head of the settlement rod; hm and Hn are height data of the deep-buried soil foundation settlement plate obtained by measurement in different time periods; d is the settlement of the foundation of the deep-buried soil body.
6. The method of claim 1, wherein the vertical displacement of the deep-buried soil foundation is monitored,
the couch top is in a conical shape or a frustum shape;
the settlement plate is square, and the couchgrass points are arranged at four corners of the settlement plate.
7. The method of claim 1, wherein the monitoring of the vertical displacement of the deep soil foundation is performed by a computer,
a male bolt vertical to the sedimentation plate is arranged at the center of the second surface of the sedimentation plate and serves as a sedimentation rod mounting position; correspondingly, the first end of the sedimentation rod is provided with a female bolt sleeve buckle, and the female bolt sleeve buckle is in threaded connection with the sedimentation rod installation position; alternatively, the first and second electrodes may be,
a female bolt sleeve buckle vertical to the settling plate is arranged at the center of the second surface of the settling plate and serves as a settling rod mounting position; correspondingly, the first end of the settlement rod is provided with a male bolt, and the male bolt is in threaded connection with the settlement rod mounting position.
8. The method of claim 1, wherein the vertical displacement of the deep-buried soil foundation is monitored,
each subsides festival pole and comprises female bolt eye-splice portion, connecting portion and public bolt portion that connect gradually, and female bolt eye-splice portion is as the first end that subsides the festival pole, and public bolt portion is as the second end that subsides the festival pole.
9. The method of claim 1, wherein a circular leveling bubble is embedded in the opening at the corner of the second surface of the settlement plate.
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