A municipal river-crossing pipeline open caisson monitoring sinking stabilizing device and a construction method thereof

Abstract

The application discloses a municipal river-crossing pipeline open caisson monitoring sinking stabilizing device and a construction method thereof, and relates to the technical field of municipal engineering construction technology; the device comprises an open caisson, a cross-shaped clamping groove is formed in one side of the open caisson, a cross-shaped prefabricated block is installed in the cross-shaped clamping groove, a GPS positioning device is installed in the cross-shaped prefabricated block, and the cross-shaped prefabricated block is matched with the cross-shaped clamping groove; and a guide clamping block is installed on the side of the cross-shaped prefabricated block which is opposite to the cross-shaped clamping groove. The application overcomes the defects that the monitoring displacement cannot be monitored in real time and the sinking deviation adjustment is limited during the sinking process of the open caisson.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of municipal engineering construction, and particularly relates to a municipal river-crossing pipeline caisson monitoring sinking stabilizing device and a construction method thereof. BACKGROUND

[0002] In recent years, municipal engineering has developed rapidly. With the unified planning and upgrading of urban underground pipe networks, the reconstruction of old pipelines makes the service facilities of cities more in line with the living requirements, reduces the natural influencing factors, and the development of construction technology makes the people-oriented society safer and travel more convenient and fast.

[0003] In municipal road construction, the underground pipe network is complex, and the limitation of design factors leads to the limitation of construction management in the construction process. At the same time, in different geological regions in China, the difficulty of pipeline construction and the construction of related in-out wells have adverse factors. In the construction process of the caisson, it is difficult to sink in the presence of pebbles, and one side is prone to deflection. The sinking position is affected. At the same time, if the auxiliary measures are not in place, the process control is also difficult, which can easily cause hidden dangers to the construction safety. It is also difficult to handle the deviation of displacement adjustment. In order to avoid these factors and technical limitations, mechanical auxiliary caisson sinking is currently used. Sand filling and adjustment frame bodies are set around the caisson. Through steel materials and four-side lifting, the caisson is assisted to be in place. However, in the actual operation process, the installation of the frame body and the operation of the mechanical equipment have certain adverse factors, which is one of the problems that technical personnel have been trying to solve.

[0004] Therefore, a municipal river-crossing pipeline caisson monitoring sinking stabilizing device and a construction method thereof as mentioned in the application are needed. SUMMARY

[0005] The application aims to provide a water pipeline and well chamber hole connection quick-release mold and construction method to solve the problems of monitoring displacement in real time and the limitation of sinking deviation adjustment in the sinking process of the upper caisson.

[0006] To achieve the above-mentioned purpose, the application provides the following technical scheme:

[0007] A municipal river-crossing pipeline caisson sinking monitoring and stabilizing device, comprising a caisson, a cross-shaped clamping groove is formed on one side of the caisson, a cross-shaped prefabricated block is installed in the cross-shaped clamping groove, a GPS positioning device is installed in the cross-shaped prefabricated block, and the cross-shaped prefabricated block is matched with the cross-shaped clamping groove.

[0008] A guide clamping block is installed on the side of the cross-shaped prefabricated block opposite to the cross-shaped clamping groove.

[0009] In a further technical solution, the horizontal section of the guide block is in the shape of a "T", the caisson is arranged in multiple layers, and cross-shaped clamping slots are arranged in vertical alignment.

[0010] A construction method of a municipal river-crossing pipeline caisson sinking monitoring and stabilizing device includes the following steps:

[0011] Step 1, base lofting:

[0012] Positioning and setting out: according to the drawing, the center line and contour line of the caisson are accurately set out on the construction site to provide a reference for subsequent construction;

[0013] Well point dewatering: before excavation of the foundation pit, a certain number of filter pipes are buried around the foundation pit, and water is pumped out using pumping equipment to keep the excavated soil dry at all times;

[0014] Excavation of blade foot soil: excavate the soil at the blade foot of the caisson to prepare for the installation of blade foot iron and concrete pouring;

[0015] Replace the sand cushion layer: replace the excavated soil with a sand cushion layer to improve the bearing capacity of the foundation;

[0016] Cushion construction: further level and compact the sand cushion layer;

[0017] Making the blade foot: according to the design requirements, install the blade foot iron at the excavated blade foot position, and perform necessary fixing and reinforcement;

[0018] Binding reinforcement and adding water stop steel plate: bind the reinforcement cage inside the caisson formwork, and add water stop steel plates at the required positions to prevent underground water leakage;

[0019] Step 2, set the horizontal reinforcement on the horizontal reinforcement net inserted into the inner wall of the caisson at the center position around the caisson formwork, and the horizontal reinforcement is made of 12mm diameter steel bars;

[0020] Step 3, erect the formwork: install the large formwork;

[0021] Step 4, install the cross-shaped high-strength hard plastic sub-formwork in the large formwork in step 3; at the same time, ensure the thickness of the protective layer and the fixation between the cross-shaped high-strength hard plastic sub-formwork and the large formwork to avoid slurry leakage;

[0022] Step 5, fix all the formwork and pour concrete;

[0023] Step 6, bind the well wall reinforcement: continue to bind the well wall reinforcement on the poured concrete to prepare for subsequent concrete pouring;

[0024] Fix the reserved port: reserve necessary holes or interfaces on the well wall and fix them;

[0025] Joint sealing steel plate welding: welding a sealing steel plate at the joint of the shaft wall to prevent underground water from seeping from the joint;

[0026] Secondary pouring: continue to install the formwork and pour concrete to complete the entire construction of the shaft wall;

[0027] Inner frame removal: after the concrete of the shaft wall reaches the design strength, remove the support frame in the formwork;

[0028] Sinking well sinking: through earth excavation or other auxiliary measures, the sinking well is gradually sunk to the design elevation and stably positioned by relying on its own weight;

[0029] Step 7, after the strength of the secondary poured concrete reaches the requirement, install a cross-shaped prefabricated block at the center position on the sinking well, the cross-shaped prefabricated block is provided with a hole eye, and the diameter of the hole eye is consistent with the diameter of the base clamping head of the GPS positioning device;

[0030] Step 8, install a lifting ring outside the cross-shaped clamping groove and arrange the lifting ring at four corners of the cross-shaped prefabricated block to form a ring;

[0031] Step 9, prepare for sinking, and adopt a corresponding sinking mode according to the requirements of the drawing;

[0032] Step 10, while sinking, the measurement personnel monitor the positioning data at any time according to the positioning data at the sinking well, monitor the displacement deviation through the data, and timely adjust the displacement amount;

[0033] Step 11, when the displacement deviation exceeds the limit, timely suspend the sinking, adopt a lower cushioning mode, or in the case that a large amount of inclination is likely to occur, connect the lifting hook outside the cross-shaped clamping groove with the lifting ring, and then cooperate with a small crane to assist in adjusting the displacement of the sinking well, so as to avoid the damage of the sinking well caused by a large amount of sinking and the threat to the safety of personnel;

[0034] Step 12, when the geological condition is good, the underground water level is low, and there is no large stone in the sinking well, the sinking well is not easy to have a large amount of inclination and sinking, the cross-shaped prefabricated block is connected with the longitudinal guide steel plate, the longitudinal guide steel plate is pre-punched into the outer side surface around the positioning position of the sinking well, and the positioning is prepared through the prepared lofting.

[0035] During the sinking of the sinking well, the number of cross-shaped prefabricated blocks is installed as needed, and the cross-shaped prefabricated blocks are connected with the longitudinal guide steel plate to guide the sinking and assist the sinking well to be positioned.

[0036] In a further technical scheme, after the well point dewatering in step 1, the positioning lofting position needs to be excavated to form a foundation pit, and four groups of control piles are punched into the foundation pit by using a cross intersection method to ensure the subsequent sinking well lowering limiting.

[0037] In a further technical scheme, the longitudinal guide steel plate is in a "C" shape.

[0038] In a further technical solution, the sand cushion layer has a thickness of at least 50 cm, and a C20 commercial concrete layer with a thickness of at least 15 cm is further arranged on the top of the sand cushion layer.

[0039] In a further technical solution, the cross-shaped slot is adapted for the transverse steel bar to pass through; the cross-shaped prefabricated block comprises a frame plate, the frame plate is in a cross shape, and a reserved cavity is arranged in the middle part of the frame plate; a GPS positioning device is arranged in the reserved cavity, and a hole is connected to the top of the frame plate through a mounting bolt.

[0040] The transverse steel bar passes through the frame plate and is locked by a fixing nut.

[0041] Beneficial effects

[0042] In the present application, the longitudinal steel material with a groove is driven into the four sides of the square open caisson, and the well wall with a cross-shaped slot is arranged in the design process of the open caisson. The longitudinal cross-shaped slot of the well wall is arranged to achieve the purpose of installing and assembling the components. The components are prefabricated, and the main components are cross-shaped cards and longitudinal clamping columns. A center GPS positioning device mounting hole is arranged at the upper center position of the cross-shaped card, and a lifting ring mounting hole is arranged at the upper four corner positions. When the open caisson is constructed according to the process, the excavation, cushion layer, cutting foot construction, well body construction, and maintenance are completed, and the sinking is waited for. The cross-shaped prefabricated block is installed, the positioning device and the lifting ring are installed, the real-time observation of the total station or the GPS positioning system is realized, the computer real-time monitoring function is realized, the monitoring data is reminded, the technical personnel guide the on-site construction personnel to adjust the sinking direction and speed, when encountering unknown geological conditions, the temporary lifting function of the lifting ring is used to ensure the stability of the open caisson, and the measurement personnel continue to monitor, so that the whole process sinking monitoring is realized, and additional management personnel are not needed. In the stable geological area, the longitudinal cross-shaped clamping columns and slots can be installed one by one along the longitudinal direction to achieve consistency from top to bottom. The longitudinal groove longitudinal steel plate material is driven into the position of the next layer of the open caisson, and then the open caisson is sunk. The open caisson is guided along the longitudinal direction, and the sinking of the open caisson is more prepared. The horizontal deviation monitoring of the GPS is further used, and the lower support and lifting adjustment of the open caisson are adjusted to achieve stable sinking, so that the open caisson is prepared in place.

[0043] By using the method, the positioning and sinking control precision of the open caisson in the sinking process are effectively improved, the open caisson construction is more convenient and standardized, the modular installation and guiding device are used to assist the completion of the open caisson in place, and the whole construction process of the open caisson is more smooth. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the art, other drawings can also be obtained based on these drawings without any creative effort.

[0045] Figure 1 The installation schematic diagram of the caisson of the present application;

[0046] Figure 2 The structural schematic diagram of the cross-shaped prefabricated block of the present application;

[0047] Figure 3 The schematic diagram of the longitudinal guide steel plate of the present application;

[0048] Figure 4 The fitting schematic diagram of the cross-shaped prefabricated block, the guide block and the longitudinal guide slot of the present application;

[0049] Figure 5 The construction schematic flow chart of the present application;

[0050] Figure 6 The elevation view of the prefabricated block and the clamping column of the cross-shaped prefabricated block of the embodiment 2 of the present application;

[0051] Figure 7 The sectional view schematic diagram of the bottom of the caisson of the present application.

[0052] In the figure: 1, cross-shaped prefabricated block; 2, guide block; 3, longitudinal guide steel plate; 4, caisson; 5, cross-shaped clamping slot; 7, blade foot iron piece; 8, sand cushion layer; 9, lifting ring; 10, control pile; 11, GPS positioning device; 12, frame plate; 13, transverse steel bar; 14, C20 commercial concrete. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the present application in combination with embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0054] The application principle of the present application will be further described in combination with the drawings and specific embodiments.

[0055] Embodiment 1

[0056] Please refer to Figures 1-5As shown, the device provides a municipal river-crossing pipeline caisson sinking monitoring and stabilizing device, which comprises a caisson 4, a cross-shaped clamping groove 5 is formed on one side of the caisson 4, a cross-shaped prefabricated block 1 is installed in the cross-shaped clamping groove 5, a GPS positioning device 11 is installed in the cross-shaped prefabricated block 1, and the cross-shaped prefabricated block 1 is matched with the cross-shaped clamping groove 5; a guide clamping block 2 is installed on the side of the cross-shaped prefabricated block 1 opposite to the cross-shaped clamping groove 5. Figure 2 As shown, the horizontal section of the guide clamping block 2 is in the shape of "T", the caisson 4 is arranged in multiple layers, and the cross-shaped clamping grooves 5 are arranged in vertical arrangement and connection, and multiple groups of the cross-shaped clamping grooves 5 are connected in communication.

[0057] A construction method of a municipal river-crossing pipeline caisson sinking monitoring and stabilizing device, comprising the following steps:

[0058] Step 1, base setting out:

[0059] Positioning and setting out: according to the drawing, the center line and contour line of the caisson 4 are accurately set out on the construction site to provide a reference for subsequent construction;

[0060] Well point dewatering: before excavation of the foundation pit, a certain number of filter pipes are buried around the foundation pit, and water is pumped out by using a water pumping device to keep the excavated soil dry at all times;

[0061] Excavation of blade foot soil: the soil in the blade foot part of the caisson is excavated to prepare for installation of blade foot iron 7 and pouring of concrete;

[0062] Replacement of sand cushion 8: the excavated soil is replaced with sand cushion 8 to improve the bearing capacity of the foundation;

[0063] Cushion construction: further leveling and tamping are carried out on the sand cushion 8;

[0064] Manufacture of blade foot: according to the design requirements, blade foot iron 7 is installed at the excavated blade foot position, and necessary fixing and reinforcement are carried out;

[0065] Binding of steel bars and addition of water stop steel plates: steel reinforcement cages are bound in the caisson formwork, and water stop steel plates are added at the required positions to prevent underground water leakage;

[0066] Step 2, horizontal steel bars 13 are arranged at the center positions of the four sides of the caisson formwork and inserted into the horizontal steel bars on the inner wall of the caisson 4, and the horizontal steel bars 13 are made of steel bars with a diameter of 12 mm;

[0067] Step 3, erecting formwork: large formwork is installed;

[0068] Step 4, cross-shaped high-strength hard plastic sub-formwork is installed in the large formwork in step 3; at the same time, the thickness of the protective layer and the fixation between the cross-shaped high-strength hard plastic sub-formwork and the large formwork need to be fully ensured to avoid slurry leakage;

[0069] Step 5, fix all the templates, and pour the concrete;

[0070] Step 6, tie the well wall reinforcement: continue to tie the well wall reinforcement on the poured concrete, to prepare for subsequent concrete pouring;

[0071] Fix the reserved port: reserve the necessary holes or interfaces on the well wall and fix them;

[0072] Joint water stop steel plate welding: weld the water stop steel plate at the joint of the well wall to prevent groundwater from seeping from the joint;

[0073] Secondary pouring: continue to install the formwork and pour the concrete, and complete the entire production of the well wall;

[0074] Remove the inner frame: after the well wall concrete reaches the design strength, remove the support frame inside the formwork;

[0075] Sink well 4 sinking in place: through earth excavation or other auxiliary measures, make the sink well 4 gradually sink to the design elevation and stabilize in place by relying on its own weight;

[0076] Step 7, after the strength of the secondary poured concrete meets the requirements, install the cross-shaped prefabricated block 1 at the center position on the sink well 4, the cross-shaped prefabricated block 1 has a hole eye with a diameter consistent with that of the GPS positioning device 11 base clamp;

[0077] Step 8, install the lifting rings 9 outside the cross-shaped clamping groove 5, distributed on the four corners of the cross-shaped prefabricated block 1, and form a ring with each other;

[0078] Step 9, prepare for sinking, according to the requirements of the drawings, use the corresponding sinking method;

[0079] Step 10, while sinking, the surveyor measures the positioning data of the sink well 4 at all times, monitors the positioning data in real time, and adjusts the displacement amount in a timely manner through data monitoring displacement deviation;

[0080] Step 11, when the displacement deviation exceeds the limit, suspend the sinking in a timely manner, use the lower cushion method, or in the case of a large amount of inclination, connect the lifting hook with the lifting ring 9 outside the cross-shaped clamping groove 5, and then cooperate with the small crane to assist in adjusting the displacement of the sink well 4, to avoid damage to the sink well 4 and threats to personnel safety caused by a large amount of sinking;

[0081] Step 12, when the geological conditions are good, the groundwater level is low, and there are no large stones in the sink well 4, the sink well 4 is not prone to a large amount of inclination and sinking, the cross-shaped prefabricated block 1 is connected with the longitudinal guide steel plate 3, the longitudinal guide steel plate 3 is pre-drilled into the outer side of the sink well 4 positioning place, and the positioning is prepared by lofting;

[0082] When the caisson 4 is sinking, the number of cross-shaped precast blocks 1 is installed as needed and connected with the longitudinal guide steel plate 3, and the guide is sunk to assist the caisson 4 to be in place.

[0083] After the well point dewatering in step 1, the positioning and layout site needs to be excavated to form a foundation pit, and four groups of control piles 10 are driven into the foundation pit by using the cross intersection method to ensure the subsequent sinking of the caisson 4 to be limited. The longitudinal guide steel plate 3 is in the shape of "C".

[0084] Example 2

[0085] As shown in Figures 6-7 , it is another embodiment of the present application, which is based on example 1, and in a further technical solution, the sand cushion layer 8 has a thickness of at least 50 cm, and a C20 commercial concrete layer with a thickness of at least 15 cm is further laid on the top. As shown in Figure 6 , the cross-shaped clamping groove 5 is suitable for the transverse steel bar 13 to pass through; the cross-shaped precast block 1 includes a frame plate 12, which is in the shape of a cross and has a reserved cavity in the middle, the GPS positioning device 11 is installed in the reserved cavity, and the top is connected with the hole through the mounting bolt; the transverse steel bar 13 passes through the frame plate 12 and is locked by the fixing nut.

[0086] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

[0087] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A construction method of a municipal river-crossing pipe caisson sinking monitoring sinking stabilizing device, characterized by, The utility model relates to a municipal pipeline across river caisson monitoring sinking stabilizing device, and relates to municipal engineering technology field. The municipal pipeline across river caisson monitoring sinking stabilizing device comprises a caisson (4), a cross-shaped clamping groove (5) is formed on one side of the caisson (4), a cross-shaped prefabricated block (1) is installed in the cross-shaped clamping groove (5), a GPS positioning device (11) is installed in the cross-shaped prefabricated block (1), and the cross-shaped prefabricated block (1) is matched with the cross-shaped clamping groove (5). A guide clamping block (2) is installed on the side of the cross-shaped prefabricated block (1) away from the cross-shaped clamping groove (5). The horizontal section of the guide clamping block (2) is in the shape of a "T", the caisson (4) is arranged in multiple layers and is connected with the cross-shaped clamping grooves (5) in the vertical direction, and the cross-shaped clamping grooves (5) are connected in groups. The utility model further comprises the following steps: Step 1, base lofting: Positioning and line laying: according to the drawing, the center line and the contour line of the caisson (4) are accurately laid out on the construction site to provide a reference for subsequent construction; Well point dewatering: before excavation of the foundation pit, a certain number of filter pipes are buried around the foundation pit, and water is pumped out by using a water pumping device to keep the excavated soil dry at all times; Ditch foot earthwork: the earthwork of the caisson blade foot part is excavated to prepare for installation of the blade foot iron piece (7) and pouring of concrete; Sand cushion (8) replacement: the excavated earthwork is replaced by a sand cushion (8) to improve the bearing capacity of the foundation; Cushion construction: the sand cushion (8) is further leveled and tamped; Blade foot making: according to the design requirements, the blade foot iron piece (7) is installed at the excavated blade foot position, and necessary fixing and reinforcing are carried out; Steel bar binding and water stop steel plate adding: the steel bar framework is bound in the caisson formwork, and a water stop steel plate is added at the required position to prevent underground water leakage; Step 2, a horizontal steel bar (13) is arranged at the central position of the four sides of the caisson formwork and inserted into the steel bar net on the inner wall of the caisson (4), and the horizontal steel bar (13) is made of a steel bar with a diameter of 12 mm; Step 3, form erection: the large formwork is installed; Step 4, the cross-shaped high-strength hard plastic sub-formwork is installed in the large formwork in step 3; at the same time, the thickness of the protective layer and the fixation between the cross-shaped high-strength hard plastic sub-formwork and the large formwork are fully ensured to avoid slurry leakage; Step 5, all the formworks are fixed, and the concrete is poured; Step 6, well wall steel bar binding: the well wall steel bar is continuously bound on the poured concrete to prepare for subsequent concrete pouring; Fixed reserved port: necessary holes or interfaces are reserved on the well wall and fixed; Joint water stop steel plate welding: the water stop steel plate is welded at the joint of the well wall to prevent underground water leakage from the joint; Secondary pouring: the formwork is continuously installed and the concrete is poured to complete the whole making of the well wall; Inner frame removal: after the well wall concrete reaches the design strength, the support frame in the formwork is removed; Caisson (4) sinking and positioning: through earth excavation or other auxiliary measures, the caisson (4) is gradually sunk to the design elevation and stably positioned by relying on its own weight; Step 7, after the strength of the secondary poured concrete reaches the requirement, the cross-shaped prefabricated block (1) is installed at the central position of the caisson (4), the cross-shaped prefabricated block (1) is provided with a hole eye, and the diameter of the hole eye is consistent with that of the base clamping head of the GPS positioning device (11). Step 8, install the lifting ring (9) outside the cross slot (5), and distribute them on the four corners of the cross prefabricated block (1), and form a ring by two of them; Step 9, prepare for sinking, according to the requirements of the drawings, adopt the corresponding sinking mode; Step 10, while sinking, the measurement personnel monitor the positioning data at the caisson (4) at all times, monitor the displacement deviation through data monitoring, and adjust the displacement amount in time; Step 11, when the displacement deviation is out of limit, suspend sinking in time, adopt the lower cushion method, or in the case of easy generation of a large amount of inclination, connect the lifting hook with the lifting ring (9) outside the cross slot (5), and then cooperate with the small crane to assist in adjusting the displacement of the caisson (4), so as to avoid the damage of the caisson (4) caused by a large amount of sinking and the threat to the safety of personnel; Step 12, when the geological conditions are good, the groundwater level is low, and there is no large stone in the caisson (4), the caisson (4) is not easy to appear a large amount of inclination and sinking, adopt the connection of the cross prefabricated block (1) and the longitudinal guide steel plate (3), the longitudinal guide steel plate (3) is pre-punched into the outer side of the caisson (4) positioning place, and the positioning is prepared by lofting; the longitudinal guide steel plate (3) is provided with a guide groove relative to the caisson (4); When the caisson (4) is sinking, the number of cross prefabricated blocks (1) is installed as needed and connected with the longitudinal guide steel plate (3) to guide the sinking and assist the caisson (4) to be in place.

2. The construction method of a municipal river-crossing pipe open caisson monitoring sinking stabilizing device according to claim 1, characterized in that, After the well point dewatering in step 1, the positioning lofting place needs to be excavated to form a foundation pit, and four groups of control piles (10) are punched into the foundation pit by using the cross method to ensure the subsequent sinking of the caisson (4).

3. The construction method of a municipal river-crossing pipe open caisson monitoring sinking stabilizing device according to claim 2, characterized in that, The longitudinal guide steel plate (3) is in the shape of "C".

4. The construction method of a municipal river-crossing pipe open caisson monitoring sinking stabilizing device according to claim 3, characterized in that, The thickness of the sand cushion layer (8) is at least 50 cm, and the top is paved with C20 commercial concrete (14) with a thickness of at least 15 cm.

5. The construction method of a municipal river-crossing pipe open caisson monitoring sinking stabilizing device according to claim 4, characterized in that, The cross slot (5) is suitable for the transverse steel bar (13) to pass through; the cross prefabricated block (1) includes a frame plate (12), the frame plate (12) is in the shape of a cross, and a reserved cavity is arranged in the middle, a GPS positioning device (11) is installed in the reserved cavity, and the top is connected with the hole through a mounting bolt; The transverse steel bar (13) passes through the frame plate (12) and is locked by a fixed nut.

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