Fine-tuning Method for Prefabricated Steel Spring Plates

Abstract

The present invention discloses a fine adjustment method for a precast steel spring slab, comprising: A. laying the precast steel spring slab (4) on a square wood cushion or a combined vibration isolator; B. installing fine adjustment claws (3) on both sides of the precast steel spring slab (4) to lift the spring precast slab (4); C. installing a total station (2) and installing a set of fine adjustment measurement devices (1) on the surface of the precast steel spring slab (4); D. using the total station (2) to measure the offset of each fine adjustment measurement device (1), obtaining the adjustment amount of each fine adjustment claw (3), and adjusting the fine adjustment claw (3) according to the adjustment amount to adjust the precast steel spring slab (4) to the designed position. The present invention solves construction problems such as uneven force on the vibration isolator of the subway precast steel spring slab (4), low construction efficiency, high safety risk, difficult finished product protection, difficult equipment replacement and maintenance, and cumbersome jacking process.

Description

Technical Field

[0001] The invention belongs to the technical field of subway track construction, and in particular relates to a method for fine-tuning a track prefabricated plate. Background Art

[0002] Steel spring precast slab roadbed is widely used in special vibration reduction areas of subways (residential areas, hospitals, theaters, etc.) due to its excellent vibration reduction effect, long fatigue life and convenient later maintenance. However, it also has problems such as complex procedures and high quality control requirements.

[0003] The commonly used steel spring lifting method is rail lifting:

[0004] ①First, use the total station + fine-tuning trolley to collect the rail surface elevation, and then mark the data on the rail;

[0005] ②Then adjust the horizontal position through the hydraulic press, install the positioning pin after it meets the requirements, and put in the vibration isolator;

[0006] ③ Use a special hydraulic jack to lift the steel spring floating plate, and put in an adjustment gasket with the same lifting thickness. To avoid overstress on the floating plate, this step must be carried out in at least two steps;

[0007] ④After the first lifting of the steel spring floating plate, repeat step ①. If the lifting height does not meet the requirements, use a special hydraulic jack to lift the steel spring floating plate, and put in an adjustment gasket with the same lifting thickness;

[0008] ⑤Repeat step ④ until the lifting amount at all positions meets the design requirements.

[0009] In the existing subway lines, it was found that the steel spring prefabricated panels using rail jacking had the following disadvantages:

[0010] ① The vibration isolator is hung empty, which causes uneven force on the vibration isolator, affecting the uniform force and service life of the vibration isolators on both sides;

[0011] ② The hydraulic press adjusted the horizontal position, causing more damage on both sides of the steel spring prefabricated plate;

[0012] ③ The lifting steps are single and fixed. According to previous construction experience, at least three liftings and four measurements are required to meet the requirements, resulting in low construction efficiency;

[0013] ④ The hydraulic press adjusts the horizontal direction, and the hydraulic jack lifts the steel spring floating plate and puts in the adjustment gasket at the same time, which poses a high safety hazard;

[0014] ⑤ The hydraulic jack requires electricity to use and there are potential safety hazards in temporary electricity use. It is heavy and difficult to operate. Once a failure occurs, it is difficult to repair and affect the construction progress.

[0015] To overcome these problems and improve the construction quality of steel spring precast slabs, it is urgent to develop a new jacking method for steel spring precast slabs. Summary of the Invention

[0016] The technical problem to be solved by the present invention is to solve the construction problems such as uneven force on the isolators of the subway steel spring precast slab (4), low construction efficiency, high safety risk, difficult finished product protection, difficult equipment replacement and maintenance, and cumbersome jacking process.

[0017] The technical solution of the present invention is as follows:

[0018] A method for fine-tuning a steel spring precast slab, comprising:

[0019] A. Lay the steel spring precast slab 4 on a wooden square pad or a combined isolator;

[0020] B. Install fine-tuning claws 3 on both sides of the steel spring precast slab 4 to lift the spring precast slab 4;

[0021] C. Install a total station 2 and install a set of fine-tuning measurement devices 1 on the surface of the steel spring precast slab 4;

[0022] D. Use the total station 2 to measure the offset of each fine-tuning measurement device 1 to obtain the adjustment amount of each fine-tuning claw 3,

[0023] Adjust the fine-tuning claw 3 according to the adjustment amount to adjust the steel spring precast slab 4 to the designed position.

[0024] Before fine-tuning, obtain the compression amount of the isolator due to the self-weight of the steel spring precast slab 4. When calculating the adjustment amount of each fine-tuning claw 3, the actual jacking amount = theoretical jacking amount + self-weight compression amount.

[0025] After the fine-tuning in step D is completed, drill a hole in the center of the outer sleeve 6 of the steel spring precast slab 4, install a positioning pin, place an isolator, add all the adjustment gaskets at one time, and remove the fine-tuning claw 3.

[0026] The fine-tuning claw 3 is installed on a worm 3-3. The worm 3-3 is vertically installed on a transverse slider. The transverse slider is installed on a longitudinal slider through a transverse fine-tuning bolt 3-2. The longitudinal slider is installed on a base through a longitudinal fine-tuning bolt 3-3.

[0027] The fine-tuning claw 3 includes a slider, a guard plate and two horizontal bolts. When in use, the two horizontal bolts are inserted into the precast holes 5 on the side of the steel spring precast slab 4. The guard plate is attached to the side of the steel spring precast slab 4. The two horizontal bolts are fixedly connected to the guard plate through nuts. The guard plate is connected to the slider, and the slider is installed on the vertically erected worm 3-3.

[0028] Use a torque wrench to rotate the worm 3-3 to adjust the height of the fine-tuning claw 3, rotate the horizontal fine-tuning bolt 3-2 to adjust the horizontal position of the fine-tuning claw 3, and rotate the vertical fine-tuning bolt 3-3 to adjust the vertical position of the fine-tuning claw 3.

[0029] The structure of the fine-tuning measuring device 1 includes: a reflecting prism is hinged on a fork-shaped bracket, the lower end of the fork-shaped bracket is rotatably installed on a column, and the column is installed on a base.

[0030] The fine-tuning measuring device 1 is placed on the track support table 7 corresponding to the position of the fine-tuning claw 3.

[0031] Four fine-tuning measuring devices 1 are grouped together, one of which is the main tooling, and the other three are auxiliary toolings. A laser centering device, an inclination sensor, an antenna, a controller and a power supply are installed on the main tooling, and a calculation terminal is configured. The calculation terminal obtains the data of the total station and the main tooling, calculates the adjustment amount of the positions of the other 3 auxiliary measuring toolings, and makes horizontal and vertical adjustments to the steel spring precast slab 4 according to the adjustment amount until the values meet the allowable errors of the design and specifications, that is, the fine-tuning work of this slab is completed.

[0032] Configure an adjustment amount display for each fine-tuning measuring device 1.

[0033] The beneficial effects of the present invention are:

[0034] ① When jacking under the trackless state, there is no constraint on the adjacent steel spring precast slabs 4, and the acting force distributed to the vibration isolators after jacking is relatively uniform, which is more in line with the operating state and improves the project quality;

[0035] ② Use the fine-tuning claw 3 to adjust the steel spring precast slab 4 to the design value at one time, and install the vibration isolation elements at one time, which simplifies the jacking process and improves work efficiency.

[0036] ③ Use the lifting hole 5 to install the fine-tuning claw 3 to adjust the direction and elevation of the precast slab, and the finished product of the precast slab will not be damaged;

[0037] ④ There is no hydraulic equipment and no temporary power supply, reducing safety risks;

[0038] ⑤ The combination of "quick torque wrench + fine-tuning claw 3" is lighter and more flexible than a hydraulic jack, and is convenient for replacement and maintenance. Description of the Drawings

[0039] Figure 1 It is a fine-tuning schematic diagram of the present invention.

[0040] Figure 2 It is a schematic diagram of the track slab rapid fine-tuning measuring device of the present invention. The higher one on the left is the main tooling, and the lower one on the right is the auxiliary tooling.

[0041] Figure 3 It is a schematic diagram of the fine-tuning claw of the present invention. Detailed Embodiments

[0042] Example 1:

[0043] The jacking method for the steel spring precast slab 4 includes the following construction steps:

[0044] Obtain compression parameters: Before starting the large-scale jacking of the steel spring precast slab 4, it is necessary to conduct on-site experiments to obtain the compression amount of the vibration isolator due to the self-weight of the steel spring precast slabs 4 from different manufacturers. When using the fine-tuning claws 3 to adjust the precast slab, the compression amount needs to be calculated into the adjustment amount.

[0045] Coarse laying and adjustment of the steel spring precast slab 4: Lay the steel spring precast slab 4 according to the measurement control piles and the slab layout table on the base 8. When laying the steel spring precast slab 4 without a combined vibration isolator, 4 pieces of 5-cm-thick square timbers need to be used as temporary supports at the slab ends. The steel spring precast slab 4 with a combined vibration isolator is directly laid on the combined vibration isolator. The accuracy requirement for the preliminary laying direction is controlled within 1 cm.

[0046] Install the fine-tuning claws 3: Install 4 fine-tuning claws 3 at the positions of the lifting holes 5 on both sides of the steel spring precast slab 4. Use 4 quick torque wrenches to rotate the screws of the 4 fine-tuning claws 3 simultaneously to lift the steel spring precast slab 4 until the temporary square timbers can be removed.

[0047] Fine adjustment of the steel spring precast slab 4: The surveyor uses the "total station 2 + track slab quick fine-tuning measurement equipment 1" to obtain the direction and elevation adjustment data at the positions of the 4 fine-tuning claws 3 of the steel spring precast slab 4. Adjust the fine-tuning claws 3 according to the data using a quick torque wrench to adjust the precast slab to the designed position.

[0048] Install vibration isolation elements: After the fine adjustment is completed, drill a hole in the center of the outer sleeve 6, install the positioning pin, place the vibration isolator, and add all the adjustment shims at one time.

[0049] Demolish the jacking equipment: After the installation of the vibration isolation elements is completed, directly demolish the fine-tuning claws 3.

[0050] Example 2: Jacking of the steel spring precast slab 4 without a combined vibration isolator in a circular tunnel:

[0051] First step: Select multiple precast slabs on-site and jack them without considering their self-weight. After jacking, measure the elevation data and compare it with the designed elevation to obtain the compression amount of the vibration isolator due to the self-weight of the steel spring precast slab 4 without a combined vibration isolator. When using the fine-tuning claws 3 to adjust the precast slab later, calculate the compression amount into the adjustment amount. Actual jacking amount = theoretical jacking amount + self-weight compression amount.

[0052] Second step: Lay the steel spring precast slab 4 without a combined vibration isolator according to the measurement control piles and the slab layout table on the base 8. Use 4 pieces of 5-cm-thick square timbers as temporary supports at the slab ends, and ensure that the direction and elevation of the precast slab are controlled within 1 cm.

[0053] Step 3: Place 4 fine adjustment claws 3 on each precast steel spring slab 4, and install them into the lifting holes on both sides of the precast steel spring slab 4. Use 4 quick torque wrenches to simultaneously rotate the screws of the 4 fine adjustment claws 3 to lift the precast steel spring slab 4 until the temporary wooden square can be removed.

[0054] Step 4: The surveyor sets up the total station 2, places 4 rapid fine adjustment measuring devices 1 for track slabs on the track support table 7 at the positions corresponding to the fine adjustment claws 3, obtains the direction and elevation adjustment data of the precast steel spring slab 4 through the measuring instrument, and adjusts the fine adjustment claws 3 according to the data using a quick torque wrench to adjust the precast slab to the designed position.

[0055] Function and principle of the rapid fine adjustment measuring device 1 for track slabs: By comparing the theoretical position coordinates of the prism with the measured coordinates, the adjustment amount for the corresponding adjustment station is obtained, and then the horizontal and vertical positions of the precast steel spring slab 4 are precisely adjusted to achieve precise coincidence of the precast steel spring slab 4 with the designed position. The fine adjustment software system first controls the total station to measure the main measuring tooling, reads the inclination sensor data in the main measuring tooling, calculates the adjustment amounts for the positions of the other 3 sub-measuring toolings, and the fine adjustment operator adjusts the precast steel spring slab 4 horizontally and vertically according to the adjustment amounts until the values meet the allowable errors of the design and specifications, that is, the fine adjustment of this slab is completed.

[0056] Function and principle of the fine adjustment claw 3: The fine adjustment claw 3 can perform three-dimensional adjustment, namely, the horizontal, vertical, and elevation adjustment of the precast slab. Using a quick torque wrench to rotate the fine adjustment claw bolt 3-1 can adjust the horizontal position of the precast slab; using a quick torque wrench to rotate the fine adjustment claw bolt 3-2 can adjust the vertical position of the precast slab; using a quick torque wrench to rotate the fine adjustment claw bolt 3-3 can adjust the elevation position of the precast slab.

[0057] Step 5: After the fine adjustment is completed, drill a hole in the center of the outer sleeve 6, clean the ash layer and install the positioning pin, and then place the vibration isolator in the outer sleeve and install all the adjustment shims at one time.

[0058] Step 6: After the installation of the vibration isolation elements is completed, directly remove the fine adjustment claw 3 and transport it to the next section of the precast steel spring slab 4 area for continued jacking.

[0059] Embodiment 3: To improve the calculation speed and adjustment speed of the fine adjustment amount, the fine adjustment measuring device 1 is designed as one main tooling and 3 sub-tooling, equipped with a control terminal, a total station, and four adjustment amount displays, and data transmission between each component is realized through a radio station. It is installed with fine adjustment software. The fine adjustment software controls the total station to measure the reflecting prism 1 of the main tooling and reads the inclination data, calculates the adjustment amounts for 4 stations and sends them to the corresponding adjustment amount displays.

[0060] The structure of the three auxiliary toolings includes an auxiliary reflecting prism 7 and an auxiliary base 8. The auxiliary reflecting prism 7 is hinged on a fork-shaped bracket. The lower end of the fork-shaped bracket is rotatably installed on a column, and the column is installed on the auxiliary base 8. The main tooling and the three auxiliary toolings are arranged at four workstations of the track slab to be finely adjusted. A laser centering device, a control circuit board, and an inclination sensor are also installed on the main tooling. The column heights of the three auxiliary toolings are different. Among them, the heights of the No. 1 and No. 2 toolings are relatively low, 160 mm, and the heights of the No. 3 and No. 4 toolings are relatively high, 250 mm.

[0061] After the four toolings are fixed on the precast slab, adjust the laser centering device on the main tooling to align with an auxiliary tooling to measure the inclination angles of the two. The calculation formula for the elevation adjustment amount is H 副 = H 主 + D 主副 * SinA, where H 副 is the elevation of the auxiliary tooling to be adjusted, Hmain is the elevation of the main tooling, D is the distance from the auxiliary tooling to the main tooling, and A is the inclination angle between the main and auxiliary toolings read by the inclination sensor.

[0062] Those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these changes and modifications.

[0063] The content not detailed in this specification belongs to the prior art well known to those skilled in the art.

Claims

1. A fine-tuning method for precast steel spring plates, characterized in that it includes: A. Lay the precast steel spring plate (4) on a wooden square pad or a combined vibration isolator; B. Install fine-tuning claws (3) on both sides of the precast steel spring plate (4) to lift the precast steel spring plate (4); C. Install a total station (2), and install a set of fine-tuning measurement devices (1) on the surface of the precast steel spring plate (4). The structure of the fine-tuning measurement device (1) includes: a reflecting prism is hinged on a fork-shaped bracket, the lower end of the fork-shaped bracket is rotatably installed on a column, the column is installed on a base, and four fine-tuning measurement devices (1) form a group. One of them is the main tooling, and the other three are auxiliary toolings. A laser centering device, an inclination sensor, an antenna, a controller and a power supply are installed on the main tooling. A calculation terminal is configured. The calculation terminal obtains the data of the total station and the main tooling, and calculates the adjustment amount of the positions of the other 3 auxiliary toolings. The column heights of the three auxiliary toolings are different. Two of the auxiliary toolings have lower heights, and the other auxiliary tooling and the main tooling have higher heights; D. Use a total station (2) to measure the offset of each fine-tuning measurement device (1), obtain the adjustment amount of each fine-tuning claw (3), adjust the fine-tuning claw (3) according to the adjustment amount, and adjust the precast steel spring slab (4) to the designed position; after the four toolings are fixed on the precast slab, adjust the laser centering device on the main tooling to align with a sub-tool to measure the inclination angle between the two. The calculation formula for the elevation adjustment amount is H 副 =H 主 +D 主副 *SinA, where H 副 is the elevation of the sub-tool to be adjusted, H 主 is the elevation of the main tool, D 主副 is the distance from the sub-tool to the main tool, and A is the inclination angle between the main and sub-tools read by the inclination sensor; perform horizontal and vertical adjustments on the precast steel spring slab (4) according to the adjustment amount until the values meet the tolerance limits of the design and specifications, that is, complete the fine-tuning work of the precast steel spring slab (4).

2. The fine-tuning method for precast steel spring plates according to claim 1, characterized in that : Before fine-tuning, obtain the compression amount of the vibration isolator due to the self-weight of the precast steel spring plate (4). When calculating the adjustment amount of each fine-tuning claw (3), the actual jacking amount = theoretical jacking amount + self-weight compression amount.

3. The fine-tuning method for precast steel spring plates according to claim 2, characterized in that : After step D of fine-tuning is completed, drill a hole in the center of the outer sleeve (6) of the precast steel spring plate (4), install a positioning pin, put in the vibration isolator, add all the adjustment gaskets at one time, and remove the fine-tuning claws (3).

4. The fine-tuning method for precast steel spring plates according to claim 2, characterized in that : The fine-tuning claw (3) is installed on a worm (3-3), the worm (3-3) is vertically installed on a transverse slider, the transverse slider is installed on a longitudinal slider through a transverse fine-tuning bolt (3-2), and the longitudinal slider is installed on a base through a longitudinal fine-tuning bolt (3-1).

5. The fine-tuning method for precast steel spring plates according to claim 4, characterized in that : The fine-tuning claw (3) includes a slider, a guard plate and two horizontal bolts. When in use, the two horizontal bolts are inserted into the precast holes (5) on the side of the precast steel spring plate (4), the guard plate is attached to the side of the precast steel spring plate (4), the two horizontal bolts are fixedly connected to the guard plate through nuts, the guard plate is connected to the slider, and the slider is installed on the vertical worm (3-3).

6. The fine-tuning method for precast steel spring plates according to claim 5, characterized in that: Use a torque wrench to rotate the worm (3-3) to adjust the height of the fine-tuning claw (3), rotate the transverse fine-tuning bolt (3-2) to adjust the transverse position of the fine-tuning claw (3), and rotate the longitudinal fine-tuning bolt (3-1) to adjust the longitudinal position of the fine-tuning claw (3).

7. The fine-tuning method for precast steel spring plates according to claim 6, characterized in that: The fine-tuning measurement device (1) is placed on the crosstie support (7) at the position corresponding to the fine-tuning claw (3).

8. The fine-tuning method for precast steel spring plates according to claim 7, characterized in that: Configure an adjustment amount display for each fine-tuning measurement device (1).

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