A method and apparatus for testing the deformation of a hanging basket

Abstract

This invention discloses a method and device for testing the deformation of a hanging basket, overcoming the problems of insufficient measurement accuracy and high requirements for the geographical environment under the hanging basket in the existing technology. The testing method uses six identical hanging basket deformation testing devices (A); each includes a nut (1), a washer (2), a lifting eye bolt (3), two identical copper rings (4), a steel wire rope (5), and a lifting eye weight (6). The upper end (C) of the steel wire rope is tightly connected to the lifting eye bolt (3) through the copper ring (4), and the lower end (D) of the steel wire rope is tightly connected to the lifting eye weight (6) through the second copper ring (4). The method for testing the deformation of a hanging basket includes the following steps: 1) assembling the hanging basket; 2) setting up a level instrument; 3) installing the hanging basket deformation monitoring device (A); 4) taking the elevation reading at the S1 scale line before the hanging basket is preloaded; 5) taking the elevation reading at the S2 scale line after the hanging basket is preloaded; 6) taking the elevation reading at the S3 scale line after the hanging basket is unloaded; 7) determining the deformation of the hanging basket.

Description

Technical Field

[0001] This invention relates to a method for monitoring the construction of cantilever concrete bridges, and more specifically, to a method and device for testing the deformation of the formwork during the cantilever construction of concrete bridges. Background Technology

[0002] Cantilever construction refers to a construction method in which working platforms are set up on both sides of the bridge piers, and cement concrete beams are poured segment by segment towards the mid-span in a balanced manner, with prestressing applied segment by segment. The main equipment involved in cantilever construction is a pair of movable formwork. The formwork moves on the beam segments that have been tensioned, anchored, and integrated with the pier body. Reinforcing steel binding, formwork erection, concrete pouring, and prestressing are all carried out on the formwork. After completing the construction of the current segment, the formwork symmetrically moves forward in cantilever construction until the mid-span is closed. To ensure that the bridge has a smooth alignment and uniform internal force distribution after each span is closed, monitoring during the cantilever construction process is particularly important. Construction monitoring involves simulating the entire bridge construction process using finite element software to obtain the cumulative deformation of each segment during cantilever construction. Then, based on the actual deformation of the formwork before and after preloading, obtained from the formwork at the cantilever construction site, the formwork elevation of each segment during cantilever construction can be calculated. The formwork elevation refers to the elevation of the formwork before bridge pouring. Monitoring the formwork elevation of each segment is a key focus during cantilever bridge construction. Preloading of the formwork involves using sandbags, water tanks, etc., to apply an equivalent load to the formwork to establish a linear relationship between its elastic deformation and the load, eliminating inelastic deformation. Testing the formwork deformation before and after preloading is a crucial aspect of monitoring cantilever bridge construction.

[0003] The existing methods for testing the deformation of hanging basket formwork before and after preloading mainly include the following:

[0004] I. Total Station Prism Observation Method

[0005] The required instruments are a high-precision total station, a tripod, a total station prism, and a centering rod. A total station, also known as a total-station electronic distance measuring instrument, is a high-tech surveying instrument integrating optics, mechanics, and electronics. It is a surveying instrument system that integrates the functions of measuring horizontal angles, vertical angles, distances (slope distances, horizontal distances), and elevation differences. The working principle of a total station is that it emits infrared light, which is reflected by the total station prism, received by the total station, and calculated by its internal electronic components to achieve the purpose of measuring distance and angle. When testing the elevation before and after the preloading of the hanging basket formwork, a location with a wide field of vision and solid ground should be selected first. A tripod should be stably erected at the location, and then the total station should be mounted on the tripod and centered and leveled. Install the total station prism on the centering rod, which has a built-in bubble level. Place one centering rod with the total station prism at a control point with known elevation coordinates. The operator holds the centering rod so that its bottom rests against the control point, and maintains the verticality of the centering rod by observing the bubble level. Install the other total station prism on the centering rod, and then place the bottom of the centering rod against the formwork to be tested for deformation. After adjusting the total station to be level and ensuring both centering rods are vertical, observe the total station prisms on the centering rods and record the data. The elevation of the formwork before and after preloading can then be calculated using the principle of trigonometric leveling.

[0006] The problems with this method are as follows: When observing with a total station, the fine adjustment knob of the total station needs to be manually adjusted to align the crosshairs in the eyepiece with the center of the total station prism before taking a reading. This method cannot guarantee that the crosshairs in the total station eyepiece are aligned with the center of the total station prism before and after the basket preloading. Furthermore, the greater the horizontal distance between the total station and the total station prism, the greater the error. Secondly, the larger the vertical angle between the total station and the total station prism, the greater the error in the test results.

[0007] II. Steel tape transfer observation method

[0008] The required instruments are a steel tape measure, a level, a leveling rod with a bubble level, and a tripod. The principle of leveling is as follows: Leveling utilizes the horizontal line of sight provided by the level to directly determine the elevation difference between two points on the ground using a graduated leveling rod. Then, based on the known elevation and the measured elevation difference, the elevation of the unknown point is calculated. When measuring the elevation of a hanging basket formwork, firstly, using a leveling rod and level, the elevation of the known elevation control point is transferred to below the point to be measured on the hanging basket formwork using a closed leveling route method. This point is then marked and recorded, and named a temporary elevation control point. When conducting elevation tests on the hanging basket formwork, the operator places the starting end (0-degree end) of a steel tape measure on the area to be tested on the hanging basket formwork, then throws the tape measure downwards. When the thrown end of the tape measure is close to the ground or above the temporary bridge deck, another operator catches the thrown end and pulls it vertically downwards to keep the middle section of the tape measure taut and vertical. Once the middle section of the tape measure is taut, stable, and vertical, the operator erects a leveling rod with a bubble level at the temporary elevation control point, keeping the leveling rod vertical. The tripod is set up on solid ground where both the scale on the steel tape measure and the scale on the leveling rod at the temporary elevation control point can be observed simultaneously, and then the leveling instrument is leveled. After leveling the instrument, adjust its observation direction and read the corresponding scales on the leveling rod and steel tape measure. Then, using the principle of leveling, the elevation of the point to be measured on the hanging basket template can be obtained.

[0009] The problem with this testing method is that it cannot accurately guarantee that the middle section of the steel measuring tape is vertical. If the middle section of the measuring tape is curved rather than vertical due to operator error or weather conditions, it will introduce significant errors. Furthermore, in windy weather, the steel measuring tape cannot remain stable under the influence of the wind, which will cause considerable interference and errors in the observation.

[0010] III. Dial Indicator Measurement Method

[0011] The required instruments are a dial indicator, wire rope, copper ring, weight, wire rope fixing device, and dial indicator fixing device. The testing procedure is as follows: determine the test position on the hanging basket template; glue the wire rope fixing device to the test position on the template; connect the wire rope to the wire rope fixing device using the copper ring; lower the other end of the wire rope to near the ground and connect it to the weight using the copper ring; place the dial indicator fixing device below the weight and adjust the weight height so that the weight rests on the dial indicator; record the number of revolutions the dial indicator makes before and after preloading.

[0012] The problem with this method is that it cannot be implemented if the geographical environment below the basket is unfavorable, such as when there is water, a temporary construction bridge, or a major road. Specifically: when there is water below the basket, it is impossible to set up a dial indicator fixing device; when there is a temporary construction bridge below the basket, the swaying of the temporary construction bridge before and after the basket is preloaded will significantly interfere with the test results; when there is a major road below the basket, the road cannot be closed for a long time, and even if the road is closed, the heavy traffic will interfere with the accuracy of the test. Summary of the Invention

[0013] The technical problem to be solved by the present invention is to overcome the problems of insufficient measurement accuracy and high requirements for the geographical environment below the hanging basket in the existing technology, and to propose a method and device for testing the deformation of the hanging basket.

[0014] To solve the above-mentioned technical problems, the present invention is implemented using the following technical solution: The method for testing the deformation of a hanging basket includes the following steps:

[0015] 1) Assemble the hanging basket;

[0016] 2) Set up the level instrument;

[0017] 3) Install the hanging basket deformation testing device;

[0018] 4) Elevation reading at the S1 scale line before preloading of the hanging basket;

[0019] 5) Elevation reading at the S2 mark after preloading of the hanging basket;

[0020] 6) Elevation reading at the S3 mark after the hanging basket is unloaded;

[0021] 7) Determine the deformation of the hanging basket.

[0022] The assembled hanging basket mentioned in the technical solution refers to:

[0023] 1) Install the running track:

[0024] There are two sets of running tracks, with two tracks in each set. Running track pad beams are laid on the top plate of the 0# block box girder. The running track pad beams are evenly spaced along the longitudinal direction of the bridge. The running track pad beams are perpendicular to the web of the 0# block box girder. The running tracks are laid on the running track pad beams and are perpendicular to the track pad beams. The running tracks are connected to the top plate of the 0# block box girder by precision-rolled threaded steel bars and washers and nuts that match the precision-rolled threaded steel bars.

[0025] 2) Install the main truss:

[0026] The main truss consists of two sets, each with two sections. The main truss is hoisted onto the running track and sits on the running track via a set of reverse-locking wheels. The main truss and the running track are connected by a rolling mechanism.

[0027] 3) After installation of the hanger:

[0028] There are two sets of rear hangers, one set on each side of the left and right sides, with two hangers in each set. The two rear hangers in each set are symmetrically distributed along the transverse bridge axis about the longitudinal bridge axis. The upper ends of the two rear hangers (12) with the same structure are fixed to the top plate on one side of the 0# block box girder by washers and nuts. The lower ends of the two rear hangers with the same structure are fixedly connected to the two ends of the rear lower crossbeam by washers and nuts. The rotation axis of the two rear hangers with the same structure is perpendicular to the top plate of the 0# block box girder.

[0029] 4) Install the lower crossbeam:

[0030] There are two rear lower crossbeams, one on each side. The rear hanger is inserted into the through holes at both ends of the rear lower crossbeam. The rear hanger extends downward from both ends of the lower crossbeam and is connected to the rear lower crossbeam using perforated steel plates and nuts that match the precision rolled threaded steel bars. The rear lower crossbeam is horizontal and perpendicular to the longitudinal direction of the bridge.

[0031] 5) Install the upper crossbeam before installation:

[0032] There are two front upper crossbeams, one on each of the left and right side hanging baskets. The front upper crossbeams are hoisted onto the horizontal No. 1 precast steel beam at the upper end of the two main trusses. The front upper crossbeams are perpendicular to the two main trusses on the same side. The contact point between the front upper crossbeams and the two main trusses is welded.

[0033] 6) Install the front hanger:

[0034] There are two sets of front hangers, one set on each side, with a total of four hangers in each set. The front hangers are inserted into the through holes on the upper front crossbeam from bottom to top. The protruding ends of the front hangers from the through holes of the upper front crossbeam are connected to the upper front crossbeam through perforated steel plates and nuts that match the precision rolled threaded steel bars. The front hangers are in a vertical position and are on the same straight line along the transverse direction. The lower ends of the front hangers are at the same height and are connected to the lower front crossbeam.

[0035] 7) Install the front lower crossbeam:

[0036] There are two front lower crossbeams, one on each side. The front lower crossbeams are hoisted directly below the front hanger rod. Then, the front hanger rod is inserted into the through hole on the front lower crossbeam from top to bottom. The protruding end of the front lower crossbeam is connected to the front lower crossbeam through a perforated steel plate and a nut that matches the precision rolled threaded steel. The front lower crossbeam is horizontal and directly below the front upper crossbeam. The front lower crossbeam is parallel to the front upper crossbeam and parallel to the rear lower crossbeam. The two ends of the front lower crossbeam and the rear lower crossbeam are aligned. The front lower crossbeam is higher than the rear lower crossbeam. The ratio of its height difference to its horizontal distance is the slope of the hanging basket bottom formwork of the current pouring segment.

[0037] 8) Install the base plate longitudinal beams:

[0038] There are two sets of bottom plate longitudinal beams, one set on each side, with a total of 9 beams in each set. The bottom plate longitudinal beams are installed one by one on top of the front lower crossbeam and the rear lower crossbeam. The bottom plate longitudinal beams are arranged along the longitudinal direction of the bridge. The bottom plate longitudinal beams and the front lower crossbeam and the rear lower crossbeam are perpendicular to each other. The transverse bridge spacing of the 9 bottom plate longitudinal beams on each side is 30cm below the web and 50cm at other positions. The bottom plate longitudinal beams on the same side are in the same plane and the front and rear ends of the bottom plate longitudinal beams are on the same straight line in the longitudinal direction of the bridge. The bottom plate longitudinal beams are connected to the front lower crossbeam and the rear lower crossbeam by welding.

[0039] 9) Install the hanging basket bottom template:

[0040] The hanging basket bottom formwork consists of two pieces, one on each side. The hanging basket bottom formwork is installed on the longitudinal beam of the bottom plate, so that the longitudinal direction of the hanging basket bottom formwork is the same as the longitudinal direction of the bridge. The width of the hanging basket bottom formwork is aligned with the width boundary of the bottom plate of the 0# block box girder. The hanging basket bottom formwork is connected to the longitudinal beam of the bottom plate by welding.

[0041] 10) Install the side templates for the hanging basket:

[0042] The hanging basket side template consists of two sets, one set on the left and one set on the right, with two pieces in each set. The steel plate used for the hanging basket side template has the same thickness as the hanging basket bottom template, and the longitudinal bridge length of the hanging basket side template is the same as that of the hanging basket bottom template. After installation, the hanging basket side template is tightly attached to the outer side of the bridge web and the outer side of the flange plate. One hanging basket bottom template and two hanging basket side templates on the same side of the pier are welded together.

[0043] The installation of the leveling instrument mentioned in the technical solution refers to:

[0044] 1) Set up temporary leveling control points

[0045] The known elevation of the national elevation control point is transferred to the vicinity of the construction site and marked as a temporary leveling control point. This requires a professional surveying team to operate according to the principles of leveling. The temporary leveling control point must have a wide field of view and be able to observe the overall construction of the bridge.

[0046] 2) Setting up the level instrument

[0047] The leveling rod with a bubble level is placed vertically on the temporary leveling control point, and the leveling rod is manually adjusted until the bubble level on the leveling rod is centered.

[0048] Choose a solid ground with a wide field of view that allows simultaneous observation of the leveling rod and the hanging basket. Stable the tripod on the ground and adjust it until it is stable. Mount the Leica NAK2 level on the tripod and level the level.

[0049] The installation of the hanging basket deformation testing device mentioned in the technical solution refers to:

[0050] 1) Drill holes at the locations to be monitored on the bottom template of the hanging basket:

[0051] First, the test points on the bottom template of the basket need to be determined;

[0052] After the test points are selected, drill holes at the test positions on the bottom template of the hanging basket. The diameter of the drill hole is 1-5 mm larger than the diameter of the eye bolt thread and smaller than the diameter of the eye bolt head, so that the eye bolt thread can be inserted from bottom to top and remain in the drill hole.

[0053] 2) Install the eye bolts:

[0054] Insert the bolt of the eye bolt into the drilled hole at the position to be tested on the bottom template of the hanging basket from bottom to top. Put the washer on the bolt of the eye bolt that extends out of the bottom template of the hanging basket. Then put the nut that matches the eye bolt on the bolt of the eye bolt that extends out of the washer. Tighten the nut until the eye bolt and the bottom template of the hanging basket are tightly connected.

[0055] 3) Connect the upper end of the wire rope to the eye bolt:

[0056] After passing the upper end of the wire rope through the inner hole of the copper ring and the eye bolt from bottom to top, pass the upper end of the wire rope through the inner hole of the copper ring from top to bottom again. When the length of the upper end of the wire rope passing through the copper ring exceeds the lower edge of the copper ring by 1 to 5 cm, use pliers to flatten the copper ring so that the copper ring and the wire rope inside it are firmly secured and do not slip relative to each other.

[0057] 4) Connect the lower end of the steel wire to the lifting ring counterweight:

[0058] Place another copper ring directly above the ring in the weighted ring. Pass the lower end of the steel wire rope through the copper ring and the inner hole of the weighted ring from top to bottom. Then, pass the lower end of the steel wire rope through the inner hole of the copper ring from bottom to top again. Adjust the height of the weighted ring so that the scale on the weighted ring is within the observation range of the level instrument. Make the lower end of the steel wire rope extend 1-5 cm beyond the upper edge of the copper ring. Use pliers to flatten the copper ring until the steel wire rope is firmly fixed to the inner wall of the copper ring and there is no relative slippage.

[0059] Under the influence of gravity, the weight on the ring is perpendicular to the horizontal plane, and the scale lines on the weight are parallel to the horizontal plane.

[0060] The elevation reading at the S1 scale line before preloading of the hanging basket mentioned in the technical solution refers to:

[0061] The deformation of the bottom template of the hanging basket on the same side is taken as the average value of the deformation measured by three hanging basket deformation testing devices:

[0062] Adjusting the level instrument to its field of view allows simultaneous observation of the scale lines on the leveling rod and the weighted ring.

[0063] Let the elevation at the temporary leveling control point be H0. Before the hanging basket is preloaded, observe the reading of the leveling rod erected at the temporary leveling control point using a leveling instrument and record this reading as H1. Adjust the observation angle of the leveling instrument and observe the scale line on the hanging ring weight and record this scale line as S1. Then the elevation at the S1 scale line is H0+H1.

[0064] Before the preloading of the hanging basket, the deformation monitoring devices of the six hanging baskets need to be read, and the process is as described above.

[0065] The elevation reading at the S2 scale line after the preloading of the hanging basket mentioned in the technical solution refers to:

[0066] 1) Pre-stressing of hanging basket

[0067] The preloading of the hanging basket must be carried out symmetrically, that is, the hanging baskets on both sides are preloaded at the same time. The maximum segment weight of the bridge is equivalently replaced by sandbag or water bag loads, and then applied evenly to the bottom formwork of the hanging basket in stages. The weight of the sandbags or water bags applied is 80%, 100%, and 120% of the maximum segment weight of the bridge. When the applied load reaches 120% of the maximum segment weight of the bridge and the bottom formwork of the hanging basket does not continue to deform within 24 hours, the unloading can be carried out step by step.

[0068] 2) Elevation reading at the S2 mark after preloading

[0069] When the weight of the applied sandbags or water bags reaches 120% of the maximum weight of the bridge segment and the formwork does not continue to deform within 24 hours, the deformation monitoring device of the formwork can be read.

[0070] Let the elevation at the temporary leveling control point be H0. When the load is 120% of the maximum segment weight of the preloaded bridge with hanging basket and the bottom formwork of the hanging basket does not continue to deform within 24 hours, the reading of the leveling rod erected at the temporary leveling control point is measured by the leveling instrument and recorded as H2. Adjust the observation angle of the leveling instrument and observe the scale on the weighted ring and record this scale as S2. Then the elevation at the S2 scale line is H0+H2.

[0071] The elevation reading at the S3 scale line after the hanging basket is unloaded, as mentioned in the technical solution, refers to:

[0072] 1) Unloading the hanging basket

[0073] Use a crane to lift sandbags or water bags off the hanging basket one by one, with the unloading sequence being the reverse of the loading sequence;

[0074] 2) Elevation reading at the S3 scale line after unloading

[0075] After the load on the hanging basket has been unloaded and the bottom template of the hanging basket is stable and no longer deformed, the deformation monitoring device of the hanging basket is read again.

[0076] Let the elevation of the temporary leveling control point be H0. Observe the reading of the leveling rod erected at the temporary leveling control point using a leveling instrument and record this reading as H3. Adjust the observation angle of the leveling instrument and observe the scale line on the weighted ring. Record this scale line as S3. Then the elevation at the S3 scale line is H0+H3.

[0077] The determination of the deformation of the hanging basket mentioned in the technical solution refers to:

[0078] 1) Elastic deformation at the monitoring location of the hanging basket

[0079] Before preloading with the hanging basket, the elevation at the S1 mark on the lifting ring is H0+H1. After the hanging basket preloads the maximum segment of the bridge with 120% of its weight and stabilizes for 24 hours without deformation, the elevation at the S2 mark on the lifting ring is H0+H2, and the elevation at the S1 mark on the lifting ring is H0+H2+S1-S2. Therefore, the sum of the elastic deformation and plastic deformation of the hanging basket is H1-H2+S2-S1.

[0080] After the basket bottom template is stabilized and does not deform after the basket is unloaded, the elevation at the S3 mark on the hanging ring weight is H0+H3. At this time, the elevation at the S1 mark on the hanging ring weight is H0+H3+S1-S3, and the elastic deformation of the basket to be monitored is H1-H3+S3-S1.

[0081] 2) Plastic deformation at the monitoring location of the hanging basket

[0082] The plastic deformation at the monitoring location of the hanging basket is the difference between the elevation at the S1 scale line after the hanging basket bottom template remains unchanged for 24 hours after the maximum weight of the hanging basket preloaded bridge is 120% and the elevation at the S1 scale line after unloading and stabilization, specifically H3-H2+S2-S3.

[0083] A hanging basket deformation testing device for a hanging basket deformation testing method includes a nut, a flat washer, a lifting eye bolt, two identical copper rings, a steel wire rope, and a lifting eye weight;

[0084] The nut is a hollow, hexagonal prism-shaped metal part with internal threads in its central hole. The inner diameter of the nut is the same as the diameter of the eye bolt's shank. The flat washer is a ring-shaped metal part with an inner diameter larger than the diameter of the eye bolt's shank but smaller than the diameter of the bolt head. The eye bolt consists of a shank, bolt head, and eye. It is manufactured as a single piece using a quenching process. The eye is a ring-shaped steel ring, with its bottom end fixedly connected to the center of the bolt head's top. The axis of rotation of the steel ring intersects perpendicularly with the axis of symmetry of the bolt head. The bolt head is a cylindrical steel part with a certain height, and its diameter is larger than the shank's diameter but smaller than the eye's inner diameter. The shank is a cylinder with external threads. The copper ring is a ring-shaped copper component with an inner diameter sufficient to allow two steel wire ropes to be inserted smoothly and simultaneously. The wall thickness of the copper ring is 1–2 mm, and its height is 1–2 cm. The steel strand is made of 304 stainless steel, a standard part, with a diameter of 1.2mm. The lifting ring counterweight consists of a main body and a lifting ring. The lifting ring counterweight is made of 304 stainless steel and is a non-standard part. The main body is a cylinder with graduation lines. In this embodiment, the main body is 20cm high and 5cm in diameter, with a graduation accuracy of 1mm. The graduation lines are aligned at the left end, and the measuring range increases from bottom to top. That is, the 0cm graduation line is on the bottom surface of the lifting ring counterweight main body, and the 20cm graduation line is on the top surface of the lifting ring counterweight main body. The graduation lines are on the surface of the lifting ring counterweight main body and parallel to the horizontal plane. The lifting ring is a circular stainless steel ring, which is on top of the main body. That is, the bottom end of the lifting ring is fixedly connected to the center of the top end of the main body. The rotation axis of the lifting ring is perpendicular to the rotation axis of the main body. The lifting ring and the top end of the main body are made by integral casting. The graduations on the main body are achieved by laser engraving.

[0085] After the upper end of the wire rope passes through the inner hole of the copper ring and the eye bolt, the upper end of the wire rope passes through the inner hole of the copper ring again. The copper ring is flattened with pliers to make the wire rope and the copper ring tightly connected. After the lower end of the wire rope passes through the inner hole of the second copper ring and the eye counterweight in sequence, the lower end of the wire rope passes through the inner hole of the second copper ring again. The second copper ring is flattened with pliers to make the wire rope and the eye counterweight tightly connected.

[0086] Because the wire rope and the weight are vertical under the action of gravity, the scale lines on the weight are horizontal.

[0087] Compared with the prior art, the beneficial effects of the present invention are:

[0088] 1. Theoretically, the hanging basket deformation test method described in this invention has high measurement accuracy. This test method directly uses a high-precision automatic level instrument for reading by the operator. The test device is always fixed at the test position of the hanging basket template throughout the entire hanging basket pre-compression process. The measured hanging basket deformation value is always obtained from the same position by the same test device. The test accuracy can be controlled within 1mm, which meets the relevant test specifications.

[0089] 2. Structurally, the test device used in the hanging basket deformation test method of the present invention has readily available materials for each component, simple and reasonable connection, and good resistance to external interference;

[0090] 3. From a compatibility perspective, the hanging basket deformation testing method and testing device described in this invention are applicable to various types of hanging baskets. This testing device can test the deformation at any position of the hanging basket and is adaptable to various geographical environments below the hanging basket, especially suitable for cross-river bridges and cross-highway bridges. Attached Figure Description

[0091] The invention will now be further described with reference to the accompanying drawings:

[0092] Figure 1 This is a side view showing the connection relationship between the hanging basket deformation testing device and the bottom template of the hanging basket used in the hanging basket deformation testing method of the present invention.

[0093] Figure 2 This is a front view of the connection relationship between the hanging basket deformation testing device and the hanging basket bottom template used in the hanging basket deformation testing method of the present invention.

[0094] Figure 3 This is an enlarged view of the structure of the hanging basket deformation testing device used in the hanging basket deformation testing method of the present invention.

[0095] Figure 4 This is a flowchart of a hanging basket deformation testing method according to the present invention;

[0096] In the diagram: 1. Nut, 2. Flat washer, 3. Eye bolt, 4. Copper ring, 5. Steel wire rope, 6. Eye counterweight, 7. Hanging basket bottom formwork, 8. Base plate longitudinal beam, 9. Front lower crossbeam, 10. Rear lower crossbeam, 11. Front hanger, 12. Rear hanger, 13. Front upper crossbeam, 14. Main truss, 15. Traveling track, 16. #0 box girder, 17. Pier, A. Hanging basket deformation testing device, C. Upper end of steel wire rope, D. Lower end of steel wire rope. Detailed Implementation

[0097] The present invention will now be described in detail with reference to the accompanying drawings:

[0098] See Figure 3The hanging basket deformation testing device A used in the hanging basket deformation testing method of the present invention includes a nut 1, a flat washer 2, a lifting eye bolt 3, two identical copper rings 4, a steel wire rope 5, and a lifting eye weight 6.

[0099] Nut 1 is a fastener with internal threads that is used in conjunction with a bolt. It is hexagonal prism in shape, made of 304 stainless steel, and is a standard part. The standard adopted is GB / T 6170-2000. Its model is M20, which means that the internal thread diameter of the nut is 20mm. The internal thread diameter of nut 1 is the same as the bolt diameter of eye bolt 3.

[0100] Flat washer 2 is a circular metal part made of 304 stainless steel. It is a standard part conforming to the standard GB / T 95-2002. Its dimensions are: inner diameter 22mm, outer diameter 37mm, and thickness 3mm. Its inner diameter is larger than the diameter of the bolt shank of eye bolt 3 but smaller than the diameter of the bolt head on eye bolt 3. The function of flat washer 2 is to distribute pressure and protect the connection surface.

[0101] The eye bolt 3 is a standard part, consisting of a screw, a bolt head, and an eye. It is manufactured as a single piece using a quenching process. The eye is a circular steel ring, with its bottom end fixedly connected to the center of the top of the screw. The axis of rotation of the steel ring intersects perpendicularly with the axis of symmetry of the screw. The bolt head is a cylindrical steel part with a certain height; its diameter is greater than the screw diameter but smaller than the inner diameter of the eye. The screw is a cylinder with external threads. In this embodiment, the eye bolt 3 is made of 304 stainless steel, model M20X30, meaning the screw length is 30mm, the screw diameter is 20mm, the inner diameter of the eye is 41mm, and the eye thickness is 15mm.

[0102] The eye bolt 3, nut 1, and flat washer 2 are used together to connect and fix the components. The specific connection is as follows: Drill a hole at the location to be measured on the bottom template 7 of the hanging basket. The diameter of the hole is 1-5 mm larger than the diameter of the bolt of the eye bolt 3. Place the flat washer 2 on the upper surface of the template at the location to be measured on the bottom template 7. Take out the eye bolt 3 and insert its bolt from bottom to top into the drilled hole and the flat washer 2. When the bolt head of the eye bolt 3 is in contact with the lower surface of the location to be measured on the bottom template 7, take out the nut 1 and put the nut 1 on the bolt. Tighten the nut 1 until the lower surface of the nut 1 contacts the upper surface of the flat washer 2. Continue to tighten the nut 1 to firmly fix the eye bolt 3 on the bottom template 7 of the hanging basket.

[0103] The copper ring 4 is a copper component shaped like a ring. It is made of brass and is a non-standard part. When the copper ring 4 is stationary on a horizontal plane, its inner diameter is parallel to the horizontal plane. Its height is 1 to 2 cm and its wall thickness is 1 to 2 mm.

[0104] The inner diameter of the copper ring 4 can ensure that two steel wire ropes 5 can be inserted smoothly at the same time. After the two steel wire ropes 5 are inserted into the copper ring 4, use pliers to squeeze the copper ring 4 tightly until it is deformed and tightly wraps the steel wire ropes 5 so that the steel wire ropes 5 and the copper ring 4 do not slip.

[0105] The wire rope 5 is made of 304 stainless steel, a standard part with a diameter of 1.2mm and a safe load capacity of 15 kg. The length of the wire rope 5 needs to be cut according to the actual situation. The function of the wire rope 5 is to connect the eye bolt 3 and the eye counterweight 6 through the copper ring 4.

[0106] The connection between the wire rope 5 and the eye bolt 3 is as follows: the upper end C of the wire rope is inserted into the copper ring 4 from bottom to top, and then continues to pass through the eye on the eye bolt 3. The upper end C of the wire rope passing through the eye on the eye bolt 3 is then inserted into the copper ring 4 from top to bottom. The length of the upper end C of the wire rope extending from the bottom of the copper ring 4 after being inserted into the copper ring 4 is controlled to be 1 to 5 cm. The copper ring 4 is flattened with pliers until the wire rope 5 inside the copper ring 4 does not slip relative to the inner wall of the copper ring 4.

[0107] The lifting ring counterweight 6 consists of a main body and a lifting ring. The lifting ring counterweight 6 is made of 304 stainless steel and is a non-standard part. The main body is a graduated cylinder. In this embodiment, the cylinder is 20cm high and 5cm in diameter. The graduation accuracy on the main body is 1mm, with the graduation lines aligned at the left end. The measuring range increases from bottom to top; that is, the 0cm graduation is on the bottom surface of the main body, and the 20cm graduation is on the top surface. The graduation lines are on the surface of the main body and parallel to the horizontal plane. The lifting ring is a circular stainless steel ring, fixed to the main body at the center of its bottom end and the top end of the main body. The rotation axis of the ring intersects perpendicularly with the rotation axis of the main body. The ring and the top end of the main body are integrally cast, and the graduations on the main body are achieved by laser engraving.

[0108] The lifting ring counterweight 6 is connected to the steel wire rope 5 via a copper ring 4. The connection is as follows: the D end of the steel wire rope 5 is inserted from top to bottom into the second copper ring 4 with the same structure, and then continues to be inserted into the lifting ring on the lifting ring counterweight 6. After being inserted into the lifting ring on the lifting ring counterweight 6, the D end of the steel wire rope 5 is continued to be inserted from bottom to top into the copper ring 4. The length of the D end of the steel wire rope 5 extending from the top of the copper ring 4 is controlled to be between 1 and 5 cm. The copper ring 4 is flattened with pliers until there is no relative slippage between the steel wire rope 5 inside the copper ring 4 and the inner wall of the copper ring 4.

[0109] In cantilever casting construction, a pair of symmetrically arranged diamond-shaped hanging baskets are required; the main structure of the diamond-shaped hanging basket includes the bottom formwork of the hanging basket 7, 9 identical bottom plate longitudinal beams 8, front lower crossbeam 9, rear lower crossbeam 10, 4 identical front hangers 11, 2 identical rear hangers 12, front upper crossbeam 13, 2 identical side formworks, 1 set of inner formwork, 2 identical main trusses 14, and 2 identical traveling tracks 15.

[0110] There are two hanging basket bottom templates 7, one on each side. The hanging basket bottom template 7 is a rectangular steel plate. The transverse width of the hanging basket bottom template 7 is the same as the width of the bottom plate of each segment of the bridge, and the longitudinal length is 1m longer than the longest segment of the bridge. The two hanging basket bottom templates 7 have the same structure. The width of the hanging basket bottom template 7 is equal to the width of the bottom plate of the 0# box girder. The longitudinal bridge length of the hanging basket bottom template 7 is longer than the longitudinal bridge length between the front lower crossbeam 9 and the rear lower crossbeam 10 and shorter than the longitudinal bridge length of the bottom plate longitudinal beam 8. The steel plate thickness is 6mm. The hanging basket bottom template 7 is laid on the upper surface of the bottom plate longitudinal beam 8 and connected to the bottom plate longitudinal beam 8 by welding.

[0111] The aforementioned bottom plate longitudinal beams 8 are straight steel pipe components with a rectangular annular cross-section. Each rhomboid hanging basket contains one set of bottom plate longitudinal beams 8, with a total of 9 beams in each set. The transverse spacing of each set of bottom plate longitudinal beams 8 is as follows: 30cm below the web of the 0# block box girder 16, and 50cm at other locations. The length of each set of bottom plate longitudinal beams 8 extends 20cm beyond the longitudinal outer edge of the front lower crossbeam 9 and the rear lower crossbeam 10. The bottom plate longitudinal beams 8 are laid on top of the front lower crossbeam 9 and the rear lower crossbeam 10, and are perpendicular to them. The front lower crossbeam 9 and the rear lower crossbeam 10 provide support for the bottom plate longitudinal beams 8. The bottom plate longitudinal beams 8 are connected to the front lower crossbeam 9 and the rear lower crossbeam 10 by welding.

[0112] The aforementioned front lower crossbeam 9 is a straight steel pipe component with an equal rectangular ring cross section. Each diamond-shaped hanging basket contains one front lower crossbeam 9. Both ends of the front lower crossbeam 9 are provided with through holes for installing the lower ends of the front hanger rods 11. The function of the front lower crossbeam 9 is to provide front support for the longitudinal beams 8 of the bottom plate. The front lower crossbeam 9 is parallel to the horizontal plane and its length direction is perpendicular to the longitudinal direction of the bridge. Its length is longer than the transverse width of the bridge. The front hanger rods 11 and the front lower crossbeam 9 are connected by a special nut. Specifically, the bottom end of the front hanger rod 11 is inserted into the through hole on the front lower crossbeam 9 and extends out from the bottom end of the through hole. A matching nut is fitted onto the threaded part of the extended end of the front hanger rod 11, and the front lower crossbeam 9 is made horizontal by adjusting the nut.

[0113] The rear lower crossbeam 10 is a straight steel pipe component with a rectangular annular cross section. Each diamond-shaped hanging basket contains one rear lower crossbeam 10. Both ends of the rear lower crossbeam 10 have through holes for installing the lower ends of the rear hangers 12. The function of the rear lower crossbeam 10 is to provide rear support for the longitudinal beams 8 of the base plate. The length and cross-sectional dimensions of the rear lower crossbeam 10 are the same as those of the front lower crossbeam 9. Spatially, the rear lower crossbeam 10 is lower than the front lower crossbeam 9. The height difference between the rear lower crossbeam 10 and the front lower crossbeam 9 is the slope of the base plate for the next concrete segment to be poured. The slope of the base plate is provided by the design unit. The connection method between the rear hanger 12 and the rear lower crossbeam 10 is the same as the connection method between the front hanger 11 and the front lower crossbeam 9, that is, a fixed connection is made using special nuts, and the rear lower crossbeam 10 is adjusted to keep it horizontal.

[0114] The front hanger 11 is a straight-bar precision-rolled threaded steel bar. In this embodiment, the front hanger 11 is a precision-rolled threaded steel bar with a diameter of 40mm. There is a set of front hangers 11 in each diamond-shaped hanging basket, with a total of 4 bars in each set. They are evenly distributed along the transverse bridge direction. The front hanger 11 is connected to the front upper crossbeam 13 and the front lower crossbeam 9 by connecting with the nut. The front hanger 11 is perpendicular to the front lower crossbeam 9 and the front upper crossbeam 13, and is perpendicular to the horizontal plane. The front hanger 11 serves to connect the front upper crossbeam 13 and the front lower crossbeam 9.

[0115] The rear hanger 12 is a straight-bar precision-rolled threaded steel bar. In this embodiment, the rear hanger 12 is a precision-rolled threaded steel bar with a diameter of 40mm. There is a set of rear hangers 12 in each diamond-shaped hanging basket, with a total of 2 bars in each set. The 2 bars in each set are symmetrically distributed along the transverse direction of the bridge. The upper end of the rear hanger 12 is connected to the top plate of the 0# block box girder 16 through a perforated steel plate and a nut. The lower end of the rear hanger 12 is connected to the rear lower crossbeam 10 through a washer and a nut. The rear hanger 12 serves to connect the rear lower crossbeam 10 and the 0# block box girder 16.

[0116] The aforementioned upper front crossbeam 13 is a straight steel pipe component with an equal rectangular ring cross section. Each diamond-shaped hanging basket contains one upper front crossbeam 13. In spatial position, the upper front crossbeam 13 is directly above the lower front crossbeam 9. The upper front crossbeam 13 is connected to one end of the main truss 14 by welding. The upper front crossbeam 13 is parallel to the horizontal plane and perpendicular to the longitudinal direction of the bridge. Both ends of the upper front crossbeam 13 are provided with vertical through holes for installing the front hangers 11, which provide connection points for the front hangers 11. The front hangers 11 are connected to the upper front crossbeam 13 by nuts. The upper front crossbeam 13 transmits the force from the front hangers to the main truss 14.

[0117] The main truss 14 is a straight steel pipe component with a rectangular annular cross section. There is one set in each rhomboid hanging basket, and each set consists of two pieces. Each main truss 14 is composed of two horizontal parallel No. 1 precast steel beams, two inclined parallel No. 2 precast steel beams, and one vertical No. 3 precast steel beam, which are bolted and welded together to form a rhomboid truss. The horizontal No. 1 precast steel beam at the lower end of the main truss 14 is located directly above the running track 15. It is equipped with anti-locking wheel sets at both ends in the longitudinal direction. The upper part of the anti-locking wheel sets is welded to the horizontal No. 1 precast steel beam at the lower end of the main truss 14. The lower end of the anti-locking wheel sets is inwardly locked in the groove of the running track 15. The anti-locking wheel sets provide support for the main truss 14 in the vertical direction and play a horizontal sliding role in the longitudinal direction of the main truss 14. The two main trusses 14 on the same side of the longitudinal bridge are welded and fixed along the transverse bridge direction using steel plate beams. The running track 15 is connected to the pre-reserved precision-rolled threaded steel above the top plate of the 0# block box girder 16 via nuts. These nuts are specially made nuts with a height of 10cm and an inner diameter of 4cm. The main trusses 14 are located directly above the web of the 0# block box girder 16 in spatial position, and the distance between the two trusses in the same group is the transverse bridge distance between the two webs of the 0# block box girder 16. The two main trusses 14 in the same group are connected by welding steel plates to enhance their stability.

[0118] The traveling track 15 is a straight steel pipe component with a uniform cross-section. Its cross-section is formed by splicing the edges of two I-beam flanges. Specifically, the webs of the two I-beams and the upper and lower flanges on the spliced ​​side form a rectangular cross-section. The flanges on the unspliced ​​side of the two I-beams provide travel conditions for the reverse-locking wheel assembly. There is one set in each diamond-shaped hanging basket, and each set has two tracks. The length of the traveling track 15 is longer than the length of the horizontal No. 1 precast steel beam at the lower end of the main truss 14 and shorter than half the longitudinal length of the No. 0 block box girder 16. Its transverse distance is the transverse distance between the webs of the No. 0 block box girder 16. The traveling track 15 sits on the surface of the beam above the web of the No. 0 block box girder 16 and is connected to the pre-reserved precision-rolled threaded steel above the top plate of the No. 0 block box girder 16 through perforated steel plates and nuts. The main truss 14 in the diamond-shaped hanging basket sits on the traveling rail 15 via the reverse-locking wheel set. The traveling rail 15 provides the reverse-locking position for the reverse-locking wheel set. When the hanging basket moves forward, the reverse-locking wheel set can slide forward on the traveling rail 15 until it reaches the designated position, and then the reverse-locking wheel set can be fixed.

[0119] The side formwork consists of two sets, one set on the left and one on the right, with two pieces in each set. The steel plate thickness used for the side formwork is the same as that of the bottom formwork 7, and the longitudinal bridge length of the side formwork is also the same as that of the bottom formwork 7. After welding, the side formwork is attached to the remaining part of the 0# block box girder 16, excluding the top and bottom outer surfaces. The bottom of the side formwork extends beyond the bottom plate of the 0# block box girder, meaning that the bottom of the side formwork is spatially lower than the height of the bottom plate of the 0# block box girder.

[0120] A pair of symmetrically arranged diamond-shaped hanging baskets are installed on the 0# box girder 16, which is cast on the pier 17.

[0121] See Figure 1 , 2 and Figure 4 The method for testing the deformation of a hanging basket includes the following steps:

[0122] 1. Assemble the hanging basket

[0123] The dimensions of each component of the hanging basket are designed by the hanging basket design unit based on the length and weight of each segment of the bridge construction. Then, the hanging basket production unit produces the basket according to the structural dimensions provided by the design unit and conducts stability tests. Only after the tests are passed can the basket be transported to the construction site for assembly.

[0124] 1) Install running rails

[0125] A running track pad beam is laid on the top plate of the 0# block box girder 16. The running track pad beam is perpendicular to the running track 15 and is laid at equal intervals along the longitudinal direction of the bridge on the top plate of the 0# block box girder 16. The running track pad beam is an I-beam. In this embodiment, the running track pad beam is 50cm long and its function is to provide support for the running track 15. There are two sets of running tracks 15, with two in each set. The running tracks 15 are laid on the running track pad beam. The pre-reserved precision-rolled threaded steel bars on the top plate of the 0# block box girder 16 are inserted into the through holes on the running tracks 15, and the running tracks 15 are connected to the 0# block box girder 16 by the perforated steel plate and the matching nuts of the precision-rolled threaded steel bars.

[0126] 2) Install the main truss

[0127] There are two sets of main trusses 14, each set consisting of 2 pieces. The two sets of main trusses 14 are installed symmetrically on the left and right sides. The main trusses 14 are hoisted above the running rails 15 and placed on the two sets of running rails 15. The two sets of main trusses 14 are connected to the two sets of running rails 15 by a set of reverse-locking wheels.

[0128] 3) Install the hanger rod

[0129] There are two sets of rear hangers 12, one set on each side, with two hangers in each set. The two rear hangers 12 in each set are symmetrically distributed along the transverse bridge axis about the longitudinal bridge axis. The upper end of the rear hanger 12 is connected to the top plate of the 0# block box girder 16 through a perforated steel plate and a matching nut for the precision rolled threaded steel. The lower ends of the two rear hangers 12 with the same structure are fixedly connected to both ends of the rear lower crossbeam 10 through washers and nuts. The rear hangers 12 are in a vertical state after connection.

[0130] 4) Install the lower crossbeam

[0131] There are two rear lower crossbeams 10, one on each side. Rear hangers 12 are inserted into the through holes at both ends of the rear lower crossbeams 10. The rear hangers 12 are connected to the rear lower crossbeams 10 by a perforated steel plate and a matching nut for the precision rolled threaded steel bar. The rear lower crossbeams 10 are adjusted to a horizontal state by turning the matching nut for the precision rolled threaded steel bar. The rear lower crossbeams 10 are perpendicular to the longitudinal direction of the bridge.

[0132] 5) Install the front upper crossbeam

[0133] There are two front upper crossbeams 13, one on each side. The front upper crossbeams 13 are hoisted onto the horizontal No. 1 precast steel beam at the top of the two main trusses 14. The front upper crossbeams 13 are adjusted so that their beam length is along the transverse direction of the bridge, that is, the front upper crossbeams 13 are perpendicular to the two main trusses 14 on the same side. Then the contact points between the front upper crossbeams 13 and the main trusses 14 are welded.

[0134] 6) Install the front suspension rod

[0135] There are two sets of front hanger rods 11, one set on each side, with a total of four rods in each set. The front hanger rods 11 are inserted into the through holes on the upper front crossbeam 13 from bottom to top. The protruding ends of the front hanger rods 11 from the through holes of the upper front crossbeam 13 are connected to the upper front crossbeam 13 through perforated steel plates and nuts that match the precision rolled threaded steel bars. After connection, the front hanger rods 11 are in a vertical position and are on the same straight line along the transverse direction. After installation, the lower ends of the front hanger rods 11 are at the same height. The lower ends of the front hanger rods 11 are connected to the lower front crossbeam 9 through perforated steel plates and nuts that match the precision rolled threaded steel bars, just like the upper ends.

[0136] 7) Install the front lower crossbeam

[0137] There are two front lower crossbeams 9, one on each side. The front lower crossbeams 9 are hoisted directly below the front hanger 11. Then, the front hanger 11 is inserted into the through hole on the front lower crossbeam 9 from top to bottom. The protruding end of the front lower crossbeam 9 is connected to the front lower crossbeam 9 through a perforated steel plate and a nut that matches the precision rolled threaded steel. After the front lower crossbeam 9 is connected to the front hanger 11, the nut is adjusted to make the front lower crossbeam 9 horizontal. After adjustment, the front lower crossbeam 9 is directly below the front upper crossbeam 13, and the beam length of the front lower crossbeam 9 is along the transverse direction of the bridge. The front lower crossbeam 9 and the rear lower crossbeam 10 are parallel to each other, and their two ends are aligned. The front lower crossbeam 9 is higher than the rear lower crossbeam 10. The ratio of its height difference to its horizontal distance is the slope of the hanging basket bottom formwork 7 of the current pouring segment.

[0138] 8) Install the longitudinal beams of the base plate

[0139] There are two sets of bottom plate longitudinal beams 8, one set on each side, with a total of 9 beams in each set. The bottom plate longitudinal beams 8 are hoisted one by one onto the front lower crossbeam 9 and the rear lower crossbeam 10. The bottom plate longitudinal beams 8 are arranged along the longitudinal direction of the bridge. The bottom plate longitudinal beams 8, the front lower crossbeam 9 and the rear lower crossbeam 10 are perpendicular to each other. The transverse bridge spacing of the 9 bottom plate longitudinal beams 8 on each side is 30cm below the web and 50cm at other positions. After the bottom plate longitudinal beams 8 are installed, the bottom plate longitudinal beams 8 on the same side are in the same plane and the front and rear ends of the bottom plate longitudinal beams 8 in the longitudinal direction are on the same straight line. After the bottom plate longitudinal beams 8 are adjusted, they are connected to the front lower crossbeam 9 and the rear lower crossbeam 10 by welding.

[0140] 9) Install the hanging basket bottom template

[0141] There are two hanging basket bottom formwork 7, one on each side; the hanging basket bottom formwork 7 is hoisted onto the bottom plate longitudinal beam 8, and then the position of the hanging basket bottom formwork 7 is adjusted so that the longitudinal direction of the hanging basket bottom formwork 7 is the same as the longitudinal direction of the bridge, and the width of the hanging basket bottom formwork 7 is aligned with the bottom plate width boundary of the 0# block box girder 16. After the adjustment is completed, the hanging basket bottom formwork 7 is connected to the bottom plate longitudinal beam 8 by welding.

[0142] 10) Install the side templates of the hanging basket

[0143] There are two sets of side formwork for the hanging basket, one set on each side, with two pieces in each set. The steel plate thickness used for the side formwork is the same as that of the bottom formwork 7. The longitudinal bridge length of the side formwork is also the same as that of the bottom formwork 7. After installation, the side formwork is tightly attached to the outer side of the web and the outer side of the flange of the bridge. One bottom formwork 7 and two side formwork pieces on the same side of the pier 17 are welded together. The formwork that is welded together is called the outer formwork. The function of the outer formwork is to provide support for the subsequent concrete pouring.

[0144] 2. Set up the level instrument

[0145] 1) Set up temporary leveling control points

[0146] The known elevation of the national elevation control point is transferred to the vicinity of the construction site and marked as a temporary leveling control point. This requires a professional surveying team to operate according to the principles of leveling. The temporary leveling control point must have a wide field of view and be able to observe the overall construction of the bridge.

[0147] 2) Setting up the level instrument

[0148] The leveling rod with a bubble level is placed vertically at the temporary leveling control point, and the leveling rod is manually adjusted until the bubble level on the leveling rod is centered.

[0149] Choose a solid ground with a wide field of view that allows simultaneous observation of the leveling rod and the hanging basket. Stabilize the tripod on the ground and adjust it until it is stable. Then, mount the Leica NAK2 level on the tripod and level the level.

[0150] 3. Install the hanging basket deformation testing device.

[0151] 1) Drill holes at the locations to be monitored on the bottom template of the hanging basket:

[0152] First, it is necessary to determine the test points on the bottom formwork 7 of the hanging basket. If the length of the concrete segment to be poured is 4m, the rule for selecting the deformation test points on the bottom formwork 7 of the hanging basket is: the position is 4m away from the end of the previous tensioned concrete segment. At this position, select 3 points along the transverse direction of the bridge. The two outer points are located at both ends of the bottom formwork 7 of the hanging basket in the transverse direction of the bridge, and the one inner point is located at the center of the bottom formwork 7 of the hanging basket in the transverse direction of the bridge.

[0153] After the points are selected, drill holes at the locations to be measured on the bottom template 7 of the hanging basket. The diameter of the drilled holes is 1-5 mm larger than the diameter of the bolt of the eye bolt 3 and smaller than the diameter of the bolt head of the eye bolt 3, so that the bolt of the eye bolt 3 can be inserted from bottom to top and remain in the drilled holes.

[0154] 2) Install the eye bolts:

[0155] Insert the bolt of the eye bolt 3 into the hole to be tested on the bottom template 7 of the hanging basket from bottom to top. Put the flat washer 2 on the bolt that extends out of the bottom template 7 of the hanging basket. Then put the nut 1 that matches the eye bolt 3 on the bolt of the eye bolt 3 that extends out of the washer 2. Tighten the nut 1 until the eye bolt 3 and the bottom template 7 of the hanging basket are tightly connected.

[0156] 3) Connect the upper end of the wire rope to the eye bolt:

[0157] Pass the upper end C of the wire rope through the inner hole of the copper ring 4 from bottom to top. After passing through the copper ring 4, pass the upper end C of the wire rope through the inner hole of the eye bolt 3. Then pass the upper end C of the wire rope through the inner hole of the copper ring 4 from top to bottom. When the length of the upper end C of the wire rope passing through the copper ring 4 exceeds the lower edge of the copper ring 4 by 1 to 5 cm, use pliers to flatten the copper ring 4 until the wire rope 5 is firmly fixed to the inner wall of the copper ring 4 and there is no relative slippage.

[0158] 4) Connect the lower end of the wire rope to the lifting ring counterweight:

[0159] Place another copper ring 4 directly above the ring in the weight 6. Insert the lower end D of the steel wire rope into the inner hole of the copper ring 4 and the weight 6 from top to bottom. Then insert the lower end D of the steel wire rope into the inner hole of the copper ring 4 from bottom to top. Adjust the height of the weight 6 so that the scale on the weight 6 is within the observation range of the level instrument. Make the length of the lower end D of the steel wire rope extend 1-5 cm beyond the upper edge of the copper ring 4. Use pliers to flatten the copper ring 4 until the steel wire rope 5 is firmly fixed to the inner wall of the copper ring 4 and there is no relative slippage.

[0160] Under the influence of gravity, the weight 6 on the hanging ring is perpendicular to the horizontal plane, and the scale on the weight 6 is parallel to the horizontal plane, which ensures the accuracy of subsequent tests.

[0161] 4. Elevation reading at the S1 mark before preloading of the hanging basket

[0162] After the installation of the hanging basket deformation monitoring device A is completed, a test is conducted on the hanging basket before preloading using a level. The following test description takes the test of one device in the hanging basket deformation testing device A as an example. The deformation of the bottom template 7 of the hanging basket on the same side is taken as the average value of the deformation measured by three hanging basket deformation testing devices:

[0163] Adjusting the level instrument to its field of view allows simultaneous observation of the scale lines on the leveling rod and the weight 6;

[0164] Let the elevation at the temporary leveling control point be H0. Before the hanging basket is preloaded, observe the reading of the leveling rod erected at the temporary leveling control point using a leveling instrument and record this reading as H1. Adjust the observation angle of the leveling instrument and observe the scale line on the hanging ring weight 6. Record this scale line as S1. Then the elevation at the S1 scale line is H0+H1.

[0165] 5. Elevation reading at the S2 mark after preloading of the hanging basket

[0166] 1) Pre-stressing of hanging basket

[0167] The preloading of the hanging basket must be carried out symmetrically, that is, the hanging baskets on both sides are preloaded at the same time. The maximum segment weight of the bridge is equivalently replaced by sandbag or water bag loads, and then applied evenly to the bottom formwork 7 of the hanging basket in stages. The weight of the sandbags or water bags applied is 80%, 100%, and 120% of the maximum segment weight of the bridge. When the applied load reaches 120% of the maximum segment weight of the bridge and the bottom formwork 7 of the hanging basket does not continue to deform within 24 hours, the unloading can be carried out step by step.

[0168] 2) Elevation reading at the S2 mark after preloading

[0169] When the weight of the applied sandbags or water bags reaches 120% of the maximum weight of the bridge segment and the bottom formwork 7 of the hanging basket does not continue to deform within 24 hours, the deformation monitoring device A of the hanging basket can be read.

[0170] Let the elevation at the temporary leveling control point be H0. When the load is 120% of the maximum segment weight of the preloaded bridge and the bottom formwork 7 of the hanging basket does not continue to deform within 24 hours, the reading of the leveling rod erected at the temporary leveling control point is measured by the leveling instrument and recorded as H2. Adjust the observation angle of the leveling instrument and observe the scale on the hanging ring weight 6. Record this scale as S2. Then the elevation at the S2 scale line is H0+H2.

[0171] 6. Elevation reading at the S3 mark after unloading the hanging basket

[0172] 1) Unloading the hanging basket

[0173] Use a crane to lift sandbags or water bags off the hanging basket one by one, with the unloading sequence being the reverse of the loading sequence;

[0174] 2) Elevation reading at the S3 scale line after unloading

[0175] After the load on the hanging basket is completely unloaded and the bottom template 7 of the hanging basket is stable and no longer deformed, the deformation monitoring device A of the hanging basket is read again.

[0176] Let the elevation of the temporary leveling control point be H0. Observe the reading of the leveling rod erected at the temporary leveling control point using a leveling instrument and record this reading as H3. Adjust the observation angle of the leveling instrument and observe the scale line on the weight 6 of the hanging ring. Record this scale line as S3. Then the elevation at the S3 scale line is H0+H3.

[0177] 7. Determine the deformation of the hanging basket.

[0178] 1) Elastic deformation at the monitoring location of the hanging basket

[0179] Before the formwork is preloaded, the elevation at the S1 mark on the lifting ring weight 6 is H0+H1. After the formwork bottom template 7 of the formwork stabilizes and does not deform within 24 hours of the maximum segment of the bridge being preloaded with 120% of its weight, the elevation at the S2 mark on the lifting ring weight 6 is H0+H2, and the elevation at the S1 mark on the lifting ring weight 6 is H0+H2+S1-S2. Therefore, the sum of the elastic deformation and plastic deformation of the formwork is H1-H2+S2-S1.

[0180] After the hanging basket is unloaded and the bottom template 7 of the hanging basket is stable and does not deform, the elevation of the S3 mark on the hanging ring weight 6 is H0+H3. At this time, the elevation of the S1 mark on the hanging ring weight 6 is H0+H3+S1-S3, and the elastic deformation of the hanging basket to be monitored is H1-H3+S3-S1.

[0181] 2) Plastic deformation at the monitoring location of the hanging basket

[0182] The plastic deformation at the monitoring location of the hanging basket is the difference between the elevation at the S1 scale line after the bottom template 7 of the hanging basket does not deform within 24 hours and the elevation at the S1 scale line after unloading and stabilization, specifically H3-H2+S2-S3.

[0183] Example:

[0184] 1. Assemble the hanging basket

[0185] The hanging basket was assembled by on-site construction workers;

[0186] 2. Set up the level instrument

[0187] Set up the level instrument, take out the Southern Surveying Tripod, and place the tripod on a solid ground with a wide field of vision. Install the high-precision automatic level on the tripod so that the high-precision automatic level can simultaneously observe the temporary leveling control point and the hanging ring weight 6. Then level the high-precision automatic level.

[0188] 3. Install the hanging basket deformation testing device.

[0189] Hang the hanging basket deformation test device A at the test point on the bottom template 7 of the hanging basket, and adjust the scale on its hanging ring weight 6 to be within the observation field of the high-precision automatic level; and start taking readings before preloading.

[0190] 4. Elevation reading at the S1 mark before preloading of the hanging basket:

[0191] The elevation H0 at the temporary leveling control point is 129m. The reading H1 on the leveling rod erected at the temporary leveling control point is 1.45m. After adjusting the observation angle of the leveling instrument, the corresponding number at the S1 mark on the weight 6 is 10cm. That is, the elevation corresponding to the S1 (10cm) mark on the weight 6 is 130.45m. The principle is the principle of leveling, that is, the scale lines observed by the leveling instrument are at the same height.

[0192] 5. Elevation reading at the S2 mark after preloading of the hanging basket:

[0193] When the load is 120% of the maximum segment weight of the preloaded bridge and the bottom formwork 7 of the formwork does not continue to deform within 24 hours, the reading H2 on the leveling rod of the temporary leveling control point is 1.46m using a high-precision automatic leveling instrument. After adjusting the observation angle of the high-precision automatic leveling instrument, the number corresponding to the S2 mark on the lifting ring weight 6 is 14cm, which means the elevation corresponding to the 14cm mark on the lifting ring weight 6 is 130.46m. Then the elevation corresponding to the S1 (10cm) mark on the lifting ring weight 6 is 130.42m, which means the sum of the elastic deformation and plastic deformation caused by the 120% load of the maximum segment weight of the preloaded bridge to the bottom formwork 7 of the formwork is 3cm.

[0194] 6. Elevation reading at scale S3 after unloading the hanging basket:

[0195] After the hanging basket is unloaded, the reading H3 on the leveling rod of the temporary leveling control point is read as 1.42m using a high-precision automatic leveling instrument. The observation angle of the high-precision automatic leveling instrument is adjusted, and the number corresponding to the scale S3 on the hanging ring weight 6 is read as 9cm, meaning the elevation corresponding to the 9cm scale on the hanging ring weight 6 is 130.42m. Therefore, the elevation corresponding to the S1 (10cm) scale line on the hanging ring weight 6 is 130.43m, meaning the elastic deformation of the hanging basket bottom formwork 7 after being preloaded with a load of 120% of the bridge's maximum segment weight is 1cm, and the plastic deformation is 2cm.

[0196] 7. Determine the deformation of the hanging basket.

[0197] By obtaining the elastic deformation of the hanging basket preload, and based on the bridge design elevation and the cumulative deformation of each segment calculated by finite element method, the formwork elevation of each bridge segment can be obtained, and then the next construction stage can be carried out.

Claims

1. A device for testing deformation of a hanging basket, characterized by, The hanging basket deformation test device (A) comprises a nut (1), a flat washer (2), a lifting ring bolt (3), two copper rings (4) with the same structure, a steel wire rope (5) and a lifting ring weight (6). The nut (1) is a hollow metal piece with a hexagonal prism shape, and an internal thread is arranged on the central hole of the nut (1). The inner diameter of the nut (1) is the same as the diameter of the screw rod of the lifting ring bolt (3). The flat washer (2) is a circular ring-shaped metal piece, and the inner diameter of the flat washer (2) is greater than the diameter of the screw rod of the lifting ring bolt (3) and less than the diameter of the bolt head of the lifting ring bolt (3). The lifting ring bolt (3) is composed of a screw rod, a bolt head and a lifting ring. The lifting ring bolt (3) is integrally manufactured by quenching process. The lifting ring is a circular ring-shaped steel ring, and the bottom end of the steel ring is fixedly connected with the center of the top end of the bolt head. The rotation axis of the steel ring is perpendicular to the symmetry axis of the bolt head. The bolt head is a cylindrical steel piece with a certain height, and the diameter of the bolt head is greater than the diameter of the screw rod and less than the inner diameter of the lifting ring. The screw rod is a cylindrical body with an external thread. The copper ring (4) is a circular ring-shaped copper component, and the inner diameter of the copper ring can ensure that two steel wire ropes (5) are smoothly inserted at the same time. The wall thickness of the copper ring (4) is 1-2 mm, and the height of the copper ring (4) is 1-2 cm. The steel wire rope (5) is made of 304 stainless steel, and is a standard part with a specification of 1.2 mm, i.e. a diameter of 1.2 mm. The lifting ring weight (6) is composed of a main body and a lifting ring. The lifting ring weight (6) is made of 304 stainless steel, and is a non-standard part. The main body is a cylindrical body with scale lines. The height of the main body is 20 cm, and the diameter of the main body is 5 cm. The scale lines on the main body have an accuracy of 1 mm. The left end of the scale lines is aligned, and the range increases from bottom to top, i.e. the 0 scale line is on the bottom surface of the main body of the lifting ring weight (6), and the 20 cm scale line is on the top surface of the main body of the lifting ring weight (6). The scale lines are on the surface of the main body of the lifting ring weight (6) and are parallel to the horizontal plane. The lifting ring is a circular ring-shaped stainless steel lifting ring. The lifting ring is on the main body, i.e. the bottom end of the lifting ring is fixedly connected with the center of the top end of the main body. The rotation axis of the lifting ring is perpendicular to the rotation axis of the main body. The lifting ring and the top end of the main body are integrally cast. The scale lines on the main body are realized by laser marking. The upper end (C) of the steel wire rope passes through the inner holes of the copper ring (4) and the lifting ring of the lifting ring bolt (3), and then passes through the inner hole of the copper ring (4) again. The copper ring (4) is pinched with pliers to tightly connect the steel wire rope (5) and the copper ring (4). The lower end (D) of the steel wire rope passes through the inner holes of the second copper ring (4) and the lifting ring of the lifting ring weight (6) in sequence, and then passes through the inner hole of the second copper ring (4) again. The second copper ring (4) is pinched with pliers to tightly connect the steel wire rope (5) and the lifting ring weight (6). Due to the gravity of the lifting ring weight (6), the steel wire rope (5) and the lifting ring weight (6) are in a vertical state. The scale lines on the main body of the lifting ring weight (6) are horizontal to the horizontal plane.

2. A hanging basket deformation test method applied to the hanging basket deformation test device of claim 1, characterized by, The hanging basket deformation test method comprises the following steps: 1) Assemble the hanging basket; 2) Set up a level; 3) Install the hanging basket deformation test device (A); 4) Read the elevation at the S1 scale line before pre-pressing the hanging basket; 5) the elevation reading at S2 scale line after the hanging basket pre-pressing; 6) the elevation reading at S3 scale line after the hanging basket unloading; 7) the deformation of the hanging basket is determined.

3. The method of claim 2, wherein the method further comprises: The assembled hanging basket refers to: 1) installing the walking track: The walking track (15) is two groups, each group has two, and the walking track cushion beam is laid on the top plate of the 0# block box girder (16). The two walking track cushion beams are equidistantly arranged along the longitudinal direction of the bridge between the adjacent two walking track cushion beams. The walking track cushion beam is perpendicular to the web of the 0# block box girder (16). The walking track (15) is laid on the walking track cushion beam. The walking track (15) is perpendicular to the track cushion beam. The walking track (15) is connected with the top plate of the 0# block box girder (16) through the finished rolled threaded steel and the gasket and nut matched with the finished rolled threaded steel. 2) installing the main truss: The main truss (14) is two groups, each group has two. The main truss (14) is hoisted to the walking track (15) and is seated on the walking track (15) through the reverse buckle wheel group. The main truss (14) and the walking track (15) are connected in a rolling manner. 3) installing the rear suspender: The rear suspender (12) is two groups, one on the left side and one on the right side. Each group has two. The two rear suspenders (12) in each group are symmetrically distributed about the longitudinal axis in the transverse direction of the bridge. The upper ends of the two structurally identical rear suspenders (12) are fixed on one side of the top plate of the 0# block box girder (16) through the gasket and the nut. The lower ends of the two structurally identical rear suspenders (12) are fixedly connected with the two ends of the rear lower cross beam (10) through the gasket and the nut. The rotation axes of the two structurally identical rear suspenders (12) are perpendicular to the top plate of the 0# block box girder (16). 4) installing the rear lower cross beam: The rear lower cross beam (10) has two, one on the left side and one on the right side. The rear suspender (12) is inserted into the through hole at the two ends of the rear lower cross beam (10). The downward extending end of the rear suspender (12) from the two ends of the rear lower cross beam (10) is connected with the rear lower cross beam (10) through the hole steel plate and the nut matched with the finished rolled threaded steel. The rear lower cross beam (10) is in a horizontal state. The rear lower cross beam (10) is perpendicular to the longitudinal direction of the bridge. 5) installing the front upper cross beam: The front upper cross beam (13) has two, one on the left side and one on the right side. The front upper cross beam (13) is hoisted to the upper surface of the horizontal No. 1 prefabricated steel beam in the upper end of the two main trusses (14). The front upper cross beam (13) is perpendicular to the two main trusses (14) on the same side. The front upper cross beam (13) is connected with the two main trusses (14) by welding at the contact position. 6) installing the front suspender: The front suspender (11) has two groups, one on the left side and one on the right side. Each group has four. The front suspender (11) is inserted into the through hole in the front upper cross beam (13) from bottom to top. The extending end of the front suspender (11) from the through hole in the front upper cross beam (13) is connected with the front upper cross beam (13) through the hole steel plate and the nut matched with the finished rolled threaded steel. The front suspender (11) is in a vertical state. The front suspenders (11) are in the same straight line in the transverse direction of the bridge. The lower ends of the front suspenders (11) are at the same height. The lower ends of the front suspenders (11) are connected with the front lower cross beam (9). 7) installing the front lower cross beam: The front lower cross beam (9) has two, one on each side; the front lower cross beam (9) is hoisted to the front of the lower beam (11) directly below, and then the front lower beam (11) is inserted into the through hole of the front lower cross beam (9) from top to bottom, and the front lower cross beam (9) is connected through the hole steel plate and the matched nut of the finished rolling threaded steel and the front lower cross beam (9) from the protruding end of the through hole of the front lower cross beam (9). The front lower cross beam (9) is in a horizontal state, the front lower cross beam (9) is directly below the front upper cross beam (13), the front lower cross beam (9) is parallel to the front upper cross beam (13), the front lower cross beam (9) and the rear lower cross beam (10) are parallel to each other, the two ends of the front lower cross beam (9) and the rear lower cross beam (10) are aligned respectively, the front lower cross beam (9) is higher than the rear lower cross beam (10), and the ratio of the height difference to the horizontal distance is the slope of the current pouring segment of the hanging basket bottom formwork (7); 8) Install the bottom plate longitudinal beam: The bottom plate longitudinal beam (8) has two groups, one on each side, and each group has nine. The bottom plate longitudinal beam (8) is installed on the upper surface of the front lower cross beam (9) and the rear lower cross beam (10) one by one. The bottom plate longitudinal beam (8) is arranged along the longitudinal direction of the bridge. The bottom plate longitudinal beam (8) and the front lower cross beam (9) and the rear lower cross beam (10) are perpendicular to each other. The horizontal spacing of the nine bottom plate longitudinal beams (8) on each side is 30 cm at the bottom of the web, and the spacing at other positions is 50 cm. The bottom plate longitudinal beams (8) on the same side are in the same plane, and the front and rear ends of the longitudinal direction of the bottom plate longitudinal beam (8) are on the same straight line. The bottom plate longitudinal beam (8) is connected with the front lower cross beam (9) and the rear lower cross beam (10) by welding; 9) Install the hanging basket bottom formwork: The hanging basket bottom formwork (7) has two, one on each side. The hanging basket bottom formwork (7) is installed on the bottom plate longitudinal beam (8) so that the longitudinal direction of the hanging basket bottom formwork (7) is in the same direction as the longitudinal direction of the bridge. The width of the hanging basket bottom formwork (7) is aligned with the width of the bottom plate of the 0# box girder (16). The hanging basket bottom formwork (7) is connected with the bottom plate longitudinal beam (8) by welding; 10) Install the hanging basket side formwork: The hanging basket side formwork has two groups, one on each side, and each group has two. The thickness of the steel plate used in the hanging basket side formwork is the same as that of the hanging basket bottom formwork (7). The longitudinal length of the hanging basket side formwork is the same as that of the hanging basket bottom formwork (7). The installed hanging basket side formwork closely fits the outer side of the web and the flange plate of the bridge. The 1 hanging basket bottom formwork (7) and 2 hanging basket side formworks on the same side of the pier (17) are welded together.

4. The method of claim 2, wherein the method further comprises: The erecting level instrument refers to: 1) Set up temporary level control points The known elevation of the national elevation control point is introduced to the vicinity of the construction site and marked as a temporary level control point. Professional survey teams need to operate according to the principle of level measurement. The temporary level control point needs to have an open view and be able to observe the overall construction of the bridge; 2) Erect the level instrument The staff adjusts the staff to the center state of the bubble on the staff. Select a wide field of view can be observed at the same time the tower and basket solid ground, the tripod stable stand on the ground, adjust the tripod to stable, the model is Leica NAK2 level installed on the tripod and leveling the level.

5. The method of claim 2, wherein the method further comprises: The installation of the hanging basket deformation test device (A) refers to: 1) in the hanging basket bottom formwork to be monitored position drilling: First need to determine the hanging basket bottom formwork (7) on the test point; After the test point selection, drill holes in the test position of the hanging basket bottom formwork (7), the diameter of the drill hole is 1-5mm larger than the diameter of the screw rod of the lifting ring bolt (3) and smaller than the diameter of the head of the lifting ring bolt (3), so that the screw rod of the lifting ring bolt (3) can be inserted from bottom to top and left in the drill hole; 2) install the lifting ring bolt: Insert the screw rod of the lifting ring bolt (3) into the drill hole on the test position of the hanging basket bottom formwork (7) from bottom to top, the washer (2) is sleeved on the screw rod of the lifting ring bolt (3) protruding from the hanging basket bottom formwork (7), and then the nut (1) matched with the lifting ring bolt (3) is sleeved on the screw rod of the lifting ring bolt (3) protruding from the washer (2), and the nut (1) is screwed to tightly connect the lifting ring bolt (3) and the hanging basket bottom formwork (7); 3) connect the upper end of the steel wire rope with the lifting ring bolt: After the upper end (C) of the steel wire rope is sequentially inserted into the inner hole of the copper ring (4) and the lifting ring of the lifting ring bolt (3) from bottom to top, the upper end (C) of the steel wire rope is again inserted into the inner hole of the copper ring (4) from top to bottom, when the length of the upper end (C) of the steel wire rope inserted into the copper ring (4) exceeds the lower edge of the copper ring (4) by 1-5cm, the copper ring (4) is pinched with pliers to tightly fasten the steel wire rope (5) inside the copper ring (4) without relative sliding; 4) connect the lower end of the steel wire with the lifting ring weight: Place another copper ring (4) above the lifting ring of the lifting ring weight (6), sequentially insert the lower end (D) of the steel wire rope into the inner hole of the copper ring (4) and the lifting ring of the lifting ring weight (6) from top to bottom, and then insert the lower end (D) of the steel wire rope into the inner hole of the copper ring (4) from bottom to top, adjust the height of the lifting ring weight (6) so that the scale on the lifting ring weight (6) is within the observation range of the level, and the length of the lower end (D) of the steel wire rope exceeds the upper edge of the copper ring (4) by 1-5cm, and the copper ring (4) is pinched with pliers to tightly fasten the steel wire rope (5) and the inner wall of the copper ring (4) without relative sliding; Under the action of gravity, the lifting ring weight (6) is perpendicular to the horizontal plane, and the scale line on the lifting ring weight (6) is parallel to the horizontal plane.

6. The method of claim 2, wherein the method further comprises: The elevation reading at the S1 scale line before the hanging basket preloading refers to: The deformation of the hanging basket bottom formwork (7) on the same side is the average value of the deformations measured by the three hanging basket deformation test devices (A): Adjust the level so that the tower and the scale line on the lifting ring weight (6) can be observed at the same time within the viewing angle of the level; The elevation of the temporary leveling control point is H0, the reading of the tower standing on the temporary leveling control point is observed by the level before the hanging basket preloading, and the reading is recorded as H1, the observation angle of the level is adjusted, and the scale line on the lifting ring weight (6) is observed, and the scale is recorded as S1, and the elevation at the S1 scale line is H0+H1. The reading of the hanging basket deformation testing device (A) is required before the pre-pressing of the hanging basket, and the process is as described above.

7. The method of claim 2, wherein the method further comprises: The elevation reading at the S2 scale line after the pre-pressing of the hanging basket refers to: 1) Pre-pressing of the hanging basket The pre-pressing of the hanging basket is symmetrically performed, i.e. the hanging baskets on both sides are simultaneously pre-pressed, the maximum segment weight of the bridge is replaced by sand bags or water bags, and then the sand bags or water bags are uniformly applied in stages on the hanging basket bottom formwork (7). The weight of the applied sand bags or water bags is 80%, 100% and 120% of the maximum segment weight of the bridge. When the applied load reaches 120% of the maximum segment weight of the bridge and the hanging basket bottom formwork (7) does not continue to deform within 24 hours, the load can be unloaded in stages. 2) Elevation reading at the S2 scale line after the pre-pressing When the weight of the applied sand bags or water bags reaches 120% of the maximum segment weight of the bridge and the hanging basket does not continue to deform within 24 hours, the reading of the hanging basket deformation testing device (A) can be performed at this time. The elevation at the temporary leveling control point is H0. When the load of the hanging basket pre-pressing reaches 120% of the maximum segment weight of the bridge and the hanging basket bottom formwork (7) does not continue to deform within 24 hours, the reading of the tower scale erected at the temporary leveling control point is tested by the level, and the reading on the tower scale is recorded as H2. The observation angle of the level is adjusted, the scale on the hanging ring weight (6) is observed, and the scale is recorded as S2. The elevation at the S2 scale line is H0+H2.

8. The method of claim 2, wherein the method further comprises: The elevation reading at the S3 scale line after the unloading of the hanging basket refers to: 1) Unloading of the hanging basket The sand bags or water bags are lifted away from the hanging basket by the crane in stages, and the unloading sequence is opposite to the loading sequence. 2) Elevation reading at the S3 scale line after the unloading After the load on the hanging basket is unloaded and the hanging basket bottom formwork (7) is stable without deformation, the reading of the hanging basket deformation testing device (A) is performed again. The elevation at the temporary leveling control point is H0. The reading of the tower scale erected at the temporary leveling control point is observed by the level, and the reading is recorded as H3. The observation angle of the level is adjusted, the scale line on the hanging ring weight (6) is observed, and the scale line is recorded as S3. The elevation at the S3 scale line is H0+H3.

9. The method of claim 2, wherein the method further comprises: The determination of the deformation of the hanging basket refers to: 1) Elastic deformation at the monitoring position of the hanging basket The elevation at the S1 scale line on the hanging ring weight (6) before the pre-pressing of the hanging basket is H0+H1. After the pre-pressing of the hanging basket reaches 120% of the maximum segment weight of the bridge and is stable for 24 hours without deformation, the elevation at the S2 scale line on the hanging ring weight (6) is H0+H2. The elevation at the S1 scale line on the hanging ring weight (6) is H0+H2+S1-S2. Therefore, the sum of the elastic deformation and the plastic deformation of the hanging basket is H1-H2+S2-S1. After the unloading of the hanging basket is completed and the hanging basket bottom formwork (7) is stable without deformation, the elevation at the S3 scale line on the hanging ring weight (6) is H0+H3. At this time, the elevation at the S1 scale line on the hanging ring weight (6) is H0+H3+S1-S3. The elastic deformation at the monitoring position of the hanging basket is H1-H3+S3-S1. 2) Plastic deformation at the monitoring position of the hanging basket The plastic deformation of the hanging basket monitoring position is the difference between the elevation at the S1 scale line after the hanging basket bottom formwork (7) is not deformed within 24 hours of the hanging basket pre-pressing the bridge maximum segment 120% of the weight and the elevation at the S1 scale line after unloading and stabilizing, specifically H3-H2+S2-S3.

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