A method for controlling displacement of a double-curved large-span historical aqueduct arch ring reinforced by a middle pier

Abstract

The present application relates to the technical field of hydraulic engineering, in particular to a method for controlling displacement of a double-curvature large-span historical relic aqueduct arch ring with reconstructed middle pier and reinforced, comprising a main arch ring: a side wall of the main arch ring is fixed with reinforcing steel bars by bolts, and the reinforcing steel bars are fixed with stainless steel plates at the bottom, and the stainless steel plates are arranged on the top of the fixed elevation position; the stainless steel plates are fixed to the side wall of the main arch ring by the reinforcing steel bars, and the distance between the stainless steel plates and the fixed elevation position is less than 10 cm; the reinforcing steel bars are fixed with thermometers on the side wall. In the process of local reconstruction and reinforcement construction, the displacement of the arch ring can be detected multiple times to realize real-time displacement monitoring, which is convenient for precise control of the displacement distance, avoids detection errors during the process of only removing and reconstructing the middle pier, and causes the arch ring to settle and displace, thereby causing the reinforcement to fail, and the process of reinforcing the arch ring is finely detected to control the displacement, which is convenient for controlling the displacement safety of the arch ring. The present application improves the construction efficiency and controls the displacement accurately.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic engineering, in particular to a method for controlling displacement of a reconstructed middle pier reinforced double-curved large-span historical aqueduct arch ring. BACKGROUND

[0002] The technical idea of creating a double-curved arch bridge is to combine the traditional method of building a brick arch bridge with the construction technology of a reinforced concrete bridge that can be installed in parts, and to build a single-curved structure bridge type with flat bricks on a prefabricated reinforced concrete curved beam, with flat iron connecting the arch ribs. During the trial construction, the flat bricks were changed to arches (arch waves). Since the main arch ring is arch-shaped in both longitudinal and transverse directions, it is named as a "double-curved arch bridge".

[0003] Strengthening historical buildings provides strong technical support for restoring the original appearance of the buildings, providing protection, and prolonging the service life. Different methods are used for strengthening different historical buildings. Common strengthening techniques are generally divided into overall strengthening and local reconstruction strengthening. During the local reconstruction strengthening construction process, how to control the displacement of the building is the key to ensuring the success of the strengthening. The existing displacement control techniques mainly use sensors, micrometers, and other methods to control the load during the construction process. For particularly important bridges, once the reinforcement construction is interrupted, it will cause traffic disruption on the entire route, and there is no nearby detour route, which has a large social impact. Therefore, when designing the reinforcement scheme, a more secure, reliable, and durable reinforcement scheme that can be used for a long time and can be used once and for all should be considered.

[0004] For example, the horizontal displacement control method for a high-speed railway large-span arch bridge disclosed in the authorized Chinese invention patent CN106958187A effectively solves the problem of horizontal displacement control of a large-span deck-type railway concrete arch bridge, makes the structural design of such bridges simpler and more reasonable, and effectively reduces the investment in bridge engineering. The main bridge structural system is composed of a main arch ring, an arch pier column, and a main bridge beam. The main bridge beam is regarded as an equivalent simply supported beam that is not constrained in the horizontal direction by the arch pier column, the main arch ring is regarded as an elastic support of the arch pier column, and the main arch ring and the arch pier column are regarded as only transmitting horizontal loads to the equivalent simply supported beam.

[0005] However, the existing double-curvature large-span historical aqueduct has a large weight, and in the process of only removing and rebuilding the middle pier, the arch ring has occurred settlement displacement, causing reinforcement failure, and even catastrophic consequences, so how to control the safety of the arch ring of the double-curvature large-span historical aqueduct reinforced by rebuilding the middle pier is of great significance, the cracks of the main arch ring can be divided into two categories: longitudinal cracks and radial cracks; the longitudinal cracks are cracks that occur on the joint surface of the arch rib and the arch wave and are parallel to the axis direction of the arch, and the main reason for the generation of the longitudinal cracks is that the main arch ring has poor integrity and the horizontal displacement of the abutment is large, the radial cracks of the arch rib occur in the section near the arch top where the positive bending moment is large, and the radial cracks of the arch rib are often caused by the fact that the horizontal displacement of the abutment is too large, the positive bending moment at the arch top is greatly increased, and the tensile stress of the arch rib exceeds the ultimate tensile stress, the radial cracks of the arch back often occur in the region near the arch corner where the negative bending moment is large, and the radial cracks of the arch back often occur due to the fact that the horizontal displacement of the abutment is too large, the transverse connection is weak, the eccentrically loaded transverse tie beam of the main arch ring is easily damaged due to the large stress of the rigid connection with the main arch ring, the existing safety control process of the arch ring of the double-curvature large-span historical aqueduct reinforced by rebuilding the middle pier is relatively weak, the displacement of the arch ring is not detected in real time, the displacement change of the arch ring is not recorded, and the displacement of the reinforced arch ring is not finely detected to control the process, if the displacement of the arch ring is not monitored in time and accurate data is obtained, the reinforcement is prone to failure, and the displacement safety of the arch ring is not convenient to control, therefore, a displacement control method for the arch ring of the double-curvature large-span historical aqueduct reinforced by rebuilding the middle pier needs to be designed to solve the above problems. SUMMARY

[0006] To achieve the above object, the present application provides the following technical scheme: a displacement control method for the arch ring of a double-curvature large-span historical aqueduct reinforced by rebuilding a middle pier, comprising a main arch ring:

[0007] The side wall of the main arch ring is fixed with a steel bar through a bolt, and the bottom of the steel bar is fixed with a stainless steel plate, and the stainless steel plate is arranged on the top of the fixed elevation position;

[0008] The stainless steel plate is fixed to the side wall of the main arch ring by the steel bar, and the distance between the stainless steel plate and the fixed elevation position is less than 10 cm; a thermometer is fixed to the side wall of the steel bar;

[0009] A vernier caliper is arranged between the stainless steel plate and the fixed elevation position, and a micrometer is arranged on the side of the stainless steel plate;

[0010] Preferably, the steps are:

[0011] A mark is arranged at the fixed elevation position, the distance between the stainless steel plate and the fixed elevation position is measured by the vernier caliper, and H1 is recorded;

[0012] The micrometer is installed on the stainless steel plate, and h1 is recorded;

[0013] After the displacement of the main arch ring, the reading of the micrometer is measured, and h2 is recorded;

[0014] The distance between the stainless steel plate and the fixed elevation position is measured by using a vernier caliper, and H2 is recorded;

[0015] The displacement AH=H2-H1 and Ah=h1-h2 are calculated respectively, and AH and Ah are recorded, and the average of the two numbers is used as the reference.

[0016] Preferably, the vernier caliper is a measuring tool for measuring the distance between the stainless steel plate and the fixed elevation position by reading the distance between the two measurement surfaces separated by the relative movement of the vernier principle.

[0017] Preferably, the vernier caliper reading is adjusted to be >0.05mm.

[0018] Preferably, the specific operation steps of the vernier caliper and the micrometer are as follows:

[0019] (A1), check the vernier caliper: before measurement, wipe the surface of the caliper clean to avoid stains, start the zero adjustment of the vernier caliper, when the two measurement jaws are tightly attached, confirm that there is no gap, check whether the two measurement surfaces and the measurement edge of the caliper are straight and intact, and at the same time, the zero lines of the vernier and the main ruler should be aligned with each other;

[0020] (A2), test the vernier caliper: when moving the ruler frame, make sure that the ruler frame can move freely and there is no shaking phenomenon, first, loosen the fixing screw, move the ruler frame, then fix the ruler frame with the fixing screw, and the reading of the caliper should not change;

[0021] (A3), measurement precautions: when measuring the distance between the stainless steel plate and the fixed elevation position, the connecting line of the two measurement surfaces of the caliper should be perpendicular to the surface to be measured, and should not be inclined, secondly, do not force the caliper to be clamped on the part, which will deform the measuring jaw or cause the measuring surface to wear out prematurely, resulting in loss of accuracy of the caliper;

[0022] (A4), measurement start process: when measuring, first open the movable measuring jaw of the caliper, so that the measuring jaw can be freely clamped into the stainless steel plate and the fixed elevation position, then move the ruler frame, use slight pressure to make the movable measuring jaw contact the measuring surface, tighten the fixing screw on the micro-motion device, and then rotate the adjusting nut to make the measuring jaw contact the surface and measure and read H1 and h1 in turns;

[0023] (B1), check the micrometer: measure the error, directly rotate the knob, when the sound stops rotating, watch the displayed mark, if the alignment is not zero scale, the part needs to be subtracted during measurement, adjust the starting point before measurement, use lint-free paper to wipe the measuring surface of the anvil and the micrometer screw, and the screw micrometer is also called micrometer, which is an instrument that can accurately measure the length and radius of an object;

[0024] (B2), the method for using the micrometer: first clean the micrometer's scale and anvil, the measured piece is placed between the two working surfaces, adjust the micrometer drum, rotate the micrometer screw, and make the small anvil and the micrometer screw face just contact the two ends of the length to be measured, then the micrometer screw moves to the right by a distance, which is the measured length, the whole millimeter number is read from the fixed scale, and the decimal part is read from the movable scale, each grid on the movable scale disc is 0.01mm, after the working surface is quickly contacted with the measured piece, the measuring force device is adjusted until the sound stops.

[0025] Compared with the prior art, the beneficial effects of the present application are: in the process of local reconstruction and reinforcement construction, the large-span double-curved cultural heritage aqueduct has large weight, the displacement of the arch ring can be detected multiple times to realize real-time displacement monitoring, which facilitates precise control of the displacement distance and avoids detection errors during the process of removing and reconstructing the middle pier, which causes arch ring settlement displacement and causes reinforcement failure, so that the safety control process of the reconstructed middle pier reinforced large-span double-curved cultural heritage aqueduct is more perfect, the displacement of the arch ring is detected in real time, the displacement change of the arch ring is recorded, and the displacement of the reinforced arch ring is finely detected to control, which avoids the reinforcement failure caused by the displacement of the arch ring not being monitored in time to obtain accurate data, and facilitates the control of the displacement safety of the arch ring. The present application solves the technical problem of difficult monitoring and precise control of displacement in the construction process, improves the construction efficiency, and controls the displacement accurately. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view schematic diagram of the vernier caliper measurement state structure of the present application;

[0027] Figure 2 It is a front view schematic diagram of the micrometer measurement state structure of the present application;

[0028] Figure 3 It is a main arch ring jacking record table 1 schematic diagram of the present application;

[0029] Figure 4 It is a main arch ring jacking record table 2 schematic diagram of the present application.

[0030] In the figure: 1, main arch ring; 21, steel bar; 22, stainless steel plate; 23, fixed elevation position; 24, vernier caliper; 25, micrometer. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0032] Referring to Figures 1-4 , the present application provides an embodiment:

[0033] A method for controlling displacement of a reconstructed middle pier reinforced hyperbolic large-span historical aqueduct arch ring, comprising a main arch ring 1:

[0034] The side wall of the main arch ring 1 is fixed with a reinforcing bar 21, and the bottom of the reinforcing bar 21 is fixed with a stainless steel plate 22, which is erected on the top of a fixed elevation position 23;

[0035] The stainless steel plate 22 is fixed to the side wall of the main arch ring 1 by the reinforcing bar 21, and the distance between the stainless steel plate 22 and the fixed elevation position 23 is less than 10 cm; the reinforcing bar 21 is fixed with a thermometer on the side wall;

[0036] A vernier caliper 24 is arranged between the stainless steel plate 22 and the fixed elevation position 23, and a micrometer 25 is arranged on the side edge of the stainless steel plate 22;

[0037] and the following process:

[0038] In the reinforcement process of a certain hyperbolic historical aqueduct, the middle pier needs to be reconstructed and reinforced, and in the construction process, the stainless steel plate is fixed to the side wall of the main arch ring by the reinforcing bar, and the distance between the stainless steel plate and the fixed elevation position is less than 10 cm; the reinforcing bar is fixed with a thermometer on the side wall;

[0039] S1, marks are set at the fixed elevation position 23, the distance between the stainless steel plate 22 and the fixed elevation position 23 is measured by using the vernier caliper 24, and H1 is recorded, the vernier caliper 24 is a measuring tool for measuring the distance between the stainless steel plate 22 and the fixed elevation position 23 by reading the distance between the two measuring surfaces separated by the relative movement of the vernier principle;

[0040] S2, install the micrometer 25 on the stainless steel plate 22, and record h1, adjust the reading of the micrometer 25 to be >0.05mm;

[0041] S3, after the displacement of the main arch ring, the reading of the micrometer 25 is measured, and h2 is recorded;

[0042] S4, the distance between the stainless steel plate 22 and the fixed elevation position 23 is measured by using the vernier caliper 24, and H2 is recorded;

[0043] S5, respectively calculate the displacement △H=H2-H1 and △h=h1-h2, and record △H and △h respectively, and take the average of the two numbers as the criterion;

[0044] The specific operation steps of the vernier caliper 24 and the micrometer 25 are:

[0045] (A1), check the vernier caliper: before measurement, wipe the surface of the caliper clean, avoid the presence of stains, start vernier caliper zero calibration, when the two measuring jaws tightly, confirm that there is no existence of prominent gap, check the two measuring surface and measuring edge of the caliper is straight and intact, at the same time, the vernier and the zero line of the main ruler should be aligned with each other;

[0046] (A2), test vernier caliper: when moving the frame, make sure the frame can move freely, and there is no phenomenon of shaking, first, gently loosen the fixing screw, move the frame, then fix the scale frame with the fixing screw, the reading of the caliper should not change;

[0047] (A3), measurement matters needing attention: when measuring the distance between stainless steel plate 22 and fixed elevation position 23, the connecting line of the two measuring surfaces of the caliper should be perpendicular to the surface to be measured, and cannot be inclined, second, do not force the caliper to the part, which will deform the measuring jaw, or make the measuring surface wear prematurely, so that the caliper loses its accuracy;

[0048] (A4), measurement start process: when measuring, first open the movable measuring jaw of the caliper, so that the measuring jaw can be freely clamped into the stainless steel plate 22 and the fixed elevation position 23, then move the scale frame, and make the movable measuring jaw contact the measuring surface with slight pressure, tighten the fixing screw on the micro motion device, and then rotate the adjusting nut to make the measuring jaw contact the surface and measure H1 and h1 in turns;

[0049] (B1), check the micrometer: measure the error, directly rotate the knob, when the sound stops rotating, watch the displayed mark, if the alignment is not zero scale, the part needs to be subtracted during measurement, adjust the starting point before measurement, use the non-fuzzy paper to wipe the measuring surface of the anvil and the micrometer screw, the micrometer screw is also called micrometer 25, which is an instrument that can accurately measure the length and radius of an object;

[0050] (B2), method for using micrometer: first clean the micrometer 25 and the anvil, place the measured part between the two working surfaces, adjust the micro cylinder, rotate the micrometer screw, and make the small anvil and the micrometer screw surface just contact the two ends of the length to be measured, then the distance of the micrometer screw moving to the right is the measured length, the whole millimeter number is read from the fixed scale, and the decimal part is read from the movable scale, the movable scale disc is 0.01mm per grid, after the working surface is quickly contacted with the measured part, adjust the measuring force device until the sound stops;

[0051] For the characteristics of the internal force analysis of the dangerous old double-curved arch bridge, it is feasible to analyze the internal force by using the finite element method. A unified finite element model of the whole bridge is established, the arch superstructure and the main arch ring are connected together by using appropriate connection mode, the combined action of the arch superstructure and the main arch ring is simulated, and the position of the actual arch axis of the existing double-curved arch bridge can be measured.

[0052] By accurately monitoring the values of △H and △h, the displacement distance of the main arch ring can be judged, so that the displacement distance can be monitored in time. If the displacement data of the main arch ring is large, the position with large displacement data needs to be reinforced, the displacement of the main arch ring is controlled by the reinforcement mode, generally the strength and stability of the column will not be a problem, if insufficient, the method of increasing longitudinal and transverse beams or wrapping carbon fiber can be used for treatment, the local concrete at the end of the column can be crushed, the method of wrapping steel mesh to increase the column section can be used for treatment, the effective reinforcement mode can be judged, the effective reinforcement mode is judged, the displacement of the reinforcement arch ring is finely detected to control the process, so as to avoid the reinforcement failure caused by the displacement of the arch ring without timely monitoring of accurate data, and the displacement safety of the arch ring is convenient to control.

[0053] It is apparent to those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, but can be implemented in other particular forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the present application being defined by the appended claims rather than the foregoing description, and it is intended to include all changes falling within the meaning and scope of the equivalent elements of the claims.

Claims

1. A method for controlling the displacement of the arch ring of a hyperbolic long-span aqueduct in the reconstruction of a central pier, characterized in that... Including the main arch (1): The sidewall of the main arch ring (1) is fixed with steel bars (21) by bolts, and stainless steel plate (22) is fixed at the bottom of the steel bars (21). The stainless steel plate (22) is erected on the top of the fixed elevation position (23). Stainless steel plate (22) is fixed to the side wall of the main arch ring (1) using steel bars (21), and the distance between stainless steel plate (22) and fixed elevation position (23) is less than 10cm; thermometer is fixed to the side wall of steel bars (21); A vernier caliper (24) is installed between the stainless steel plate (22) and the fixed elevation position (23), and a micrometer (25) is installed on the side of the stainless steel plate (22); The steps are as follows: S1, set a mark at a fixed elevation position (23), use a vernier caliper (24) to measure the distance between the stainless steel plate (22) and the fixed elevation position (23), and record H1; S2. Install a micrometer (25) on the stainless steel plate (22) and record h1; S3. After the main arch ring is displaced, measure the micrometer (25) reading and record h2; S4. Use a vernier caliper (24) to measure the distance between the stainless steel plate (22) and the fixed elevation position (23), and record H2; S5. Calculate the displacements ΔH = H2 - H1 and Δh = h1 - h2 respectively, and record ΔH and Δh respectively, taking the average of the two values ​​as the standard; The vernier caliper (24) is a measuring tool that uses the vernier principle to read the distance between the relative movement of two measuring surfaces, thereby measuring the distance between the measuring stainless steel plate (22) and the fixed elevation position (23).

2. The method for controlling the displacement of the arch ring of a hyperbolic large-span aqueduct for reconstruction and reinforcement according to claim 1, characterized in that: Adjust the micrometer (25) reading to >0.05mm.

3. The method for controlling the displacement of the arch ring of a hyperbolic large-span aqueduct for reconstruction and reinforcement according to claim 1, characterized in that, The specific operating steps for the vernier caliper (24) and micrometer (25) are as follows: (A1) Check the vernier caliper: Before measurement, wipe the surface of the caliper clean to avoid stains. Start the zeroing of the vernier caliper. When the two measuring jaws are tightly closed, confirm that there is no protruding gap. Check whether the two measuring surfaces and measuring edges of the caliper are straight and intact. At the same time, the zero marks of the vernier and the main scale should be aligned with each other. (A2) Testing the vernier caliper: When moving the scale frame, ensure that the scale frame can move freely and there is no wobbling. First, loosen the fixing screw and move the scale frame. Then, when fixing the scale frame with the fixing screw, the reading of the caliper should not change. (A3) Measurement precautions: When measuring the distance between the stainless steel plate (22) and the fixed elevation position (23), the line connecting the two measuring surfaces of the caliper should be perpendicular to the surface to be measured and should not be tilted. Secondly, do not force the caliper to the part, as this will deform the measuring jaws or cause the measuring surface to wear prematurely, causing the caliper to lose its due accuracy. (A4) Measurement start procedure: When measuring, first open the movable measuring jaw of the caliper so that the measuring jaw can freely fit between the stainless steel plate (22) and the fixed elevation position (23). Then move the scale frame and use slight pressure to make the movable measuring jaw contact the measuring surface. Tighten the fixing screw on the micro-motion device, and then turn the adjusting nut to make the measuring jaw contact the surface and measure and read H1 and h1 in several times. (B1) Check the micrometer: measurement error, turn the knob directly, when the sound comes out stop turning, look at the displayed mark, if it is not aligned to the zero mark, the part needs to be subtracted during the measurement process, adjust the starting point before measurement, use lint-free paper to wipe the measuring surface of the anvil and the micrometer screw, the micrometer screw is also called a micrometer (25), it is an instrument that can accurately measure the length and radius of an object; (B2) How to use a micrometer: First, clean the micrometer (25) body and anvil. Place the workpiece to be measured between the two working surfaces, adjust the micrometer thimble, screw out the micrometer screw, and make the small anvil and the micrometer screw just contact the two ends of the length to be measured. The distance the micrometer screw moves to the right is the length to be measured. The whole number of millimeters of this distance is read from the fixed scale, and the decimal part is read from the movable scale. Each division on the movable scale is 0.01mm. After the working surface is about to contact the workpiece, adjust the measuring force device until you hear a sound and it stops.

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