Force-measuring sand box for rotating bridge and its application in rotating bridge construction

Abstract

The present invention belongs to a sand box for construction, and more particularly refers to a force measuring sand box for a rotating bridge and its application in the construction of a rotating bridge. The force measuring sand box for a rotating bridge comprises a lower tube filled with quartz sand and open at the top, an upper tube whose bottom is placed on the upper surface of the quartz sand and is longitudinally mounted in the lower tube, and a sand outlet pipe for controlling the outflow of quartz sand is provided at the lower side of the lower tube; the upper tube is a closed cylindrical structure composed of an upper plate, a side plate, and a bottom plate and equipped with a weight, and the elastomer is encapsulated by a cover plate on the outer surface of the upper plate of the upper tube or the outer surface of the bottom of the lower tube, and the side edge deformation part of the elastomer is matched with a force measuring element. The present invention solves the problems of cumbersome unbalanced torque measurement in the prior art. It has the advantages of safe and reliable structure and the ability to quickly and accurately obtain the unbalanced torque of the upper structure.

Description

Technical Field

[0001] The invention belongs to a sand box for construction, in particular to a force measuring sand box for a rotating bridge and the application of the sand box in the construction of the rotating bridge. Background Art

[0002] A rotating bridge is a bridge constructed using the rotation method. Specifically, it refers to the part of the bridge that crosses a river, highway, or railway, which is constructed on both sides of the river or road. The superstructure of the bridge is completed at the construction site, and then the beams on both sides of the river or road are rotated to the bridge working site. The bridge rotation technology can transform operations above obstacles into operations on the shore or near the ground, which can not only ensure the safety of engineering construction, but also reduce the impact on traffic, shorten the closure time, and reduce construction costs. With the vigorous development of transportation construction projects in recent years, more and more new bridge projects have crossed existing highways, railway lines, and rivers. In view of the high safety of the rotation method and its small impact on traffic, the vast majority of new cross-line bridges are currently constructed using the rotation method.

[0003] At present, the common bridge rotation device is mainly composed of a central support, an upper turntable support leg, a lower turntable slideway and a temporary sand box. As the core component of the rotation device, the central support bears the main weight of the upper structure; the upper turntable support leg is the insurance leg of the rotation structure, ensuring that the upper structure of the rotating bridge will not have a large vertical deflection to avoid a rollover accident; the lower turntable slideway is located below the upper turntable support leg, providing a flat running track for the support leg during the rotation construction; the sand box, as a temporary tool for the rotating structure, plays an auxiliary support role during the casting of the upper structure. Due to the structural design and construction errors of the bridge, the cantilevers on both sides of the rotating bridge are not completely symmetrical. Therefore, the rotating bridge must be weighed and counterweighted before the formal rotation operation is carried out to make the rotating structure as balanced as possible. The actual unbalanced moment of the upper structure is measured by the weighing test, and then the unbalanced moment of the structure is controlled within the safe allowable range through the counterweight operation to reduce the unbalanced moment of the upper structure and ensure the safety and stability of the structure during the rotation operation. During the weighing test of traditional rotation projects, the operator needs to estimate the eccentricity of the structure in advance, select a weighing jack of corresponding specifications, and conduct the test according to a certain graded loading. Affected by the operator's experience and the grading accuracy, the data obtained from the weighing test has certain errors. Moreover, after the weight is counterbalanced according to the original plan, it is difficult to adjust the rotating structure that has been biased to one side to a state where all the legs are suspended and the gaps are uniform.

[0004] The applicant has not found any literature reports related to the present application in domestic patent documents. Summary of the invention

[0005] The purpose of the present invention is to provide a force measuring sand box for a rotating bridge and its application in the construction of the rotating bridge, which can conveniently obtain the unbalanced moment of the structure above the sand box and then perform corresponding counterweight operations.

[0006] The overall technical concept of the present invention is:

[0007] A force measuring sand box for a rotating bridge comprises a lower cylinder containing contents and having an opening at the top, an upper cylinder with a bottom placed on the upper surface of the contents and longitudinally mounted inside the lower cylinder, and an outlet for controlling the outflow of the contents is opened at the lower side of the lower cylinder; the upper cylinder is a closed cylindrical structure composed of an upper plate, side plates and a bottom plate and filled with fillers, an elastomer is encapsulated by a cover plate on the outer surface of the upper plate of the upper cylinder or the outer surface of the bottom of the lower cylinder, and the side edge deformation portion of the elastomer is matched with the force measuring element.

[0008] Application of force measuring sand box for rotating bridge in the construction of rotating bridge.

[0009] The contents can be granular or spherical solid materials with good fluidity, such as quartz sand or steel shots.

[0010] The specific technical concepts of the present invention include:

[0011] The main function of the outlet is to facilitate the outflow of the contents, which can be achieved by means including but not limited to the following technical means, all of which do not deviate from the essence of the present invention. The outlet is a sand outlet pipe or a bin door.

[0012] In order to facilitate the control of the outflow of the contents in the sand outlet pipe, the preferred technical implementation means is that the surface of the sand outlet pipe opening is equipped with an end cover.

[0013] The preferred technical solution is that the counterweight is made of micro-expansive concrete.

[0014] When the sand box is subjected to the longitudinal load transmitted by the superstructure, the elastic body is deformed under pressure and transmits the pressure longitudinally and circumferentially, and the longitudinal force is directly transmitted to the concrete pedestal. The elastic body is preferably packaged in the following structure:

[0015] A. The top edge of the upper tube or the bottom edge of the lower tube outside the periphery of the elastic body forms a first annular retaining ring or a second annular retaining ring, and the first annular retaining ring, the top edge of the upper tube or the second annular retaining ring, the bottom edge of the lower tube and the cover plate encapsulate the elastic body;

[0016] B. The cover plate outside the periphery of the elastomer forms a third annular baffle ring, and the third annular baffle ring and the cover plate and the top of the upper tube or the bottom of the lower tube outside the periphery of the elastomer encapsulate the elastomer.

[0017] The preferred technical solution is that the elastic body is selected from one of rubber elastic body or alloy steel elastic body; the force measuring element is selected from hydraulic oil, oil pump and hydraulic dynamometer connected to the side edge of the rubber elastic body through the oil nozzle, and the pressure can be directly measured by reading the hydraulic dynamometer reading in the equilibrium state after the hydraulic oil is pressurized; or a fiber grating force measuring module matched with the deformation part of the side edge of the alloy steel elastic body is selected. The pressure is calculated by the circumferential deformation force of the elastic body measured by the force measuring element. Since the above-mentioned force measuring element and measurement method belong to the existing technology and there are mature products on the market, the applicant will not repeat its specific structure here.

[0018] The force measuring element preferably adopts the following technical implementation means: the oil nozzle or the fiber grating force measuring module is arranged in the first annular retaining ring, the second annular retaining ring or the third annular retaining ring.

[0019] In order to facilitate the lifting and transportation of the upper cylinder and the lower cylinder, the preferred technical implementation means is that the side walls of the upper cylinder and the lower cylinder are equipped with hooks.

[0020] A more preferred technical implementation means is that the hook comprises an upper hook symmetrically assembled on the side wall of the upper tube, and a lower hook symmetrically assembled on the side wall of the lower tube.

[0021] The application of the force measuring sand box for the rotating bridge in the construction of the rotating bridge includes the following process steps:

[0022] Ⅰ. When installing the swivel device, place the force measuring sand box at the designed position between the upper and lower platforms of the swivel structure;

[0023] Ⅱ. After the casting construction of the upper structure is completed, the bracket and formwork of the rotating structure are removed;

[0024] III. Read the pressure value of the force measuring sand box at different positions;

[0025] IV. According to the measured pressure values ​​of the sand boxes at different positions and the distance from the center, calculate the eccentricity of the rotating structure in the longitudinal and transverse directions of the bridge respectively;

[0026] Ⅴ. Balancing weights according to calculation results;

[0027] Ⅵ. Remove the force measuring sand box and carry out rotation operation.

[0028] The working principle of the present invention is as follows:

[0029] Affected by design factors and construction errors, the rotating structure will have a certain center of gravity offset, resulting in a corresponding unbalanced moment. When the upper structure of the rotating bridge is cast and the bracket and formwork are removed, the direction of the eccentricity of the rotating structure can be preliminarily determined by measuring the pressure measurement value of each force measuring sand box one by one, and the magnitude of the unbalanced moment of the rotating structure in the longitudinal and transverse directions of the bridge can be further calculated based on the pressure measurement values ​​of the sand boxes at different positions, and then the corresponding counterweight scheme can be formulated, and the pressure value changes of each force measuring sand box can be observed in real time during the counterweight process. By removing the sand box after replacing the weighing test and counterweight operation, the gap between the upper support foot and the lower weighing platform annular slide can be made uniform, achieving a balanced rotating state.

[0030] The applicant needs to state:

[0031] In the description of the present invention, the terms "upper", "longitudinal", "lower", "outer surface", "outer side", "top" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of simplifying the description of the present invention, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. The terms "first", "second", and "third" in the present invention are only used to describe the difference between components, and cannot be understood as implying importance.

[0032] The substantial features and significant technical advances of the present invention are:

[0033] 1. The present invention can replace the weighing function and can quickly and accurately obtain the unbalanced torque of the upper structure, and then perform the corresponding weight balancing operation. During the weight balancing operation, the changes in the pressure of the sand boxes at different positions can be observed in real time. When the pressure of each sand box is uniform, the upper structure is balanced. At this time, removing the sand box can maintain the balance state of the upper structure, so that all the upper support legs are suspended in the air.

[0034] 2. The force measuring sand box in the present invention can be recycled, which saves manpower, financial and material resources, has high measurement accuracy, and has low requirements on the operating level of operators, which can further shorten the construction period and make it easier to ensure the balance of the swivel structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings of the present invention include:

[0036] Figure 1 The present invention is a schematic structural diagram of the present invention in which a rubber elastic body is encapsulated by using a first annular baffle ring, an upper cylinder top and a cover plate.

[0037] Figure 2 The present invention is a schematic structural diagram of the present invention in which a rubber elastic body is encapsulated by using a third annular baffle ring, a cover plate and the top of an upper cylinder.

[0038] Figure 3 The present invention is a schematic structural diagram of the present invention that uses a third annular baffle ring, a cover plate and a bottom of a lower cylinder to encapsulate a rubber elastic body.

[0039] Figure 4 The present invention is a schematic structural diagram of the present invention that uses a second annular retaining ring, a lower cylinder bottom and a cover plate to encapsulate a rubber elastic body.

[0040] Figure 5 The present invention is a schematic structural diagram of the present invention that uses a first annular baffle ring, an upper cylinder top and a cover plate to encapsulate an alloy steel elastomer.

[0041] Figure 6 The present invention is a schematic structural diagram of the present invention that uses a third annular baffle ring, a cover plate and the top of an upper cylinder to encapsulate an alloy steel elastomer.

[0042] Figure 7 The present invention is a schematic structural diagram of the present invention that uses a third annular baffle ring, a cover plate and a bottom of a lower cylinder to encapsulate an alloy steel elastomer.

[0043] Figure 8 The present invention is a schematic structural diagram of the present invention that uses a second annular retaining ring, a lower cylinder bottom and a cover plate to encapsulate an alloy steel elastomer.

[0044] Fig. 9 It is a schematic diagram of the assembly of the force measuring element when the rubber elastic body is encapsulated by the first annular retaining ring, the top of the upper cylinder and the cover plate.

[0045] Fig.10 It is an assembly diagram of a force measuring element when a third annular retaining ring, a cover plate and a bottom of a lower cylinder are used to encapsulate an alloy steel elastic body.

[0046] Fig.11 It is a schematic diagram of the installation plan of the force measuring sand box for the rotating bridge.

[0047] The reference numerals in the accompanying drawings are as follows:

[0048] 1. Upper cylinder; 1A. Filler; 1B. First annular retaining ring; 1C. Upper hook; 2. Lower cylinder; 2A. Contents; 2B. Lower hook; 2C. Sand outlet pipe; 2D. End cover; 2E. Second annular retaining ring; 3A. Rubber elastic body; 3B. Oil nozzle; 3C. Alloy steel elastic body; 3D. Fiber grating force measurement module; 4. Cover plate; 4A. Third annular retaining ring. DETAILED DESCRIPTION

[0049] The following further describes the embodiments of the present invention in conjunction with the accompanying drawings, but does not limit the present invention. The protection scope of the present invention shall be based on the contents recorded in the claims, and any equivalent technical means replaced according to the description shall not depart from the protection scope of the present invention.

[0050] Example 1

[0051] The overall structure of this embodiment is as follows Figure 1 , 9 As shown, it includes a lower tube 2 with content 2A filled in it and an opening at the top, an upper tube 1 with its bottom placed on the upper surface of the content 2A and longitudinally mounted in the lower tube 2, and a sand outlet pipe 2C for controlling the outflow of the content 2A is opened at the lower side of the lower tube 2; the upper tube 1 is a closed cylindrical structure composed of an upper plate, a side plate, and a bottom plate and filled with a filler 1A, and the side edge of the elastic body is matched with the force measuring element.

[0052] The surface of the sand outlet pipe 2C is equipped with an end cover 2D.

[0053] The filler 1A is micro-expansive concrete, and the content 2A is quartz sand.

[0054] The elastic body is packaged in the following structure:

[0055] A first annular retaining ring 1B is formed on the top of the upper tube 1 outside the periphery of the elastic body, and the first annular retaining ring 1B, the top of the upper tube 1 and the cover plate 4 encapsulate the elastic body;

[0056] The elastic body is a rubber elastic body 3A, and the force measuring element is a hydraulic oil, an oil pump and a hydraulic force gauge connected to the side edge of the rubber elastic body 3A through an oil nozzle 3B. The oil nozzle 3B is arranged in the first annular retaining ring 1B.

[0057] The side walls of the upper tube 1 and the lower tube 2 are equipped with hooks, including an upper hook 1C symmetrically mounted on the side wall of the upper tube 1 and a lower hook 2B symmetrically mounted on the side wall of the lower tube 2.

[0058] Example 2

[0059] The overall structure of this embodiment is as follows Figure 2 As shown, the difference between this embodiment and embodiment 1 is that:

[0060] The elastic body is packaged in the following structure:

[0061] The rubber elastic body 3A is encapsulated by the third annular baffle ring 4A, the cover plate 4 and the top of the upper cylinder 1 .

[0062] The oil nozzle 3B is arranged in the third annular retaining ring 4A.

[0063] The rest of the structure is the same as that of Example 1.

[0064] Example 3

[0065] The overall structure of this embodiment is as follows Figure 3 As shown, the difference between this embodiment and embodiment 1 is that:

[0066] The elastic body is packaged in the following structure:

[0067] The rubber elastic body 3A is encapsulated by the third annular baffle ring 4A, the cover plate 4 and the bottom of the lower cylinder 2 .

[0068] The oil nozzle 3B is arranged in the third annular retaining ring 4A.

[0069] The rest of the structure is the same as that of Example 1.

[0070] Example 4

[0071] The overall structure of this embodiment is as follows Figure 4 As shown, the difference between this embodiment and embodiment 1 is that:

[0072] The elastic body is packaged in the following structure:

[0073] The rubber elastic body 3A is encapsulated by the second annular baffle ring 2E, the bottom of the lower cylinder 2 and the cover plate 4.

[0074] The oil nozzle 3B is arranged in the second annular retaining ring 2E.

[0075] The rest of the structure is the same as that of Example 1.

[0076] Example 5

[0077] The overall structure of this embodiment is as follows Figure 5 , 10 As shown, the difference between this embodiment and embodiment 1 is that:

[0078] The elastic body is an alloy steel elastic body 3C, and the force measuring element is a fiber grating force measuring module 3D matched with the deformation part of the side edge of the alloy steel elastic body 3C.

[0079] The elastic body is packaged in the following structure:

[0080] The alloy steel elastomer is encapsulated by using a first annular baffle ring 1B, the top of the upper tube 1 and a cover plate 4 .

[0081] The fiber Bragg grating force measuring module 3D is arranged in the first annular retaining ring 1B.

[0082] The rest of the structure is the same as that of Example 1.

[0083] Example 6

[0084] The overall structure of this embodiment is as follows Figure 6 , 10 As shown, the difference between this embodiment and embodiment 1 is that:

[0085] The elastic body is an alloy steel elastic body 3C, and the force measuring element is a fiber grating force measuring module 3D matched with the deformation part of the side edge of the alloy steel elastic body 3C.

[0086] The elastic body is packaged in the following structure:

[0087] The third annular baffle ring 4A, the cover plate 4 and the top of the upper cylinder 1 encapsulate the alloy steel elastomer.

[0088] The fiber Bragg grating force measuring module 3D is arranged in the third annular retaining ring 4A.

[0089] The rest of the structure is the same as that of Example 1.

[0090] Example 7

[0091] The overall structure of this embodiment is as follows Figure 7 , 10 As shown, the difference between this embodiment and embodiment 1 is that:

[0092] The elastic body is an alloy steel elastic body 3C, and the force measuring element is a fiber grating force measuring module 3D matched with the deformation part of the side edge of the alloy steel elastic body 3C.

[0093] The elastic body is packaged in the following structure:

[0094] The alloy steel elastomer is encapsulated by using the third annular baffle ring 4A, the cover plate 4 and the bottom of the lower cylinder 2.

[0095] The fiber Bragg grating force measuring module 3D is arranged in the third annular retaining ring 4A.

[0096] The rest of the structure is the same as that of Example 1.

[0097] Example 8

[0098] The overall structure of this embodiment is as follows Figure 8 , 10 As shown, the difference between this embodiment and embodiment 1 is that:

[0099] The elastic body is an alloy steel elastic body 3C, and the force measuring element is a fiber grating force measuring module 3D matched with the deformation part of the side edge of the alloy steel elastic body 3C.

[0100] The elastic body is packaged in the following structure:

[0101] The alloy steel elastomer is encapsulated by using a second annular retaining ring 2E, a bottom of the lower cylinder 2 and a cover plate 4.

[0102] The fiber Bragg grating force measuring module 3D is arranged in the second annular retaining ring 2E.

[0103] The application of the force measuring sand box for a rotating bridge described in Examples 1-8 in the construction of a rotating bridge includes the following process steps:

[0104] Ⅰ. When installing the swivel device, place the force measuring sand box at the designed position between the upper and lower platforms of the swivel structure;

[0105] Ⅱ. After the casting construction of the upper structure is completed, the bracket and formwork of the rotating structure are removed;

[0106] III. Read the pressure value of the force measuring sand box at different positions;

[0107] IV. According to the measured pressure values ​​of the sand boxes at different positions and the distance from the center, calculate the eccentricity of the rotating structure in the longitudinal and transverse directions of the bridge respectively;

[0108] Ⅴ. Balancing weights according to calculation results;

[0109] Ⅵ. Remove the force measuring sand box and carry out rotation operation.

[0110] The rest of the structure is the same as that of Example 1.

[0111] In order to verify the effect of the embodiment of the present invention and detect the accuracy of the data measured by the force measuring sand box, the applicant Figure 1 and Figure 8 One set of force measuring sand boxes were made for each structure shown, and the force measuring data was checked on a 600-ton press. Pressure tests at different loading levels were repeated three times to form the data in Table 1. By comparison, it can be seen that the data measured by the force measuring sand box in the present invention is basically consistent with the actual pressure.

[0112] Table 1 Comparison of test data of force measurement sand box and press in the present invention

[0113]

Claims

1. A dynamometric sand box for a swivel bridge, comprising a lower cylinder (2) containing contents (2A) and having an opening at the top, an upper cylinder (1) with a bottom placed on the upper surface of the contents (2A) and longitudinally sleeved in the lower cylinder (2), and an outlet for controlling the outflow of the contents (2A) is opened at the lower side of the lower cylinder (2); characterized in that The upper cylinder (1) is a closed cylindrical structure composed of an upper plate, a side plate, and a bottom plate and filled with a filler (1A). The filler (1A) is made of micro-expansive concrete. The elastic body is encapsulated on the outer surface of the upper plate of the upper cylinder (1) or the outer surface of the bottom of the lower cylinder (2) by a cover plate (4). The side edge of the elastic body is connected to the force measuring element. The elastic body is encapsulated by the following structure: A. The top edge of the upper tube (1) or the bottom edge of the lower tube (2) outside the periphery of the elastic body forms a first annular retaining ring (1B) or a second annular retaining ring (2E) correspondingly. The first annular retaining ring (1B), the top edge of the upper tube or the second annular retaining ring (2E), the bottom edge of the lower tube and the cover plate (4) encapsulate the elastic body; B. The cover plate (4) outside the periphery of the elastic body forms a third annular retaining ring (4A), and the third annular retaining ring (4A), the cover plate (4) and the top of the upper tube (1) or the bottom of the lower tube (2) outside the periphery of the elastic body encapsulate the elastic body; The elastic body is selected from one of a rubber elastic body (3A) or an alloy steel elastic body (3C); the force measuring element is selected from hydraulic oil, an oil pump and a hydraulic force gauge connected to the side edge of the rubber elastic body (3A) through an oil nozzle (3B), or a fiber grating force measuring module (3D) matched with the deformation part of the side edge of the alloy steel elastic body (3C).

2. The force measuring sand box for a swivel bridge according to claim 1, characterized in that The outlet is a sand outlet pipe (2C) or a warehouse door.

3. The dynamometer sand box for a swivel bridge according to claim 2, characterized in that The surface of the sand outlet pipe (2C) is equipped with an end cover (2D).

4. The dynamometer sand box for a swivel bridge according to claim 1, characterized in that The oil nozzle (3B) or the fiber optic grating force measurement module (3D) is arranged in the first annular retaining ring (1B), the second annular retaining ring (2E) or the third annular retaining ring (4A).

5. The dynamometer sand box for a swivel bridge according to claim 1, characterized in that The side walls of the upper cylinder (1) and the lower cylinder (2) are equipped with hooks.

6. The force measuring sand box for a swivel bridge according to claim 1, characterized in that The hook comprises an upper hook (1C) symmetrically assembled on the side wall of the upper tube (1) and a lower hook (2B) symmetrically assembled on the side wall of the lower tube (2).

7. The use of a force measuring sand box for a rotating bridge according to any one of claims 1 to 6 in the construction of a rotating bridge, characterized in that The process steps include: Ⅰ. When installing the swivel device, place the force measuring sand box at the designed position between the upper and lower platforms of the swivel structure; Ⅱ. After the casting construction of the upper structure is completed, the bracket and formwork of the rotating structure are removed; III. Read the pressure value of the force measuring sand box at different positions; IV. According to the measured pressure values ​​of the sand boxes at different positions and the distance from the center, calculate the eccentricity of the rotating structure in the longitudinal and transverse directions of the bridge respectively; Ⅴ. Balancing weights according to calculation results; Ⅵ. Remove the force measuring sand box and carry out rotation operation.

Images