A separate jacking construction method

Abstract

The present invention discloses a split-type jacking construction method, comprising the following steps: S1, linear research, S2, determination of a separation position, S3, construction preparation, S4, assembly and jacking, S5, jacking into place and removal of guide beams, S6, splicing of connected steel box beams, and S7, overall beam drop. The present invention effectively avoids excessive lateral deviation, eliminates the risk of overturning, has high stability and safety, a short lateral correction distance, a small number of corrections, greatly saves construction time, has extremely high construction efficiency, and has high use value and social benefits.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and in particular to a separate jacking construction method. Background Art

[0002] With the construction and development of expressways in my country, bridge engineering technology has also been promoted and developed, but it has also put forward higher requirements and standards for bridge engineering technology.

[0003] In mountainous, canyon, and hilly areas, walking-type jacking and other methods are often used to erect steel box girders. However, when the walking-type jacking construction method encounters a "curve + straight line" "plane line shape" of the entire bridge, a series of construction difficulties will arise. The steel box girders of the straight section and the curved section are connected together and pushed continuously at one time, which requires lateral correction. The correction range is large and the number of corrections is extremely high, resulting in low construction efficiency and a very long construction period. At the same time, the first section or certain parts of the steel box girder are prone to extend beyond the temporary support and out of the support range of the bridge pier, resulting in a cantilever situation, which destroys the overall stability of the steel box girder and has extremely poor safety. Figure 9 .

[0004] In order to solve the above problems, the present invention provides a separate jacking construction method. Summary of the Invention

[0005] The present invention provides a separate type jacking construction method

[0006] The scheme of the present invention is:

[0007] A separate jacking construction method comprises the following steps:

[0008] S1. Alignment Study: First, analyze the original design alignment to determine the curve radius and route length. Software is used to simulate the alignment of the entire steel box girder when it is pushed onto different piers. The actual push position is compared with the original design alignment, and the lateral offset distance is measured. The overall stability of the steel box girder is determined based on engineering experience and the size of the lateral offset distance.

[0009] S2. Determine the separation position: determine the separation position of the entire bridge steel box girder based on the position of the bridge piers and the connection between the curved and straight sections, that is, divide the entire bridge steel box girder into two parts at the separation position;

[0010] S3, construction preparation: set up assembly frames and assembly platforms at both ends of the bridge, and make guide beams. Then install jacking equipment and install temporary supports on the piers;

[0011] S4: Assembling and pushing: Assemble the guide beams and steel box beams at each end of the bridge. After assembly, push each beam and simultaneously assemble the steel box beams. Measure the alignment and perform lateral deviation correction.

[0012] S5. Push into place and remove the guide beam. First, ensure that one of the joints reaches the predetermined joint first. Then, perform linear inspection and adjustment on the joint that arrives first to ensure that it is on the designed line. Secondly, remove the guide beam of the joint.

[0013] Then, when the top of the guide beam of the other unit reaches the predetermined splicing position, the guide beam of the unit is removed; finally, the other unit of steel box beam is pushed up to the predetermined splicing position;

[0014] S6. Splice the steel box girders of each unit and adjust the linear position of the two units to ensure that the entire unit meets the linear design requirements after being seated. Then connect the joints of the two units to complete the splicing of the two steel box girders.

[0015] S7. After the two sections are joined, the overall steel box girder is placed synchronously so that the entire steel box girder falls on the pier supports.

[0016] As a preferred technical solution, in step S1, it is judged in combination with engineering experience and the size of the lateral offset distance that when the curve radius is too small and the bending curvature is too small, the lateral offset distance of the steel box girder will be too large during jacking, and the stability of the girder body will be poor and the safety will be low. In this case, the one-time continuous jacking scheme for the entire bridge is abandoned and a separate jacking construction method is adopted.

[0017] As a preferred technical solution, the two parts divided into the first part and the second part in step S2 are:

[0018] As a preferred technical solution, the principle of separation of positions in step S2 is:

[0019] 1) It is convenient for splicing the two parts of steel box girders and is located just above one of the piers;

[0020] 2) Avoid bending lines in the part containing straight lines after separation;

[0021] 3) The separation location is the joint of the two steel box girders.

[0022] As a preferred technical solution, in step S6, the joints of the two sections are welded to achieve the splicing of the two sections of steel box girders.

[0023] As a preferred technical solution, the software drawing is CAD drawing.

[0024] Due to the adoption of the above technical solution, a separate jacking construction method includes the following steps:

[0025] S1. Alignment Study: First, analyze the original design alignment to determine the curve radius and route length. Software is used to simulate the alignment of the entire steel box girder when it is pushed onto different piers. The actual push position is compared with the original design alignment, and the lateral offset distance is measured. The overall stability of the steel box girder is determined based on engineering experience and the size of the lateral offset distance.

[0026] S2. Determine the separation position: determine the separation position of the entire bridge steel box girder based on the position of the bridge piers and the connection between the curved and straight sections, that is, divide the entire bridge steel box girder into two parts at the separation position;

[0027] S3, construction preparation: set up assembly frames and assembly platforms at both ends of the bridge, and make guide beams. Then install jacking equipment and install temporary supports on the piers;

[0028] S4: Assembling and pushing: Assemble the guide beams and steel box beams at each end of the bridge. After assembly, push each beam and simultaneously assemble the steel box beams. Measure the alignment and perform lateral deviation correction.

[0029] S5. Push into place and remove the guide beam. First, ensure that one of the joints reaches the predetermined joint first. Then, perform linear inspection and adjustment on the joint that arrives first to ensure that it is on the designed line. Secondly, remove the guide beam of the joint.

[0030] Then, when the top of the guide beam of the other unit reaches the predetermined splicing position, the guide beam of the unit is removed; finally, the other unit of steel box beam is pushed up to the predetermined splicing position;

[0031] S6. Splice the steel box girders of each unit and adjust the linear position of the two units to ensure that the entire unit meets the linear design requirements after being seated. Then connect the joints of the two units to complete the splicing of the two steel box girders.

[0032] S7. After the two sections are joined, the overall steel box girder is placed synchronously so that the entire steel box girder falls on the pier supports.

[0033] Advantages of the present invention:

[0034] This method is applicable to the jacking and erection of steel box girders with a "curve + straight line" bridge shape, that is, a curved part + a straight part. It mainly separates the entire steel box girder into two parts, then jacks them from both ends of the bridge, and finally splices them together to solve the problems of large lateral offset, high overturning risk, many lateral correction times, low construction efficiency, and long construction period in the one-time continuous jacking of the entire bridge in the "curve + straight line" line shape. This method effectively avoids excessive lateral deviation, has no overturning risk, has high stability and safety, a small lateral correction distance, a small number of correction times, greatly saves construction time, has extremely high construction efficiency, and has high use value and social benefits.

[0035] The present invention has the advantages of small lateral deviation, no risk of the steel box girder being separated from the temporary support, high stability and high construction safety.

[0036] The invention pushes at both ends simultaneously, the lateral deviation correction distance is small, the number of corrections is small, the construction period is greatly saved, and the construction efficiency is extremely high. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the construction method of the present invention, in which A is a three-dimensional diagram; B is a plan view of the design route;

[0038] Figure 2 This is a schematic diagram of step 1 in an example of the present invention;

[0039] Figure 3 This is a schematic diagram of step 2 in an example of the present invention, where A is a three-dimensional diagram; B is a plan view of the design route;

[0040] Figure 4 Schematic diagram of step 3 in an example of the present invention, in which A is a three-dimensional diagram; B is a plan view of the design route;

[0041] Figure 5 Schematic diagram of step 4 in an example of the present invention, in which A is a three-dimensional diagram; B is a plan view of the design route;

[0042] Figure 6 Schematic diagram of step 5 in an example of the present invention, in which A is a three-dimensional diagram; B is a plan view of the design route;

[0043] Figure 7 Schematic diagram of step 6 in an example of the present invention, in which A is a three-dimensional diagram; B is a plan view of the design route;

[0044] Figure 8 Schematic diagram of step 7 in an example of the present invention, in which A is a three-dimensional diagram; B is a plan view of the design route;

[0045] Figure 9 It is a schematic diagram of the walking-type jacking construction method in the prior art.

[0046] 1- Designed route; 10- Straight section; 20- Curved section; 100- Pushing direction of the first joint; 200- Pushing direction of the second joint; 300- First joint; 400- Second joint; 2- Valley ground line; 3- Bridge pier; 4- Temporary support; 5- Guide beam; 6- Steel box girder splicing section; 7- Steel box girder pushing section; 8- Radius R of circular curve; 9- Lateral offset distance D1; 11- Lateral offset distance D2; 12- Separation position; 13- Pushing equipment; 14- Steel box girder assembly platform; 15- Steel box girder assembly; 16- Extended part; 17- Steel box girder assembly section; 18- Pushing section. DETAILED DESCRIPTION

[0047] In order to make up for the above shortcomings, the present invention provides a separate jacking construction method to solve the problems in the above background technology.

[0048] A separate jacking construction method comprises the following steps:

[0049] S1. Alignment Study: First, analyze the original design alignment to determine the curve radius and route length. Software is used to simulate the alignment of the entire steel box girder when it is pushed onto different piers. The actual push position is compared with the original design alignment, and the lateral offset distance is measured. The overall stability of the steel box girder is determined based on engineering experience and the size of the lateral offset distance.

[0050] S2. Determine the separation position: determine the separation position of the entire bridge steel box girder based on the position of the bridge piers and the connection between the curved and straight sections, that is, divide the entire bridge steel box girder into two parts at the separation position;

[0051] S3, construction preparation: set up assembly frames and assembly platforms at both ends of the bridge, and make guide beams. Then install jacking equipment and install temporary supports on the piers;

[0052] S4: Assembling and pushing: Assemble the guide beams and steel box beams at each end of the bridge. After assembly, push each beam and simultaneously assemble the steel box beams. Measure the alignment and perform lateral deviation correction.

[0053] S5. Push into place and remove the guide beam. First, ensure that one of the joints reaches the predetermined joint first. Then, perform linear inspection and adjustment on the joint that arrives first to ensure that it is on the designed line. Secondly, remove the guide beam of the joint.

[0054] Then, when the top of the guide beam of the other unit reaches the predetermined splicing position, the guide beam of the unit is removed; finally, the other unit of steel box beam is pushed up to the predetermined splicing position;

[0055] S6. Splice the steel box girders of each unit and adjust the linear position of the two units to ensure that the entire unit meets the linear design requirements after being seated. Then connect the joints of the two units to complete the splicing of the two steel box girders.

[0056] S7. After the two sections are joined, the overall steel box girder is placed synchronously so that the entire steel box girder falls on the pier supports.

[0057] In step S1, it is determined based on engineering experience and the size of the lateral offset distance that when the curve radius is too small and the bending curvature is too small, the lateral offset distance of the steel box girder will be too large during jacking, and the stability of the girder body and the safety will be low. In this case, the one-time continuous jacking scheme for the entire bridge is abandoned and a separate jacking construction method is adopted.

[0058] The two parts divided into the first part and the second part in step S2 are:

[0059] The principle of separating the positions in step S2 is:

[0060] 1) It is convenient for splicing the two parts of steel box girders and is located just above one of the piers;

[0061] 2) Avoid bending lines in the part containing straight lines after separation;

[0062] 3) The separation location is the joint of the two steel box girders.

[0063] As a preferred technical solution, in step S6, the joints of the two sections are welded to achieve the splicing of the two sections of steel box girders.

[0064] The software drawing is CAD drawing.

[0065] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0066] Example 1

[0067] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 The specific steps are as follows:

[0068] 1- Designed route; 10- Straight section; 20- Curved section; 100- Pushing direction of the first joint; 200- Pushing direction of the second joint; 300- First joint; 400- Second joint; 2- Valley ground line; 3- Bridge pier; 4- Temporary support; 5- Guide beam; 6- Steel box girder splicing section; 7- Steel box girder pushing section; 8- Radius R of circular curve; 9- Lateral offset distance D1; 11- Lateral offset distance D2; 12- Separation position; 13- Pushing equipment; 14- Steel box girder assembly platform; 15- Steel box girder assembly; 16- Extended part; 17- Steel box girder assembly section; 18- Pushing section.

[0069] S1 Alignment Study. First, the bridge's design route 1 was analyzed to determine the circular curve radius R8 and route length. CAD was then used to simulate the alignment of the entire steel box girder when it was jacked onto different piers 3. The actual jacking position was compared with the design route 1, and the lateral offset distances D19 and D211 were measured. The bridge's stability was analyzed based on the lateral offset distances. Due to the excessive lateral offset distances, portions of the steel box girder were detached from the temporary supports 4, leaving them suspended without support. This poses a high risk of overturning and a high risk of collapse. Therefore, the plan for a single, continuous jacking of the entire bridge was abandoned, and a separate jacking construction method was adopted.

[0070] Determination of S2 separation position 12. Based on the position of pier 3 and the connection between the "curve" and the "straight line", the "curve" is the curved part 20 and the "straight line" is the straight line part; determine the separation position 12 of the steel box girder of the entire bridge, that is, divide the steel box girder of the entire bridge into two parts at the separation position 12, and the two separated parts are named the first unit 300 and the second unit 400. Separation principles: ① To facilitate the splicing of the two parts of the steel box girder, it is generally set directly above a certain pier 3; ② After separation, the part containing the "straight line" should not have an excessively long bending line. The separation position 12 is also the splicing point of the two steel box girders. Finally, the separation position 12 is determined on the third hole pier 3 (the third hole from left to right).

[0071] S3 Construction Preparation: Set up assembly frames and assembly platforms at both ends of the bridge, and make guide beams 5. Then install jacking equipment 13 and install temporary supports 4 on piers 3.

[0072] S4 Assembly and jacking. The guide beams 5 and steel box girders are assembled for the first and second sections 300 and 400 at each end of the bridge. After assembly, each section is jacked and the subsequent steel box girder assembly 15 is carried out simultaneously. The alignment is measured and lateral deviations corrected.

[0073] S5 is pushed into position and the guide beam 5 is removed. First, ensure that the second section 400 reaches the predetermined joint first. Then, the alignment of the second section 400 that arrives first is checked and adjusted to ensure that it is on the designed line 1. Next, the guide beam 5 of the second section is removed. Then, when the top of the guide beam 5 of the first section 300 reaches the predetermined joint, the guide beam 5 of the first section 300 is removed. Finally, the first section 300 steel box beam is pushed again to the predetermined joint.

[0074] S6: Splice the first and second steel box girders. Adjust the linear position of the two girders to ensure that the entire structure meets the linear design requirements after seating. Then weld the joints of the two girders to complete the splicing of the two steel box girders.

[0075] S7 integral beam drop. After the two sections are spliced, the integral steel box beam is placed synchronously so that the entire steel box beam falls on the pier 3 support.

[0076] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A separate jacking construction method, characterized in that: The following steps are involved: S1. Linearity study: First, analyze the original design line to determine the curve radius and route length; The software simulates the linear position of the entire steel box girder when it is pushed onto different piers. The actual position of the push is compared with the original design line, and the lateral offset distance is measured. The overall stability of the steel box girder is determined based on engineering experience and the size of the lateral offset distance. S2. Determine the separation position: determine the separation position of the entire bridge steel box girder based on the position of the bridge piers and the connection between the curved and straight sections, that is, divide the entire bridge steel box girder into two parts at the separation position; S3, construction preparation: set up assembly frames and assembly platforms at both ends of the bridge, and make guide beams. Then install jacking equipment and install temporary supports on the piers; S4: Assembling and pushing: Assemble the guide beams and steel box beams at each end of the bridge. After assembly, push each beam and simultaneously assemble the steel box beams. Measure the alignment and perform lateral deviation correction. S5. Push into place and remove the guide beam. First, ensure that one of the joints reaches the predetermined joint first. Then, perform linear inspection and adjustment on the joint that arrives first to ensure that it is on the designed line. Secondly, remove the guide beam of the joint. Then, when the top of the guide beam of the other unit reaches the predetermined splicing position, the guide beam of the unit is removed; finally, the other unit of steel box beam is pushed up to the predetermined splicing position; S6. Splice the steel box girders of each unit and adjust the linear position of the two units to ensure that the entire unit meets the linear design requirements after seating. Then connect the joints of the two units to complete the splicing of the two steel box girders. S7, overall beam drop: after the two sections are joined, the overall steel box beam is dropped synchronously so that the entire steel box beam falls on the pier support. The two parts divided into the first and second parts in step S2 are separated; the principle of separation position in step S2 is: To facilitate the splicing of the two steel box girders, it is located just above one of the piers; Avoid bending lines in the parts containing straight lines after separation; The separation position is the joint of two steel box girders; The software drawing is CAD drawing.

2. A separate jacking construction method according to claim 1, characterized in that: In step S1, it is determined based on engineering experience and the size of the lateral offset distance that when the curve radius is too small and the bending curvature is too small, the lateral offset distance of the steel box girder will be too large during jacking, and the stability of the girder body and the safety will be low. In this case, the one-time continuous jacking scheme for the entire bridge is abandoned and a separate jacking construction method is adopted.

3. A separate jacking construction method according to claim 1, characterized in that: In step S6, the joints of the two sections are welded to achieve the splicing of the two sections of steel box girders.

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