Cable-stayed bridge wide-width composite beam installation line shape adjusting method

Abstract

The application discloses a cable-stayed bridge wide-width combined beam installation line shape adjusting method, which comprises the following steps: applying an upward force on both ends of a beam section to be installed, and applying a downward force on the middle part of the beam section to be installed, so as to adjust the line shape of the beam section to be installed to be consistent with the line shape of the installed beam section, and realize the corresponding connection and installation between the beam section to be installed and the installed beam section. The application can effectively solve the problem of the difficulty in matching the beam section to be installed with the installed beam section, realizes the accurate matching and installation between the beam sections by the line shape adjusting method, and greatly improves the construction quality and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of wide composite box girder construction. More specifically, the present invention relates to a method for adjusting the installation line shape of a wide composite box girder of a cable-stayed bridge, which is applicable to the installation of a wide composite box girder of a cable-stayed bridge in any construction environment. Background Art

[0002] The wide composite box girder of a cable-stayed bridge is a new type of bridge composite structure. It is usually composed of two half-open side boxes with steel structure and concrete bridge deck to form an integral segmental box girder. It is an improvement on the traditional concrete bridge. Compared with the ordinary concrete web box girder, it properly combines steel and concrete. The concrete top and bottom plates are resistant to bending, and the steel webs are resistant to shear, giving full play to the efficiency of the use of both steel and concrete. Common wide composite box girder A m Recorded as installed beam segment Figure 1 As shown, the half-open side box of the beam is welded by the middle web 1, the side web 2, and the bottom plate 3. The two half-open side boxes are connected by a cross-part 4. The web and top plate include the vertical first matching piece 5 and the horizontal second matching piece 6, and the bridge deck 7. Beam section A to be installed m+1 Beam segment and installed beam segment A m Beam segments are adjacent and have the same structure as Figure 2 As shown, the three-dimensional position diagrams of the two beam segments are as follows Figure 3 As shown, beam section A to be installed m+1 The beam section includes the center web 1', side web 2', bottom plate 3', transverse diaphragm 4', first matching piece 5', second matching piece 6' and bridge deck 7'. During the on-site construction process, the construction sequence is usually to weld the center web-side web-bottom plate-transverse diaphragm, then install the bridge deck, and then cast the installed beam section A. m Bridge deck 7 and beam segment A to be installed m+1 Wet joints between deck plates 7', so that A m+1 Beam section and A m The beam section forms a whole, completing the installation of the beam section.

[0003] Bridge crane installation is one of the commonly used hoisting construction methods for this structure. In this method, the beam section to be installed is lifted to the predetermined elevation by the bridge crane and connected to the installed beam section. However, during the construction process, the composite beam is subjected to the action of the bridge crane's fulcrum force and its own weight. Due to its relatively small lateral stiffness, it often experiences vertical deformation of the cross section. The deformation of the bridge deck is Δ1, the deformation of the middle web bottom plate is Δ2, and the deformation of the intersection of the inclined bottom plate and the flat bottom plate is Δ3. Figure 4 As shown, this makes it difficult to match the beam section to be hoisted with the installed beam section.

[0004] To solve the problem of difficulty in matching and connecting the beam sections to be hoisted with the installed beam sections, the existing method is to install a top-pressing device at the bottom of the beam, apply external force locally to the difficult-to-match parts to restore them to their original position before matching. The above method is relatively complicated in actual operation, and under the action of large external forces, the box beam will have problems such as stress concentration, local residual stress, and excessive local deformation, which will have a great impact on construction time and cost. Summary of the Invention

[0005] One purpose of the present invention is to provide a linear adjustment method for the installation of wide-width composite beams of a cable-stayed bridge, which can effectively solve the difficult problem of matching the beam sections to be installed with the installed beam sections. Through the linear adjustment method, accurate matching and installation between the beam sections can be achieved, greatly improving the construction quality and efficiency.

[0006] In order to achieve these objects and other advantages according to the present invention, a method for adjusting the installation line shape of a wide-span composite beam of a cable-stayed bridge is provided, which includes applying an upward force to both ends of the beam section to be installed and applying a downward force in the middle of the beam section to be installed, thereby adjusting the line shape of the beam section to be installed to be consistent with the installed beam section, thereby achieving corresponding connection installation between the beam section to be installed and the installed beam section.

[0007] Preferably, an upward force is applied to both ends of the beam section to be installed by a sling, and a downward force is applied to the middle portion of the beam section to be installed by a jack.

[0008] Preferably, a track is provided on the beam section to be installed, on which an auxiliary bracket is provided for sliding cooperation, and the jack is installed on the top of the auxiliary bracket. The auxiliary bracket is a square frame structure and a pulley is provided at the bottom, which slides on the track.

[0009] Preferably, the webs of the beam section to be installed and the installed beam section correspond to each other in position, the bottom plates correspond to each other in position, and the matching parts correspond to each other in position.

[0010] Preferably, the specific adjustment includes the following steps:

[0011] Step 1: One of the beam sections A of the wide composite beam m Connect the lifting rope to the preset hook on the beam segment and lift the beam segment A m Hoisted to the set position as installed beam segment A m , the corresponding inclined sling T m Tensioning to the predetermined cable force;

[0012] Step 2: Connect the lifting cable to the beam section A to be installed m+1 Connect the preset hook on the beam segment A to be installed m+1 Lift to the set position and install the installed beam section A in turn m With the beam segment A to be installed m+1Temporarily connecting the middle web, side web, bottom plate, first matching piece and second matching piece;

[0013] Step 3: Fit the auxiliary bracket to the track through the pulley and slide it along the track to the beam section A to be installed m+1 The set position of the beam segment A is to be installed by slings m+1 Apply upward forces T1 and T2 at both ends of the beam to install beam section A through the jack m+1 A downward force F is applied to the middle of the beam section A to be installed. m+1 Vertical deformation in transverse direction of bridge and installed beam segment A m Linear fitting of vertical deformation in the transverse direction of the bridge;

[0014] Step 4: Install beam section A in sequence m+1 and installed beam segment A m The middle web, side web, bottom plate, first matching piece and second matching piece are welded together;

[0015] Step 5: After welding is completed, remove the lifting rope and the preset hook, and use the inclined lifting rope to tension the rope to the predetermined tension for the first time;

[0016] Step 6: Install beam section A m+1 and installed beam segment A m The bridge deck is installed and tensioned for the second time to the predetermined cable force through the inclined slings;

[0017] Step 7: Cast the wet joints between the bridge decks to complete the construction of the entire beam section, and move the auxiliary support to the next beam section to be installed via the track, and repeat the above steps for construction.

[0018] Preferably, the downward force F applied by the jack is 20% to 30% of the weight G of the beam section.

[0019] Preferably, beam section A has been installed in step 1 m After the hoisting is completed, mark the four coordinate points C1, C2, C3, and C4 corresponding to the middle of the top and bottom webs. In step 3, the beam section A to be installed m+1 After the lifting is completed and the jack is installed in place, measure the corresponding coordinate points C1 (x1, y1), C2 (x2, y2), C3 (x3, y3), and C4 (x4, y4) in step 1, and treat the lifting beam section A as m+1 After applying corresponding forces at both ends and the middle, the beam section A to be installed is measured. m+1 The spatial position of the beam segment A to be installed at this time is recorded, and the corresponding coordinate points C'1 (x'1, y'1), C'2 (x'2, y'2), C'3 (x'3, y'3), and C'4 (x'4, y'4) in the middle of the top and bottom webs are recorded. m+1The vertical deformation curve of the transverse bridge direction and the installed beam segment A m The vertical deformation curve of the transverse bridge is fitted, and the line passing through the four points is defined as a set of multi-segment curves. These three curves can be expressed by the following formula:

[0020] N1(x)=a1(x-x1)+b1(x-x2) 2 +c1(x-x3) 3 +d1 is located on the interval [x1,x2];

[0021] N2(x)=a2(x-x1)+b2(x-x2) 2 +c2(x-x3) 3 +d2 is located on the interval [x2,x3];

[0022] N3(x)=a3(x-x1)+b3(x-x2) 2 +c3(x-x3) 3 +d3 is located on the interval [x3,x4];

[0023] In addition, the three curves must also meet the following three constraints:

[0024] N j (x j )=y j ,N j (x j+1 )=y j+1 , where j = 1, 2, 3, 4; ensure that the data points inserted into the curve N(x) meet the requirements;

[0025] N' j-1 (x j )=N' j (x j ), where j = 2, 3, or 4; so that the slopes of adjacent curve segments remain consistent where they intersect;

[0026] N” j-1 (x j )=N” j (x j ), where j = 2, 3, or 4; ensuring that the curvature of the two adjacent curve segments is the same.

[0027] Preferably, the beam section A to be installed m+1 The vertical deformation curve of the transverse bridge direction and the installed beam segment A m The vertical deformation curve fitting in the transverse direction of the bridge meets the requirement of Min(Δ1+Δ2+Δ3+Δ4)<=1×10^(-5), where Δ1=(x1-x'1) 2 +(y1-y'1) 2 ; Δ2=(x2-x'2)2 +(y2-y'2) 2 ; Δ3=(x3-x'3) 2 +(y3-y'3) 2 ;

[0028] Δ4=(x4-x'4) 2 +(y4-y'4) 2 .

[0029] Preferably, the method for estimating the downward force F applied by the jack is as follows: the cross section of the beam is simulated as a continuous beam, the length of the continuous beam is l, and according to the curve function formula of the continuous beam: Deflection When the transverse deflection of the beam section to be installed is closer to that of the installed beam section, the beam section A m and beam section A m+1 The smaller the lateral displacement difference is, when Min(Δ1+Δ2+Δ3+Δ4)<=1×10^(-5) is satisfied, the jack force F can be obtained.

[0030] The present invention has at least the following beneficial effects:

[0031] In the existing construction method of wide-width composite box girders, a top-pressing device is directly installed at the bottom of the beam, and a large external force is locally applied to the difficult-to-match parts to restore them to their original position before matching. This can easily cause problems such as local stress concentration and excessive deformation. The beneficial effect of the present invention is that, through auxiliary brackets and jacks, only a small force needs to be applied to achieve linear fitting of the beam section to be hoisted and the installed beam section, thereby achieving the purpose of rapid and accurate matching of wide-width composite beams, and greatly improving the construction efficiency of wide-width composite beams of cable-stayed bridges.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] (1) The present invention solves the problems of stress concentration and excessive local deformation caused by traditional processes. Only a small force is required to achieve linear fitting between the beam section to be hoisted and the installed beam section, completing the beam section matching and greatly improving the installation accuracy and efficiency of the wide composite beams of the cable-stayed bridge.

[0034] (2) The auxiliary bracket and jack used in the present invention can be moved to the beam section to be hoisted via a track, and have the advantages of continuous operation, further improving the efficiency of beam section installation.

[0035] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Beam section A has been installed for the present inventionm Schematic diagram of the structure;

[0037] Figure 2 Beam section A to be installed in the present invention m+1 Schematic diagram of the structure;

[0038] Figure 3 A schematic diagram of the three-dimensional positions of the installed beam section and the beam section to be installed according to the present invention;

[0039] Figure 4 Schematic diagram of deformation of the installed beam section and the beam section to be installed during installation;

[0040] Figure 5 is a flow chart of the adjustment method of the present invention;

[0041] Figure 6 Schematic diagram of the process structure of the adjustment method of the present invention;

[0042] Figure 7 This is a detailed structural diagram of the auxiliary bracket of the present invention;

[0043] Figure 8 This is a cross-sectional view of the auxiliary bracket of the present invention;

[0044] Figure 9 Beam section A has been installed for the present invention m Vertical deformation curve in the transverse direction of the bridge;

[0045] Figure 10 Beam section A to be installed in the present invention m+1 Vertical deformation curve in the transverse direction of the bridge.

[0046] Description of reference numerals:

[0047] 1. Middle web, 2. Side web, 3. Bottom plate, 4. Diaphragm, 5. First matching piece, 6. Second matching piece, 7. Bridge deck, 8. Inclined sling, 9. Installed beam segment A m , 10. Beam section A to be installed m+1 , 11. Lifting rope, 12. Preset hook, 13. Auxiliary bracket, 14. Track, 15. Jack, 16. Pulley. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0049] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0050] The present invention provides a method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge, comprising applying an upward force to both ends of a beam section to be installed and a downward force to the middle of the beam section to be installed, thereby adjusting the line shape of the beam section to be installed to be consistent with the installed beam section, thereby achieving corresponding connection installation between the beam section to be installed and the installed beam section.

[0051] In the above technical solution, by applying forces in opposite directions at both ends and in the middle of the beam segment, only a small force is required to achieve linear fitting of the beam segment to be installed and the installed beam segment, completing the beam segment matching and greatly improving the installation accuracy and efficiency of the wide-span composite beam of the cable-stayed bridge.

[0052] In another technical solution, an upward force is applied to both ends of the beam section to be installed by a sling, and a downward force is applied to the middle portion of the beam section to be installed by a jack 15 .

[0053] In another technical solution, Figure 7 and Figure 8 As shown, a track 14 is provided on the beam section to be installed, on which an auxiliary bracket 13 is slidingly provided, and a jack 15 is installed on the top of the auxiliary bracket 13. The auxiliary bracket 13 is a square frame structure and a pulley 16 is provided at the bottom, which slides on the track 14.

[0054] In the above technical solution, the auxiliary bracket 13 and jack 15 are provided, and the track 14 is provided to enable the auxiliary bracket 13 to be moved and fixed on the beam segment. The track 14 can be used to move the jack 15 to the beam segment to be installed, providing advantages such as continuous operation and further improving the efficiency of beam segment installation. The auxiliary bracket 13 is used to mount the jack 15. The pulley 16 provided at the bottom of the auxiliary bracket 13 is only one method of sliding arrangement. Other existing structures that can achieve sliding on the track 14 are also acceptable. Sliding saddles are provided at both ends of the top of the auxiliary bracket 13, with the jack 15 located in the middle of the saddles.

[0055] In another technical solution, Figure 5 and Figure 6 As shown, the specific adjustment includes the following steps:

[0056] Step 1: Use a bridge crane to lift one of the beam sections A of the wide composite beam m Connect the lifting rope 11 with the preset hook 12 on the beam section and lift the beam section A m Hoisted to the set position as installed beam segment A m 9. Corresponding oblique sling 8T m Tension is applied to the predetermined cable force, and the corresponding coordinate points C1, C2, C3, and C4 in the middle of the top and bottom webs are marked. It should be noted that A is the number of the beam segment, m is a positive integer, and A m The beam segment represents the mth beam segment A, A m+1 The beam section is the next A beam section, T m The inclined cable represents the mth inclined cable 8, T m+1 The beam section is the next oblique sling 8.

[0057] Step 2: Connect the lifting rope 11 to the beam section A to be installed m+1 10 and connect the preset hook 12, and the entire beam segment A to be installed m+1 Lift to the set position, the webs of the beam to be installed should correspond to the webs of the installed beam, the bottom plates should correspond to the bottom plates, and the matching parts should correspond to the matching parts. m With the beam segment A to be installed m+1 The middle web, side web, bottom plate, first matching piece and second matching piece are temporarily connected; beam segment A has been installed m It includes the middle web 1, the side web 2, the bottom plate 3, the first matching piece 5, the second matching piece 6, and the beam section A to be hoisted m+1 Including the middle web 1', side web 2', bottom plate 3', first matching piece 5', second matching piece 6', beam section A has been installed m The middle web 1, side web 2 and the beam section A to be hoisted m+1 The positions of the middle web 1' and the side web 2' correspond to each other, the positions of the bottom plate 3 and the bottom plate 3' correspond to each other, the positions of the first matching piece 5 and the first matching piece 5' correspond to each other, and the positions of the second matching piece 6 and the second matching piece 6' correspond to each other; then the corresponding parts are temporarily connected respectively.

[0058] Step 3: Install beam section A to be hoisted m+1 The track 14 of the top plate, the auxiliary bracket 13 and the jack 15 on it are matched to the track 14 through the pulley 16 and slide along the track 14 to the beam section A to be installed m+1 The setting position of beam section A has been installed according to on-site measurement. mRecord the spatial position of the four coordinate points C1 (x1, y1), C2 (x2, y2), C3 (x3, y3), and C4 (x4, y4) corresponding to step 1, of which beam segment A has been installed. m The simplified diagram of vertical deformation in the transverse direction of the bridge is as follows: Figure 9 As shown, the deformation curve is similar to a quadratic parabola; the beam section A to be installed m+1 The simplified diagram of the vertical deformation of the transverse bridge when it is being hoisted is as follows: Figure 10 As shown, beam segment A is installed by slings m+1 Upward forces T1 and T2 are applied at both ends of the beam section A to be installed by jack 15. m+1 The downward force F is applied to the middle of the beam section A to be installed. m+1 The spatial position of the bridge is recorded, and the corresponding coordinate points C'1 (x'1, y'1), C'2 (x'2, y'2), C'3 (x'3, y'3), and C'4 (x'4, y'4) in the middle of the top and bottom webs are recorded. In order to compare the vertical deformation curve of the bridge in the transverse direction with the A m The vertical deformation curve fitting of the beam segment in the transverse direction of the bridge is as follows: Figure 10 As shown, the line passing through the four points is defined as a set of multi-segment curves. These three curves can be expressed by the following formula:

[0059] N1(x)=a1(x-x1)+b1(x-x2) 2 +c1(x-x3) 3 +d1 is located on the interval [x1,x2];

[0060] N2(x)=a2(x-x1)+b2(x-x2) 2 +c2(x-x3) 3 +d2 is located on the interval [x2,x3];

[0061] N3(x)=a3(x-x1)+b3(x-x2) 2 +c3(x-x3) 3 +d3 is located on the interval [x3,x4];

[0062] In addition, the three curves must also meet the following three constraints:

[0063] N j (x j )=y j ,N j (x j+1 )=y j+1 , where j = 1, 2, 3, 4.

[0064] N' j-1 (x j )=N' j(x j ), where j = 2, 3, 4.

[0065] N” j-1 (x j )=N” j (x j ), where j = 2, 3, 4.

[0066] Constraint 1 ensures that the data points inserted into the curve N(x) meet the requirements, constraint 2 ensures that the slopes of adjacent curve segments remain consistent where they meet, and constraint 3 ensures that the curvature of the two adjacent curve segments is the same, which is represented by the second-order derivative.

[0067] Judgment A m Vertical deformation curve of beam segment and A m+1 The key point of the fitting degree of the vertical deformation curve of the beam segment is that the coordinate error values ​​of the four coordinate points reach a certain limit.

[0068] A m Beam section: 4 coordinate points: C1(x1,y1), C2(x2,y2), C3(x3,y3), C4(x4,y4);

[0069] A m+1 Beam section: 4 coordinate points: C'1 (x'1, y'1), C'2 (x'2, y'2), C'3 (x'3, y'3), C'4 (x'4, y'4);

[0070] By the least squares method:

[0071] Δ1=(x1-x'1) 2 +(y1-y'1) 2

[0072] Δ2=(x2-x'2) 2 +(y2-y'2) 2

[0073] Δ3=(x3-x'3) 2 +(y3-y'3) 2

[0074] Δ4=(x4-x'4) 2 +(y4-y'4) 2

[0075] When Min(Δ1+Δ2+Δ3+Δ4)<=1×10^(-5), it can be considered that the degree of fitting meets the requirements.

[0076] To estimate the force of the jack 15, the cross section of the beam can be simulated as a continuous beam with a length of l. According to the curve function formula of the continuous beam: Deflection When the transverse deflection of the beam section to be installed is closer to that of the installed beam section, the beam section A m and beam section A m+1 The smaller the lateral displacement difference is, the better it is when Min(Δ1+Δ2+Δ3+Δ4)<=1×

[0077] 10^(-5), at this time we can get the force F of the jack 15.

[0078] According to the on-site measured data, the jack 15 only needs to exert a force F of 20% to 30% of the beam weight G downward. By adjusting A m+1 Continuous deformation curves of beam segments and A m Beam segment deformation curve can achieve A m+1 The line shape of the beam segment and A m Beam segment linear fitting.

[0079] Step 4: When beam section A is to be installed m+1 After the spatial position meets the design and specification requirements, install beam section A in turn. m+1 and installed beam segment A m The middle web, side web, bottom plate, first matching piece and second matching piece are welded together;

[0080] Step 5: After welding is completed, remove the lifting rope 11 and the preset hook 12, and use the inclined lifting rope 8, T m+1 The first tensioning is to the predetermined cable force, which is 30% of the completed bridge cable force;

[0081] Step 6: Install beam section A m+1 and installed beam segment A m The bridge deck 7 is installed, and after installation is completed, it is tensioned for the second time by the inclined sling 8 to a predetermined cable force, which is 70% of the completed bridge cable force;

[0082] Step 7: Cast the wet joints between the bridge decks 7, install the formwork, tie the steel bars, pour the concrete, perform equal strength and maintenance, and further adjust the cable force T of the inclined sling 8 to complete the construction of the entire beam section. Move the auxiliary support 13 to the next beam section to be installed via the track 14 and repeat the above steps to carry out construction.

[0083] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge, characterized in that: The method includes applying an upward force at both ends of the beam section to be installed and a downward force at the middle of the beam section to be installed, thereby adjusting the linear shape of the beam section to be installed to be consistent with the installed beam section, thereby achieving corresponding connection and installation between the beam section to be installed and the installed beam section; a track is provided on the beam section to be installed, and an auxiliary bracket is provided on the track for sliding cooperation, and a jack is installed on the top of the auxiliary bracket. The auxiliary bracket is a square frame structure and a pulley is provided at the bottom, which slides on the track; The specific adjustment steps include: Step 1: One of the beam sections A of the wide composite beam m Connect the lifting rope to the preset hook on the beam segment and lift the beam segment A m Hoisted to the set position as installed beam segment A m , the corresponding inclined sling T m Tensioning to the predetermined cable force; Step 2: Connect the lifting cable to the beam section A to be installed m+1 Connect the preset hook on the beam segment A to be installed m+1 Lift to the set position and install the installed beam section A in turn m With the beam segment A to be installed m+1 Temporarily connecting the middle web, side web, bottom plate, first matching piece and second matching piece; Step 3: Fit the auxiliary bracket to the track through the pulley and slide it along the track to the beam section A to be installed m+1 The set position of the beam segment A is to be installed by slings m+1 Apply upward forces T1 and T2 at both ends of the beam to install beam section A through the jack m+1 A downward force F is applied to the middle of the beam section A to be installed. m+1 Vertical deformation in transverse direction of bridge and installed beam segment A m Linear fitting of vertical deformation in the transverse direction of the bridge; Step 4: Install beam section A in sequence m+1 and installed beam segment A m The middle web, side web, bottom plate, first matching piece and second matching piece are welded together; Step 5: After welding is completed, remove the lifting rope and the preset hook, and use the inclined lifting rope to tension the rope to the predetermined tension for the first time; Step 6: Install beam section A m+1 and installed beam segment A m The bridge deck is installed and tensioned for the second time to the predetermined cable force through the inclined slings; Step 7: Cast the wet joints between the bridge decks to complete the construction of the entire beam section, and move the auxiliary support to the next beam section to be installed via the track, and repeat the above steps for construction.

2. The method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge according to claim 1, characterized in that: The two ends of the beam section to be installed apply an upward force through the slings, and the middle part of the beam section to be installed applies a downward force through the jack.

3. The method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge according to claim 1, characterized in that: The webs of the beam section to be installed and the installed beam section correspond to each other in position, the bottom plates correspond to each other in position, and the matching parts correspond to each other in position.

4. The method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge according to claim 1, characterized in that: The downward force F exerted by the jack is 20%~30% of the beam weight G.

5. The method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge according to claim 4, characterized in that: Beam segment A has been installed in step 1 m After the hoisting is completed, mark the four coordinate points C1, C2, C3, and C4 corresponding to the middle of the top and bottom webs. In step 3, the beam section A to be installed m+1 After the hoisting is in place and the jack is installed in place, measure the corresponding There are 4 coordinate points in total, for hoisting beam section A m+1 After applying corresponding forces at both ends and the middle, the beam section A to be installed is measured. m+1 The spatial position of the top, bottom and middle of the web is recorded. There are 4 coordinate points in total, which are the beam section A to be installed at this time. m+1 The vertical deformation curve of the transverse bridge direction and the installed beam segment A m The vertical deformation curve of the transverse bridge is fitted, and the line passing through the four points is defined as a set of multi-segment curves. These three curves are expressed by the following formula: Located in the interval superior; Located in the interval superior; Located in the interval superior; In addition, the three curves must also meet the following three constraints: , where j=1,2,3,4; ensure the curve N(x) The inserted data points meet the requirements; , where j = 2, 3, or 4; so that the slopes of adjacent curve segments remain consistent where they intersect; , where j=2,3,4; ensure that the curvature of the two adjacent curve segments is the same.

6. The method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge according to claim 5, characterized in that: Beam section A to be installed m+1 The vertical deformation curve of the transverse bridge direction and the installed beam segment A m The vertical deformation curve fitting of the transverse bridge direction meets the requirements: ,in, ; .

7. The method for adjusting the installation line shape of a wide composite beam of a cable-stayed bridge according to claim 6, characterized in that: The method for estimating the downward force F exerted by the jack is to simulate the cross section of the beam segment as a continuous beam with a length of l , according to the curve function formula of continuous beam: when , when the transverse deflection of the beam section to be installed is closer to that of the installed beam section, the beam section A m and beam section A m+1 The smaller the lateral displacement difference is, the better it is when , at this time the jack force F can be obtained.

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