Inclined web type steel truss girder construction method

Abstract

According to the inclined web type steel truss girder construction method, the steel beams are connected through the transverse moving support and continuous swing moving, the problem that after the steel beams are lifted, the swing moving angle is too large and exceeds the requirement for the swing moving angle of a cable load crane is solved, and meanwhile the problem that closure cannot be conducted due to conflict of upper chord members and lower chord members of steel beam sections when closure sections are lifted is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method of an inclined-belly steel truss. Background Art

[0002] When constructing steel trusses of suspension bridges, the commonly used method is: after the beam transport ship transports the steel beam segment to the designated location in the river, it uses a cable-mounted crane to lift it vertically. Since the side span cannot be equipped with a cable-mounted crane and the beam transport ship cannot reach the designated location in the shallow water area of ​​the middle span, a sliding bracket is set up in the shallow water area of ​​the side span and the middle span, and the beam segment is lifted vertically by a cable-mounted crane, swung to the sliding bracket, and finally slid to the designated location through the sliding bracket, and finally the steel beam segment is assembled.

[0003] This method is no longer applicable to inclined belly steel trusses, and there are the following problems:

[0004] Problem 1: In the shallow water area of ​​the middle span, the steel beam segment cannot be transported to the vertical lifting position, so a sliding bracket is set up in this area. After the steel beam segment is vertically lifted from the beam transport ship, it needs to be swung to the sliding bracket. The swing angle is too large during the first swing, exceeding the swing angle requirement of the cable crane (required to be less than 20°). Figure 1 shown.

[0005] Problem 2: When lifting the joint section, the upper and lower chords of the steel beam segment conflict and cannot be closed. Figure 2 shown.

[0006] In view of the above problems, a method suitable for the construction of inclined-belly steel trusses is required. Summary of the invention

[0007] In view of this, the present invention aims to propose a construction method of an inclined-belly steel truss to solve the above-mentioned problem.

[0008] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0009] A method for constructing an oblique-belly steel truss beam, the method comprising the following steps:

[0010] 1) The beam section is transported to the lifting position by the beam transport ship, and then the cable-mounted crane moves to the position of the sling cable 7 to lift the beam section to the height before the swing movement; a temporary sling cable is connected to the lower end of the sling cable 6, and the lower anchor head is connected to the sling cable ear plate of the beam section;

[0011] 2) The cable-mounted crane slowly unloads the beam section, causing it to swing to the position of the sling six;

[0012] 3) Then move the cable crane to the position of the sling 5 and anchor it;

[0013] 4) Slowly load and lift the beam section through the cable crane, so that the beam section swings to the position of the sling cable 5, release the connection between the temporary sling cable and the beam section, and lower the beam section to the low-position support by the cable crane;

[0014] 5) Slide the beam segment on the low-level platform toward the side span to the predetermined position. Referring to steps 1)-4), hoist and swing other beam segments onto the low-level platform in sequence, and slide them toward the side span to the predetermined position.

[0015] 6) The cable crane moves to the position of the third sling, the cable crane hoist is connected to the beam section and lifts the beam section to the height before the swing, the lower anchor head of the second sling is connected to the ear plate of the beam section sling, and the cable crane is slowly unloaded to make the beam section swing to the position of the second sling;

[0016] 7) The cable crane moves to the position of the first sling and anchors it. The cable crane slowly loads and lifts the steel beam, so that the beam section swings to the position of the first sling, releases the connection between the sling and the beam section, and lowers the beam section to the high-position bracket by the cable crane;

[0017] 8) The beam section is moved longitudinally along the slideway on the high-position support to its position, and the other beam sections are hoisted onto the high-position support in sequence according to steps 6)-7), and one of the beam sections is moved transversely to the high-position transverse support;

[0018] 9) Move the middle beam section located on the low-position support horizontally along the low-position horizontal support to the outside of the main beam;

[0019] 10) Lift the middle span steel truss girder segments from the middle span to both sides in sequence. The cable crane is fixed at the position of the sling cable 4, and the beam segment below it is lifted from the low-position bracket, and swung to the middle span to the bottom of the sling cable 6; the cable crane moves to the position of the cable clamp 6, lifts the beam segment, removes the temporary sling cable, and continues to lift the beam segment to the designed position, and connects it with the sling cable 6. The beam segment is temporarily connected to the beam segment on its right side; the beam segment on the low-position lateral displacement bracket is horizontally moved to the lifting position;

[0020] 11) Use a cable-mounted crane to sequentially hoist the other beam sections on the low-position support from the low-position support to the left side of the beam section hoisted in step 10) and temporarily connect them to the installed beam section;

[0021] 12) The cable-mounted crane moves to the position of the first sling, lifts the rightmost beam section from the high-position bracket, swings it toward the mid-span to the designed installation position, connects it to the second sling, and temporarily connects it to the leftmost beam section connected in step 11);

[0022] 13) The beam section located on the high-position transverse moving bracket is transversely moved to the lifting position, connected to the sling 1, and temporarily connected to the leftmost beam section connected in step 12);

[0023] 14) Adjust the position and elevation of the beam section on the high-position support and weld it; simultaneously carry out permanent connection of the mid-span steel beam and closing of the beam section.

[0024] Further, in step 5), referring to steps 1)-4) of moving beam segment 1, beam segment 2 is hoisted and swung to the low-level platform, and then slid toward the side span to a predetermined position.

[0025] Further, in step 8), referring to steps 6)-7), beam segments 2 to 9 are hoisted to the high-position supports in sequence by a continuous swinging method, wherein beam segment 8 is longitudinally moved into place and then laterally moved along the high-position transverse support; at the same time, referring to steps 1)-5), beam segments 10 to 12 are hoisted to the low-position supports.

[0026] Further, in step 9), the low-position transverse support of beam section 12 is transversely moved to the outside of the main beam; the cable-mounted crane is anchored successively to the positions of sling seven and sling five, and referring to steps 1)-5), the beam section 13 is lifted to the low-position support by the continuous swinging method.

[0027] Compared with the prior art, the oblique-belly steel truss construction method of the present invention has the following advantages:

[0028] 1. Use a transverse bracket to solve the problem of conflict between the upper and lower chords of the steel beam segment when lifting the joint section, making it impossible to close the joint.

[0029] 2. The use of high and low position sliding brackets can save certain materials.

[0030] 3. Continuous swinging is adopted with a small swinging angle to meet the swinging angle requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 This is the structural diagram of Problem 1;

[0033] Figure 2 This is the structural diagram of Problem 2;

[0034] Figure 3 The structural diagram corresponding to step 1 in the embodiment, (a) is a main view, (b) is a top view;

[0035] Figure 4 The structural diagram corresponding to step 2 in the embodiment, (a) is a main view, (b) is a top view;

[0036] Figure 5 The structural diagram corresponding to step 3 in the embodiment, (a) is a main view, (b) is a top view;

[0037] Figure 6The structural diagram corresponding to step 4 in the embodiment, (a) is a main view, (b) is a top view;

[0038] Figure 7 The structural diagram corresponding to step 5 in the embodiment, (a) is a main view, (b) is a top view;

[0039] Figure 8 The structural diagram corresponding to step 6 in the embodiment, (a) is a main view, (b) is a top view;

[0040] Fig. 9 The structural diagram corresponding to step 7 in the embodiment, (a) is a main view, (b) is a top view;

[0041] Fig.10 The structural diagram corresponding to step eight in the embodiment, (a) is a main view, (b) is a top view;

[0042] Fig.11 The structural diagram corresponding to step nine in the embodiment, (a) is a main view, (b) is a top view;

[0043] Fig.12 The structural diagram corresponding to step 10 in the embodiment, (a) is a main view, (b) is a top view;

[0044] Fig.13 : is a structural diagram corresponding to step 11 in the embodiment, (a) is a main view, (b) is a top view;

[0045] Fig.14 : is a structural diagram corresponding to step 12 in the embodiment, (a) is a main view, (b) is a top view;

[0046] Fig.15 1 is a structural diagram corresponding to step 13 in the embodiment, (a) is a main view, and (b) is a top view.

[0047] Description of reference numerals:

[0048] 1. Auxiliary pier; 2. Main pier and main tower; 3. High-position support; 3-1. High-position horizontal support; 4. Low-position support; 4-1. Low-position horizontal support; 5. Main cable; 6. Lifting rope one; 7. Lifting rope two; 8. Lifting rope three; 9. Lifting rope four; 10. Lifting rope five; 11. Lifting rope six; 12. Lifting rope seven; 13. Lifting rope eight; 14. Temporary sling; 15. Beam transport ship; 16. Cable-mounted crane; 17. Beam section one; 18. Beam section two; 19. Beam section three; 20. Beam section four; 21. Beam section five; 22. Beam section six; 23. Beam section seven; 24. Beam section eight; 25. Beam section nine; 26. Beam section ten; 27. Beam section eleven; 28. Beam section twelve; 29. ​​Beam section thirteen; 30. Beam section fourteen; 31. Beam section fifteen. DETAILED DESCRIPTION

[0049] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0051] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] A method for constructing an oblique-belly steel truss beam, the method comprising the following steps:

[0054] Step 1, such as Figure 3 As shown:

[0055] 1. The bridge construction mainly includes the following structures: auxiliary pier 1, main pier and main tower 2, high-position support 3, high-position lateral support 3-1, low-position support 4, low-position lateral support 4-1, main cable 5, sling 16-sling 813, temporary sling 14, beam transport ship 15, cable-carrying crane 16 and beam section 17-beam section 1531.

[0056] 2. The beam transport ship 15 transports the beam segment 17 to the lifting position.

[0057] 3. The cable-mounted crane 16 moves to the position of the sling cable 12 and lifts the beam section to a controlled height before swinging.

[0058] 4. A temporary sling 14 is connected to the lower end of sling six 11, and the lower anchor head is connected to the sling ear plate of beam section one 17.

[0059] Step 2, such as Figure 4 As shown:

[0060] The cable-mounted crane 16 is used to slowly unload the beam section 17 so that the beam section 17 is swung to the position of the sling 6 11.

[0061] Step three, such as Figure 5 As shown:

[0062] The cable-carrying crane 16 moves to the position of the sling 5 10 and anchors it.

[0063] Step 4: Figure 6 As shown:

[0064] 1. Slowly load and lift the steel beam by means of the cable-mounted crane 16, so that the beam section 1 17 swings to the position of the sling 5 10.

[0065] 2. Release the connection between the temporary sling 14 and the beam section 17, and lower the beam section 17 to the low-position support 4 by the cable-mounted crane 16.

[0066] Step 5: Figure 7 As shown:

[0067] 1. Slide beam segment 17 on the low platform 4 toward the side span to a predetermined position.

[0068] 2. Referring to beam segment 1 17, beam segment 2 18 is hoisted and swung to the low-level platform 4 in sequence, and then slid to the side span to the predetermined position.

[0069] Step 6: Figure 8 As shown:

[0070] 1. The cable-mounted crane 16 moves to the position of the sling three 8, and the cable-mounted crane 16 hoist is connected with the beam section one 17 and lifts the beam section to the control height before swinging.

[0071] 2. The lower anchor head of the sling 27 is connected to the sling ear plate of the beam section 17, and the cable-mounted crane 16 is used to slowly unload the beam section 17, so that the beam section 17 swings to the position of the sling 27.

[0072] Step 7: Fig. 9 As shown:

[0073] 1. The cable-mounted crane 16 moves to the cable clamp 6 position and anchors.

[0074] 2. The cable-mounted crane 16 slowly loads and lifts the steel beam, causing the beam section 17 to swing to the position of the sling 6.

[0075] 3. Release the connection between the sling 2 7 and the beam section, and lower the beam section 1 17 to the high-position support 3 by the cable-mounted crane 16 .

[0076] Step 8: Fig.10 As shown:

[0077] 1. Beam section 17 is longitudinally moved into position along the upper slideway of the high-position support 3.

[0078] 2. Referring to the lifting process of beam segment 17, the beam segments 2 18 to 9 25 are lifted onto the high-position support 3 in sequence using the continuous swinging method. After beam segment 8 24 is longitudinally moved into place, it is laterally moved along the high-position transverse support 3-1.

[0079] 3. Refer to the hoisting process of beam section 1 17 to beam section 9 25, and hoist beam section 10 26 to beam section 12 28 onto the low-position support 4.

[0080] Step nine, such as Fig.11 As shown:

[0081] 1. Move beam section 12 28 horizontally along the low-position horizontal support 4-1 to the outside of the main beam.

[0082] 2. The cable-mounted crane 16 is anchored successively to the positions of the sling cable 7 12 and the sling cable 5 10, and with reference to the lifting of the beam segment 1 17 to the beam segment 12 28, the beam segment 13 29 is lifted to the low-position support 4 by the continuous swinging method.

[0083] Step 10: Fig.12 As shown:

[0084] 1. Lift the mid-span steel truss segments from the middle of the span to both sides in sequence.

[0085] 2. The cable-mounted crane 16 is fixed to the position of the cable clamp 5 10, and lifts the beam section 13 29 from the low-position bracket, and swings to the bottom of the suspension cable 6 11 toward the middle span.

[0086] 3. The cable-mounted crane 16 moves to the position of the cable clamp 6 11 , lifts the beam section 13 29 , removes the temporary sling, continues to lift the beam section 13 29 to the designed position, and connects it with the sling 11 .

[0087] 4. Beam section 13 29 is temporarily connected to beam section 14 30, and the right side of beam section 14 30 is also connected to beam section 15 31, and beam section 12 28 is moved horizontally to the lifting position.

[0088] Step 11: Fig.13 As shown:

[0089] The cable-mounted crane 16 is used to sequentially hoist the beam segments 12 28 to 10 26 from the low-level platform 4 into place and temporarily connect them with the installed beam segments.

[0090] Step 12: Fig.14 As shown:

[0091] 1. The cable-mounted crane 16 moves to the position of the sling 1 6, lifts the beam section 9 25 from the high-position bracket, swings it toward the mid-span to the designed installation position, connects it with the sling 2 7, and temporarily connects it with the beam section 10 26.

[0092] 2. Beam section eight 24 is moved horizontally to the lifting position, connected to sling one 6, and temporarily connected to beam section nine 25.

[0093] Step 13: Fig.15 As shown:

[0094] 1. Adjust the position and elevation of beam section 17 to beam section 9 25 and weld them.

[0095] 2. Simultaneously carry out permanent connection of mid-span steel beams.

[0096] 3. The steel beam is closed at beam section 824.

[0097] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for constructing an oblique-belly steel truss, characterized in that: The method comprises the following steps: 1) The beam section is transported to the lifting position by the beam transport ship, and then the cable-mounted crane moves to the position of the sling cable 7 to lift the beam section to the height before the swing movement; a temporary sling cable is connected to the lower end of the sling cable 6, and the lower anchor head is connected to the sling cable ear plate of the beam section; 2) The cable-mounted crane slowly unloads the beam section, causing it to swing to the position of the sling six; 3) Then move the cable crane to the position of the sling 5 and anchor it; 4) Slowly load and lift the beam section through the cable crane, so that the beam section swings to the position of the sling cable 5, release the connection between the temporary sling cable and the beam section, and lower the beam section to the low-position support by the cable crane; 5) Slide the beam segment on the low-level platform toward the side span to the predetermined position. Referring to steps 1)-4), hoist and swing other beam segments onto the low-level platform in sequence, and slide them toward the side span to the predetermined position. 6) The cable crane moves to the position of the third sling, the cable crane hoist is connected to the beam section and lifts the beam section to the height before the swing, the lower anchor head of the second sling is connected to the ear plate of the beam section sling, and the cable crane is slowly unloaded to make the beam section swing to the position of the second sling; 7) The cable crane moves to the position of the first sling and anchors it. The cable crane slowly loads and lifts the steel beam, so that the beam section swings to the position of the first sling, releases the connection between the sling and the beam section, and lowers the beam section to the high-position bracket by the cable crane; 8) The beam section is moved longitudinally along the slideway on the high-position support to its position, and the other beam sections are hoisted onto the high-position support in sequence according to steps 6)-7), and one of the beam sections is moved transversely to the high-position transverse support; 9) Move the middle beam section located on the low-position support horizontally along the low-position horizontal support to the outside of the main beam; 10) Lift the middle span steel truss girder segments from the middle span to both sides in sequence. The cable crane is fixed at the position of the sling cable 4, and the beam segment below it is lifted from the low-position bracket, and swung to the middle span to the bottom of the sling cable 6; the cable crane moves to the position of the cable clamp 6, lifts the beam segment, removes the temporary sling cable, and continues to lift the beam segment to the designed position, and connects it with the sling cable 6. The beam segment is temporarily connected to the beam segment on its right side; the beam segment on the low-position lateral displacement bracket is horizontally moved to the lifting position; 11) Use a cable-mounted crane to sequentially hoist the other beam sections on the low-position support from the low-position support to the left side of the beam section hoisted in step 10) and temporarily connect them to the installed beam section; 12) The cable-mounted crane moves to the position of the first sling, lifts the rightmost beam section from the high-position bracket, swings it toward the mid-span to the designed installation position, connects it to the second sling, and temporarily connects it to the leftmost beam section connected in step 11); 13) The beam section located on the high-position transverse moving bracket is transversely moved to the lifting position, connected to the sling 1, and temporarily connected to the leftmost beam section connected in step 12); 14) Adjust the position and elevation of the beam section on the high-position support and weld it; simultaneously carry out permanent connection of the mid-span steel beam and closing of the beam section.

2. The construction method of the oblique-belly steel truss according to claim 1 is characterized in that: In step 5), referring to steps 1)-4) of moving beam segment 1, beam segment 2 is hoisted and swung to the low-level platform, and then slid toward the side span to the predetermined position.

3. The construction method of the oblique-belly steel truss according to claim 1 is characterized in that: In step 8), refer to steps 6)-7) and use the continuous swinging method to lift beam segments 2 to 9 to the high-level support in turn, among which beam segment 8 is moved longitudinally into place and then moved horizontally along the high-level horizontal support; at the same time, refer to steps 1)-5) and lift beam segments 10 to 12 to the low-level support.

4. The construction method of the oblique-belly steel truss according to claim 3 is characterized in that: In step 9), the low-position transverse support of beam section 12 is transversely moved to the outside of the main beam; the cable-mounted crane is anchored to the positions of sling seven and sling five in succession, and referring to steps 1)-5), the beam section 13 is lifted to the low-position support by the continuous swinging method.

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