Steel truss girder construction method in limited space

Abstract

The invention provides a steel truss girder construction method in a limited space, and relates to the field of building construction.The method comprises the steps that supporting mechanisms are set up on the two sides of a bridge tower, a traction mechanism is arranged above the supporting mechanisms on the two sides, the traction mechanism is borne by a bracket, and a lower chord and a first side web member which are connected are hoisted to the traction mechanism; and pulling the lower chord member by utilizing a traction mechanism until the lower chord member moves to the lower part of the lower cross beam. And hoisting a second side web member from the second side of the lower cross beam, and fixedly connecting the second side web member with the lower chord member, so that the first side web member and the second side web member are respectively positioned on the two sides of the lower cross beam. And the lower chord is jacked up, the section, located above the bracket, of the sliding way is dismantled, a wind-resistant support body is arranged between the bracket and the lower chord, and the lower chord is supported through the wind-resistant support body. And the upper chord is hoisted through the space above the lower cross beam, and the upper chord is fixedly connected with the first side web member and the second side web member at the same time. Construction is simple, efficiency is high, and safety is high.

Description

Technical Field

[0001] The invention relates to the field of building construction, and in particular to a steel truss construction method in a limited space. Background Art

[0002] In the field of bridges, there are various types of bridges, and steel truss bridges are one of the most widely used bridge types due to their diverse structural forms, large spanning capacity, and high bearing capacity. Among them, steel trusses refer to trusses made of steel. For industrial and civil buildings, roof structures, crane beams, bridges, hydraulic gates, etc., steel trusses are often used as the main load-bearing components; various towers, such as mast towers, TV towers, and transmission line towers, often use spatial steel trusses composed of three, four, or more plane trusses.

[0003] The inventors have found that the existing steel truss bridge construction has at least the following disadvantages:

[0004] The main bridge of the steel truss bridge is set as a hollow structure, which is equipped with an upper beam and a lower beam. The upper beam is located above the lower beam, and both the upper beam and the lower beam extend in the width direction of the main bridge. The lower beam passes through the main truss of the steel truss bridge, and there is a cross structure between the two. The traditional method of installing the main truss on the lower beam by hoisting is prone to interference, making the construction difficult, posing safety hazards, and low construction efficiency. Summary of the invention

[0005] The object of the present invention is to provide a steel truss construction method in a limited space, which can reduce the construction difficulty, reduce safety hazards and improve construction efficiency.

[0006] The embodiment of the present invention is achieved as follows:

[0007] In a first aspect, the present invention provides a method for constructing a steel truss in a limited space, which is used to install the steel truss in a vase-shaped tower, wherein the steel truss comprises an upper chord, a lower chord, a first side web and a second side web, wherein two ends of the first side web are respectively connected to the upper chord and the lower chord, and two ends of the second side web are respectively connected to the upper chord and the lower chord; the vase-shaped tower comprises a bridge tower, a corbel and a lower crossbeam, wherein the corbel and the lower crossbeam are both installed in a hollow structure of the bridge tower, and the corbel is located below the lower crossbeam. The construction method comprises the following steps:

[0008] Step s100, building support mechanisms on both sides of the bridge tower, and arranging traction mechanisms above the support mechanisms on both sides, so that the slideway of the traction mechanism transversely passes through the space between the corbel and the lower crossbeam, and the traction mechanism is supported by the corbel;

[0009] Step s200, hoisting the connected lower chord and the first side web onto the traction mechanism, so that the lower chord is carried by the traction mechanism, and using the traction mechanism to pull the lower chord so that the lower chord approaches the lower cross beam until the lower chord moves below the lower cross beam and the first side web is located on a first side of the lower cross beam;

[0010] Step s300, hoisting the second side web member from a second side of the lower cross beam opposite to the first side, and fixedly connecting the second side web member to the lower chord, so that the first side web member and the second side web member are respectively located on two sides of the lower cross beam;

[0011] Step s400, jacking up the lower chord so that there is a vertical spacing between it and the corbel, removing the section of the slideway located above the corbel, setting a wind-resistant support body between the corbel and the lower chord, and supporting the lower chord through the wind-resistant support body;

[0012] Step s500, using the space above the lower cross beam to hoist the upper chord, moving the upper chord to above the lower cross beam, and fixing the upper chord to the first side web member and the second side web member at the same time.

[0013] In an optional embodiment, in step s100, the step of setting a traction mechanism above the supporting mechanisms on both sides includes: first installing two slide beams spaced apart in the length direction of the lower cross beam above the two supporting mechanisms, installing a guide plate above each of the slide beams, and applying a lubricating medium on the guide plates.

[0014] Based on the above solution, by setting the slideway beam, the sliding direction of the lower chord can be guided, and the stability of the lower chord during sliding can be improved, thereby improving construction safety. Due to the design of the lubricating medium on the slideway beam, the sliding friction can be reduced, thereby saving energy and reducing construction costs.

[0015] In an optional embodiment, a reaction seat, a limit block and a temporary limit piece are installed on the guide plate, the limit block is located between the reaction seat and the temporary limit piece, and the temporary limit piece is located on the first side of the lower cross beam; after the lower chord and the first side web are hoisted onto the guide plate, the lower chord is controlled on the side of the temporary limit piece away from the limit block, and the cable is passed through the reaction seat and connected to the lower chord; then the temporary limit piece is removed, and the lower chord is pulled by the cable to approach the lower cross beam until the lower chord abuts against the limit block located on the second side of the lower cross beam.

[0016] Based on the above scheme, when the lower chord is hoisted onto the slide beam, the lower chord falls onto the slide beam and is carried by the slide beam, and the lower chord is located on the side of the temporary limiter away from the lower cross beam. In this way, during the hoisting process, before the lower chord is stable relative to the slide beam, even if due to misoperation or other reasons, the lower chord will be blocked by the temporary limiter when it approaches the lower cross beam, thus preventing the lower chord from sliding directly onto the lower cross beam and causing accidents such as collisions, thereby greatly improving safety. When the lower chord is stabilized on the slide beam, the cable is matched with the reaction seat and the lower chord, and the temporary limiter is removed. By applying force to the cable, the lower chord can be driven close to the lower cross beam, thereby adjusting the position of the lower chord. The position of the lower chord is controlled by the limiter, and when the lower chord moves to abut the limiter, the pulling is completed.

[0017] In an optional embodiment, the lower chord includes an independent middle lower chord segment, a first side lower chord segment and a second side lower chord segment, and the first side web member includes a first side diagonal member and a first side vertical member;

[0018] In the step s200, the connected middle lower chord section and the first side diagonal rod are hoisted onto the traction mechanism, and pulled to a set position by the traction mechanism;

[0019] After step s400, the first side lower chord section is hoisted from the first side of the lower cross beam so that it is carried by the traction mechanism and approaches the middle lower chord section under the drive of the traction mechanism, and the first side lower chord section is fixedly connected to the middle lower chord section; the first side vertical pole is hoisted from the first side of the lower cross beam, and the lower end of the first side vertical pole is fixed to the first side lower chord section; and then the second side lower chord section is hoisted from the second side of the lower cross beam to the traction mechanism, and approaches the middle lower chord section under the drive of the traction mechanism, and the second side lower chord section is fixedly connected to the middle lower chord section.

[0020] Based on the above solution, the lower chord is divided into multiple independent components for separate hoisting and installation, thereby reducing the construction difficulty and improving the construction efficiency.

[0021] In an optional embodiment, the second side web bar includes a second side diagonal bar and a second side vertical bar;

[0022] After the step of fixedly connecting the second side lower chord segment with the middle lower chord segment, the second side diagonal rod is hoisted from the second side of the lower cross beam, and the lower end of the second side diagonal rod is fixedly connected to the middle lower chord segment; the second side vertical rod is hoisted from the second side of the lower cross beam, and the lower end of the second side vertical rod is fixedly connected to the second side lower chord segment.

[0023] Based on the above scheme, the second side web members are hoisted and installed in a distributed manner to reduce the construction difficulty and improve the construction efficiency.

[0024] In an optional embodiment, the steel truss further includes an intermediate web member, and after the step of fixing the second side lower chord segment to the intermediate lower chord segment, the intermediate web member is hoisted above the lower cross beam, and the intermediate web member is dropped from top to bottom to fix the lower end of the intermediate web member to the intermediate lower chord segment.

[0025] Based on the above solution, the middle web can improve the stability and reliability of the connection structure.

[0026] In an optional embodiment, the upper chord includes a middle upper chord segment, a first side upper chord segment, and a second side upper chord segment;

[0027] After the step of fixedly connecting the lower end of the second side upright with the second side lower chord section, hoisting the middle upper chord section to above the lower cross beam, and fixedly connecting the top end of the middle web member with the middle upper chord section;

[0028] Hoisting the first side upper chord section from the first side of the lower cross beam, fixing the top end of the first side oblique rod and the top end of the first side vertical rod to the first side upper chord section, and fixing the first side upper chord section to the middle upper chord section;

[0029] The second side upper chord section is hoisted from the second side of the lower cross beam, the top end of the second side diagonal rod and the top end of the second side vertical rod are fixedly connected to the second side upper chord section, and the second side upper chord section is fixedly connected to the middle upper chord section.

[0030] Based on the above solution, the upper chord is divided into multiple independent components and each component is hoisted independently, which reduces the construction difficulty and improves the construction efficiency.

[0031] In an optional embodiment, in step s400, the step of lifting the lower chord includes: first arranging a cylinder pad on the embedded plate of the corbel, placing a supporting cylinder on the cylinder pad, using the supporting cylinder to lift the lower chord, and then arranging a wind-resistant bearing pad on the embedded plate.

[0032] Based on the above scheme, by supporting the oil cylinder to lift the lower chord, a stable lifting force can be provided, the construction difficulty can be reduced, and the construction efficiency and safety can be improved.

[0033] In an optional embodiment, after the step of arranging the wind-resistant bearing pad on the embedded plate, the segment of the slideway located above the corbel is removed, and the wind-resistant bearing body is installed between the embedded plate and the lower chord, and then the wind-resistant bearing pad is removed.

[0034] Based on the above scheme, the wind-resistant bearing body is used to support the lower chord, which has high stability.

[0035] In an optional embodiment, the step of building a support mechanism on both sides of the bridge tower includes: connecting a plurality of steel structural members to form a steel structure frame.

[0036] Based on the above solution, the supporting mechanism has a simple structure, high stability, long service life and high safety in use.

[0037] The beneficial effects of the embodiments of the present invention are:

[0038] In summary, the method for constructing a steel truss in a limited space provided by the present embodiment is that since the lower crossbeam and the main truss are prone to interference when they cooperate, in the present embodiment, the main truss is split into multiple parts, the lower chord and the first side web are connected as one and then hoisted together to the traction mechanism, the traction mechanism is used to drive the lower chord and the first side web to slide relative to the lower crossbeam, and the position of the lower chord and the first side web relative to the lower crossbeam is adjusted by sliding, which is convenient for construction and easy to control the traction mechanism, thereby improving the accuracy of the movement of the lower chord and shortening the time for adjusting the position of the lower chord, thereby improving the construction efficiency. Since the first side web gradually slides close to the lower crossbeam, the probability of the first side web colliding with the lower crossbeam can be greatly reduced, and the safety and reliability of the construction can be improved. Hoisting the lower chord and the first side web at the same time can also improve the construction efficiency and reduce the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 is a schematic diagram of a steel truss girder according to an embodiment of the present invention;

[0041] Figure 2 This is a construction process diagram of a steel truss construction method in a limited space according to an embodiment of the present invention.

[0042] icon:

[0043] 001-steel truss; 100-upper chord; 101-middle upper chord section; 102-first side upper chord section; 103-second side upper chord section; 130-lower chord; 131-middle lower chord section; 132-first side lower chord section; 133-second side lower chord section; 150-first side web member; 151-first side diagonal rod; 152-first side vertical rod; 170-second side web member; 171-second side diagonal rod; 172-second side vertical rod; 190-middle web member; 002-vase-shaped tower; 210-bridge tower; 230-corbel; 250-lower crossbeam; 251-first side; 252-second side; 003-support mechanism; 004-traction mechanism; 410-slideway beam; 430-reaction seat; 450-limit block; 470-temporary limit piece. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0047] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0048] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the prior art, when the main truss is hoisted, the main truss and the lower cross beam 250 are easily interfered, the construction safety is low, the operation is difficult, and the construction efficiency is low. After the main truss is hoisted to the corresponding position of the lower cross beam 250, the position is adjusted by traditional techniques such as walking jacking, which is difficult to construct and has low construction efficiency.

[0051] In view of this, the designer provides a steel truss beam construction method in a limited space, which can reduce the construction difficulty, improve the construction efficiency, and improve the construction safety and reliability.

[0052] Please combine Figure 1 In this embodiment, it should be noted that the steel truss beam cooperates with the vase-shaped tower 002, wherein the steel truss beam 001 includes an upper chord 100, a lower chord 130, a first side web member 150, a second side web member 170 and an intermediate web member 190, the two ends of the first side web member 150 are respectively connected to the upper chord 100 and the lower chord 130, the two ends of the second side web member 170 are respectively connected to the upper chord 100 and the lower chord 130, and the two ends of the intermediate web member 190 are respectively connected to the upper chord 100 and the lower chord 130. The vase-shaped tower 002 includes a bridge tower 210, a corbel 230 and a lower cross beam 250, the corbel 230 and the lower cross beam 250 are both installed in the hollow structure of the bridge tower 210, and the corbel 230 is located below the lower cross beam 250. There are two lower cross beams 250 , which are arranged in parallel and spaced apart with a distance therebetween to accommodate the middle web member 190 .

[0053] Please combine Figure 1 and Figure 2 In this embodiment, the steel truss construction method in a limited space includes the following steps:

[0054] Step s100, build support mechanisms 003 on both sides of the bridge tower 210, and set traction mechanisms 004 above the support mechanisms 003 on both sides, so that the slideway of the traction mechanism 004 transversely passes through the space between the bracket 230 and the lower crossbeam 250, and the traction mechanism 004 is supported by the bracket 230;

[0055] Step s200, hoisting the connected lower chord 130 and the first side web member 150 onto the traction mechanism 004, so that the lower chord 130 is carried by the traction mechanism 004, and using the traction mechanism 004 to pull the lower chord 130, so that the lower chord 130 is close to the lower cross beam 250, until the lower chord 130 moves to below the lower cross beam 250, and the first side web member 150 is located at the first side 251 of the lower cross beam 250;

[0056] Step s300, hoisting the second side web member 170 from the second side 252 of the lower cross beam 250 opposite to the first side 251, and fixing the second side web member 170 to the lower chord 130, so that the first side web member 150 and the second side web member 170 are respectively located on both sides of the lower cross beam 250;

[0057] Step s400, lift up the lower chord 130 so that there is a vertical distance between it and the corbel 230, remove the section of the slideway above the corbel 230, set a wind-resistant support body between the corbel 230 and the lower chord 130, and support the lower chord 130 through the wind-resistant support body;

[0058] Step s500 , using the space above the lower cross beam 250 to hoist the upper chord 100 , moving the upper chord 100 to above the lower cross beam 250 , and fixing the upper chord 100 to the first side web member 150 and the second side web member 170 at the same time.

[0059] The steel truss construction method in a limited space provided by this embodiment has at least the following advantages:

[0060] Since the lower cross beam 250 and the main truss are easy to interfere with each other when they cooperate, in this embodiment, the main truss is split into multiple parts, the lower chord 130 and the first side web 150 are connected as a whole and then hoisted together to the traction mechanism 004, and the traction mechanism 004 is used to drive the lower chord 130 and the first side web 150 to slide relative to the lower cross beam 250, and the position of the lower chord 130 and the first side web 150 relative to the lower cross beam 250 is adjusted by sliding, which is convenient for construction and easy to control the traction mechanism 004, thereby improving the accuracy of the movement of the lower chord 130, shortening the time for adjusting the position of the lower chord 130, and improving the construction efficiency. Since the first side web 150 gradually slides close to the lower cross beam 250, the probability of the first side web 150 colliding with the lower cross beam 250 can be greatly reduced, and the safety and reliability of the construction can be improved. Hoisting the lower chord 130 and the first side web 150 at the same time can also improve the construction efficiency and reduce the construction cost.

[0061] The following embodiments illustrate the details of the steel truss construction method in a limited space provided by the present application by way of examples.

[0062] In this embodiment, optionally, in step s100, the step of setting the traction mechanism 004 above the support mechanism 003 on both sides includes: first, two slide beams 410 arranged at intervals in the length direction of the lower crossbeam 250 are installed above the two support mechanisms 003, a guide plate is installed above each slide beam 410, and a lubricating medium is applied to the guide plate. It should be understood that the slide beam 410 can be set to a segmented structure, and multiple segments of the slide beam 410 can be arranged in sequence and welded on the support mechanism 003, or adjacent segments of the slide beam 410 can be connected by a fastener or other structure to facilitate the disassembly of adjacent slide beams 410.

[0063] It should be understood that the slideway beam 410 can guide the sliding direction of the lower chord 130 and improve the stability of the lower chord 130 during sliding, thereby improving construction safety. The design of the lubricating medium on the slideway beam 410 can reduce sliding friction, thereby saving energy and reducing construction costs.

[0064] In addition, the guide plate can also be set to a split type, and multiple guide plates can be connected in sequence to reduce construction costs.

[0065] In this embodiment, a reaction seat 430, a stopper 450 and a temporary stopper 470 are optionally installed on the guide plate. The stopper 450 is located between the reaction seat 430 and the temporary stopper 470, and the temporary stopper 470 is located on the first side 251 of the lower cross beam 250; after the lower chord 130 and the first side web 150 are hoisted onto the guide plate, the lower chord 130 is controlled to be on the side of the temporary stopper 470 away from the stopper 450, and the cable is passed through the reaction seat 430 and connected to the lower chord 130; then the temporary stopper 470 is removed, and the lower chord 130 is pulled by the cable to make the lower chord 130 close to the lower cross beam 250 until the lower chord 130 abuts against the stopper 450 located on the second side 252 of the lower cross beam 250.

[0066] It should be noted that when the lower chord 130 is hoisted onto the slide beam 410, the lower chord 130 falls on the slide beam 410 and is carried by the slide beam 410, and the lower chord 130 is located on the side of the temporary stopper 470 away from the lower cross beam 250. In this way, during the hoisting process, before the lower chord 130 is stable relative to the slide beam 410, even if due to misoperation or other reasons, the lower chord 130 will be blocked by the temporary stopper 470 during the process of approaching the lower cross beam 250, thereby preventing the lower chord 130 from sliding directly onto the lower cross beam 250 and causing accidents such as collisions, thereby greatly improving safety. After the lower chord 130 is stabilized on the slide beam 410, the cable is matched with the reaction seat 430 and the lower chord 130, and the temporary stopper 470 is removed. By applying force to the cable, the lower chord 130 can be driven close to the lower cross beam 250, thereby achieving position adjustment of the lower chord 130. The position of the lower chord rod 130 is controlled by the limit block 450 , and when the lower chord rod 130 moves to abut against the limit block 450 , the pulling is completed.

[0067] It should be understood that some structural members are pulled from the first side 251 of the lower cross beam 250 close to the lower cross beam 250, and some structural members are pulled from the second side 252 of the lower cross beam 250 close to the lower cross beam 250. Therefore, the number and position of the reaction seat 430, the limit block 450 and the temporary limit member 470 are set as required, which can ensure that the structural members can be effectively pulled and limited when hoisting from the first side 251 and the second side 252 of the lower cross beam 250, thereby improving the convenience and safety of construction. In this embodiment, the hoisting of the relevant structural members from the first side 251 of the lower cross beam 250 is mainly used as an example.

[0068] In this embodiment, optionally, the lower chord 130 includes an independent middle lower chord segment 131 , a first side lower chord segment 132 and a second side lower chord segment 133 , and the first side web member 150 includes a first side diagonal member 151 and a first side vertical member 152 .

[0069] In step s200, the connected middle lower chord section 131 and the first side inclined rod 151 are hoisted onto the traction mechanism 004, and are pulled to a set position by the traction mechanism 004.

[0070] After step s400, the first side lower chord segment 132 is hoisted from the first side 251 of the lower cross beam 250 so that it is carried by the traction mechanism 004 and approaches the middle lower chord segment 131 under the drive of the traction mechanism 004, and the first side lower chord segment 132 is fixedly connected to the middle lower chord segment 131; the first side vertical rod 152 is hoisted from the first side 251 of the lower cross beam 250, and the lower end of the first side vertical rod 152 is fixed to the first side lower chord segment 132; and then the second side lower chord segment 133 is hoisted from the second side 252 of the lower cross beam 250 to the traction mechanism 004, and approaches the middle lower chord segment 131 under the drive of the traction mechanism 004, and the second side lower chord segment 133 is fixedly connected to the middle lower chord segment 131.

[0071] It should be understood that by dividing the lower chord 130 into a plurality of independent components and hoisting and installing them separately, the construction difficulty is reduced and the construction efficiency is improved.

[0072] In this embodiment, optionally, the second side abdominal rod 170 includes a second side oblique rod 171 and a second side vertical rod 172;

[0073] After the step of fixing the second side lower chord segment 133 to the middle lower chord segment 131, the second side diagonal rod 171 is hoisted from the second side 252 of the lower cross beam 250, and the lower end of the second side diagonal rod 171 is fixedly connected to the middle lower chord segment 131; the second side vertical rod 172 is hoisted from the second side 252 of the lower cross beam 250, and the lower end of the second side vertical rod 172 is fixedly connected to the second side lower chord segment 133.

[0074] With such a design, the second side web members 170 are hoisted and installed in a distributed manner, which reduces the construction difficulty and improves the construction efficiency.

[0075] In this embodiment, optionally, after the step of fixing the lower chord rod 130 on the second side 252 and the middle lower chord segment 130, the middle web rod 190 is hoisted to the top of the lower cross beam 250, and the middle web rod 190 is dropped from top to bottom, and the lower end of the middle web rod 190 is fixedly connected to the middle lower chord segment 131. The middle web rod 190 can improve the stability and reliability of the connection structure. The middle web rod 190 can be hoisted from the first side 251 or the second side 252 of the lower cross beam 250, and the construction is flexible. The reason is that the space above the lower cross beam 250 is sufficient, and the middle web rod 190 can be hoisted to the top of the lower cross beam 250, align the space between the two lower cross beams 250, and then drop the middle web rod 190, which is safe and reliable for construction.

[0076] In this embodiment, the upper chord 100 may include an intermediate upper chord segment 101, a first side upper chord segment 102, and a second side upper chord segment 103; after the step of fixing the lower end of the second side upright 172 to the second side lower chord segment 133, the intermediate upper chord segment 101 is hoisted above the lower cross beam 250, and the top end of the intermediate web member 190 is fixedly connected to the intermediate upper chord segment 101; the first side upper chord segment 102 is hoisted from the first side 251 of the lower cross beam 250, and the second side lower chord segment 133 is fixedly connected to the upper chord segment 101; The top end of the one side diagonal rod 151 and the top end of the first side vertical rod 152 are both fixedly connected to the first side upper chord section 102, and the first side upper chord section 102 is fixedly connected to the middle upper chord section 101; the second side upper chord section 103 is hoisted from the second side 252 of the lower cross beam 250, and the top end of the second side diagonal rod 171 and the top end of the second side vertical rod 172 are both fixedly connected to the second side upper chord section 103, and the second side upper chord section 103 is fixedly connected to the middle upper chord section 101.

[0077] In this way, by splitting the upper chord 100 into a plurality of independent components, each component is hoisted independently, thereby reducing the construction difficulty and improving the construction efficiency.

[0078] It should be understood that the hoisting of the upper chord 100 is not likely to interfere with the lower cross beam 250, because the upper chord 100 is located above the lower cross beam 250, with a larger space, and the hoisting is convenient.

[0079] In this embodiment, optionally, in step s400, the step of lifting the lower chord 130 includes: firstly arranging a cylinder pad on the embedded plate of the corbel 230, placing a supporting cylinder on the cylinder pad, using the supporting cylinder to lift the lower chord 130, and then arranging a wind-resistant bearing pad on the embedded plate. Lifting the lower chord 130 by the supporting cylinder can provide a stable lifting force, reduce the construction difficulty, and improve the construction efficiency and safety.

[0080] It should be understood that the number of oil cylinders can be set as required to ensure that a stable supporting force is provided.

[0081] In this embodiment, optionally, after the step of arranging the wind-resistant support pad on the embedded plate, the section of the slideway located above the corbel 230 is removed, and the wind-resistant support body is installed between the embedded plate and the lower chord 130, and then the wind-resistant support pad is removed. The wind-resistant support body is used to support the lower chord 130, which has high stability.

[0082] It should be understood that the number of wind-resistant support bodies is set as needed and is not specifically limited in this embodiment.

[0083] In this embodiment, optionally, the step of building the support mechanism 003 on both sides of the bridge tower 210 includes: connecting a plurality of steel structural members to form a steel structure frame. The support mechanism 003 has a simple structure, high stability, long service life, and high safety in use.

[0084] The steel truss construction method in a limited space provided in this embodiment is not easy to interfere with the main truss and the lower cross beam 250, and multiple independent structural members are adjusted to the set positions in the hollow structure of the bridge tower 210 by pulling. The position adjustment is accurate, the construction is time-saving and labor-saving, the construction safety is high, and the construction efficiency is high.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for constructing a steel truss beam in a limited space, for installing a steel truss beam (001) in a vase-shaped tower (002), characterized in that: The steel truss (001) comprises an upper chord (100), a lower chord (130), a first side web member (150) and a second side web member (170), wherein two ends of the first side web member (150) are respectively connected to the upper chord (100) and the lower chord (130), and two ends of the second side web member (170) are respectively connected to the upper chord (100) and the lower chord (130); the vase-shaped tower (002) comprises a bridge tower (210), a corbel (230) and a lower cross beam (250), wherein the corbel (230) and the lower cross beam (250) are both installed in the hollow structure of the bridge tower (210), and the corbel (230) is located below the lower cross beam (250). The construction method comprises the following steps: Step s100, building a support mechanism (003) on both sides of the bridge tower (210), and arranging a traction mechanism (004) above the support mechanism (003) on both sides, so that the slideway of the traction mechanism (004) transversely passes through the space between the bracket (230) and the lower crossbeam (250), and the traction mechanism (004) is supported by the bracket (230); Step s200, hoisting the connected lower chord (130) and the first side web (150) onto the traction mechanism (004), so that the lower chord (130) is carried by the traction mechanism (004), and using the traction mechanism (004) to pull the lower chord (130) so that the lower chord (130) is close to the lower cross beam (250), until the lower chord (130) moves below the lower cross beam (250), and the first side web (150) is located on the first side (251) of the lower cross beam (250); Step s300, hoisting the second side web member (170) from the second side (252) of the lower cross beam (250) opposite to the first side (251), and fixing the second side web member (170) to the lower chord member (130), so that the first side web member (150) and the second side web member (170) are respectively located on both sides of the lower cross beam (250); Step s400, lift up the lower chord (130) so that there is a vertical distance between it and the corbel (230), remove the section of the slideway located above the corbel (230), set a wind-resistant support body between the corbel (230) and the lower chord (130), and support the lower chord (130) through the wind-resistant support body; Step s500, using the space above the lower cross beam (250) to hoist the upper chord (100), moving the upper chord (100) to above the lower cross beam (250), and fixing the upper chord (100) to the first side web bar (150) and the second side web bar (170) at the same time.

2. The method for constructing a steel truss beam in a limited space according to claim 1, characterized in that: In the step s100, the step of setting the traction mechanism (004) above the support mechanism (003) on both sides includes: firstly installing two slide beams (410) spaced apart in the length direction of the lower cross beam (250) above the two support mechanisms (003), installing a guide plate above each of the slide beams (410), and applying a lubricating medium on the guide plate.

3. The method for constructing a steel truss beam in a limited space according to claim 2, characterized in that: A reaction seat (430), a limit block (450) and a temporary limit piece (470) are installed on the guide plate, wherein the limit block (450) is located between the reaction seat (430) and the temporary limit piece (470), and the temporary limit piece (470) is located on the first side (251) of the lower cross beam (250); after the lower chord (130) and the first side web member (150) are hoisted onto the guide plate, the lower chord (130) is controlled to be fixed on the temporary limit piece (470). The temporary limiting member (470) is on the side away from the limiting block (450), and the cable is passed through the reaction seat (430) and connected to the lower chord (130); then the temporary limiting member (470) is removed, and the lower chord (130) is pulled by the cable to make the lower chord (130) close to the lower cross beam (250) until the lower chord (130) abuts against the limiting block (450) located on the second side (252) of the lower cross beam (250).

4. The method for constructing a steel truss beam in a limited space according to claim 1, characterized in that: The lower chord (130) includes an independent middle lower chord segment (131), a first side lower chord segment (132) and a second side lower chord segment (133); the first side web member (150) includes a first side diagonal member (151) and a first side vertical member (152); In the step s200, the connected middle lower chord section (131) and the first side diagonal rod (151) are hoisted onto the traction mechanism (004), and pulled to a set position by the traction mechanism (004); After step s400, the first side lower chord segment (132) is hoisted from the first side (251) of the lower cross beam (250) so that it is carried by the traction mechanism (004) and driven by the traction mechanism (004) to approach the middle lower chord segment (131), and the first side lower chord segment (132) is fixedly connected to the middle lower chord segment (131); the first side lower chord segment (132) is hoisted from the first side (251) of the lower cross beam (250) The first side vertical rod (152) is fixed with the lower end of the first side vertical rod (152) on the first side lower chord section (132); and then the second side lower chord section (133) is hoisted from the second side (252) of the lower cross beam (250) to the traction mechanism (004), and driven by the traction mechanism (004) to approach the middle lower chord section (131), and the second side lower chord section (133) is fixedly connected to the middle lower chord section (131).

5. The method for constructing a steel truss beam in a limited space according to claim 4, characterized in that: The second side belly rod (170) comprises a second side diagonal rod (171) and a second side vertical rod (172); After the step of fixing the second side lower chord section (133) to the middle lower chord section (131), the second side oblique rod (171) is hoisted from the second side (252) of the lower cross beam (250), and the lower end of the second side oblique rod (171) is fixedly connected to the middle lower chord section (131); the second side vertical rod (172) is hoisted from the second side (252) of the lower cross beam (250), and the lower end of the second side vertical rod (172) is fixedly connected to the second side lower chord section (133).

6. The method for constructing a steel truss beam in a limited space according to claim 5, characterized in that: The steel truss (001) also includes an intermediate web member (190). After the step of fixing the lower chord member (130) of the second side (252) to the intermediate lower chord segment (130), the intermediate web member (190) is hoisted above the lower cross beam (250), and the intermediate web member (190) is dropped from top to bottom to fix the lower end of the intermediate web member (190) to the intermediate lower chord segment (131).

7. The method for constructing a steel truss beam in a limited space according to claim 6, characterized in that: The upper chord (100) comprises a middle upper chord section (101), a first side upper chord section (102) and a second side upper chord section (103); After the step of fixing the lower end of the second side upright (172) to the second side lower chord section (133), the middle upper chord section (101) is hoisted above the lower cross beam (250), and the top end of the middle web member (190) is fixedly connected to the middle upper chord section (101); The first side upper chord section (102) is hoisted from the first side (251) of the lower cross beam (250), the top end of the first side oblique rod (151) and the top end of the first side vertical rod (152) are fixedly connected to the first side upper chord section (102), and the first side upper chord section (102) is fixedly connected to the middle upper chord section (101); The second side upper chord section (103) is hoisted from the second side (252) of the lower cross beam (250), the top end of the second side diagonal rod (171) and the top end of the second side vertical rod (172) are fixedly connected to the second side upper chord section (103), and the second side upper chord section (103) is fixedly connected to the middle upper chord section (101).

8. The method for constructing a steel truss beam in a limited space according to claim 1, characterized in that: In step s400, the step of lifting the lower chord (130) includes: firstly arranging a cylinder pad on the embedded plate of the corbel (230), placing a supporting cylinder on the cylinder pad, lifting the lower chord (130) by using the supporting cylinder, and then arranging a wind-resistant bearing pad on the embedded plate.

9. The method for constructing a steel truss beam in a limited space according to claim 8, characterized in that: After the step of arranging the wind-resistant bearing pad on the embedded plate, the section of the slideway located above the corbel (230) is removed, and the wind-resistant bearing body is installed between the embedded plate and the lower chord (130), and then the wind-resistant bearing pad is removed.

10. The method for constructing a steel truss beam in a limited space according to claim 1, characterized in that: The step of building a support mechanism (003) on both sides of the bridge tower (210) includes: connecting a plurality of steel structure members to form a steel structure frame.

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