An arch foot restraint device and method for steel pipe arch rib oblique buckle hanging and splicing construction

Abstract

The present application relates to an arch foot restraint device and method for the oblique-pull, buckle-hanging and cantilevered construction of steel tube arch ribs, which belongs to the technical field of bridge construction, including: an arch foot temporary hinge unit, which is arranged between the arch foot embedded section and the first steel tube arch rib segment, and the first steel tube arch rib segment is hingedly connected to the arch foot embedded section through the arch foot temporary hinge unit; an arch foot temporary fixed unit, which is connected between the arch foot embedded section and the first steel tube arch rib segment, and the first steel tube arch rib segment is fixedly connected to the arch foot embedded section through the arch foot temporary fixed unit; an arch foot stress monitoring unit, which is used to monitor the stress state of the first steel tube arch rib segment. The arch foot restraint device of the present application restrains the arch foot embedded section and the first steel tube arch rib segment through the arch foot temporary hinge unit and the arch foot temporary fixed unit. This restraint method can not only ensure the safety and stability of the arch rib structure, but also facilitate the adjustment of the arch rib line shape, and avoid the generation of adverse bending moments in the arch foot area.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to an arch foot restraint device and method for the oblique buckle-hanging cantilever construction of steel tube arch ribs. Background Art

[0002] Steel tube concrete arch bridge is a common bridge type. The main methods for the construction of steel tube arch ribs are the bracket method, the rotation method and the cable hoisting inclined buckle hanging method. Among them, the bracket method and the rotation method require a sufficiently suitable construction site, which is difficult to adapt to the U-shaped or V-shaped terrain across the valley. The inclined buckle hanging cantilever assembly method can adapt to all engineering site conditions and is generally more commonly used.

[0003] When the steel tube arch rib is constructed by the inclined buckle hanging method, the commonly used arch foot restraint methods are temporary hinge and consolidation:

[0004] The temporary hinged method of the arch foot means that the arch foot is temporarily hinged during the arch rib hoisting stage. After the arch rib segments are hoisted and closed, the arch rib line shape is adjusted to the target state, and then the arch foot reserved groove concrete is poured to convert the temporary hinged constraint into a fixed constraint to complete the arch rib system conversion. This method is conducive to the adjustment of the arch rib line shape and the stress of the structure, but the structure of the entire hoisting process is a mobile system with extremely poor stability. In typhoon weather, safety accidents may occur due to poor wind resistance stability.

[0005] The arch foot fixed constraint method, that is, the arch foot is directly fixed at the beginning of the arch rib hoisting, and the arch rib line shape can only be adjusted by the anchor cable tension. This constraint method has high arch rib structure stability, but it is not convenient for adjusting the arch rib line shape, and unfavorable bending moment may be generated in the arch foot area.

[0006] During the construction of steel tube arch ribs with inclined buckles and hanging, the temporary hinged and fixed constraints at the arch foot have their own advantages and disadvantages. Which constraint method can ensure the safety and stability of the arch rib structure and facilitate the adjustment of the arch rib line shape? The arch foot area may produce unfavorable bending moments, which is a difficult problem in the construction of steel tube arch ribs with inclined buckles and hanging, and needs to be solved. Summary of the invention

[0007] The embodiment of the present application provides an arch foot restraint device and method for the oblique-pull, buckle-hang and cantilever construction of steel tube arch ribs, so as to solve the problems in the prior art that when the steel tube arch ribs are oblique-pull, buckle-hang and cantilevered, the arch foot adopts temporary hinged restraint, the structure has insufficient stability, and when fixed restraint is adopted, it is not convenient to adjust the arch rib line shape, and there is an unfavorable bending moment in the arch foot area.

[0008] In a first aspect, the present application provides an arch foot restraint device for steel tube arch rib oblique buckle hanging and cantilever splicing construction, comprising:

[0009] An arch foot temporary hinge unit, wherein the arch foot temporary hinge unit is arranged between the arch foot embedded section and the first steel pipe arch rib segment, and the first steel pipe arch rib segment is hingedly connected to the arch foot embedded section through the arch foot temporary hinge unit;

[0010] An arch foot temporary fixing unit, wherein the arch foot temporary fixing unit is connected between the arch foot embedded section and the first steel pipe arch rib segment, and the first steel pipe arch rib segment is fixedly connected to the arch foot embedded section through the arch foot temporary fixing unit;

[0011] The arch foot stress monitoring unit is used to monitor the stress state of the first steel pipe arch rib segment.

[0012] In some embodiments, the temporary articulated unit of the arch foot includes an articulated seat and an articulated body. The articulated seat and the embedded section of the arch foot are cast in the concrete arch seat and form an integral body with the concrete arch seat. The articulated body is fixedly connected to the first section of the steel pipe arch rib segment, and the articulated seat and the articulated body are rotatably connected.

[0013] In some embodiments, the bottom of the hinged seat is connected to embedded steel bars, which are cast in the concrete arch seat and formed as one body with the concrete arch seat, and are welded to the structural steel bars in the concrete arch seat. An arc groove is provided on the top of the hinged seat, and the arc groove is used for rotationally connecting with the hinge body. Limiting plates are provided at both ends of the arc groove, and positioning grooves are provided on the limiting plates for limiting the hinge body in the arc groove. The limiting plates are welded to the hinged seat, and the hinged seat is filled with micro-expansive concrete.

[0014] In some embodiments, the hinged body includes a hinged tube and an inclined rod, the hinged tube is used to be rotatably connected to the hinged seat, and there are multiple inclined rods, which are symmetrically arranged in pairs on both sides of the hinged tube. One end of the inclined rod is welded to the hinged tube, and the other end of the inclined rod is welded to the first section of the steel pipe arch rib segment. A triangular stiffening plate is welded between the two inclined rods symmetrically arranged along the axial direction of the hinged tube.

[0015] In some embodiments, the hinged tube and the diagonal rod are both cylindrical tubular structures, and the hinged tube and the diagonal rod are both filled with micro-expansive concrete. The triangular stiffening plate includes a triangular steel plate and stiffening ribs. The triangular steel plate is an isosceles right-angled steel plate. There are multiple stiffening ribs, and the multiple stiffening ribs are vertically welded on both sides of the triangular steel plate.

[0016] In some embodiments, a flange is welded to the bottom of the embedded section of the arch foot, the flange is cast in the concrete arch seat and forms an integral part with the concrete arch seat, and the flange is welded to the structural steel bars in the concrete arch seat.

[0017] In some embodiments, the arch foot temporary fixing unit includes a first anchor seat, a second anchor seat and a precision-rolled threaded steel bar, the first anchor seat is welded to the arch foot embedded section, the second anchor seat is welded to the first section of the steel pipe arch rib segment and is arranged corresponding to the first anchor seat, and the first anchor seat and the second anchor seat are fixedly connected by the precision-rolled threaded steel bar;

[0018] Both ends of the finished rolled threaded steel are threadedly connected with a first nut and a second nut. The first nut and the second nut at one end of the finished rolled threaded steel are located on both sides of the first anchor seat, and the first nut and the second nut at the other end of the finished rolled threaded steel are located on both sides of the second anchor seat.

[0019] In some embodiments, the arch foot stress monitoring unit includes a stress testing element and an automatic stress collector. The stress testing element is connected to the automatic stress collector via a connecting line. The stress testing element is installed on one side of the first steel pipe arch rib segment connected to the embedded section of the arch foot. The automatic stress collector collects the stress state of the first steel pipe arch rib segment in real time through the stress testing element.

[0020] In some embodiments, the stress testing element is a vibrating-wire strain gauge, the automatic stress collector is provided with an automatic collection module and a data storage device, the automatic stress collector is provided with a wireless transceiver module, and the automatic stress collector can be remotely operated and monitored through the wireless transceiver module.

[0021] In a second aspect of the present application, a method for an arch foot restraint device for steel tube arch rib oblique buckle hanging and cantilever construction is provided, the method comprising the following steps:

[0022] Tie up the structural steel bars of the concrete arch seat, accurately locate the embedded section of the arch foot, weld the flange at the bottom of the embedded section of the arch foot to the structural steel bars, accurately locate the hinge seat of the temporary hinge unit of the arch foot, and weld the embedded steel bars at the bottom of the hinge seat to the structural steel bars;

[0023] Cast concrete arch seat, reserve post-casting reserved groove on the concrete arch seat, and fill the hinge seat with micro-expansion concrete;

[0024] Weld the hinged body of the temporary hinged unit of the arch foot, weld the hinged tube, diagonal rod and triangular stiffening plate of the hinged body to the first section of the steel tube arch rib segment, and fill the hinged tube and diagonal rod with micro-expansion concrete;

[0025] Install the arch foot stress monitoring unit, install the stress testing element of the arch foot stress monitoring unit on the first section of the steel pipe arch rib segment, and connect the stress testing element to the stress automatic acquisition instrument through a connecting line;

[0026] Welding the temporary fixing unit of the arch foot, welding and connecting the first anchor seat of the temporary fixing unit of the arch foot to the embedded section of the arch foot, welding and connecting the second anchor seat of the temporary fixing unit of the arch foot to the first section of the steel pipe arch rib segment and setting it corresponding to the first anchor seat;

[0027] Lift the first section of the steel pipe arch rib segment, put the articulated tube into the arc groove of the articulated seat and rotate it with the articulated seat, adjust the anchor cable force of the inclined buckle hanging system to accurately match the first section of the steel pipe arch rib segment, weld the limit plate on the articulated seat, and the limit plate limits the articulated tube in the arc groove to rotate freely;

[0028] Hoist the second steel tube arch rib segment, adjust the cable tension of the inclined stay hook system to accurately match the second steel tube arch rib segment, weld the second steel tube arch rib segment to the first steel tube arch rib segment, and splice them to the Nth steel tube arch rib segment in sequence;

[0029] According to the proposed construction plan and theoretical calculation results, when hoisting the Nth steel tube arch rib segment, the fine-rolled threaded steel is inserted into the holes of the first anchor seat and the second anchor seat, and the first nut and the second nut at both ends of the fine-rolled threaded steel are tightened to constrain the arch foot embedded section and the first steel tube arch rib segment;

[0030] Lift the remaining steel pipe arch rib segments to be installed, adjust the anchor cable force of the inclined stay buckle hanging system to accurately match the remaining steel pipe arch rib segments to be installed, and weld them with the installed steel pipe arch rib segments;

[0031] During the hoisting process of the steel pipe arch rib segment, the arch foot stress monitoring unit monitors the stress state and arch rib linear shape of the first section of the steel pipe arch rib segment in real time. If the stress or arch rib linear shape is not within the target range, the first nut and the second nut at both ends of the fine-rolled threaded steel are loosened for adjustment. After the adjustment is completed, the first nut and the second nut at both ends of the fine-rolled threaded steel are tightened until the steel pipe arch rib is erected to the target cantilever state;

[0032] Adjust the anchor cable force of the inclined stay hook system to adjust the joint mouth to the target state and wait for the joint to be closed. Hoist the joint section and accurately match the joint section with the joint mouths on both sides of the steel pipe arch rib and weld them into a whole.

[0033] Weld the underfilled section between the pre-embedded section of the arch foot and the first section of the steel pipe arch rib section, loosen the first nut and the second nut at both ends of the fine-rolled threaded steel, and remove the fine-rolled threaded steel, the first anchor seat and the second anchor seat;

[0034] The post-cast reserved groove is reserved on the cast concrete arch seat, and the hinged constraint between the embedded section of the arch foot and the first section of the steel tube arch rib is transformed into a permanent steel constraint. The oblique buckle and hanging splicing construction of the steel tube arch rib is completed.

[0035] The beneficial effects of the technical solution provided by this application include:

[0036] The embodiment of the present application provides an arch foot restraint device and method for the oblique buckle hanging and cantilevered construction of steel tube arch ribs. The arch foot restraint device has an arch foot temporary hinge unit and an arch foot temporary fixing unit; the arch foot temporary hinge unit is arranged between the arch foot embedded section and the first section of the steel tube arch rib segment, and the first section of the steel tube arch rib segment is hingedly connected to the arch foot embedded section through the arch foot temporary hinge unit; the arch foot temporary fixing unit is connected between the arch foot embedded section and the first section of the steel tube arch rib segment, and the first section of the steel tube arch rib segment is fixedly connected to the arch foot embedded section through the arch foot temporary fixing unit. During the oblique buckle hanging and cantilevered construction of the steel tube arch ribs, the arch foot embedded section and the first section of the steel tube arch rib segment are restrained by the arch foot temporary hinge unit and the arch foot temporary fixing unit. The arch foot restraint device monitors the stress state of the first section of the steel tube arch rib segment in real time through the arch foot stress monitoring unit.

[0037] Therefore, the arch foot restraint device can temporarily fix and relax the arch foot restraint mode according to the measured stress state of the arch foot and the measured linear shape of the arch rib, as well as the theoretical calculation results, and then adjust the linear shape of the arch rib through the cable force of the inclined cable system. This restraint method can not only ensure the safety and stability of the arch rib structure, but also facilitate the adjustment of the arch rib linear shape, and avoid the generation of adverse bending moments in the arch foot area. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 A schematic diagram of the structure of the arch foot restraint device provided in an embodiment of the present application;

[0040] Figure 2 for Figure 1 Cross-sectional view along CC direction;

[0041] Figure 3 for Figure 1 The cross-sectional view along the BB direction;

[0042] Figure 4 for Figure 1 The cross-sectional view along the AA direction;

[0043] Figure 5 A schematic diagram of the structure of the hinged seat, the pre-embedded arch foot section and the concrete arch seat provided in the embodiment of the present application;

[0044] Figure 6A schematic diagram of the structure of the hinged body, the pre-embedded arch foot section, the first steel tube arch rib section and the concrete arch seat provided in the embodiment of the present application;

[0045] Figure 7 A schematic diagram of the structure of a triangular stiffening plate provided in an embodiment of the present application;

[0046] Figure 8 A schematic diagram of the structure of the first anchor seat provided in an embodiment of the present application;

[0047] Fig. 9 A schematic diagram of the structure of the temporary fixing unit of the arch foot, the pre-embedded section of the arch foot, and the first section of the steel pipe arch rib segment provided in the embodiment of the present application;

[0048] Fig.10 This is a schematic structural diagram of the foot stress monitoring unit, the arch foot embedded section, and the first steel pipe arch rib segment provided in an embodiment of the present application.

[0049] Figure numerals: 1-concrete arch seat, 2-flange, 3-embedded section of arch foot, 4-embedded steel bar, 5-hinge seat, 6-hinge tube, 7-triangular stiffening plate, 8-diagonal rod, 9-vertical rod, 10-first section of steel pipe arch rib segment, 11-temporary fixing unit of arch foot, 12-stress testing element, 13-automatic stress collector, 14-connecting line, 51-arc groove, 52-limiting plate, 71-triangular steel plate, 72-stiffening rib, 111-first anchor seat, 112-second anchor seat, 113-fine-rolled threaded steel, 114-first nut, 115-second nut. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0051] An embodiment of the present application provides an arch foot restraint device for the oblique-pull, buckle-hang and cantilever construction of steel tube arch ribs, which can solve the problems in the prior art that when the steel tube arch ribs are oblique-pull, buckle-hang and cantilevered, the arch foot has insufficient structural stability when a temporary hinged restraint is used, and it is not convenient to adjust the arch rib line shape when a fixed restraint is used, and there is an unfavorable bending moment in the arch foot area.

[0052] See also Figure 1 As shown, the first aspect of the embodiment of the present application provides an arch foot restraint device for the oblique buckle hanging and cantilevered construction of a steel tube arch rib, comprising:

[0053] The temporary hinge unit of the arch foot is arranged between the pre-embedded section 3 of the arch foot and the first section of the steel pipe arch rib segment 10. The first section of the steel pipe arch rib segment 10 is hingedly connected to the pre-embedded section 3 of the arch foot through the temporary hinge unit of the arch foot. The temporary hinge unit of the arch foot temporarily hinges and constrains the pre-embedded section 3 of the arch foot and the first section of the steel pipe arch rib segment 10 as a whole during the construction process of the inclined buckle hanging and splicing of the steel pipe arch rib. The first section of the steel pipe arch rib segment 10 performs rotational movement on the pre-embedded section 3 of the arch foot with the temporary hinge unit of the arch foot as the axis.

[0054] The arch foot temporary fixing unit 11 is connected between the arch foot embedded section 3 and the first section of the steel pipe arch rib segment 10, and the first section of the steel pipe arch rib segment 10 is fixedly connected to the arch foot embedded section 3 through the arch foot temporary fixing unit 11. The arch foot temporary fixing unit 11 temporarily fixes and constrains the arch foot embedded section 3 and the first section of the steel pipe arch rib segment 10 as a whole during the construction process of the steel pipe arch rib inclined buckle hanging cantilever assembly. The first section of the steel pipe arch rib segment 10 is fixedly connected to the arch foot embedded section 3 with the arch foot temporary fixing unit 11 as a connection system. When the arch rib line shape reaches the target state, the arch foot temporary fixing unit 11 is used to lock and release to constrain the arch foot embedded section 3 and the first section of the steel pipe arch rib segment 10, and the arch rib line shape is adjusted by the anchor cable force of the inclined buckle hanging system, so that the steel pipe arch rib line shape meets the design requirements and the arch rib structure is safe and stable.

[0055] The arch foot stress monitoring unit is used to monitor the stress state of the first steel pipe arch rib segment 10 located in the arch foot area.

[0056] How it works

[0057] An embodiment of the present application provides an arch foot restraint device for the obliquely fastened, buckled, and suspended construction of steel tube arch ribs. The arch foot restraint device comprises an arch foot temporary hinge unit and an arch foot temporary fixing unit 11; the arch foot temporary hinge unit is arranged between the arch foot embedded section 3 and the first steel tube arch rib segment 10, and the first steel tube arch rib segment 10 is hingedly connected to the arch foot embedded section 3 through the arch foot temporary hinge unit; the arch foot temporary fixing unit 11 is connected between the arch foot embedded section 3 and the first steel tube arch rib segment 10, and the first steel tube arch rib segment 10 is fixedly connected to the arch foot embedded section 3 through the arch foot temporary fixing unit 11.

[0058] During the construction of the steel tube arch rib inclined buckle hanging cantilever assembly, the arch foot embedded section 3 and the first section of the steel tube arch rib segment 10 are constrained by the arch foot temporary hinge unit and the arch foot temporary fixing unit 11. The arch foot restraint device monitors the stress state of the arch foot area of ​​the first section of the steel tube arch rib segment 10 in real time through the arch foot stress monitoring unit. Therefore, the arch foot restraint device can temporarily fix and relax the arch foot restraint method according to the measured stress state of the arch foot and the measured linear shape of the arch rib, as well as the theoretical calculation results, and then adjust the arch rib linear shape through the cable force of the inclined buckle hanging system. This restraint method can not only ensure the safety and stability of the arch rib structure, but also facilitate the adjustment of the arch rib linear shape, and avoid the generation of adverse bending moments in the arch foot area.

[0059] In some alternative embodiments, see Figure 1 As shown, an embodiment of the present application provides an arch foot restraint device for the oblique buckle hanging and cantilever splicing construction of steel tube arch ribs, the arch foot temporary articulation unit of the arch foot restraint device includes an articulation seat 5 and an articulation body, the articulation seat 5 and the arch foot embedded section 3 are both cast in the concrete arch seat 1 and form an integral body with the concrete arch seat 1, the articulation body is fixedly connected to the first section of the steel tube arch rib segment 10, and the articulation seat 5 and the articulation body are rotatably connected.

[0060] Specifically, see Figure 5 As shown, the bottom of the articulated seat 5 is connected with the embedded steel bar 4, the embedded steel bar 4 is cast in the concrete arch seat 1 and forms an integral body with the concrete arch seat 1, the embedded steel bar 4 is welded to the structural steel bar in the concrete arch seat 1, the articulated seat 5 is welded to the structural steel bar in the concrete arch seat 1 through the embedded steel bar 4, and after the concrete arch seat 1 is cast with concrete, the articulated seat 5 forms an integral body with the concrete arch seat 1.

[0061] The top of the articulated seat 5 is provided with an arc groove 51, which is made of a semicircular steel pipe and is used to be rotatably connected with the articulated tube 6 of the articulated body. Limiting plates 52 are provided at both ends of the arc groove 51, and the limiting plates 52 are provided with positioning grooves for limiting the articulated tube 6 of the articulated body in the arc groove 51. The positioning groove is a semicircular structure, and the inner diameter of the positioning groove is adapted to the outer diameter of the articulated tube 6. The limiting plates 52 are welded to the articulated seat 5, and the limiting plates 52 are used to prevent the articulated tube 6 from escaping from the arc groove 51. The articulated seat 5 is filled with micro-expansive concrete, which is used to increase the compressive strength of the articulated seat 5.

[0062] See also Figure 4 and Figure 6As shown, the hinged body includes a hinged tube 6 and an inclined rod 8. The hinged tube 6 is a cylindrical steel pipe structure. The hinged tube 6 is used to rotate and connect with the arc groove 51 of the hinge seat 5. The outer diameter of the hinged tube 6 matches the inner diameter of the arc groove 51. There are multiple inclined rods 8, and the multiple inclined rods 8 are symmetrically arranged on both sides of the hinged tube 6 in pairs. One end of the inclined rod 8 is welded to the hinged tube 6, and the other end of the inclined rod 8 is welded to the first section of the steel pipe arch rib segment 10 to form a whole. A triangular stiffening plate 7 is welded between the two inclined rods 8 symmetrically arranged along the axis direction of the hinged tube 6. The triangular stiffening plate 7 is used to enhance the structural strength of the two inclined rods 8 symmetrically arranged along the axis direction of the hinged tube 6. After the first section of the steel pipe arch rib segment 10 is accurately matched in place, the hinged tube 6 of the hinged body is placed in the arc groove 51 of the hinge seat 5, and then the limit plate 52 is welded to the hinge seat 5, so as to form a complete temporary hinged unit of the arch foot.

[0063] In some alternative embodiments, see Figure 6 As shown, the embodiment of the present application provides an arch foot restraint device for the oblique pull-and-hook hanging construction of a steel tube arch rib, wherein the hinged tube 6 and the inclined rod 8 of the arch foot restraint device are both cylindrical tube structures, and the hinged tube 6 and the inclined rod 8 are both filled with micro-expansive concrete. The micro-expansive concrete in the hinged tube 6 is used to enhance the compressive strength of the hinged tube 6, and the micro-expansive concrete in the inclined rod 8 is used to enhance the compressive strength of the inclined rod 8.

[0064] See also Figure 7 As shown, the triangular stiffening plate 7 includes a triangular steel plate 71 and stiffening ribs 72 . The triangular steel plate 71 is an isosceles right-angled steel plate. A plurality of stiffening ribs 72 are vertically welded on both sides of the triangular steel plate 71 . The stiffening ribs 72 are used to enhance the compressive resistance of the triangular steel plate 71 .

[0065] See also Figures 1 to 3 As shown, the first steel tube arch rib segment 10 includes four first chords arranged in a matrix, the four first chords are parallel to each other and spaced apart, and two adjacent first chords are welded and connected by a vertical rod 9. The arch foot embedded section 3 includes four second chords arranged in a matrix, the four second chords are parallel to each other and spaced apart, the first chords and the second chords are both cylindrical steel tube structures, and the four first chords correspond to the four second chords. A flange 2 is welded at the bottom of the arch foot embedded section 3, the flange 2 is cast in the concrete arch seat 1 and forms an integral body with the concrete arch seat 1, the flange 2 is welded and connected to the structural steel bars in the concrete arch seat 1, the flange 2 provides positioning for the arch foot embedded section 3, and reduces the local pressure of the concrete arch seat 1, thereby improving the compressive strength of the concrete arch seat 1.

[0066] In some alternative embodiments, see Figure 1 , Figure 2 , Figure 8 and Fig. 9As shown, the embodiment of the present application provides an arch foot restraint device for the oblique buckle hanging and splicing construction of steel pipe arch ribs, and the arch foot temporary fixing unit 11 of the arch foot restraint device includes a first anchor seat 111, a second anchor seat 112 and a fine-rolled threaded steel bar 113. There are multiple first anchor seats 111, and the multiple first anchor seats 111 are welded and connected to the second chord rod of the arch foot embedded section 3. There are multiple second anchor seats 112, and the multiple second anchor seats 112 are welded and connected to the first chord rod of the first section of the steel pipe arch rib segment 10 and are arranged corresponding to the first anchor seat 111. The first anchor seat 111 and the second anchor seat 112 are fixedly connected by the fine-rolled threaded steel bar 113, and the structures of the first anchor seat 111 and the second anchor seat 112 are the same.

[0067] The first nut 114 and the second nut 115 are threadedly connected at both ends of the fine-rolled threaded steel bar 113. The first nut 114 and the second nut 115 at one end of the fine-rolled threaded steel bar 113 are located on both sides of the first anchor seat 111, and the first nut 114 and the second nut 115 at the other end of the fine-rolled threaded steel bar 113 are located on both sides of the second anchor seat 112. After the first section of the steel pipe arch rib segment 10 and the arch foot embedded section 3 are accurately matched in place, the fine-rolled threaded steel bar 113 is inserted into the holes of the first anchor seat 111 and the second anchor seat 112, and the first nut 114 and the second nut 115 are tightened. The first nut 114 is used to shorten the distance between the first section of the steel pipe arch rib segment 10 and the arch foot embedded section 3, and the second nut 115 is used to increase the distance between the first section of the steel pipe arch rib segment 10 and the arch foot embedded section 3. The arch foot temporary fixing unit is formed by tightening the first nut 114 and the second nut 115.

[0068] In some alternative embodiments, see Figure 1 , Figure 3 and Fig.10 As shown, the embodiment of the present application provides an arch foot restraint device for the oblique buckle hanging and splicing construction of steel pipe arch ribs. The arch foot stress monitoring unit of the arch foot restraint device includes a stress test element 12 and a stress automatic collector 13. The stress test element 12 is connected to the stress automatic collector 13 through a connecting line 14. The stress test element 12 is installed on the first chord of the first section of the steel pipe arch rib segment 10 connected to the arch foot embedded section 3. The stress test element 12 is located on the first chord and close to the side of the arch foot embedded section 3. The stress automatic collector 13 collects the stress state of the first section of the steel pipe arch rib segment 10 in real time through the stress test element 12. The stress test element 12 is preferably, but not limited to, a vibrating wire strain gauge. The stress automatic collector 13 is provided with an automatic collection module and a data storage device. The stress automatic collector 13 is provided with a wireless transceiver module. The stress automatic collector 13 can be remotely operated and monitored through the wireless transceiver module.

[0069] See also Figures 1 to 10As shown, the second aspect of the embodiment of the present application provides a method for an arch foot restraint device for the oblique buckle hanging and cantilevered construction of a steel pipe arch rib, the method comprising the following steps:

[0070] Step 1, tie up the structural steel bars of the concrete arch seat 1, accurately locate the embedded section 3 of the arch foot, and weld the flange 2 at the bottom of the embedded section 3 of the arch foot to the structural steel bars; accurately locate the hinge seat 5 of the temporary hinge unit of the arch foot, and weld the embedded steel bars 4 at the bottom of the hinge seat 5 to the structural steel bars.

[0071] Step 2, pouring the concrete arch seat 1, burying the arch foot embedded section 3, the embedded steel bars 4, and the hinge seat 5 of the temporary hinged unit of the arch foot into the concrete arch seat 1 to form a whole, reserving a post-cast reserved groove on the concrete arch seat 1, filling the hinge seat 5 with micro-expansion concrete, and enhancing the compression resistance of the hinge seat 5.

[0072] Step 3, welding the hinged body of the temporary hinged unit at the arch foot, weld the hinged tube 6, diagonal rod 8 and triangular stiffening plate 7 of the hinged body at the arch foot of the first steel pipe arch rib segment 10 at the construction site or in the steel structure prefabrication plant, and fill the hinged tube 6 and diagonal rod 8 with micro-expansive concrete to enhance the compressive resistance of the hinged tube 6 and diagonal rod 8.

[0073] Step 4: Install the arch foot stress monitoring unit. Install the stress testing element 12 of the arch foot stress monitoring unit on the first steel pipe arch rib segment 10 . The stress testing element 12 is connected to the stress automatic acquisition device 13 via a connecting line 14 .

[0074] Step 5, welding the arch foot temporary fixing unit 11, welding the first anchor seat 111 of the arch foot temporary fixing unit 11 to the arch foot embedded section 3, welding the second anchor seat 112 of the arch foot temporary fixing unit to the first steel pipe arch rib segment 10 and setting it corresponding to the first anchor seat 111.

[0075] Step 6, use an aerial cable crane to hoist the first section of the steel pipe arch rib segment 10, put the articulated tube 6 into the arc groove 51 of the articulated seat 5 and rotatably connect it with the articulated seat 5, adjust the anchor cable force of the inclined-stayed hook system to accurately match the first section of the steel pipe arch rib segment 10, weld the limit plate 52 to the articulated seat 5, and the limit plate 52 limits the articulated tube 6 in the arc groove 51 for free rotation to form a temporary articulated unit of the arch foot.

[0076] Step 7, use an aerial cable crane to hoist the second steel tube arch rib segment, adjust the cable tension of the inclined cable system to accurately match the second steel tube arch rib segment, weld the second steel tube arch rib segment to the first steel tube arch rib segment 10, and splice them in a cycle to the Nth steel tube arch rib segment.

[0077] Step 8. According to the proposed construction plan and theoretical calculation results, when hoisting the Nth steel pipe arch rib segment, the high-quality rolled threaded steel 113 is inserted into the holes of the first anchor seat 111 and the second anchor seat 112, and the first nut 114 and the second nut 115 at both ends of the high-quality rolled threaded steel 113 are tightened to form a temporary fixing unit 11 of the arch foot to constrain the embedded section 3 of the arch foot and the first steel pipe arch rib segment 10.

[0078] Step 9: Use the aerial cable crane to continue hoisting the remaining steel pipe arch rib segments to be installed, adjust the cable tension of the inclined cable-stayed hanging system to accurately match the remaining steel pipe arch rib segments to be installed, and weld them to the installed steel pipe arch rib segments.

[0079] Step 10. During the hoisting process of the steel pipe arch rib segment, the arch foot stress monitoring unit monitors the stress state and arch rib linear shape of the first steel pipe arch rib segment 10 in real time. If the stress level is high or the deviation between the measured linear shape of the arch rib and the theoretical linear shape is too large, the first nut 114 and the second nut 115 at both ends of the fine-rolled threaded steel 113 can be loosened for adjustment. After the adjustment, the first nut 114 and the second nut 115 at both ends of the fine-rolled threaded steel 113 are tightened until the steel pipe arch rib is erected to the target cantilever state.

[0080] Step 11, adjust the cable tension of the cable anchor of the inclined stay system to adjust the joint mouth to the target state and wait for the joint to be closed. Use the aerial cable crane to hoist the joint section and accurately match the joint section with the joint mouths on both sides of the steel pipe arch rib and then weld them into a whole.

[0081] Step 12, weld the underfilled section between the arch foot embedded section 3 and the first steel pipe arch rib section 10, loosen the first nut 114 and the second nut 115 at both ends of the finely rolled threaded steel 113, and remove the finely rolled threaded steel 113, the first anchor seat 111 and the second anchor seat 112.

[0082] Step 13, pour the post-cast reserved groove reserved on the concrete arch seat 1, convert the hinged constraint between the arch foot embedded section 3 and the first steel tube arch rib segment 10 into a permanent steel constraint, and complete the system conversion of the steel tube arch rib from a hinged arch system to a hingeless arch system, and complete the construction of the steel tube arch rib oblique buckle hanging splicing.

[0083] This application has been successfully used in the Nanpu River Bridge in the third section of the Wencheng to Taishun (Zhejiang-Fujian border) highway in Zhejiang Province. The main bridge of the Nanpu River Bridge is a top-supported steel tube concrete arch bridge with a main span of 258 meters.

[0084] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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 application 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 a limitation on the present application. 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0085] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0086] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. An arch foot restraint device for the oblique buckle hanging and splicing construction of steel pipe arch ribs, characterized in that: include: An arch foot temporary hinge unit, the arch foot temporary hinge unit being arranged between the arch foot embedded section (3) and the first steel pipe arch rib section (10), the first steel pipe arch rib section (10) being hingedly connected to the arch foot embedded section (3) via the arch foot temporary hinge unit; An arch foot temporary fixing unit (11), the arch foot temporary fixing unit (11) being connected between the arch foot embedded section (3) and the first steel pipe arch rib segment (10), the first steel pipe arch rib segment (10) being fixedly connected to the arch foot embedded section (3) via the arch foot temporary fixing unit; An arch foot stress monitoring unit, the arch foot stress monitoring unit is used to monitor the stress state of the first steel pipe arch rib segment (10); The arch foot temporary fixing unit (11) comprises a first anchor seat (111), a second anchor seat (112) and a fine-rolled threaded steel bar (113); the first anchor seat (111) is welded to the arch foot embedded section (3); the second anchor seat (112) is welded to the first section steel pipe arch rib segment (10) and is arranged corresponding to the first anchor seat (111); the first anchor seat (111) and the second anchor seat (112) are fixedly connected via the fine-rolled threaded steel bar (113); Both ends of the finished rolled threaded steel (113) are threadedly connected with a first nut (114) and a second nut (115); the first nut (114) and the second nut (115) at one end of the finished rolled threaded steel (113) are located on both sides of the first anchor seat (111); and the first nut (114) and the second nut (115) at the other end of the finished rolled threaded steel (113) are located on both sides of the second anchor seat (112).

2. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever construction as claimed in claim 1, characterized in that: The temporary hinged unit for the arch foot comprises a hinged seat (5) and a hinged body. The hinged seat (5) and the embedded section (3) of the arch foot are cast in the concrete arch seat (1) and form an integral body with the concrete arch seat (1). The hinged body is fixedly connected to the first section of the steel pipe arch rib segment (10). The hinged seat (5) and the hinged body are rotatably connected.

3. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever splicing construction as claimed in claim 2, characterized in that: The bottom of the hinge seat (5) is connected to an embedded steel bar (4), the embedded steel bar (4) is cast in the concrete arch seat (1) and forms an integral body with the concrete arch seat (1), the embedded steel bar (4) is welded to the structural steel bar in the concrete arch seat (1), the top of the hinge seat (5) is provided with an arc groove (51), the arc groove (51) is used to be rotatably connected to the hinge body, the two ends of the arc groove (51) are provided with a limiting plate (52), the limiting plate (52) is provided with a positioning groove for limiting the hinge body in the arc groove (51), the limiting plate (52) is welded to the hinge seat (5), and the hinge seat (5) is filled with micro-expansion concrete.

4. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever construction as claimed in claim 2, characterized in that: The hinged body comprises a hinged tube (6) and an inclined rod (8), wherein the hinged tube (6) is used for being rotatably connected to the hinged seat (5), and a plurality of inclined rods (8) are provided, and the plurality of inclined rods (8) are symmetrically arranged in pairs on both sides of the hinged tube (6), one end of the inclined rod (8) is welded to the hinged tube (6), and the other end of the inclined rod (8) is welded to the first section of the steel pipe arch rib segment (10), and a triangular stiffening plate (7) is welded between the two inclined rods (8) symmetrically arranged along the axial direction of the hinged tube (6).

5. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever construction as claimed in claim 4, characterized in that: The hinged tube (6) and the diagonal rod (8) are both cylindrical tube structures, and are filled with micro-expansive concrete. The triangular stiffening plate (7) comprises a triangular steel plate (71) and stiffening ribs (72). The triangular steel plate (71) is an isosceles right-angled steel plate, and a plurality of stiffening ribs (72) are provided. The plurality of stiffening ribs (72) are vertically welded to two sides of the triangular steel plate (71).

6. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever splicing construction as claimed in claim 2, characterized in that: A flange (2) is welded to the bottom of the pre-embedded section (3) of the arch foot. The flange (2) is cast in the concrete arch seat (1) and forms an integral body with the concrete arch seat (1). The flange (2) is welded to the structural steel bars in the concrete arch seat (1).

7. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever construction as claimed in claim 1, characterized in that: The arch foot stress monitoring unit comprises a stress testing element (12) and an automatic stress collector (13); the stress testing element (12) is connected to the automatic stress collector (13) via a connecting line (14); the stress testing element (12) is installed on one side of a first steel pipe arch rib segment (10) connected to the arch foot embedded section (3); and the automatic stress collector (13) collects the stress state of the first steel pipe arch rib segment (10) in real time via the stress testing element (12).

8. The arch foot restraint device for the steel tube arch rib oblique buckle hanging and cantilever splicing construction as claimed in claim 7, characterized in that: The stress testing element (12) is a vibrating-wire strain gauge, the automatic stress acquisition instrument (13) is provided with an automatic acquisition module and a data storage device, the automatic stress acquisition instrument (13) is provided with a wireless transceiver module, and the automatic stress acquisition instrument (13) is remotely operated and monitored via the wireless transceiver module.

9. A method for an arch foot restraint device for steel tube arch rib oblique buckle hanging and cantilever construction as claimed in any one of claims 1 to 8, characterized in that: The method comprises the following steps: Tie up the structural steel bars of the concrete arch seat (1), accurately locate the pre-embedded section (3) of the arch foot, weld the flange (2) at the bottom of the pre-embedded section (3) of the arch foot to the structural steel bars, accurately locate the hinge seat (5) of the temporary hinge unit of the arch foot, and weld the pre-embedded steel bars (4) at the bottom of the hinge seat (5) to the structural steel bars; Casting a concrete arch seat (1), reserving a post-casting reserved groove on the concrete arch seat (1), and filling the hinge seat (5) with micro-expansion concrete; Weld the hinged body of the temporary hinged unit of the arch foot, weld the hinged tube (6), the diagonal rod (8) and the triangular stiffening plate (7) of the hinged body to the first section of the steel pipe arch rib segment (10), and fill the hinged tube (6) and the diagonal rod (8) with micro-expansion concrete; Installing an arch foot stress monitoring unit, installing a stress testing element (12) of the arch foot stress monitoring unit on the first steel pipe arch rib segment (10), and connecting the stress testing element (12) to an automatic stress acquisition device (13) via a connecting line (14); Welding the arch foot temporary fixing unit (11), welding the first anchor seat (111) of the arch foot temporary fixing unit (11) to the arch foot embedded section (3), welding the second anchor seat (112) of the arch foot temporary fixing unit (11) to the first steel pipe arch rib segment (10) and correspondingly arranging the second anchor seat (111); The first section of the steel pipe arch rib segment (10) is hoisted, the hinge tube (6) is placed in the arc groove (51) of the hinge seat (5) and is rotatably connected to the hinge seat (5), the anchor cable force of the inclined buckle hanging system is adjusted to accurately match the first section of the steel pipe arch rib segment (10), and the limit plate (52) is welded to the hinge seat (5), and the limit plate (52) limits the hinge tube (6) in the arc groove (51) to rotate freely; Hoisting the second steel tube arch rib segment, adjusting the anchor cable force of the inclined stay hook system to accurately match the second steel tube arch rib segment, welding the second steel tube arch rib segment to the first steel tube arch rib segment (10), and splicing them in sequence to the Nth steel tube arch rib segment; According to the proposed construction plan and theoretical calculation results, when hoisting the Nth steel pipe arch rib segment, the finely rolled threaded steel bar (113) is inserted into the holes of the first anchor seat (111) and the second anchor seat (112), and the first nut (114) and the second nut (115) at both ends of the finely rolled threaded steel bar (113) are tightened to constrain the arch foot embedded section (3) and the first steel pipe arch rib segment (10); Lift the remaining steel pipe arch rib segments to be installed, adjust the anchor cable force of the inclined stay buckle hanging system to accurately match the remaining steel pipe arch rib segments to be installed, and weld them with the installed steel pipe arch rib segments; During the hoisting process of the steel pipe arch rib segment, the arch foot stress monitoring unit monitors the stress state and arch rib linear shape of the first steel pipe arch rib segment (10) in real time. If the stress or arch rib linear shape is not within the target range, the first nut (114) and the second nut (115) at both ends of the fine-rolled threaded steel (113) are loosened for adjustment. After the adjustment is completed, the first nut (114) and the second nut (115) at both ends of the fine-rolled threaded steel (113) are tightened until the steel pipe arch rib is erected to the target cantilever state. Adjust the anchor cable force of the inclined stay hook system to adjust the joint mouth to the target state and wait for the joint to be closed. Hoist the joint section and accurately match the joint section with the joint mouths on both sides of the steel pipe arch rib and weld them into a whole. Welding the underfilled section between the arch foot embedded section (3) and the first steel pipe arch rib section (10), loosening the first nut (114) and the second nut (115) at both ends of the finely rolled threaded steel (113), and removing the finely rolled threaded steel (113), the first anchor seat (111) and the second anchor seat (112); The post-cast reserved groove reserved on the cast concrete arch seat (1) is converted into a permanent steel constraint between the arch foot embedded section (3) and the first steel tube arch rib section (10), and the steel tube arch rib oblique buckle hanging and splicing construction is completed.

Images