A steel tube lattice pier for bridge pier and bridge repair work and a construction method thereof

Abstract

The present invention provides a steel tube lattice pier for bridge pier and bridge repair work and a construction method thereof, including a cap arranged on both sides of the inclined bridge pier, the cap serving as an anchor point of the steel tube lattice pier, which is composed of a plurality of vertically arranged steel tube piles and a horizontally arranged connecting beam, concrete is poured inside and outside the cap to form a concrete pile foundation, and the cross-sectional shapes of the caps on the left and right sides are different according to the on-site construction environment, the tops of the caps on both sides are vertically arranged with a plurality of steel columns, the adjacent steel columns are connected in the horizontal direction by a plurality of horizontal struts, the horizontal struts of different heights are connected by diagonal struts, the tops of the steel columns on both sides are connected by a plurality of beams at different heights, and the two beams of different heights on the same side are connected and fixed by diagonal struts. The steel tube lattice pier in the technical solution bears the temporary support function of the bridge body, and the structure is reliable and reasonable. At the same time, the construction method of the steel tube lattice pier is applicable to a wide range of environments and saves construction time.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge and road repair, and more particularly, to a steel pipe lattice pier for pier and bridge repair operations and a construction method thereof. Background Art

[0002] With the rapid development of bridge construction in China, bridge diseases frequently occur during the construction and use of bridges. The disposal of bridge diseases has become increasingly prominent. For example, due to uneven earthwork loading, water pressure, earthquake or other reasons, the displacement, fracture and damage of bridge pile foundations lead to a large tilt of the lower and upper structures of the bridge, posing a major safety hazard to the bridge and seriously affecting the safe use of the bridge. It is necessary to carry out necessary disposal on the bridge before it can be restored to a normal safe use state.

[0003] Our company has conducted in-depth research on such pier tilt situations and proposed a construction method of first setting anti-wind stabilizing cables to stabilize the tilted pier and then carrying out disease disposal. Through the practice of the emergency rescue, danger elimination and restoration and reconstruction project of Pier 5# on the B ramp of Hongba Interchange on the East Link Road of Yibin New Airport (hereinafter referred to as the Yibin New Airport project), it is considered that this method is relatively safe, reliable, economical and applicable, and is worthy of application and promotion in the disposal of the same type of bridge diseases. When constructing this repair plan, it is necessary to build a steel pipe lattice pier as a temporary pier to replace the tilted pier to achieve the support function and maintain the stability of the bridge main body. How to build a steel pipe lattice pier suitable for the actual construction environment on the premise of ensuring structural stability and reliability has become the primary problem to be considered at present. Summary of the Invention

[0004] The purpose of the present invention is to provide a steel pipe lattice pier for pier and bridge repair operations and a construction method thereof. For the construction repair of tilted piers, the steel pipe lattice pier plays a temporary supporting role for the bridge main body, with a reliable and reasonable structure. At the same time, the construction method of the steel pipe lattice pier has a wide range of applicable environments, stable and reliable quality, and saves construction time.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A steel pipe lattice pier for pier and bridge repair operations, the steel pipe lattice pier has an overall U-shaped structure, including bearing platforms arranged on both sides of the tilted pier. The bearing platforms serve as the anchor points of the steel pipe lattice pier and are composed of multiple vertically arranged steel pipe piles and a horizontally arranged connecting beam I. Concrete is poured inside and outside the bearing platforms to form concrete pile foundations, and the cross-sectional shapes of the bearing platforms on the left and right sides are different according to the on-site construction environment;

[0007] There are multiple steel columns vertically set at the top of the pedestals on both sides. The adjacent steel columns are connected in the horizontal direction by multiple horizontal struts. The horizontal struts of different heights are connected by diagonal struts. The tops of the steel columns on both sides are connected by multiple beams at different heights. The two beams of different heights on the same side are connected and fixed by diagonal struts.

[0008] Furthermore, a connecting beam 1 is arranged on the top surface of the steel pipe pile, and a plurality of connecting beams 1 connect a plurality of discretely arranged steel pipe piles into a whole.

[0009] Furthermore, when the distance between two discretely arranged steel pipe piles is greater than or equal to 6 meters, a second connecting beam is added between the top ends of the two piles for reinforcement.

[0010] Furthermore, the first connecting beam and the second connecting beam are both I-beams.

[0011] Furthermore, among the supporting platforms on the left and right sides, the cross section of the supporting platform on one side is rectangular, and the cross section of the supporting platform on the other side is trapezoidal.

[0012] Furthermore, the top and bottom layers of the pedestal are embedded with double-layer steel mesh.

[0013] Furthermore, a steel plate is embedded in the top layer of the pedestal, and multiple bolts are embedded in the steel plate, and the positions of the bolts correspond to the steel columns one by one.

[0014] Furthermore, the steel column adopts a segmented structure, including a column base segment and multiple standard segments.

[0015] A method for constructing a steel tube lattice pier for bridge pier and bridge repair operations is provided, and is used to construct the above-mentioned steel tube lattice pier. The construction method specifically comprises the following steps:

[0016] S1. Determine the positions of the caps on both sides according to the positions of the inclined piers, and then use a crane to transport the steel pipe piles to the designated locations;

[0017] S2. Place the steel pipe piles on the construction ground according to the planned location and then drive them into the bedrock surface using a vibratory hammer;

[0018] S3. After confirming that the steel pipe piles are inserted to an appropriate depth, adjacent steel pipe piles are connected and fixed using a connecting beam 1;

[0019] S4. When the distance between adjacent steel pipe piles is large, add a second connecting beam at the top of the two for reinforcement;

[0020] S5. The top and bottom layers of the steel pipe pile are both covered with steel mesh, and a steel plate is embedded in the top layer. Bolts are pre-embedded in the steel plate, and then concrete is poured to form a concrete pile foundation.

[0021] S6. Erect steel columns at the positions of the alignment bolts, and connect the adjacent steel columns horizontally through horizontal braces. The different-level horizontal braces are connected and fixed through diagonal braces.

[0022] S7. The tops of the steel columns on both sides are connected by multiple crossbeams at different heights, and the two crossbeams on the same side are connected and fixed through diagonal columns.

[0023] S8. After the steel pipe lattice pier is erected, its overall structure is in a U-shaped structure, and the inclined pier is located in the middle of the steel pipe lattice pier.

[0024] Furthermore, in the step S5, new "L"-shaped 25 steel bars are welded through the steel plate to increase the stability of its connection with the steel pipe pile.

[0025] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0026] The present invention is specially designed for the new repair method of the inclined pier, which plays a temporary role in supporting the pier. The structure is reasonable, taking into account various problems in the construction process. While ensuring stability, the structure is simplified as much as possible, which is conducive to installation and disassembly. Moreover, according to different bridges and construction environments, the size and composition of the steel pipe lattice pier can be flexibly changed, and the support strength is relatively high, meeting the actual construction use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following will briefly introduce the drawings required for the embodiment. It should be understood that the following drawings only show some embodiments of the present invention, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0028] Figure 1 It is the overall structure diagram of the steel pipe lattice pier and the inclined pier in the present invention;

[0029] Figure 2 It is the front view of the steel pipe lattice pier and the inclined pier in the present invention;

[0030] Figure 3 It is the cross-sectional view of the two side bearing platforms of the steel pipe lattice pier in the present invention;

[0031] Figure 4 It is the construction flow chart of the steel pipe lattice pier in the present invention.

[0032] Icon: 1. Inclined pier; 2. Concrete pile foundation; 21. Steel pipe pile; 22. Connecting beam 1; 23. Connecting beam 2; 3. Steel column; 31. Horizontal brace; 32. Diagonal brace; 4. Crossbeam; 41. Diagonal column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0034] 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 as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0035] Example

[0036] The steel tube lattice piers in this technical solution are mainly used when the piers supporting the main body of the bridge are slowly tilted and moved. Traditional solutions generally use the method of building a new one after blasting or demolishing the upper and lower parts of the tilted pier 1. However, both methods have more or less disadvantages:

[0037] If blasting is used, the social impact will be significant due to the long construction period, long road closures, and complete inaccessibility of vehicles. Furthermore, if the blasting is unsuccessful, the bridge support system may become even more vulnerable or cause a chain reaction of tilting of adjacent piers, posing a significant safety risk.

[0038] If the method of removing both the upper and lower parts of the inclined pier 1 is adopted, the social impact will be huge due to the long construction period, long road closure time, and complete inability of vehicles to pass. In terms of safety, the bridge support system may approach a critical equilibrium state. Under the action of a small external force, the bridge may collapse and cause casualties during the hazard removal construction process, which is extremely risky.

[0039] Therefore, both of the above two methods have great limitations. Based on in-depth thinking and research on the above problems, and through the practice of the emergency rescue, danger elimination and restoration and reconstruction project of Pier 5# of Ramp B of Hongba Interchange on the East Connecting Line of Yibin New Airport (hereinafter referred to as the Yibin New Airport Project), it is considered that this scheme is relatively safe, reliable, economical and applicable, and is worthy of application and promotion in the treatment of bridge diseases of the same type. This construction method can be applied to the situation where the bridge pile foundation is displaced, fractured or damaged, resulting in a large tilt of the lower and upper structures of the bridge and still in slow displacement. Without suspending the bridge traffic operation, the original bridge pier and pile foundation are traction-limited. At the same time, a steel pipe lattice pier is set near the inclined pier 1, and the weight pressing on the inclined pier 1 is transferred to the steel pipe lattice pier through the transfer of the force system. The steel pipe lattice pier briefly performs the supporting role of the pier. Then, after the repair of the new pier is completed, the force system is transferred again, and the new pier replaces the steel pipe lattice pier. Then the steel pipe lattice pier is demolished to complete the treatment of the entire bridge disease.

[0040] As Figure 1 and Figure 2 shown, a steel pipe lattice pier for pier and bridge repair operations, the steel pipe lattice pier is integrally in a U-shaped structure, and lattice pier displacement monitoring points are set around the steel pipe lattice pier to continuously monitor the steel pipe lattice pier, and determine whether to continue construction according to the deformation value of the steel pipe lattice pier.

[0041] The steel pipe lattice pier includes bearing platforms arranged on both sides of the inclined pier 1. The bearing platforms serve as the anchor points of the steel pipe lattice pier and provide stable fulcrums for it. Steel columns 3 are arranged above the bearing platforms. The steel columns 3 adopt a segmented structure, including column foot segments and multiple standard segments. The steel columns 3 on both sides are connected by cross beams 4. The cross beams 4 are erected under the bridge main body. After the inclined pier 1 is demolished, the cross beams 4, steel columns 3 and bearing platforms bear the temporary bridge support role. After the construction of the new pier is completed, the support force system is transferred to the new pier, and the steel pipe lattice pier is demolished.

[0042] As Figure 1 and Figure 2 shown, the bearing platform consists of six steel pipe piles 21 arranged vertically and a connecting beam one 22 arranged horizontally. The steel pipe piles 21 are welded and fixed with the connecting beam one 22. The connecting beam one 22 is arranged on the top surface of the steel pipe piles. Multiple connecting beam ones 22 connect the six discrete steel pipe piles 21 into a whole. And when the distance between two discrete steel pipe piles 21 is greater than or equal to 6 meters, a connecting beam two 23 is added between their tops for reinforcement, so as to improve the punching resistance of the bearing platform. Both the connecting beam one 22 and the connecting beam two 23 are I-shaped steel. Concrete is poured inside and outside the steel pipe piles 21, the connecting beam one 22 and the connecting beam two 23 to form a concrete pile foundation 2.

[0043] In the Yibin New Airport project, connecting beam 1 22 uses model 22b I-beam, and connecting beam 2 2 uses model 345b I-beam.

[0044] like Figure 3 As shown, during the entire repair process of the inclined bridge pier 1, the bottom of the inclined bridge pier 1 needs to be tied with a stabilizing cable. Due to the limitation of the stabilizing cable at the bottom of the pier and the load requirements of the upper beam, the cross-section of the left and right piers is rectangular, and the cross-section of the other pier is trapezoidal. The cross-sectional dimensions of the left pier are 902*681*150cm, and the cross-sectional dimensions of the right pier are (1243+878)*654*150cm.

[0045] In the Yibin New Airport project, in order to reduce construction disturbance and save construction time, the spacing between the six steel pipe piles 21 along the transverse direction of the bridge is 4.5m, and the spacing between the steel pipe piles 21 along the longitudinal direction of the bridge is 3.5m. The specifications of the steel pipe piles 21 are Φ1220*11mm. During construction, a 120-type vibratory hammer is used to drive into the bedrock surface. The penetration rate of the steel pipe piles 21 is less than 5mm / min, which confirms that they are inserted in place.

[0046] In the Yibin New Airport project, steel mesh is laid on the top and bottom layers of the pedestal. The steel bars are all double-layer Φ20 steel mesh. The steel bar (mesh) spacing is 15*15cm, and the tension bar spacing is 30cm, that is, one steel bar is installed every other steel bar. In order to enhance the strength of the pedestal, no less than 3 steel bars in the bottom layer of the pedestal pass through the steel pipe piles 21, and the remaining steel bars are adjusted to avoid them. A 3cm thick steel plate and multiple bolts are also embedded in the top layer of the pedestal. The positions of the bolts and steel columns 3 correspond one to one. Newly welded "L"-shaped 25 steel bars are passed through the steel plate to increase the stability of its connection with the steel pipe piles 21.

[0047] In this technical solution, six steel columns 3 are vertically arranged at the top of the pedestals on both sides. Adjacent steel columns 3 are connected in the horizontal direction by multiple horizontal struts 31. The horizontal struts 31 of different heights are connected by diagonal struts 32. The steel columns 3, horizontal struts 31 and diagonal struts 32 are all fixed by welding. The tops of the steel columns 3 on both sides are connected by multiple cross beams 4 at different heights. The two cross beams 4 of different heights on the same side are connected and fixed by diagonal struts 41. The steel columns 3 adopt a segmented structure, including a column base section and multiple standard sections. The multiple standard sections are spliced ​​and assembled from at least the top according to the required height, so that the steel tube lattice pier reaches a predetermined height.

[0048] In the Yibin New Airport project, after the construction of the pier was completed, six φ800×16mm steel columns 3 were installed on the top surfaces of the piers on both sides. The center distance between the piers on both sides was 22.5m, the net distance was 17.2m, and the predetermined height of the steel tube lattice pier was 39.785m. In this project, a single steel column 3 was composed of three standard sections plus a column base section. Each standard section was 12m high, which simplified the transportation and installation of the steel column 3. According to the actual height of the steel tube lattice pier, the corresponding number of steel columns 3 were assembled from bottom to top by welding.

[0049] In this project, in order to increase the overall strength of the steel tube lattice pier, multiple cross beams 4 are installed between the steel columns 3 on the left and right sides. The multiple cross beams 4 are arranged in a high and low order. In order to reduce the deflection of the top cross beam 4 when the supporting force system is converted and the beam body is lifted, diagonal bracing columns 41 are welded and fixed between the upper and lower layers of cross beams 4. The cross beams are made of Q345 steel, and the remaining components are made of Q235 steel. While ensuring stability, the structure of this steel tube lattice pier is simplified as much as possible to facilitate installation and disassembly. In addition, the size and composition of the steel tube lattice pier can be flexibly changed according to different bridges and construction environments. The support strength is high and meets the actual construction and use needs.

[0050] like Figure 4 As shown, a method for constructing a steel tube lattice pier for bridge pier and bridge repair operations is used to construct the above-mentioned steel tube lattice pier, and the construction method specifically includes the following steps:

[0051] The positions of the caps on both sides are determined according to the position of the inclined pier 1. The caps are predetermined to be placed on both sides of the bridge road. Then, the steel pipe piles 21 are transported to the designated positions by a crane. After the steel pipe piles 21 are placed on the construction ground according to the planned position, a 120-type vibratory hammer is used to drive them into the bedrock surface. If the penetration rate of the steel pipe piles 21 is less than 5 mm / min, it is determined that the steel pipe piles 21 are properly driven. After determining that the insertion depth of the steel pipe piles 21 is appropriate, the adjacent steel pipe piles 21 are connected and fixed by connecting beams 1 22. When the distance between adjacent steel pipe piles 21 is large, such as greater than or equal to 6 m, connecting beams 23 are added at the tops of the two for reinforcement.

[0052] Before pouring concrete, steel mesh is laid on the top and bottom layers of the steel pipe pile 21, and a steel plate is embedded in the top layer with pre-embedded bolts. In addition, new "L"-shaped steel bars 25 are welded on the steel plate to increase the stability of its connection with the steel pipe pile 21. After that, concrete can be poured to form the concrete pile foundation 2. Steel columns 3 are erected at the positions of the bolts. Adjacent steel columns 3 are connected horizontally by horizontal braces 31, and horizontal braces 31 of different heights are connected and fixed by diagonal braces 32.

[0053] The tops of the steel columns 3 on both sides are connected by multiple cross beams 4 at different heights. Two cross beams 4 on the same side are connected and fixed by diagonal bracing columns 41. When the steel pipe lattice pier is erected, its overall structure is in a U-shaped structure. The inclined pier 1 is located in the middle of the steel pipe lattice pier. At this time, the conversion of the bridge support system can be carried out;

[0054] When the concrete strength of the newly built pier cap and bearing pad of the bridge reaches the design strength, the restoration of the structural support system can be carried out. After the restoration of the structural support system, the support effect of the steel pipe lattice pier on the beam-slab structure can be released, and the steel pipe lattice pier can be demolished. The demolition procedure is reverse to the installation procedure, and the demolition should be carried out in the order of from top to bottom, first install and then demolish, and demolish the later-installed parts first.至此整个病害处理工作结束。

[0055] During the construction of this plan, traffic control should be carried out on the bridge deck:

[0056] During the erection of the steel pipe lattice pier, traffic control for one-way single-lane traffic in half of the bridge construction area is carried out first. Before the conversion of the original structural support system, temporary traffic control for closing the bridge is required. After the force system conversion is completed, continue with one-way single-lane traffic control. During the one-way single-lane traffic period, according to the design and expert requirements, the traffic lane should be staggered from the position of the construction pier column under the bridge and shall not overlap.

[0057] At the same time, to further avoid the impact of vehicles on the bridge during traffic control on the construction under the bridge, the speed of the vehicles passing on the bridge needs to be limited, the control distance should be extended, and the high-speed public security department is also required to carry out strong reminder speed limit control at both ends of the control area.

[0058] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A steel tube lattice pier for bridge pier and bridge repair work, characterized in that: The overall shape of the steel pipe lattice pier is a U-shaped structure, including the bearing platforms arranged on both sides of the inclined pier. The bearing platforms serve as the anchor points of the steel pipe lattice pier and are composed of multiple vertically arranged steel pipe piles and a horizontally arranged connecting beam 1. Concrete is poured inside and outside the bearing platforms to form concrete pile foundations, and the cross-sectional shapes of the bearing platforms on the left and right sides are different according to the on-site construction environment; Multiple steel columns are vertically arranged at the tops of the bearing platforms on both sides. Adjacent steel columns are connected by multiple horizontal braces in the horizontal direction, and the horizontal braces at different heights are connected by diagonal braces. The tops of the steel columns on both sides are connected by multiple crossbeams at different heights, and the crossbeams at different heights on the same side are connected and fixed by diagonal columns; The steel columns adopt a segmented structure, including a column foot section and multiple standard sections; Double-layer steel bar meshes are pre-embedded at the top and bottom layers of the bearing platform. Steel plates are also pre-embedded at the top layer of the bearing platform, and multiple bolts are pre-embedded inside the steel plates. The positions of the bolts correspond to those of the steel columns one by one; The connecting beam 1 is arranged on the top surface of the steel pipe piles, and multiple connecting beam 1s connect the discrete steel pipe piles into a whole.

2. The steel tube lattice pier for bridge pier and bridge repair work according to claim 1, characterized in that: When the distance between two discrete steel pipe piles is greater than or equal to 6m, a connecting beam 2 is added between their tops for reinforcement.

3. The steel tube lattice pier for bridge pier and bridge repair work according to claim 2, characterized in that: Both the connecting beam 1 and the connecting beam 2 are I-shaped steel.

4. The steel tube lattice pier for bridge pier and bridge repair work according to claim 1, characterized in that: Among the bearing platforms on the left and right sides, the cross-section of one bearing platform is rectangular, and the cross-section of the other bearing platform is trapezoidal.

5. A construction method for a steel pipe lattice pier used for pier and bridge repair operations, applicable to the steel pipe lattice pier described in any one of claims 1-4. The construction method specifically includes the following steps: S1. Determine the positions of the bearing platforms on both sides according to the position of the inclined pier, and then use a crane to transport the steel pipe piles to the designated positions; S2. Place the steel pipe piles on the construction ground according to the planned positions, and then drive them into the bedrock surface through a vibratory hammer; S3. After determining that the insertion depth of the steel pipe piles is appropriate, connect and fix them through the connecting beam 1 between adjacent steel pipe piles; S4. When the distance between adjacent steel pipe piles is relatively large, add a connecting beam 2 at their tops for reinforcement; S5. Lay steel bar meshes on the top and bottom layers of the steel pipe piles, and bury steel plates at the top layer. Bolts are pre-embedded at the steel plate positions, and then pour concrete to form a concrete pile foundation; S6. Erect the steel columns by aligning with the positions of the bolts. Adjacent steel columns are connected by horizontal braces in the horizontal direction, and the horizontal braces at different heights are connected and fixed by diagonal braces; S7. The tops of the steel columns on both sides are connected by multiple crossbeams at different heights, and the two crossbeams on the same side are connected and fixed by diagonal columns; S8. The erection of the steel pipe lattice pier is completed. Its overall shape is a U-shaped structure, and the inclined pier is located in the middle of the steel pipe lattice pier.

6. A method for constructing a steel tube lattice pier for bridge pier and bridge repair work according to claim 5, characterized in that: In the step S5, a new welded "L"-shaped 25 steel bar is passed through the steel plate to increase the stability of its connection with the steel pipe pile.

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