Scaffold-free reinforced bridge pier structure and construction method

Abstract

The application relates to a scaffold-free reinforced bridge pier structure and a construction method, which comprises a circular steel wire mesh surrounding the outside of a bridge pier reinforcing part, a circle of steel strands surrounding the upper and lower parts of the bridge pier reinforcing part and located outside the circular steel wire mesh, a circle of closely arranged L-shaped UHPC membrane shell pieces arranged along the circumferential direction outside the bridge pier reinforcing part, the bottom and the inner surface upper part of the UHPC membrane shell piece being hung on the corresponding steel strands, and ordinary concrete or UHPC being poured in the space between the UHPC membrane shell piece and the bridge pier reinforcing part. The structure helps to solve the problems that the scaffold is not easy to be erected on the existing water or mountain stream bridge pier, the reinforcing construction is complex, the construction period is long and the like.

Description

TECHNICAL FIELD

[0001] The application relates to a scaffold-free reinforced bridge pier structure and a construction method. BACKGROUND

[0002] Bridge piers across rivers and oceans are damaged by dry-wet cycles, river erosion, ship impact, chloride ion erosion and the like for many years, and the bearing capacity and durability decrease, so the pier body needs to be reinforced.

[0003] A bridge pier body reinforcement construction method is disclosed in CN111648256A, which needs to excavate the pile cap foundation, set up the scaffold, assemble the formwork, and remove the formwork and the scaffold. The method is suitable for reinforcing the construction of the rectangular bridge pier of the existing business line railway bridge, the strength of the formwork meets the requirements, and the formwork is flexible to disassemble and convenient to transport, thereby providing good conditions for rapid work circulation. However, the method needs to set up the formwork and the scaffold before removing the formwork and the scaffold, the construction process is complex, the construction period is long, and a large number of workers are needed, so the construction cost is high.

[0004] CN115233576A discloses a prefabricated assembled bridge pier pipe piece reinforcement device and a repair process, which can make the connection of the pipe piece body more accurate, effectively improve the splicing efficiency of the pipe piece body, and does not need an operator to use bolts and nuts for fixing, and the formwork does not need to be removed. However, the method needs to set up a construction platform, but it is difficult to set up a platform on water or in a mountain stream; the method also needs to assemble from the bottom of the riverbed, and the reinforced area is not accurate. SUMMARY

[0005] The application aims to provide a scaffold-free reinforced bridge pier structure and a construction method, which can help solve the problems of the existing bridge pier on water or in a mountain stream, such as difficulty in setting up a scaffold, complex reinforcement construction, and long construction period.

[0006] The technical scheme of the application is as follows: a scaffold-free reinforced bridge pier structure, which comprises a circular steel wire mesh surrounding the outside of a bridge pier reinforcement part, a circle of steel strands surrounding the upper and lower parts of the bridge pier reinforcement part and located outside the circular steel wire mesh, a circle of closely arranged L-shaped UHPC (ultra-high performance concrete) membrane shell pieces arranged along the circumferential direction outside the bridge pier reinforcement part, a hook for hanging on the steel strand is embedded in the upper part of the inner side surface of the UHPC membrane shell piece, and an arc-shaped groove for setting on the steel strand is arranged on the bottom surface of the lower end of the UHPC membrane shell piece, and ordinary concrete or UHPC is cast in the space between the UHPC membrane shell piece and the bridge pier reinforcement part.

[0007] Further, a hook for hanging on the steel strand is embedded in the upper part of the inner side surface of the UHPC membrane shell piece, and an arc-shaped groove for setting on the steel strand is arranged on the bottom surface of the lower end of the UHPC membrane shell piece.

[0008] Furthermore, a steel mesh is arranged inside the UHPC membrane shell.

[0009] Furthermore, a plurality of support members connected to the bridge piers are evenly distributed along the circumferential direction on the steel strand, and the two ends of the steel strand are connected via fasteners.

[0010] Furthermore, the fastener includes a threaded sleeve rotatably connected to one end of the steel strand, and the other end of the steel strand is rotatably connected to a threaded rod for being threadedly connected to the threaded sleeve.

[0011] Furthermore, the threaded sleeve and the threaded rod are both provided with a nut portion at one end close to the wire rope.

[0012] Furthermore, the support member includes a round tube for being sleeved on the steel strand, a support rod fixed on the round tube and embedded in the pier by drilling and planting reinforcement, and an I-shaped base for bonding to the pier is sleeved on the support rod.

[0013] Furthermore, the support rods and the X-shaped base are bonded and fixed to the bridge piers via adhesive.

[0014] Furthermore, the circular steel wire mesh is composed of two semicircular steel wire meshes and is erected on a support rod, and the overlapping parts of the two semicircular steel wire meshes are connected into one by tying with steel wires.

[0015] A construction method for reinforcing a bridge pier structure without scaffolding, comprising the following steps:

[0016] (1) The reinforced part of the pier is roughened, and multiple holes are drilled at intervals along the circumferential direction on the upper and lower parts of the reinforced part of the pier. The support rod is covered with an "I"-shaped base and implanted into the pier. Super glue is applied inside the hole and on the bottom surface of the "I"-shaped base;

[0017] (2) After the super glue solidifies, two semicircular steel meshes are placed on the support rods, and the overlap of the two semicircular steel meshes is tied with steel wire to form a circular steel mesh;

[0018] (3) The steel strand passes through the circular tube on the support and surrounds the pier, and the two ends of the steel strand are connected with fasteners;

[0019] (4) Rotate the fastener to apply preload;

[0020] (5) Prefabricate several equally divided UHPC membrane shells according to the size of the pier, where the hooks are embedded in the upper inner part of the UHPC membrane shell before pouring, and an arc-shaped groove is reserved at the bottom of the UHPC membrane shell;

[0021] (6) Hang the hook of the UHPC membrane shell on the upper steel strand, and place the arc groove of the UHPC membrane shell on the lower steel strand;

[0022] (7) After the UHPC membrane shell is assembled, ordinary concrete or UHPC is poured inside. After the concrete solidifies, it forms an integrated reinforcement layer with the UHPC membrane shell.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The structure can be installed without setting up scaffolding, which is suitable for water bridge piers or high-altitude reinforcement of bridge piers. It helps to solve the problems of existing water or mountain bridge piers that are difficult to set up scaffolding, complex reinforcement construction, and long construction period.

[0025] 2. The UHPC membrane shell used in this structure serves as both a reinforced formwork and a pier reinforcement layer. After reinforcement, it does not need to be removed, which can improve the durability and impact resistance of the pier. At the same time, it eliminates the formwork and demolding processes, shortening the construction period.

[0026] 3. The structure adopts suspended assembly construction, no scaffolding is required, modular assembly is adopted, and construction is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the overall structural diagram of the present invention;

[0028] Figure 2 Schematic diagram of the structure of the UHPC membrane shell of the present invention;

[0029] Figure 3 This is a schematic diagram of the cooperation between the steel strand and the steel wire mesh of the present invention;

[0030] Figure 4 It is a structural schematic diagram of the fastener of the present invention;

[0031] Figure 5 It is a structural schematic diagram of the support member of the present invention;

[0032] Figure 6 It is a construction flow chart of the present invention;

[0033] In the figure: 1-bridge pier 10-circular steel wire mesh 20-steel strand 30-UHPC membrane shell 31-hook 32-arc-shaped groove 40-support member 41-circular tube 42-support rod 43-X-shaped base 50-fastener 51-threaded sleeve 52-threaded rod 53-nut part. DETAILED DESCRIPTION

[0034] To make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description, but the present invention is not limited thereto.

[0035] refer to Figures 1 to 6

[0036] A scaffold-free reinforced bridge pier structure comprises a circular steel mesh 10 surrounding the reinforcement part of the bridge pier 1, a circle of steel strands 20 surrounding the upper and lower parts of the bridge pier reinforcement part and located outside the circular steel mesh, and a circle of closely arranged L-shaped UHPC (ultra-high performance concrete) membrane shell pieces 30 arranged along the circumferential direction outside the bridge pier reinforcement part, the bottom and inner surface of the UHPC membrane shell piece being hung on the corresponding steel strand, and ordinary concrete or UHPC being cast in the space between the UHPC membrane shell piece and the bridge pier reinforcement part.

[0037] In this embodiment, the upper part of the inner side surface of the UHPC membrane shell piece is embedded with a hook 31 for hanging on the steel strand, and the length of the hook helps to control the distance between the UHPC membrane shell piece and the surface of the bridge pier, thereby ensuring the thickness of the reinforcement layer. The lower end of the UHPC membrane shell piece is provided with an arc-shaped groove 32 for being arranged on the steel strand.

[0038] In this embodiment, the UHPC membrane shell piece is made of ultra-high performance concrete and internally arranged with a steel mesh, thereby improving the ductility and tensile strength of the concrete.

[0039] In this embodiment, a plurality of support pieces 40 connected with the bridge pier are uniformly arranged along the circumferential direction of the steel strand, and the two ends of the steel strand are connected through a fastener 50. The weight of the reinforcement layer is determined according to the thickness and height of the reinforcement, and the number of support pieces is determined based on this, for example, 5, and the steel strand is lifted up through the support pieces.

[0040] In this embodiment, the fastener comprises a threaded sleeve 51 rotationally connected with one end of the steel strand, and a threaded rod 52 rotationally connected with the other end of the steel strand for being screwed with the threaded sleeve. The rotationally connecting the threaded sleeve and the steel strand and the rotationally connecting the threaded rod and the steel strand can avoid the twisting of the steel strand when the threaded sleeve and the threaded rod are rotated. The end of the threaded sleeve and the threaded rod close to the steel strand is provided with a nut part 53, so as to drive the threaded sleeve or the threaded rod to rotate through the nut part. The fastener has two functions: one is to connect the steel strand, and the other is to adjust the pre-tightening force of the steel strand by rotating the nut part, so as to prevent the UHPC membrane shell piece from sliding off the steel strand.

[0041] In this embodiment, the support piece comprises a circular tube 41 for being sleeved on the steel strand, and the steel strand can slide on the circular tube. A support rod 42 embedded in the bridge pier by drilling and anchoring is fixed on the circular tube, and the end of the support rod inserted into the hole of the bridge pier has a spiral protrusion, which helps to improve the fixing strength. A few-shaped base 43 for being bonded with the bridge pier is sleeved on the support rod, thereby increasing the stress area and the bending resistance.

[0042] In this embodiment, the support rod and the few-shaped base are fixedly bonded with the bridge pier by glue.

[0043] In the embodiment, the circular steel wire mesh is composed of two half-circular steel wire meshes and is erected on the support rod, and the overlapping portions of the two half-circular steel wire meshes are connected into one body by steel wire binding.

[0044] A construction method of a scaffold-free reinforced bridge pier structure, the steps are as follows:

[0045] (1) The reinforced part of the bridge pier is chiseled and treated, a plurality of holes are drilled in the upper and lower parts of the reinforced part of the bridge pier along the circumferential direction (for example, 5 holes are drilled, and the included angle between adjacent two holes is 72 degrees), the support rod is sleeved with a Chinese character-shaped base and is implanted into the bridge pier, and strong glue is coated on the bottom surface of the Chinese character-shaped base in the hole;

[0046] (2) After the strong glue is solidified, two half-circular steel wire meshes are erected on the support rod, and the overlapping portions of the two half-circular steel wire meshes are bound by steel wire to form a circular steel wire mesh;

[0047] (3) The steel strand is passed through the circular pipe on the support member, is wound around the bridge pier, and the two ends of the steel strand are connected by a fastener;

[0048] (4) The fastener is rotated to apply a pre-tightening force;

[0049] (5) A plurality of equal UHPC membrane shell pieces are prefabricated according to the size of the bridge pier, a hook is pre-buried on the upper part of the inner side of the UHPC membrane shell piece before pouring, and an arc-shaped groove is reserved on the bottom of the UHPC membrane shell piece;

[0050] (6) The hook of the UHPC membrane shell piece is hung on the upper steel strand, and the arc-shaped groove of the UHPC membrane shell piece is arranged on the lower steel strand;

[0051] (7) After the UHPC membrane shell piece is assembled, ordinary concrete or UHPC is poured in the inside, and after the concrete is solidified, a reinforced layer is formed with the UHPC membrane shell piece.

[0052] The above only describes the preferred embodiment of the present application, and for those skilled in the art, according to the teaching of the present application, different forms of a scaffold-free reinforced bridge pier structure and a construction method can be designed without creative labor, and any equivalent change, modification, replacement and transformation made within the scope of the patent application of the present application without departing from the principles and spirits of the present application shall be included in the scope of the present application.

Claims

1. A scaffold-free reinforced bridge pier structure, characterized in that: The invention comprises a circular steel wire mesh surrounding the outside of the bridge pier reinforcement part, a circle of steel strands surrounding the upper and lower parts of the bridge pier reinforcement part and located on the outside of the circular steel wire mesh, a circle of tightly arranged L-shaped UHPC membrane shells are arranged along the circumferential direction on the outside of the bridge pier reinforcement part, the bottom and the upper inner surface of the UHPC membrane shell are hung on the corresponding steel strands, and ordinary concrete or UHPC is poured in the space between the UHPC membrane shell and the bridge pier reinforcement part; a hook for hanging on the steel strand is embedded in the upper part of the inner side of the UHPC membrane shell, and the lower part of the UHPC membrane shell is hung on the steel strand. The bottom surface of the end is provided with an arc-shaped groove for being laid on the steel strand; a plurality of support members connected to the bridge piers are evenly distributed on the steel strand in the circumferential direction, and the two ends of the steel strand are connected via fasteners; the fastener includes a threaded sleeve rotatably connected to one end of the steel strand, and the other end of the steel strand is rotatably connected to a threaded rod for being screwed to the threaded sleeve; the support member includes a round tube for being sleeved on the steel strand, a support rod embedded in the bridge pier by drilling and planting reinforcement is fixed on the round tube, and an I-shaped base for bonding to the bridge pier is sleeved on the support rod.

2. The scaffolding-free reinforced bridge pier structure according to claim 1, characterized in that: A steel mesh is arranged inside the UHPC membrane shell.

3. The scaffold-free reinforced bridge pier structure according to claim 1, characterized in that: The threaded sleeve and the threaded rod are both provided with a nut portion at one end close to the wire rope.

4. The scaffold-free reinforced bridge pier structure according to claim 1, characterized in that: The support rods and the "X"-shaped base are bonded and fixed to the bridge piers through adhesive.

5. The scaffold-free reinforced bridge pier structure according to claim 1 or 4, characterized in that: The circular steel wire mesh is composed of two semicircular steel wire meshes and is erected on a support rod. The overlapping parts of the two semicircular steel wire meshes are connected into one body by tying with steel wires.

6. A construction method for reinforcing a pier structure without scaffolding as claimed in claim 5, characterized in that: Here are the steps: (1) The reinforced part of the pier is roughened, and multiple holes are drilled at intervals along the circumferential direction on the upper and lower parts of the reinforced part of the pier. The support rod is covered with an "I"-shaped base and implanted into the pier. Super glue is applied inside the hole and on the bottom surface of the "I"-shaped base; (2) After the super glue solidifies, two semicircular steel meshes are placed on the support rods, and the overlap of the two semicircular steel meshes is tied with steel wire to form a circular steel mesh; (3) The steel strand passes through the circular tube on the support and surrounds the pier, and the two ends of the steel strand are connected with fasteners; (4) Rotate the fastener to apply preload; (5) Prefabricate several equally divided UHPC membrane shells according to the size of the pier, where the hooks are embedded in the upper inner part of the UHPC membrane shell before pouring, and an arc-shaped groove is reserved at the bottom of the UHPC membrane shell; (6) Hang the hook of the UHPC membrane shell on the upper steel strand, and place the arc groove of the UHPC membrane shell on the lower steel strand; (7) After the UHPC membrane shell is assembled, ordinary concrete or UHPC is poured inside. After the concrete solidifies, it forms an integrated reinforcement layer with the UHPC membrane shell.

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