Local scour protection device for bridge piers

Abstract

The present application belongs to the technical field of preventing bridge pier from being eroded, and particularly relates to a local scouring and erosion protection device for bridge pier. The device comprises a base, a protection assembly and a brush. The protection assembly is arranged on the base. The protection assembly comprises an inner protection net surrounding the bridge pier and an outer protection net surrounding the inner protection net. A group of inner circle steel pipes are evenly arranged on the side of the inner protection net close to the bridge pier. A group of outer circle steel pipes are evenly arranged between the inner protection net and the outer protection net. The lower part of the inner circle steel pipe is connected with the inner protection net through a cross beam A. In the process of installation and operation, the device will not damage the structure of the bridge pier, and will not transmit the force received by the protection device to the bridge pier. The base can also reinforce the foundation of the bridge pier. The protection net, the brush and the steel pipe of the device are divided into two layers, i.e. the inner layer and the outer layer. The protection net, the brush and the steel pipe of the outer layer form an outer protection system, and the protection net, the brush and the steel pipe of the inner layer form an inner protection system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of preventing bridge pier from being eroded, and particularly relates to a local scouring and erosion protection device for bridge pier. BACKGROUND

[0002] China has a developed economy, vast territory and developed river system, and each large, medium and small city is built along the river, and large and small bridges appear on each river like mushrooms after rain.

[0003] Scouring is one of important factors causing bridge diseases, and local scouring of bridge foundation seriously threatens the normal operation of traffic infrastructure such as bridges and culverts, and with the substantial increase in the number of bridges, accidents caused by bridge pier scouring also increase, threatening the safety of human life. Bridge foundation scouring damage often occurs suddenly without prior warning, and it is difficult to be monitored during the flood period. The traditional bridge pier protection measures are divided into active protection and passive protection, the active protection is to control the water flow to reduce the motive power of scouring, and the passive protection is to change the characteristics of the scouring object and improve the riverbed scouring resistance. The bridge pier, as an important component of the bridge structure, is directly subjected to the erosion damage of the sediment-laden flow, which has a very serious impact on the entire structure bearing, safety and durability. Therefore, it is very important to study the erosion, bearing capacity change of the bridge pier under high-speed sediment-laden flow and solve the problem of bridge pier scouring. SUMMARY

[0004] In view of the existing defects and problems, the purpose of the present application is to provide a local scouring and erosion protection device for bridge pier, which can protect the bridge pier from the erosion of water flow on the surface and the local scouring of the foundation, and the structure of the bridge pier itself is not damaged during the installation of the current part of the protection device.

[0005] The technical problem of the present application is solved by the following solution: a local scouring and erosion protection device for bridge pier, comprising a base, a protection assembly and a brush, the protection assembly is arranged on the base, the protection assembly comprises an inner protection net surrounding the bridge pier and an outer protection net surrounding the inner protection net, a group of inner ring steel pipes are uniformly arranged on the side close to the bridge pier of the inner protection net, a group of outer ring steel pipes are uniformly arranged between the inner protection net and the outer protection net, the lower part of the inner ring steel pipe is connected with the inner protection net through a cross beam A, the lower part of the outer ring steel pipe is connected with the outer protection net through a cross beam B, the upper part of the inner ring steel pipe is connected with the inner protection net through a connecting piece A, the upper part of the outer ring steel pipe is connected with the outer protection net through a connecting piece B, and the inner ring steel pipe and the outer ring steel pipe are both sleeved with the brush.

[0006] Further, the base is a concrete foundation poured with concrete, and the upper plane of the concrete foundation is at the same height as the riverbed surface.

[0007] Further, the inner layer protection net and the outer layer protection net are both in the shape of a "bamboo cage" with two pairs of oblique intersection.

[0008] Further, the diameter of the outer layer protection net is larger than that of the inner layer protection net.

[0009] Further, the connecting piece A and the connecting piece B are both in the shape of L, one end of the connecting piece A is inserted into the inner circle steel pipe, the other end of the connecting piece A passes through the inner layer protection net and is matched with a split pin, one end of the connecting piece B is inserted into the outer circle steel pipe, the other end of the connecting piece B passes through the outer layer protection net and is also matched with a split pin.

[0010] Further, the fixed cylinder is pre-buried on the base and below the inner circle steel pipe and the outer circle steel pipe, the fixed cylinder is higher than the upper surface of the base, and the inner circle steel pipe and the outer circle steel pipe are respectively inserted into the fixed cylinder and connected with the fixed cylinder through bolts.

[0011] Further, the base installation device further comprises a support frame sleeved on the pier, a sliding bearing platform for moving the base and a turnover supporting mechanism, the sliding bearing platform is sleeved on the support frame, and the turnover supporting mechanism is arranged on the outer periphery of the sliding bearing platform.

[0012] Further, the height of the support frame is higher than the horizontal plane, and the support frame comprises an outer frame and an inner frame, the inner frame is arranged in the outer frame and connected through a steel piece.

[0013] The present application has the following advantages: 1. In the process of installation and operation, the structure of the pier is not damaged, the force received by the protection device is not transmitted to the pier, and the base can also reinforce the pier foundation.

[0014] 2. The protection net, the brush and the steel pipe of the device are divided into two layers, the protection net, the brush and the steel pipe of the outer layer form an outer layer protection system, and the protection net, the brush and the steel pipe of the inner layer form an inner layer protection system.

[0015] 3. Through the installation device, the base can be conveniently spliced and installed, so that the protection device can be used for the pier which has been built and put into use, and the base can be stably and safely installed in water. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the present application;

[0017] Figure 2 is a top view of the present application;

[0018] Figure 3 is a structural schematic view of the brush of the present application;

[0019] Figure 4is the axial section view of the inner layer protective net in the present application;

[0020] Figure 5 is the axial section view of the outer layer protective net in the present application;

[0021] Figure 6 is the overall structure schematic diagram of the base mounting device in the present application;

[0022] Figure 7 is the structure schematic diagram of the support frame in the present application;

[0023] Figure 8 is the side view of the support frame in the present application;

[0024] Figure 9 is the top view structure schematic diagram of the support frame in the present application;

[0025] Figure 10 is the structure schematic diagram of the sliding bearing platform and the overturning support mechanism in the present application.

[0026] In the figure, 1, base; 2, protective assembly; 21, inner layer protective net; 22, outer layer protective net; 3, brush; 4, inner ring steel pipe; 5, outer ring steel pipe; 61, connecting piece A; 62, connecting piece B; 71, crossbeam A; 72, crossbeam B; 8, fixed cylinder; 9, overturning support mechanism; 91, middle ring; 92, L-shaped swing lever; 93, elastic member; 931, upper support; 932, wedge-shaped plate; 933, upper ring; 934, pad plate; 935, screw rod; 94, ratchet pawl; 10, sliding bearing platform; 101, lower ring; 102, connecting rod; 103, support rod; 104, sleeve pipe; 105, fixed ring; 11, support frame; 111, outer frame; 112, inner frame. DETAILED DESCRIPTION

[0027] The present application is further illustrated below in combination with the drawings and examples.

[0028] Example 1: The purpose of example 1 is to provide a bridge pier partial erosion and scour protection device for protecting the bridge pier from the water flow erosion on the surface of the bridge pier and the partial scour of the foundation, and the current part of the protective device will cause damage to the structure of the bridge pier itself in the installation process.

[0029] In combination with the drawings Figures 1-5Further illustrate the present application: including the base 1, protection assembly 2, brush 3, the base 1 uses the concrete foundation of concrete pouring, and the upper plane of concrete foundation is at the same height with riverbed surface, protection assembly 2 includes the inner layer protection net 21 surrounding bridge pier and the outer layer protection net 22 surrounding inner layer protection net, inner layer protection net 21 and outer layer protection net 22 all adopt the structure similar to "bamboo cage", can use plastic in actual engineering, the diameter of outer layer protection net 22 is greater than the diameter of inner layer protection net 21, protection net not only can reduce the flow velocity of water flow, make suspended load sediment settlement, still can protect bridge pier from the impact of river floating object, the side of inner layer protection net 21 close to bridge pier is provided with a group of inner circle steel pipes 4, a group of outer circle steel pipes 5 are arranged between outer layer protection net 22 and inner layer protection net 21, the fixed cylinder 8 is embedded on the base 1 and is located below inner circle steel pipe 4 and outer circle steel pipe 5 respectively, the fixed cylinder 8 is higher than the upper plane of base 1, the inner circle steel pipe 4 and outer circle steel pipe 5 are inserted into fixed cylinder 8 respectively and are connected with fixed cylinder 8 through bolt, facilitate the fixation of inner circle steel pipe 4 and outer circle steel pipe 5, and convenient for later replacement, the lower part of inner circle steel pipe 4 is connected with inner layer protection net 21 through crossbeam A71, the lower part of outer circle steel pipe 5 is connected with outer layer protection net 22 through crossbeam B72, one end of crossbeam A71 is fixedly connected with inner circle steel pipe 4, the other end of crossbeam A71 passes through inner layer protection net 21 and is matched with split pin, one end of crossbeam B72 is fixedly connected with outer circle steel pipe 5, the other end of crossbeam B72 passes through outer layer protection net 22 and is also matched with split pin, to facilitate the fixation and replacement of two layer protection nets, the upper part of inner circle steel pipe 4 is connected with inner layer protection net 21 through connecting piece A61, the upper part of outer circle steel pipe 5 is connected with outer layer protection net 22 through connecting piece B62, the connecting piece A61 and connecting piece B62 are all L-shaped structure, one end of connecting piece A61 is inserted into inner circle steel pipe 4, the other end of connecting piece A61 passes through inner layer protection net 21 and is matched with split pin, one end of connecting piece B62 is inserted into outer circle steel pipe 5, the other end of connecting piece B62 passes through outer layer protection net 22 and is also matched with split pin, to facilitate the later replacement of brush 3, the inner circle steel pipe 4 and outer circle steel pipe 5 are all sleeved with brush 3, brush 3 can rotate freely around inner circle steel pipe 4 and outer circle steel pipe 5 respectively, the main role of brush 3 is to reduce the flow velocity of water flow, block suspended load sediment to continue to move forward, make it settle down.

[0030] Example 2: the bridge pier local scouring and erosion protection device proposed in example 1, the purpose of example 2 is to provide a method for installing the device on the bridge pier.

[0031] Step 1: excavate the riverbed around the bridge pier, the size of excavation is same with the size of base 1.

[0032] 1) use on-site pouring: need to pre-embed fixed cylinder 8 on base 1, so that it is not poured;

[0033] 2) using prefabrication method: two hollow half-cylinder cast in advance are transported to the site for splicing installation into a whole base 1, also need to reserve the position of the fixed cylinder 8, convenient for the fixation of the inner circle steel pipe 4 and the outer circle steel pipe 5.

[0034] Step 2: the inner circle steel pipe 4 and the outer circle steel pipe 5 are inserted into the corresponding fixed cylinder 8, and the inner circle steel pipe 4 and the outer circle steel pipe 5 are fixed in the fixed cylinder 8 in turn by bolts, then the lower beam A71 of the inner circle steel pipe 4 is fixed by cotter pin through the inner layer protective net 21, the lower beam B72 of the outer circle steel pipe 5 is also fixed by cotter pin through the outer layer protective net 22, then the brush 3 is installed in turn, then one end of the connecting piece A61 is installed back on the inner circle steel pipe 4, the other end is fixed by cotter pin through the inner layer protective net 21, one end of the connecting piece B62 is installed back on the outer circle steel pipe 5, the other end is fixed by cotter pin through the outer layer protective net 22.

[0035] Step 3: the two layers of protective nets are rolled up at the corresponding position, the two ends are fixed with steel wire to form a cylindrical net, and the inner layer protective net 21 and the beam A71 are connected and fixed together by cotter pin, and the outer layer protective net 22 and the beam B72 are fixed together.

[0036] Example 3: according to the bridge pier which has been built and put into use, if the protective device is used to protect the bridge pier, it is not appropriate to use the method of pouring in place for the base 1 in the presence of water, so on the basis of example 1 and example 2, a device for splicing and installing the base 1 is used to realize the stable and safe installation of the base 1 in water.

[0037] As shown in figures 6-10, a support frame 11 is sleeved on the bridge pier, a sliding bearing platform 10 and a turnover support mechanism 9 for driving the base into water are sleeved on the support frame, the support frame 11 is in the form of a hollow cylinder as a whole, the height of the support frame 11 is higher than the height of the water surface, which is convenient for the workers to complete the assembly of the base 1, the support frame 11 includes an outer frame 111 and an inner frame 112 arranged along the circumference by steel pieces, the inner frame 112 is arranged in the outer frame 111 and connected by steel pipe pieces, the outer frame 111 and the inner frame 112 are both circular ring structures connected by bolts, which is convenient for the installation and disassembly of the support frame 11, the diameter of the inner frame 112 is just wrapped around the bridge pier, reducing the shaking during transportation of the base 1.

[0038] The sliding bearing platform 10 comprises a lower ring 101 sleeved on the outer frame, connecting rods 102 and support rods 103, the connecting rods are four and are evenly arranged at the four peripheries of the lower ring 101, the upper part of the connecting rod 102 is provided with a hanging hole, the bottom of the connecting rod 102 is fixedly welded with a sleeve 104, the support rod 103 is sleeved in the sleeve 104, and the base 1 is placed on the support rod 103; a worker assembles the base 1, and after assembly, the crane pulls the connecting rod 102 to slowly convey the base 1 into water.

[0039] The overturning support mechanism 9 comprises a middle ring 91, L-shaped swing rods 92 and a tension member 93, the middle ring 91 is sleeved outside the connecting rod 102 and located at the upper part of the lower ring 101, four hinge seats are evenly welded at the four peripheries of the middle ring 91, the hinge seats are hinged with the L-shaped swing rods 92, the bottom of the L-shaped swing rod 92 is fixed with a pawl 94, the tension member 93 is arranged at the upper part of the L-shaped swing rod 92, the tension member 93 comprises an upper support 931 fixedly arranged at the inner side of the top of the L-shaped swing rod, a wedge-shaped plate 932 arranged at the upper part of the L-shaped swing rod, and an upper ring 933 sleeved on the wedge-shaped plate 932, a backing plate 934 is fixedly arranged on the upper ring 933, and a groove is formed in the backing plate 934; the upper support 931 and the backing plate 934 are connected through a screw rod, the height of the upper ring on the wedge-shaped plate 932 is adjusted by rotating the screw rod 935, so that the rotation of the pawl 94 at the bottom of the L-shaped swing rod 92 is adjusted; on one hand, rotating the screw rod 935 makes the upper ring 933 move downward, the L-shaped swing rod 92 moves inward, the pawl 94 tightly grips the inner wall of the base 1 to fix the base 1; on the other hand, it is also convenient to disassemble the support rod 103; when the L-shaped swing rod 92 is taken out, the screw rod 935 is rotated to make the upper ring move upward, the L-shaped swing rod 92 moves outward, the pawl 94 moves away from the inner wall of the base 1, and the L-shaped swing rod 92 is pulled upward, so that the middle ring 91 and the L-shaped swing rod 92 are taken out; the upper ring 933, the middle ring 91 and the lower ring 101 are all circular ring structures formed by bolt connection of two half circular rings, which is convenient for installation and disassembly.

[0040] The beneficial effects are that the base is assembled on the support frame, the base is slowly sent into water for fixation by using the crane to pull the connecting rod, the protective device is convenient for use on the bridge pier which has been built and put into use, the support frame, the sliding bearing platform and the overturning support mechanism are all arranged in a detachable mode, the installation device can be repeatedly used after disassembly.

[0041] Embodiment 4: The embodiment is basically the same as Embodiment 3, except that a fixing ring 105 is sleeved on the upper part of the connecting rod 102, which can fix the upper part of the connecting rod 102 and prevent the lower ring 101 from turning outward when the support rod 103 bears the gravity of the base 1.

[0042] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A local anti-erosion and scouring protection device for bridge piers, characterized in that: The system includes a base, protective components, and a brush. The protective components are mounted on the base and consist of an inner protective net surrounding the pier and an outer protective net surrounding the inner protective net. A set of inner ring steel pipes is evenly arranged on the side of the inner protective net closest to the pier, and a set of outer ring steel pipes is evenly arranged between the outer and inner protective nets. The lower part of the inner ring steel pipes is connected to the inner protective net via a crossbeam A, and the lower part of the outer ring steel pipes is connected to the outer protective net via a crossbeam B. The upper part of the inner ring steel pipes is connected to the inner protective net via a connector A. The outer ring steel pipe is connected to the inner ring steel pipe through connector B. Both connector A and connector B are L-shaped structures. One end of connector A is inserted into the inner ring steel pipe, and the other end of connector A passes through the inner ring steel pipe and is fitted with a cotter pin. One end of connector B is inserted into the outer ring steel pipe, and the other end of connector B passes through the outer ring steel pipe and is also fitted with a cotter pin. Both the inner and outer ring steel pipes are fitted with brushes, which can rotate freely around the inner and outer ring steel pipes respectively.

2. The bridge pier local anti-erosion and scouring protection device according to claim 1, characterized in that: The base is a concrete foundation made of cast concrete, and the upper surface of the concrete foundation is at the same height as the riverbed.

3. The bridge pier local anti-erosion and scouring protection device according to claim 1, characterized in that: Both the inner and outer protective nets adopt a "bamboo cage" structure with two obliquely intersecting layers.

4. The bridge pier local anti-erosion and scouring protection device according to claim 1, characterized in that: The diameter of the outer protective mesh is larger than the diameter of the inner protective mesh.

5. The local anti-erosion and scouring protection device for bridge piers according to claim 1, characterized in that: Fixed cylinders are pre-embedded on the base and directly below the inner and outer steel pipes. The fixed cylinders are higher than the upper plane of the base. The inner and outer steel pipes are respectively inserted into the fixed cylinders and connected to the fixed cylinders by bolts.

6. The bridge pier local anti-erosion and scouring protection device according to claim 1, characterized in that: It also includes a base mounting device, which includes a support frame fitted on the pier, a sliding platform that drives the base to move, and a flipping support mechanism. The sliding platform is fitted on the support frame, and the flipping support mechanism is located on the outer periphery of the sliding platform.

7. A local anti-erosion and scouring protection device for bridge piers according to claim 6, characterized in that: The height of the support frame is higher than the horizontal plane. The support frame includes an outer frame and an inner frame. The inner frame is set inside the outer frame and connected by reinforcing ribs.

Images