Self-locking prefabricated segment assembly type bridge pier based on spiral socket and construction method of self-locking prefabricated segment assembly type bridge pier

Abstract

The invention relates to a self-locking prefabricated segment assembly type pier based on spiral socket and a construction method thereof.The assembly type pier comprises a bearing platform and a prefabricated cover beam, the bearing platform is fixedly arranged on the ground, and a lower-layer pier column, a middle-layer pier column and an upper-layer pier column are sequentially arranged between the bearing platform and the cover beam; the lower-layer pier column is connected with the lower portion of the middle-layer pier column in a spiral bell-and-spigot mode, and the upper-layer pier column is connected with the upper portion of the middle-layer pier column in a spiral bell-and-spigot mode. The characteristics of cost reduction and efficiency improvement of the assembly technology can be fully reflected in the construction process, wet casting operation is reduced to the maximum extent, vertical loosening of the bridge pier can be triggered when an earthquake occurs, and the overall seismic toughness and post-earthquake function restorability of the bridge are improved.

Description

Technical Field

[0001] The present invention relates to the field of fully prefabricated bridge construction, and more specifically, to a self-locking precast segmental assembled pier based on spiral socket connection and its construction method. Background Art

[0002] Most existing fully prefabricated bridge projects are constructed using the "equivalent cast-in-place" structural system, that is, the advantages of the assembly process are fully utilized during the bridge construction process, but the completed bridge should still continue the traditional cast-in-place bridge structural form to meet the design requirements of the current specifications. Since multiple connection nodes require on-site formwork erection and grouting for cast-in-place, the existing socket connection type, sleeve type, and splicing type prefabricated bridges have not achieved full assembly, and the cast-in-place nodes need to be optimized, and the construction efficiency needs to be improved.

[0003] On the other hand, the erection of each component of the prefabricated bridge still follows the bottom-up construction sequence. The successful installation of assembly components such as the capping beam and the deck box girder depends on the precise erection of the lower pier. The accuracy requirements for pier attitude adjustment and verticality straightening are extremely high. Even a small error may lead to rework and delay the overall construction period. Therefore, the reasonable design of the prefabricated pier considering the on-site assembly process is crucial.

[0004] As an important lifeline project in the city, the completed bridge should be developed and upgraded in accordance with the concept of resilient seismic design to improve the post-disaster functional recoverability of the bridge and ensure the normal operation of the city after the disaster. The seismic resilience of the existing prefabricated bridge after completion is not much different from that of the original cast-in-place bridge, and the resilient function of the pier needs to be improved. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a self-locking precast segmental assembled pier based on spiral socket connection and its construction method, which can fully reflect the cost reduction and efficiency improvement characteristics of the assembly process during the construction process, minimize the wet-casting operation to the greatest extent, trigger the vertical loosening of the pier during an earthquake, and improve the overall seismic resilience and post-earthquake functional recoverability of the bridge.

[0006] The technical solution adopted by the present invention to solve its technical problems is: to construct a self-locking precast segmental assembled pier based on spiral socket connection, including a bearing platform and a precast capping beam. The bearing platform is fixedly arranged on the ground. A lower pier column, a middle pier column, and an upper pier column are sequentially arranged between the bearing platform and the capping beam. The lower pier column is spirally socket-connected to the lower part of the middle pier column, and the upper pier column is spirally socket-connected to the upper part of the middle pier column.

[0007] According to the above solution, spiral columns are provided at the upper end of the lower pier column and the lower end of the upper pier column, and spiral grooves are provided on the middle pier column to cooperate with the spiral columns.

[0008] According to the above solution, the lower pier column, the middle pier column, and the upper pier column have the same diameter.

[0009] According to the above solution, the angle when the spiral column is screwed into the spiral groove is 25 - 40°.

[0010] According to the above solution, the end of the spiral column is a 60° conical surface.

[0011] According to the above solution, a self - locking device is provided between the connection of the lower pier column and the middle pier column, and a self - locking device is provided between the connection of the middle pier column and the upper pier column.

[0012] According to the above solution, the self - locking device includes a driving rack, a driven rack, a gear set and a slider arranged inside the spiral column. The spiral column is provided with an inclined first slide rail, the middle pier column is provided with a second slide rail connected to the first slide rail. The slider is arranged in the first slide rail. The driven rack is vertically arranged, and the lower end of the driven rack is inserted into a lock groove on the back of the slider. The driving rack is horizontally arranged, and the lock tongue at the end of the driving rack extends out of the spiral column. The driving rack meshes with the pinion on the gear set, and the driven rack meshes with the pinion on the gear set. When the spiral column is inserted into the spiral groove, the lower end of the slider slides into the second slide rail.

[0013] According to the above solution, the spiral column is provided with a pin shaft hole, and the gear set is positioned by a pin shaft inserted into the pin shaft hole.

[0014] According to the above solution, a plurality of the self - locking devices at the same level are arranged at intervals.

[0015] The present invention also provides a construction method for a self - locking precast segment assembled bridge pier based on spiral socket - and - spigot, including the following steps:

[0016] S1. Before transporting the upper pier column and the middle pier column to the hoisting site, install the lower pier column on the bearing platform and adjust its angle to be vertical;

[0017] S2. The hoisting platform vertically hoists the middle pier column, and smoothly moves it above the lower pier column; adjust the self - rotation angle of the middle pier column in the horizontal direction to align it with the spiral column of the lower pier column; slowly lower the middle pier column to make the middle pier column and the lower pier column socket - and - spigot;

[0018] S3. Lower the middle pier column to a certain height to let the middle pier column align itself; after confirming the above step is correct, vertically hoist the upper pier column and smoothly move it above the middle pier column; adjust the horizontal rotation angle of the upper pier column to align the spiral column of the upper pier column with the spiral groove of the middle pier column;

[0019] S4. Slowly lower the upper pier column to make the upper pier column and the middle pier column socket - and - spigot together, and lower the upper pier column to make the upper pier column contact the lower pier column, and the whole forms a cylindrical pier column;

[0020] S5. Hoist the capping beam above the upper pier column and butt it with the steel bars at the upper part of the upper pier column.

[0021] Implementing the self-locking precast segment assembled bridge pier based on spiral socket and spigot and its construction method of the present invention has the following beneficial effects:

[0022] 1. The pier column segments prefabricated in advance in the factory of the present invention can make the components more refined, avoiding the cumbersome docking steps of on-site casting or other docking methods, greatly reducing the engineering difficulty of building bridge piers in remote areas such as mountain valleys, and the size of each pier column segment is adjustable, which is convenient for transportation to the construction site;

[0023] 2. The present invention greatly reduces the amount of steel bar installation and the use of labor during the connection of grouting sleeves, reduces the complex links of steel structure connection, reduces the complicated processes of formwork and high-altitude casting, and only needs to adjust the angle of the first connection during hoisting, and then it can be screwed in automatically by gravity and locked automatically, saving redundant links such as auxiliary attitude and angle adjustment;

[0024] 3. After the spiral socket and spigot assembled bridge pier of the present invention is assembled, its structural horizontal deformation ability is higher than that of conventional bridge piers, and its seismic performance will be significantly improved;

[0025] 4. The spiral socket and spigot assembled bridge pier of the present invention can be applied to various construction situations. For example, in landforms such as mountain valleys and river valleys, the integral bridge pier can be divided into multiple segments, which can be prefabricated and then assembled uniformly. Its detachable property can make it used for temporary construction in emergency situations such as post-disaster relief and road and bridge widening. Its fast construction speed and simplicity can also make it applied to road and bridge maintenance and other aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0027] Figure 1 is a structural schematic diagram of the self-locking precast segment assembled bridge pier with spiral socket and spigot of the present invention;

[0028] Figure 2 is a schematic diagram of the lower pier column, middle pier column and upper pier column;

[0029] Figure 3 is a sectional plan view of the spiral column;

[0030] Figure 4 is a schematic diagram of the middle pier column;

[0031] Figure 5 is a sectional plan view of the middle pier column;

[0032] Figure 6It is a schematic cross-sectional view of the middle pier column in the orthogonal direction;

[0033] Figure 7 It is a schematic cross-sectional view of the cooperation between the spiral column and the spiral groove;

[0034] Figure 8 It is a horizontal sectional view of the quadrilateral pier column;

[0035] Figure 9 It is a horizontal sectional view of the two-sided pier column;

[0036] Figure 10 It is a schematic structural view of the self-locking device;

[0037] Figure 11 It is a schematic view of the first slide rail and the second slide rail;

[0038] Figure 12 It is a schematic view of the installation position of the self-locking device;

[0039] Figure 13 It is a schematic structural view of the slider;

[0040] Figure 14 It is a schematic view of the locked state of the slider;

[0041] Figure 15 It is a schematic view of the unlocked state of the slider. Detailed implementation manners

[0042] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0043] As Figures 1 - 15 shown, the self-locking precast segmental assembled bridge pier based on spiral socketing of the present invention includes a bearing platform 6 and a precast capping beam 5, and the bearing platform 6 is fixedly arranged on the ground. A lower pier column 3, a middle pier column 2, and an upper pier column 1 are sequentially arranged between the bearing platform 6 and the capping beam 5. The lower pier column 3 is spirally socketed and connected to the lower part of the middle pier column 2, and the upper pier column 1 is spirally socketed and connected to the upper part of the middle pier column 2. The spiral socketing type has the characteristic of self-assembly. After preliminary alignment, it can rely on the gravity of the pier column to automatically rotate into alignment, reducing the fine error adjustment and straightening procedures in the construction process of conventional socketed bridge piers. The spiral socketed assembled bridge pier utilizes the principle that the same pitch spiral lines are tangent and concentric after rotation, enabling the whole to ensure being at the same vertical angle and being mutually extruded when under pressure, making their connection more compact.

[0044] Furthermore, spiral columns 7 are provided at the upper end of the lower pier column 3 and the lower end of the upper pier column 1, and spiral grooves 8 cooperating with the spiral columns 7 are provided on the middle pier column 2. The number of the spiral columns 7 and the spiral grooves 8 can be set according to actual construction requirements. In this embodiment, three are set, which is a triangular pier column. Figure 8There are four of them, which are quadrilateral pier columns. Figure 9 There are two of them, which are bilateral pier columns.

[0045] The diameters of the lower pier column 3, the middle pier column 2 and the upper pier column 1 are the same. When the spiral column 7 is screwed into the spiral groove 8, the angle is 25 - 40°. The end of the spiral column 7 is a 60° conical surface, which greatly reduces the positioning difficulty when installing the pier column. The pitch of the spiral line adopted in this embodiment is about six to nine times the diameter of the pier column, and the scanning and segmentation height is one-sixth of the pitch. That is to say, the screwing-in angles at both ends are 30° respectively, which can not only play the design role but also reduce the construction and manufacturing difficulties. The pitch P = 9D, where D is the diameter of the pier column.

[0046] For the installation process of the spiral socket-assembled bridge pier column, its spiral angle, pitch and screwing-in length are not unique and can be changed according to construction requirements and the change of material strength. The present invention reserves the expansion of its assembly method. For example: in a certain embodiment, the pitch of the quadrilateral pier column is 5 times the side length, and the screwing-in angle is 25°, which is applicable to narrow bedrock geology and the assembly efficiency is increased by 20%. In soft soil areas, the pitch is adjusted to 4 times the diameter of the pier column, and the screwing-in angle is increased to 40° to enhance the bearing capacity.

[0047] As Figure 7 shown, the horizontal section of the spiral socket structure is mainly the spiral column 7 and the middle pier column 2. The shape design method of the basic section graphics of the spiral column 7 and the middle pier column 2 is as follows:

[0048] First, draw the shape of the circular pier column, divide it into six equal parts to obtain six intersection points with the outer layer of the circle, then divide one of the parts into two 30° sectors, and then draw a small circle with a radius of five-sixteenths of the radius of the large circle from the center point and obtain the intersection points with the 30° equal division lines. Finally, make a three-point arc with the adjacent two endpoints of the six equal divisions and the intersection points of the 30° equal division lines and the small circle, and intersect with a point at a distance of one-fifteenth of the radius above the midpoint of the adjacent side radius, and rotate it 120° and 240° respectively to obtain the basic section graphics. In this way, the cross-sectional areas of the spiral column 7 and the middle pier column 2 differ by less than 1%.

[0049] Furthermore, a self-locking device 4 is arranged between the connections of the lower pier column 3 and the middle pier column 2, and a self-locking device 4 is arranged between the connections of the middle pier column 2 and the upper pier column 1. The locking between the pier columns is achieved through the self-locking device 4. Figure 1 The circles in

[0050] As Figures 10 - 15As shown in the figure, further, the self-locking device 4 includes a driving rack 402, a driven rack 404, a gear set 403 and a slider 405 arranged inside the screw column 7. The screw column 7 is provided with an inclined first slide rail 406, and the middle pier column 2 is provided with a second slide rail 407 connected to the first slide rail 406. The slider 405 is arranged in the first slide rail 406. The driven rack 404 is arranged vertically, and the lower end of the driven rack 404 is inserted into a locking groove 410 on the back of the slider 405. The driving rack 402 is arranged horizontally, and a locking tongue 401 at the end of the driving rack 402 extends out of the screw column 7. The driving rack 402 meshes with a pinion on the gear set 403, and the driven rack 404 meshes with a pinion on the gear set 403. The screw column 7 is provided with a pin shaft hole 408, and the gear set 403 is positioned by a pin shaft inserted into the pin shaft hole 408.

[0051] The screw column 7 is provided with a reserved groove 409 for installing the self-locking device 4. The installation method of the self-locking device 4 is as follows: First, put the gear set 403 into the reserved groove 409, position it by the pin shaft, then load the driven rack 404 into the first slide rail 406. After adjusting to the appropriate position, load the driving rack 402 into the reserved groove 409 again, so that both the driving rack 402 and the driven rack 404 are in the retracted unlocking state. Then put the slider 405 into the first slide rail 406, align the locking groove 410 of the slider 405 with the driven rack 404, and use a suction cup to assist in pulling out the driving rack 402. Through the transmission of the gear set 403, the driven rack 404 is driven to move downward and inserted into the locking groove 410 of the slider 405 to reach the locking state.

[0052] During the installation process of the pier column, the locking tongue 401 of the driving rack 402 slides inward under the pressure of the contacting column body, thereby driving the driven rack 404 to contract upward, thus releasing the locking state of the slider 405, enabling the slider 405, which already has a downward sliding tendency, to slide downward to the predetermined working position. Part of the slider 405 is located in the first slide rail 406, and the other part is located in the second slide rail 407, playing a locking role. Automatic installation can be achieved without manual labor. When disassembly is required, only the slider 405 needs to be broken and then disassembled in reverse order. To achieve flexible cooperation between various components and increase the service life, a concrete surface treatment agent and lubricating oil can be used.

[0053] Locking stage: When the pier column is screwed in, the driving rack 402 is pressed and slides inward. The gear set 403 drives the driven rack 404 to move upward, releasing the slider 405 to the predetermined working position. The stroke of the driving rack 402 is 50 mm. After the locking tongue 401 is pressed, it drives the gear set 403 to rotate 120°, driving the driven rack 404 to move upward 30 mm, and releasing the slider 405 to the second slide rail 407. Unlocking stage: When the seismic load exceeds the limit, the slider 405 is sheared and fractured. The pier column segment can be vertically twisted to dissipate energy, and the slider 405 can be replaced after the earthquake to repair.

[0054] Furthermore, on the premise of ensuring the locking of the pier column, at least three self-locking devices 4 should be arranged on the same horizontal plane and evenly distributed on the pier column. They act simultaneously when assembling the pier column. That is to say, there should be three chutes on one horizontal plane, and at least two parts of the pier column should be pre-installed with the self-locking device 4, which can be any two parts.

[0055] Furthermore, the positions of the first slide rails 406 are respectively located in the middle of the contact surfaces between the upper pier column 1 and the middle pier column 2, and between the middle pier column 2 and the lower pier column 3, and are respectively located at the three equal division points of the circle in the horizontal projection.

[0056] The present invention also provides a construction method for a self-locking precast segment assembled bridge pier based on spiral socket connection, including the following steps:

[0057] S1. Before transporting the upper pier column and the middle pier column to the hoisting site, install the lower pier column on the bearing platform and adjust its angle to be vertical.

[0058] S2. The hoisting platform vertically hoists the middle pier column, smoothly moves it to about fifty centimeters above the lower pier column; adjusts the self-rotation angle of the middle pier column in the horizontal direction to align it with the notch of the lower pier column; slowly lowers the middle pier column to make the middle pier column and the lower pier column socket-connected.

[0059] S3. Lower the middle pier column to a certain height to let the middle pier column align itself; after confirming the previous step is correct, vertically hoist the upper pier column and smoothly move it to fifty centimeters above the middle pier column; adjust the horizontal rotation angle of the upper pier column to align the spiral column of the upper pier column with the spiral groove of the middle pier column.

[0060] S4. Slowly lower the upper pier column to make the upper pier column and the middle pier column socket-connected together, and slowly lower the upper pier column to make the upper pier column contact the lower pier column.

[0061] S5. Check the overall angle of the pier column, the installation quality, and whether there is any jamming in the self-locking device, so that it is in close contact with the adjacent lower pier column and middle pier column; the middle pier column and the upper pier column are in close contact to form a cylindrical pier column.

[0062] S6. After all the pier columns are installed, hoist the capping beam to above the upper pier column and connect it with the steel bars at the upper part of the upper pier column; finally, check whether the overall horizontal and vertical angles meet the design requirements; ultimately, complete the assembly of the precast pier column and the installation of the capping beam.

[0063] The present invention has the following advantages:

[0064] The installation process of the spiral socket-assembled bridge pier utilizes the principle that the spiral lines with the same pitch are tangent and concentric after rotation, enabling the whole to ensure the same vertical angle and being mutually extruded under pressure to make the connection tighter. In normal operation, natural disasters such as typhoons, as well as car accidents and traffic accidents, a self-locking structure is designed at the spiral socket connection to prevent the pier from sliding in the vertical direction and affecting its use function. However, in extreme earthquake conditions, the slider of the bridge pier can be removed actively or passively. At this time, the bridge pier has a certain degree of vertical torsional freedom, which can effectively isolate and dissipate seismic energy, greatly improve the seismic toughness of the overall bridge, enhance its post-earthquake recoverable function, and better fulfill the mission of disaster response and relief of lifeline projects.

[0065] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the claims of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A self-locking precast segmental assembled bridge pier based on spiral socket connection, comprising a bearing platform and a precast capping beam, the bearing platform is fixedly arranged on the ground, and is characterized in that, A lower pier column, a middle pier column and an upper pier column are sequentially arranged between the bearing platform and the capping beam. The lower pier column is helically inserted and connected to the lower part of the middle pier column, and the upper pier column is helically inserted and connected to the upper part of the middle pier column.

2. The self-locking precast segment assembled bridge pier based on spiral socket joint according to claim 1, wherein Spiral columns are provided at the upper end of the lower pier column and the lower end of the upper pier column, and spiral grooves matching the spiral columns are provided on the middle pier column.

3. The self-lockable precast segmental assembled bridge pier based on spiral socket and spigot according to claim 2, wherein, The lower pier column, the middle pier column and the upper pier column have the same diameter.

4. The self-lockable precast segmental assembled bridge pier based on spiral socket joint according to claim 2, wherein The angle when the spiral column is screwed into the spiral groove is 25° to 40°.

5. The self-locking precast segment assembled bridge pier based on spiral socket joint according to claim 2, characterized in that, The end of the spiral column is a 60° conical surface.

6. The self-locking precast segmental assembled bridge pier based on spiral socket joint according to claim 2, wherein, Self-locking devices are arranged between the connections of the lower pier column and the middle pier column, and between the connections of the middle pier column and the upper pier column.

7. The self-lockable precast segmental assembled bridge pier based on spiral socket joint according to claim 6, characterized in that, The self-locking device includes a driving rack, a driven rack, a gear set and a slider arranged inside the spiral column. An inclined first sliding rail is provided on the spiral column, and a second sliding rail connected to the first sliding rail is provided on the middle pier column. The slider is arranged in the first sliding rail. The driven rack is vertically arranged, and the lower end of the driven rack is inserted into a locking groove on the back of the slider. The driving rack is horizontally arranged, and a locking tongue at the end of the driving rack extends out of the spiral column. The driving rack meshes with a pinion on the gear set, and the driven rack meshes with the pinion on the gear set. When the spiral column is inserted into the spiral groove, the lower end of the slider slides into the second sliding rail.

8. The self-locking precast segment assembled bridge pier based on spiral socket connection according to claim 7, wherein, Pin shaft holes are provided on the spiral column, and the gear set is positioned by a pin shaft inserted into the pin shaft holes.

9. The self-locking precast segment assembled bridge pier based on spiral socket joint according to claim 7, characterized in that, A plurality of the self-locking devices at the same level are arranged at intervals.

10. A construction method of the self-locking precast segment assembled bridge pier based on spiral socket and spigot as claimed in claim 1, characterized in that, Including the following steps: S1. Before transporting the upper pier column and the middle pier column to the hoisting site, install the lower pier column on the bearing platform and adjust its angle to be vertical. S2. Vertically hoist the middle pier column with a hoisting platform, and smoothly move it above the lower pier column; adjust the self-rotation angle of the middle pier column in the horizontal direction to align it with the spiral column of the lower pier column; slowly lower the middle pier column to make the middle pier column and the lower pier column be inserted. S3. Lower the middle pier column to a certain height to make the middle pier column align itself; after confirming that the previous step is correct, vertically hoist the upper pier column and smoothly move it above the middle pier column; adjust the horizontal rotation angle of the upper pier column to align the spiral column of the upper pier column with the spiral groove of the middle pier column. S4. Slowly lower the upper pier column to make the upper pier column and the middle pier column be inserted together, and lower the upper pier column to make the upper pier column contact the lower pier column, and the whole forms a cylindrical pier column. S5. Hoist the capping beam above the upper pier column and butt the steel bars at the upper part of the upper pier column.

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