CN111877140A - Connecting structure for segment prefabricated assembled pier combination and construction method - Google Patents

Abstract

A connection structure for a segmental prefabricated and assembled bridge pier combination, comprising a pier column and a base, the pier column is composed of a first segment and a second segment, the bottom of the first segment is connected to the base, and the first segment is connected to the base. The top of a segment is connected to the bottom of the second segment, pipelines are pre-buried in the first segment and the second segment respectively, and the pipelines are respectively provided with connecting steel bars and prestressed bundles, and the top of the first segment is pre-buried. A shear key is set, a grouting pipe is preset at the bottom, and the shear key groove and shear key provided at the bottom of the second segment are used together. One end of the prestressed bundle is stretched at the top of the second segment, and the other end is anchored to the base; One end of the connecting steel bar is fixedly connected with the top of the second segment, and the other end is mechanically connected and fixed with the joint steel bar. The bridge pier constructed with the above structure has large construction tolerance and low precision requirements, and can be applied to multi-segment and large-section bridge pier assembly for shear resistance. It has strong capacity and low cost; at the same time, it can make the prefabricated assembled pier suitable for the seismic demand of high seismic area, reduce the residual displacement, and facilitate the post-earthquake repair of the assembled pier.

Description

A connection structure and construction method for segmental prefabricated assembled bridge pier combination

technical field

The invention relates to the field of bridge construction, in particular to a connection structure and a construction method for a segmental prefabricated and assembled bridge pier combination.

Background technique

In recent years, with the active promotion and technological development of prefabricated buildings, the research on the construction of substructures of bridges by segmental prefabrication has become a hot spot at home and abroad. In the fields of railways, urban rail transit, highways, municipal engineering, etc. Due to different influences such as force requirements and structural characteristics, the applicability of the connection forms of prefabricated piers is not the same.

In the field of municipal engineering, segmental prefabricated piers are commonly used in the grouting connection technology of steel sleeves. This connection requires pre-embedded grouting sleeves and reserved steel joints in the prefabricated segments, which requires high installation accuracy and construction. When the height of the pier is high Or when the size of the cross-section is large, the pier needs to be divided into multiple sections along the height direction due to the limitation of the section transportation size. The grouting sleeves need to be connected when each segment is assembled, resulting in difficult construction and high cost. Especially for multi-segment and large-sized bridge piers, the connection technology is limited to a certain extent.

In the field of highway engineering, segmental prefabricated and assembled bridge piers are also commonly connected by prestressed bundles. Prestressed tunnels are reserved in segments, and prestressed steel strands are inserted to form inter-segment connections. The connection requires prestressing tension. , the prestressing cost is high, and the prestressing has the risk of loss and failure. At the same time, the prestressed connection of the assembled piers, according to domestic and foreign theoretical research, test verification and practical experience, the system has problems such as weak energy dissipation capacity and insufficient ductility. Not suitable for high seismic areas.

SUMMARY OF THE INVENTION

The present invention provides a connection structure and a construction method for segmental prefabricated and assembled bridge pier assemblies, aiming at solving the problems of the prior art and providing a multi-segment, large-section bridge pier assembly, which is reliable in connection, has large construction tolerance, The connection structure and construction method of the segmental prefabricated pier combination, which has low precision requirements, strong shear resistance of the section, and low cost, can be applied to the seismic requirements of high seismic areas, reduce residual displacement, and is conducive to post-earthquake repair of assembled piers .

The technical scheme adopted by the present invention to solve the problem is:

A connection structure for a segmental prefabricated and assembled bridge pier combination has a pier column and a base, the pier column is located above the base and is fixedly connected to the base, and is characterized in that: the pier column consists of a first segment, a second It consists of two segments, the bottom of the first segment is connected to the base, the top of the first segment is connected to the bottom of the second segment, the first segment and the second segment are respectively embedded with pipes, the said The bottoms of the first segment and the second segment are respectively provided with extrusion grooves, the top of the first segment is preset with a shear key, and the lower side wall of the first segment is preset with a grouting pipe, so the The bottom of the second segment is provided with a shear keyway. The shear keyway is used in conjunction with the shear key. The position of the shear keyway corresponds to the shear key provided at the top of the first segment. The shape and size of the shear keyway Matching with the shear key; the part of the pipeline is provided with a prestressed bundle, one end of the prestressed bundle is stretched from the top of the pre-embedded pipeline in the second segment, and the other end is pierced from the bottom of the pre-embedded pipeline in the first segment. It is anchored with the base; the other part of the pipeline is provided with continuous connecting steel bars, and the connecting steel bars are fixed by mechanical connection. The other end of the steel bar passes through the pipe from the bottom of the first segment and is mechanically connected and fixed with the joint steel bar provided on the top of the base.

A part of the pipelines embedded in the first segment and the second segment are corrugated pipe tunnels, and the other part of the pipelines are steel pipes. The corrugated pipe tunnels pass through connecting steel bars, and the steel pipes pass through prestressed bundles. Pour in grout.

The first section corresponds to the positions of the pre-buried corrugated pipe holes and the steel pipes in the second section, respectively, and the pre-buried corrugated pipe holes in the first section correspond to the positions of the joint reinforcement bars provided on the top of the base. One end of the mechanically fixed connecting steel bar passes through the corrugated pipe channel at the top of the second segment, and is fixedly connected to the top of the second segment through the cooperation of the steel bar anchor bolt and the steel bar anchor plate, and the other end of the connecting steel bar passes through the first segment. The bottom of the corrugated pipe channel in the segment is mechanically connected with the top of the base with a joint steel bar, and the diameter of the corrugated pipe channel is 25 cm larger than the diameter of the connecting bar.

The steel pipes are pre-buried in the base, and the positions of the steel pipes pre-buried in the base and the steel pipes pre-buried in the first segment are in one-to-one correspondence, and the other end of the prestress bundle passes through the pre-buried steel pipes and the foundation The steel pipe embedded in the seat is anchored at the end of the steel pipe embedded in the base. The base is provided with a prestressed grouting pipe, and the prestressed grouting pipe is connected with the steel pipe embedded in the base.

The base is a cast-in-place base, and the lengths of the joint reinforcement bars provided on the top of the base are different.

The shear key is in the shape of a truncated cone, the vertical section of the shear key is an isosceles trapezoid, the angle between the hypotenuse and the bottom edge of the trapezoid is 45°, and the shear key is meshed with the shear keyway.

The glue extrusion groove is located at the bottom of the first section and the second section respectively, and the first section and the second section are respectively divided into a plurality of areas. The horizontal cross section of the glue extrusion groove is square or rectangular, and the side length 2-10cm.

A heightened segment is arranged between the first segment and the second segment, and the positions of the corrugated pipe holes and steel pipes provided in the heightened segment are the same as those of the first segment and the second segment. The positions of the corrugated pipes and the steel pipes correspond to each other one by one, the bottom structure of the heightened segment is the same as that of the bottom of the second segment, and the top structure of the heightened segment is the same as that of the top of the first segment.

A construction method for the connection structure of the segmental prefabricated assembled bridge pier combination is characterized in that: it has the following steps

Step 1. The base is cast on site, and the first segment and the second segment are prefabricated in the factory;

Step 2, hoist the first segment, insert the connecting steel bar into the pre-buried pipeline of the first segment, and temporarily fix it on the top of the first segment; support the first segment on the temporary jack, and adjust the segment through the temporary jack. Then release the temporary fixation of the connecting steel bars, lower the connecting steel bars to the joint position, and fix the connecting steel bars and the connecting steel bars in one-to-one correspondence mechanically, and chisel the top area of the base, lay a mortar cushion, and remove the temporary Jack, lower the first section for installation by slurry sitting method, and the excess slurry is extruded through the extrusion groove to realize the connection between the first section and the base;

Step 3: Hoist the second segment, move the temporary jack to the top surface of the first segment, hoist the second segment, insert the connecting steel bar into the pre-buried pipeline of the second segment, and temporarily fix it on the second segment Support the second segment on the temporary jack, adjust the space position of the second segment through the temporary jack; release the temporary fixation of the connecting steel bar on the top of the second segment, and lower the connecting steel bar to the joint with the top of the first segment The head of the connecting steel bar at the top of the first segment and the connecting steel bar at the bottom of the second segment are mechanically connected and fixed one-to-one, lay epoxy glue on the top of the first segment, remove the temporary jack, and lower the second segment. segment, the shear key provided at the top of the first segment is in one-to-one correspondence with the shear key groove provided at the bottom of the second segment, the second segment is installed and fixed with the first segment by extrusion method, and the excess The fixed connection between the second segment and the first segment is realized by extrusion through the extrusion groove;

Step 4. After the assembly of each segment is completed, clean the slurry of the extrusion tank, and fill the seam after the cleaning is completed;

Step 5, pouring the grouting slurry into the pipeline where each connecting steel bar is located through the grouting pipe, and anchoring the connecting steel bar in the prefabricated segment;

Step 6. Fix one end of the connecting steel bar on the top of the second segment;

Step 7. When setting the prestressed bundle, insert the prestressed bundle into the embedded pipeline from the top of the second segment, and when it penetrates into the base, anchor the prestressed bundle to the base through the anchoring structure, and The top of the second segment pulls the prestressed bundles one by one, and when bonding prestressing is used, the prestressed compressive slurry is poured into the embedded pipeline through which the prestressed bundles pass;

Step 8. After all the above slurry maintenance is completed, remove the grouting pipeline outside the structure to complete the construction.

A construction method for a connection structure of a segmental prefabricated and assembled bridge pier combination, characterized in that: when multiple segments are used, a heightened segment is added between the first segment and the second segment, and a heightened segment is added between the first segment and the second segment. Step b is added between the second step and the third step above,

Step b, hoist the heightening section, move the temporary jack to the top surface of the first section, hoist the heightening section, insert the connecting steel bars into the pipeline embedded in the heightening section, and temporarily fix it on the heightening section Support the heightened segment on the temporary jack, and adjust the space position of the heightened segment through the temporary jack; release the temporary fixation of the connecting steel bar on the top of the heightened segment, and lower the connecting steel bar to the joint with the top of the first segment The head of the connecting steel bar at the top of the first segment and the connecting steel bar at the bottom of the heightened segment are mechanically connected and fixed one-to-one, lay epoxy glue on the top of the first segment, remove the temporary jack, and lower it to increase the height. segment, the shear key at the top of the first segment is in one-to-one correspondence with the shear keyway at the bottom of the heightened segment, and the heightened segment is extruded and fixed to the first segment. The fixed connection between the heightened segment and the first segment is realized by extrusion through the extrusion groove;

The third step becomes: hoisting the second section, moving the temporary jack to the top surface of the heightened section, hoisting the second section, threading the connecting steel bar into the pipeline embedded in the second section, and temporarily fixing it on the The top of the second segment; support the second segment on the temporary jack, and adjust the space position of the second segment through the temporary jack; release the temporary fixation of the connecting steel bar on the top of the second segment, and lower the connecting steel bar to the height of the second segment. For the position of the joint at the top of the segment, connect the head of the connecting steel bar at the top of the heightened segment with the connecting steel bar at the bottom of the second segment one-to-one mechanical connection and fix it, lay epoxy glue on the top of the heightened segment, and remove the temporary jack , lower the second segment, and match the shear key at the top of the heightened segment with the shear keyway at the bottom of the second segment. The second segment is extruded and fixed with the heightened segment. , the excess colloid is extruded through the extrusion groove to realize the fixed connection between the second segment and the heightened segment.

The beneficial effects of the invention are as follows: the connection structure has large construction tolerance and low precision requirements, can be applied to multi-segment and large-section bridge pier assembly, has strong cross-section shear resistance and low cost; It has strong energy capacity, which can make the prefabricated assembled pier suitable for the seismic demand of high seismic area, reduce the residual displacement, and is beneficial to the post-earthquake repair of the assembled pier.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the exploded structure schematic diagram of the present invention;

Figure 3 is a top plan view of the first segment of the present invention;

Figure 4 is a top plan view of the second segment of the present invention;

Fig. 5 is the structural representation of shear key of the present invention;

Figure 6 is a schematic structural diagram of the present invention before the first segment is connected to the base;

7 is a schematic structural diagram of the construction process of the connection between the first segment and the base of the present invention;

FIG. 8 is a schematic structural diagram of the first section and the second section of the present invention before construction;

Fig. 9 is the structural schematic diagram of the prestressed beam construction process of the present invention;

Figure 10 is a schematic view of the structure of the heightened segment of the present invention;

Figure 11 is a schematic structural diagram of the present invention after adding a heightened section.

Among them: 1. pier column; 2. base; 3. first segment; 23. first joint; 4. second segment; 34. second joint; 5. connecting steel bar; 6. corrugated pipe tunnel ; 7. Prestressed beam; 8. Steel pipe; 9. Joint reinforcement; 10. Extrusion groove; 11. Shear key; 12. Grouting pipe; 13. Shear keyway; 14. Rebar anchor bolt; Backing plate; 16. Prestressed grouting pipe; 17. Elevated section; 18. Temporary jack; 19. Prestressed grouting; 20. Grouting; 21. Mechanical connection.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-9, a connection structure for segmental prefabricated pier combination has a pier 1 and a base 2. The pier 1 is located above the base 2 and is fixedly connected to the base 2. The pier The column 1 is composed of a first segment 3 and a second segment 4. The bottom of the first segment 3 and the base 2 are spliced and connected by a first seam 23, and the top of the first segment 3 and the second segment 4 are connected. The bottom is spliced and connected by the second seam 34, the first section 3 and the second section 4 are respectively pre-buried pipelines, and the corrugated pipe holes 6 pass through the connecting steel bars 5 in the pipes, and the corrugated pipe holes 6 are provided with continuations. The connecting steel bars 5 are fixed by mechanical connection 21 between the connecting steel bars 5, and one end of the connecting steel bars 5 passes through the corrugated pipe tunnel at the top of the second section 4 through the cooperation of the steel bar anchor bolts 14 and the steel bar anchor pads 15 and the second section. The top of the section 4 is fixedly connected, and the other end passes through the bottom of the bellows tunnel in the first section 3 and the top of the base 2 is provided with a joint steel bar 9 to be fixed by a mechanical connection 21, and the steel pipe 8 passes through the prestressed bundle 7 in the pipeline, One end of the prestressed bundle 7 is stretched from the top of the pre-embedded steel pipe 8 in the second section 4, and the other end is protruded from the bottom of the pre-embedded steel pipe 8 in the first section 3 and anchored to the base 2. The positions of the pre-buried corrugated pipe ducts 6 in the section 3 and the second section 4 are in one-to-one correspondence, and the positions of the first section 3 and the pre-buried steel pipes 8 in the second section 4 are in a one-to-one correspondence. The pre-buried corrugated pipe holes 6 in a section 3 correspond to the positions of the joint reinforcement bars 9 provided on the top of the base 2, and the bottoms of the first section 3 and the second section 4 are respectively provided with extrusion grooves 10. , the top of the first segment 3 is pre-set with a shear key 11, the lower side wall of the first segment 3 is pre-set with a grouting pipe 12, and the bottom of the second segment 4 is provided with a shear key groove 13. The shear force keyway 13 is used in conjunction with the shear force key 11. The position of the shear force keyway 13 corresponds to the shear force key 11 provided at the top of the first segment. Matching, the steel pipe 8 is embedded in the base 2, the steel pipe 8 embedded in the base 2 and the steel pipe 8 embedded in the first segment 3 are in one-to-one correspondence, and the other end of the prestressing bundle 7 passes through the first section 3. The steel pipe 8 embedded in a section 3 and the steel pipe 8 embedded in the base 2 are anchored at the end of the steel pipe 8 embedded in the base 2. The base 2 is provided with a prestressed grouting pipe 16, and the prestressed pressure The slurry pipe 16 is communicated with the steel pipe 8 embedded in the base 2. The base 2 is a cast-in-place base. The joint steel bars 9 provided on the top of the base 2 are different in length. The diameter of 5 is 2-5cm larger.

The shear key 11 is in the shape of a truncated cone, the vertical section of the shear key 11 is an isosceles trapezoid, the angle between the hypotenuse and the bottom edge of the trapezoid is 45°, and the shear key 11 and the shear keyway 13 mesh between.

The glue extrusion tank 10 is located at the bottom of the first section 3 and the second section 4 respectively, and the first section 3 and the second section 4 are respectively divided into a plurality of areas. The horizontal cross section of the glue extrusion tank 10 is: Square or rectangle, the side length is 2-10cm, when the bottom of the first section 3 and the second section 4 are respectively provided with two extrusion grooves 10, the bottom of the first section 3 and the second section 4 are equally divided for three regions.

As shown in FIGS. 10 and 11 , when multiple segments are used, a heightened segment 17 is added between the first segment 3 and the second segment 4 , and the corrugations provided in the heightened segment 17 are The positions of the pipe holes 6 and the steel pipes 8 correspond to the positions of the corrugated pipe holes 6 and the steel pipes 8 in the first section 3 and the second section 4, respectively, and the bottom structure of the heightened section 17 corresponds to the second section. The structure of the bottom is the same, and the structure of the top of the raised section is the same as that of the top of the first section.

The raised sections 17 may be plural.

The specific steps for implementing the above structure are as follows:

Step 1, cast the base 2 on site, the first segment 3 and the second segment 4 are prefabricated in the factory;

Step 2: When hoisting the first section 3, insert the connecting steel bar 5 into the bellows tunnel 6 embedded in the first section, and temporarily fix it on the top of the first section 3; support the first section 3 on the temporary On the jack 18, the spatial position of the first segment 3 is adjusted by the temporary jack 18; then the temporary fixation of the connecting steel bar 5 is released, the connecting steel bar 5 is lowered to the joint position, and the connecting steel bar 5 and the connecting steel bar 9 are in one-to-one correspondence and are mechanically connected 21 is fixed, and the top surface area of the base 2 is chiseled, the mortar cushion is laid, the temporary jack 18 is removed, and the first section 3 is lowered for installation by the slurry method. The connection between the first segment 3 and the base 2;

Step 3: When hoisting the second section 4, move the temporary jack 18 to the top surface of the first section 3, hoist the second section 4, and insert the connecting steel bar 5 into the pre-buried corrugated pipe hole 6 of the second section 4. and temporarily fix it on the top of the second segment 4; support the second segment 4 on the temporary jack 18, and adjust the spatial position of the second segment 4 through the temporary jack 18; release the connecting steel bar 5 on the second segment 4 Temporarily fix the top, and lower the connecting bar 5 to the position where it is connected to the top of the first segment 3, and make a one-to-one correspondence between the head of the connecting bar 5 at the top of the first segment 3 and the connecting bar 5 at the bottom of the second segment 4 And fixed by mechanical connection 21, lay epoxy glue on the top of the first segment 3, remove the temporary jack 18, lower the second segment 4, and connect the shear key 11 provided on the top of the first segment 4 with the second segment. The shear key grooves 13 provided at the bottom of the segment 4 are in one-to-one correspondence. The second segment 4 is installed and fixed with the first segment 3 by the extrusion method. Fixed connection between the first segment 3;

Step 4. After the assembly of each segment is completed, clean the slurry of the glue extrusion tank 10, and fill the joints after the cleaning is completed;

Step 5, pour the grouting material 20 into the pipeline where each connecting steel bar is located through the grouting pipe 12, and anchor the connecting steel bar 5 in the prefabricated segment;

Step 6: Fix one end of the connecting steel bar 5 on the top of the second segment 4;

Step 7. When setting the prestressed bundle 7, insert the prestressed bundle 7 into the embedded steel pipe 8 from the top of the second segment 4, and when penetrating into the base 2, connect the prestressed bundle 7 to the base through the anchoring structure. The seat 2 is anchored and connected, and the prestressed bundles 7 are pulled one by one from the top of the second segment 4. When the bonding prestress is used, the prestressed grouting slurry 19 is poured into the prestressed bundle 7 through the prestressed grouting pipe 16. In the penetrating pre-buried steel pipe 8;

Step 8. After all the above slurry maintenance is completed, remove the grouting pipe 12 and the prestressed grouting pipe 16 located outside the structure to complete the construction.

When multiple segments are used, a heightened segment 17 is added between the first segment 3 and the second segment 4, and step b is added between the second step and the third step above,

Step b. When the heightening section 17 is hoisted, the temporary jack 18 is moved to the top surface of the first section 3, the heightening section 17 is hoisted, and the connecting steel bar 5 is inserted into the corrugated pipe hole 6 embedded in the heightening section 17. and temporarily fixed on the top of the heightened segment; the heightened segment 17 is supported on the temporary jack 18, and the spatial position of the heightened segment 17 is adjusted through the temporary jack 18; Temporarily fix, lower the connecting steel bar 5 to the position where it is connected to the top of the first segment 3, and make a one-to-one correspondence between the head of the connecting steel bar 5 at the top of the first segment 3 and the connecting steel bar at the bottom of the heightened segment 17 and mechanically Connection 21 is connected, epoxy glue is laid on the top of the first segment 3, the temporary jack 18 is removed, the heightened segment 17 is lowered, and the shear key 11 provided on the top of the first segment 3 is connected with the heightened segment 17. The shear key grooves 13 provided at the bottom correspond one by one, the heightened segment 17 is installed and fixed with the first segment 3 by extrusion method, and the excess colloid is extruded through the extrusion groove to realize the heightened segment 17 and the first segment. fixed connections between sections 3;

The third step becomes: hoisting the second section, moving the temporary jack 18 to the top surface of the heightening section 17, inserting the connecting steel bar 5 into the bellows hole 64 embedded in the second section 4, and temporarily fixing it On the top of the second section; support the second section on the temporary jack 18, adjust the spatial position of the second section 4 through the temporary jack 18; release the temporary fixation of the connecting steel bar 5 on the top of the second section, and put the connecting steel bar 5 is lowered to the position where it is connected to the top of the heightened segment 17, and the head of the connecting steel bar 5 at the top of the heightened segment 17 is in one-to-one correspondence with the connecting steel bar 5 at the bottom of the second segment 4 and fixed by the mechanical connection 21. Lay epoxy resin glue on the top of the high segment 17, remove the temporary jack 18, lower the second segment 4, and connect the shear key 11 provided on the top of the heightened segment 17 with the shear key groove provided at the bottom of the second segment. 13 One-to-one correspondence, the second segment 4 is installed and fixed with the heightened segment 17 by extrusion method, and the excess colloid is extruded through the extrusion groove 10 to realize the fixed connection between the second segment 4 and the heightened segment 17 .

By adopting the above structure and construction method, the steel bars between the segments are connected reliably, the quality is easy to control, and the joints on the same section can be staggered from each other. The lower part of the steel bar of the bridge pier extends into the base, and the upper part is reinforced by the anchor plate. The connection and anchoring of the steel bar are reliable, which ensures the connection performance between the segments of the prefabricated pier. It overcomes the defects of incomplete hysteresis curve and insufficient energy consumption of prestressed assembled piers, which makes this scheme suitable for high seismic areas, and provides a solution for the application of prefabricated assembled piers in high seismic areas.

In order to reduce the weight of large-sized solid section segments, the segments can be made of lightweight concrete. Under the premise of meeting the strength and stiffness requirements of segment-assembled piers, the weight of the segments is reduced, which is convenient for transportation and hoisting.

The steel bars are in the form of pre-embedded corrugated pipe channels, with large construction tolerance and low precision requirements, and the on-site steel bars are easy to penetrate. Site construction.

The section of the pier body is equipped with a glue extrusion groove, and the construction is carried out by the method of grouting in separate warehouses, which is conducive to ensuring the compactness of the joint surface and the construction quality, and effectively solves the problem of connection between the sections of large-sized piers. When two glue extrusion grooves are set, the pier section is It is divided into three areas. When using grouting construction, ensure that each area is glued in four directions to ensure the quality and compactness of the joint cementing material; This leads to problems such as hollowing and non-compactness of the seating surface, which affects the quality of the joint surface.

The circular truncated shear key is set between the segments. The shear area of the shear key is equal in all directions, and the shear resistance provided by the shear key is equivalent, which can meet the shear resistance requirements when earthquakes act in different directions. The strength of shear resistance varies, which is unfavorable for resisting earthquakes in different directions; the shear key is in the shape of a truncated cone, which reduces the local concentrated stress on the shear key, and the arc surface shape reduces the bending moment on the shear key. Ensure that the shear key is mainly shear resistant to prevent the shear key from losing its resistance due to bending damage prematurely.

During the segment assembly process, a temporary jack is set to accurately adjust the three-dimensional space position of the segment. When the segment is supported on the temporary jack, the elevation and plane position of the segment are adjusted in time through pre-assembly. The temporary jack is supported on the bottom surface of the segment. It does not occupy external space, does not need to set embedded parts on the segments, and is easy to install and dismantle, ensuring the precise assembly of the segments.

A small number of prestressed beams can be set inside the segment as required. The prestressed pressure provided by the prestressed beams ensures that the joints will not crack under normal working conditions and improve the durability of the joints. At the same time, the prestressed beams can be made of non-bonded When the pier swings under the action of an earthquake, the restoring force provided by the prestressed beam can restore the pier to its original position, thereby reducing the residual displacement, which is beneficial to the post-earthquake repair of the assembled pier and avoids the pier Although it did not collapse, it had to be demolished and rebuilt because it could not be repaired.

Claims (10)

1. A connection structure for the combination of segmental prefabricated piers, comprising a pier column and a base, and the pier column is located above the base and is fixedly connected with the base, and is characterized in that: the pier column is composed of a first segment. , the second section is composed, the bottom of the first section is connected with the base, the top of the first section is connected with the bottom of the second section, the first section and the second section are respectively pre-buried pipes, The bottoms of the first segment and the second segment are respectively provided with extrusion grooves, the top of the first segment is preset with a shear key, and the lower side wall of the first segment is preset with a grouting pipe , the bottom of the second segment is provided with a shear force keyway, the shear force keyway is used in conjunction with the shear force key, and the position of the shear force keyway corresponds to the shear force key provided at the top of the first segment. The shape and size match the shear key; the part of the pipeline is provided with a prestressed bundle, one end of the prestressed bundle is stretched from the top of the pre-embedded pipeline in the second segment, and the other end is from the bottom of the pre-embedded pipeline in the first segment. The outlet is anchored to the base; the other part of the pipeline is provided with continuous connecting steel bars, and the connecting steel bars are fixed by mechanical connection, and one end of the connecting steel bars is located on the top of the second section and is fixedly connected with the top of the second section , the other end of the connecting steel bar passes through the pipe from the bottom of the first segment and is mechanically connected and fixed with the joint steel bar provided on the top of the base. 2. A connection structure for segment prefabricated and assembled bridge pier combination according to claim 1, characterized in that: a part of the pipelines embedded in the first segment and the second segment are corrugated pipe tunnels, and the other A part of the pipelines are steel pipes, connecting steel bars are pierced in the corrugated pipe ducts, prestressed bundles are pierced inside the steel pipes, and grouting material is poured into the bellows pipe ducts. 3. A connection structure for segmental prefabricated and assembled bridge pier combination according to claim 1 or 2, characterized in that: the pre-buried bellows tunnels and steel pipe positions in the first segment and the second segment One-to-one correspondence, the pre-buried corrugated pipe holes in the first section correspond to the positions of the joint steel bars provided on the top of the base, and one end of the mechanically fixed connecting steel bars passes through the corrugated pipe holes at the top of the second section, and passes through the corrugated pipe holes at the top of the second section. The cooperation of the steel bar anchor bolt and the steel bar anchor plate is fixedly connected with the top of the second section, and the other end of the connecting steel bar passes through the bottom of the corrugated pipe tunnel in the first section and is mechanically connected with the top of the base with a joint steel bar. The diameter of the corrugated pipe is 2-5cm larger than the diameter of the connecting steel bar. 4. A connection structure for segmental prefabricated and assembled bridge pier combination according to claim 3, characterized in that: the steel pipe pre-buried in the base, the steel pipe pre-buried in the base and the pre-buried steel pipe in the first segment The positions of the buried steel pipes correspond one by one, and the other end of the prestressed bundle passes through the steel pipes embedded in the first segment and the steel pipes embedded in the base, and is anchored at the ends of the steel pipes embedded in the base. A prestressed grouting pipe is provided, and the prestressed grouting pipe communicates with the steel pipe embedded in the base. 5 . The connection structure for segmental prefabricated and assembled bridge piers according to claim 1 or 3 , wherein the base is a cast-in-place base, and the lengths of the joint reinforcement bars provided on the top of the base are different. 6 . 6. A connection structure for segment prefabricated pier assembly according to claim 1, characterized in that: the shear key is in the shape of a truncated cone, the vertical section of the shear key is an isosceles trapezoid, and the trapezoid The included angle between the hypotenuse and the base is 45°, and the shear key is engaged with the shear keyway. 7. A connection structure for segmental prefabricated and assembled bridge pier combination according to claim 1, characterized in that: the extrusion grooves are located at the bottoms of the first segment and the second segment respectively, and the first segment The section and the second section are respectively divided into a plurality of areas, and the horizontal cross section of the extrusion groove is square or rectangular, and the side length is 2-10cm. 8 . The connection structure for segment prefabricated and assembled bridge pier combination according to claim 1 , wherein a heightened segment is arranged between the first segment and the second segment, and the heightened segment is provided between the first segment and the second segment. 9 . The positions of the corrugated pipe holes and steel pipes provided in the high section correspond to the positions of the corrugated pipe holes and steel pipes provided in the first section and the second section respectively, and the bottom structure of the heightened section corresponds to the second section. The structure of the bottom of the segment is the same, and the structure of the top of the raised segment is the same as that of the top of the first segment. 9. The construction method for the connection structure of the segmental prefabricated assembled bridge pier combination according to claim 1, characterized in that: having the following steps Step 1. The base is cast on site, and the first segment and the second segment are prefabricated in the factory; Step 2, hoist the first segment, insert the connecting steel bar into the pre-buried pipeline of the first segment, and temporarily fix it on the top of the first segment; support the first segment on the temporary jack, and adjust the segment through the temporary jack. Then release the temporary fixation of the connecting steel bars, lower the connecting steel bars to the joint position, and fix the connecting steel bars and the connecting steel bars in one-to-one correspondence mechanically, and chisel the top area of the base, lay a mortar cushion, and remove the temporary Jack, lower the first section for installation by slurry sitting method, and the excess slurry is extruded through the extrusion groove to realize the connection between the first section and the base; Step 3: Hoist the second segment, move the temporary jack to the top surface of the first segment, hoist the second segment, insert the connecting steel bar into the pre-buried pipeline of the second segment, and temporarily fix it on the second segment Support the second segment on the temporary jack, adjust the space position of the second segment through the temporary jack; release the temporary fixation of the connecting steel bar on the top of the second segment, and lower the connecting steel bar to the joint with the top of the first segment The head of the connecting steel bar at the top of the first segment and the connecting steel bar at the bottom of the second segment are mechanically connected and fixed one-to-one, lay epoxy glue on the top of the first segment, remove the temporary jack, and lower the second segment. segment, the shear key provided at the top of the first segment is in one-to-one correspondence with the shear key groove provided at the bottom of the second segment, the second segment is installed and fixed with the first segment by extrusion method, and the excess The fixed connection between the second segment and the first segment is realized by extrusion through the extrusion groove; Step 4. After the assembly of each segment is completed, clean the slurry of the extrusion tank, and fill the seam after the cleaning is completed; Step 5, pouring the grouting slurry into the pipeline where each connecting steel bar is located through the grouting pipe, and anchoring the connecting steel bar in the prefabricated segment; Step 6. Fix one end of the connecting steel bar on the top of the second segment; Step 7. When setting the prestressed bundle, insert the prestressed bundle into the embedded pipeline from the top of the second segment, and when it penetrates into the base, anchor the prestressed bundle to the base through the anchoring structure, and The top of the second segment pulls the prestressed bundles one by one, and when bonding prestressing is used, the prestressed compressive slurry is poured into the embedded pipeline through which the prestressed bundles pass; Step 8. After all the above slurry maintenance is completed, remove the grouting pipeline outside the structure to complete the construction. 10. The construction method for the connection structure of segment prefabricated pier combination according to claim 9, characterized in that: when multiple segments are used, between the first segment and the second segment Add a heightened segment, and add step b between the second step and the third step above, Step b, hoist the heightening section, move the temporary jack to the top surface of the first section, hoist the heightening section, insert the connecting steel bars into the pipeline embedded in the heightening section, and temporarily fix it on the heightening section Support the heightened segment on the temporary jack, and adjust the space position of the heightened segment through the temporary jack; release the temporary fixation of the connecting steel bar on the top of the heightened segment, and lower the connecting steel bar to the joint with the top of the first segment The head of the connecting steel bar at the top of the first segment and the connecting steel bar at the bottom of the heightened segment are mechanically connected and fixed one-to-one, lay epoxy glue on the top of the first segment, remove the temporary jack, and lower it to increase the height. segment, the shear key at the top of the first segment is in one-to-one correspondence with the shear keyway at the bottom of the heightened segment, and the heightened segment is extruded and fixed to the first segment. The fixed connection between the heightened segment and the first segment is realized by extrusion through the extrusion groove; The third step becomes: hoisting the second section, moving the temporary jack to the top surface of the heightened section, hoisting the second section, threading the connecting steel bar into the pipeline embedded in the second section, and temporarily fixing it on the The top of the second segment; support the second segment on the temporary jack, and adjust the space position of the second segment through the temporary jack; release the temporary fixation of the connecting steel bar on the top of the second segment, and lower the connecting steel bar to the height of the second segment. For the position of the joint at the top of the segment, connect the head of the connecting steel bar at the top of the heightened segment with the connecting steel bar at the bottom of the second segment one-to-one mechanical connection and fix it, lay epoxy glue on the top of the heightened segment, and remove the temporary jack , lower the second segment, and make one-to-one correspondence between the shear key at the top of the heightened segment and the shear keyway at the bottom of the second segment. , the excess colloid is extruded through the extrusion groove to realize the fixed connection between the second segment and the heightened segment.

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