CN116377844A - A prefabricated bridge pier connected by self-locking large-diameter steel bars and its construction method - Google Patents

Abstract

A prefabricated pier connected by self-locking large-diameter steel bars comprises a bearing platform, a prefabricated pier body, a prefabricated capping beam, common steel bars, grouting materials, self-locking anchorage devices, large-diameter steel bars, a steel backing plate, screw caps and corrugated pipes; corrugated pipes are arranged in the bearing platform, the prefabricated pier body and the prefabricated capping beam, and self-locking anchorage devices are buried below the corrugated pipes in the bearing platform; the steel backing plate sets up the lower extreme at the major diameter reinforcing bar, thereby the steel backing plate passes from locking-type ground tackle anchor the lower extreme with the major diameter reinforcing bar, and the major diameter reinforcing bar passes cushion cap, prefabricated pier shaft, prefabricated bent cap in the bellows with cushion cap, prefabricated pier shaft and prefabricated bent cap connection, thereby the upper end coupling nut of major diameter reinforcing bar anchors the upper end of major diameter reinforcing bar. And also relates to a construction method of the prefabricated pier connected by the self-locking large-diameter steel bars. The invention adopts large-diameter steel bars to penetrate through the whole pier structure, and connects the bearing platform, the pier column and the capping beam which are independently manufactured into a system, thereby achieving the aim of integral stress and belonging to the technical field of bridge engineering.

Description

A prefabricated bridge pier connected by self-locking large-diameter steel bars and its construction method

technical field

The invention relates to the technical field of bridge engineering, in particular to a prefabricated bridge pier connected by self-locking large-diameter steel bars and a construction method thereof.

Background technique

The traditional bridge pier construction mostly adopts the method of on-site integral pouring, which has a long construction period and is likely to cause traffic congestion and environmental pollution on the site. In recent years, due to the guaranteed quality of prefabricated components, on-site construction operations are reduced, and the impact on the environment is small. It meets the development planning requirements of my country's "double carbon" goal of the construction industry, and has broad application prospects in bridge construction.

The prefabricated bridge pier is formed by dividing the whole pier (mainly including the cap, pier body, and cover beam) into several components, which are prefabricated separately and then spliced on site. The connection between components is the most critical factor affecting the overall stress and seismic performance of fabricated bridge piers. At present, the most commonly used method in engineering is the grouting sleeve connection, which is to pre-embed the sleeves inside the pier columns, and separate them when splicing. The reinforcement of the component is inserted into the sleeve, and grouting is performed from the reserved nozzle. In actual engineering, the number of longitudinal steel bars in the pier column is large, and the accuracy of the alignment with the sleeve is high, so the construction is difficult; the steel bars between the components are not connected, and the force transmission is completed by the bonding force between the grouting material and the steel bars However, the sleeve is a concealed project. If the grout leaks or the grouting is not enough, it will easily cause safety hazards.

Some scholars have proposed to use prestressed tendons to connect prefabricated bridge piers. The prestressed connection method can increase the self-resetting ability of bridge piers, which is very beneficial to the seismic performance of bridge piers. However, the anchorage of prestressed tendons is a technical difficulty. Traditional prestressed anchors It needs to use clips and apply mechanical force for anchoring, which is difficult to implement in fabricated bridge piers. Therefore, convenient and reliable anchoring devices suitable for fabricated bridge piers are urgently needed to be developed.

Contents of the invention

Aiming at the technical problems existing in the prior art, the object of the present invention is to provide a self-locking prefabricated bridge pier connected by large-diameter steel bars that is easy to assemble and has better overall stress performance and its construction method.

In order to achieve the above object, the present invention adopts following technical scheme:

A prefabricated bridge pier connected by self-locking large-diameter steel bars, including caps, prefabricated pier bodies, prefabricated cap beams, ordinary steel bars, and grouting materials. Common steel bars are arranged in the prefabricated pier bodies. The prefabricated bridge piers also include self-locking anchors, large-diameter Reinforcement bars, steel backing plates, nuts, bellows; bellows are installed in caps, prefabricated pier bodies and prefabricated cover beams, and self-locking anchors are buried under the bellows in caps; steel backing plates are set in large-diameter The lower end of the steel bar, the steel backing plate passes through the self-locking anchor to anchor the lower end of the large-diameter steel bar, and the large-diameter steel bar passes through the cap, the prefabricated pier body, and the bellows in the prefabricated cap beam to connect the cap, the prefabricated pier body and the The prefabricated cap-beam connection, after stretching the large-diameter steel bars, tighten the nuts to apply prestress to the assembled pier; inject grout from the grouting hole, and fill the bellows.

As a preference, the bellows include bellows I with a diameter of _D1 and bellows II with a diameter of _D2 , where _D2 is greater than _D1 , and the bellows I are set in the prefabricated pier body and the prefabricated cap beam, and the bellows II are set In the bearing platform; the steel backing plate is socketed and fixed on the lower end of the large-diameter steel bar, and the outer diameter of the steel backing plate is less than D ₂ ; the self-locking anchor includes a ring frame, a bayonet, a spring, a protective cover, and a ring of the ring frame The inner wall of the shape is provided with a plurality of retraction grooves arranged in the circumferential direction to accommodate the bayonet pins; the retraction grooves, springs, and bayonet pins are set in one-to-one correspondence; the bayonet pins are connected in the retraction grooves through springs, and the bayonet pins are Protrude from the retraction groove, and retreat into the retraction groove under the action of external force; the inner upper end of the bayonet is provided with an inclined part inclined from the inner bottom to the outer upper part, and the inclined part is used as a force bearing surface to bear the pressure of the steel backing plate; The ring frame is arranged inside the protective cover.

As a preference, the number of detents is at least four, which are evenly distributed on the circumference of the plane.

As a preference, the protective cover is connected to the bellows II, and the seam connection is sealed.

As a preference, large-diameter steel bars are arranged around the prefabricated pier body, and at least one large-diameter steel bar is arranged at each corner of the prefabricated pier body.

As a preference, the prefabricated pier body adopts one-section prefabrication or prefabricated in sections; when prefabricated in sections, corrugated pipes are arranged in each section of the prefabricated pier body, and the large-diameter steel bars pass through each section of the corrugated pipe to connect each section of the prefabricated pier body. connect.

As a preference, the large-diameter steel bar is a one-stage structure or a multi-stage structure; when a multi-stage structure is adopted, each large-diameter steel bar is connected by a sleeve connector, and threaded sections are arranged at both ends of each large-diameter steel bar.

As a preference, shallow grooves are arranged on the top of the prefabricated cover beam, and the nuts are located in the shallow grooves. After the large-diameter steel bars are stretched by a jack, the nuts are tightened to apply pre-tightening force to the large-diameter steel bars.

A construction method for prefabricated bridge piers connected by self-locking large-diameter steel bars, comprising the following steps: (1) making self-locking anchors, pouring caps, pre-embedding self-locking anchors and corrugated pipes; prefabricating the pier body, Prefabricated corrugated pipes; prefabricated cap beams, prefabricated corrugated pipes; (2) Prefabricated pier bodies and prefabricated cap beams are transported to the site for hoisting and splicing: the prefabricated pier bodies are placed horizontally, and large-diameter steel bars are inserted into the corrugated pipes of the prefabricated pier bodies And protrude from the bottom, install the steel backing plate, and temporarily fix the large-diameter steel bar; lift the prefabricated pier body to a vertical state and align it, release the temporary fixation of the large-diameter steel bar, and insert the large-diameter steel bar into the self-locking anchor Inside, steel backing plates and self-locking anchors form self-locking; after the grouting material reaches strength, hoist the cover beam, align the cover beam with the prefabricated pier body, and insert large-diameter steel bars into the bellows of the cover beam; (3) Tension Large-diameter steel bars and grouting: On the top of the cover beam, screw the nuts into the upper end of the large-diameter steel bars, use a jack to stretch the large-diameter steel bars, and lock the nuts; pour grout with good fluidity from the bottom of the bellows to the top material until full.

As a preference, in step (1), when the cap is poured, the top nozzle of the bellows is higher than the surface of the cap and temporarily closed; when the pier body is prefabricated, the nozzle of the bellows is temporarily closed, and the bottom of the bellows protrudes Length L≥100mm; when prefabricating the cap beam, the top nozzle of the bellows is higher than the cap surface, and the bellows nozzle is temporarily closed; in step (2), lay the sitting slurry on the contact surface between the cap and the prefabricated pier body The grout is laid on the contact surface of the prefabricated pier body and the prefabricated cover beam; the grouting hole is reserved for the corrugated pipe at the bottom of the pier column, and after the pre-tightening force is applied to the large-diameter steel bar, the corrugation is adjusted from bottom to top in the grouting hole. Pipes are grouted.

The principle of the present invention is: use large-diameter steel bars to penetrate the prefabricated pier body and prefabricated cover beams, and form a whole force on each component of the assembled bridge pier; Prestressing is applied to the diameter steel bar to improve the seismic performance of the pier column; the high strength and large area of the large diameter steel bar are used to reduce the number of holes reserved for splicing in the components and facilitate construction.

The present invention has the following advantages:

1. Large-diameter steel bars are used to run through the entire bridge pier structure, and the independently produced caps, pier columns and cover beams are connected into a system to achieve the purpose of overall force bearing.

2. Utilizing the high strength and large area of large-diameter steel bars, compared with ordinary stressed steel bars, the number of steel bars is reduced under the same stress, thereby reducing the number of preset holes in each component, and the splicing construction is simple and fast.

3. Use self-locking anchors to anchor the ends of large-diameter steel bars; apply prestress to large-diameter steel bars to improve the crack resistance of bridge piers, enhance the self-resetting ability of pier tops, and improve the seismic performance of pier columns.

4. The self-locking anchorage is pre-embedded in the cap, and the large-diameter steel bar is directly inserted to realize self-locking and reliable anchoring, which reduces the construction difficulty of prestressed tendon penetration and speeds up construction efficiency.

Description of drawings

Fig. 1 is a schematic elevation view of a prefabricated bridge pier connected by self-locking large-diameter steel bars.

Fig. 2 is a sectional view of the prefabricated pier A-A in Fig. 1 .

Fig. 3 is a partially enlarged elevation view of the connection between the self-locking anchorage and the large-diameter steel bar at B in Fig. 1 .

Fig. 4 is a partially enlarged top view of the connection between the self-locking anchor and the large-diameter steel bar in Fig. 3 .

Fig. 5 is a schematic diagram of the components of the prefabricated bridge pier before assembly.

Fig. 6 is a structural elevation view of the self-locking anchor.

Fig. 7 is a top view of the structure of the self-locking anchor in Fig. 6 .

1 is cap, 2 is prefabricated pier body, 3 is prefabricated cover beam, 4 is self-locking anchor, 5 is large diameter steel bar, 6 is nut, 7 is ordinary steel bar, 8 is bellows I, 9 is corrugated Pipe II, 10 is the grouting material, 11 is the grouting hole, 12 is the shallow groove, 13 is the ring frame, 14 is the bayonet pin, 15 is the spring, 16 is the protective cover, 17 is the steel backing plate, 18 is the retreat groove, 19 is an inclined part.

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments.

A prefabricated bridge pier connected by self-locking large-diameter steel bars, including caps, prefabricated pier bodies (also known as prefabricated pier columns), prefabricated cover beams, ordinary steel bars, grouting materials, self-locking anchors, large-diameter steel bars, steel Backing plates, nuts, bellows; bellows are installed in caps, prefabricated pier body and prefabricated cover beams, and self-locking anchors are buried under the bellows in caps; steel backing plates are set at the lower end of large-diameter steel bars , the steel backing plate passes through the self-locking anchor to anchor the lower end of the large-diameter steel bar, and the large-diameter steel bar passes through the cap, the prefabricated pier body, and the bellows in the prefabricated cover beam to connect the cap, the prefabricated pier body and the prefabricated cover beam After connecting and stretching the large-diameter steel bar, tighten the nut to apply prestress to the assembled pier; inject grout from the grouting hole, and fill the bellows.

The longitudinal reinforcement of prefabricated piers consists of two parts: large-diameter steel bars and ordinary steel bars, with diameters d ₁ and d ₂ respectively, among which the large-diameter steel bars are arranged around the pier columns, and the number depends on the force of the pier columns. At least one of them should be placed at the corner of each corner; large-diameter steel bars should be high-strength steel bars above HRB500, or precision-rolled rebar, with a diameter _d1 of 32-50mm; when the steel bars are long, sleeve connectors can be used to connect them. , Both ends of the large-diameter steel bar are threaded to form a threaded section.

When the pier column is prefabricated, the corrugated pipe I is pre-embedded at the position of the large-diameter steel bar, and the diameter is D ₁ . Phase socket. Ordinary longitudinal reinforcements are evenly arranged around the pier columns, mainly for crack resistance. The grade should be HRB400, and the diameter d ₂ ≤ 25mm. The design and fabrication requirements of the ordinary longitudinal reinforcement and stirrup of the pier column are the same as those of the conventional pier column. When the pier column is high, it can be prefabricated in sections.

When the cap is poured, the corrugated pipe II corresponding to the large-diameter steel bar of the pier column and the self-locking anchorage are pre-embedded inside the cap, and the self-locking anchorage is located at the bottom of the bellows II. The diameter _D2 of the bellows II in the cap is larger than the diameter _D1 of the bellows I in the pier column. In order to prevent the blockage caused by the inflow of cement slurry during the concrete pouring of the cap, the top surface of the bellows is higher than the surface of the cap, and the nozzle is temporarily closed; the lower end of the bellows II is connected with the protective cover, and the joint joint is sealed to prevent the cap from When concrete is poured, grout flows in and causes blockage.

When the cover beam is prefabricated, the bellows I corresponding to the large-diameter steel bar of the pier column are pre-embedded, and the bellows I run through the cover beam, and the diameter of the bellows I is D ₁ . A shallow groove is provided on the top of the cover beam to facilitate the installation of nuts.

The number of pre-embedded corrugated pipes in caps, prefabricated pier columns, and prefabricated cap beams is the same as the number of large-diameter steel bars, and the positions correspond one by one. The diameter D ₂ of the pipe II is larger than the diameter D ₁ of the corrugated pipe I in the pier column, so as to facilitate the passage of the steel backing plate.

The steel backing plate is socketed and fixed on the lower end of the large-diameter steel bar. The outer diameter of the steel backing plate is less than D ₂ ; the self-locking anchor includes a ring frame, a bayonet, a spring, and a protective cover. The circular inner wall of the ring frame is equipped with multiple A circumferentially arranged retraction groove that accommodates the bayonet; the retraction groove, spring, and bayonet pin are set in one-to-one correspondence; the bayonet is connected in the retraction groove through a spring, and the bayonet is released from the retraction groove under the action of the spring. Stretch out and retreat into the retraction groove under the action of external force; the inner upper end of the bayonet is provided with an inclined part inclined from the inner bottom to the outer upper part, and the inclined part is used as a force bearing surface for bearing the pressure of the steel backing plate; the ring frame is set on the protection inside the hood. The number of bayonet pins is at least four, which are evenly distributed on the circumference of the plane. In this example, there are four bayonet pins arranged in a cross shape on a plane. Pass the large-diameter steel bar through the pre-embedded bellows Ⅰ in the pier column, protrude from the bottom of the pier column, install the circular steel backing plate, insert it into the anchorage along the pre-embedded bellows Ⅱ in the cap, Through the spring clip, the steel backing plate at the end of the steel bar is locked to achieve the purpose of self-locking; when the prestress is applied to the top of the large-diameter steel bar, no upward displacement will occur, so as to achieve the anchoring effect. The working mechanism of the self-locking prestressed anchor is that as the large-diameter steel bar is inserted, the circular steel backing plate at the end pushes the bayonet, and the spring inside the anchor retracts, and the bayonet also returns with the spring. Shrink, so that the steel backing plate and steel bars can pass through smoothly. After the steel bar passes through the anchor, the spring drives the bayonet pin to reset, and the bayonet pin plays the role of anchoring the large-diameter steel bar after being reset. The size of the self-locking anchor needs to be determined according to the prestress applied to the large-diameter steel bar, so as to ensure that the steel backing plate can be stuck and not pulled out during the prestressing process.

The prefabricated pier body adopts one-section prefabrication or segmental prefabrication; when segmental prefabrication is performed, bellows are installed in each prefabricated pier body, and large-diameter steel bars pass through each segment of corrugated pipe to connect each segment of prefabricated pier body.

A construction method for prefabricated bridge piers connected by self-locking large-diameter steel bars, comprising the following steps:

(1) Make self-locking anchors, pour caps, pre-embed self-locking anchors and bellows; prefabricate pier body, pre-embed bellows; prefabricate cap beams, pre-embed bellows. Specifically:

Make the reinforced skeleton of the cap, pre-embed the anchorage and corrugated pipe according to the design position, and use short steel bars to connect the anchorage and corrugated pipe with the reinforced skeleton of the cap to fix the position. Seal the joint between the anchorage and the corresponding corrugated pipe with sealant to prevent leakage of slurry into the pipe and cause blockage in the pipe. The mouth of the bellows is higher than the surface of the platform, and the mouth of the bellows is temporarily closed to keep the inside of the bellows clean and unobstructed; the formwork is erected, concrete is poured, and maintenance is performed.

Make the reinforcement cage for the pier column, pre-embed the corrugated pipe, temporarily close the nozzle, extend the corrugated pipe at the bottom of the pier column to a certain length (L≥100mm), set up the formwork, pour concrete, and maintain.

Make the steel bar skeleton of the cover beam, and pre-embed the bellows, whose position corresponds to the bellows in the pier column. The corrugated pipe at the top of the cover beam is higher than the top surface of the cover beam, and the pipe mouth is temporarily closed.

(2) The prefabricated pier body and the prefabricated cover beam are transported to the site for hoisting and splicing: the prefabricated pier body is placed horizontally, the large-diameter steel bar penetrates into the bellows of the prefabricated pier body and protrudes from the bottom, and the steel backing plate is installed, and the large-diameter Temporary fixation of steel bars; hoist the prefabricated pier body in a vertical state and align it, release the temporary fixation of the large-diameter steel bars, insert the large-diameter steel bars into the self-locking anchor, and the steel backing plate and the self-locking anchor form a self-locking ; After the grouting material reaches the strength, the cover beam is hoisted, the cover beam is aligned with the prefabricated pier body, and the large-diameter steel bar is inserted into the bellows of the cover beam. Specifically:

When the pier column is placed horizontally, the large-diameter steel bar is penetrated into the bellows, protruding from the bottom of the pier column, and a circular steel backing plate is installed to temporarily fix the large-diameter steel bar. Cut off the bellows protruding from the cap and keep it flush with the connection interface; chisel the contact surface of the connection, use an air compressor or a vacuum cleaner to clean the dust, and sprinkle water to keep the contact surface wet. Remove the temporary closure of the nozzle, clean the inside of the bellows and the inside of the anchor, and keep it clean and unobstructed.

Lift the pier column into a vertical state, align the corresponding holes, release the temporary fixation of the large diameter, insert the large diameter steel bar into the anchorage to form self-locking, and achieve the anchoring effect.

Lay 2cm thick sitting slurry on the contact surface, slowly lower the pier, adjust the flatness and verticality, position, and temporarily fix the pier.

After the grout reaches its strength (about 48 hours), hoist the cover beam, align the large-diameter steel bars with the holes of the corrugated pipe, and lower it slowly. The splicing of the cover beam is completed in the same way as the splicing steps above.

(3) Stretching large-diameter steel bars and grouting: On the top of the cover beam, screw the nuts into the upper end of the large-diameter steel bars, use a jack to stretch the large-diameter steel bars, and lock the nuts; pour from the grouting hole at the bottom of the bellows from bottom to top Good fluidity grout until full. Specifically:

At the top of the cover beam, screw the nut into the top of the large-diameter steel bar and lock the nut. Use a jack to stretch the large-diameter steel bar.

Fill the grouting material with good fluidity from the bottom to the top of the grouting hole at the bottom of the bellows, and release the jack after filling it hard.

Stretch the remaining large-diameter steel bars and grout in sequence to complete the splicing.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a prefabricated pier of auto-lock major diameter reinforcing bar connection, includes cushion cap, prefabricated pier body, prefabricated bent cap, ordinary reinforcing bar, grouting material, sets up ordinary reinforcing bar, its characterized in that in the prefabricated pier body: the prefabricated pier further comprises a self-locking anchorage device, large-diameter steel bars, a steel backing plate, nuts and corrugated pipes; corrugated pipes are arranged in the bearing platform, the prefabricated pier body and the prefabricated capping beam, and self-locking anchorage devices are buried below the corrugated pipes in the bearing platform; the steel backing plate is arranged at the lower end of the large-diameter steel bar, the steel backing plate penetrates through the self-locking anchorage device so as to anchor the lower end of the large-diameter steel bar, the large-diameter steel bar penetrates through the bearing platform, the prefabricated pier body and the corrugated pipe in the prefabricated capping beam to connect the bearing platform, the prefabricated pier body and the prefabricated capping beam, and after the large-diameter steel bar is tensioned, the screw cap is screwed down to apply prestress to the assembled pier; grouting material is injected from the grouting holes, and the corrugated pipe is filled.

2. A self-locking large-diameter steel bar-connected precast pier according to claim 1, wherein: the bellows comprises a diameter D ₁ Bellows I and diameter D ₂ Bellows II, D of (C) ₂ Greater than D ₁ The corrugated pipe I is arranged in the prefabricated pier body and the prefabricated capping beam, and the corrugated pipe II is arranged in the bearing platform;

the steel backing plate is sleeved and fixed at the lower end of the large-diameter steel bar, and the outer diameter of the steel backing plate is smaller than D ₂ ；

The self-locking anchorage comprises an annular frame, a bayonet lock, a spring and a protective cover, wherein a plurality of rollback grooves which are circumferentially arranged and used for accommodating the bayonet lock are formed in the annular inner wall of the annular frame; the rollback groove, the spring and the bayonet lock are arranged in a one-to-one correspondence; the clamping pin is connected in the retraction groove through a spring, and extends out of the retraction groove under the action of the spring and retracts into the retraction groove under the action of external force; the upper end of the inner side of the bayonet lock is provided with an inclined part which is inclined from the inner lower part to the outer upper part, and the inclined part is used as a stress surface for bearing the lower pressure of the steel backing plate; the annular frame is disposed within the protective cover.

3. A self-locking large-diameter steel bar-connected precast pier according to claim 2, characterized in that: the number of the bayonet locks is at least four, and the bayonet locks are uniformly distributed on the circumference of the plane.

4. A self-locking large-diameter steel bar-connected precast pier according to claim 2, characterized in that: the protective cover is connected with the corrugated pipe II, and the joint of the joint is sealed.

5. A self-locking large-diameter steel bar-connected precast pier according to claim 1, wherein: the large-diameter steel bars are arranged around the prefabricated pier body, and at least one large-diameter steel bar is arranged at each corner of the prefabricated pier body.

6. A self-locking large-diameter steel bar-connected precast pier according to claim 1, wherein: the prefabricated pier body is prefabricated in a one-section mode or in a sectional mode; when the subsection is prefabricated, corrugated pipes are arranged in each section of prefabricated pier body, and large-diameter reinforcing steel bars penetrate through each section of corrugated pipes to connect each section of prefabricated pier body.

7. A self-locking large-diameter steel bar-connected precast pier according to claim 1, wherein: the large-diameter steel bar is of a one-section structure or a multi-section structure; when the multi-section structure is adopted, all sections of large-diameter steel bars are connected through sleeve connectors, and threaded sections are arranged at two ends of each section of large-diameter steel bar.

8. A self-locking large-diameter steel bar-connected precast pier according to claim 1, wherein: the top of the prefabricated bent cap is provided with a shallow groove, a screw cap is positioned in the shallow groove, and after the large-diameter steel bar is tensioned by adopting a jack, the screw cap is screwed down to apply pretightening force to the large-diameter steel bar.

9. A method of constructing a prefabricated pier for connecting large-diameter steel bars according to any one of claims 1 to 8, comprising the steps of:

(1) Manufacturing a self-locking anchor, pouring a bearing platform, and embedding the self-locking anchor and a corrugated pipe; prefabricating a pier body and embedding a corrugated pipe; prefabricating a bent cap and embedding a corrugated pipe;

(2) The prefabricated pier body and the prefabricated capping beam are transported to the site, and are hoisted and spliced: the prefabricated pier body is horizontally placed, large-diameter steel bars penetrate into corrugated pipes of the prefabricated pier body and extend out of the bottoms of the corrugated pipes, steel backing plates are installed, and the large-diameter steel bars are temporarily fixed; lifting the prefabricated pier body to be in a vertical state and aligning, removing temporary fixing of the large-diameter steel bars, inserting the large-diameter steel bars into the self-locking anchor, and forming self-locking by the steel backing plate and the self-locking anchor; after the grouting material reaches the strength, hoisting a capping beam, aligning the capping beam with the prefabricated pier body, and inserting large-diameter steel bars into corrugated pipes of the capping beam;

(3) Stretching large-diameter steel bars and grouting: screwing a nut into the upper end of the large-diameter steel bar at the top of the bent cap, tensioning the large-diameter steel bar by adopting a jack, and locking the nut; grouting from bottom to top from grouting holes at the bottom of the corrugated pipe until the grouting holes are filled with grouting materials with good fluidity.

10. The construction method of the prefabricated pier connected by the self-locking large-diameter steel bars according to claim 9, wherein the construction method comprises the following steps:

in the step (1), when a bearing platform is poured, the pipe orifice at the top of the corrugated pipe is higher than the surface of the bearing platform and is temporarily sealed; when the pier body is prefabricated, the pipe orifice of the corrugated pipe is temporarily sealed, and the extension length L of the bottom of the corrugated pipe is more than or equal to 100mm; when the capping beam is prefabricated, the pipe orifice at the top of the corrugated pipe is higher than the surface of the bearing platform, and the pipe orifice of the corrugated pipe is temporarily sealed;

in the step (2), laying sizing agent on the contact surface of the bearing platform and the prefabricated pier body, and laying sizing agent on the contact surface of the prefabricated pier body and the prefabricated capping beam;

and the corrugated pipe at the bottom of the pier stud is reserved with a grouting hole, and grouting is carried out on the corrugated pipe from the grouting hole from bottom to top after the pretightening force is applied to the large-diameter reinforcing steel bars.

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