A prefabricated bridge pier connection construction method with grouting first

Abstract

The present invention belongs to the technical field of prefabricated bridge assembly, and in particular relates to a prefabricated pier connection construction method with grouting first, specifically: first, grouting material is poured into the grouting sleeve of the prefabricated pier, the grouting hole is blocked, and the grouting material in the grouting sleeve is sealed by a grouting pad. At the same time, the combined trough plate is placed on the pedestal, and grouting material is poured into the trough. Then the grouting sleeve of the prefabricated pier is connected to the protruding steel bars of the pedestal, and the excess grouting material is squeezed out from the grouting holes of the grouting sleeve. The grouting material in the combined trough plate can fill the joints between the piers, further preventing the grouting material in the grouting sleeve from flowing out. The grouting sleeve of the present invention adopts the method of grouting first and then inserting steel bars, which has the characteristics of good grouting fluidity, dense grouting, and no leakage, solves the problem of incomplete grouting of the sleeve, and the construction process is simple and easy.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge prefabrication and assembly, and in particular relates to a prefabricated bridge pier connection construction method with grouting first. Background Art

[0002] Prefabricated bridges refer to bridges in which the main components, such as the main beam and piers, are manufactured in factories and assembled mechanically at the construction site. This ensures high construction quality, good safety, a short construction period, less labor, and reduces noise generated during construction. It meets the requirements of environmental friendliness and green construction and has become one of the main development directions of bridge engineering construction.

[0003] Grouting sleeves, as a method of connecting steel bars, are currently the most commonly used method for connecting the substructure of urban bridges. The existing grouting sleeve connection method is to first connect the steel bars and then grout. This method is prone to the problem of loose grouting during construction, resulting in the connection strength not meeting the requirements and affecting the quality of the project. The reasons for loose grouting are: 1) The gap between the steel rib and the sleeve is narrow, and the grouting material has poor fluidity in the gap, forming bubbles, resulting in incomplete grouting. This situation is more serious for eccentric steel bars; 2) Due to the gap between the pier and the abutment, the grouting material flows out from the bottom of the sleeve into the joint after grouting, forming a cavity in the sleeve, which greatly reduces the connection strength.

[0004] Therefore, economical and effective construction measures to improve the grouting quality of grouting sleeves need to be studied. Summary of the Invention

[0005] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a prefabricated bridge pier connection construction method with grouting first. The grouting sleeve adopts the method of grouting first and then inserting steel bars. It has the characteristics of good fluidity, dense grouting and no leakage of grouting, solves the problem of incomplete grouting of the grouting sleeve, and the construction process is simple and easy.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for connecting prefabricated bridge piers with grouting first comprises the following steps: first, grouting is performed in a grouting sleeve built into the prefabricated bridge pier and the grouting sleeve is sealed; then, the grouting sleeve of the prefabricated bridge pier is connected to the corresponding steel bars extending from the abutment; excess grouting material is squeezed out from the grouting holes of the grouting sleeve; and after curing, the connection between the prefabricated bridge pier and the abutment is completed.

[0008] Preferably, a combined trough plate is provided at the joint position between the top of the pedestal and the prefabricated pier and around the protruding steel bars of the pedestal. After the grouting sleeve is grouted and before the grouting sleeve is inserted into the protruding steel bars of the pedestal, grouting material is poured into the combined trough plate to prevent the grouting material in the grouting sleeve from flowing out.

[0009] Further preferably, a rubber pad is provided on the contact surface between the combined trough plate and the cap to prevent the grouting material from flowing away from between the trough plate and the cap concrete.

[0010] To prevent grout from leaking out of the grouting sleeve before reinforcing bars are inserted, a stopper pad is preferably installed at the bottom of the sleeve. The pad is a circular rubber sheet with the same diameter as the sleeve and is bonded to the sleeve's outer wall. The pad is provided with slits radiating from the center of the circle for insertion of the rebar extending from the cap.

[0011] Preferably, after the prefabricated piers and the abutment are manufactured, the grouting sleeves of the prefabricated piers and the protruding steel bars of the abutment are trial-jointed without grouting to check the feasibility of the joint.

[0012] Preferably, the combined trough plate is formed by connecting trough plates end to end, the inner wall length of the trough plate is greater than the side length of the prefabricated pier, and the combined trough plate is a frame structure whose shape matches the cross-section of the prefabricated pier.

[0013] Further preferably, when the cross section of the prefabricated bridge pier is square, the combined trough plate is a square structure formed by connecting four trough plates end to end, with adjacent trough plates being perpendicular to each other. Specifically:

[0014] Each slot plate consists of two rectangular steel plates of the same width and two square magnetic plates. The short side of one rectangular steel plate is spliced ​​with a square magnetic plate to form a large long plate. After splicing, the length of the long plate is the same as that of the other rectangular steel plate, and the two are vertically connected in pairs through another square magnetic plate.

[0015] Further preferably, when the cross-section of the prefabricated pier is a rectangular cross-section, the combined trough plate is a rectangular structure formed by connecting four trough plates end to end, adjacent trough plates are perpendicular to each other, and the length of the trough plate is determined according to the side length of the rectangular cross-section of the prefabricated pier.

[0016] Further preferably, for a prefabricated bridge pier with a circular cross-section, the channel plate is designed as arc segments of corresponding length according to the circular cross-section of the prefabricated bridge pier.

[0017] Preferably, the connection construction method comprises the following steps:

[0018] The first step is to make prefabricated bridge piers. The prefabricated bridge piers are reinforced concrete structures with built-in grouting sleeves at the bottom of the prefabricated bridge piers and prefabricated pier protruding steel bars at the top of the prefabricated bridge piers.

[0019] The second step is to make the cap. The cap is a reinforced concrete structure with extended steel bars on the cap surface corresponding to the grouting sleeves of the prefabricated piers.

[0020] The third step is to test-join the prefabricated piers and the abutment. This involves butting the grouting sleeves of the prefabricated piers against the abutment's extended reinforcement without grouting. This is done to verify the feasibility of the joint and avoid situations where the joint cannot be joined after grouting or the waiting time is too long. After the joint is completed, the prefabricated piers are hoisted.

[0021] The fourth step is to install a composite channel plate at the joint between the top of the abutment and the prefabricated pier. Before the grouting sleeve is connected to the protruding steel bars of the abutment, pour grouting material into the composite channel plate to complete the grouting material laying on the joint between the prefabricated pier and the abutment, which can prevent the grouting material in the grouting sleeve from flowing out.

[0022] Step 5: inject grouting material into the grouting hole of the grouting sleeve, and seal the grouting hole and the grouting hole after the grouting material is discharged from the grouting hole;

[0023] The sixth step is to connect the grouting sleeve of the prefabricated pier with the protruding steel bars of the pedestal. After inserting the protruding steel bars of the pedestal, the rubber sheet of the grouting pad is deformed and fits tightly with the protruding steel bars of the pedestal to ensure that there is no leakage. At the same time, the grouting holes are opened, and the grouting material in the grouting sleeve is squeezed by the protruding steel bars of the pedestal and discharged from the grouting holes. After the prefabricated pier is in place, the grouting holes are sealed again. The connection between the prefabricated pier and the pedestal is completed through maintenance.

[0024] Further preferably, before grouting the grouting sleeve, a grouting pad is provided at the bottom of the grouting sleeve to ensure that the grouting material does not flow out before the protruding steel bars of the base are inserted; the grouting sleeve may not be provided with grouting holes, and grouting is performed by the grouting head through the steel bar insertion hole on the grouting pad. The steel bar insertion hole is formed by cutting cracks radially distributed along the center of the circle. After grouting, the grouting head pulls out the grouting pad to ensure that the grouting material in the grouting sleeve does not flow out.

[0025] The beneficial effects of the present invention are:

[0026] (1) The present invention realizes the free flow of grouting material in the sleeve cavity by grouting first, which has a large flow space and good filling capacity. The steel bars are inserted into the full grouting sleeve cavity by inserting the steel bars later, which well ensures the fullness of the grouting in the sleeve.

[0027] (2) The present invention provides a rubber sheet grouting pad with a certain rigidity at the bottom of the grouting sleeve, which has fine slits radially distributed along the center of the circle, and is used to replace the grouting pad of the prior art (a rubber ring with a circular hole). Before the steel bar is inserted, the grouting pad can ensure that the grouting material does not flow out. After the steel bar is inserted, the rubber sheet of the grouting pad is deformed and tightly adheres to the steel bar to ensure that there is no leakage.

[0028] (3) Since the grouting sleeve of the present invention is grouted first and then the steel bars are inserted, when the grouting sleeve of the prefabricated pier is connected to the steel bars extending from the pedestal, the excess grouting material will be squeezed out from the grouting hole of the grouting sleeve. Therefore, the present invention sets a combined trough plate and grouting material in the combined trough plate to surround the grouting material, replacing the work of the existing support formwork and fully filling the joint between the pier and the pedestal, which can prevent the grouting material in the grouting sleeve from flowing out into the joint, thereby ensuring the dense grouting, avoiding the generation of bubbles, and ensuring the fullness of the grouting material at the joint of the grouting sleeve.

[0029] (4) The construction method of the present invention has the characteristics of good fluidity, dense grouting, and no leakage, which solves the problems of the grouting sleeve being not dense and full, and having bubbles, and brings great convenience to the construction of prefabricated bridge piers. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the prefabricated bridge pier and the cap after grouting in advance according to the present invention;

[0031] Figure 2 This is a schematic structural diagram of the prefabricated bridge pier of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the slot plate of the present invention;

[0033] Figure 4 This is a schematic diagram of the installation and joint grouting of the combined trough plate of the present invention;

[0034] Figure 5 This is a schematic diagram of grouting sleeves in prefabricated bridge piers according to the present invention;

[0035] Figure 6 This is a schematic diagram of the grouting pad when the grouting sleeve of the present invention is not inserted into the steel bar;

[0036] Figure 7 This is a schematic diagram of the connection between the grouting sleeve inside the prefabricated pier and the outer reinforcement of the cap;

[0037] Figure 8 This is a schematic diagram of the grouting sleeve of the present invention butting up against the grouting pad after the outer reinforcement of the cap;

[0038] Figure 9 This is a schematic diagram of a circular-shaped combined slot plate according to the present invention;

[0039] Figure 10 This is a flow chart of the connection construction of prefabricated bridge piers according to the present invention.

[0040] In the figure: In the figure, 1. Prefabricated bridge pier, 2. Cap, 3. Grouting sleeve, 4. Cap extending steel bar, 5. Prefabricated bridge pier extending steel bar, 6. Combined trough plate, 7. trough plate, 8. Steel plate, 9. Magnetic plate, 10. Grouting pad, 11. Grouting hole, 12. Grouting hole, 13. Rubber plug. DETAILED DESCRIPTION

[0041] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0042] The present invention's construction method for connecting a prefabricated bridge pier to a cap is as follows: first, grouting material is poured into the grouting sleeve of the prefabricated bridge pier, the grouting holes and grouting holes on the grouting sleeve are sealed, and the grouting material in the grouting sleeve is sealed with a grouting pad bonded to the bottom of the grouting sleeve. Simultaneously, a composite trough plate is placed on the cap, and grouting material is poured into the trough formed by the composite trough plate. Then, the grouting sleeve of the prefabricated bridge pier is connected to the protruding steel bars of the cap, and excess grouting material is squeezed out of the grouting sleeve's grouting holes. The grouting material in the composite trough plate prevents the grouting material in the grouting sleeve from flowing out.

[0043] Preferably, a combined trough plate is provided at the joint position between the top of the pedestal and the prefabricated pier and around the protruding steel bars of the pedestal. After the grouting sleeve is grouted and before the grouting sleeve is inserted into the protruding steel bars of the pedestal, grouting material is poured into the combined trough plate to prevent the grouting material in the grouting sleeve from flowing out.

[0044] To prevent grout from leaking out of the grouting sleeve before reinforcing bars are inserted, a stopper pad is preferably installed at the bottom of the sleeve. The pad is a circular rubber sheet with the same diameter as the sleeve and is bonded to the sleeve's outer wall. The pad is provided with slits radiating from the center of the circle for insertion of the rebar extending from the cap.

[0045] Preferably, after the prefabricated piers and the abutment are manufactured, the grouting sleeves of the prefabricated piers and the protruding steel bars of the abutment are trial-jointed without grouting to check the feasibility of the joint.

[0046] Preferably, the combined trough plate is formed by connecting trough plates end to end, the inner wall length of the trough plate is greater than the side length of the prefabricated pier, and the combined trough plate is a frame structure whose shape matches the cross-section of the prefabricated pier, and is used for grouting material in the trough surrounded by the combined trough plate to prevent the grouting material in the grouting sleeve from flowing out when the steel bar is inserted.

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0048] Example 1

[0049] This embodiment is described by taking the case where the cross section of the prefabricated bridge pier 1 is square as an example. The structure after the prefabricated bridge pier 1 and the cap 2 are connected after grouting is performed is shown in the attached figure. Figure 1 , construction process refer to the attached Figure 10 , the specific connection construction method includes the following steps:

[0050] (1) Making prefabricated bridge pier 1: The prefabricated bridge pier 1 is a reinforced concrete structure, with a built-in grouting sleeve 3 at the bottom of the prefabricated bridge pier 1 and a prefabricated bridge pier protruding steel bar 5 at the top of the prefabricated bridge pier 1; the structural diagram of the prefabricated bridge pier 1 is as follows: Figure 2 shown.

[0051] The grouting sleeve 3 has grouting holes 11 and grouting holes 12. It can be a half grouting sleeve 3 or a full grouting sleeve 3. This embodiment is described by taking the half grouting sleeve 3 as an example. Figure 5 Schematic diagram of the structure.

[0052] One end of the semi-grouting sleeve 3 is connected to the steel bars inside the prefabricated pier 1, and the other end is used to be connected to the steel bars 4 extending from the abutment during the later construction process.

[0053] A grouting pad 10 is installed at the bottom of the grouting sleeve 3. This is a circular rubber sheet with the same diameter as the sleeve 3 and is bonded to the outer wall of the sleeve 3. Evenly spaced radial slits are cut from the center of the pad 10 to facilitate the insertion of rebar. The pad 10 is 5 mm thick and has a certain degree of rigidity, preventing grout from leaking out of the sleeve 3 before rebar is inserted.

[0054] (2) Making the pedestal 2: The pedestal 2 is a reinforced concrete structure, and the surface of the pedestal 2 has pedestal protruding steel bars 4 corresponding to the positions of the grouting sleeves 3 of the prefabricated pier 1.

[0055] (3) The prefabricated pier 1 and the abutment 2 are spliced ​​together for trial, that is, the grouting sleeve 3 of the prefabricated pier 1 and the protruding steel bar 4 of the abutment are connected without grouting to check the feasibility of the connection and avoid the situation where the connection cannot be made after grouting or the waiting time is too long. After the connection is completed, the prefabricated pier 1 is hoisted.

[0056] (4) Install the combined channel plate 6 at the joint position between the top of the pedestal 2 and the prefabricated pier 1 and around the protruding steel bars 4 of the pedestal, such as Figure 4 At the same time, a rubber pad can be provided on the contact surface between the combined trough plate 6 and the cap 2 to prevent the grouting material from flowing away between the combined trough plate 6 and the cap 2 concrete.

[0057] The shape of the combined slot plate 6 matches the square cross-section of the prefabricated bridge pier 1. It is a square structure formed by four slot plates 7 connected end to end, and adjacent slot plates 7 are perpendicular to each other. Each slot plate 7 is welded by a steel plate 8 and a magnetic plate 9 (the magnetic plate 9 is a steel plate with magnetic material). The inner wall length of the slot plate 7 is required to be greater than the side length of the prefabricated bridge pier 1. Specifically, each slot plate 7 includes two rectangular steel plates 8 and two square magnetic plates 9 of the same width, where the short side of a rectangular steel plate is spliced ​​with a square magnetic plate 9 to form a large long plate (side plate). After splicing, the length of the long plate is the same as the length of the other rectangular steel plate (bottom plate). The two are vertically connected in pairs through another square magnetic plate 9. The structure of the slot plate 7 is as shown in the figure. Figure 3 As shown, a square structure is formed by connecting the magnetic plates 9 of four slot plates 7 to each other, so as to be suitable for bridge piers with square cross-sections.

[0058] For example, in each channel plate 7, the magnetic plate 9 is 10 cm long, 10 cm wide, and 1 cm thick. The steel plate 8 (bottom plate) is 1 cm thick and 10 cm wide, 10 cm longer than the side length of the pier. The inner wall of the channel plate 7 is 5 cm longer at each end than the side length of the precast pier 1, creating a 5 cm wide gap between the channel plate and the precast pier 1.

[0059] (5) Inject grouting material into the grouting hole 11 of the grouting sleeve 3, and seal the grouting hole 11 and the grouting hole 12 with a rubber plug 13 after the grouting material is discharged from the grouting hole 12. The schematic diagram of grouting the grouting sleeve 3 in the prefabricated bridge pier 1 is shown in FIG. Figure 5 As shown, the grouting pad 10 bonded to the bottom of the grouting sleeve 3 is used to prevent the grouting material in the grouting sleeve 3 from flowing out. At this time, the grouting sleeve 3 is not inserted into the steel bar. The schematic diagram of the grouting pad 10 is as shown in FIG. Figure 6 shown.

[0060] (6) Pour 2cm thick grouting material into the combined trough plate 6 to complete the laying of grouting material on the joint between the cap 2 and the prefabricated pier 1. Figure 4 As shown; the grouting sleeve 3 of the prefabricated pier 1 is connected to the outer steel bar 4 of the cap, and the schematic diagram of the grouting sleeve 3 inside the prefabricated pier 1 and the outer steel bar of the cap 2 is shown as Figure 7 As shown, the shape of the slurry stop pad 10 is as follows: Figure 8 As shown; when docking, the plug 13 of the grouting hole 12 should be opened, and the grouting material in the grouting sleeve 3 is squeezed by the steel bar and discharged from the grouting hole 12. After the prefabricated pier 1 is in place, the grouting hole 12 is sealed again, and the connection between the prefabricated pier 1 and the abutment 2 is completed through maintenance.

[0061] Example 2

[0062] In this embodiment, the cross section of the bridge pier is a rectangular cross section, and the length of the corresponding trough plate 7 is determined according to the side length of the rectangular structure. The corresponding design structure of the combined trough plate 6 is:

[0063] The rectangular pier has a cross-section of 100 cm x 200 cm. Within each channel plate 7, the magnetic plate 9 is 10 cm long, 10 cm wide, and 1 cm thick. The steel plate 8 (bottom plate) is 1 cm thick and 10 cm wide, and comes in two lengths: 110 cm and 210 cm. The inner wall of the channel plate 7 is 5 cm longer at each end than the side length of the prefabricated pier 1.

[0064] In this embodiment, no grouting hole 11 is provided on the grouting sleeve 3. Grouting is performed by using a grouting head to pass through the steel bar insertion hole on the grouting pad 10. The steel bar insertion hole is formed by cutting cracks radially distributed along the center of the circle. After grouting, the grouting head pulls out the grouting pad 10 to ensure that the grouting material in the grouting sleeve 3 does not flow out.

[0065] Other construction steps are the same as those in Example 1.

[0066] Example 3

[0067] In this embodiment, a cylindrical prefabricated bridge pier 1 is used, that is, the cross section of the prefabricated bridge pier 1 is a circular cross section, and the length of the channel plate 7 is designed to be an arc segment according to the circular cross section. The arc segments are spliced ​​together to form a structure corresponding to the circular cross section of the prefabricated bridge pier 1. Figure 9 As shown:

[0068] When the diameter of the prefabricated pier 1 is 100 cm, the combined trough plate 6 is composed of two arc-shaped segment trough plates 7. The trough plate 7 of each arc-shaped segment is composed of an arc-shaped steel plate 8 and two square magnetic plates 9 (end plates). The size of the square magnetic plate 9 is 10 cm × 10 cm × 1 cm. The arc-shaped steel plate 8 is divided into a bottom plate and a side plate perpendicular to the bottom plate, and the bending radius is 55 cm.

[0069] Other construction steps are the same as those in Example 1.

[0070] The above embodiments are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all implementation methods here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A prefabricated pier connection construction method with grouting first, characterized in that The method comprises the following steps: first, grouting the built-in grouting sleeve of the prefabricated bridge pier and sealing the grouting hole; then, connecting the grouting sleeve of the prefabricated bridge pier with the corresponding outer reinforcement of the abutment; squeezing out the excess grouting material from the grouting sleeve's discharge hole; and completing the connection between the prefabricated bridge pier and the abutment after curing; A grouting pad is provided at the bottom of the grouting sleeve. The grouting pad is a circular rubber sheet with the same diameter as the grouting sleeve. The grouting pad is provided with cutting gaps radiating from the center of the circle to the surrounding areas. Before the protruding steel bars of the pedestal are inserted, the grouting pad prevents the grouting material from flowing out. After the protruding steel bars of the pedestal are inserted, the rubber sheet of the grouting pad is deformed and fits tightly against the protruding steel bars of the pedestal to ensure that there is no leakage.

2. The construction method according to claim 1, characterized in that: A composite trough plate is provided around the protruding steel bars of the pedestal. The composite trough plate is located at the joint position between the top of the pedestal and the prefabricated pier. After the grouting sleeve is grouted and before the grouting sleeve is inserted into the protruding steel bars of the pedestal, grouting material is poured into the composite trough plate to fill the joint between the prefabricated pier and the pedestal, further preventing the grouting material in the grouting sleeve from flowing out.

3. The construction method according to claim 1, wherein: After completing the production of prefabricated bridge piers and abutments, the grouting sleeves of the prefabricated bridge piers and the protruding steel bars of the abutments are trial-jointed without grouting to test the feasibility of the joint.

4. The construction method according to claim 2, characterized in that: The combined trough plate is a frame structure formed by vertically splicing trough plates from head to tail. The inner wall length of the trough plate is greater than the side length of the prefabricated pier, and the shape of the combined trough plate matches the cross-sectional shape of the prefabricated pier.

5. The construction method according to claim 2, characterized in that: A rubber pad is provided on the contact surface between the combined trough plate and the cap to prevent the grouting material from flowing away from between the trough plate and the cap concrete.

6. The construction method according to claim 1, characterized in that The steps include: The first step is to create a prefabricated bridge pier. The bottom of the prefabricated pier is built with a grouting sleeve and the top has a prefabricated pier extension steel bar. A grouting pad is installed at the bottom of the grouting sleeve. The grouting pad is a circular rubber sheet with the same diameter as the grouting sleeve. The grouting pad is provided with slits radiating from the center of the circle to prevent grouting from flowing out of the grouting sleeve before the extension steel bar of the abutment is inserted. The second step is to make the cap, with the cap's surface having the cap's extended steel bars corresponding to the position of the grouting sleeves of the prefabricated piers; The third step is to test-join the prefabricated piers and the abutment. This involves butting the grouting sleeves of the prefabricated piers against the abutment's extended reinforcement without grouting to verify the feasibility of the joint. Once the joint is complete, the prefabricated piers are hoisted. The fourth step is to install a composite trough plate at the joint between the top of the abutment and the prefabricated pier. The composite trough plate is a frame structure surrounded by trough plates. Before the grouting sleeve is connected to the outer reinforcement of the abutment, grouting material is poured into the composite trough plate to complete the grouting material laying on the joint between the prefabricated pier and the abutment, and prevent the grouting material in the grouting sleeve from flowing out. Step 5: inject grouting material into the grouting hole of the grouting sleeve, and seal the grouting hole and the grouting hole after the grouting material is discharged from the grouting hole; The sixth step is to connect the grouting sleeve of the prefabricated pier with the protruding steel bars of the pedestal. After inserting the protruding steel bars of the pedestal, the rubber sheet of the grouting pad is deformed and fits tightly with the protruding steel bars of the pedestal to ensure that there is no leakage. At the same time, the grouting holes are opened, and the grouting material in the grouting sleeve is squeezed by the protruding steel bars of the pedestal and discharged from the grouting holes. After the prefabricated pier is in place, the grouting holes are sealed again. The connection between the prefabricated pier and the pedestal is completed through maintenance.

7. The construction method according to claim 6, characterized in that: There is no grouting hole on the grouting sleeve. Grouting is done by passing the grouting head through the grouting pad. After grouting, the grouting head pulls out the grouting pad to ensure that the grouting material in the grouting sleeve does not flow out.

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