Bridge full-precast substructure and construction method thereof

Abstract

This invention relates to the field of bridge prefabrication and assembly technology, and discloses a fully prefabricated substructure for bridges, including prefabricated piles and a composite pier cap. The composite pier cap includes a prefabricated pier cap body and prefabricated pile caps. The prefabricated pier cap body has a prefabricated pile cap groove for inserting the prefabricated pile cap. Grouting material is injected into the gap between the prefabricated pile cap groove and the prefabricated pile cap. The bottom of the prefabricated pile cap has a slot. The bottom plate of the prefabricated pier cap body has a prefabricated pile hole for driving the prefabricated pile into the slot. Grouting material is injected into the gap between the prefabricated pile hole and the prefabricated pile. This invention uses prestressed tendons to install prefabricated piers. One end of the prestressed tendon is anchored to the bottom of the prefabricated pier cap body, and the other end is anchored to the top of the pier. The gap between the prefabricated pile cap and the prefabricated pier cap covers the prefabricated pile driving deviation, solving the problem of difficult installation of prefabricated pier caps due to poor prefabricated pile driving accuracy, thereby achieving reliable and rapid connection of the fully prefabricated substructure.

Description

Technical Field

[0001] This invention relates to the field of bridge prefabrication and assembly technology, specifically to a fully prefabricated substructure for bridges and its construction method. Background Technology

[0002] Prefabricated bridge piers are a major direction in national infrastructure construction, characterized by high construction quality, short construction time, minimal traffic disruption, and environmental friendliness, aligning with the national dual-carbon policy. However, the application of prefabricated pier caps for bridge substructures is currently limited; most existing pier caps are cast-in-place structures, resulting in long construction times of nearly 28 days, which can easily impact the project schedule.

[0003] Prefabrication is often chosen in existing projects to shorten the construction period, but the assembly method of prefabricated pile foundations and prefabricated platforms is used, that is, prefabricated pile foundations are driven into the prefabricated platforms, which makes it difficult to achieve accurate connection.

[0004] Therefore, a new bridge prefabrication and installation structure and connection method are needed to solve the problem of difficulty in installing prefabricated abutments due to poor driving accuracy of prefabricated piles. Summary of the Invention

[0005] The purpose of this invention is to provide a fully prefabricated substructure for bridges and its construction method, so as to solve the problem in the background art that the prefabricated abutment is difficult to install due to the poor driving accuracy of prefabricated piles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A fully prefabricated substructure for a bridge includes prefabricated piles and a composite pile cap. The composite pile cap includes a prefabricated pile cap body and prefabricated pile caps. The prefabricated pile cap body has a prefabricated pile cap groove for inserting the prefabricated pile cap. Grouting material is injected into the gap between the prefabricated pile cap groove and the prefabricated pile cap. The bottom of the prefabricated pile cap has a slot. The bottom plate of the prefabricated pile cap body has a prefabricated pile opening for driving the prefabricated pile into the slot. Grouting material is injected into the gap between the prefabricated pile opening and the prefabricated pile.

[0008] Preferably, in the prefabricated substructure of the bridge, the frame beam of the prefabricated pier body is provided with a first prestressing duct, and a prestressing tendon is preset in the first prestressing duct. One end of the prestressing tendon is anchored to the bottom plate of the prefabricated pier body, and the other end of the prestressing tendon is anchored to the top of the pier. After the prestressing tendon is tensioned, the connection between the pier and the prefabricated pier body is realized.

[0009] Preferably, in the fully prefabricated substructure of the bridge, the first prestressed duct is located in the middle of the adjacent prefabricated pile cap groove.

[0010] Preferably, in the fully prefabricated substructure of the bridge, the sidewalls of the prefabricated piles located at the elevation position of the bottom of the prefabricated pier body are fitted with shear brackets in the form of clamps, which facilitates the temporary fixation of the prefabricated pier body.

[0011] Preferably, in the fully prefabricated substructure of the bridge, the diameter of the prefabricated pile opening is at least 20cm longer than the diameter of the prefabricated pile.

[0012] Preferably, in the fully prefabricated substructure of the bridge, the diameter of the pile cap groove is at least 20 cm longer than the diameter of the pile cap.

[0013] Preferably, in the fully prefabricated substructure of the bridge, the diameter of the slot is at least 2 cm larger than the diameter of the prefabricated pile, the height of the slot is at least 0.7 times the diameter of the prefabricated pile, and the height of the prefabricated pile cap is twice the height of the slot.

[0014] A bridge construction method for a fully prefabricated substructure includes prefabricated piles and a composite pile cap. The composite pile cap includes a prefabricated pile cap body and prefabricated pile caps. The prefabricated pile cap body has a prefabricated pile cap groove for inserting the prefabricated pile cap. Grouting material is injected into the gap between the prefabricated pile cap groove and the prefabricated pile cap. The bottom of the prefabricated pile cap has a slot. The bottom plate of the prefabricated pile cap body has a prefabricated pile opening for driving the prefabricated pile into the slot. Grouting material is injected into the gap between the prefabricated pile opening and the prefabricated pile.

[0015] The frame beam of the precast pier body is provided with a first prestressing duct, and a prestressing tendon is preset in the first prestressing duct. One end of the prestressing tendon is anchored to the bottom plate of the precast pier body, and the other end of the prestressing tendon is anchored to the top of the pier. After the prestressing tendon is tensioned, the connection between the pier and the precast pier body is realized.

[0016] The specific construction method includes the following steps:

[0017] The first step is to drive the precast piles into the ground; specifically, when driving them into the ground, the ground is excavated, and the excavation dimensions are the dimensions of the pile cap plane.

[0018] The second step is to pass one end of the prestressed tendon through the first prestressed duct and anchor it to the bottom plate of the precast pier body. The precast pier body is then inserted into the precast pile through the precast pile opening, and grout is injected into the gap between the precast pile opening and the precast pile.

[0019] The third step is to install the precast pile cap onto the precast pile through the slot, and to fill the gap between the precast pile cap and the precast pile cap slot with grout to achieve the connection between the precast pile cap and the precast pile cap body; wherein, the elevation position of the precast pile is fixed by the soil layer height or shear bracket.

[0020] The fourth step is to pass the other end of the prestressing tendon through the second prestressing duct on the precast pier, and anchor the other end of the prestressing tendon to the top of the precast pier, and then install the precast pier.

[0021] The fifth step is to tension the prestressed tendons to complete the connection.

[0022] In the bridge construction method for the fully prefabricated substructure, preferably, in the second step, the prefabricated abutment is placed on the shear corbel of the prefabricated pile sidewall, and the elevation position of the abutment is adjusted by the elevation of the shear corbel.

[0023] In the bridge construction method for the fully prefabricated substructure, preferably, in the second step, the prefabricated abutment is placed on the ground, and the elevation of the abutment is adjusted by the elevation of the ground.

[0024] Beneficial effects

[0025] The present invention has the following advantages due to the adoption of the above technical solutions:

[0026] 1. The gap between the precast pile cap and the precast pile cap body covers the precast pile driving deviation, which solves the problem that the precast pile cap is not easy to install due to the poor driving accuracy of the precast pile, and thus realizes the reliable and rapid connection of the fully precast assembly substructure;

[0027] 2. By using precast piles, precast pile caps, precast pile caps, prestressed tendons, and precast bridge piers in combination, the construction period has now been shortened from an average of 28 days to 3 days.

[0028] 3. This invention features simple operation and rapid construction, making it suitable for the widespread application of prefabricated bridges on land or in water. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the fully prefabricated substructure of the bridge according to the present invention;

[0030] Figure 2 This is a plan view of the fully prefabricated substructure of the bridge according to the present invention;

[0031] Figure 3 This is an elevation view of the prefabricated substructure of the bridge according to the present invention.

[0032] Figure 4 This is a flowchart illustrating the construction process of the fully prefabricated substructure connection in this application.

[0033] Labels for each item in the figure:

[0034] 1. Precast pile cap body; 2. Precast pile cap; 3. Precast pile cap groove; 4. Grooving;

[0035] 5. Precast piles; 6. First prestressed duct; 7. Prestressed tendons; 8. Shear brackets;

[0036] 9. Precast bridge piers; 10. Grouting material; 11. Precast pile hole opening. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] In the description of this invention, it should be noted that the terms "upper", "top", "bottom", "both sides", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "set up" and "equipped with" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] The fully prefabricated substructure of the bridge disclosed in the embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] See Figure 1 , Figure 2 and Figure 3A fully prefabricated substructure for a bridge includes prefabricated piles and a composite abutment. The composite abutment includes a prefabricated abutment body 1 and prefabricated pile caps 2. The prefabricated abutment body 1 is provided with a prefabricated pile cap groove 3 for inserting the prefabricated pile cap 2. Grouting material 10 is injected into the gap between the prefabricated pile cap groove 3 and the prefabricated pile cap 2. The bottom of the prefabricated pile cap 2 is provided with a slot 4. The bottom plate of the prefabricated abutment body 1 is provided with a prefabricated pile opening 11 for driving prefabricated piles 5 into the slot 4. Grouting material 10 is injected into the gap between the prefabricated pile opening 11 and the prefabricated pile 5.

[0042] Precast piles 5, precast pile caps 1, precast pile caps 2 and precast bridge piers 9 are manufactured in the factory and transported to the construction site.

[0043] The precast pile 5 has a diameter of 0.6m and can be either a solid pile or a hollow pipe column. The length of the precast pile 5 is determined by the geological conditions. The precast pile 5 is driven into the soil using piling equipment. The spacing between two adjacent precast piles 5 is 2m. After installation, the piles are cut according to the design elevation.

[0044] The diameter of the slot 4 is at least 2 cm larger than the diameter of the precast pile 5, the height of the slot 4 is at least 0.7 times the diameter of the precast pile 5, and the height of the precast pile cap 2 is twice the height of the slot 4. The height of the slot 4 is related to the depth to which the precast pile 5 is inserted into the precast pile cap 2; that is, the deeper the precast pile 5 is inserted into the precast pile cap 2, the stronger it will be after insertion.

[0045] The purpose of the relationship between the height of the precast pile cap 2 and the slot 4 is to limit the thickness of each wall of the precast pile cap 2 after the slot 4 is removed, so that it is not too thin.

[0046] Preferably, the slot 4 is cylindrical.

[0047] The bottom plate of the precast pier body 1 is provided with a first prestressing duct 6, and a prestressing tendon 7 is preset in the first prestressing duct 6. One end of the prestressing tendon 7 is anchored to the bottom plate of the precast pier body 1, and the other end of the prestressing tendon 7 is anchored to the top of the precast pier 9. After the prestressing tendon 7 is tensioned, the connection between the precast pier 9 and the precast pier body 1 is realized.

[0048] See Figure 4 The specific construction method includes the following steps:

[0049] The first step is to drive the precast piles 5 into the ground; specifically, when driving them into the ground, the ground is excavated, and the excavation dimensions are the same as the dimensions of the pile cap plane.

[0050] The second step is to pass one end of the prestressed tendon 7 through the first prestressed duct 6 and anchor it to the bottom plate of the precast pile body 1. The precast pile body 1 is then inserted into the precast pile 5 through the precast pile opening 11, and grout is injected into the gap between the precast pile opening 11 and the precast pile 5.

[0051] The third step is to install the precast pile cap 2 onto the precast pile 5 through the slot 4, and fill the gap between the precast pile cap 2 and the precast pile cap slot 3 with grout to achieve the connection between the precast pile cap 2 and the precast pile cap body 1; wherein, the elevation position of the precast pile 5 is fixed by the soil layer height or shear bracket.

[0052] The fourth step is to pass the other end of the prestressing tendon 7 through the second prestressing duct on the precast pier 9, and anchor the other end of the prestressing tendon 7 to the top of the precast pier 9, and then install the precast pier 9.

[0053] Step 5: Tension the prestressed tendon 7 to complete the connection.

[0054] Among them, the diameter of the precast pile opening 11 is 0.8m, and the thickness of the bottom plate of the precast pile cap body 1 is 0.6m;

[0055] The precast pile cap 2 is a cube with a side length of 1.2m. The bottom of the precast pile cap 2 has a slot 4 with a diameter of 1.22m and a depth of 0.6m.

[0056] The precast pile cap groove 3 has a depth of 1.2m and a side length of 1.4m. The gap between the precast pile cap groove 3 and the precast pile cap 2 is filled with grout 10.

[0057] Grouting material 10 can be high-strength concrete or high-performance concrete material;

[0058] The precast pier 9 is a hollow structure, meaning that the cross-section of the precast pier 9 can be annular. A second prestressed duct is set from top to bottom in the annular wall, and the diameter and position of the duct correspond to the position of the first prestressed duct 6 of the precast pier body 1.

[0059] The precast pile cap 2 can be a cylindrical or cubic structure, and the corresponding precast pile cap groove 3 is also circular or square.

[0060] In another optional embodiment of the present invention, the precast piles 5 can be driven into the underwater soil layer by a piling vessel. Before installing the precast foundation body 1, shear brackets are installed on the side walls of the precast piles 5 at the bottom elevation position of the precast foundation body 1 using a clamp-type method to facilitate temporary fixation of the precast foundation body 1. Figure 3 As shown, the prestressed tendons 7 can provide upward support for the precast pier body 1.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bridge construction method of a bridge full-precast substructure, characterized by, The system includes precast piles and a composite pile cap. The composite pile cap includes a precast pile cap body and a precast pile cap. The precast pile cap body is provided with a precast pile cap groove for inserting the precast pile cap. Grouting material is injected into the gap between the precast pile cap groove and the precast pile cap. The bottom of the precast pile cap is provided with a slot. The bottom plate of the precast pile cap body is provided with a precast pile opening for driving the precast pile into the slot. Grouting material is injected into the gap between the precast pile opening and the precast pile. The frame beam of the precast pier body is provided with a first prestressing duct, and a prestressing tendon is preset in the first prestressing duct. One end of the prestressing tendon is anchored to the bottom plate of the precast pier body, and the other end of the prestressing tendon is anchored to the top of the precast pier. After the prestressing tendon is tensioned, the connection between the pier and the precast pier body is realized. The specific construction method includes the following steps: The first step is to drive the precast piles into the ground; specifically, when driving them into the ground, the ground is excavated, and the excavation dimensions are the dimensions of the pile cap plane. The second step is to pass one end of the prestressed tendon through the first prestressed duct and anchor it to the bottom plate of the precast pier body. The precast pier body is then inserted into the precast pile through the precast pile opening, and grout is injected into the gap between the precast pile opening and the precast pile. The third step is to install the precast pile cap onto the precast pile through the slot, and to fill the gap between the precast pile cap and the precast pile cap slot with grout to achieve the connection between the precast pile cap and the precast pile cap body; wherein, the elevation position of the precast pile is fixed by the soil layer height or shear bracket. The fourth step is to pass the other end of the prestressing tendon through the second prestressing duct on the precast pier, and anchor the other end of the prestressing tendon to the top of the precast pier, and then install the precast pier. The fifth step is to tension the prestressed tendons to complete the connection.

2. The bridge construction method according to claim 1, characterized in that, In the second step, the precast pile cap is placed on the shear bracket of the side wall of the precast pile, and the elevation of the pile cap is adjusted by the elevation of the shear bracket.

3. The bridge construction method according to claim 1, characterized by, In the second step, the precast foundation is placed on the ground, and the elevation of the foundation is adjusted by the elevation of the ground.

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