A bridge cap construction support device and method adjacent to a foundation pit

Abstract

The present invention discloses a support device and method for the construction of a bridge pedestal near a foundation pit, which utilizes existing foundation pit support piles as support for one side of the pedestal foundation pit, and the steel sheet piles on both sides close to the foundation pit support piles are interlocked and connected to the connecting piece through the first steel sheet pile, and the connecting piece is embedded in the transition piece, and the transition piece has a channel steel piece during the transition. The channel steel piece utilizes the foundation pit support piles as support, and the steel sheet piles on one side parallel to the foundation pit support piles are independently arranged, and steel purlins are arranged on the inner sides of the three-sided steel sheet piles. The foundation pit support piles and steel sheet piles of the present invention jointly serve as support for the excavation of the pedestal foundation pit, and the adjacent side foundation pit support piles can provide greater supporting force, thereby protecting the stability of the pedestal foundation pit slope. The discontinuous steel sheet piles far away from the foundation pit side avoid the damage of the anchor cable on the one hand, and on the other hand reduce costs and improve construction efficiency while meeting the soil support requirements.

Description

Technical Field

[0001] The present invention belongs to the field of bridge pedestal construction support, and in particular relates to a bridge pedestal construction support device and method adjacent to a foundation pit. Background Art

[0002] Bridge pile foundations are a common type of bridge foundation, widely used in soft soils. They transfer loads from structures above the pile top to the deeper bearing strata of the foundation. After the pile foundation is poured, a cap foundation pit must be excavated to the designed elevation for the cap foundation. This excavation is typically done using the open-cut method, with steel sheet piles often installed around the perimeter to support the surrounding soil and ensure safety during the excavation and construction of the cap foundation pit.

[0003] When there is a planned foundation pit project for a bridge pier next to the pile foundation, the adjacent foundation pit project is often started after the pile foundation is completed. If the foundation pit is deep or the soil is weak, reinforcement projects such as anchor cable support are required. However, in actual projects, the foundation pit project and the bridge pier project may belong to two different contractors, and the adjacent foundation pit project precedes the bridge pier project, and reinforcement measures such as anchor cables are set up in the bridge pier project area. In this case, if the conventional four-sided steel sheet pile enclosure method is used, it is inevitable that a large area of ​​anchor cables will be cut and removed, which will destroy the integrity of the soil and be detrimental to the stability of the pier foundation pit slope and the efficiency of construction. In addition, there is no pressure or the soil pressure is relatively small on the adjacent foundation pit side. The existing technology does not involve how to use the existing foundation pit support piles as part of the support device to construct the bridge pier. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge pedestal construction support device and method adjacent to a foundation pit, so as to solve the problem of how to support the bridge pedestal construction while ensuring the integrity of the soil as much as possible when the foundation pit project precedes the bridge pedestal project.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A bridge pedestal construction support device adjacent to a foundation pit comprises a connector, a transition piece and a steel sheet pile, wherein one end of the connector is connected to the steel sheet pile via a connector lock, and the other end of the connector is embedded in the transition piece via a connector bayonet, a channel steel piece is fixed on the rear side of the transition piece, foundation pit support piles are arranged on both sides of the transition piece, both ends of the channel steel piece are in contact with the foundation pit support piles on both sides of the transition piece, adjacent steel sheet piles on one side of the channel steel piece are fixed are interlocked, and adjacent steel sheet piles parallel to one side of the channel steel piece are independently arranged, and steel purlins are provided on the inner sides of the steel sheet piles and foundation pit support piles on each side.

[0007] Furthermore, the transition piece includes a transition piece opening steel plate, a built-in H-shaped steel and a transition piece rear side plate. The transition piece is a hollow structure, an opening is provided on the transition piece opening steel plate, the built-in H-shaped steel is connected to the inner side of the transition piece rear side plate, and a plurality of bolts are provided in the vertical direction on the outer side of the transition piece rear side plate.

[0008] Furthermore, the built-in H-shaped steel is arranged in the connector bayonet, and the distance between the built-in H-shaped steel and the transition piece opening steel plate is the same as the width of the connector bayonet.

[0009] Furthermore, the length of the channel steel member is greater than the spacing between adjacent foundation pit support piles.

[0010] Furthermore, the number of the channel steel members in the vertical direction is the same as the number of the bolts on the transition member.

[0011] Furthermore, the steel sheet piles may be Larsen steel sheet piles.

[0012] Furthermore, diagonal braces are provided at the four corners of the steel purlin.

[0013] Furthermore, rotary drilling piles are provided below the steel purlin.

[0014] Furthermore, the rotary drilling piles are arranged in an array.

[0015] A method for supporting the construction of a bridge cap adjacent to a foundation pit comprises the following steps:

[0016] S1, driving the two transition pieces into the soil from the gaps between the foundation pit support piles to the designed elevation, and then inserting the connector bayonet of the connector into the transition piece;

[0017] S2: Align the locking ends of the first steel sheet piles on both sides with the locking ends of the connectors, and drive them to the designed elevation. Then, start driving the remaining steel sheet piles in sequence, interlocking the adjacent steel sheet piles on the left and right sides. Drive the steel sheet piles parallel to the side of the foundation pit support piles individually to the designed elevation, and fix the channel steel members to the foundation pit support piles through transition pieces.

[0018] S3, using steel sheet piles and foundation pit support piles as the back support, excavate the foundation pit in layers, and gradually set up steel purlins from shallow to deep.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The present invention relates to a bridge pedestal construction support device adjacent to a foundation pit, comprising a connecting piece, a transition piece and a steel sheet pile. One end of the connecting piece is connected to the steel sheet pile through a connecting piece lock, and the other end of the connecting piece is embedded in the transition piece through a connecting piece bayonet. A channel steel piece is fixed to the rear side of the transition piece, and foundation pit support piles are arranged on both sides of the transition piece. By utilizing the existing foundation pit support piles as support, the support function can be achieved with only three sides of steel sheet piles. Among them, the steel sheet piles on one side parallel to the foundation pit support piles are independently arranged and do not interfere with the anchor cable, thereby retaining the integrity of the soil to the greatest extent and greatly improving the construction efficiency without destroying the anchor cable.

[0021] Preferably, the connector is embedded in the transition piece, the transition piece H-shaped steel is located in the connector bayonet, and the distance between the built-in H-shaped steel and the transition piece opening steel plate is the same as the width of the connector bayonet, so that the connector tension acts on the built-in H-shaped steel and the transition piece opening steel plate at the same time, which is equivalent to "two layers of interlocking", dispersing the tension transmitted from the steel sheet pile, reducing the requirements for the stiffness of the steel plate used for the connector bayonet, and improving the structure's ability to resist deformation.

[0022] Preferably, when the foundation pit soil is excavated, the steel sheet piles are bound to move in the excavation direction, which may easily cause the connection parts to separate from the steel sheet piles. The connection part bayonet can move left and right in the transition part, which improves the flexibility of the connection parts and can adapt to the displacement changes of the steel sheet piles. At the same time, the steel purlins on the inside of the steel sheet piles support the steel sheet piles, thereby ensuring the stability of the steel sheet piles.

[0023] Preferably, the steel sheet piles on both sides are connected to the foundation pit support piles through connectors, transition pieces and channel steel pieces. When the soil is excavated, the steel sheet piles transfer the soil load to the foundation pit support piles, which is equivalent to "closing", increasing the stability of the structure and improving the support capacity of the steel sheet piles.

[0024] The present invention relates to a method for supporting the construction of a bridge pedestal near a foundation pit. The method utilizes existing foundation pit support piles as support for one side of the pedestal foundation pit. The steel sheet piles on both sides of the foundation pit support piles are interlocked with each other and connected to the connecting piece through the first steel sheet pile. The connecting piece is embedded in the transition piece. The transition piece has a channel steel piece. The channel steel piece utilizes the foundation pit support piles as support. The steel sheet piles on one side parallel to the foundation pit support piles are independently arranged to avoid destroying the anchor cable structure and thus retain the integrity of the soil. Steel purlins are arranged on the inner sides of the three-sided steel sheet piles and the foundation pit support piles to support the outer steel sheet piles. The foundation pit support piles and steel sheet piles of the present invention are provided The support piles at the adjacent side of the foundation pit can provide greater support force and protect the stability of the foundation pit slope. The discontinuous steel sheet piles far away from the foundation pit can avoid the damage of the anchor cable and reduce the cost and improve the construction efficiency while meeting the soil support requirements. The method of the present invention can solve the construction problem of the adjacent foundation pit bridge pile foundation that passes through the existing anchor cable area without the need for special cutting of the anchor cable, realize the stability of the surrounding soil during the excavation of the foundation pit, retain the anchoring effect of the anchor cable and the integrity of the soil to the greatest extent, greatly reduce the construction difficulty and improve the construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the structure of the bridge cap construction support device near the foundation pit in an embodiment of the present invention.

[0026] Figure 2 This is an assembly diagram of the connecting parts and transition parts in the bridge cap construction support device near the foundation pit in an embodiment of the present invention.

[0027] Figure 3 It is a three-dimensional diagram of the channel steel parts in the bridge cap construction support device near the foundation pit in an embodiment of the present invention.

[0028] Among them, 1. Connector; 1-1. Connector lock; 1-2. Connector bayonet; 2. Transition piece; 2-1. Transition piece opening steel plate; 2-2. Built-in H-shaped steel; 2-3. Transition piece rear side plate; 2-4. Bolt; 3. Channel steel; 3-1. Bolt opening; 4. Steel sheet pile; 5. Foundation pit support pile; 6. Rotary drilling pile; 7. Cap; 8. Anchor cable; 9. Steel purlin; 9-1. Diagonal brace. DETAILED DESCRIPTION

[0029] The present invention is described in further detail below with reference to the accompanying drawings:

[0030] like Figure 1As shown, a bridge pier construction support device near a foundation pit includes a connector 1, a transition piece 2, a channel steel piece 3 and a steel sheet pile 4. The connector 1 includes a connector lock 1-1 and a connector bayonet 1-2. One end of the connector 1 is connected to the lock of the steel sheet pile 4 through the connector lock 1-1, and the other end of the connector 1 is embedded in the transition piece 2 through the connector bayonet 1-2. A channel steel piece 3 is fixed on the rear side of the transition piece 2, and foundation pit support piles 5 are arranged on both sides of the transition piece 2. Both ends of the channel steel piece 3 are in contact with the foundation pit support piles 5 on both sides of the transition piece 2. Adjacent steel sheet piles 4 on one side of the channel steel piece 3 are interlocked, and adjacent steel sheet piles 4 parallel to one side of the channel steel piece 3 are independently arranged. Steel purlins 9 are provided on the inner sides of the steel sheet piles 4 on each side.

[0031] Specifically, the support device includes a steel purlin 9 and steel sheet piles 4 surrounded on three sides of the steel purlin 9. The remaining side of the steel purlin 9 is a row of foundation pit support piles 5. The first steel sheet pile 4 on the side of the two steel sheet piles 4 perpendicular to the row of foundation pit support piles 5 is fixed with a connector lock 1-1 through a lock. The other end of the connector 1 is embedded in the transition piece 2 through a connector bayonet 1-2. The rear side plate of the transition piece 2 is fixed with a channel steel piece 3. The channel steel piece 3 is in contact with the foundation pit support pile 5. The foundation pit support pile 5 is used as a support to connect the adjacent steel sheet piles 4 on both sides of the channel steel piece 3. They are interlocked with each other, and the steel sheet piles 4 on one side parallel to the foundation pit supporting piles 5 are independently arranged with each other. The purpose is to prevent the steel sheet piles 4 from interfering with the anchor cables 8 arranged between the foundation pit supporting piles 5, and to ensure the integrity of the anchor cables 8 as much as possible, thereby ensuring the integrity of the soil. The inner side of the steel sheet piles 4 on this side is supported by steel purlins 9, which fully meet the supporting function for the soil during construction. This device uses the existing foundation pit supporting piles 5 as support members, and only uses three steel sheet piles 4 to complete the support of the bridge pier construction, and ensures the integrity of the soil to the greatest extent.

[0032] like Figure 2 As shown, the transition piece 2 includes a transition piece opening steel plate 2-1, a built-in H-shaped steel 2-2 and a transition piece rear side plate 2-3. The transition piece opening steel plate 2-1 is provided with an opening, which cooperates with the steel plate of the connecting piece 1 to facilitate the embedding of the connecting piece 1. The transition piece 2 is a hollow structure, and the built-in H-shaped steel 2-2 is connected to the inner side of the transition piece rear side plate 2-3. A plurality of bolts 2-4 are installed in the vertical direction on the outer side of the transition piece rear side plate 2-3 for connecting with the channel steel piece 3.

[0033] like Figure 3 As shown, a bolt opening 3 - 1 is opened on the channel steel member 3 , the length of the channel steel member 3 is greater than the distance between two adjacent foundation pit support piles 5 , and the number of the channel steel members 3 in the vertical direction is the same as the number of the bolts 2 - 4 on the transition member 2 .

[0034] The steel purlin 9 is arranged on the inner side of the three-sided steel sheet piles 4 to support the steel sheet piles 4. Diagonal braces 9-1 are provided at the four corners of the steel purlin 9 to improve the strength of the steel purlin 9. Rotary piles 6 are also provided under the steel purlin 9, and the rotary piles 6 are arranged in an array.

[0035] Example

[0036] The specific steps of the method of the present invention include:

[0037] Step 1: Preparation before construction;

[0038] Determine the spatial position of the existing anchor cable 8, as well as the installation positions of the bridge pile foundation, pedestal and three-sided steel sheet piles, and control the steel sheet piles on both sides to be located between the gaps between the foundation pit support piles in the length direction, and stagger the anchor cables.

[0039] Step 2: Construction of bridge rotary drilling piles;

[0040] According to the location of the bridge pile foundation, prepare the mud and bury the casing; clean the hole when it reaches the preset depth; then lower the steel cage and pour concrete to the preset elevation.

[0041] Step 3: Insert the transition piece;

[0042] According to the designed position of the steel sheet piles 4 on both sides, the transition piece 2 is driven into the soil from the gaps between the foundation pit support piles 5 to the designed elevation, and must be aligned with the steel sheet piles 4 on both sides; the transition piece 2 has the transition piece opening steel plate 2-1 side inside the soil, and the bolt 2-4 side faces outside, and must be exposed for a length of not less than 10 cm to connect the channel steel piece 3.

[0043] Step 4: Plug in the connector;

[0044] The connector bayonet 1 - 2 of the connector 1 is inserted into the transition piece 2 and driven into the designed position. The connector 1 needs to be aligned with the designed position of the steel sheet pile 4 .

[0045] Step 5: Construction of steel sheet piles on both sides of the vertical support piles;

[0046] Align the locking ends of the first steel sheet piles 4 on both sides with the locking ends of the connector 1, insert and drive them to the required elevation, and then start driving the remaining steel sheet piles 4 in sequence. The adjacent steel sheet piles 4 on the left and right should be interlocked with each other.

[0047] Step 6: Construction of steel sheet piles away from the foundation pit side;

[0048] Avoid the anchor cables 8 and start constructing the steel sheet piles between the gaps of the anchor cables 8. If there are no anchor cables 8 between adjacent steel sheet piles 4, they should be interlocked with each other.

[0049] Step 7: Construction of channel steel parts;

[0050] Fix the channel steel part 3 to the foundation pit support pile 5 through bolts 2-4, and ensure that the two fit tightly.

[0051] Step 8: Excavation of foundation pit and construction of steel purlins;

[0052] Excavate the foundation pit of the cap in layers; use steel sheet piles 4 and foundation pit support piles 5 as back support, and set steel perimeter purlins 9 within the depth range of the foundation pit of the cap; adopt the principle of "excavating and supporting at the same time" and gradually set steel perimeter purlins 9 from shallow to deep; during the excavation of the foundation pit of the cap, the upper rotary drilling piles 6 need to be gradually chiseled out according to the installation requirements of the perimeter purlins 9.

[0053] Step 9: Construction of the foundation;

[0054] After the foundation of the rotary pile 6 is chiseled out to the designed elevation, the foundation 7 can be constructed.

[0055] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A bridge cap construction support device near a foundation pit, characterized in that: The invention comprises a connecting piece (1), a transition piece (2) and a steel sheet pile (4), wherein one end of the connecting piece (1) is connected to the steel sheet pile (4) through a connecting piece lock (1-1), and the other end of the connecting piece (1) is embedded in the transition piece (2) through a connecting piece bayonet (1-2); a channel steel piece (3) is fixed to the rear side of the transition piece (2), and foundation pit support piles (5) are arranged on both sides of the transition piece (2); both ends of the channel steel piece (3) are in contact with the foundation pit support piles (5) on both sides of the transition piece (2); adjacent steel sheet piles (4) on one side of the channel steel piece (3) are interlocked, and adjacent steel sheet piles (4) on one side parallel to the channel steel piece (3) are independently arranged; and steel purlins (9) are provided on the inner sides of the steel sheet piles (4) and foundation pit support piles (5) on each side.

2. A bridge cap construction support device near a foundation pit according to claim 1, characterized in that: The transition piece (2) comprises a transition piece opening steel plate (2-1), an internal H-shaped steel (2-2) and a transition piece rear side plate (2-3); the transition piece (2) is a hollow structure; an opening is provided on the transition piece opening steel plate (2-1); the internal H-shaped steel (2-2) is connected to the inner side of the transition piece rear side plate (2-3); and a plurality of bolts (2-4) are provided on the outer side of the transition piece rear side plate (2-3) in a vertical direction. The number of the channel steel members (3) in the vertical direction is the same as the number of the bolts (2-4) on the transition member (2).

3. A bridge cap construction support device near a foundation pit according to claim 2, characterized in that: The built-in H-shaped steel (2-2) is arranged in the connector bayonet (1-2), and the distance between the built-in H-shaped steel (2-2) and the transition piece opening steel plate (2-1) is the same as the width of the connector bayonet (1-2).

4. The bridge cap construction support device adjacent to a foundation pit according to claim 1, characterized in that: The length of the channel steel member (3) is greater than the spacing between adjacent foundation pit support piles (5).

5. The bridge cap construction support device adjacent to a foundation pit according to claim 1, characterized in that: The steel sheet piles (4) are Larsen steel sheet piles.

6. The bridge cap construction support device adjacent to a foundation pit according to claim 1, characterized in that: Diagonal braces (9-1) are provided at the four corners of the steel purlin (9).

7. The bridge cap construction support device adjacent to a foundation pit according to claim 1, characterized in that: A rotary drilling pile (6) is provided below the steel perimeter purlin (9).

8. The bridge cap construction support device near the foundation pit according to claim 7, characterized in that: The rotary drilling piles (6) are arranged in an array.

9. A method for supporting the construction of a bridge cap adjacent to a foundation pit based on the device of claim 1, characterized in that: The following steps are included: S1, driving the two transition pieces into the soil from the gaps between the foundation pit support piles to the designed elevation, and then inserting the connector bayonet of the connector into the transition piece; S2: Align the locking ends of the first steel sheet piles on both sides with the locking ends of the connectors, and drive them to the designed elevation. Then, start driving the remaining steel sheet piles in sequence, interlocking the adjacent steel sheet piles on the left and right sides. Drive the steel sheet piles parallel to the side of the foundation pit support piles individually to the designed elevation, and fix the channel steel members to the foundation pit support piles through transition pieces. S3, using steel sheet piles and foundation pit support piles as the back support, excavate the foundation pit in layers, and gradually set up steel purlins from shallow to deep.

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