L-shaped foamed concrete block pier foundation pit filling structure and construction method

Abstract

This invention provides a bridge pier foundation pit filling structure and construction method using L-shaped foamed concrete blocks, belonging to the field of road and bridge engineering construction technology. It includes: a foundation pit, at least one pile foundation, a pile cap, a bridge pier, and a filling structure; at least one pile foundation is located within the foundation pit; the bottom surface of the pile cap is connected to the top surface of the pile foundation; the bridge pier is connected to the top surface of the pile cap; this device fills the foundation pit by using an interlocking, layered, and overlapping method to fill the pit with L-shaped foamed concrete blocks, combined with a method of filling joints with cast-in-place foamed concrete. This strengthens the strength and integrity of the foundation pit filling material between the pile cap group and the bridge pier group, and utilizes the properties of foamed concrete to reduce the pressure of the backfill soil in the foundation pit, thus reducing the problems of bridge pier settlement and uneven settlement between bridge pier groups.

Description

Technical Field

[0001] This invention belongs to the field of road and bridge engineering construction technology, specifically relating to an L-shaped foamed concrete block pier foundation pit filling structure and construction method. Background Technology

[0002] my country's road and bridge infrastructure construction has developed rapidly, with the total mileage of basic transportation increasing rapidly. Road grades and traffic convenience have also improved rapidly. The need for road intersections and river crossings has increased, leading to a growing proportion of bridges in road traffic construction. However, bridge roads are more susceptible to uneven settlement than surface traffic. If a bridge is connected to the ground foundation only by piers, the bridge's stress is transferred to the ground foundation through the piers, and the bridge's structural condition is correspondingly affected by pier settlement. Excessive overall pier settlement and uneven settlement between piers can lead to adverse changes in the bridge's structural stress, thus affecting the bridge's structural safety. It can also easily cause unevenness in the bridge deck, affecting driving safety and comfort.

[0003] In existing technologies, the main measures to address pier settlement during bridge construction include reinforcing the integrity of the piers with crossbeams, lengthening the pile foundations, or increasing the size of the pier caps to reduce settlement. However, these measures can lead to problems such as increasing the pier's self-weight, which exacerbates settlement, and uneven settlement among multiple piers. Summary of the Invention

[0004] Based on the above-mentioned technical problems, the present invention provides a bridge pier foundation pit filling structure and construction method using L-shaped foamed concrete blocks. The device fills the foundation pit by interlocking, layering, and overlapping L-shaped foamed concrete blocks and combining this with cast-in-place foamed concrete grouting, thereby strengthening the strength and integrity of the foundation pit filling material between the pier group and the bridge pier group. It also utilizes the characteristics of foamed concrete to reduce the pressure of the backfill soil in the foundation pit, thereby reducing the problems of bridge pier settlement and uneven settlement between bridge pier groups.

[0005] The specific technical solution is as follows:

[0006] A bridge pier foundation pit filling structure using L-shaped foamed concrete blocks includes: a foundation pit, at least one pile foundation, a pile cap, a bridge pier, and a filling structure; at least one pile foundation is located within the foundation pit; the bottom surface of the pile cap is connected to the top surface of the pile foundation; the bridge pier is connected to the top surface of the pile cap; the filling structure includes foamed concrete blocks and foamed concrete, the foamed concrete blocks being L-shaped, interlocking and overlapping within the foundation pit, and the foamed concrete filling the space below the pile cap and between the foamed concrete blocks; wherein the number of pile caps and bridge piers is the same as the number of pile foundations, and two or more pile foundations, two or more pile caps, and two or more bridge piers are respectively referred to as a pile foundation group, a pile cap group, and a bridge pier group.

[0007] In addition, the L-shaped foamed concrete block pier foundation pit filling structure in the above-mentioned technical solution provided by the present invention may also have the following additional technical features:

[0008] In the above technical solution, the two sides of the foamed concrete block are right angled and of equal length.

[0009] In the above technical solution, foamed concrete is filled at the bottom of the foundation pit to form a foamed concrete layer with a thickness of 3-5cm, and foamed concrete blocks are filled on the top surface of the foamed concrete layer.

[0010] In the above technical solution, the depth of the foundation pit is less than or equal to 6m, the soil layer at the bottom of the foundation pit is located below the bottom of the foundation, the distance between the soil layer at the bottom of the foundation pit and the bottom of the foundation is less than or equal to 2m, and the soil layer at the bottom of the foundation pit is dense and flat.

[0011] The above technical solution includes the following steps in its application:

[0012] S1: Determine the mold size of L-shaped foamed concrete blocks according to the size of the foundation pit and the space of the pile cap group and pile foundation group, and prefabricate the L-shaped foamed concrete blocks in the factory according to the size specifications and prepare the raw materials for cast-in-place foamed concrete according to the mix proportion.

[0013] S2: Adjust the depth of the excavated foundation pit to the set height, and gradually remove the foundation pit retaining support according to the construction progress. Then level the surface of the soil layer at the bottom of the foundation pit and clean the soil between the pile foundation groups.

[0014] S3: Lay a layer of foamed concrete at the bottom of the foundation pit. Arrange and fill foamed concrete blocks in the foamed concrete layer according to the set requirements. After each layer of foamed concrete blocks is laid, fill the gaps between layers and the gaps between piles with cast-in-place foamed concrete until the foundation pit is filled.

[0015] In the above technical solution, the method of arranging and filling foamed concrete blocks according to the set requirements is as follows:

[0016] In the transverse direction of the foamed concrete layer, the foamed concrete blocks are arranged in a scale-like pattern, with the edges of the piers and abutments as the center, and in the longitudinal direction, a staggered filling method is adopted for layered and overlapping.

[0017] The present invention provides a bridge pier foundation pit filling structure and construction method using L-shaped foamed concrete blocks, which, compared with the prior art, has the following advantages:

[0018] 1. The main body of the foundation pit is constructed by interlocking and overlapping L-shaped foamed concrete blocks, which increases the strength of the backfill structure and makes full use of the fluidity of foamed concrete to fill the gaps. The L-shaped foamed concrete blocks fill the gaps to form the cast-in-place main body and frame, thereby increasing the integrity of the structure. Furthermore, the combination of cast-in-place construction method and foamed concrete blocks reduces the adverse effects caused by the shrinkage of foamed concrete during casting.

[0019] 2. By utilizing the fluidity and lightweight properties of foamed concrete, the pressure of the pier's self-weight on the backfill soil of the foundation pit is reduced, and the strength and integrity of the foundation pit filling between the abutment group and the pier group are enhanced. Therefore, the effect of uniform settlement of the piers can be achieved without adding a connection structure between the piers, thereby reducing pier settlement and alleviating the problem of uneven settlement between multiple piers.

[0020] 3. By using foamed concrete to fill and reinforce the foundation pit, the economic cost is reduced, and this construction method is characterized by energy saving, environmental protection, and strong adaptability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of multiple bridge piers of a bridge pier foundation pit filling structure using L-shaped foamed concrete blocks according to the present invention.

[0022] Figure 2 This is a schematic diagram of the structure of a single bridge pier of an L-shaped foamed concrete block bridge pier foundation pit filling structure according to the present invention.

[0023] Figure 3 This is a top view of the pier section of the present invention;

[0024] Figure 4 This is a top view of the pier section of the present invention;

[0025] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0026] 1. Foundation pit, 2. Foamed concrete blocks, 3. Bridge piers, 4. Foamed concrete, 5. Pile foundation, 6. Pier cap. Detailed Implementation

[0027] The following are specific implementation cases and appendices. Figure 1-4 The present invention will be further described, but the present invention is not limited to these embodiments.

[0028] A bridge pier foundation pit filling structure using L-shaped foamed concrete blocks, such as Figure 1-4As shown, the structure includes: a foundation pit 1, at least one pile foundation 5, a pile cap 6, a bridge pier 3, and an infill structure; at least one pile foundation 5 is located within the foundation pit 1; the bottom surface of the pile cap 6 is connected to the top surface of the pile foundation 5; the bridge pier 3 is connected to the top surface of the pile cap 6; the infill structure includes foamed concrete blocks 2 and foamed concrete 4, the foamed concrete blocks 2 are L-shaped, and the foamed concrete blocks 2 are interlocked and overlapped to fill the foundation pit 1, and the foamed concrete 4 is filled below the pile cap 6 and in the gaps between the foamed concrete blocks 2; wherein, the number of pile caps 6 and bridge piers 3 is the same as the number of pile foundations 5, and two or more pile foundations 5, two or more pile caps 6, and two or more bridge piers 3 are respectively referred to as a pile foundation group, a pile cap group, and a bridge pier group.

[0029] By using L-shaped foamed concrete blocks 2 in an interlocking, layered, and overlapping manner to construct the main body of foundation pit 1, the strength of the backfill structure is increased. The fluidity of foamed concrete 4 is fully utilized to fill the voids, forming a cast-in-place main body and frame within the spaces filled by the L-shaped foamed concrete blocks 2. This increases the structural integrity. Furthermore, the combination of cast-in-place construction with foamed concrete blocks 2 reduces the adverse effects of shrinkage caused by the setting of foamed concrete 4. The fluidity and lightweight nature of foamed concrete 4 also reduces the pressure of the piers 3's self-weight on the backfill soil of foundation pit 1, and enhances the strength and integrity of the foundation pit 1 fill material between the abutment group and the pier group. Therefore, uniform settlement of piers 3 can be achieved without adding connecting structures between them, thus reducing pier settlement and mitigating uneven settlement among multiple piers 3, ensuring the safety of the bridge structure and the comfort of driving. Compared to other foundation pit 1 reinforcement materials, using foamed concrete 4 for foundation pit 1 reinforcement reduces economic costs, and this construction method is energy-saving, environmentally friendly, and highly adaptable.

[0030] Specifically, when there are multiple piers 3, such as Figure 1 As shown; when pier 3 is a single pier, as Figure 2 As shown.

[0031] Specifically, the construction method of using precast L-shaped foamed concrete blocks combined with cast-in-place construction shortened the construction time and reduced economic costs.

[0032] Specifically, this application utilizes an interlocking, layered, and overlapping method to fill L-shaped foamed concrete blocks 2, combined with cast-in-place foamed concrete 4 for joint filling, to fill the foundation pit 1. This strengthens the strength and integrity of the foundation pit 1 filling material between the pier group and the bridge pier group. Therefore, it can reduce settlement and achieve uniform settlement between the bridge piers 3 without increasing the weight of the bridge piers 3. Furthermore, this application uses L-shaped foamed concrete blocks 2 combined with cast-in-place foamed concrete 4 to solve the problem of uniform settlement. Since the cost of foamed concrete blocks 2 and foamed concrete 4 is low, the economic cost is reduced.

[0033] Specifically, foamed concrete 4 has the characteristics of being lightweight, having good fluidity, good hydraulic properties, easy construction, and being economical. Therefore, using foamed concrete 4 as the filling material for foundation pit 1 has the characteristics of being lightweight, having a bearing capacity and strength greater than soil, and having a lower cost than cement concrete, thereby achieving the effect of reducing the settlement of bridge pier 3 and reducing uneven settlement between bridge pier 3.

[0034] Specifically, this application solves the problems of long setting time, easy shrinkage and cracking, and collapse caused by weak foam stability of foam concrete 4 during construction by pre-preparing foam concrete 4 into foam concrete blocks 2 in advance and combining foam concrete blocks 2 with the cast-in-place construction method.

[0035] In an embodiment of the present invention, the two sides of the foamed concrete block 2 are right angled and of equal length.

[0036] By prefabricating the foamed concrete 4 into L-shaped foamed concrete blocks 2, and making the two sides of the foamed concrete blocks 2 right angled and of equal length, the blocks are tightly bonded together during filling to avoid misalignment.

[0037] Specifically, the size of the foamed concrete block 2 is determined according to the space between the pile foundations under the foundation 6, so that it can be placed in the space between the pile foundations under the foundation 6 and the gap is reduced.

[0038] In an embodiment of the present invention, foamed concrete 4 is filled at the bottom of the foundation pit 1 to form a layer of foamed concrete 4, the thickness of the foamed concrete 4 layer is 3-5cm, and foamed concrete blocks 2 are filled on the top surface of the foamed concrete 4 layer.

[0039] When filling the foundation pit 1, four layers of foamed concrete, each 3-5 cm thick, must first be laid at the bottom of the foundation pit 1. The flatness of the soil layer must be ensured. Then, L-shaped foamed concrete blocks 2 are laid in overlapping layers. After each layer of foamed concrete blocks 2 is filled, cast-in-place foamed concrete 4 is poured to fill the gaps between the blocks and cover the surface of the blocks. The process of laying foamed concrete blocks 2 and pouring foamed concrete 4 is repeated until the foundation pit 1 is filled.

[0040] Specifically, the filling process takes less time than the initial setting time of foamed concrete 4.

[0041] In an embodiment of the present invention, the depth of the foundation pit 1 is less than or equal to 6m, the bottom soil layer of the foundation pit 1 is located below the bottom of the foundation 6, the distance between the bottom soil layer of the foundation pit 1 and the bottom of the foundation 6 is less than or equal to 2m, and the bottom soil layer of the foundation pit 1 is dense and flat.

[0042] By laying the bottom soil layer of the foundation pit 1 and then filling the gaps between the foam concrete blocks 2 and the gaps around the foundation pit 1 and the pile foundation 5 after each layer of foam concrete blocks 2 is laid, the compactness of the filling is ensured.

[0043] In embodiments of the present invention, the method includes the following steps:

[0044] S1: Determine the mold size of L-shaped foamed concrete block 2 based on the size of foundation pit 1 and the space of pile cap group and pile foundation group, and prefabricate L-shaped foamed concrete block 2 in the factory according to the size specifications and prepare the raw materials for cast-in-place foamed concrete 4 according to the proportion.

[0045] S2: Adjust the depth of the excavated foundation pit 1 to the set height, and gradually remove the retaining wall of foundation pit 1 according to the construction progress. Then level the surface of the soil layer at the bottom of foundation pit 1 and clean the soil between the pile foundation groups.

[0046] S3: Lay 4 layers of foamed concrete at the bottom of the foundation pit 1. Then, lay foamed concrete blocks 2 in the foamed concrete 4 layers according to the set requirements. After each layer of foamed concrete blocks 2 is laid, fill the gaps between layers and the gaps between piles with cast-in-place foamed concrete 4 until the foundation pit 1 is filled.

[0047] In an embodiment of the present invention, the method of arranging and filling the foamed concrete blocks 2 in four layers of foamed concrete according to set requirements is as follows:

[0048] In the transverse layer of the 4-layer foamed concrete, the foamed concrete blocks 2 are arranged in a scale-like pattern outward from the edges of the piers 3 and the abutment 6, and in the longitudinal direction, they are staggered by layering and overlapping.

[0049] By arranging the "L"-shaped foamed concrete blocks 2 in a scale-like pattern outward from the edges of the piers 3 and the abutments 6 in the same horizontal layer, and using a staggered filling method of layered cross-overlay in the longitudinal direction, the bonding strength and integrity are guaranteed.

[0050] In the description of this invention, the term "a plurality of" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0051] In the description of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A pier foundation filling structure of L-shaped foam concrete block, characterized by, include: Foundation pit; At least one pile foundation, wherein at least one of the pile foundations is disposed within the foundation pit; A pile cap, the bottom surface of which is connected to the top surface of the pile foundation; The bridge pier is connected to the top surface of the pier cap; The filling structure includes foamed concrete blocks and foamed concrete. The foamed concrete blocks are L-shaped and are interlocked and overlapped in the foundation pit. The foamed concrete fills the area below the foundation and the gaps between the foamed concrete blocks. The number of the pile caps and the number of the bridge piers are the same as the number of the pile foundations, and two or more pile foundations, two or more pile caps and two or more bridge piers are respectively referred to as pile foundation groups, pile cap groups and bridge pier groups. The foamed concrete block has two sides that are right angled and of equal length; The foamed concrete is filled at the bottom of the foundation pit to form a foamed concrete layer with a thickness of 3-5cm, and the foamed concrete blocks are filled on the top surface of the foamed concrete layer. The depth of the foundation pit is less than or equal to 6m, the bottom soil layer of the foundation pit is located below the bottom of the foundation, the distance between the bottom soil layer of the foundation pit and the bottom of the foundation is less than or equal to 2m, and the bottom soil layer of the foundation pit is dense and flat. The specific method by which the foamed concrete layer is filled with foamed concrete blocks according to the set requirements is as follows: In the transverse direction of the foamed concrete layer, the foamed concrete blocks are arranged in a scale-like pattern, with the edges of the piers and abutments as the center, and in the longitudinal direction, a staggered filling method is adopted for layered and overlapping.

2. The construction method of the pier foundation pit filling structure of L-shaped foam concrete block, applied to the pier foundation pit filling structure of L-shaped foam concrete block according to claim 1, characterized in that, The construction method includes the following steps: S1: Determine the mold size of L-shaped foamed concrete blocks according to the size of the foundation pit and the space of the pile cap and pile foundation group, and prefabricate the L-shaped foamed concrete blocks in the factory according to the size specifications and prepare the raw materials for cast-in-place foamed concrete according to the proportion. S2: Adjust the depth of the excavated foundation pit to the set height, and gradually remove the foundation pit retaining support according to the construction progress. Then level the surface of the soil layer at the bottom of the foundation pit and clean the soil between the pile foundation groups. S3: Lay a layer of foamed concrete at the bottom of the foundation pit. Arrange and fill foamed concrete blocks in the foamed concrete layer according to the set requirements. After each layer of foamed concrete blocks is laid, fill the gaps between layers and the gaps between piles with cast-in-place foamed concrete until the foundation pit is filled.

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