Damping structure for expanding pile head

Abstract

The invention provides an expanded pile head vibration reduction structure, and belongs to the technical field of construction engineering vibration control. Comprising a pile body lower longitudinal bar assembly, and the upper portion of the pile body lower longitudinal bar assembly is connected with an expanding pile head; the expanding pile head comprises a steel sleeve, a lower-end steel plate is fixed in the steel sleeve, and the upper end of the pile body lower longitudinal bar assembly is fixedly connected with the steel sleeve and the lower-end steel plate; a plurality of stiffening plates are uniformly distributed and connected to the circumference of the outer circular surface of the steel sleeve, and a plurality of pile head expanding additional longitudinal bars are uniformly distributed and fixed on each stiffening plate; vibration reduction pads are laid on the upper surface of the lower end steel plate, the inner side surface of the steel sleeve and the upper surface of the expanded pile head to form a staggered slab vibration reduction structure, and a pile body upper longitudinal bar assembly is installed on the upper portion of the lower end steel plate. The vibration reduction structure is suitable for a vibration reduction structure of a pile head in building pile foundation types, and for pile foundation types such as piled rafts and the like, under the condition that the vertical vibration isolation requirement of an upper building is met, the anti-pulling requirement of a pile can also be met, and meanwhile the requirement for horizontal force resistance of a pile top can also be met.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration control of construction projects, and in particular relates to an enlarged pile head vibration reduction structure. Background Art

[0002] With the rapid development of urban rail transit, on the one hand, urban rail transit has brought great convenience to people's transportation. On the other hand, with the intensive development of rail transit lines and people's increasing attention to the environment, other environmental vibrations such as transportation facilities have had a great impact on sensitive buildings within a certain range around them. Regarding the existing vibration reduction technology of building foundation vibration reduction pads, the polyurethane / rubber vibration reduction pads currently on the market are only suitable for raft foundations; for pile foundation types such as pile rafts, on the one hand, due to the extremely large pressure on the top of the pile, there are no vibration reduction pad products on the market that are suitable for ultra-large loads; on the other hand, if the vibration reduction pad is forcibly laid on the top of the pile to separate the pile foundation, the force mode of the top of the pile will be changed, or it will not be suitable for pile foundations with pull-out and horizontal force resistance requirements. In order to solve the above problems, it is urgent to propose a vibration reduction structure that enlarges the pile head. Summary of the invention

[0003] The technical problem solved by the present invention is to provide an enlarged pile head vibration reduction structure, which is intended to be applicable to the overall vibration reduction control of building foundations of pile foundation types such as pile rafts.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A vibration reduction structure for an enlarged pile head, comprising a lower longitudinal reinforcement assembly for a pile body, wherein the upper portion of the lower longitudinal reinforcement assembly for the pile body is connected to the enlarged pile head; the enlarged pile head comprises a steel sleeve, wherein a lower end steel plate is fixed inside the steel sleeve, and the upper end of the lower longitudinal reinforcement assembly for the pile body is fixedly connected to the steel sleeve and the lower end steel plate; a plurality of stiffening plates are evenly distributed and connected to the circumference of the outer circumferential surface of the steel sleeve, and each of the stiffening plates is evenly distributed and fixed with a plurality of additional longitudinal reinforcements for the enlarged pile head; vibration reduction pads are laid on the upper surface of the lower end steel plate, the inner surface of the steel sleeve and the upper surface of the enlarged pile head to form a staggered vibration reduction structure, an upper longitudinal reinforcement assembly for the pile body is installed on the upper portion of the lower end steel plate, and the lower end of the upper longitudinal reinforcement assembly for the pile body is inserted into the steel sleeve and supported on the lower end steel plate; the vibration reduction pads are all made of polyurethane / rubber material.

[0006] To further limit the above scheme, the vibration damping pad includes a horizontal vibration damping pad on the upper part of the pile body laid on the upper surface of the lower end steel plate, an inner vibration damping pad on the upper part of the pile body laid on the inner surface of the steel sleeve, and a horizontal vibration damping pad on the enlarged pile head laid on the upper surface of the enlarged pile head. The horizontal vibration damping pad on the upper part of the pile body and the horizontal vibration damping pad on the enlarged pile head form a staggered vibration damping structure through a stepped structure.

[0007] As a further limitation of the above scheme, the plurality of stiffening plates are arranged radially on the outer circumferential surface of the steel sleeve, are evenly distributed around the circumference, and are fixedly connected to the steel sleeve by welding.

[0008] To further define the above scheme, the lower longitudinal reinforcement assembly of the pile body includes lower longitudinal reinforcement of the pile body and lower stirrups of the pile body, the lower longitudinal reinforcement of the pile body is tied by the lower stirrups of the pile body, and the upper end of the lower longitudinal reinforcement of the pile body is fixedly connected to the inner wall of the steel sleeve and the lower end steel plate by welding.

[0009] To further define the above scheme, the upper longitudinal reinforcement assembly of the pile body includes upper longitudinal reinforcement of the pile body and upper stirrups of the pile body, the upper longitudinal reinforcement of the pile body is tied by the upper stirrups of the pile body, and the lower end of the upper longitudinal reinforcement of the pile body is fixedly connected with the upper end steel plate by welding.

[0010] The advantages of the present invention compared with the prior art are:

[0011] 1. This scheme is a vibration reduction structure suitable for pile heads in building pile foundation types. For pile foundation types such as pile rafts, it can meet the pullout requirements of the piles while meeting the vertical vibration isolation requirements of the upper buildings, and also meet the requirements for the pile top to resist horizontal forces. This pile head has a simple structure and is suitable for overall vibration reduction measures for building foundations such as pile rafts. It is easy to construct and has broad prospects for engineering application.

[0012] 2. This solution can effectively increase the effective pressure-bearing area of ​​the pile head vibration damping pad by expanding the vibration damping structure of the pile head, so that the vibration damping pad can reach the working load range corresponding to the full performance of the vibration damping performance;

[0013] 3. This solution achieves effective vertical vibration control by expanding the vibration reduction structure of the pile head so that the vibration reduction pad can fully bear the vertical pressure;

[0014] 4. This scheme expands the vibration reduction structure of the pile head, expands the additional longitudinal reinforcement of the pile head and welds it to the stiffening plate, and welds the longitudinal reinforcement at the lower part of the pile body to the inner side of the steel sleeve, so that the expanded pile head is also suitable for pile foundations with pull-out resistance requirements;

[0015] 5. This scheme expands the vibration reduction structure of the pile head so that the vibration reduction pad arranged between the expanded pile head and the raft slab / cap forms a staggered structure, and then expands the diameter of the pile head so that the pile top position can resist a larger horizontal force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the following briefly introduces the drawings required for use in the description of the technical solution of the embodiment. It should be understood by those skilled in the art that the drawings are not drawn to scale and are only for illustrative purposes. The following takes an enlarged pile head as an example.

[0017] Figure 1 A schematic diagram of an enlarged pile head vibration reduction structure;

[0018] Figure 2 This is a schematic diagram of a large-scale node of an enlarged pile head vibration reduction structure;

[0019] Figure 3 It is a schematic diagram of a plane of a node of an enlarged pile head vibration reduction structure;

[0020] Figure 4 The present invention is a flow chart of construction steps for enlarging a pile head vibration reduction structural node.

[0021] In the figure: 1 is the lower longitudinal reinforcement assembly of the pile body, 1-1 is the lower longitudinal reinforcement of the pile body, 1-2 is the lower stirrups of the pile body, 2 is the enlarged pile head, 2-1 is the lower end steel plate, 2-2 is the steel sleeve, 2-3 is the additional longitudinal reinforcement of the enlarged pile head, 2-4 is the stiffening plate, 3 is the vibration damping pad, 3-1 is the upper horizontal vibration damping pad of the pile body, 3-2 is the inner vibration damping pad of the steel sleeve of the pile body, 3-3 is the horizontal vibration damping pad of the enlarged pile head, 4 is the raft / cap, 5 is the upper longitudinal reinforcement assembly of the pile body, 5-1 is the upper longitudinal reinforcement of the pile body, 5-2 is the upper stirrups of the pile body, 5-3 is the upper end steel plate, 6 is the waterproof layer, and 7 is the cushion layer. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0024] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0025] See also Figure 1-4 , describe the embodiments of the present invention in detail.

[0026] Embodiment: An enlarged pile head vibration reduction structure, see Figure 1-3 As shown, it includes a pile body lower longitudinal reinforcement component 1, and the upper part of the pile body lower longitudinal reinforcement component 1 is connected to the enlarged pile head 2; the enlarged pile head 2 includes a steel sleeve 2-2, and a lower end steel plate 2-1 is fixed inside the steel sleeve 2-2, and the upper end of the pile body lower longitudinal reinforcement component 1 is fixedly connected to the steel sleeve 2-2 and the lower end steel plate 2-1; a plurality of stiffening plates 2-4 are evenly connected to the circumference of the outer circumferential surface of the steel sleeve 2-2, and each of the stiffening plates 2-4 is evenly fixed with a plurality of enlarged pile head additional longitudinal reinforcements 2-3; vibration damping pads 3 are laid on the upper surface of the lower end steel plate 2-1, the inner surface of the steel sleeve 2-2 and the upper surface of the enlarged pile head 2 to form a staggered vibration damping structure, and a pile body upper longitudinal reinforcement component 5 is installed on the upper part of the lower end steel plate 2-1, and the lower end of the pile body upper longitudinal reinforcement component 5 is inserted into the steel sleeve 2-2 and supported on the lower end steel plate 2-1.

[0027] In a specific embodiment: the vibration damping pad 3 includes a horizontal vibration damping pad 3-1 on the upper part of the pile body laid on the upper surface of the lower end steel plate 2-1, a steel sleeve inner vibration damping pad 3-2 on the upper part of the pile body laid on the inner surface of the steel sleeve 2-2, and an enlarged pile head horizontal vibration damping pad 3-3 laid on the upper surface of the enlarged pile head 2. The horizontal vibration damping pad 3-1 on the upper part of the pile body and the horizontal vibration damping pad 3-3 on the enlarged pile head form a staggered vibration damping structure through a stepped structure.

[0028] Preferably, the vibration damping pads are all made of polyurethane / rubber material.

[0029] In a specific implementation manner: the plurality of stiffening plates 2-4 are radially arranged on the outer circumferential surface of the steel sleeve 2-2 and are evenly distributed around the circumference, and the stiffening plates 2-4 are fixedly connected to the steel sleeve 2-2 by welding.

[0030] In a specific embodiment: the pile body lower longitudinal reinforcement assembly 1 includes a pile body lower longitudinal reinforcement 1-1 and a pile body lower stirrup 1-2, the pile body lower longitudinal reinforcement 1-1 is tied by the pile body lower stirrup 1-2 in a winding manner, and the upper end of the pile body lower longitudinal reinforcement 1-1 is fixedly connected to the inner wall of the steel sleeve 2-2 and the lower end steel plate 2-1 by welding.

[0031] In a specific embodiment: the upper longitudinal reinforcement assembly 5 of the pile body includes an upper longitudinal reinforcement 5-1 and an upper stirrup 5-2 on the pile body, the upper longitudinal reinforcement 5-1 on the pile body is tied by the upper stirrup 5-2 in a winding manner, and the lower end of the upper longitudinal reinforcement 5-1 on the pile body is fixedly connected to the upper end steel plate 5-3 by welding.

[0032] The above technical solution can effectively increase the effective bearing area of ​​the pile head vibration damping pad by expanding the vibration damping structure of the pile head, so that the vibration damping pad can reach the working load range corresponding to fully exerting the vibration damping performance.

[0033] The above technical solution achieves effective vertical vibration control by enlarging the vibration reduction structure of the pile head so that the vibration reduction pad can fully bear the vertical pressure.

[0034] The above technical solution expands the vibration reduction structure of the pile head, welds the additional longitudinal reinforcement of the pile head to the stiffening plate, and welds the lower longitudinal reinforcement of the pile body to the inner side of the steel sleeve, so that the expanded pile head is also suitable for pile foundations with pull-out resistance requirements.

[0035] The above technical solution enlarges the vibration reduction structure of the pile head so that the vibration reduction pad arranged between the enlarged pile head and the raft / cap forms a staggered structure, and then expands the diameter of the pile head so that the pile top position can resist a larger horizontal force.

[0036] A construction method for enlarging a pile head vibration reduction structure, see Figure 4 As shown, the specific construction steps include the following:

[0037] Step 1): Tie the lower longitudinal reinforcement 1-1 and the lower stirrups 1-2 of the pile body, and install the steel sleeve 2-2;

[0038] Step 2): welding the lower longitudinal reinforcement 1-1 of the pile body to the inner wall of the steel sleeve 2-2;

[0039] Step 3): Position the stiffening plate 2-4, and weld the stiffening plate 2-4 to the outer wall of the steel sleeve 2-2;

[0040] Step 4): enlarging the pile head and attaching the additional longitudinal reinforcement 2-3 to the stiffening plate 2-4 by welding;

[0041] Step 5): The upper steel plate 5-3, the upper longitudinal reinforcement 5-1 of the pile body and the upper stirrups 5-2 of the pile body are pre-welded on site;

[0042] Step 6): pouring pile body concrete and chiseling away the pile head;

[0043] Step 7): Welding the lower longitudinal reinforcement 1-1 of the lower pile body to the lower end steel plate 2-1;

[0044] Step 8): Lay the horizontal vibration damping pad 3-1 on the upper part of the pile body, the vibration damping pad 3-2 inside the steel sleeve on the upper part of the pile body, and the horizontal vibration damping pad 3-3 on the expanded pile head;

[0045] Step 9): Install the upper steel plate 5-3, the upper longitudinal reinforcement 5-1 and the upper stirrups 5-2 of the pile body pre-welded in step 5, so that the lower end of the upper longitudinal reinforcement assembly 5 of the pile body is inserted into the steel sleeve 2-2 and supported on the lower steel plate 2-1;

[0046] Step 10): Install the waterproof layer 6 and the cushion layer 7;

[0047] Step 11): pouring concrete to form a raft slab / cap 4.

[0048] The present invention is a vibration reduction structure suitable for pile heads in building pile foundation types. For pile foundation types such as pile rafts, it can meet the pullout requirements of the piles while meeting the vertical vibration isolation requirements of the upper building, and also meet the requirements for the pile top to resist horizontal forces. The pile head has a simple structure and is suitable for overall vibration reduction measures for building foundations such as pile rafts. It is easy to construct and has broad prospects for engineering application.

[0049] The content of the present invention and the technical content not specifically described in the above embodiments are the same as the prior art.

[0050] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An enlarged pile head vibration reduction structure, characterized in that: The invention comprises a pile body lower longitudinal reinforcement assembly (1), wherein the upper part of the pile body lower longitudinal reinforcement assembly (1) is connected to an enlarged pile head (2); the enlarged pile head (2) comprises a steel sleeve (2-2), a lower end steel plate (2-1) is fixed inside the steel sleeve (2-2), and the upper end of the pile body lower longitudinal reinforcement assembly (1) is fixedly connected to the steel sleeve (2-2) and the lower end steel plate (2-1); a plurality of stiffening plates (2-4) are evenly distributed and connected to the outer circumference of the steel sleeve (2-2), and each of the stiffening plates (2-4) is evenly distributed and fixed with a plurality of enlarged pile head additional longitudinal reinforcements (2-3); the lower end steel sleeve (2-2) is fixedly connected to the lower end steel plate (2-1); Vibration-damping pads (3) are laid on the upper surface of the plate (2-1), the inner surface of the steel sleeve (2-2) and the upper surface of the enlarged pile head (2) to form a staggered vibration-damping structure. The staggered vibration-damping structure arranged between the enlarged pile head (2) and the raft slab / capping platform can achieve the goal of making the pile top position resist a larger horizontal force by expanding the diameter of the pile head; an upper longitudinal reinforcement assembly (5) of the pile body is installed on the upper part of the lower end steel plate (2-1), and the lower end of the upper longitudinal reinforcement assembly (5) of the pile body is inserted into the steel sleeve (2-2) and supported on the lower end steel plate (2-1); the vibration-damping pads (3) are all made of polyurethane / rubber material.

2. The enlarged pile head vibration reduction structure according to claim 1, characterized in that: The vibration damping pad (3) comprises a pile body upper horizontal vibration damping pad (3-1) laid on the upper surface of the lower end steel plate (2-1), a pile body upper steel sleeve inner vibration damping pad (3-2) laid on the inner surface of the steel sleeve (2-2), and an enlarged pile head horizontal vibration damping pad (3-3) laid on the upper surface of the enlarged pile head (2); the pile body upper horizontal vibration damping pad (3-1) and the enlarged pile head horizontal vibration damping pad (3-3) form a staggered vibration damping structure through a stepped structure.

3. The enlarged pile head vibration reduction structure according to claim 1, characterized in that: The plurality of stiffening plates (2-4) are arranged in a radial shape on the outer circumferential surface of the steel sleeve (2-2), are evenly distributed around the circumference, and are fixedly connected to the steel sleeve (2-2) by welding.

4. The enlarged pile head vibration reduction structure according to claim 1, characterized in that: The pile body lower longitudinal reinforcement assembly (1) comprises a pile body lower longitudinal reinforcement (1-1) and a pile body lower stirrup (1-2), the pile body lower longitudinal reinforcement (1-1) is bound by the pile body lower stirrup (1-2), and the upper end of the pile body lower longitudinal reinforcement (1-1) is fixedly connected to the inner wall of the steel sleeve (2-2) and the lower end steel plate (2-1) by welding.

5. The enlarged pile head vibration reduction structure according to claim 1, characterized in that: The pile shaft upper longitudinal reinforcement assembly (5) comprises a pile shaft upper longitudinal reinforcement (5-1) and a pile shaft upper stirrup (5-2), the pile shaft upper longitudinal reinforcement (5-1) is bound by the pile shaft upper stirrup (5-2), and the lower end of the pile shaft upper longitudinal reinforcement (5-1) is fixedly connected to the upper end steel plate (5-3) by welding.

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