Anti-settlement structure for overpass bridge pile foundation in expansive soil area

Abstract

The invention discloses an overpass bridge pile foundation anti-sedimentation structure in an expansive soil area, and relates to the technical field of pile foundation anti-sedimentation, the overpass bridge pile foundation anti-sedimentation structure comprises a pile foundation structure and an anti-sedimentation mechanism; the anti-settling mechanism comprises a first reinforcing structure and a second reinforcing structure; the bearing plate of the first reinforcing structure penetrates into bed rock through multiple rows of anchor bolts, the uplift bearing capacity is greatly improved compared with the prior art, uplift force of expansive soil can be borne, horizontal thrust is decomposed into axial pressure and shear force through a triangular structure formed by the supporting pieces, local stress concentration of the pile foundation structure is reduced through elastic buffering of an elastic cushion, and the pile foundation structure is more stable. A second reinforcing structure rigidly connects second connecting sleeves of adjacent pile foundation structures through connecting columns, the load dispersion efficiency is improved, differential settlement of adjacent pile foundations is controlled within a small range, an attaching plate of an inclined reinforcing column is attached to the curved surfaces of the pile foundations, the shear rigidity is improved, and the pile foundation structure is suitable for the soil mass with the high expansion grade; the shear deformation of the expansive soil is effectively resisted.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pile foundation anti-settlement, and specifically relates to an expansive soil area overline bridge pile foundation anti-settlement structure. BACKGROUND

[0002] The expansive soil area refers to an area where expansive soil is widely distributed. Such soil has the characteristics of "water absorption expansion and water loss shrinkage", which can have special and complex effects on engineering construction (especially foundation, road, bridge, etc.). Highway bridge engineering includes bridge main body engineering and auxiliary engineering facilities in bridge site as a whole. In highway bridge engineering, the bridge pile foundation will settle after a long period of use or vehicle overload, and the settlement of the pile foundation is prone to cause deformation, cracking and even fracture of the bridge, which poses a life safety hazard to drivers.

[0003] The application with the publication number CN221702392U discloses a highway bridge pile foundation anti-settlement device, which comprises a bridge mounting plate, a pile body is fixedly installed on the left and right sides of the bottom of the bridge mounting plate, a pre-buried column body is sleeved on the bottom of the pile body, a circular bottom plate is fixedly installed on the upper surface of the pre-buried column body, the inner diameter of the pre-buried column body is larger than the diameter of the pile body, and a filling body is arranged in the pre-buried column body. The basic body, the pre-buried column body, the bottom plate, the filling body, the clamping ring, the fixed screw rod, the friction plate, the adjusting screw rod, the inclined plate and the insertion rod are used in cooperation, have the advantages of simple structure and adaptability to different diameters of the pile foundation. When in use, the pile foundation with different diameters can be fixed at the bottom, and the column body of the bridge pile foundation can be stably supported, so that the stability of the bridge pile foundation is improved, the settlement of the pile foundation is prevented, the device is easy to install, and the use of workers is facilitated. However, the contact area of the limiting plate and the friction plate is small, the horizontal thrust resistance to the high expansibility soil is insufficient, the lateral displacement of the pile foundation may be out of limit, the filling body in the pre-buried column body is poured with concrete, the initial strength is high, but the repeated expansion and shrinkage of the expansive soil can cause gaps between the concrete and the pile body, resulting in reinforcement failure, and the device cannot meet the needs of people. SUMMARY

[0004] The application aims to solve the technical problems in the prior art. To this end, the application provides an expansive soil area overline bridge pile foundation anti-settlement structure.

[0005] The expansion soil area overpass bridge pile foundation anti-settlement structure, including: the top end support bridge bottom end fixed in the pile foundation structure of bedrock and the anti-settlement mechanism connected with the pile foundation structure;The anti-settlement mechanism includes several groups of first reinforcing structure arranged on both sides of the pile foundation structure and preliminarily reinforcing the pile foundation structure and the second reinforcing structure arranged on the inner side of the pile foundation structure and further reinforcing with the first reinforcing structure;Wherein, the pile foundation structure is composed of a plurality of equidistantly distributed bearing columns, the first reinforcing structure is arranged on both sides of the bearing column, and the second reinforcing structure is arranged between the two groups of bearing columns.

[0006] As a further scheme of the application: the first reinforcing structure includes pressure plates arranged on both sides of the bearing column, fitting blocks connecting the pressure plates with the lower end of the bearing column and a plurality of groups of anchor bolts fixing the pressure plates into the bedrock, the pressure plates are arranged in the expansion soil layer, a plurality of groups of the anchor bolts are arranged on the lower end face of the pressure plate, and a plurality of groups of the anchor bolts are distributed in a rectangular array.

[0007] As a further scheme of the application: the anti-settlement mechanism further includes a support piece of "R" shape structure fixedly installed on the upper end of the pressure plate and a first connecting sleeve detachably connecting the support piece with the bearing column, a triangular stable structure is formed between the support piece and the pressure plate;The inner wall of the first connecting sleeve is provided with an elastic pad fitted with the bearing column, and two first connecting sleeves are symmetrically arranged on both sides of the bearing column and fixed by a fastening bolt.

[0008] As a further scheme of the application: the second reinforcing structure includes a second connecting sleeve detachably connected with the bearing column on the upper side of the first connecting sleeve and a connecting column fixedly connecting adjacent two second connecting sleeves, two second connecting sleeves are symmetrically arranged on both sides of the bearing column and fixed by a fastening bolt, a reinforcing bolt fixed with the bearing column is arranged on the second connecting sleeve, one end of the reinforcing bolt is installed in the bearing column, and the first connecting sleeve and the second connecting sleeve are both arranged as a half ring structure.

[0009] As a further scheme of the application: the anti-settlement mechanism further includes a fitting plate detachably fixed with the bearing column, a reinforcing column supporting and connecting the fitting plate with the connecting column and a fixing block fixing the reinforcing column to the lower end of the connecting column, the reinforcing column is arranged as an inclined structure, a fixing groove connected with the fixing block is formed on the connecting column, the connecting column is fixed with the fixing block by a fastening bolt, the inner wall of the fitting plate is arc-shaped, and the fitting plate is fixed on the bearing column by a reinforcing bolt.

[0010] As a further scheme of the application: the anti-settlement mechanism further includes a plurality of groups of connecting assemblies connecting the first connecting sleeve with the second connecting sleeve, strengthening the integrity of the structure and improving the anti-deformation ability.

[0011] As a further scheme of the present application: the connecting assembly comprises a plurality of sets of ball hinge structures arranged on the first connecting sleeve and the second connecting sleeve respectively, connecting structures detachably fixed with the ball hinge structures, and connecting sleeve structures coaxially connecting the two connecting structures, the ball hinge structures allowing the connecting structures to rotate, the plurality of sets of connecting structures are arranged in a circular array on the upper end surface of the first connecting sleeve and the lower end surface of the second connecting sleeve respectively, the connecting structure comprises a first connecting block detachably fixed with the ball hinge structure and a second connecting block connected with the connecting sleeve structure, the second connecting block is provided with a connecting screw rod for fixing the first connecting block, and the second connecting block is provided with a connecting groove connected with the first connecting block; the connecting sleeve structure is movably provided with a protective sleeve for protecting the ball hinge structure, the inner wall of the protective sleeve is attached to the outer wall of the ball hinge structure, the middle part of the protective sleeve is provided as a semi-flexible structure and can be bent, and the lower part of the inner wall of the protective sleeve is provided with a plurality of sets of first limiting strips limiting connected with the ball hinge structure, the outer surface of the ball hinge structure is provided with a plurality of sets of first limiting grooves in a circular array and inserted with the first limiting strips, and the first limiting strips and the first limiting grooves are arranged in alignment.

[0012] As a further scheme of the present application: the connecting sleeve structure comprises first connecting pieces detachably fixed with the connecting structures and second connecting pieces sealingly sleeved with the two first connecting pieces respectively, the end face of the first connecting piece away from the second connecting piece is provided with a lifting groove for the movement of the protective sleeve, the protective sleeve can protect the ball hinge structure and avoid the ball hinge structure being blocked by external impurities; the inside of the second connecting piece is vertically provided with a guide rod extending into the first connecting piece, the first connecting piece is provided with a guide hole attached to the guide rod, the upper and lower ends of the second connecting piece are provided with second connecting grooves for the movement of the first connecting piece, and the inner wall of the second connecting groove is provided with a second limiting strip in a circular array and guiding connected with the first connecting piece, and the outer wall of the first connecting piece is provided with a second limiting groove connected with the second limiting strip.

[0013] As a further scheme of the present application: the connecting assembly further comprises a lifting structure controlling the protective sleeve movably arranged in the first connecting piece and a rotating gear rotatably arranged in the first connecting piece; the connecting assembly further comprises a transmission structure transmissionally connecting the rotating gear and the lifting structure, and a limiting spring sleeved outside the guide rod and connected with the first connecting piece, the guide rod is provided with a rotating groove for the rotation of the rotating gear.

[0014] As a further scheme of the present application: the lifting structure comprises a lifting gear rotatably arranged in the first connecting piece and a lifting rack arranged on the inner wall of the protective sleeve and moving with the lifting gear; the transmission gears are arranged between the lifting gear and the lifting rack, two groups of the transmission gears are symmetrically arranged on the outer side of the lifting gear and engaged with the lifting gear, the transmission gears are engaged with the lifting rack, so that the lifting gear rotates to drive the lifting rack to move through the transmission gears, the rotating gear, the lifting gear and the transmission gear are all provided with rotating blocks connected with the first connecting piece; the transmission structure comprises a first bevel gear structure in transmission connection with the rotating gear and a second bevel gear structure in transmission connection with the lifting gear, the transmission rods are arranged between the first bevel gear structure and the second bevel gear structure, and the first connecting piece is internally provided with support blocks supporting the transmission rods.

[0015] Compared with the prior art, the present application has the following advantages: (1) The pile foundation structure and the anti-settling mechanism are arranged, the pressure plate of the first reinforcing structure is deeply inserted into the bedrock through the multiple rows of anchor bolts, a "inverted wedge type" anchoring is formed, the uplift bearing capacity is greatly improved compared with the prior art, the expansive soil uplift force can be borne, the triangular structure formed by the support members decomposes the horizontal thrust into axial pressure and shear force, the elastic buffer of the elastic pad reduces the local stress concentration of the pile foundation structure and the horizontal displacement, and the present application is suitable for soil bodies with high expansion grade, the second reinforcing structure rigidly connects the second connecting sleeves of adjacent pile foundation structures through the connecting columns to form an integral frame, the load dispersion efficiency is improved, the differential settlement of adjacent pile foundations can be controlled within a small range, the abutting plate of the inclined reinforcing column is abutted with the curved surface of the pile foundation to realize "inclined bracing-frame" composite stress, the shear stiffness is improved, the shear deformation of the expansive soil is effectively resisted, the combination of the elastic pad and the spring washer can compensate the temperature deformation within a certain range, the rigid connection failure caused by thermal expansion and cold contraction is avoided, and the first reinforcing structure and the second reinforcing structure are used in cooperation to improve the horizontal thrust on the high expansive soil body and improve the anti-settling effect of the pile foundation anti-settling structure.

[0016] (2) The first connecting sleeve, the second connecting sleeve and the connecting assembly, the ball hinge structure, the connecting structure, the first connecting piece and the second connecting piece cooperate to fixedly connect the first connecting sleeve and the second connecting sleeve, connect the first reinforcing structure and the second reinforcing structure into one whole, so that the first reinforcing structure and the second reinforcing structure form a collaborative stress system, jointly resist the pushing and pulling force of the soil layer deformation on the pile foundation, the first limiting strip and the second limiting strip can improve the movement stability and the radial bearing capacity of the protective sleeve and the first connecting piece, the guide rod, the lifting structure, the rotary gear, the transmission structure, the limiting spring and the rotary rack are used in cooperation, the protective sleeve and the ball hinge structure are sealingly connected, the ball hinge structure is effectively protected, the service life of the ball hinge structure is prolonged, and the first connecting sleeve and the second connecting sleeve are flexibly connected, so that the connecting assembly is prevented from being broken due to rigid stress, and the service life and the use effect of the connecting assembly are prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure diagram of the present application.

[0018] Figure 2 It is a partial structure diagram of the pile foundation structure and the anti-settling mechanism in the present application.

[0019] Figure 3 It is a partial structure diagram of the first reinforcing structure in the present application.

[0020] Figure 4 It is a partial structure diagram of the second reinforcing structure in the present application.

[0021] Figure 5 It is a partial structure diagram of the first connecting sleeve, the second connecting sleeve and the connecting assembly in the present application.

[0022] Figure 6 It is a partial structure diagram of the connecting assembly in the present application.

[0023] Figure 7 It is a sectional view of the connecting assembly in the present application.

[0024] Figure 8 It is a partial structure of the protective sleeve and the guide rod in the present application.

[0025] Figure 9 It is a partial structure diagram of the lifting structure and the transmission structure in the present application.

[0026] Figure 10 It is a partial structure of the guide rod in the present application.

[0027] In the figure: 1, pile foundation structure; 2, first reinforcing structure; 3, second reinforcing structure; 4, bearing plate; 5, matching block; 6, anchor bolt; 7, support; 8, first connecting sleeve; 9, elastic pad; 10, second connecting sleeve; 11, connecting column; 12, matching plate; 13, reinforcing column; 14, fixed block; 15, spherical hinge structure; 16, connecting structure; 17, connecting sleeve structure; 18, protective sleeve; 19, first connecting piece; 20, second connecting piece; 21, guide rod; 22, lifting structure; 23, rotating gear; 24, transmission structure; 25, limiting spring; 26, lifting gear; 27, lifting rack; 28, transmission gear; 29, first connecting block; 30, second connecting block; 31, first limiting strip; 32, first bevel gear structure; 33, second bevel gear structure; 34, transmission rod; 35, support block; 36, rotating rack; 37, second limiting strip; 38, sealing block. DETAILED DESCRIPTION

[0028] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0029] Embodiment one Please refer to Figure 1 - Figure 4 The present application provides a pile foundation anti-settling structure of a cross-line bridge in an expansive soil area, comprising: a pile foundation structure 1 with a top end supporting a bridge and a bottom end fixed in a bedrock, and an anti-settling mechanism connected with the pile foundation structure 1; the anti-settling mechanism comprises a plurality of groups of first reinforcing structures 2 arranged on both sides of the pile foundation structure 1 and preliminarily reinforcing the pile foundation structure 1, and a plurality of groups of second reinforcing structures 3 arranged on the inner side of the pile foundation structure 1 and further reinforcing the pile foundation structure 1 in cooperation with the first reinforcing structures 2, the top of the pile foundation structure 1 is connected with a bridge through reinforcing blocks, and the bottom end of the pile foundation structure 1 is inserted into the bedrock to resist the vertical displacement of the expansive soil by using the rigidity of the bedrock; wherein the pile foundation structure 1 is composed of a plurality of equally spaced bearing columns, the first reinforcing structures 2 are arranged on both sides of the bearing columns, and the second reinforcing structures 3 are arranged between the two groups of bearing columns.

[0030] In this embodiment, a plurality of groups of first reinforcing structures 2 are installed on both sides of the pile foundation structure 1 and connected with the pile foundation structure 1, and a plurality of groups of second reinforcing structures 3 are installed on the inner side of the pile foundation structure 1 and connected with the pile foundation structure 1, so as to form a pile foundation anti-settling structure of the pile foundation structure 1, the first reinforcing structures 2 and the second reinforcing structures 3.

[0031] In the present invention, the first reinforcement structure 2 includes bearing plates 4 arranged on both sides of the bearing column, fitting blocks 5 connecting the bearing plates 4 to the lower end of the bearing column, and several groups of anchor bolts 6 fixing the bearing plates 4 to the bedrock. The bearing plates 4 are arranged within the expansive soil layer, and the anchor bolts 6 penetrate into the bedrock, forming a "reverse wedge" effect to bear the uplift force of the expansive soil. Several groups of anchor bolts 6 are arranged on the lower end surface of the bearing plates 4, and several groups of anchor bolts 6 are distributed in a rectangular array. The length dimensions of several groups of anchor bolts 6 can also be set to increase successively in the direction away from the bearing column, so as to improve the anchoring effect of the anchor bolts 6. The bearing plates 4, fitting blocks 5, and anchor bolts 6 are used in combination to transfer the horizontal thrust of the expansive soil on the pile foundation structure 1 to the bedrock, reducing the lateral displacement of the pile foundation structure 1.

[0032] In this embodiment, the fitting blocks 5 are installed on the bearing column, and the anchor bolts 6 install the bearing plates 4 on the bedrock.

[0033] In the present invention, the anti-settlement mechanism further includes a support member 7 in an "inverted V" shape fixedly installed on the upper end of the bearing plate 4 and a first connecting sleeve 8 detachably connecting the support member 7 to the bearing column. A triangular stable structure is formed between the support member 7 and the bearing plate 4 to decompose the horizontal load borne by the bearing plate 4 into axial pressure and shear force; an elastic pad 9 fitting the bearing column is provided on the inner wall of the first connecting sleeve 8. The elastic pad 9 is made of chloroprene rubber, allowing a small relative displacement between the bearing column and the first connecting sleeve 8, avoiding stress concentration caused by the extrusion of the expansive soil in rigid connection. Two first connecting sleeves 8 are symmetrically arranged on both sides of the bearing column and fixed by fastening bolts. The first connecting sleeve 8 absorbs the local stress generated by the deformation of the expansive soil, and at the same time forms a rigid constraint through bolt connection to limit the lateral swing of the bearing column.

[0034] In this embodiment, two first connecting sleeves 8 are installed on the bearing column, such that the elastic pad 9 is connected to the outer wall of the first connecting sleeve 8, and the support member 7 transfers the force received by the first connecting sleeve 8 to the bearing plate 4.

[0035] In the present invention, the second reinforcement structure 3 includes a second connecting sleeve 10 arranged above the first connecting sleeve 8 and detachably connecting to the bearing column, and a connecting column 11 fixedly connecting adjacent two second connecting sleeves 10. The second connecting sleeve 10 and the connecting column 11 are both arranged between two bearing columns. Two second connecting sleeves 10 are symmetrically arranged on both sides of the bearing column and fixed by fastening bolts. A strengthening bolt fixed to the bearing column is provided on the second connecting sleeve 10, and one end of the strengthening bolt is installed inside the bearing column. The first connecting sleeve 8 and the second connecting sleeve 10 are both arranged as semi-ring structures. The connecting column 11 and the second connecting sleeve 10 cooperate to evenly transfer the single-pile load to adjacent pile foundation structures 1.

[0036] In this embodiment, two second connecting sleeves 10 are installed on the bearing column, such that the connecting column 11 is connected to the bearing column through the second connecting sleeve 10.

[0037] The anti-settling mechanism further comprises a clamping plate 12 detachably fixed to the receiving column, a reinforcing column 13 supporting and connecting the clamping plate 12 and the connecting column 11, and a fixing block 14 fixed to the lower end of the connecting column 11, the reinforcing column 13 is arranged in an inclined structure, the connecting column 11 is provided with a fixing groove connected with the fixing block 14, the connecting column 11 is fixed to the fixing block 14 by a fastening bolt, the inner wall of the clamping plate 12 is arc-shaped, the clamping plate 12 is fixed to the receiving column by a reinforcing bolt, the clamping plate 12, the reinforcing column 13, the fixing block 14 and the connecting column 11 form a “inclined strut-frame” composite structure, the overall shear capacity is improved, the differential settlement of the pile foundation structure 1 caused by the swelling soil is inhibited, spring washers are arranged at the bolt connection positions, the expansion and contraction deformation of the structure caused by temperature changes is compensated, the overall structure is provided with an anchoring, supporting and frame triple mechanism, the influence of the swelling soil on the pile foundation structure 1 is reduced to a safe range, and the anti-settling mechanism is suitable for areas with medium and above swelling grades.

[0038] In this embodiment, the fixing block 14 is aligned with the connecting column 11, the fixing block 14 is fixed to the connecting column 11, the clamping plate 12 is clamped to the receiving column, and the clamping plate 12 is fixedly connected to the receiving column.

[0039] In actual application, the anti-settling structure has many advantages. First, the anchoring mechanism provides a solid foundation support for the entire pile foundation structure 1 by the anchor bolts 6 penetrating into the bedrock. When the swelling soil produces strong uplift force due to changes in water content, the “inverted wedge” effect formed by the anchor bolts 6 can effectively resist this force, just like driving a firm pile into the ground deep in the foundation, ensuring that the pile foundation structure 1 will not loosen or displace due to uplift.

[0040] The device solves the settlement threat of the swelling soil to the bridge pile foundation through the multi-level design of “anchoring bedrock-triangle support-entire frame”, and is especially suitable for bridge foundation protection of large linear projects such as highways and railways.

[0041] Embodiment two Reference Figure 3 - Figure 10For the second embodiment of the application, the anti-settling mechanism further comprises a plurality of connecting assemblies connecting the first connecting sleeve 8 and the second connecting sleeve 10 and enhancing the overall structure and the anti-deformation capability; the connecting assemblies reduce the risk of independent stress on the components, avoid the situation that the first connecting sleeve 8 and the second connecting sleeve 10 are not directly connected and may be relatively dislocated due to the repeated expansion and contraction of the swelling soil or slight displacement of the pile foundation, resulting in dispersion of the reinforcing force borne by each of them, and the connecting assemblies can rigidly or flexibly connect the two into one whole, so that the first connecting sleeve 8 and the second connecting sleeve 10 form a cooperative stress system to jointly resist the pushing and pulling force of the soil layer deformation on the pile foundation, and the connecting assemblies can transmit the upper load such as the self-weight of the bridge and the vehicle load to the first connecting sleeve 8 through the second connecting sleeve 10, and then disperse it to the bedrock through the bearing plate 4 and the anchor bolt 6, thereby avoiding the situation that the load is concentrated on a connecting sleeve and causes local overload damage, and the application is particularly suitable for scenes with large load fluctuations in swelling soil areas.

[0042] The connecting assembly comprises a plurality of sets of spherical hinge structures 15 arranged on the first connecting sleeve 8 and the second connecting sleeve 10, connecting structures 16 detachably fixedly connected with the spherical hinge structures 15, and connecting sleeve structures 17 coaxially connecting the two connecting structures 16, the spherical hinge structures 15 can rotate the connecting structures 16, the connecting structures 16 are arranged in a circular array on the upper end surface of the first connecting sleeve 8 and the lower end surface of the second connecting sleeve 10, respectively, the connecting structure 16 comprises a first connecting block 29 detachably fixedly connected with the spherical hinge structure 15 and a second connecting block 30 connected with the connecting sleeve structure 17, the second connecting block 30 is provided with a connecting screw rod for fixing the first connecting block 29, and the second connecting block 30 is provided with a connecting groove connected with the first connecting block 29; the connecting sleeve structure 17 is movably provided with a protective sleeve 18 for protecting the spherical hinge structure 15, the inner wall of the protective sleeve 18 is attached to the outer wall of the spherical hinge structure 15, the middle part of the protective sleeve 18 is provided as a semi-flexible structure and can be bent, and the inner wall of the protective sleeve 18 is provided with a plurality of first limiting strips 31 limitingly connected with the spherical hinge structure 15, the outer surface of the spherical hinge structure 15 is provided with a plurality of first limiting grooves in a circular array for inserting the first limiting strips 31, and the first limiting strips 31 are arranged in alignment with the first limiting grooves.

[0043] In this embodiment, the first connecting sleeve 8 and the second connecting sleeve 10 are installed on the pile foundation structure 1, one end of the connecting sleeve structure 17 is fixedly connected with the spherical hinge structure 15 at the upper end of the first connecting sleeve 8 through the connecting structure 16, the first connecting block 29 and the second connecting block 30 are fixedly connected, the connecting sleeve structure 17 is adjusted, the other end of the connecting sleeve structure 17 is fixedly connected with the spherical hinge structure 15 at the lower end of the second connecting sleeve 10 through the first connecting block 29 and the second connecting block 30, and the first limiting strips 31 are installed in the first limiting grooves, so that the protective sleeve 18 is attached to the spherical hinge structure 15.

[0044] The connecting sleeve structure 17 in the application comprises a first connecting piece 19 detachably fixed with the connecting structure 16 and a second connecting piece 20 sealingly sleeved with the two first connecting pieces 19 respectively, a sealing block 38 is arranged between the first connecting piece 19 and the second connecting piece 20, so as to reduce impurities entering the second connecting piece 20, a lifting groove for moving the protective sleeve 18 is arranged on the end face of the first connecting piece 19 away from the second connecting piece 20, the protective sleeve 18 can protect the ball hinge structure 15, so as to avoid the ball hinge structure 15 being blocked by external impurities; a guide rod 21 is vertically arranged in the second connecting piece 20 and extends into the first connecting piece 19, a guide hole is arranged on the first connecting piece 19 and abuts against the guide rod 21, second connecting grooves for moving the first connecting piece 19 are arranged on the upper and lower ends of the second connecting piece 20, and the inner wall of the second connecting groove is circularly arranged with a second limiting strip 37 which is guidingly connected with the first connecting piece 19, and the outer wall of the first connecting piece 19 is provided with a second limiting groove connected with the second limiting strip 37.

[0045] In the embodiment, the second connecting block 30 on the first connecting piece 19 is fixedly connected with the first connecting block 29 on the ball hinge structure 15, when the connecting sleeve structure 17 is adjusted, the first connecting piece 19 moves on the second connecting piece 20, the guide rod 21 moves in the first connecting piece 19, and the second limiting strip 37 moves in the second limiting groove.

[0046] The connecting assembly in the application further comprises a lifting structure 22 movably arranged in the first connecting piece 19 and a rotating gear 23 rotatably arranged in the first connecting piece 19, the connecting assembly further comprises a transmission structure 24 for transmissionally connecting the rotating gear 23 and the lifting structure 22 and a limiting spring 25 sleeved outside the guide rod 21 and connected with the first connecting piece 19, a rotating groove for rotating the rotating gear 23 is arranged on the guide rod 21, and the inner wall of the rotating groove is provided with a rotating rack 36 engaged with the rotating gear 23.

[0047] The lifting structure 22 comprises a lifting gear 26 rotatably arranged in the first connecting piece 19 and a lifting rack 27 arranged on the inner wall of the protective sleeve 18 and moving the protective sleeve 18 by rotating with the lifting gear 26; the transmission gear 28 is arranged between the lifting gear 26 and the lifting rack 27, and two sets of transmission gears 28 are symmetrically arranged on the outer side of the lifting gear 26 and engaged with the lifting gear 26, the transmission gear 28 is engaged with the lifting rack 27, so that the lifting gear 26 rotates to drive the lifting rack 27 to move through the transmission gear 28, the rotating gear 23, the lifting gear 26 and the transmission gear 28 are all provided with rotating blocks connected with the first connecting piece 19; the transmission structure 24 comprises a first bevel gear structure 32 in transmission connection with the rotating gear 23 and a second bevel gear structure 33 in transmission connection with the lifting gear 26, and the transmission rod 34 is arranged between the first bevel gear structure 32 and the second bevel gear structure 33, the inside of the first connecting piece 19 is provided with a plurality of support blocks 35 supporting the transmission rod 34, and the support block 35 can improve the stability of the transmission structure 24 when rotating.

[0048] In the embodiment, when the first connecting piece 19 moves on the second connecting piece 20, the guide rod 21 moves in the first connecting piece 19, the guide rod 21 drives the rotating gear 23 to rotate through the rotating rack 36, the rotating gear 23 drives the first bevel gear structure 32 to rotate, the first bevel gear structure 32 drives the transmission rod 34 to rotate, the transmission rod 34 drives the second bevel gear structure 33 to rotate, the second bevel gear structure 33 drives the lifting gear 26 to rotate, the lifting gear 26 drives the transmission gear 28 to rotate, the transmission gear 28 drives the lifting rack 27 to move, and the lifting rack 27 drives the protective sleeve 18 to move, so that the protective sleeve 18 is connected with the ball hinge structure 15 through the first limiting strip 31, thereby the protective sleeve 18 seals and protects the ball hinge structure 15.

[0049] The above embodiments are only used to illustrate the technical method of the present application, not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical method of the present application.

Claims

1. A settlement prevention structure for pile foundations of overpasses in expansive soil areas, characterized in that, Comprising: A pile foundation structure (1) with the top supporting the bridge and the bottom fixed in the bedrock, and a settlement prevention mechanism connected to the pile foundation structure (1); The settlement prevention mechanism includes several groups of first reinforcement structures (2) arranged on both sides of the pile foundation structure (1) for preliminary reinforcement of the pile foundation structure (1), and a second reinforcement structure (3) arranged inside the pile foundation structure (1) and cooperating with the first reinforcement structure (2) for further reinforcement; Among them, the pile foundation structure (1) consists of multiple receiving columns distributed at equal intervals.

2. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 1, characterized in that, The first reinforcement structure (2) includes bearing plates (4) arranged on both sides of the receiving column, fitting blocks (5) connecting the bearing plates (4) to the lower end of the receiving column, and several groups of anchor bolts (6) fixing the bearing plates (4) to the bedrock.

3. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 2, characterized in that, The settlement prevention mechanism further includes a support member (7) in a "V" shape fixed to the upper end of the bearing plate (4), and a first connecting sleeve (8) detachably connecting the support member (7) to the receiving column; The inner wall of the first connecting sleeve (8) is provided with an elastic pad (9) fitting the receiving column.

4. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 3, characterized in that, The second reinforcement structure (3) includes a second connecting sleeve (10) arranged on the upper side of the first connecting sleeve (8) and detachably connecting to the receiving column, and a connecting column (11) fixedly connecting adjacent two second connecting sleeves (10).

5. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 4, characterized in that, The settlement prevention mechanism further includes a fitting plate (12) detachably fixed to the receiving column, a strengthening column (13) supporting and connecting the fitting plate (12) to the connecting column (11), and a fixing block (14) fixing the strengthening column (13) to the lower end of the connecting column (11).

6. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 4, characterized in that, The settlement prevention mechanism further includes several groups of connecting components connecting the first connecting sleeve (8) and the second connecting sleeve (10) to strengthen the structural integrity and improve the anti-deformation ability.

7. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 6, characterized in that, The connecting components include several groups of ball joint structures (15) respectively arranged on the first connecting sleeve (8) and the second connecting sleeve (10), a connecting structure (16) detachably and fixedly connected to the ball joint structure (15), and a connecting sleeve structure (17) coaxially connecting the two connecting structures (16); A protective sleeve (18) for protecting the ball joint structure (15) is movably arranged on the connecting sleeve structure (17).

8. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 6, characterized in that, The connecting sleeve structure (17) includes a first connecting member (19) detachably and fixedly connected to the connecting structure (16), and second connecting members (20) hermetically sleeved with the two first connecting members (19) respectively; A guide rod (21) extending into the first connecting member (19) is vertically arranged inside the second connecting member (20).

9. The anti-settlement structure for pile foundations of overpasses in expansive soil areas according to claim 8, characterized in that, The connecting components further include a lifting structure (22) for controlling the protective sleeve (18) to be movably arranged in the first connecting member (19), and a rotating gear (23) rotatably arranged in the first connecting member (19); The connecting components further include a transmission structure (24) transmittingly connecting the rotating gear (23) and the lifting structure (22), and a limiting spring (25) sleeved outside the guide rod (21) and connected to the first connecting member (19).

10. A settlement prevention structure for overpass pile foundations in expansive soil areas according to claim 9, characterized in that, The lifting structure (22) includes a lifting gear (26) rotatably disposed in the first connector (19) and a lifting rack (27) disposed on the inner wall of the protective sleeve (18) and controlling the movement of the protective sleeve (18) as the lifting gear (26) rotates. A transmission gear (28) is provided between the lifting gear (26) and the lifting rack (27).

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