Deviation rectifying and load holding conversion device of existing pile foundation building

Abstract

The utility model discloses a rectification load-holding conversion device of an existing pile foundation building in the technical field of building rectification, which comprises a supporting pipe, an elastic top piece, a filling fixing piece and a top supporting cover, a foundation pile of a building needing rectification is cut off, the load-holding conversion device is arranged at the position of the cut-off part of the foundation pile, and in the process of cutting off the foundation pile, the load-holding conversion device is connected with the elastic top piece. The force underpinning of the foundation pile to be rectified is synchronously completed, after rectification is completed, the force of the lifting support is converted to the device by means of the load holding conversion device, then the lifting support can be removed, foundation pile repairing construction is immediately carried out, the whole rectification process is carried out below a foundation plane, no damage is caused to an upper structure, no extra underpinning structure needs to be arranged, and the cost is reduced. The steps of design calculation and setting of the underpinning structure are omitted, and the cost and time for dismantling the underpinning structure and repairing the upper structure are saved; the arrangement and underpinning of the load holding conversion device are carried out synchronously, and the repair construction of the foundation pile can be carried out immediately after the lifting support is removed, so that the device is time-saving, labor-saving, simple and efficient.

Description

TECHNICAL FIELD

[0001] The utility model relates to building rectification technical field, especially a kind of rectification load conversion device of pile foundation building. BACKGROUND

[0002] With the gradual increase of construction land development intensity, more and more buildings are constructed on fill slope, and the soil of fill slope often has large post-construction settlement. The settlement of soil will adversely affect the pile foundation, accelerate the settlement of the building and even cause the building to tilt. The tilted building needs to be rectified in time, otherwise the tilt will be further intensified, affecting the normal play of building function and safe use.

[0003] For the tilted building, the common rectification methods mainly include jacking and forced lowering.

[0004] The conventional operation of jacking method is to disconnect the selected rectification part above the pile foundation of the building. The rectification part is usually located at the first floor building column or wall, and the non-load-bearing wall and stairs of the building in the same height range need to be disconnected. A closed continuous lifting support structure is newly set in the plane, and the lifting support is used for jacking rectification. After rectification, the newly added support structure needs to be removed. The whole rectification process has large damage to the existing building, high repair cost, complicated operation, and lacks lateral constraint, so the lateral stability during rectification is poor.

[0005] The forced lowering method is generally suitable for shallow foundation. The foundation on the side with small settlement is forced to lower to achieve rectification, without damaging the building interior. However, the rectification accuracy is low, and the construction speed is slow.

[0006] The existing pile foundation unloading method for forced lowering rectification needs to additionally set a support bracket and the like at the position below the pile cap, and cut off the pile foundation below the pile cap. The design needs to design the support system formed by the bracket, lifting support and pile below the part to be cut off. The bending capacity of the normal section of the support structure system, the local compression bearing capacity and the shear capacity of the inclined section are calculated. After rectification, the cut-off part is secondarily poured and formed. The whole process has complex design scheme calculation, large construction difficulty, high cost, lacks lateral constraint, and has poor lateral stability during rectification, small construction space and large working difficulty. Once the support structure deviates, the construction progress will be delayed, and the building settlement and the bearing capacity of each pile foundation will be affected.

[0007] Based on this, the utility model designs a rectification load conversion device for pile foundation building to solve the above problems. UTILITY MODEL CONTENTS

[0008] The purpose of this invention is to provide a load-bearing conversion device for correcting tilting in existing pile foundation structures. This device simultaneously completes the force transfer for tilt correction during the pile cutting process. After correction, the force from the lifting support is transferred to this device using a unique load-bearing conversion device. The lifting support can then be removed, and pile repair can be carried out immediately. The entire tilt correction process is performed below the foundation surface, causing no damage to the superstructure. Furthermore, it eliminates the need for additional support structures, saving the steps of designing, calculating, and setting up support structures, as well as the cost and time of dismantling support structures and repairing the superstructure. The load-bearing conversion device is a prefabricated component, allowing for simultaneous design and support conversion. Pile repair can be carried out immediately after the lifting support is removed, saving time, effort, and is simple and efficient.

[0009] This utility model is implemented as follows: a tilt-correcting and load-bearing conversion device for existing pile foundation structures, comprising:

[0010] Support tube, elastic top plate, filler fastener and top cover;

[0011] The support tube is a straight tube with openings at both ends. A bottom sealing plate is sealed on the bottom opening of the support tube, and an upper sealing plate is also provided in the inner cavity of the support tube. The upper sealing plate blocks the cross-section of the inner cavity of the support tube.

[0012] Multiple pile foundation steel bars are vertically installed on the outer wall of the support pipe.

[0013] The filling material is concrete, and the cavity between the upper sealing plate and the bottom sealing plate inside the support pipe is filled with the filling material.

[0014] The filling material is cast into shape inside the support tube;

[0015] The elastic top piece is a spring piece, which is placed inside the support tube and is located at the top of the upper sealing plate;

[0016] The top support cover is a cover plate. The top support cover elastically covers the top opening of the support tube and presses on the top of the elastic top piece. The top support cover and the upper sealing plate form a cavity. Multiple elastic top pieces are elastically squeezed into the cavity between the top support cover and the upper sealing plate.

[0017] The inner wall of the support pipe is also provided with a grouting pipe and an exhaust pipe, both of which are connected to the cavity formed by the top support cover and the upper sealing plate.

[0018] Furthermore, the elastic top piece is a disc spring, and multiple elastic top pieces are stacked one on top of the upper sealing plate in sequence.

[0019] Furthermore, the bottom of the top support cover is also provided with multiple connecting rods, which connect the top support cover and the upper sealing plate;

[0020] The connecting rod is a bent steel wire.

[0021] Furthermore, the filling component is micro-expansion concrete; the support pipe is a steel pipe.

[0022] Furthermore, both the grouting pipe and the venting pipe are installed on the side wall of the support pipe, with the grouting pipe located below the venting pipe;

[0023] The grouting pipe is located below the upper sealing plate; the venting pipe is located above the upper sealing plate.

[0024] The beneficial effects of this utility model are: 1. The overall structure of this utility model, as a complete supporting structure, can be directly installed inside the cut-off pile foundation and replace the length of the cut-off pile foundation with a shorter support pipe to form a shorter supporting structure, thereby achieving the purpose of settling the building. The construction is very convenient and does not require the use of other supporting structures. The construction of this device does not damage the upper building and structure, has high construction feasibility and stability, high tilt correction accuracy, fast speed, and strong tilt correction ability.

[0025] 2. During the construction of this device, the support pipe is cast inside the pile foundation. The steel reinforcement on the outside of the pipe and the subsequent concrete form an effective bond, forming a stable load. At the same time, the load-bearing device forms a steel-concrete composite component, increasing the compressive bearing capacity of the pile section and making the structure more reliable.

[0026] 3. The support height of this device can be adjusted on site. It is only necessary to adjust the length of the top of the support pipe and add different numbers of elastic top plates. It is easy to use and flexible on site. After the elastic top plate space inside the upper sealing plate is corrected, concrete is poured. After the concrete is poured, it is more solid and stable. The support effect is better than the original pile foundation. It provides more stable support for the cut-off pile foundation and does not affect the building strength. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] Figure 1 This is a schematic diagram of the overall internal structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the external structure of the support tube of this utility model;

[0030] Figure 3 This is a schematic diagram of the structure of the foundation pile in a partially truncated state according to this utility model;

[0031] Figure 4 This is a schematic diagram of the structure for partially installing jacks at the cut-off point of the foundation pile in this utility model;

[0032] Figure 5A top view of the structure with a jack installed at the cut-off point of the foundation pile of this utility model;

[0033] Figure 6 A top view of the structure with jacks installed at the symmetrical cut-off points of the foundation pile of this utility model;

[0034] Figure 7 A schematic diagram of the front structure of the foundation pile with jacks installed at the symmetrical cut-off point;

[0035] Figure 8 This is a schematic diagram of the support pipe structure for the complete severance of the foundation pile and the installation of the load-bearing conversion device.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 1-Support pipe, 11-Upper sealing plate, 12-Bottom sealing plate, 13-Pile foundation reinforcement, 2-Elastic top plate, 21-Connecting rod, 22-Top support cover, 3-Filling fastener, 31-Grouting pipe, 32-Exhaust pipe, 4-Jack, 41-Foundation pile, 42-Pile cap, 5-Restraint stirrup. Detailed Implementation

[0038] Please see Figures 1 to 8 As shown, this utility model provides a tilting and load-bearing conversion device for existing pile foundation buildings. In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In a specific embodiment of the technical solution of this utility model:

[0040] Includes support tube 1, elastic top plate 2, filling fastener 3, and top cover 22;

[0041] The support pipe 1 is a straight pipe with openings at both ends. A bottom sealing plate 12 is sealed at the bottom opening of the support pipe 1. The bottom sealing plate 12 is erected on the truncated pile foundation to support the pile foundation. An upper sealing plate 11 is also installed in the inner cavity of the support pipe 1. The upper sealing plate 11 is blocked at the cross-section of the inner cavity of the support pipe 1. The upper sealing plate 11 is supported on the upper cross-section of the pile foundation to support the upper structure of the pile foundation, thereby forming a complete load-bearing structure to replace the original device. It can be adjusted and designed according to the actual height requirements. The support pipe 1 can be cut according to the requirements, and the height of the filling fastener 3 changes with the length of the support pipe 3. The bottom sealing plate 12 is used to strengthen the strength of the filling fastener 3 and prevent it from being crushed. It is restricted by the support pipe 1.

[0042] Multiple pile foundation steel bars 13 are vertically installed on the outer wall of the support pipe 1. The pile foundation steel bars 13 are the steel bars cut off from the pile foundation and re-welded into a whole steel bar. When the settlement occurs, the pile foundation steel bars are too long and need to be cut off and then welded into a whole. The pile foundation steel bars 13 of this device need to be attached to the outside of the support pipe 1. The pile foundation steel bars 13 and the support pipe 1 can be welded into a whole to bear the force.

[0043] The filling component 3 is concrete, and the cavity between the upper sealing plate 11 and the bottom sealing plate 12 inside the support pipe 1 is filled with the filling component 3.

[0044] The filler 3 is cast into the support tube 1;

[0045] The elastic top piece 2 is a spring piece, which is placed inside the support tube 1 and is located at the top of the upper sealing plate 11.

[0046] The top support cover 22 is a cover plate. The top support cover 22 elastically covers the top opening of the support tube 1, and the top support cover 22 presses on the top of the elastic top piece 2. The top support cover 22 and the upper sealing plate 11 form a cavity, and multiple elastic top pieces 2 are elastically squeezed in the cavity between the top support cover 22 and the upper sealing plate 11.

[0047] The inner wall of the support pipe 1 is also provided with a grouting pipe 31 and an exhaust pipe 32, both of which are connected to the cavity formed by the top support cover 22 and the upper sealing plate 11.

[0048] Both the grouting pipe 31 and the venting pipe 32 are installed on the side wall of the support pipe 1, with the grouting pipe 31 located below the venting pipe 32. Both the grouting pipe 31 and the venting pipe 32 are PVC pipes, which facilitate subsequent extraction and concrete pouring.

[0049] The filling component 3 is micro-expansion concrete; the elastic top plate 2 is a disc spring, and multiple elastic top plates 2 are stacked one on top of the upper sealing plate 11. The support pipe 1 is a steel pipe. The grouting pipe 31 is located below the upper sealing plate 11; the venting pipe 32 is located above the upper sealing plate 11. Multiple connecting rods 21 are also provided at the bottom of the top support cover 22. The connecting rods 21 are connected between the top support cover 22 and the upper sealing plate 11. The connecting rods 21 can be flexible and bend to form a certain tension, thereby filling the cavity in the top support cover 22 and the upper sealing plate 11 with concrete. After the concrete solidifies, the connecting rods 21 form a pre-tightening force in the concrete.

[0050] The connecting rod 21 is a bent steel wire.

[0051] Grouting is performed inside the hollow support pipe 1 through the grouting pipe 31, injecting micro-expansion concrete into the cavity between the upper sealing plate 11 and the top support cover 22. This allows the internal elastic top plate 2 and connecting rod 21 to be cast together inside the entire support pipe 1, thereby reinforcing the entire support pipe 1 and forming an integral concrete structure. It also has the pre-tightening force formed by the elastic top plate 2 and connecting rod 21. At the same time, the steel support pipe 1 is added for reinforcement, making the entire structure more robust and significantly stronger than the original pile foundation.

[0052] It should be noted that:

[0053] 1. Existing forced landing methods for correcting the deviation of pile foundations require the installation of a replacement structure first, followed by the cutting off of the pile foundation. The replacement structure needs to be constructed in the underground pile foundation section, which is difficult to operate and takes a long time. This device can unload and replace simultaneously. The entire device can be directly installed in the middle of the cut-off section of the cut concrete pile foundation. Moreover, it can replace while cutting, making the operation more stable.

[0054] 2. Currently existing underpinning structures are basically concrete or steel structures, which increases the amount of reinforcing steel or steel used. They also need to be cast integrally with the original pile foundation, and the original pile foundation is cut off after the underpinning structure reaches the required strength. During the correction process, there is no horizontal constraint, and the lifting supports can only be removed and the underpinning structure dismantled after the original structure is repaired, which is time-consuming and labor-intensive. This device, before concrete is poured, serves as a load-bearing transfer mechanism. The support pipe 1, elastic top plate 2, and top support cover 22 already provide support for the upper building. Before filling the internal cavity, the lifting supports can be adjusted until the building's tilt meets the requirements. Then, concrete is poured into the internal cavity of the upper sealing plate 11 and the top support cover 22 to further strengthen the structure, simplifying construction. After the internal concrete solidifies, the lifting supports are removed, and all cut piles are cast. Underpinning and pile splicing are carried out simultaneously, and the building load is slowly and orderly transferred to this device, making the entire construction process more stable.

[0055] During construction, this utility model is implemented through the following steps:

[0056] Before construction, a horizontal restraint device needs to be installed on the side of the foundation pile 41. The horizontal restraint device includes anchor cables and anti-deviation jacking. The anchor cables are tightened and anchored between the building pile foundation and the concrete support by corbels. The anti-deviation jacking can be made by using hydraulic jacks to make it horizontally jacked between the pile cap 42 and the foundation pit.

[0057] The building is supported and pulled on the outside, which applies a force to the building in the opposite direction of tilt. The pile 41 can also be pulled by anchor cables in the direction where there is no tilt to keep it horizontal and stable and prevent it from tilting during construction. The force is released continuously during subsequent construction to cooperate with the settlement of the pile 41.

[0058] Step S1: For the pile 41 that needs to be cut off, the restraining stirrups 5 are wrapped around the upper and lower ends of the cut-off point, and the restraining stirrups 5 are bonded to the outer layer of concrete of the pile 41 with epoxy resin to keep the pile 41 that needs to be cut off as stable as possible.

[0059] Step S2: Remove a portion of the concrete from the cross-section of the pile 41 and cut off the longitudinal reinforcement of the pile 41 after the concrete has been removed. Then grind the cut-off section of the pile 41 to make it smooth and level. Immediately place the lifting support in the cut-off section and adjust the lifting support 4 to support the upper and lower sides of the cut-off section of the pile 41.

[0060] Step S3, following the method described in Step 2, involves constructing the foundation piles 41 in a symmetrically cut-off sequence, as follows: Figure 6 As shown, the foundation pile 41 is cut off, and the cut-off point is supported by the lifting support 4 until the entire foundation pile 41 is completely cut off and stably supported by multiple lifting supports 4. A gap is left on one side without the lifting support 4 being inserted. This gap is used to install a load-bearing conversion device into the foundation pile 41. After the load-bearing conversion device is inserted, a lifting support 4 is also inserted into the gap to ensure that the cut-off foundation pile 4 is evenly supported by multiple lifting supports around it.

[0061] Step S4: Based on the settlement height and building tilt angle, obtain the required settlement height of each pile 41, and make a load-bearing conversion device corresponding to the support height and correction amount. Place the height-matched load-bearing conversion devices one by one into the completely cut-off pile 41, so that the load-bearing conversion device is located at the center of the cut-off pile 41.

[0062] Step S5: By measuring the number of overlapping elastic top plates 2 inside the support pipe 1, the support height of the top support cover 22 is adjusted, and the support height of the lifting support 4 is adjusted so that the upper end face of the cut-off pile 41 slowly descends, so that the distance between the top support cover 22 and the bottom sealing plate 12 after bearing pressure reaches the support height required after the building is corrected. Then, the lifting support 4 is shortened further, so that the support force of the lifting support 4 is slowly alternately transferred to the load-bearing conversion device. According to the tilt of the pile foundation building, the building is forced to fall and corrected by adjusting the return stroke of the lifting support 4, and the load-bearing conversion device is tightened until the load-bearing conversion device supports the cut-off pile 41. At the same time, the pulling length of the horizontal constraint device is released to provide settlement space for the lifting support 4.

[0063] Step S6: Grout the cavity inside the support pipe 1 through the grouting pipe 31 until the grout flows out from the vent pipe 32, stop grouting and wait for the grout inside the support pipe 1 to solidify and harden; after grouting is completed, the grouting pipe 31 and the vent pipe 32 need to be cut off to keep the support pipe 1 intact.

[0064] Step S7: The upper and lower cut-off pile foundation steel bars 13 are welded together completely, and reinforcing steel bars are also welded to the outside of the support pipe 1.

[0065] Step S8: Remove the lifting support 4 in sequence, pour micro-expansion concrete on the outside of the foundation pile 41 cut off by the load conversion device, and wait for the concrete at the cut-off point to solidify and form. The diameter of the concrete poured at the cut-off point of the foundation pile 41 is equal to the diameter of the normal foundation pile 41.

[0066] In step S9, each cut-off pile 41 must be fitted with a height-matched load-bearing conversion device according to steps 5-7. Then, the site is backfilled to the original outdoor elevation, and the horizontal constraint lifting support is removed to complete the building correction operation.

[0067] The foundation pile 41 at the cut-off point and the pile cap 42 maintain stable support. This device needs to be supported under the pile cap 41, that is, the part of this device located below the pile cap 42 needs to be corrected.

[0068] When the diameter of the foundation pile 41 is small and the space only allows for the placement of three lifting supports, the foundation pile 41 can be cut off in sequence and the load-bearing conversion device can be installed.

[0069] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for rectifying inclination and converting load of a building with an existing pile foundation, characterized in that, The utility model relates to a support pipe (1), elastic top sheet (2), filling solid (3) and top support cover (22) are included: Support pipe (1) is the straight pipe of both ends opening, the bottom opening of support pipe (1) is closed bottom sealing plate (12), the upper sealing plate (11) is still arranged in the cavity of support pipe (1), and the upper sealing plate (11) blocks in the cavity section of support pipe (1); The outer wall of support pipe (1) is vertically provided with a plurality of pile steel bars (13); Filling solid (3) is concrete, and the cavity between the upper sealing plate (11) and the bottom sealing plate (12) in support pipe (1) is filled with filling solid (3); Filling solid (3) is cast in place in support pipe (1); The elastic top sheet (2) is a spring sheet, the elastic top sheet (2) is arranged in the support pipe (1), and the elastic top sheet (2) is on the top of the upper sealing plate (11); The top support cover (22) is a cover plate, the top support cover (22) is elastically covered at the top opening of the support pipe (1), and the top support cover (22) is pressed on the top of the elastic top sheet (2), the top support cover (22) and the upper sealing plate (11) form a cavity, and a plurality of elastic top sheets (2) are elastically extruded in the cavity of the top support cover (22) and the upper sealing plate (11); The inner wall of support pipe (1) is further provided with a grouting pipe (31) and an exhaust pipe (32), and the grouting pipe (31) and the exhaust pipe (32) are communicated with the cavity formed by the top support cover (22) and the upper sealing plate (11). The elastic top sheet (2) is a disc spring, and a plurality of elastic top sheets (2) are arranged on the top of the upper sealing plate (11) in sequence.

2. A device for rectifying inclination and converting load of a building with an existing pile foundation according to claim 1, characterized in that: The bottom of the top support cover (22) is further provided with a plurality of connecting rods (21), and the connecting rods (21) are connected between the top support cover (22) and the upper sealing plate (11); 3. A device for rectifying inclination and converting load of a building with existing pile foundation according to claim 1, characterized in that: The connecting rod (21) is a curved steel wire. The filling solid (3) is micro-expansion concrete, and the support pipe (1) is a steel pipe.

4. A device for rectifying inclination and converting load of a building with an existing pile foundation according to claim 1, characterized in that: The grouting pipe (31) and the exhaust pipe (32) are arranged on the side wall of the support pipe (1), and the grouting pipe (31) is below the exhaust pipe (32); 5. A device for rectifying inclination and converting load of a building with existing pile foundation according to claim 1, characterized in that: The grouting pipe (31) is below the upper sealing plate (11), and the exhaust pipe (32) is above the upper sealing plate (11). ​

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