Existing building lifting and supporting structure and construction method

Abstract

The invention provides an existing building lifting and supporting structure and a construction method, and belongs to the technical field of tunnel engineering. The existing building lifting and supporting structure comprises a reinforcing foundation, a plurality of hole piles, a plurality of bearing pieces and a plurality of jacking devices; the reinforcing foundation is arranged below the existing building, and a mounting groove and an avoiding groove are formed in the reinforcing foundation; the multiple hole piles are installed on the two reinforcing foundations correspondingly. The upper end of the hole pile is connected with the reinforcing foundation; the bearing pieces are installed in the two sets of installation grooves correspondingly and fixedly connected with the corresponding hole piles. A protruding part is arranged on one side of the bearing piece. An operation distance is formed between the upper end of the protruding part and the lower end face of the existing building; the jacking device is installed in the operation space, the lower end of the jacking device is supported on the protruding part, and the upper end of the jacking device acts on the lower end face of the existing building. According to the existing building object lifting and supporting structure, the existing building object is effectively and firmly supported by means of the reinforcing foundation, the hole piles, the bearing pieces and the jacking devices.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel engineering, and more specifically, relates to a lifting support structure for an existing structure and a construction method. Background Art

[0002] With the rapid development of urban tunnel engineering construction in my country, it is inevitable that dark excavation or shield tunnels pass through existing structures. Due to the heavy weight of existing structures and the short crossing distance, if the structures are not properly protected, safety and quality problems such as large settlement or cracking are very likely to occur. In serious cases, the normal use of existing structures will be affected.

[0003] At present, the traditional way to protect existing structures is to reinforce the bottom of the structure by deep hole grouting. This process can often play a certain role when the tunnel passes through the existing structure with a large clearance and good stratum structure. However, it is not applicable to the case of ultra-small clearance and relatively weak stratum, so it is impossible to effectively and firmly support and protect the existing structure. Summary of the invention

[0004] The purpose of the present invention is to provide a lifting support structure and a construction method for an existing structure, so as to solve the technical problem existing in the prior art that the existing structure cannot be effectively and firmly supported and protected.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a lifting support structure for an existing structure, comprising:

[0006] A reinforcement foundation is used to be arranged below the existing structure; the reinforcement foundation is provided with two sets of installation grooves respectively located on both sides of the existing structure, and the inner walls of the installation grooves are provided with avoidance grooves extending toward the existing structure, and the avoidance grooves correspond to the upper and lower parts of the existing structure;

[0007] There are multiple hole piles, which are respectively installed on the two reinforcement foundations; the hole piles are arranged vertically and correspond to the installation grooves; the upper ends of the hole piles are connected to the reinforcement foundation, and the lower ends extend downward in a direction away from the reinforcement foundation;

[0008] A plurality of supporting members are respectively installed in the two groups of the installation grooves and fixedly connected to the corresponding hole piles; a protrusion installed in the avoidance groove is provided on one side of the supporting member; an operating distance is provided between the upper end of the protrusion and the lower end surface of the existing structure;

[0009] There are multiple lifters, which correspond one to one with the multiple supporting members; the lifters are installed in the operating interval, and the lower end of the lifters is supported on the protruding part, and the upper end acts on the lower end surface of the existing structure.

[0010] In a possible implementation, the upper end surface of the reinforcement foundation and the lower end surface of the existing structure are located on the same plane, and the upper end surface of the supporting member is higher than the upper end surface of the reinforcement foundation and the lower end surface of the existing structure.

[0011] In a possible implementation manner, the protruding portion and the supporting member are integrally formed, and the protruding portion and the supporting member are arranged in an L shape.

[0012] In a possible implementation manner, a pre-embedded steel plate is provided on the protruding portion.

[0013] In a possible implementation, the jack includes a plurality of jacks evenly mounted on the protrusions, and the lower ends of the jacks are fixedly connected to the steel plate.

[0014] In a possible implementation, a plurality of the installation grooves in the same group are arranged at intervals along the length direction of the existing structure.

[0015] In a possible implementation, a steel casing is provided on the outer side of the bored pile.

[0016] The beneficial effect of the existing structure lifting support structure provided by the present invention is that: compared with the prior art, the existing structure lifting support structure of the present invention, when a new structure is set under the existing structure, grouting reinforcement is carried out in advance under the existing structure through a deep hole grouting process to form a reinforced foundation, and the grouting process needs to control the slurry ratio and grouting pressure to ensure that the reinforced foundation has good quality; then symmetrically arranged bored piles are respectively applied on both sides of the existing structure, and the bored piles extend downward to a deeper position after passing through the reinforced foundation; specifically, the bored piles are formed by rotary drilling and grouting; the bored piles need to select suitable pile diameters, spacings and depths to have a certain bearing capacity; and multiple bored piles are arranged on both sides of the existing structure to improve the stability of the entire reinforced foundation. Then, a vertical shaft is constructed from the position corresponding to the bored pile on the ground, the lower end of the vertical shaft is connected with the upper end surface of the reinforced foundation, a mounting groove is processed on the reinforced foundation, and an avoidance groove is processed on the inner wall of the mounting groove; the supporting member is installed in the mounting groove, the protruding part is installed in the avoidance groove, and the lower end of the supporting member is fixedly connected with the bored pile; finally, a jacking device is installed at the operating interval, and the jacking device is started, and the jacking device generates an upward force and applies it to the existing structure, so that the existing structure is effectively and firmly supported.

[0017] Another object of the present invention is to provide a method for lifting an existing structure, comprising any one of the above-mentioned existing structure lifting support structures, and further comprising:

[0018] S1: adjusting the slurry ratio and the grouting pressure, and performing grouting operations in the area below the bottom of the existing structure to reinforce the foundation;

[0019] S2: drilling holes on both sides of the existing structure and grouting to form the bored piles, wherein the bored piles penetrate the reinforced foundation; a plurality of the bored piles are arranged on both sides of the existing structure, and the plurality of the bored piles are arranged along the length direction of the existing structure;

[0020] S3: constructing a vertical shaft above the pile, processing the installation groove at the position corresponding to the reinforced foundation and the vertical shaft, and processing the avoidance groove on the inner wall of the installation groove; installing the supporting member in the installation groove and fixedly connecting it to the pile, and installing the protruding part into the avoidance groove;

[0021] S4: Install a jacking device at the operating distance above the protruding portion, wherein the lower end of the jacking device is fixedly connected to the protruding portion, and the upper end is connected to the bottom of the existing structure; start the jacking device, and the jacking device generates an upward force and applies it to the existing structure.

[0022] In a possible implementation, before installing the supporting member in the installation groove in step S3, a steel plate is embedded in the protruding portion; and in step S4, the lower end of the lifter is fixedly installed on the steel plate.

[0023] In a possible implementation, the upper end surface of the hole pile is higher than the bottom surface of the installation groove, and the lower end of the supporting member is fixedly connected to the upper end of the hole pile by docking.

[0024] The method for lifting the existing structure provided by the present invention adopts the support structure for lifting the existing structure, that is, when working, a reinforced foundation is first formed under the existing structure, and symmetrically arranged piles are respectively constructed on both sides of the existing structure, and the piles are processed by rotary drilling and grouting; the piles need to have a suitable pile diameter, spacing and depth to have a certain bearing capacity. Then, a vertical shaft is constructed from the position corresponding to the piles on the ground, and an installation groove and an avoidance groove are processed on the reinforced foundation; and the supporting member is installed in the installation groove, and the protruding part is installed in the avoidance groove. Finally, a jack is installed at the operating spacing, and the jack is started. The jack generates an upward force and applies it to the existing structure, so that the existing structure is effectively and firmly supported. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] Figure 1 A top view of the existing structure lifting support structure provided by an embodiment of the present invention in an existing structure and a newly constructed structure;

[0027] Figure 2 A cross-sectional view of an existing structure lifting support structure provided by an embodiment of the present invention in an existing structure and a newly constructed structure.

[0028] Among them, the reference numerals in the figure are:

[0029] 100. Strengthen foundation; 110. Installation groove; 120. Avoidance groove; 200. Hole pile; 300. Support member; 310. Protrusion; 320. Operating spacing; 330. Steel plate; 400. Jacking device; 500. Vertical shaft; 600. Existing structure; 700. New structure. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] See also Figure 1 and Figure 2 , the lifting support structure of the existing structure 600 provided by the present invention is now described. A lifting support structure for an existing structure 600 includes a reinforcement foundation 100, bored piles 200, a supporting member 300 and a jacking device 400; the reinforcement foundation 100 is used to be arranged below the existing structure 600; two groups of installation grooves 110 are opened on the reinforcement foundation 100 and are respectively located on both sides of the existing structure 600, and the inner walls of the installation grooves 110 are provided with avoidance grooves 120 extending toward the existing structure 600, and the avoidance grooves 120 correspond to the upper and lower parts of the existing structure 600; there are multiple bored piles 200, which are respectively installed on two reinforcement foundations 100; the bored piles 200 are arranged vertically and correspond to the installation grooves 110; the bored piles 200 The upper end is connected to the reinforced foundation 100, and the lower end extends downward in a direction away from the reinforced foundation 100; there are multiple supporting members 300, which are respectively installed in two groups of installation grooves 110 and fixedly connected to the corresponding hole piles 200; one side of the supporting member 300 is provided with a protrusion 310 installed in the avoidance groove 120; an operating interval 320 is provided between the upper end of the protrusion 310 and the lower end surface of the existing structure 600; there are multiple jacking devices 400, which correspond one to one to multiple supporting members 300; the jacking devices 400 are installed in the operating interval 320, and the lower end of the jacking device 400 is supported on the protrusion 310, and the upper end acts on the lower end surface of the existing structure.

[0035] Compared with the prior art, the lifting support structure of the existing structure 600 provided by the present invention is that when a new structure 700 is set under the existing structure 600, grouting reinforcement is performed in advance under the existing structure 600 through a deep hole grouting process to form a reinforced foundation 100, and the grouting process needs to control the slurry ratio and grouting pressure to ensure that the reinforced foundation 100 has good quality; then, symmetrically arranged bored piles 200 are respectively applied on both sides of the existing structure 600, and the bored piles 200 extend downward to a deeper position after passing through the reinforced foundation 100; specifically, the bored piles 200 are formed by rotary drilling and grouting; the bored piles 200 need to select suitable pile diameters, spacings and depths to have a certain bearing capacity; and multiple bored piles 200 are arranged on both sides of the existing structure 600 to improve the stability of the entire reinforced foundation 100. Then, a vertical shaft 500 is constructed from the position corresponding to the bored pile 200 on the ground, the lower end of the vertical shaft 500 is connected to the upper end surface of the reinforced foundation 100, the installation groove 110 is processed on the reinforced foundation 100, and the avoidance groove 120 is processed on the inner wall of the installation groove 110; the supporting member 300 is installed in the installation groove 110, the protrusion 310 is installed in the avoidance groove 120, and the lower end of the supporting member 300 is fixedly connected to the bored pile 200; finally, the jacking device 400 is installed at the operating interval 320, and the jacking device 400 is started, and the jacking device 400 generates an upward force and applies it to the existing structure 600, so that the existing structure 600 is effectively and firmly supported.

[0036] See also Figure 2 As a specific embodiment of the lifting support structure of the existing structure 600 provided by the present invention, the upper end surface of the reinforcement foundation 100 and the lower end surface of the existing structure 600 are located on the same plane, and the upper end surface of the supporting member 300 is higher than the upper end surface of the reinforcement foundation 100 and the lower end surface of the existing structure 600; so that the reinforcement foundation 100 itself can have a certain bearing effect on the existing structure 600, thereby improving the stability of the existing structure 600. At the same time, the upper end of the supporting member 300 is set higher than the lower end surface of the existing structure 600, so that the supporting member 300 itself is limited in the left and right directions, so that it is more reliable and stable to use. The supporting member 300 is a concrete block or a reinforced concrete structure.

[0037] See also Figure 1 and Figure 2As a specific embodiment of the lifting support structure of the existing structure 600 provided by the present invention, the protrusion 310 and the supporting member 300 are integrally formed, and the protrusion 310 and the supporting member 300 are arranged in an L shape; the protrusion 310 is arranged to extend outward from one side of the supporting member 300 to form an L shape, so that when the supporting member 300 is installed in the installation groove 110, the protrusion 310 smoothly enters the avoidance groove 120; the integrally formed protrusion 310 and the bearing member also make the connection strength between the protrusion 310 and the supporting member 300 higher, so that the protrusion 310 can be used securely. The supporting member 300 and the protrusion 310 are a "column leg" structure, which has a good supporting effect.

[0038] See also Figure 2 As a specific embodiment of the supporting structure for lifting the existing structure 600 provided by the present invention, a pre-buried steel plate 330 is provided on the protrusion 310; the steel plate 330 is provided to make the upper end of the protrusion 310 flatter and more secure; after the jacking device 400 is installed on the steel plate 330, the free end of the jacking device 400 acts on the existing structure 600, and the fixed end of the jacking device 400 reacts on the steel plate 330, so that the protrusion 310 will not be deformed or damaged by means of the steel plate 330.

[0039] Preferably, the jacking device 400 includes a plurality of jacks evenly mounted on the protrusion 310, and the lower ends of the jacks are fixedly connected to the steel plate 330; thereby, the existing structure 600 is supported at multiple points, and the force is relatively even. Using the jack as the jacking device 400 is more convenient and easy to control. The lower end of the jack is welded and fixed to the steel plate 330, which is more stable.

[0040] See also Figure 1 and Figure 2 As a specific embodiment of the support structure for lifting an existing structure 600 provided by the present invention, a plurality of mounting grooves 110 in the same group are arranged at intervals along the length direction of the existing structure 600; thereby, the entire existing structure 600 has more stress points in its length direction, the reinforcement effect of the existing structure 600 is better, and the entire support structure plays a sufficient supporting and bearing role.

[0041] See also Figure 2 As a specific embodiment of the supporting structure of the existing structure 600 provided by the present invention, a steel casing is provided on the outside of the bored pile 200. After rotary drilling, the steel casing is provided in the hole, and then grouting is performed to form the bored pile 200. The steel casing can fix the pile hole and protect the hole wall; it can also effectively isolate groundwater, etc., to ensure that the formed bored pile 200 has a higher quality.

[0042] See also Figure 1 and Figure 2The embodiment of the present invention further provides a method for lifting an existing structure 600. The method for lifting an existing structure 600 includes any one of the above-mentioned lifting support structures for the existing structure 600, and further includes:

[0043] S1: adjusting the slurry ratio and the grouting pressure, and performing grouting operations in the area below the bottom of the existing structure 600 to reinforce the foundation 100;

[0044] S2: Drilling holes on both sides of the existing structure 600 and grouting to form bored piles 200, the bored piles 200 penetrate the reinforced foundation 100; multiple bored piles 200 are provided on both sides of the existing structure 600, and the multiple bored piles 200 are arranged along the length direction of the existing structure 600;

[0045] S3: A vertical shaft 500 is constructed above the bored pile 200, and a mounting groove 110 is processed at a position corresponding to the reinforced foundation 100 and the vertical shaft 500, and an avoidance groove 120 is processed on the inner wall of the mounting groove 110; the supporting member 300 is installed in the mounting groove 110 and fixedly connected to the bored pile 200, and the protrusion 310 is installed in the avoidance groove 120;

[0046] S4: Install the jacking device 400 at the operating interval 320 above the protrusion 310, with the lower end of the jacking device 400 fixedly connected to the protrusion 310 and the upper end connected to the bottom of the existing structure 600; start the jacking device 400, and the jacking device 400 generates an upward force and applies it to the existing structure 600.

[0047] The method for lifting the existing structure 600 provided in the embodiment of the present invention adopts the above-mentioned supporting structure for lifting the existing structure 600, that is, when working, a reinforced foundation 100 is first formed under the existing structure 600, and symmetrically arranged bored piles 200 are respectively constructed on both sides of the existing structure 600, and the bored piles 200 are formed by rotary drilling and grouting; the bored piles 200 need to select suitable pile diameters, spacings and depths to have a certain bearing capacity. Then, a vertical shaft 500 is constructed from the position corresponding to the bored pile 200 on the ground, and an installation groove 110 and an escape groove 120 are processed on the reinforced foundation 100; the supporting member 300 is installed in the installation groove 110, and the protrusion 310 is installed in the escape groove 120. Finally, a jacking device 400 is installed at the operating interval 320, and the jacking device 400 is started. The jacking device 400 generates an upward force and applies it to the existing structure 600, so that the existing structure 600 is effectively and firmly supported.

[0048] See also Figure 2As a specific implementation of the method for lifting the existing structure 600 provided by the present invention, before the supporting member 300 is installed in the installation groove 110 in step S3, the steel plate 330 is embedded on the protrusion 310; in step S4, the lower end of the jacking device 400 is fixedly installed on the steel plate 330; the steel plate 330 is arranged to make the upper end of the protrusion 310 have stronger bearing performance and flatter; after the jacking device 400 is installed on the steel plate 330, the free end of the jacking device 400 acts on the existing structure 600, and the fixed end of the jacking device 400 reacts on the steel plate 330, so that the protrusion 310 will not be deformed, damaged, etc. with the help of the steel plate 330.

[0049] See also Figure 2 As a specific implementation of the method for lifting the existing structure 600 provided by the present invention, the upper end surface of the pile 200 is higher than the bottom surface of the installation groove 110, and the lower end of the supporting member 300 is fixedly connected to the upper end of the pile 200; the supporting member 300 is completely connected to the upper end of the pile 200, so that the supporting member 300 is installed more firmly and reliably.

[0050] This existing structure 600 lifting support structure and construction method can play a sufficient supporting role when the new structure 700 crosses the existing structure 600 at a short distance, with poor strata and difficult to ensure reinforcement effect. Compared with only reinforcing the existing structure 600, it is safer and more reliable, and indirectly reduces the safety and quality risks caused by the crossing process, resulting in the settlement and cracking of the existing structure 600, and even the cost of excavation and reinforcement after the existing structure is suspended; it also indirectly shortens the construction period due to the inability to cross the slope adjustment or unavoidable circumstances, saving management fees; fully considers the process of combining the reinforced foundation 100, the pile 200, the support member 300, the protrusion 310 and the jack 400, which has relatively little impact on the surrounding environment and relatively low construction difficulty. Combined with the overdue reinforcement measures in the tunnel, the safety and quality are fully controllable, and it is applicable to tunnel crossing in some complex situations.

[0051] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A lifting support structure for an existing structure, characterized in that: include: A reinforcement foundation is used to be arranged below the existing structure; the reinforcement foundation is provided with two sets of installation grooves respectively located on both sides of the existing structure, and the inner walls of the installation grooves are provided with avoidance grooves extending toward the existing structure, and the avoidance grooves correspond to the upper and lower parts of the existing structure; There are multiple hole piles, which are respectively installed on the two reinforcement foundations; the hole piles are arranged vertically and correspond to the installation grooves; the upper ends of the hole piles are connected to the reinforcement foundation, and the lower ends extend downward in a direction away from the reinforcement foundation; A plurality of supporting members are respectively installed in the two groups of the installation grooves and fixedly connected to the corresponding hole piles; a protrusion installed in the avoidance groove is provided on one side of the supporting member; an operating distance is provided between the upper end of the protrusion and the lower end surface of the existing structure; There are multiple lifters, which correspond one to one with the multiple supporting members; the lifters are installed in the operating interval, and the lower end of the lifters is supported on the protruding part, and the upper end acts on the lower end surface of the existing structure.

2. The existing structure lifting support structure as claimed in claim 1, characterized in that: The upper end surface of the reinforcement foundation and the lower end surface of the existing structure are located on the same plane, and the upper end surface of the supporting member is higher than the upper end surface of the reinforcement foundation and the lower end surface of the existing structure.

3. The existing structure lifting support structure as claimed in claim 2, characterized in that: The protruding portion and the supporting member are integrally formed, and the protruding portion and the supporting member are arranged in an L shape.

4. The existing structure lifting support structure as claimed in claim 1, characterized in that: The protruding portion is provided with a pre-embedded steel plate.

5. The existing structure lifting support structure as claimed in claim 4, characterized in that: The jacking device comprises a plurality of jacks evenly mounted on the protruding portion, and the lower ends of the jacks are fixedly connected to the steel plate.

6. The existing structure lifting support structure as claimed in claim 1, characterized in that: The plurality of installation grooves in the same group are arranged at intervals along the length direction of the existing structure.

7. The existing structure lifting support structure as claimed in claim 1, characterized in that: A steel casing is arranged on the outer side of the hole pile.

8. A method for lifting and constructing an existing structure, characterized in that: The invention comprises the existing structure lifting support structure as claimed in any one of claims 1 to 7; and further comprises: S1: adjusting the slurry ratio and the grouting pressure, and performing grouting operations in the area below the bottom of the existing structure to reinforce the foundation; S2: drilling holes on both sides of the existing structure and grouting to form the bored piles, wherein the bored piles penetrate the reinforced foundation; a plurality of the bored piles are arranged on both sides of the existing structure, and the plurality of the bored piles are arranged along the length direction of the existing structure; S3: constructing a vertical shaft above the pile, processing the installation groove at the position corresponding to the reinforced foundation and the vertical shaft, and processing the avoidance groove on the inner wall of the installation groove; installing the supporting member in the installation groove and fixedly connecting it to the pile, and installing the protruding part into the avoidance groove; S4: Install a jacking device at the operating distance above the protruding portion, wherein the lower end of the jacking device is fixedly connected to the protruding portion, and the upper end is connected to the bottom of the existing structure; start the jacking device, and the jacking device generates an upward force and applies it to the existing structure.

9. The method for lifting and constructing an existing structure as claimed in claim 8, characterized in that: Before installing the supporting member in the installation groove in step S3, a steel plate is embedded in the protruding portion; and in step S4, the lower end of the jack is fixedly installed on the steel plate.

10. The method for lifting and constructing an existing structure as claimed in claim 8, characterized in that: The upper end surface of the hole pile is higher than the bottom surface of the installation groove, and the lower end of the supporting member is fixedly connected to the upper end of the hole pile.

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