Reinforcing and reinforcing device and existing pile foundation reinforcing and reinforcing method

Abstract

The invention relates to a reinforcing device and an existing pile foundation reinforcing method. The method comprises the steps that the reinforcing depth of a to-be-reinforced pile foundation is obtained, and a counter-force pushing device is arranged on the to-be-reinforced pile foundation; the pile foundation to be reinforced is sleeved with a reinforcing element according to the reinforcing depth, the reinforcing element is pressed into the stratum of the pile foundation to be reinforced through a counter-force pushing device, and a pile foundation to be bonded is obtained; an annular gap is formed between the reinforcing element of the to-be-bonded pile foundation and the to-be-reinforced pile foundation, and a grouting pipe and a slurry discharging pipe are inserted into the annular gap; and a building material is injected into the annular gap through the grouting pipe, so that the reinforcing element and the to-be-reinforced pile foundation are tightly bonded through the building material, and the reinforced pile foundation is obtained. According to the method, the reinforcing quality of the to-be-reinforced pile foundation is more reliable, the diameter and rigidity of the foundation part are effectively increased through the reinforcing elements and grouting reinforcement, the vertical and horizontal bearing capacity of the to-be-reinforced pile foundation is remarkably enhanced, and the reinforcing effect is better than that of traditional existing pile foundation periphery grouting reinforcement.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation reinforcement and protection, and in particular to a reinforcement device and an existing pile foundation reinforcement method. Background Art

[0002] The following problems may exist in the application of existing building and bridge pile foundations: on the one hand, a considerable number of pile foundations are relatively low in quality in the early stage due to the consideration of early construction economy and the limitation of low construction level, and the strength or bearing capacity of pile foundation structure is difficult to meet the existing upper load conditions and structural safety requirements; on the other hand, pile foundations buried underground will experience structural performance degradation or deformation damage as the service life increases. For example, the pile foundation of a bridge will cause pile foundation cross-section loss and structural defects due to underwater scouring and corrosion, which may lead to upper structure collapse accidents in severe cases; pile foundations in high seismic intensity areas have serious safety risks due to insufficient bending stiffness, and are very likely to cause large deformation and fracture of pile foundations due to earthquakes and other effects. In addition, due to underground engineering construction activities or special geological changes, the existing pile foundations may also have problems such as deformation due to insufficient vertical and horizontal bearing capacity. Therefore, it is of great significance to strengthen the existing pile foundations under space-constrained conditions to improve the bearing capacity and safety performance of the pile foundation structure.

[0003] Traditional pile foundation reinforcement technologies include increasing the cross-section, reinforcing the ground around the pile foundation by grouting, adding piles and expanding the cap, etc. However, these traditional pile foundation reinforcement technologies have problems such as limited reinforcement depth, difficult to control construction quality, long construction period and high cost. More importantly, the use of traditional pile foundation reinforcement technology for reinforcement construction also has problems such as inconvenience in construction and unstable construction quality due to limited site height. Summary of the invention

[0004] The present application provides a reinforcement device and an existing pile foundation reinforcement method, which are used to solve the technical problems of existing pile foundation reinforcement technology, such as limited construction space, small reinforcement depth, difficult to control construction quality and long construction period.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] On the one hand, a reinforcement device is provided, comprising a plurality of sections of reinforcement elements and a connecting assembly for connecting two adjacent sections of the reinforcement elements;

[0007] A plurality of connection holes are provided in each section of the reinforcement element, an anchoring cavity is provided at the bottom end of each connection hole, a groove cavity is provided on the reinforcement element at the top end of each connection hole, and a liquid injection hole is provided on the reinforcement element at one side of the anchoring cavity;

[0008] The connection assembly comprises a connection piece, one end of which is provided with a hexagonal threaded connection head for connection.

[0009] Preferably, the connection assembly further includes a pre-tightening element and a fastener, the pre-tightening element is arranged on the groove cavity, the connection member passes through the pre-tightening element and is arranged in the connection hole, and the fastener is used to fix the connection member on the reinforcement element.

[0010] Preferably, the reinforcement element comprises two semi-cylindrical steel plates, and the two semi-cylindrical steel plates are spliced ​​by welding.

[0011] Preferably, the reinforcement element is a precast concrete lining segment; and / or the connecting piece is a PC steel rod.

[0012] Preferably, the diameter of the connecting hole is smaller than the diameter of the anchoring cavity; and / or, the diameter of the connecting hole is smaller than the diameter of the groove cavity or the diagonal length of the groove cavity; and / or, the anchoring cavity, the connecting hole and the groove cavity are coaxially arranged.

[0013] Preferably, the connector is provided with connecting threads; and / or the diagonal length of the hexagonal threaded connector is smaller than the diameter of the anchoring cavity; and / or a threaded hole matching the connector is provided at the center of the hexagonal threaded connector.

[0014] In another aspect, a method for reinforcing an existing pile foundation is provided, comprising the following steps:

[0015] Obtaining the reinforcement depth of the pile foundation to be reinforced, and providing a reaction force jacking device on the pile foundation to be reinforced;

[0016] According to the reinforcement depth, a reinforcement element is sleeved on the pile foundation to be reinforced and the reaction force jacking device is used to press the reinforcement element into the stratum of the pile foundation to be reinforced to obtain the pile foundation to be bonded; an annular space is provided between the reinforcement element of the pile foundation to be bonded and the pile foundation to be reinforced, and a grouting pipe and a grouting pipe are inserted into the annular space;

[0017] Injecting building materials into the annular space through the grouting pipe to tightly bond the reinforcing element to the pile foundation to be reinforced through the building materials to obtain a reinforced pile foundation;

[0018] Wherein, the reinforcement element is a reinforcement steel plate matching the shape of the pile foundation to be reinforced or the reinforcement element in the above-mentioned reinforcement device.

[0019] Preferably, if the reinforcing element is a reinforcing steel plate matching the shape of the pile foundation to be reinforced, the reinforcing element is sleeved on the pile foundation to be reinforced according to the reinforcement depth and the reaction force jacking device is used to press the reinforcing element into the stratum of the pile foundation to be reinforced, so as to obtain the pile foundation to be bonded, comprising:

[0020] Obtaining specification data of the reinforcing steel plate, and determining the number of first sections of the reinforcing steel plate required according to the reinforcement depth and the specification data;

[0021] The reinforcing steel plate described in the first section is sleeved on the pile foundation to be reinforced, and the reaction-force jacking device is used to press the reinforcing steel plate described in the first section into the stratum of the pile foundation to be reinforced; then the reinforcing steel plate described in the second section is sleeved on the pile foundation to be reinforced and the reinforcing steel plate described in the first section is fixedly connected to the reinforcing steel plate described in the second section, and the reaction-force jacking device is used to press the reinforcing steel plate described in the second section into the stratum of the pile foundation to be reinforced, until all the reinforcing steel plates according to the first section are pressed into the stratum of the pile foundation to be reinforced by the reaction-force jacking device, so as to obtain the pile foundation to be bonded.

[0022] Preferably, if the reinforcing element is a reinforcing element that matches the shape of the pile foundation to be reinforced, according to the reinforcement depth, the reinforcing element is sleeved on the pile foundation to be reinforced and the reaction force jacking device is used to press the reinforcing element into the stratum of the pile foundation to be reinforced, so as to obtain the pile foundation to be bonded, comprising:

[0023] Acquire the length data of the reinforcing element, and determine the number of the second sections of the reinforcing element required according to the reinforcement depth and the length data;

[0024] The first section of the reinforcement element is sleeved on the pile foundation to be reinforced, and the reaction-force jacking device is used to press the first section of the reinforcement element into the stratum of the pile foundation to be reinforced; then the second section of the reinforcement element is sleeved on the pile foundation to be reinforced and the two adjacent sections of the reinforcement element are fixedly connected by connecting parts to implement prestress, and the reaction-force jacking device is used to press the second section of the reinforcement element into the stratum of the pile foundation to be reinforced, until all the reinforcement elements according to the second section are pressed into the stratum of the pile foundation to be reinforced by the reaction-force jacking device, so as to obtain the pile foundation to be bonded.

[0025] Preferably, the content of fixedly connecting the reinforcement element described in the first section with the reinforcement element described in the second section by means of a connector to implement prestressing comprises:

[0026] Insert the connecting piece into the connecting hole of the reinforcing element of the first section, insert the lower end of the connecting piece into the anchoring cavity of the reinforcing element of the first section, and inject a fixing agent into the anchoring cavity through the liquid injection hole to fix the lower end of the connecting piece;

[0027] Insert the pre-tightening element through the connecting piece of the reinforcing element described in the first section and embed it into the corresponding groove cavity, install the fastener on the top of the pre-tightening element, and pre-tighten the connecting piece by tightening the fastener; then install the hexagonal threaded connector on the top of the fastener and tighten it;

[0028] The reinforcing element of the second section is aligned with the connecting hole of the reinforcing element of the first section, and the connecting piece is inserted into the connecting hole of the reinforcing element of the second section, and the lower end of the connecting piece of the reinforcing element of the second section is connected and fixed to the hexagonal threaded connector of the reinforcing element of the first section;

[0029] The liquid injection hole at the lower end of the reinforcement element described in the second section injects a fixing agent into the corresponding anchor cavity to fix the corresponding connecting piece; the upper end of the connecting piece of the reinforcement element described in the second section is installed with a pre-tightening element, a fastener and a hexagonal threaded connector.

[0030] Preferably, an auxiliary positioning element for centering the reinforcement element and the pile foundation to be reinforced is provided between the reinforcement element and the annular space; and / or the auxiliary positioning element is a thin-walled steel structure having an arch bridge shape.

[0031] The reinforcement device and the existing pile foundation reinforcement method, the reinforcement device comprises a plurality of reinforcement elements and a connection assembly connecting two adjacent reinforcement elements; a plurality of connection holes are provided in each reinforcement element, an anchoring cavity is provided at the bottom end of each connection hole, a groove cavity is provided on the reinforcement element at the top end of each connection hole, and a liquid injection hole is provided on the reinforcement element at one side of the anchoring cavity; the connection assembly comprises a connection piece, one end of which is provided with a hexagonal threaded connection head for connection.

[0032] It can be seen from the above technical scheme that the present application has the following advantages: the reinforcement device is applied to the pile foundation to be reinforced to improve the corrosion resistance of the reinforced pile foundation and reduce the cost, solving the technical problems of the existing pile foundation reinforcement technology, such as limited construction space, small reinforcement depth, difficult to control construction quality and long construction period.

[0033] The existing pile foundation reinforcement method has a more reliable reinforcement quality for the pile foundation to be reinforced. Through reinforcement elements and grouting reinforcement, the diameter and stiffness of the foundation part are effectively increased, and the vertical and horizontal bearing capacity of the pile foundation to be reinforced are significantly enhanced. The reinforcement effect is better than the traditional grouting reinforcement around the existing pile foundation. The existing pile foundation reinforcement method has a short reinforcement period, and the construction does not require foundation pit excavation and dewatering operations and construction of retaining structures, avoiding the problem of exposing the pile body during the traditional pile foundation cross-section increase reinforcement construction, especially the reinforcement of existing underwater pile foundations. It solves the technical problems of existing pile foundation reinforcement technology, such as limited construction space, small reinforcement depth, difficult to control construction quality, and long construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, 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 application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 This is a schematic diagram of the structure of the reinforcement device described in the embodiment of the present application;

[0036] Figure 2 It is a schematic cross-sectional view of the reinforcement device described in an embodiment of the present application;

[0037] Figure 3 In the reinforcement device described in the embodiment of the present application Figure 2 Schematic diagram of the enlarged structure at Ⅱ;

[0038] Figure 4 A flowchart of the steps of the existing pile foundation reinforcement method described in the embodiment of the present application;

[0039] Figure 5 A schematic diagram of the reinforcement construction of the existing pile foundation reinforcement method described in the embodiment of the present application;

[0040] Figure 6 It is a schematic diagram of the structure of the reinforcement steel plate in the existing pile foundation reinforcement method described in the embodiment of the present application;

[0041] Figure 7 It is a structural schematic diagram of an auxiliary positioning element in the existing pile foundation reinforcement method described in an embodiment of the present application;

[0042] Figure 8 This is a schematic diagram of the structure of the connection of two sections of reinforcement elements in the existing pile foundation reinforcement method described in the embodiment of the present application:

[0043] Fig. 9 In the reinforcement device described in the embodiment of the present application Figure 2 Schematic diagram of the enlarged structure at point Ⅰ. DETAILED DESCRIPTION

[0044] In order to make the purpose, features, and advantages of the invention of this application more obvious and easy to understand, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described below are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] In the description of the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot 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 embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0046] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] The embodiments of the present application provide a reinforcement device and an existing pile foundation reinforcement method, which solve the technical problems of existing pile foundation reinforcement technology, such as limited construction space, small reinforcement depth, difficult to control construction quality, and long construction period.

[0048] Embodiment 1:

[0049] Figure 1 This is a schematic diagram of the structure of the reinforcement device described in the embodiment of the present application. Figure 2 is a schematic cross-sectional view of the reinforcement device according to an embodiment of the present application, Figure 3 In the reinforcement device described in the embodiment of the present application Figure 2 Schematic diagram of the enlarged structure at Ⅱ.

[0050] like Figures 1 to 3 As shown, an embodiment of the present application provides a reinforcement device, including a plurality of reinforcement elements 9 and a connecting assembly connecting two adjacent reinforcement elements 9.

[0051] It should be noted that the reinforcement element 9 can be selected as a precast concrete lining segment. Two adjacent sections of the reinforcement element 9 are connected by a connection assembly and prestressed. In this embodiment, each section of the reinforcement element 9 can be composed of two or more precast concrete segments spliced ​​along the circumferential direction. The shape characteristics of the precast concrete lining segment are similar to the shape of the pile foundation to be reinforced (such as a cylinder), and the precast concrete segment can be customized into a square or other shape. The reinforcement device is applied to the pile foundation to be reinforced to improve the corrosion resistance of the reinforced pile foundation and reduce the cost. It solves the technical problems of the existing pile foundation reinforcement technology that the construction quality is difficult to control and the cost is high.

[0052] In an embodiment of the present application, the reinforcement element includes two semi-cylindrical steel plates, and the two semi-cylindrical steel plates are spliced ​​by welding.

[0053] In the embodiment of the present application, a plurality of connection holes 94 are provided in each section of the reinforcement element 9, an anchoring cavity 92 is provided at the bottom end of each connection hole 94, a groove cavity 93 is provided on the reinforcement element 9 located at the top of each connection hole 94, and a liquid injection hole 91 is provided on the reinforcement element 9 located on one side of the anchoring cavity 92.

[0054] It should be noted that a connection hole 94 is provided in the tube wall of each section of the reinforcing element 9. A liquid injection hole 91 communicating with the outer tube wall of the reinforcing element 9 is provided at the lower end of each section of the reinforcing element 9. Figure 3 As shown, an anchoring cavity 92 of a certain diameter is provided on the inner side of the bottom end of the connecting hole 94, and a connecting hole 94 penetrating to the upper end of the reinforcing element 9 is provided on the upper part of the anchoring cavity 92. The lower end of the anchoring cavity 92 of the first section reinforcing element 9 of the reinforcing device is set to be closed, and the anchoring cavities 92 of the remaining reinforcing elements 9 are penetrating to the lower end surface of the corresponding reinforcing element 9. A sunken groove cavity 93 is provided on the upper end surface of the reinforcing element 9. In this embodiment, the diameter of the connecting hole 94 is smaller than the diameter of the anchoring cavity 92, and the diameter of the connecting hole 94 is smaller than the diameter of the groove cavity 93 or the diagonal side length of the groove cavity 93. The anchoring cavity 92, the connecting hole 94 and the groove cavity 93 are all coaxially arranged, and together constitute the connecting hole of the reinforcing element 9, which is prefabricated during the processing of the reinforcing element 9, and the connecting holes are arranged in a circular array along the circumference of the tube wall of the reinforcing element 9.

[0055] like Figure 1 As shown, in the embodiment of the present application, the connecting assembly includes a connecting member 10, a pre-tightening element 12 and a fastener 11, and one end of the connecting member 10 is provided with a hexagonal threaded connector 13 for connection; the pre-tightening element 12 is arranged on the groove cavity 93, and the connecting member 10 is arranged in the connecting hole 94 through the pre-tightening element 12, and the fastener 11 is used to fix the connecting member 10 on the reinforcing element 9.

[0056] It should be noted that the connector 10 can be selected as a PC steel rod, and the upper and lower ends or the entire length of the PC steel rod are provided with threads to cooperate with other parts to achieve prestressed connection. The preload element 12 can be selected as a gasket, and the fastener 11 can be selected as a nut. The connector 10 is provided with connecting threads; and / or, the diagonal length of the hexagonal threaded connector 13 is less than the diameter of the anchor cavity 92; and / or, the center of the hexagonal threaded connector 13 is provided with a threaded hole that matches the connector 10. In this embodiment, the matching connector 10 includes a nut, a gasket and a hexagonal threaded connector. Among them, the gasket has an outer contour of a polygon, a circular hole structure is opened in the center, and the center hole passes through the PC steel rod. The diagonal length of the hexagonal threaded connector 13 is slightly less than the diameter of the anchor cavity 92, and the center of the hexagonal threaded connector 13 is provided with a threaded hole that matches the PC steel rod. The reinforcement device connects two adjacent sections of reinforcement elements by prestressing through a connecting component.

[0057] The present application provides a reinforcement device, including multiple sections of reinforcement elements and a connection assembly connecting two adjacent sections of reinforcement elements; each section of the reinforcement element is provided with a plurality of connection holes, the bottom end of each connection hole is provided with an anchoring cavity, the reinforcement element located at the top of each connection hole is provided with a groove cavity, and the reinforcement element located on one side of the anchoring cavity is provided with a liquid injection hole; the connection assembly includes a connector, one end of which is provided with a hexagonal threaded connector for connection. The reinforcement device is applied to the pile foundation to be reinforced to improve the corrosion resistance of the reinforced pile foundation and reduce the cost, and solves the technical problems of the existing pile foundation reinforcement technology, such as limited construction space, small reinforcement depth, difficult to control construction quality, and long construction period.

[0058] Embodiment 2:

[0059] Figure 4 This is a flowchart of the steps of the existing pile foundation reinforcement method described in the embodiment of the present application. Figure 5 It is a schematic diagram of the reinforcement construction of the existing pile foundation reinforcement method described in the embodiment of the present application.

[0060] like Figure 4 and Figure 5 As shown, the embodiment of the present application provides a method for reinforcing an existing pile foundation, comprising the following steps:

[0061] S1. Obtain the reinforcement depth of the pile foundation to be reinforced, and set a reaction force jacking device on the pile foundation to be reinforced.

[0062] It should be noted that in step S1, the reinforcement depth of the pile foundation to be reinforced is first obtained, and a reaction force jacking device is set on the pile foundation to provide power for the subsequent step of reinforcing the pile foundation. In this embodiment, the pile foundation to be reinforced can be called an existing pile foundation.

[0063] like Figure 5As shown, in the embodiment of the present application, the reaction force pushing device includes a reaction force bracket 3 and a pushing mechanism 4 installed on the reaction force bracket 3.

[0064] It should be noted that a reaction support 3 is arranged on the pile foundation to be reinforced, and the reaction support 3 has a shape feature similar to that of the pile foundation to be reinforced, so that the reaction support 3 can be fixed on the pile foundation to be reinforced. The upper end of the reaction support 3 is against the upper existing bridge structure 1, and the reaction support 3 is constrained by the existing bridge structure 1. The reaction support 3 can be locked or fixed on the pile foundation to be reinforced, and the reaction support 3 can be fixed by the friction force generated by clasping or drilling holes on the pile foundation to be reinforced. The reaction support 3 is provided with a slot or a fixing structure for fixing the jacking mechanism 4.

[0065] In an embodiment of the present application, after the reaction support 3 is fixed on the pile foundation to be reinforced, a pushing mechanism 4 is installed on the reaction support 3. The pushing mechanism is composed of a fixed plate 41, a driving source 42 and a pushing plate 43. Among them, the fixed plate 41 is fixed on the reaction support 3 to provide a supporting reaction force for the pushing mechanism 4. The lower part of the pushing mechanism 4 is a pushing plate 43, which is used to push the reinforcement structure (such as a reinforcement element) downward. The driving source 42 is located between the fixed plate 41 and the pushing plate 43, and is used to provide a downward pushing force. When the supporting reaction force provided by the reaction support 3 is insufficient or affects the safety of the existing building 1, the pushing mechanism 4 can install an anchor rod 5 on the fixed plate 41, and the lower end of the anchor rod 5 is constructed as a ground anchor, and the reaction support 3 and the ground anchor are jointly subjected to force to provide sufficient reaction force.

[0066] It should be noted that the driving source 42 can be selected as an oil cylinder. In other embodiments, the driving source 42 can also be selected as an electric power, various forms of cylinders or a pushing power device.

[0067] S2. According to the reinforcement depth, a reinforcing element is sleeved on the pile foundation to be reinforced and a reaction force jacking device is used to press the reinforcing element into the stratum of the pile foundation to be reinforced, so as to obtain a pile foundation to be bonded; an annular space is provided between the reinforcing element of the pile foundation to be bonded and the pile foundation to be reinforced, and a grouting pipe 7 and a grouting pipe 8 are inserted into the annular space. The reinforcing element is a reinforcing steel plate matching the shape of the pile foundation to be reinforced or a reinforcing element in the above-mentioned reinforcing device.

[0068] It should be noted that the contents of the reinforcement device have been described in Example 1, and the contents of the reinforcement device will not be repeated in this embodiment. In step S2, the reinforcement element arranged on the pile foundation to be reinforced is pressed into the stratum of the pile foundation to be reinforced by the reaction force jacking device according to the reinforcement depth to obtain the pile foundation to be bonded. In the embodiment of the present application, in the process of using the reaction force jacking device to press the reinforcement element into the stratum of the pile foundation to be reinforced, the reinforcement element can be arranged under the jacking plate 43 of the jacking mechanism 4 after the installation of the pile foundation to be reinforced is completed. The reinforcement element applies a downward thrust to the jacking plate 43 through the driving source 42, and the jacking plate 43 presses the reinforcement element downward into the stratum of the pile foundation to be reinforced through the jacking action, and the pressing reaction force is provided by the reaction force support 3.

[0069] Figure 6 It is a schematic diagram of the structure of the reinforcing steel plate in the existing pile foundation reinforcement method described in an embodiment of the present application.

[0070] like Figure 6 As shown, in the embodiment of the present application, the reinforcing steel plate can be selected as a semi-circular tubular structure or an arc-shaped structure, and the diameter of the reinforcing steel plate is greater than the diameter of the pile foundation 2 to be reinforced or the longest diagonal length of the pile foundation to be reinforced. Two or more pieces of semi-circular tubular or arc-shaped steel plates can be connected laterally symmetrically to form a section of a circular tubular reinforcing steel plate 6, and the reinforcing steel plate 6 is sleeved on the pile foundation 2 to be reinforced, and there is a certain annular gap between the reinforcing steel plate 6 and the pile foundation 2 to be reinforced.

[0071] It should be noted that the two semi-circular tubular structures are laterally connected by welding to form an integral section of reinforcing steel plate. The structural characteristics of the reinforcing steel plate can be adjusted according to the shape characteristics of the pile foundation to be reinforced and the reinforcement requirements, and can be set to a square or other special shape.

[0072] S3. Inject building materials into the annular space through the grouting pipe to tightly bond the reinforcing element to the pile foundation to be reinforced through the building materials to obtain a reinforced pile foundation.

[0073] It should be noted that the building material can be selected as high-strength cement mortar. After the reinforcement element on the pile foundation to be reinforced reaches the designed reinforcement depth, the building material is injected from bottom to top into the annular gap between the reinforcement element and the pile foundation to be reinforced. The building material can be injected using a grouting pipe 7, or it can be directly poured from the top, so that the inner wall of the pile foundation to be reinforced and the reinforcement element are tightly bonded to form a steel-concrete composite structure with greater rigidity, thereby improving the lateral rigidity and compressive rigidity of the reinforced pile section. After the pile foundation is reinforced, a reinforced pile foundation composed of reinforcement elements, concrete, and existing pile foundation is formed from the outside to the inside. In this embodiment, when the reinforcement construction depth reaches the pile end of the existing pile foundation, a rigid grouting pipe 7 can be used to insert the bearing layer (such as the annular gap) at the pile end, and high-pressure grouting (such as cement mortar) can be carried out to further enhance the strength of the bearing layer at the pile end of the existing pile foundation and improve the bearing capacity of the pile end of the existing pile foundation.

[0074] In the embodiment of the present application, as the multi-section reinforcement element is pressed into the stratum of the pile foundation to be reinforced, during the process of the reinforcement element being lowered to the stratum of the pile foundation to be reinforced, a grouting pipe 7 is arranged in the annular gap between the reinforcement element and the pile foundation to be reinforced, and a nozzle is installed at the bottom of the grouting pipe 7. The nozzle forms a high-pressure water jet to crush the rock and soil and stir the soil to form mud, which can reduce the pressure resistance; at the same time, a slurry discharge pipe 8 is arranged at the bottom of the annular gap, and the slurry discharge pipe 8 is connected to the ground, and the slurry discharge pipe 8 and the suction pump are arranged side by side. The suction pump, the slurry discharge pipe 8 and the grouting pipe 7 cooperate to form a positive cycle to discharge the rock and soil particles at the bottom of the muddy water annulus, so that an annular gap is formed between the reinforcement element and the pile foundation 2 to be reinforced, which is convenient for subsequent grouting or filling with concrete reinforcement, such as Figure 5 As shown in d.

[0075] The existing pile foundation reinforcement method provided by the present application includes obtaining the reinforcement depth of the pile foundation to be reinforced, and arranging a reaction force jacking device on the pile foundation to be reinforced; according to the reinforcement depth, a reinforcement element is sleeved on the pile foundation to be reinforced and the reaction force jacking device is used to press the reinforcement element into the stratum of the pile foundation to be reinforced, so as to obtain the pile foundation to be bonded; an annular space gap is arranged between the reinforcement element of the pile foundation to be bonded and the pile foundation to be reinforced, and a grouting pipe and a grouting pipe are inserted into the annular space gap; building materials are injected into the annular space gap through the grouting pipe to tightly bond the reinforcement element to the pile foundation to be reinforced through the building materials, so as to obtain a reinforced pile foundation; wherein the reinforcement element is a reinforcement steel plate matching the shape of the pile foundation to be reinforced or a reinforcement element in the above-mentioned reinforcement device. The existing pile foundation reinforcement method has a more reliable reinforcement quality for the pile foundation to be reinforced. Through reinforcement elements and grouting reinforcement, the diameter and stiffness of the foundation part are effectively increased, and the vertical and horizontal bearing capacity of the pile foundation to be reinforced are significantly enhanced. The reinforcement effect is better than the traditional grouting reinforcement around the existing pile foundation. The existing pile foundation reinforcement method has a short reinforcement period, and the construction does not require foundation pit excavation and dewatering operations and construction of retaining structures, avoiding the problem of exposing the pile body during the traditional pile foundation cross-section increase reinforcement construction, especially the reinforcement of existing underwater pile foundations. It solves the technical problems of existing pile foundation reinforcement technology, such as limited construction space, small reinforcement depth, difficult to control construction quality, and long construction period.

[0076] It should be noted that the existing pile foundation reinforcement method can realize the reinforcement of the existing pile foundation under low headroom construction conditions, using the existing pile foundation as a support reaction force, and the reinforcement depth of the existing pile foundation is large. By adjusting the reinforcement starting position, the bridge pier above the reinforcement starting position and the foundation below it can be reinforced at the same time. The existing pile foundation reinforcement method can avoid disturbing the stability of the existing structure, can ensure the normal use of structures such as bridges during construction, and the construction is environmentally friendly and economical.

[0077] Figure 7It is a structural schematic diagram of the auxiliary positioning element in the existing pile foundation reinforcement method described in an embodiment of the present application.

[0078] like Figure 7 As shown, in one embodiment of the present application, an auxiliary positioning element 14 is provided between the reinforcement element and the annular space for centering the reinforcement element and the pile foundation 2 to be reinforced; and / or the auxiliary positioning element 14 is a thin-walled steel structure having an arch bridge shape.

[0079] It should be noted that if the reinforcing element is a reinforcing steel plate, an auxiliary positioning element 14 is provided in the annular gap between the reinforcing steel plate and the pile foundation to be reinforced, and the auxiliary positioning element 14 is vertically installed on the inner wall of the reinforcing steel plate. The auxiliary positioning element 14 is installed by welding or bolt connection, and the auxiliary positioning element 14 on the reinforcing steel plate is installed symmetrically along the axis of the pile foundation 2 to be reinforced. If the reinforcing element is a reinforcement element, when the auxiliary positioning element 14 is installed inside the reinforcement element, the auxiliary positioning element 14 is installed by bolt connection. Installing the auxiliary positioning element 14 in the reinforcing element can effectively achieve the centering arrangement between the reinforcing element and the pile foundation 2 to be reinforced.

[0080] like Figure 5 As shown, in one embodiment of the present application, if the reinforcing element is a reinforcing steel plate that matches the shape of the pile foundation to be reinforced, the reinforcing element is sleeved on the pile foundation to be reinforced according to the reinforcement depth and the reinforcing element is pressed into the stratum of the pile foundation to be reinforced by a reaction force jacking device, and the pile foundation to be bonded includes:

[0081] Obtain the specification data of the reinforcement steel plate, and determine the number of the first section of the reinforcement steel plate required according to the reinforcement depth and the specification data;

[0082] The first section of the reinforcing steel plate is sleeved on the pile foundation to be reinforced, and the reaction-force jacking device is used to press the first section of the reinforcing steel plate into the stratum of the pile foundation to be reinforced; then the second section of the reinforcing steel plate is sleeved on the pile foundation to be reinforced and the first section of the reinforcing steel plate is fixedly connected to the second section of the reinforcing steel plate, and the reaction-force jacking device is used to press the second section of the reinforcing steel plate into the stratum of the pile foundation to be reinforced, until all the reinforcing steel plates according to the number of the first section are pressed into the stratum of the pile foundation to be reinforced by the reaction-force jacking device, so as to obtain the pile foundation to be bonded.

[0083] It should be noted that the specification data of the reinforcing steel plate can be the height of the cylindrical reinforcing steel plate, and the ratio of the reinforcement depth to the specification data is rounded off to obtain the number of the first section of the reinforcing steel plate. In this embodiment, two sections of reinforcing steel plates are used as a case study. When one section of the reinforcing steel plate is pressed into the formation or the driving source 42 has completed its downward stroke, the next section of the reinforcing steel plate is connected, and the two adjacent sections of the reinforcing steel plates are connected by welding. Among them, the lateral welds of the two adjacent sections of the reinforcing steel plates can be staggered to avoid being on the same vertical line, which is beneficial to avoid the failure of multiple sections of reinforcing steel plates due to cracking along the same welding surface. Preferably, the welding method can adopt an automatic welding method to ensure the welding quality and stability. Figure 5 As shown in c.

[0084] Figure 8 This is a schematic diagram of the structure of the connection of two sections of reinforcement elements in the existing pile foundation reinforcement method described in the embodiment of the present application. Fig. 9 In the reinforcement device described in the embodiment of the present application Figure 2 Schematic diagram of the enlarged structure at point Ⅰ.

[0085] like Figure 8 and Fig. 9 As shown, in one embodiment of the present application, if the reinforcing element is a reinforcing element that matches the shape of the pile foundation to be reinforced, the reinforcing element is sleeved on the pile foundation to be reinforced according to the reinforcement depth and the reinforcing element is pressed into the stratum of the pile foundation to be reinforced by a reaction force jacking device, and the pile foundation to be bonded includes:

[0086] Obtain the length data of the reinforcement element, and determine the number of the second section of the reinforcement element required according to the reinforcement depth and length data;

[0087] The first section of the reinforcement element is sleeved on the pile foundation to be reinforced, and the first section of the reinforcement element is pressed into the stratum of the pile foundation to be reinforced by using a reaction force jacking device; the second section of the reinforcement element is sleeved on the pile foundation to be reinforced, and two adjacent sections of the reinforcement element are fixedly connected by a connector to implement prestress, and the second section of the reinforcement element is pressed into the stratum of the pile foundation to be reinforced by using a reaction force jacking device, until all the reinforcement elements according to the number of the second section are pressed into the stratum of the pile foundation to be reinforced by using the reaction force jacking device, so as to obtain the pile foundation to be bonded;

[0088] The content of fixedly connecting the first section reinforcement element and the second section reinforcement element by means of a connector to implement prestressing includes:

[0089] Insert the connecting piece into the connecting hole of the first section reinforcing element, insert the lower end of the connecting piece into the anchoring cavity of the first section reinforcing element, and inject a fixing agent into the anchoring cavity through the liquid injection hole to fix the lower end of the connecting piece;

[0090] Insert the pre-tightening element through the connecting piece of the first section reinforcement element and insert it into the corresponding groove cavity, install the fastener on the top of the pre-tightening element, and pre-tighten the connecting piece by tightening the fastener; then install the hexagonal threaded connector on the top of the fastener and tighten it;

[0091] The second reinforcement element is aligned with the connection hole of the first reinforcement element, and a connecting piece is inserted into the connection hole of the second reinforcement element, and the lower end of the connecting piece of the second reinforcement element is connected and fixed to the hexagonal threaded connector of the first reinforcement element;

[0092] The liquid injection hole at the lower end of the second section reinforcement element injects a fixing agent into the corresponding anchor cavity to fix the corresponding connecting piece; the upper ends of the connecting pieces of the second section reinforcement element are all installed with pre-tightening elements, fasteners and hexagonal threaded connectors.

[0093] It should be noted that the length data of the reinforcement element can be the height of the cylindrical reinforcement element, and the ratio of the reinforcement depth to the length data is truncated to obtain the second section number of the reinforcement element. In this embodiment, the connection of two sections of reinforcement elements on the pile foundation to be reinforced is used as an example to illustrate that the connection operation of multiple sections of reinforcement elements can be understood as follows: after the first section of the reinforcement element is installed and reinforced to the ground of the device to be reinforced through the reaction force jacking device, the connector 10 is inserted into the connection hole 94, and the lower end of the connector 10 enters a certain distance into the anchor cavity 92; after installation, the connector 10 is higher than the upper end surface of the reinforcement element by a certain length. Then, high-strength concrete is injected into the anchor cavity 92 through the liquid injection hole 91 to fix the lower end of the connector 10. After the lower end of the connector 10 is fixed, the pre-tightening element 12 is passed through the connector 10 and embedded in the groove cavity 93. Then the fastener 11 is installed above the pre-tightening element 12, and the pre-tightening connection of the connector 10 is achieved by tightening the fastener 11. Then install the hexagonal thread connector 13 on the fastener 11 and tighten it. Figures 3 to 7 ) Lift the second section of the reinforcement element, align the connection holes 94 of the two adjacent sections of the reinforcement elements, and insert the connector 10 into the connection hole 4, and the lower end of the connector 10 is connected and fixed with the hexagonal threaded connector 13. Then, high-strength concrete is injected into the anchor cavity 92 through the liquid injection hole 91 at the lower end of the second section of the reinforcement element to further fix the connector 10. The preload element 12, the fastener 11 and the hexagonal threaded connector 13 are continued to be installed on the connector 10 at the upper end of the second section of the reinforcement element, and then the connection of multiple sections of the reinforcement elements is achieved by repeating this step. Among them, the lateral joints of the two adjacent reinforcement elements in the upper section are located in the complete reinforcement element in the lower section. Through the prestressed connection of multiple connectors 10 of the two adjacent sections of the reinforcement elements, the connection of the two adjacent sections of the reinforcement elements and the lateral connection between the multiple precast concrete segments in each section can be directly achieved, which is conducive to simplifying the connection structure and construction cost of the reinforcement elements.

[0094] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0095] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0096] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0097] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0098] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, etc., various media that can store program codes.

[0099] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A reinforcement device, characterized in that: It comprises a plurality of sections of reinforcing elements and a connecting assembly connecting two adjacent sections of the reinforcing elements; A plurality of connection holes are provided in each section of the reinforcement element, an anchoring cavity is provided at the bottom end of each connection hole, a groove cavity is provided on the reinforcement element at the top end of each connection hole, and a liquid injection hole is provided on the reinforcement element at one side of the anchoring cavity; The connection assembly comprises a connection piece, one end of which is provided with a hexagonal threaded connection head for connection.

2. The reinforcement device according to claim 1, characterized in that: The connection assembly further includes a pre-tightening element and a fastener, wherein the pre-tightening element is arranged on the groove cavity, the connection member passes through the pre-tightening element and is arranged in the connection hole, and the fastener is used to fix the connection member on the reinforcement element.

3. The reinforcement device according to claim 1 or 2, characterized in that: The reinforcement element comprises two semi-cylindrical steel plates, and the two semi-cylindrical steel plates are spliced ​​by welding.

4. The reinforcement device according to claim 1 or 2, characterized in that: The reinforcement element is a precast concrete lining segment; and / or the connecting piece is a PC steel rod.

5. The reinforcement device according to claim 1 or 2, characterized in that: The diameter of the connecting hole is smaller than the diameter of the anchoring cavity; and / or, the diameter of the connecting hole is smaller than the diameter of the groove cavity or the diagonal length of the groove cavity; and / or, the anchoring cavity, the connecting hole and the groove cavity are coaxially arranged.

6. The reinforcement device according to claim 1 or 2, characterized in that: The connecting piece is provided with connecting threads; and / or the diagonal length of the hexagonal threaded connector is smaller than the diameter of the anchoring cavity; and / or the center of the hexagonal threaded connector is provided with a threaded hole matching the connecting piece.

7. A method for reinforcing an existing pile foundation, characterized in that: The following steps are involved: Obtaining the reinforcement depth of the pile foundation to be reinforced, and providing a reaction force jacking device on the pile foundation to be reinforced; According to the reinforcement depth, a reinforcement element is sleeved on the pile foundation to be reinforced and the reaction force jacking device is used to press the reinforcement element into the stratum of the pile foundation to be reinforced to obtain the pile foundation to be bonded; an annular space is provided between the reinforcement element of the pile foundation to be bonded and the pile foundation to be reinforced, and a grouting pipe and a grouting pipe are inserted into the annular space; Injecting building materials into the annular space through the grouting pipe to tightly bond the reinforcing element to the pile foundation to be reinforced through the building materials to obtain a reinforced pile foundation; Wherein, the reinforcing element is a reinforcing steel plate matching the shape of the pile foundation to be reinforced or a reinforcing element in the reinforcing device as described in any one of claims 1-6.

8. The existing pile foundation reinforcement method according to claim 7, characterized in that: If the reinforcing element is a reinforcing steel plate that matches the shape of the pile foundation to be reinforced, the reinforcing element is sleeved on the pile foundation to be reinforced according to the reinforcement depth and the counter-force jacking device is used to press the reinforcing element into the stratum of the pile foundation to be reinforced, to obtain the pile foundation to be bonded, comprising: Obtaining specification data of the reinforcing steel plate, and determining the number of first sections of the reinforcing steel plate required according to the reinforcement depth and the specification data; The reinforcing steel plate described in the first section is sleeved on the pile foundation to be reinforced, and the reaction-force jacking device is used to press the reinforcing steel plate described in the first section into the stratum of the pile foundation to be reinforced; then the reinforcing steel plate described in the second section is sleeved on the pile foundation to be reinforced and the reinforcing steel plate described in the first section is fixedly connected to the reinforcing steel plate described in the second section, and the reaction-force jacking device is used to press the reinforcing steel plate described in the second section into the stratum of the pile foundation to be reinforced, until all the reinforcing steel plates according to the first section are pressed into the stratum of the pile foundation to be reinforced by the reaction-force jacking device, so as to obtain the pile foundation to be bonded.

9. The existing pile foundation reinforcement method according to claim 7, characterized in that: If the reinforcing element is a reinforcing element that matches the shape of the pile foundation to be reinforced, the reinforcing element is sleeved on the pile foundation to be reinforced according to the reinforcement depth and the counter-force jacking device is used to press the reinforcing element into the stratum of the pile foundation to be reinforced, to obtain the pile foundation to be bonded, comprising: Acquire the length data of the reinforcing element, and determine the number of the second sections of the reinforcing element required according to the reinforcement depth and the length data; The first section of the reinforcement element is sleeved on the pile foundation to be reinforced, and the reaction-force jacking device is used to press the first section of the reinforcement element into the stratum of the pile foundation to be reinforced; then the second section of the reinforcement element is sleeved on the pile foundation to be reinforced and the two adjacent sections of the reinforcement element are fixedly connected by connecting parts to implement prestress, and the reaction-force jacking device is used to press the second section of the reinforcement element into the stratum of the pile foundation to be reinforced, until all the reinforcement elements according to the second section are pressed into the stratum of the pile foundation to be reinforced by the reaction-force jacking device, so as to obtain the pile foundation to be bonded.

10. The existing pile foundation reinforcement method according to claim 9, characterized in that: The content of fixedly connecting the reinforcement element described in the first section with the reinforcement element described in the second section by means of a connector to implement prestressing includes: Insert the connecting piece into the connecting hole of the reinforcing element of the first section, insert the lower end of the connecting piece into the anchoring cavity of the reinforcing element of the first section, and inject a fixing agent into the anchoring cavity through the liquid injection hole to fix the lower end of the connecting piece; Insert the pre-tightening element through the connecting piece of the reinforcing element described in the first section and embed it into the corresponding groove cavity, install the fastener on the top of the pre-tightening element, and pre-tighten the connecting piece by tightening the fastener; then install the hexagonal threaded connector on the top of the fastener and tighten it; The reinforcing element of the second section is aligned with the connecting hole of the reinforcing element of the first section, and the connecting piece is inserted into the connecting hole of the reinforcing element of the second section, and the lower end of the connecting piece of the reinforcing element of the second section is connected and fixed to the hexagonal threaded connector of the reinforcing element of the first section; The liquid injection hole at the lower end of the reinforcement element described in the second section injects a fixing agent into the corresponding anchor cavity to fix the corresponding connecting piece; the upper end of the connecting piece of the reinforcement element described in the second section is installed with a pre-tightening element, a fastener and a hexagonal threaded connector.

11. The existing pile foundation reinforcement method according to claim 7, characterized in that: An auxiliary positioning element is provided between the reinforcing element and the annular space for arranging the reinforcing element and the pile foundation to be reinforced in the center; and / or the auxiliary positioning element is a thin-walled steel structure in the shape of an arch bridge.

Images