A UHPC sheath for pile foundations and a protective construction method for pile foundations.

Abstract

This invention discloses a UHPC sheath for pile foundations and a protective construction method for pile foundations, relating to the field of building construction equipment technology. A protective component to improve the structural strength of the pile foundation is installed on the outer side of the pile foundation. The protective component is surrounded by a casting mechanism for preparing the protective component by pouring concrete. The casting mechanism includes an inner mold, and two outer molds are symmetrically installed on the outer side of the inner mold. The protective component includes a supporting frame placed between the outer molds and the inner mold, and the supporting frame is surrounded by two layers of steel mesh. The protective component is prepared by pouring concrete slurry using the casting mechanism, and then transported and installed on the outer side of the pile foundation to improve the structural strength of the pile foundation. The UHPC sheath for pile foundations and the protective construction method disclosed in this invention have the effects of high performance, high structural strength, and strong protective capabilities.

Description

Technical Field

[0001] This invention relates to the field of building construction equipment technology, and in particular to a UHPC sheath for pile foundations and a protective construction method for pile foundations. Background Technology

[0002] In construction engineering, pile foundations are a widely used foundation type; however, pile foundations are usually in direct contact with soil or groundwater and are susceptible to corrosion, especially in corrosive environments (such as saline-alkali land, coastal areas, and polluted soil). Because saline-alkali environments contain a certain amount of salt and alkaline substances, the chemical reactions of these substances can corrode the foundation materials, thereby affecting the durability and structural safety of the pile foundation.

[0003] Currently, the main method for post-construction corrosion protection of pile foundations is to install protective plates on the corroded outer surface of the pile foundation and then re-pour concrete. This method is rather cumbersome. Alternatively, UHPC concrete can be used directly to produce the pile foundation. UHPC concrete is composed of cement, silica fume, fine sand, metal fibers or composite organic fibers, high-efficiency water-reducing agents, and water, and has extremely strong corrosion resistance, but it is also costly. Therefore, there is an urgent need for a protective device and method that can be quickly and conveniently constructed on the periphery of the pile foundation to isolate corrosive media and extend the service life of the pile foundation. Summary of the Invention

[0004] This invention discloses a UHPC sheath for pile foundations and a construction method for protecting pile foundations, aiming to solve the technical problems that existing equipment and methods for protecting pile foundations need to be improved in terms of ease of operation, work efficiency, and construction efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A UHPC sheath for pile foundations, wherein the outer side of the pile foundation is provided with protective components to improve the structural strength of the pile foundation;

[0007] The protective component is wrapped with a casting mechanism for casting the protective component. The casting mechanism includes an inner mold and two outer molds are symmetrically installed on the outer side of the inner mold.

[0008] The protective assembly includes a support frame placed between the outer mold and the inner mold sandwich, and the outside of the support frame is wrapped with two layers of steel mesh.

[0009] The protective component is prepared by using the pouring mechanism in conjunction with the pouring of concrete slurry, and then the protective component is transported and installed on the outside of the pile foundation to improve the structural strength of the pile foundation.

[0010] By incorporating a casting mechanism into existing pile foundation protection technology, protective components are prefabricated on-site. These components are then transported and installed onto the outside of the pile foundation. First, the casting mechanism prefabricates the protective components, with the quantity determined by requirements. Second, the protective components installed on the outside of the pile foundation are made of UHPC ultra-high performance concrete. After installation, the connection between the protective components and the pile foundation is reinforced with concrete filling. This provides high-performance protection only to the easily corroded ends of the pile foundation, saving materials while maintaining the protective effect. Furthermore, the reinforcement between the protective components and the pile foundation further improves the protection efficiency and repairs corroded surfaces, significantly enhancing the functionality of the component.

[0011] In a preferred embodiment, a set of bolt holes are symmetrically arranged at the fitting ends of the two outer molds, and high-strength bolts are installed in the internal threads of the bolt holes to fix the two outer molds. Several uniformly distributed through slots are opened through the interior of the inner mold.

[0012] By setting up an outer mold structure that uses bolt holes and high-strength bolts for fixing, and by using the outer mold in conjunction with the inner mold to form a cavity, the machine assists workers in injection molding the protective components, thus ensuring the integrity of the equipment's operation.

[0013] In a preferred embodiment, the outer sides of the supporting frame and the steel mesh are cast with concrete sleeves, and the two ends of the concrete sleeves are reserved with locking openings.

[0014] By setting up a concrete sleeve structure with a built-in support frame, on the one hand, the support frame can improve the compressive strength of the concrete sleeve after it is installed on the outside of the pile foundation. At the same time, the steel mesh wrapped around the outside of the support frame can further reinforce the concrete after the concrete grout solidifies, improving the corrosion resistance and anti-detachment ability of the concrete sleeve. On the other hand, after the protective components are installed using the locking joint, as workers pour UHPC concrete grout between the protective components and the pile foundation, the specially structured support frame extends in a way to cooperate with the concrete grout, which can further improve the connection strength between the protective components and the pile foundation, thereby significantly maintaining the structural strength of the pile foundation.

[0015] In a preferred embodiment, the support frame includes several evenly distributed horizontal reinforcing bars, which are tied together by wire and several vertically distributed longitudinal reinforcing bars. Several evenly distributed inner reinforcing bars are tied to the outside of the horizontal reinforcing bars by wire. The inner reinforcing bars are in a U-shape and are distributed inside the through groove. The inner reinforcing bars are in a U-shape in the horizontal direction and a V-shape in the vertical direction. The inner reinforcing bars are distributed inside the through groove and extend outward from the through groove. Two sets of concrete sleeves close and wrap around the outer surface of the pile foundation. During the closing and wrapping process, the inner reinforcing bars are deformed by the compressive force of the pile foundation.

[0016] By setting the support frame as a structure consisting of interlaced horizontal and vertical reinforcing bars and secured with wire, the structural strength of the concrete sleeve can be maintained. Meanwhile, the additional inner reinforcing bars protrude from the inside of the protective component after the concrete slurry cools and molds. With the installation of the concrete sleeve by workers and the pouring of concrete slurry between the protective component and the pile foundation, the connection strength between the protective component and the pile foundation can be further improved, thereby significantly maintaining the structural strength of the pile foundation. Furthermore, the compressive reaction force between the inner reinforcing bars and the pile foundation will increase the tightness of the concrete sleeve installation.

[0017] In a preferred embodiment, each of the inner buckle bars is fixed to the outside of the connection node between the horizontal and vertical reinforcing bars by wire, and the two ends of the inner buckle bars are respectively distributed crosswise on the upper and lower surfaces of the horizontal reinforcing bars. The inner buckle bars are horizontally inserted from the outside of the two steel meshes and compress and fix the two steel meshes.

[0018] By specializing the installation points of the inner reinforcing bars, on the one hand, the two ends of the inner reinforcing bars are set to be distributed crosswise on the upper and lower surfaces of the transverse reinforcing bars, which can form a cross reinforcement force on the transverse reinforcing bars after the concrete slurry solidifies. On the other hand, the inner reinforcing bars are horizontally inserted from the outside of the two steel meshes, which can form a compressive fixing force on the two steel meshes after the concrete slurry solidifies, thereby greatly improving the overall strength of the concrete sleeve.

[0019] The construction method for protecting pile foundations using UHPC sheaths includes the following steps:

[0020] S1. Place the protective components and inner and outer steel mesh inside the pouring mechanism. Then, use a grouting machine to pour UHPC ultra-high performance concrete into the pouring mechanism. During this process, use a vibrator to vibrate the concrete slurry. After the concrete has solidified, remove the pouring mechanism.

[0021] S2. The finished concrete sleeve is transported to the construction site, and then hoisted to the part to be protected below the pile foundation using hoisting equipment. During the installation process, the inner reinforcing bars are deformed by the compressive force of the pile foundation.

[0022] S3. After installation, use a grouting machine to continue filling and vibrating UHPC ultra-high performance concrete between the concrete sleeve and the pile foundation. After the concrete grout solidifies, the protection construction of the pile foundation is completed.

[0023] The beneficial effects of this application are as follows.

[0024] Firstly, by incorporating a casting mechanism based on existing pile foundation protection technology, and utilizing an outer mold structure fixed with bolt holes and high-strength bolts, the outer mold, in conjunction with the inner mold, forms a cavity, thereby assisting workers in prefabricating the protective components. Subsequently, the protective components are transported and installed on the outside of the pile foundation. The protective components are prefabricated using the casting mechanism, and the quantity can be prepared according to requirements. Unlike traditional disposable protective measures, this equipment can more effectively improve economic efficiency and save costs.

[0025] Secondly, by adding a concrete sleeve structure with an internal support frame, the support frame can improve the compressive strength of the concrete sleeve after it is installed on the outside of the pile foundation. At the same time, the steel mesh wrapped around the outside of the support frame can further reinforce the concrete after the concrete slurry solidifies, improving the corrosion resistance and anti-detachment ability of the concrete sleeve. On the other hand, after the protective component is installed using the locking joint, as workers pour concrete slurry between the protective component and the pile foundation, the specially structured support frame, together with the concrete slurry, can further improve the connection strength between the protective component and the pile foundation, thereby significantly maintaining the structural strength of the pile foundation. At the same time, it can repair the corroded surface of the pile foundation, greatly improving the functionality of this component. Moreover, the protective component is made of UHPC ultra-high performance concrete. By providing high-performance wrapping protection only to the easily corroded parts of the pile foundation, it can save materials while maintaining the protective effect on the pile foundation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure proposed in this invention.

[0027] Figure 2 This is an exploded view of the overall structure proposed in this invention.

[0028] Figure 3 This is a top view of the concrete sleeve after installation according to the present invention.

[0029] Figure 4 This is a cross-sectional view of the concrete sleeve structure proposed in this invention.

[0030] Figure 5 This is an exploded view of the concrete sleeve structure proposed in this invention.

[0031] Figure 6 The present invention proposes Figure 5 Enlarged view of the structure at point A in the middle.

[0032] Figure 7 This is a top view of the installation state of the internal tie rod proposed in this invention.

[0033] Figure 8 This is a schematic diagram of the internal mold structure proposed in this invention.

[0034] Figure 9 The present invention proposes Figure 4 Enlarged structural diagram at point B.

[0035] Figure 10 This is a schematic diagram of the three-dimensional structure of the internal buckle rib proposed in this invention.

[0036] Figure 11 This is a schematic diagram of the main view of the internal buckle structure proposed in this invention.

[0037] Figure 12 This is a top view schematic diagram of the internal buckling rib structure proposed in this invention.

[0038] In the diagram: 1. Pouring mechanism; 101. Outer mold; 102. Bolt opening; 103. High-strength bolt; 104. Inner mold; 1041. Inner hoop component; 105. Through groove; 106. Precast mold; 107. Installation port; 2. Protective components; 201. Support frame; 2011. Horizontal reinforcement; 2012. Longitudinal reinforcement; 2013. Internal reinforcing bar; 202. Steel mesh; 203. Concrete sleeve; 204. Locking opening; 205. Locking bolt. Detailed Implementation

[0039] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0040] Reference Figures 1 to 12 A UHPC sheath for pile foundation and a protective construction method for pile foundation, wherein a protective component 2 for improving the structural strength of the pile foundation is provided on the outside of the pile foundation;

[0041] The protective component 2 is wrapped with a casting mechanism 1 for casting the protective component 2. The casting mechanism 1 includes an inner mold 104 and two outer molds 101 are symmetrically installed on the outside of the inner mold 104.

[0042] The protective component 2 includes a support frame 201 placed between the outer mold 101 and the inner mold 104, and the outer side of the support frame 201 is wrapped with two layers of steel mesh 202.

[0043] The protective component 2 is prepared by using the pouring mechanism 1 in conjunction with the pouring of concrete slurry. The protective component 2 is then transported and installed on the outside of the pile foundation to improve the structural strength of the pile foundation.

[0044] In this embodiment: the worker fixes the pouring mechanism 1 to the top of the machine tool, and places the protective component 2 inside the pouring mechanism 1. Then, UHPC ultra-high performance concrete is introduced into the pouring mechanism 1 through a grouting machine. During this process, the concrete slurry is vibrated with a vibrator. After the concrete has solidified, the pouring mechanism 1 is removed. The finished protective component 2 is then transported to the construction site by a transport equipment. After that, the protective component 2 is hoisted to the part to be protected below the pile foundation by a hoisting equipment for installation. After installation, UHPC ultra-high performance concrete is continued to be filled and vibrated between the protective component 2 and the pile foundation using a grouting machine. After the concrete slurry solidifies, the protection construction of the pile foundation is completed.

[0045] Reference Figures 1 to 2 , Figure 8 In a preferred embodiment, a set of bolt holes 102 are symmetrically arranged at the fitting ends of the two outer molds 101. High-strength bolts 103 are installed in the internal threads of the bolt holes 102 to fix the two outer molds 101. Several uniformly distributed through slots 105 are opened through the interior of the inner mold 104.

[0046] Workers fix the inner mold 104 to the top of the machine tool and place the protective component 2 on the outside of the inner mold 104. Then, they snap the two outer molds 101 onto the outside of the protective component 2 and pass the high-strength bolts 103 through the inside of the bolt holes 102 and tighten them. After completing the installation of the pouring mechanism 1, workers use a grouting machine to pour UHPC ultra-high performance concrete into the gap between the outer molds 101 and the inner mold 104. During this process, the concrete slurry is vibrated with a vibrator. After the concrete has solidified, the above operation is repeated in reverse. The outer molds 101 are then removed, and the finished protective component 2 is transported to the construction site using transport equipment.

[0047] The bottom of both the outer mold 101 and the inner mold 104 are provided with several mounting holes 107, which are fixed to the top of the machine tool. The inner mold 104 is provided with an inner hoop component 1041 to improve the structural strength of the inner mold 104.

[0048] Reference Figures 2 to 7 In a preferred embodiment, a concrete sleeve 203 is cast on the outside of the supporting frame 201 and the steel mesh 202, and locking openings 204 are reserved at both ends of the concrete sleeve 203.

[0049] Workers fix the pouring mechanism 1 to the top of the machine tool, and place the support frame 201 and steel mesh 202 inside the pouring mechanism 1. Then, UHPC ultra-high performance concrete is poured into the pouring mechanism 1 using a grouting machine. During this process, the concrete slurry is vibrated with a vibrator. After the concrete has solidified, the pouring mechanism 1 is removed. At this point, the concrete forms a concrete sleeve 203 and wraps around the outside of the support frame 201 and steel mesh 202. Workers then use a transport device to move the finished protective component 2 to the construction site. After that, the concrete sleeve 203 is hoisted to the part to be protected below the pile foundation using a hoisting device for installation. After installation, the UHPC ultra-high performance concrete is continued to be filled and vibrated between the protective component 2 and the pile foundation using a grouting machine. After the concrete slurry solidifies, the protective construction of the pile foundation is completed.

[0050] It is worth noting that the steel mesh 202 is a dense mesh with an aperture of ≤5mm, which can effectively prevent the poured concrete from seeping out from the channel 105.

[0051] Among them, the locking bolt 205 is installed on the outer thread of the locking port 204. The locking bolt 205 is inserted into the locking port 204, and the two protective components 2 are fixedly installed on the outer surface of the pile foundation by using an electric wrench in a diagonal connection manner.

[0052] Furthermore, a row of prefabricated molds 106 are symmetrically arranged on the outer surface of the inner mold 104, and a row of protrusions are symmetrically arranged on the outer surface of the prefabricated molds 106. The locking opening 204 is prefabricated by the protrusions of the prefabricated molds 106.

[0053] Reference Figure 1 and Figure 3 In a preferred embodiment, the support frame 201 includes a plurality of evenly distributed horizontal ribs 2011. The horizontal ribs 2011 are tied and fixed together by wire and a plurality of vertically distributed longitudinal ribs 2012. A plurality of evenly distributed inner ribs 2013 are tied and fixed to the outside of the horizontal ribs 2011 by wire. The inner ribs 2013 are distributed inside the through groove 105 and extend outward from the position of the through groove 105.

[0054] Workers poured concrete grout, causing the transverse reinforcing bars 2011, longitudinal reinforcing bars 2012, and inner reinforcing bars 2013 inside the supporting frame 201 to be encased. After the concrete solidified, a concrete sleeve 203 was formed, at which point the inner reinforcing bars 2013 appeared to extend through the interior of the concrete sleeve 203. Figure 9As shown, the concrete sleeve 203 is hoisted to the part to be protected below the pile foundation by hoisting equipment and installed. After installation, UHPC ultra-high performance concrete is continuously filled and vibrated between the protective component 2 and the pile foundation by grouting machine. After the concrete grout solidifies, the exposed inner reinforcing bars 2013 will be distributed in the gap between the protective component 2 and the pile foundation, thereby improving the connection strength at the gap and completing the protection construction of the pile foundation.

[0055] It is worth noting that, such as Figure 3 , Figure 7 , Figures 9 to 12 As shown, the inner reinforcing bar 2013 has a "U" shape in the horizontal direction and a "V" shape in the vertical direction. The advantage of this cross design is that it can improve the shear force of concrete in both the horizontal and vertical directions, thereby increasing the structural strength after casting.

[0056] Furthermore, during the process of the two sets of concrete sleeves 203 being closed and wrapped around the outer surface of the pile foundation by the locking bolts 205, the inner reinforcing bars 2013 are deformed by the compressive force of the pile foundation, causing the "V"-shaped structure to further expand (such as...). Figure 3 As shown in the figure, the reaction force generated by the inner retaining rib 2013 during this process will increase the locking tightness of the locking bolt 205, prevent it from loosening, and ensure the installation firmness of the concrete sleeve 203.

[0057] Specifically, each inner rib 2013 is fixed to the outside of the connection node between the horizontal rib 2011 and the vertical rib 2012 by wire binding. The two ends of the inner rib 2013 are respectively crossed and clamped to the upper and lower surfaces of the horizontal rib 2011 to improve the stability of the horizontal rib 2011. The inner rib 2013 is inserted horizontally from the outside of the two steel meshes 202, which can effectively improve the firmness between the two steel meshes 202 and the horizontal ribs 2011 and the vertical ribs 2012.

[0058] Working principle: During use, the worker fixes the inner mold 104 to the top of the machine tool, and places the support frame 201 and steel mesh 202 on the outside of the inner mold 104. Then, the two outer molds 101 are snapped onto the outside of the protective component 2. At the same time, the high-strength bolts 103 are passed through the inside of the bolt holes 102 and tightened. After the installation of the pouring mechanism 1 is completed, the worker uses a grouting machine to pour UHPC ultra-high performance concrete into the gap between the outer mold 101 and the inner mold 104. During this process, the concrete slurry is vibrated with a vibrator, causing the transverse reinforcing bars 2011, longitudinal reinforcing bars 2012 and inner reinforcing bars 2013 inside the support frame 201 to be wrapped. After the concrete solidifies, a concrete sleeve 203 is formed. At this time, the inner reinforcing bars 2013 will penetrate out from the inside of the concrete sleeve 203. After the concrete has solidified, the above operation is repeated in reverse. The outer mold 101 is removed, and the finished protective component 2 is transported to the construction site using transport equipment. Then, the concrete sleeve 203 is hoisted to the part to be protected below the pile foundation using hoisting equipment. Locking bolts 205 are inserted through locking holes 204 to install the concrete sleeve 203. After installation, UHPC ultra-high performance concrete is continuously filled and vibrated between the concrete sleeve 203 and the pile foundation using a grouting machine. After the concrete grout solidifies, the concrete sleeve 203 will be firmly fixed to the outer surface of the pile foundation, thus protecting the pile foundation. Since the concrete sleeve 203 is made of UHPC ultra-high performance concrete, the corrosion resistance of the pile foundation is greatly enhanced, and the efficiency of the entire construction is effectively improved and the cost is effectively reduced.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A UHPC jacket for a pile foundation, characterized in that, The application relates to a protective component (2) for improving the structural strength of a pile foundation and a steel mesh (202) and a concrete sleeve (203) arranged outside the pile foundation. The protective component (2) comprises a supporting framework (201), and the outer side of the supporting framework (201) is wrapped with two layers of steel meshes (202). The outer side of the supporting framework (201) and the steel meshes (202) is formed with a concrete sleeve (203), and the concrete sleeve (203) is made of UHPC material. The supporting framework (201) comprises a plurality of uniformly distributed horizontal rib members (2011), the horizontal rib members (2011) are fixed by iron wires and a plurality of vertically distributed longitudinal rib members (2012), the outer side of the horizontal rib members (2011) is fixed with a plurality of uniformly distributed inner buckling ribs (2013) by iron wires, the inner buckling ribs (2013) are in a "U" structure in the horizontal direction, the inner buckling ribs (2013) are in a "V" structure in the vertical direction, two groups of the UHPC sleeves are wrapped on the outer surface of the pile foundation, and the inner buckling ribs (2013) are deformed under the extrusion force of the pile foundation during the wrapping process. Each inner buckling rib (2013) is fixed to the outer side of the connecting nodes of the horizontal rib member (2011) and the longitudinal rib member (2012) by iron wires, and the two ends of the inner buckling rib (2013) are cross-distributed on the upper and lower surfaces of the horizontal rib member (2011) respectively. The inner buckling rib (2013) is horizontally inserted from the outer side of the two steel meshes (202) and forms extrusion fixation on the two steel meshes (202), and extends out from the outer surface of the concrete sleeve (203).

2. A UHPC jacket for a pile foundation according to claim 1, characterized in that The two ends of the concrete sleeve (203) are provided with locking openings (204).

3. A UHPC jacket for a pile foundation according to claim 2, characterized in that The outer side of the locking opening (204) is provided with a locking bolt (205) in a threaded mode, and the two UHPC sleeves are fixed and installed in a fit mode.

4. A method of protecting a pile foundation using the UHPC jacket according to claim 1, characterized in that, The application comprises the following steps: S1, placing the protective component (2) and the two layers of steel meshes (202) in the inside of a pouring mechanism (1), then introducing UHPC super high performance concrete into the inside of the pouring mechanism (1) by means of a grouting machine, vibrating the concrete slurry by means of a vibrating rod during the process, and removing the pouring mechanism (1) after the concrete solidifies; S2, transporting the finished UHPC sleeve to a construction site, then hoisting the UHPC sleeve to the position to be protected below the pile foundation by means of hoisting equipment, and deforming the inner buckling rib (2013) under the extrusion force of the pile foundation during the installation process; S3, filling and vibrating UHPC super high performance concrete between the UHPC sleeve and the pile foundation by means of the grouting machine after installation, and completing the protection construction of the pile foundation after the concrete slurry solidifies.

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