Hidden anchor head device

Abstract

The utility model relates to the technical field of foundation pit supporting, and discloses a hidden anchor head device which comprises a supporting pile and a prefabricated anchorage device, the supporting pile comprises a reinforcement cage, the prefabricated anchorage device comprises a shell used for being embedded into the supporting pile to form a reserved anchor head space, the shell is composed of a bottom plate and a plurality of side plates, and the bottom plate is fixedly connected with the foundation pit side of the reinforcement cage. The side plates are fixedly arranged on the bottom plate and attached to the inner wall of the foundation pit. During on-site construction, the shell is pre-embedded in the pile body, and after the support pile is cast and formed, the anchor head is completely embedded in the support pile body, so that a convex structure formed by a traditional external anchor head is solved, a fertilizer groove filling layer is reduced, the amount of excavated earth and stones of a foundation pit is saved, the later pre-paving waterproof construction procedure is optimized, and the environment is protected, and energy conservation and low carbon are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit support, in particular to a hidden anchor head device. Background Art

[0002] In the application of anchor-type pile-sheet retaining wall support structure engineering using prestressed reinforcement, support piles are usually constructed first, and longitudinal reinforcement (111), stirrups (112) and stiffening reinforcement (113) are made into the following Figure 4 The steel cage shown in the figure is hoisted into the drilled hole of the supporting pile, and the supporting pile is poured and cured to complete the production of the supporting pile. Then, the prestressed tendons are applied according to the progress of the excavation of the stratum in front of the pile, and the tensioning and locking of the post-tensioned prestressed tendons are achieved by setting exposed anchor heads on the supporting piles.

[0003] There are two common methods for setting anchor heads: one is to roughen the outer part of the support pile and implant steel bars, then install a localized compressive indirect steel mesh in conjunction with the anchor, formwork and cast the reinforced concrete anchor head, and then tension and lock the prestressed tendons after the concrete reaches the required strength. The other is to partially grind off the outer protective layer of the support pile to form a flat joint surface, weld the prefabricated steel structure anchor to the vertical reinforcement of the support pile, then pour plain concrete into the steel anchor head, and finally tension and lock the prestressed tendons. Both of these common methods form an anchor head with a horizontal projection of 400 to 500 mm protruding from the pile surface at the prestressed tendon tensioning area on the outer side of the support pile.

[0004] The temporary anchor-type pile-sheet wall support structure using the above commonly used anchor head method has the following disadvantages in actual engineering applications:

[0005] 1) The protruding anchor head increases the distance between the side wall of the foundation pit and the outer contour of the structure, increasing the amount of excavation and backfill of the foundation pit;

[0006] 2) The side walls of the foundation pit form continuous concave and convex surfaces, which makes it impossible to simply level the surface of the foundation pit and then pre-lay the waterproof membrane with the "external protection and internal pasting" method. It is necessary to backfill the fertilizer trough first and then pre-lay the waterproof membrane. In order to adopt the "external protection and external pasting" waterproof construction method, it not only affects the on-site construction progress, but also requires further increasing the distance between the side walls of the foundation pit and the outer contour of the structure, resulting in an increase in the amount of earthwork. Utility Model Content

[0007] The utility model aims to provide a hidden anchor head device to reduce the excavation of foundation pit and reduce the amount of earthwork.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a hidden anchor head device, including a supporting pile and a prefabricated anchor, the supporting pile includes a steel cage, the prefabricated anchor includes a shell for forming a reserved anchor head space embedded in the supporting pile, the shell includes a bottom plate and several side plates, the bottom plate is fixedly connected to the side of the steel cage foundation pit, and the side plates are fixedly arranged on the bottom plate and fit with the inner wall of the foundation pit.

[0009] The construction method of this scheme is:

[0010] 1. Insert the outer shell into the corresponding position of the steel cage to complete the support pile drilling construction;

[0011] 2. Place the steel cage into the support pile drill hole, make the side plate fit the inner wall of the foundation pit, and pour concrete;

[0012] 3. After the foundation pit is excavated to the appropriate elevation, a drilling machine is used to drill anchor holes in the rock and soil layer outside the foundation pit on the bottom plate. Subsequently, prestressed reinforcement is arranged, anchor bodies are grouted, and anti-corrosion materials are sealed in the anchor holes to prepare for the tensioning and locking of the prestressed reinforcement.

[0013] 4. Each bundle of prestressed tendons is passed through the anchor plate and clips are installed. Then the prestressed tendons are tensioned and locked to form a temporary support prestressed tendon anchor head for a stable load-bearing system;

[0014] 5. Hang a mesh to spray concrete or cast concrete panels on the side wall of the foundation pit, and at the same time seal and smooth the anchor heads embedded in the support piles to form a flat side wall of the foundation pit.

[0015] The beneficial effects of this program are:

[0016] 1. The shell is embedded in the pile body. After forming, the anchor head is completely embedded in the supporting pile body, thus solving the convex structure formed by the traditional external anchor head, thereby eliminating the fertilizer trough filling layer, reducing foundation pit excavation, protecting the environment, and being green, energy-saving and low-carbon. 2. In the existing technology, in order to facilitate operation, drilling and installation of the shell, it is usually adopted to drill holes first and then install the shell. The shell does not need to consider the passability of the drill tool. This has become a common practice. However, in this solution, in order to reduce excavation, the opposite is done and the construction process is changed. The shell is embedded in the pile body in advance, and the anchor hole is drilled later. Therefore, the shell needs to consider the passability of the drill tool, and a drilling port is set on the shell in advance for the drill rig to pass through and then drill.

[0017] 3. In this solution, before pouring the pile body, the side plates are fixed on the bottom plate and fit against the inner wall of the foundation pit, which can prevent concrete from flowing into the reserved anchor head space, so that fillers can be filled into the reserved anchor head space. After pouring the pile body, it is easy to clean the concrete that accidentally flows into the operating cavity.

[0018] Furthermore, an opening is reserved on the bottom plate for the anchor cable to pass through, and the diameter of the opening is adapted to the drilling tool.

[0019] Furthermore, it also includes a sealing member for sealing the opening, and the sealing member is detachably connected to the bottom plate.

[0020] Beneficial effect: By pre-setting the opening and setting a detachable seal at the opening, it is possible to prevent concrete from entering the reserved anchor head space during the pouring process. After the pouring is completed, the seal can be removed to avoid the replacement of the drilling tool and improve construction efficiency.

[0021] Furthermore, the side panels include two groups of first side panels and second side panels, and the first side panels are perpendicular to the second side panels.

[0022] Beneficial effect: The first side plate and the second side plate are perpendicular to each other and can provide certain support to each other, thereby improving the integrity of the shell and avoiding offset between the side plate and the bottom plate during pouring, which causes deformation of the shell and affects the use of the reserved anchor head space.

[0023] Furthermore, the housing further includes a supporting rib, which is fixed to the bottom plate on the side of the opening and fixedly connected to the first side plate.

[0024] Beneficial effect: By setting the supporting ribs, the bending resistance of the first side plate is further enhanced, and the probability of deformation of the shell is reduced.

[0025] Furthermore, two supporting ribs are provided, and the two supporting ribs are symmetrically arranged with the vertical axis of the opening of the bottom plate of the shell as the center line.

[0026] Beneficial effects: The symmetrically arranged support ribs can improve the stability of the overall structure and reduce deformation or damage caused by uneven force; at the same time, the symmetrically arranged support ribs help to evenly distribute the weight, ensuring that the device is more stable when bearing loads.

[0027] Furthermore, the prefabricated anchor also includes an anchor plate, a tenon is provided between the supporting rib plate and the prestressed tendon anchor plate, and the anchor plate and the supporting rib plate are connected by mortise and tenon joints.

[0028] Beneficial effects: 1. The mortise and tenon connection can improve the stability of the overall structure, ensuring that the anchor structure is more stable when bearing the tension of the prestressed tendons; 2. The design of the tenon and mortise and tenon connection enhances the shear resistance between the anchor plate and the supporting ribs, thereby improving the rigidity and durability of the overall structure; 3. The mortise and tenon connection simplifies the installation process, facilitates rapid on-site assembly, and reduces installation time and labor costs.

[0029] Furthermore, the shell is made of steel, and the bottom plate, the first side plate, the second side plate and the contact edges of the ribs are all connected by welding.

[0030] Beneficial effects: Steel material has high strength and rigidity. Connecting the components together by welding can ensure the strength of the connection parts and improve the firmness of the overall structure.

[0031] Furthermore, the dimensions of the tenon are 40 to 50 mm in length and 10 mm in depth.

[0032] Beneficial effects: By further limiting the size of the tenon, the stability of the mortise and tenon connection and the strength of the connection part are ensured, the reliability of the mortise and tenon connection is improved, and a reliable connection between the prestressed reinforcement and the anchor is ensured.

[0033] Furthermore, the steel cage includes longitudinal bars, stirrups, stiffening bars and reinforcing bars, and the bottom plate is fixedly connected to the reinforcing bars.

[0034] Beneficial effects: By welding the bottom plate to the reinforcement bars, the connection strength between the bottom plate and the steel cage is enhanced, and the stability of the overall structure is improved; the shell can effectively resist the buoyancy generated by liquid concrete, avoiding problems such as the shell floating during the pouring process. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a front elevation view of the steel structure anchor according to an embodiment of the present utility model;

[0036] Figure 2 for Figure 1 Cross-sectional view at AA in the middle;

[0037] Figure 3 for Figure 2 Cross-sectional view at the middle BB;

[0038] Figure 4 It is a structural diagram of the steel cage mentioned in the background technology;

[0039] Figure 5 A schematic structural diagram of a steel cage in Example 2 of the present invention. DETAILED DESCRIPTION

[0040] The following is further described in detail through specific implementation methods:

[0041] The figure marks in the drawings of the specification include: support pile 1, steel cage 11, longitudinal reinforcement 111, stiffening reinforcement 112, stirrups 113, reinforcing steel bars 114, anchor hole 12, bottom plate 21, opening 211, first side plate 221, second side plate 222, supporting rib 23, and tenon 231.

[0042] Example 1

[0043] Example 1 is basically as shown in the attached Figure 1-3 As shown, Figure 1-3A hidden anchor head device is shown, comprising a prefabricated anchor and a support pile 1, the prefabricated anchor comprising an outer shell, a seal, an anchor plate, prestressed tendons and a clip, the outer shell comprising a bottom plate 21, two first side plates 221, a second side plate 222 and a reinforcing rib, the first side plate 221 and the second side plate 222 are welded to the bottom plate 21 and enclosed into a box-like structure with one side open, which is used to form a reserved anchor head space embedded in the support pile 1, an opening 211 is provided on the bottom plate 21, and the bottom surfaces of the two supporting ribs 23 are symmetrically welded to the bottom plate 21 with the vertical axis of the opening of the bottom plate 21 of the outer shell as the center line, and are welded to the first side plate 221 on both sides, the top surface of the supporting rib 23 is provided with two tenons 231, and the anchor plate is provided with a mortise and tenon matching the tenon 231.

[0044] When the support pile 1 is poured, the seal is bonded or clamped to the bottom plate 21 around the opening, such as Figure 2 、 Figure 3 As shown, the free ends of the first side plate 221 and the second side plate 222 are in contact with the inner wall of the foundation pit to prevent concrete from entering the reserved anchor head space through the opening when pouring the supporting structure.

[0045] The support pile 1 includes a steel cage 11 and concrete. The steel cage 11 includes longitudinal bars 111, stiffening bars 112 and stirrups 113. When making the steel cage 11, first make the longitudinal bars 111, stiffening bars 112 and stirrups 113 into the following shapes: Figure 4 The steel cage 11 shown is welded with the outer shell to the stirrups 113 through the bottom plate 21 and the stiffeners 112 in contact with the outer shell are welded to the outside of the first side plate 221 or the second side plate 222, so that the outer shell is embedded in the prestressed anchor position specified in the design of the steel cage 11.

[0046] In this embodiment, the bottom plate 21, the first side plate 221, the second side plate 222 and the reinforcing ribs are all made of 20 mm thick Q235B steel plates, which are welded by full penetration groove welding. A hole with a diameter of 200 mm is left on the surface of the bottom plate 21. Before pouring concrete into the support pile 1, the hole is sealed with a seal made of a plastic plate to avoid the concrete clogging the reserved anchor head space when pouring concrete into the support pile 1, so as to facilitate the subsequent drilling equipment to pass through the bottom plate 21 to form a hole in the rock and soil layer.

[0047] The supporting ribs are symmetrically arranged with the vertical axis of the opening of the steel shell bottom plate 21 as the center line. The contact edges of the supporting ribs with the bottom plate 21 and the lower contact edges are welded by full-penetration groove welding. The contact edges with the first side plate 221 on both sides can be welded by double-sided fillet welds. The contact surface between the supporting ribs and the prestressed tendon anchor plate is provided with two tenons 231 with a length of 40 to 50 mm and a depth of 10 mm, which are used for temporary limiting during the installation of the anchor plate and for resisting the component force parallel to the contact surface generated by the prestressed tendons.

[0048] The specific implementation process is as follows:

[0049] During the production of the reinforcement cage 11 of the support pile 1, the finished steel structure anchor is embedded in the reinforcement cage 11 according to the prestressed anchor cable position specified in the design, and the anchor and the reinforcement of the support pile 1 are fixed by means of wire tying, electric welding, etc.

[0050] Hoist the finished steel cage 11 into the drilled hole of the support pile, adjust the direction of the steel cage 11 so that the embedded steel structure anchor faces the inner side of the foundation pit, so that the open side of the shell fits with the inner wall of the foundation pit, thereby preventing the poured concrete from entering the shell. After hoisting is completed, pour and maintain the support pile 1.

[0051] After the foundation pit is excavated to a suitable elevation, a drilling machine is used to drill anchor holes 12 in the rock and soil layer outside the foundation pit within the range of the opening 211 of the pre-embedded steel structure anchor base plate 21. Subsequently, prestressed tendons are arranged, anchor bodies are grouted, and anti-corrosion materials are sealed in the anchor holes 12 to prepare for the tensioning and locking of the prestressed tendons.

[0052] Before prestressing, each prestressed tendon is passed through an anchor plate and clips are installed. The anchor plate, through which the prestressed tendons have been passed, is then engaged with the supporting ribs using the reserved mortise and tenon 231. The prestressed tendons are then tensioned and locked, forming a temporary support for the prestressed tendon anchor heads, stabilizing the load-bearing system. Finally, a mesh sprayed concrete or cast-in-place concrete panel is placed on the sidewalls of the foundation pit. During construction, the anchor heads embedded in the support piles 1 are simultaneously sealed and smoothed, forming a smooth foundation pit sidewall. This achieves the goal of reducing the external dimensions of the foundation pit and facilitating the installation of the "external protection, internal adhesion" pre-laid waterproof membrane.

[0053] Example 2

[0054] Example 2 is basically the same as Example 1, except that Figure 5 As shown, the steel cage 11 also includes reinforcing steel bars 114, the first side plate 221 is provided with a through hole for the longitudinal bars 111 to pass through, the longitudinal bars 111 pass through the first side plate 221 and are welded to the first side plate 221, the bottom plate 21 is welded to the reinforcing steel bars 114, the second side plate 222 is welded to the stiffening bars 112, and the first side plate 221 is welded to the stirrups 113 to enhance the connection strength between the outer shell and the steel cage 11, thereby avoiding problems such as the outer shell floating up under the buoyancy of the liquid concrete during the pouring of the support pile 1.

[0055] The above is only an embodiment of the present invention, and common knowledge such as the well-known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that the technical means for solving the problems in the above-mentioned embodiments of the present invention can be used in combination to solve multiple technical problems at the same time. For those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A hidden anchor head device, characterized in that: It includes supporting piles and prefabricated anchors. The supporting piles include a steel cage. The prefabricated anchor includes an outer shell for embedding in the supporting piles to form a reserved anchor head space. The outer shell consists of a bottom plate and several side plates. The bottom plate is fixedly connected to the side of the steel cage foundation pit. The side plates are fixedly arranged on the bottom plate and fit with the inner wall of the foundation pit.

2. A hidden anchor head device according to claim 1, characterized in that: An opening is left on the bottom plate for the anchor cable to pass through, and the diameter of the opening is adapted to the drilling tool.

3. A hidden anchor head device according to claim 2, characterized in that: It also includes a sealing member for sealing the opening, and the sealing member is detachably connected to the bottom plate.

4. A hidden anchor head device according to claim 3, characterized in that: The side panels include two groups of first side panels and second side panels, and the first side panels are perpendicular to the second side panels.

5. A hidden anchor head device according to claim 4, characterized in that: The shell also includes a supporting rib plate, which is fixed on the bottom plate on the side of the opening and fixedly connected to the first side plate.

6. A hidden anchor head device according to claim 5, characterized in that: Two supporting ribs are provided, and the two supporting ribs are symmetrically arranged with the vertical axis of the opening of the bottom plate of the shell as the center line.

7. A hidden anchor head device according to claim 6, characterized in that: The prefabricated anchor also includes an anchor plate, a tenon is provided between the supporting rib plate and the prestressed tendon anchor plate, and the anchor plate and the supporting rib plate are connected by mortise and tenon joints.

8. The hidden anchor head device according to claim 7, characterized in that: The shell is made of steel, and the bottom plate, the first side plate, the second side plate and the contact edges of the ribs are all connected by welding.

9. The hidden anchor head device according to claim 8, characterized in that: The dimensions of the tenon are 40 to 50 mm long and 10 mm deep.

10. A hidden anchor head device according to any one of claims 1 to 9, characterized in that: The steel cage includes longitudinal bars, stirrups, stiffening bars and reinforcing bars, and the bottom plate is fixedly connected to the reinforcing bars.

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