Counterfort device capable of adjusting thickness of protective layer of pile foundation reinforcement cage

Abstract

The utility model relates to the technical field of pile foundation construction, in particular to a buttress device capable of adjusting the thickness of a protection layer of a pile foundation reinforcement cage. The buttress device comprises a buttress frame and a buttress wheel; the buttress comprises an adjusting assembly and a connecting cross rod, the two ends of the connecting cross rod are connected with the adjusting assembly, and the buttress wheel is rotationally installed on the connecting cross rod; the adjusting assembly comprises a connecting vertical rod and a connecting inclined rod, the connecting vertical rod is parallel to the main reinforcement, the radial outer end of the connecting inclined rod is hinged to the end of the connecting vertical rod, and the radial inner end of the connecting inclined rod is in sliding connection with the main reinforcement of the reinforcement cage in the vertical direction. According to the utility model, the radial movement function of the buttress wheel can be realized, the thickness of a protective layer can be adjusted, and the buttress wheel is suitable for different requirements on the thickness of the protective layer.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation construction, in particular to a buttress device capable of adjusting the thickness of a pile foundation steel cage protective layer. Background Art

[0002] Bored piles are becoming more and more popular in the construction of bridges and other projects because of their advantages such as low construction noise and vibration, wide application range, ability to meet some special needs, and ability to build pile foundations with much larger diameters than precast piles.

[0003] The concrete protective layer can protect the steel bars from rust, bond and anchor the steel bars, and transfer the force to the concrete. Therefore, in the process of bored pile construction, it is particularly important to control the thickness and quality of the concrete protective layer.

[0004] During the process of lowering the steel cage of bored piles, due to the heavy weight and long length of the steel cage, as well as factors such as construction workers, machinery, and drilling quality, it is difficult to accurately locate the position of the steel cage after it is lowered to the drill hole, thereby failing to ensure the uniformity and effectiveness of the thickness of the concrete cover. In the prior art, the purpose of controlling the thickness of the cover is achieved by installing buttress blocks on the steel cage, but this cannot be used when the thickness of the cover varies. Utility Model Content

[0005] In view of the deficiencies in the prior art, an object of the embodiments of the utility model is to provide a buttress device capable of adjusting the thickness of the protective layer of the pile foundation reinforcement cage.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] A buttress device capable of adjusting the thickness of a protective layer of a pile foundation steel cage is installed on the main reinforcement of the steel cage, the buttress device comprises a buttress frame and a buttress wheel; the buttress frame comprises an adjustment component and a connecting cross bar, both ends of the connecting cross bar are connected to the adjustment component, and the buttress wheel is rotatably installed on the connecting cross bar; the adjustment component comprises a connecting vertical bar and a connecting oblique bar, the connecting vertical bar is parallel to the main reinforcement, the radial outer end of the connecting oblique bar is hinged to the end of the connecting vertical bar, and the radial inner end of the connecting oblique bar is vertically slidably connected to the main reinforcement of the steel cage.

[0008] Optionally, the connecting cross bar is located radially outside the steel cage, and the connecting cross bar is arc-shaped, and the curvature of the connecting cross bar matches the curvature of the steel cage.

[0009] Optionally, the buttress wheel is a disc-shaped structure, the buttress wheel has a center hole, the diameter of the center hole is larger than the diameter of the connecting cross bar, and the center hole of the buttress wheel is sleeved on the connecting cross bar.

[0010] Optionally, both ends of the connecting cross bar are respectively connected to connecting vertical bars of the adjustment assembly, and the connecting cross bar is fixedly connected to the connecting vertical bar.

[0011] Optionally, the upper and lower ends of the connecting vertical rods are respectively connected to a group of connecting oblique rods, each group of connecting oblique rods forms a triangle with the main reinforcement, and the ends of the connecting vertical rods are located at the apex angles of the radial outer ends of the triangle.

[0012] Optionally, each group of connecting oblique rods has two connecting oblique rods, the radial outer ends of the two connecting oblique rods are connected to one end of the connecting vertical rod, and the radial inner ends of the two connecting oblique rods are connected to different vertical positions of the main reinforcement.

[0013] Optionally, the end of the connecting vertical rod has a fork ear, a groove is formed in the middle of the fork ear, and the radial outer end of the connecting oblique rod has an ear, the ear is inserted into the groove of the fork ear, and is rotatably connected through a pin shaft.

[0014] Optionally, each group of connecting oblique rods is fixed to the main reinforcement by a pair of clips, and an arc-shaped plate is provided at the radial inner end of the connecting oblique rods. The clips have a slot, and the clips are sleeved on the main reinforcement with two open slots arranged opposite to each other. The clips press the arc-shaped plate against the main reinforcement and lock it.

[0015] Optionally, the connecting horizontal rods, connecting vertical rods and connecting diagonal rods are all made of steel bars, and the buttress wheels are concrete wheels.

[0016] Optionally, at least two groups of buttress devices are arranged along the axial direction of the steel cage, and at least four buttress devices are arranged in each group.

[0017] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0018] For steel cages with different diameters, the required protective layer thickness is generally different. The buttress device installs the connecting vertical rod to the main reinforcement of the steel cage through the connecting diagonal rod, overlaps a connecting cross rod between the connecting vertical rods, and installs the buttress wheel on the connecting cross rod. Since the outer end of the connecting diagonal rod is hinged to the connecting vertical rod, the inner end of the connecting diagonal rod is slidably installed on the main reinforcement, and the radial distance between the connecting vertical rod and the main reinforcement of the steel cage can be adjusted by moving the connecting diagonal rod and the connection point of the main reinforcement of the steel cage up and down, realizing the radial movement function of the buttress wheel, and then realizing the adjustment of the thickness of the protective layer. It is suitable for situations with different requirements for the thickness of the protective layer. At the same time, it can control the thickness of the protective layer of the steel cage to be uniform and effective, easy to implement, and can ensure the verticality of the steel cage.

[0019] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 It is an overall schematic diagram of the buttress device provided by the embodiment of the utility model;

[0022] Figure 2 This is a cross-sectional view of the buttress wheel in the diameter direction provided by the embodiment of the utility model;

[0023] Figure 3 It is a cross-sectional view in the thickness direction of the buttress wheel provided by an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the connection between the buttress wheel and the connecting cross bar provided in an embodiment of the utility model;

[0025] Figure 5 It is a schematic diagram of the buttress wheel provided in the embodiment of the utility model installed on the buttress frame;

[0026] Figure 6 This is a schematic diagram of a first state of a buttress frame provided by an embodiment of the utility model;

[0027] Figure 7 This is a schematic diagram of the second state of the buttress frame provided by the embodiment of the utility model;

[0028] Figure 8 This is a schematic diagram of connecting vertical rods and connecting diagonal rods provided by an embodiment of the utility model;

[0029] Fig. 9 It is a side view of the connection vertical rod and the connection diagonal rod provided by the embodiment of the utility model;

[0030] Fig.10 This is a schematic diagram of connecting the diagonal rod and the main reinforcement provided by the embodiment of the utility model;

[0031] Fig.11 It is an exploded schematic diagram of the connecting inclined rod and the buckle provided in the embodiment of the utility model;

[0032] Fig.12 It is a schematic diagram of a top view of a curved plate provided by an embodiment of the utility model;

[0033] Fig.13 It is a schematic diagram of a side view of the installation of a steel cage provided by an embodiment of the utility model;

[0034] Fig.14 It is a schematic diagram of a top view of the steel cage installation provided by an embodiment of the utility model;

[0035] In the figure: 1, buttress wheel; 2, connecting horizontal rod; 3, connecting diagonal rod; 4, connecting vertical rod; 5, main reinforcement; 6, hole wall; 7, hole bottom; 8, ground; 9, reinforcement cage;

[0036] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0037] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Glossary:

[0039] The thickness of the protective layer of the cast-in-place pile reinforcement cage refers to the distance from the outer edge of the outermost reinforcement of the reinforcement cage to the concrete surface. According to Article 8.2.1 of the Code for Design of Concrete Structures (GB 50010-2010 2015 Edition), the required thickness of the concrete protective layer is different for the corrosive environment of different strata, as shown in Table 1. Therefore, it is particularly important to achieve adjustable control of the protective layer thickness.

[0040] Table 1 Minimum thickness of concrete cover C (mm)

[0041] Environmental category Plate, wall, shell Beams, columns, rods one 15 20 Two a 20 25 2b 25 35 Three A 30 40 Three B 40 50

[0042] like Figure 1 As shown, in one embodiment of the utility model, a buttress device with adjustable thickness of the protective layer of the pile foundation steel cage is proposed, which is installed on the main reinforcement 5 of the steel cage 9, and the buttress device includes a buttress frame and a buttress wheel 1; the buttress frame includes an adjustment component and a connecting cross bar 2, both ends of the connecting cross bar 2 are connected to the adjustment component, and the buttress wheel 1 is rotatably installed on the connecting cross bar 2; the adjustment component includes a connecting vertical rod 4 and a connecting oblique rod 3, the connecting vertical rod 4 is parallel to the main reinforcement 5, the radial outer end of the connecting oblique rod 3 is hinged to the end of the connecting vertical rod 4, and the radial inner end of the connecting oblique rod 3 is vertically slidably connected to the main reinforcement 5 of the steel cage 9.

[0043] In the buttress device, the connecting cross bar 2 is connected to the connecting vertical bar 4, and the two ends of the connecting vertical bar 4 are connected to the connecting diagonal bar 3 through a hinge connection. The connecting diagonal bar 3 is slidably connected to the main reinforcement 5 of the steel cage 9, which is easy to install.

[0044] For steel cages 9 of different diameters, the required protective layer thickness is generally different. The buttress device installs the connecting vertical rod 4 on the main reinforcement 5 of the steel cage 9 through the connecting diagonal rod 3, overlaps a connecting cross rod 2 between the connecting vertical rods 4, and installs the buttress wheel 1 on the connecting cross rod 2. Since the outer end of the connecting diagonal rod 3 is hinged to the connecting vertical rod 4, the inner end of the connecting diagonal rod 3 is slidably installed on the main reinforcement 5, and the radial distance between the connecting vertical rod 4 and the main reinforcement 5 can be adjusted by moving the connecting diagonal rod 3 and the main reinforcement 5 of the steel cage 9 up and down, thereby adjusting the thickness of the protective layer. It is suitable for situations where there are different requirements for the thickness of the protective layer. At the same time, it can control the thickness of the protective layer of the steel cage to be uniform and effective, easy to implement, and can ensure the verticality of the steel cage 9.

[0045] The connecting cross bar 2 is located radially outside the steel cage 9, and the connecting cross bar 2 is arc-shaped, and the curvature of the connecting cross bar 2 matches the curvature of the steel cage 9. The two ends of the connecting cross bar 2 are respectively connected to the connecting vertical bars 4 of the adjustment assembly, and the connecting cross bar 2 is fixedly connected to the connecting vertical bars 4. Figure 1 , Fig.14 As shown, the connecting cross bar 2 is in an arc shape, and its curvature is substantially consistent with that of the steel cage 9 , and its two ends are welded to the midpoint of the connecting vertical bar 4 .

[0046] like Figure 2 , Figure 3 As shown, the buttress wheel 1 is a disc-shaped structure, and the buttress wheel 1 has a center hole, the diameter of the center hole is larger than the diameter of the connecting cross bar 2, and the center hole of the buttress wheel 1 is sleeved on the connecting cross bar 2, as shown in FIG. Figure 4 , Figure 5 The buttress wheel 1 is placed on the connecting cross bar 2 through the center hole of the buttress wheel 1, and it is ensured that the buttress wheel 1 can rotate freely around the connecting cross bar 2.

[0047] The buttress wheel 1 is a concrete structure, and its grade should not be lower than C25. The buttress wheel 1 is circular, with a thickness of about 20 mm and a diameter of 80 mm, which is slightly smaller than the protective layer thickness required by the pile foundation steel cage 9. There is a circular hole in the center, with a hole diameter of 15 mm, which is slightly larger than the diameter of the connecting cross bar 2. The connecting cross bar 2, the connecting diagonal bar 3 and the connecting vertical bar 4 are made of the same type of steel bars, and their diameters are slightly smaller than the center hole of the buttress wheel 1.

[0048] like Figure 6 As shown, the upper and lower ends of the connecting vertical rod 4 are respectively connected to a group of connecting diagonal rods 3, each group of connecting diagonal rods 3 and the main reinforcement 5 form a triangle, and the end of the connecting vertical rod 4 is located at the vertex of the radial outer end of the triangle. Specifically, each group of connecting diagonal rods 3 has two, the radial outer ends of the two connecting diagonal rods 3 are connected to one end of the connecting vertical rod 4, and the radial inner ends of the two connecting diagonal rods 3 are connected to different vertical positions of the main reinforcement 5. By moving the connecting diagonal rods 3 and the main reinforcement 5 of the steel cage 9 up and down, for example, Figure 6 Move point b to Figure 7 b` to adjust the thickness of the protective layer.

[0049] The connecting vertical rod 4 has hinges at both ends, and is connected to the connecting diagonal rod 3 through the welded hinges (fork ears). Figure 8 , Fig. 9 As shown, the end of the connecting vertical rod 4 has a fork ear, and a groove is formed in the middle of the fork ear. The radial outer end of the connecting diagonal rod 3 has an ear, and the ear is inserted into the groove of the fork ear and is rotatably connected through a pin shaft.

[0050] The connecting diagonal rod 3 has a hinge (ear) welded on one end, and the other end is rotated to connect the arc-shaped iron plate, so that the arc-shaped iron plate and the connecting diagonal rod can produce a certain angle change, so as to adjust the vertical position of the arc-shaped iron plate to keep it in close contact with the main reinforcement. The welded hinge end is connected to the connecting vertical rod 4, and the two ends of the connecting vertical rod 4 are connected to the connecting diagonal rod 3 through a hinge. The other end of the connecting diagonal rod 3 is connected to the main reinforcement 5 of the steel cage through a snap connection, and the buttress device is fixed on the steel cage 9. Specifically, as Fig.10 , Fig.11 , Fig.12 As shown, each group of connecting oblique rods 3 is fixed on the main reinforcement 5 by a pair of buckles. The radial inner end of the connecting oblique rod 3 is provided with an arc plate. The buckle has a slot. The buckle is sleeved on the main reinforcement 5 and the two open slots are arranged opposite to each other. In each pair of buckles, the upper buckle slot is downward and the lower buckle slot is upward. When connecting, the connecting oblique rod 3 is inserted into the slot, and the buckle presses the arc plate tightly against the main reinforcement 5 and locks it.

[0051] At least two groups of buttress devices are arranged along the axial direction of the steel cage 9, and at least four buttress devices are arranged in each group. Fig.13 As shown, a steel cage 9 is installed between the ground 8 and the hole bottom 7, and the buttress wheel 1 is located in the hole wall 6. A certain number of buttress devices are installed in sections around the steel cage 9 to control the thickness (L) of the buttress layer.

[0052] The buttress devices are symmetrically arranged on the steel cage 9, and each group of buttress devices is placed on the same horizontal plane. According to the different diameters of the steel cage 9, multiple buttress devices are installed at the same place in a symmetrical shape, with a spacing of equally divided steel cage 9 cross-section circle positions. The specific number of buttress devices installed is shown in Table 2. Fig.13 , Fig.14 The following description will be given by taking the installation of 4 buttress devices in each group as an example.

[0053] Table 2 Correspondence between the diameter of the steel cage and the number of buttress devices installed in each group

[0054]

[0055]

[0056] According to the length of the steel cage, the buttress device is installed in sections, and the same steel cage should have no less than two groups. The corresponding relationship between the length of the steel cage and the number of buttress device groups installed is shown in Table 3. Fig.13 The installation of two sets of buttress devices for each steel cage is demonstrated as an example.

[0057] Table 3 Correspondence between the diameter of the steel cage and the number of buttress installation devices

[0058]

[0059] like Fig.13 , Fig.14 As shown in the figure, after the steel cage is made, the buttress device is connected to the main reinforcement of the steel cage through buckles, with 4 groups at each location, distributed in a circle that divides the cross section of the steel cage into four equal parts, and each steel cage is connected to at least two buttress devices. During the drilling process of the steel cage, the buttress wheel supports the hole wall to ensure the distance between the steel cage and the hole wall, thereby ensuring the thickness of the concrete cover.

[0060] When the buttress device is installed on the steel cage, the connection position between the buckle and the main reinforcement of the steel cage can be adjusted up and down according to the required thickness of the protective layer, thereby adjusting the thickness of the protective layer. For more complex formations such as collapsed formations, reduced diameter formations, and karst development formations, the buttress function of the buttress device can ensure the verticality of the steel cage.

[0061] After the steel cage is lowered to the drilling completion, concrete pouring is carried out. Due to the supporting effect of the buttress wheel, the distance from the outer edge of the outermost steel bar of the steel cage to the hole wall is guaranteed, thereby ensuring that the thickness of the concrete protective layer of the steel cage is uniform, reasonable and effective.

[0062] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A buttress device capable of adjusting the thickness of the protective layer of a pile foundation steel cage, installed on the main reinforcement of the steel cage, characterized in that: The buttress device comprises a buttress frame and a buttress wheel; The buttress frame comprises an adjustment assembly and a connecting crossbar, the two ends of the connecting crossbar are connected to the adjustment assembly, and the buttress wheel is rotatably mounted on the connecting crossbar; The adjustment component includes a connecting vertical rod and a connecting diagonal rod, the connecting vertical rod is parallel to the main reinforcement, the radial outer end of the connecting diagonal rod is hinged to the end of the connecting vertical rod, and the radial inner end of the connecting diagonal rod is vertically slidably connected to the main reinforcement of the steel cage.

2. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 1, characterized in that: The connecting cross bar is located radially outside the steel cage, and is arc-shaped, and the curvature of the connecting cross bar matches the curvature of the steel cage.

3. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 1, characterized in that: The buttress wheel is a disc-shaped structure, and has a central hole. The diameter of the central hole is larger than the diameter of the connecting cross bar, and the central hole of the buttress wheel is sleeved on the connecting cross bar.

4. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 1, characterized in that: Both ends of the connecting cross bar are respectively connected to the connecting vertical bars of the adjusting assembly, and the connecting cross bar is fixedly connected to the connecting vertical bar.

5. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 1, characterized in that: The upper and lower ends of the connecting vertical rod are respectively connected to a group of connecting oblique rods, each group of connecting oblique rods and the main reinforcement form a triangle, and the end of the connecting vertical rod is located at the vertex angle of the radial outer end of the triangle.

6. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 5, characterized in that: Each group of connecting oblique rods has two connecting oblique rods, the radial outer ends of the two connecting oblique rods are connected to one end of the connecting vertical rod, and the radial inner ends of the two connecting oblique rods are connected to different vertical positions of the main reinforcement.

7. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 5, characterized in that: The end of the connecting vertical rod is provided with a fork ear, a groove is formed in the middle of the fork ear, and the radial outer end of the connecting oblique rod is provided with an ear part, the ear part is inserted into the groove of the fork ear, and is rotatably connected through a pin shaft.

8. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 5, characterized in that: Each group of connecting oblique rods is fixed to the main reinforcement by a pair of clips. The radial inner end of the connecting oblique rod is provided with an arc plate. The clip has a slot. The clip is sleeved on the main reinforcement and the two open slots are arranged opposite to each other. The clip presses the arc plate tightly against the main reinforcement and locks it.

9. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 1, characterized in that: The connecting horizontal rods, connecting vertical rods and connecting diagonal rods are all made of steel bars, and the buttress wheels are concrete wheels.

10. The buttress device capable of adjusting the thickness of the pile foundation reinforcement cage protective layer as claimed in claim 1, characterized in that: At least two groups of buttress devices are arranged along the axial direction of the steel cage, and each group is arranged with at least four buttress devices.

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