Concrete cushion block for controlling thickness of steel bar protective layer

Abstract

The utility model discloses a concrete cushion block for controlling the thickness of a steel bar protective layer, which comprises a cushion block body and a support connecting rod, the cushion block body is a fine aggregate concrete precast block in the shape of a circular truncated cone, and the support connecting rod is a rigid rod piece and is arranged along a platform shaft of the cushion block body. One end of the supporting connecting rod is inserted into the large end of the cushion block body and anchored in the cushion block body to form an anchoring section, and the other end of the supporting connecting rod extends to the outer side of the cushion block body to form a free section in an overhanging state. The cushion block is simple in structure and ingenious in design, the cushion block body is in a circular truncated cone shape and can be better and tightly combined with post-cast structural concrete, later cracks are reduced, durability of the structural concrete is guaranteed, the supporting connecting rod anchored in the cushion block body can guarantee stability of the arrangement position of the cushion block body, accidental falling of the cushion block body is avoided, and meanwhile the cushion block is convenient to use. Meanwhile, the cushion block body made of the high-grade concrete material is also prevented from being extruded and broken, the manufacturing cost of the cushion block is low, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of reinforced concrete pouring construction, in particular to a concrete pad used for controlling the thickness of a steel bar protective layer. Background Art

[0002] In reinforced concrete pouring, the control of protective layer thickness is a key control link in the concrete pouring process. The general practice in the prior art is to use square or cylindrical prefabricated mortar pads or plastic pads to control the thickness of the concrete pouring protective layer. Some construction sites also use painted steel bars as protective layer pads. Limited by the strength and physical properties of the material itself, the pads in the existing structural form generally have the problem of being squeezed and broken or falling off from the original position due to construction disturbance, which has an adverse effect on the control of the thickness of the concrete protective layer during construction. At the same time, after pouring, small cracks are easily formed at the joint surface between the pads in the existing structural form and the concrete over time, affecting the durability of the concrete after completion. Moreover, this type of problem has a lag, which brings difficulties to maintenance within the design service life of the project.

[0003] How to ensure the stability and integrity of concrete pads during the process of steel bar binding and concrete pouring is the core of controlling the thickness of concrete protective layer. This requires that during the process of steel bar binding and concrete pouring, the protective layer pads will not be broken due to the extrusion of structural reinforcement and the impact pressure of pouring vibration, which will affect the thickness of concrete protective layer. At the same time, it is necessary to consider that after pouring, the pads and concrete need to be tightly combined within the design service life of the building, which puts higher requirements on the stability of the properties of the pad materials, the structural stability and the tightness of the combination with concrete. Utility Model Content

[0004] The utility model aims to provide a concrete pad for controlling the thickness of a steel bar protective layer, so as to solve the technical problem described in the background technology.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] A concrete pad for controlling the thickness of a steel bar protective layer comprises a pad body and a supporting connecting rod, wherein the pad body is a truncated cone-shaped prefabricated block of fine stone concrete, and the supporting connecting rod is a rigid rod member, which is arranged along the axis of the pad body. One end of the supporting connecting rod is inserted into the large end of the pad body and anchored in the pad body to form an anchoring section, and the other end of the supporting connecting rod extends to the outside of the pad body to form a free section in a cantilevered state.

[0007] Preferably, the anchoring section of the support link anchored into the interior of the cushion block body is fixedly provided with at least one anti-pullout anchor bar, and the anchoring section of the support link and the anti-pullout anchor bar are both coated with anti-rust paint.

[0008] Preferably, the strength of the fine stone concrete used for casting the pad body is greater than the strength of the on-site structural concrete corresponding to the placement location of the pad.

[0009] Preferably, the support connecting rod is made of a threaded rod, and at least one set of limiting and fixing components is arranged on the free section of the support connecting rod, each set of limiting and fixing components consists of two adjusting nuts and two positioning clips, the two adjusting nuts are correspondingly sleeved on the support connecting rod and cooperate with the support connecting rod threads, and the two positioning clips are correspondingly arranged on the support connecting rod between the two adjusting nuts, one end of the positioning clip is sleeved on the support connecting rod and can slide freely along the support connecting rod, and the other end extends to the outside of the support connecting rod for cooperating with the clamping structure reinforcement.

[0010] Preferably, the cushion block body uses a disposable paper cup as a casting mold.

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model has a simple structure and ingenious design. The pad body is truncated cone-shaped with a small bottom and a large upper part. It can be better combined with the post-cast structural concrete, reduce the occurrence of cracks in the later stage, and ensure the durability of the structural concrete. The supporting connecting rod anchored in the pad body can ensure the stability of the setting position of the pad body and avoid its accidental falling off. At the same time, the pad body made of higher-grade concrete material also avoids the risk of being squeezed and broken. The pad manufacturing materials of the corresponding structural form of the utility model are simple and common, with low manufacturing cost and good economy. It can be produced in large quantities at the same time, and disposable paper cups can also be used in rotation, which greatly saves the manufacturing cost of the pad and achieves the purpose of reducing costs and increasing efficiency, which is in line with the concept of green construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or other aspects and advantages of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings, which are only schematic and do not limit the present invention, wherein:

[0013] Figure 1 This is a schematic diagram of the installation structure of a concrete pad for controlling the thickness of a steel bar protective layer involved in the utility model;

[0014] Figure 2 This is a structural schematic diagram of a concrete pad used for controlling the thickness of a steel bar protective layer involved in the utility model;

[0015] Figure 3 This is a structural schematic diagram of a concrete pad for controlling the thickness of a steel bar protective layer involved in the utility model when it is made using a casting mold;

[0016] Figure 4The utility model is a schematic structural diagram of a position limiting and fixing assembly of a concrete pad for controlling the thickness of a steel bar protective layer.

[0017] Figure numerals: 1. pad body; 2. supporting connecting rod; 3. casting mold; 4. adjusting nut; 5. positioning clip; 6. anti-pull-out anchor bar; 7. structural reinforcement; 8. template. DETAILED DESCRIPTION

[0018] Hereinafter, an embodiment of a concrete pad for controlling the thickness of a steel bar protective layer of the utility model will be described with reference to the accompanying drawings. The embodiments described herein are specific embodiments of the utility model, which are used to illustrate the concept of the utility model, are explanatory and exemplary, and should not be interpreted as limiting the implementation mode of the utility model and the scope of the utility model. In addition to the embodiments described herein, those skilled in the art can also adopt other obvious technical solutions based on the contents disclosed in the claims and the specification of this application, including technical solutions that adopt any obvious replacement and modification of the embodiments described herein.

[0019] In the description of the present invention, it should be noted that the terms "front", "rear", "left", "right", "top", "bottom", "up", "down", "inside", "outside", "horizontal", "longitudinal", "vertical", "oblique" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] The drawings of this specification are schematic diagrams, which assist in explaining the concept of the utility model and schematically show the shapes of various parts and their mutual relationships. Please note that in order to clearly show the structure of various components of the embodiments of the utility model, the drawings are not drawn according to the same scale. The same reference numerals are used to represent the same parts.

[0021] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not intended to limit the scope of the present invention. Figure 1-4 , the preferred embodiments of the utility model are further described in detail:

[0022] like Figure 1-2As shown in the figure, a preferred concrete cushion block for controlling the thickness of the steel bar protection layer of the present utility model includes a cushion block body 1 and a support connecting rod 2. The cushion block body 1 is a fine aggregate concrete precast block in the shape of a frustum of a cone. The support connecting rod 2 is a rigid rod. The support connecting rod 2 is arranged along the axis of the frustum of the cushion block body 1. One end of the rod body of the support connecting rod 2 is inserted into the large end of the cushion block body 1 and anchored in the cushion block body 1 to form an anchoring section, and the other end of the rod body extends to the outside of the cushion block body 1 to form a free section in a cantilever state;

[0023] Compared with the structural reinforcement 7, the thickness of the protection layer on the outside of the support connecting rod 2 made of metal material inserted into the cushion block body 1 is smaller, and it is more likely to be invaded by water vapor and corroded during the later operation and maintenance stage. Therefore, it is necessary to apply anti-rust paint on the outer surface of the anchoring section of the support connecting rod 2 for secondary protection. However, after applying the anti-rust paint, the bonding ability between the support connecting rod 2 and the cushion block body 1 is reduced, and it is easy to fall off after prefabrication. Therefore, at least one anti-pulling anchor bar 6 needs to be welded and fixed to the anchoring section where the support connecting rod 2 is anchored into the cushion block body 1. Usually, 1-2 roots are appropriate. The anti-pulling anchor bar 6 is preferably welded vertically on the support connecting rod 2 to form a "T" - shaped or "soil" - shaped rod with it. Of course, the outer surface of the anti-pulling anchor bar 6 also needs to be uniformly coated with anti-rust paint for anti-corrosion;

[0024] Usually, the support connecting rod 2 will be made of the waste round steel bar heads on the construction site. At this time, during the installation process, the support connecting rod 2 needs to be fixed to the structural reinforcement 7 by tying or welding so that the cushion block body 1 can stably resist the formwork 8. However, the tying and welding operations are relatively cumbersome, and it is easy to have the problem that the support connecting rod 2 is set obliquely. Therefore, the support connecting rod 2 can be optimized into a threaded rod structure form. At this time, the support connecting rod 2 can specifically be made of the waste formwork installation tie rod scraps on the construction site. Based on this, at least one set of limit fixing components can be further arranged on the free section of the support connecting rod 2. The number of the limit fixing components is preferably 1-2 groups to ensure that the support connecting rod 2 can be effectively fixed on the structural reinforcement 7. As Figure 4 shown in the figure, each set of limit fixing components consists of two adjusting nuts 4 and two positioning clips 5. The two adjusting nuts 4 are correspondingly sleeved on the support connecting rod 2 and are in threaded cooperation with the support connecting rod 2. And the two positioning clips 5 are correspondingly arranged on the support connecting rod 2 between the two adjusting nuts 4. One end of the positioning clip 5 is sleeved on the support connecting rod 2 and can slide freely along the support connecting rod 2, and the other end extends to the outside of the support connecting rod 2 for cooperating to clamp the structural reinforcement 7. During installation, only need to first slide the two positioning clips 5 into position to clamp the structural reinforcement 7, and then turn the adjusting nuts 4 on both sides to make the adjusting nuts 4 on both sides press the positioning clips 5, so that the two positioning clips 5 can clamp the structural reinforcement 7. Of course, a gasket can also be added on the screw rod section between the adjusting nut 4 and the positioning clip 5 so that the adjusting nut 4 can better press the positioning clip 5.

[0025] The specific production process of the utility model is as follows:

[0026] First, if Figure 3 As shown, a disposable paper cup is used as a casting mold 3, the thickness of the protective layer is determined according to the design and specification requirements, and a line is drawn on the outer wall of the disposable paper cup to mark the depth of concrete pouring into the cushion body 1;

[0027] Then, use a small spoon to pour fine stone concrete into the cup to the mark. The strength of fine stone concrete should be slightly greater than that of on-site structural concrete. Place the paper cup containing fine stone concrete on the mortar vibration plate and vibrate for 5-8 seconds;

[0028] Before the initial setting of the concrete, insert the support link 2 with the penetration depth marked at the center of the cup (if necessary, the end of the support link 2 needs to be welded with the anti-pullout anchor 6 in advance and painted with anti-rust paint) and evenly spread the concrete surface in the cup, keeping the painted part downward in contact with the concrete in the cup, and ensure that the penetration depth is at a certain distance from the bottom of the cup (the penetration depth can be confirmed by the length of the anti-rust paint);

[0029] After 24 hours, the cushion block body 1 is demoulded and placed in a water pool for curing to the designed strength.

[0030] The actual installation process of the utility model is as follows:

[0031] Install the pad on the structural reinforcement 7. The support link 2 in the form of round steel bars can be fixed by bending, bundling, or welding. The support link 2 in the form of threaded rods can be fixed by tightening the positioning clip 5 to clamp the structural reinforcement 7 by screwing the adjusting nut 4. During installation, ensure that the spacing meets the design requirements;

[0032] After that, the formwork 8 is installed, and the pads are checked for firmness. The thickness of the pads is re-measured to ensure that the thickness of the concrete cover meets the design and specification requirements.

[0033] Next, pour the structural concrete, keeping the vibrator away from direct contact with the pads.

[0034] The present application effectively solves the problem of insufficient thickness of the steel bar protective layer during concrete pouring, and the problem of small cracks forming at the joint between the concrete protective layer and the pad body 1 due to loose bonding after pouring, which affects the durability of the concrete.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete pad for controlling the thickness of steel bar cover, characterized by: The invention comprises a pad body (1) and a supporting connecting rod (2), wherein the pad body (1) is a truncated cone-shaped fine stone concrete prefabricated block, and the supporting connecting rod (2) is a rigid rod member, which is arranged along the axis of the pad body (1). One end of the supporting connecting rod (2) is inserted into the large end of the pad body (1) and anchored in the pad body (1) to form an anchoring section, and the other end of the supporting connecting rod extends to the outside of the pad body (1) to form a free section in a cantilevered state.

2. A concrete pad for controlling the thickness of a steel bar protective layer according to claim 1, characterized in that: The anchoring section of the support link (2) anchored into the interior of the pad body (1) is fixedly provided with at least one anti-pullout anchor bar (6), and the surfaces of the anchoring section of the support link (2) and the anti-pullout anchor bar (6) are both painted with anti-rust paint.

3. The concrete pad for controlling the thickness of the steel bar cover according to claim 1, characterized in that: The strength of the fine stone concrete used for casting the pad body (1) is greater than the strength of the on-site structural concrete corresponding to the placement location of the pad body (1).

4. The concrete pad for controlling the thickness of the steel bar cover according to claim 1, characterized in that: The support link (2) is made of a threaded rod, and at least one set of position-limiting fixing components is provided on the free section of the support link (2), and each set of position-limiting fixing components consists of two adjusting nuts (4) and two positioning clips (5), the two adjusting nuts (4) are correspondingly sleeved on the support link (2) and engaged with the thread of the support link (2), and the two positioning clips (5) are correspondingly arranged on the support link (2) between the two adjusting nuts (4), one end of the positioning clip (5) is sleeved on the support link (2) and can slide freely along the support link (2), and the other end extends to the outside of the support link (2) for engaging with the clamping structure reinforcement (7).

5. The concrete pad for controlling the thickness of the steel bar cover according to claim 1, characterized in that: The pad block body (1) uses a disposable paper cup as a casting mold (3).

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