Quick dismantling device for concrete formwork positioning joint bar

Abstract

The utility model relates to the technical field of concrete construction, and discloses a concrete formwork positioning joint bar quick dismantling device which comprises two steel bars. Each steel bar is sequentially composed of a head part, a working area and a tail part. The heads of the two steel bars are welded and connected side by side to form a double-sided welding seam; the vertexes of the first included angles of the two steel bars coincide with each other; and the working areas of the two steel bars are far away from each other and form a third included angle. The template positioning joint bar pulling device is used for pulling out template positioning joint bars, construction is fast and labor-saving, and the problem that labor and time are wasted when the joint bars are pulled out due to the fact that the inserting depth is too large is effectively solved. The device is high in applicability and convenient to machine, local materials are used, and machining can be conducted by using reinforcing steel bars, bending machines and welding machines on construction sites.

Description

Technical field:

[0001] The utility model relates to the technical field of concrete construction, in particular to a device for quickly removing concrete formwork positioning and reinforcing bars. Background technology:

[0002] During the construction of concrete structures, concrete pouring of beams and foundations including walls will be encountered. In order to prevent the occurrence of mold running during concrete pouring, local steel bars are used as positioning bars on the outside of the formwork. Usually after the concrete pouring is completed, the positioning bars will be manually pulled out and reused by workers when the formwork is removed. If steel bars are inserted deep into the ground or foundation for reinforcement, workers will be unable to remove them or have difficulty removing them, which can easily lead to waste of resources and low worker efficiency. Utility model content:

[0003] In order to conveniently and quickly remove the positioning dowels fixed on the outside of the concrete structure construction template, the utility model provides a concrete template positioning dowel fast removal device. Specifically, the utility model discloses the following technical solutions:

[0004] A device for quickly removing a positioning dowel bar of a concrete formwork comprises two steel bars; each of the steel bars is composed of three parts, a head, a working area and a tail; on each steel bar, the working area is bent counterclockwise with the connection point between the working area and the head as a fulcrum to form a first angle, and the tail is bent clockwise with the connection point between the working area and the tail as a fulcrum to form a second angle; the head, the working area and the tail of each steel bar are all in the same plane;

[0005] The heads of the two steel bars are welded side by side to form a double-sided weld; the vertices of the first angle of the two steel bars overlap each other; the working areas of the two steel bars are separated and form a third angle.

[0006] Preferably, the heads, working areas and tails of the two steel bars are all in the same plane.

[0007] Preferably, the lengths of the heads of the two steel bars are equal; and the lengths of the working areas of the two steel bars are equal.

[0008] Preferably, the third angle is greater than or equal to 20° and less than or equal to 80°.

[0009] Preferably, the tail portions of the two steel bars are parallel to each other.

[0010] Preferably, the working area surface comprises threads.

[0011] Preferably, the concrete formwork positioning dowel fast removal device also includes pads.

[0012] Compared with the prior art, the utility model has the following beneficial effects: Compared with the prior art of workers manually removing the inserted steel bars, the utility model is used to remove the inserted steel bars by positioning the template, which is quick and labor-saving, and effectively solves the problem that the inserted steel bars are too deep, which makes the removal laborious and time-consuming. The utility model has strong applicability and can be applied to steel bar inserted steel bars of various diameters. It is not only applicable to threaded steel bar inserted steel bars, but also to square steel, round steel, wood, etc. It can also increase or decrease the third angle through modification, and remove other components with larger or smaller diameters. The utility model is easy to process, and can be processed by using local materials, and can be processed using steel bars, bending machines, and welding machines on the construction site. Description of the drawings:

[0013] Figure 1 It is a top view of the schematic diagram of the application of the utility model in concrete construction;

[0014] Figure 2 It is a side view of a schematic diagram of the application of the utility model in concrete construction;

[0015] Figure 3 This is a front view of the utility model when clamping a dowel;

[0016] Figure 4 It is a top view of the utility model when clamping the dowel.

[0017] Description of reference numerals:

[0018] 1. Double-sided weld; 2. Rebar; 201. Head; 202. Working area; 203. Tail; 204. First angle; 205. Third angle; 206. Second angle; 3. Dowels; 4. Pads; 5. Formwork; 6. Secondary square timber ribs; 7. Primary ribs; 8. Reinforcing square timber; 9. Concrete; 10. Foundation surface. Specific implementation method:

[0019] The present invention is further described below in conjunction with specific implementation methods. The specific implementation methods are further descriptions of the principles of the present invention and do not limit the present invention in any way. Technologies identical or similar to the present invention do not exceed the scope of protection of the present invention.

[0020] See attached Figure 3 and Figure 4, a concrete formwork positioning dowel fast removal device, comprising two steel bars 2; each of the steel bars 2 is composed of three parts, namely, a head 201, a working area 202 and a tail 203. That is, the head 201 is connected to the working area 202, and the working area 202 is connected to the tail 203, so as to form the whole of each steel bar 2; in practice, preferably, the head 201, the working area 202 and the tail 203 are all straight. On each of the steel bars 2, the working area 202 is bent counterclockwise with the connection point between the working area 202 and the head 201 as a fulcrum to form a first angle 204, and at the same time, the tail 203 is bent clockwise with the connection point between the working area 202 and the tail 203 as a fulcrum to form a second angle 206. That is to say, the bending direction of the working area 202 is opposite to the bending direction of the tail 203. The head 201, the working area 201 and the tail 203 of the same steel bar are all in the same plane; the heads 201 of the two steel bars 2 are welded side by side to form a double-sided weld 1. The vertices of the first angles 204 of the two steel bars overlap with each other; it should be noted here that in practice, the steel bar has a diameter, not a virtual line, so the vertices of the two first angles 204 overlap with each other means that the edges of the two vertices are in contact with each other or the line connecting the centers of the vertices is perpendicular to the straight line where the head 201 is located; the working areas 202 of the two steel bars 2 are far away from each other, do not overlap with each other, and form a third angle 205. In other words, after the heads 201 of the two steel bars 2 are welded side by side, the working areas 202 of the two steel bars 2 do not overlap with each other.

[0021] When using, see the attached Figure 1 and Figure 2, concrete 9 is poured on the foundation surface 10. The formwork 5 used when pouring concrete 9 includes square wood secondary ribs 6, main ribs 7, and reinforcing square wood 8. After the concrete 9 is poured for a period of time, when its strength reaches the condition for demoulding, the outer dowel 3 of the formwork 5 is removed by the utility model. First, the utility model is placed on the concrete 9, and a fulcrum is formed at the front end of the working area 202 or the tail 203 to support the utility model; the dowel 3 is inserted into the working area 203, so that the dowel 3 is clamped in the third angle 205, and the dowel 3 is in close contact with the working area 202 of the steel bar 2, forming the working conditions of the utility model. Then, using the principle of lever, pressure is applied to the tails 203 of the two steel bars 2 at the same time to the rear and downward, so that the tail 203 is pressed vertically downward while driving the two steel bars 2 to move backward, and the dowel 3 naturally moves to the side with a smaller opening of the working area 202, thereby forming the bite of the working area 202 to the dowel 3. The vertical downward pressure exerted on the tail portion 203 drives the working area 202 in the form of a lever to form a vertical upward pulling force on the inserted reinforcing bar 3, thereby achieving the purpose of pulling out the inserted reinforcing bar 3.

[0022] Preferably, the lengths of the working area 202 and the tail 203 are designed according to the actual resistance of the inserted reinforcement 3 during the construction of the concrete 9, so that the tail 203, as a power arm, is 5 to 8 times the length of the resistance arm when the inserted reinforcement is pulled out. That is to say, the force required to be applied by the utility model is only 1 / 8 to 1 / 5 of the force of manually pulling out the inserted reinforcement, achieving the effect of saving effort and time.

[0023] As a further technical solution of the above embodiment, the head 201, the working area 202 and the tail 203 of the two steel bars 2 are all in the same plane. In other words, the first angle 204 of the two steel bars 2 is in the same plane. Through plane geometry calculation, the sum of the supplementary angles of the first angle 204 of the two steel bars 2 is equal to the third angle 205.

[0024] A further preferred technical solution is that the lengths of the heads 201 of the two steel bars 2 are equal; the lengths of the working areas 202 of the two steel bars 2 are equal, so that when welding the double-sided weld, the two heads are arranged in parallel and neatly; the third angle formed by the working areas of the two steel bars is 20°-80°, which is used to remove the inserted bars 3 of different diameters. Specifically, the supplementary angle of the first angle formed after the two steel bars 2 are bent is 10°~40°, and the third angle 205 formed by the two steel bars 2 is 20°~80°; the diameter of each steel bar 2 is 16mm~25mm, the total length of each steel bar 2 is 1.3m~1.7m, the lengths of the heads 201 of the two steel bars 2 are equal, which is 6cm~10cm, and the double-sided weld 1 is formed after double-sided welding; the length of the working area is about 20cm. The total length of each steel bar 2 after deducting the head 201 and the working area 202 is the length of the tail 203, thereby ensuring that the power arm when removing the inserted steel bar 3 is 5 to 7 times the resistance arm, achieving a labor-saving effect. Preferably, the tails 203 of the two steel bars 2 are parallel to each other.

[0025] Preferably, the surface of the working area 202 includes threads, and the threads are used as ribs to increase the friction between the working area 202 and the inserted bar 3. In practice, the ribs of the steel bar 2 itself are used as clamping teeth to clamp the inserted bar 3, thereby increasing the friction between the working area and the pulled and inserted bar 3. In practice, threaded steel bars can be used to make the steel bar 2, so that the working area 202 includes threads, and even when the inserted bar 3 is threaded, the ribs of the threads of the two can enhance the interlocking effect and form a shear force between the threads.

[0026] Preferably, the concrete formwork positioning dowel fast removal device further comprises a pad 4. When in use, the pad 4 is placed on the poured concrete 9 near the outer side of the formwork 5, and the steel bar 2 is placed on the pad 4 to form a fulcrum for supporting the utility model. The purpose of the pad 4 is to disperse the pressure and avoid damage to the surface layer of the concrete 9. The utility model will not slip during operation, which increases the reliability of the utility model and increases the operating space of the utility model. When in use, the pads 4 are used to form a fulcrum on the concrete 9 that has reached the demoulding conditions, and the working area 202 and the head 201 are tilted downward to form a lever, and pressure is applied to the tail 203 obliquely downward and backward, so that the tail 203 presses vertically downward while driving the two steel bars 2 to move backward, and the inserted rebar 3 naturally moves to the side with a smaller opening of the working area 202, thereby forming a tight bite of the working area 202 on the inserted rebar 3; the vertical downward pressure force applied to the tail 203 drives the working area 202 to form a vertical upward pulling force on the inserted rebar 3 in the form of a lever, thereby achieving the purpose of pulling out the inserted rebar 3.

[0027] Using this technical solution, the manufacturing and construction steps of the utility model are as follows:

[0028] Cut two 1.3-1.7m threaded steel bars, reserve 6-10cm at one end as the head using a bending machine, then bend counterclockwise to form an angle of about 10°-40°, reserve 20cm as the working area, and bend the remaining part clockwise to be parallel to the head. The two threaded steel bars are symmetrically welded with the 6-10cm area of ​​the head as the connecting section to form a triangular working area, thereby forming the utility model. Pads 4 are set on the concrete surface that meets the demolding conditions. With the pads 4 as the fulcrum, the utility model is placed on the pads 4, and the inserted rebar 3 is inserted into the working area 202, so that the working area and the head are tilted downward to form a lever, and a pressure is applied to the tail to be diagonally downward, and the inserted rebar 3 is pulled out under the force of the lever.

Claims

1. A device for quickly removing the positioning and inserting bars of a concrete formwork, characterized in that It comprises two steel bars; each of the steel bars is composed of three parts, namely, a head, a working area and a tail; on each steel bar, the working area is bent counterclockwise with the connection point between the working area and the head as a fulcrum to form a first angle, and the tail is bent clockwise with the connection point between the working area and the tail as a fulcrum to form a second angle; the head, the working area and the tail of each steel bar are all in the same plane; The heads of the two steel bars are welded side by side to form a double-sided weld; the vertices of the first angle of the two steel bars overlap each other; and the working areas of the two steel bars are separated and form a third angle.

2. The removal device according to claim 1, characterized in that The heads, working areas and tails of the two steel bars are all in the same plane.

3. The removal device according to claim 1, characterized in that The lengths of the heads of the two steel bars are equal, and the lengths of the working areas of the two steel bars are equal.

4. The removal device according to claim 1, characterized in that The third angle is greater than or equal to 20° and less than or equal to 80°.

5. The removal device according to claim 1, characterized in that The tails of the two steel bars are parallel to each other.

6. The removal device according to claim 1, characterized in that The working area surface includes threads.

7. The removal device according to any one of claims 1 to 6, characterized in that The dismantling device also includes skids.

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