A kind of existing reinforced concrete column head structure and manufacturing method thereof

Abstract

The present invention provides an existing reinforced concrete column head structure and a manufacturing method thereof, and relates to the field of building technology. The existing reinforced concrete column head structure is used to fix a bearing object. The existing reinforced concrete column head structure includes an existing reinforced concrete column head, a bonding material and a steel casing. The steel casing is arranged outside the existing reinforced concrete column head. There is a certain gap between the steel casing and the existing reinforced concrete column head. The gap is filled with bonding material to connect the steel casing and the existing reinforced concrete column head together. An installation component is arranged on the steel casing, and the steel casing is connected to the bearing object through the installation component. The existing reinforced concrete column head is connected to the steel casing through the bonding material, and the steel casing is arranged on the steel casing. The steel casing can be connected to the bearing object through the installation component to fix the bearing object. There is no need to drill holes on the existing reinforced concrete column head and reinstall the embedded parts, and the original column reinforcement of the existing reinforced concrete column head will not be damaged. The bearing object is fixed on the existing reinforced concrete column head through the installation component, and the safety hazard is small.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to an existing reinforced concrete column head structure and a manufacturing method thereof. Background Art

[0002] Existing reinforced concrete column heads are widely used in daily life, and they mainly play a fixing role. For example, the canopy is connected to the existing reinforced concrete column head through a support rod, and the existing reinforced concrete column head fixes the canopy through the support rod. One end of the support rod is connected to the embedded parts on the existing reinforced concrete column head, and the other end is connected to the canopy; however, when manufacturing the existing reinforced concrete column head, sometimes the embedded parts are not installed, and it is necessary to reinstall the embedded parts on the existing reinforced concrete column head before connecting with the support rod. If the embedded parts are reinstalled on the existing reinforced concrete column head, it is necessary to drill holes in the existing reinforced concrete column head, which is easy to damage the original column reinforcement of the existing reinforced concrete column head. The reinstalled embedded parts have great safety hazards during use. Summary of the invention

[0003] In view of this, the purpose of the present invention is to overcome the deficiencies in the prior art and provide an existing reinforced concrete column head structure and a manufacturing method thereof.

[0004] The present invention provides the following technical solution: an existing reinforced concrete column head structure, used for fixing a load-bearing object, the existing reinforced concrete column head structure comprises an existing reinforced concrete column head, a bonding material and a steel casing, the steel casing is arranged on the outside of the existing reinforced concrete column head, there is a gap between the steel casing and the existing reinforced concrete column head, the gap is filled with bonding material to connect the steel casing and the existing reinforced concrete column head together; the steel casing is connected to the load-bearing object through the installation assembly.

[0005] Furthermore, the steel casing is sleeved on the existing reinforced concrete column head, and the steel casing is connected to the bonding material; the existing reinforced concrete column head is arranged on the inner side of the steel casing, and the installation assembly is arranged on the outer side of the steel casing.

[0006] Furthermore, a reinforcing steel bar is arranged between the existing reinforced concrete column head and the steel casing, one end of the reinforcing steel bar is connected to the inner side surface of the steel casing, the other end of the reinforcing steel bar is connected to the inside of the existing reinforced concrete column head, and the middle part of the reinforcing steel bar is arranged in the bonding material.

[0007] Furthermore, the existing reinforced concrete column head is provided with column longitudinal bars whose number is the same as the reinforcing steel bars, and the column longitudinal bars are connected to the ends of the reinforcing steel bars.

[0008] Furthermore, the length of the reinforcing steel bar connected to the steel casing and each of the column longitudinal bars is not less than ten times the diameter of the reinforcing steel bar.

[0009] Furthermore, the cross-sectional length of the existing reinforced concrete column head is A, and the cross-sectional width is B; the cross-sectional length of the steel casing is A+2*X, and the cross-sectional width is B+2*Y; wherein, X and Y are not less than 100 mm.

[0010] Furthermore, a plurality of shear keys are provided on the inner side surface of the steel casing, and the plurality of shear keys are evenly connected to the inner side surface of the steel casing.

[0011] Furthermore, the mounting assembly includes a first mounting member, a second mounting member, a third mounting member and a pin shaft, the first mounting member is connected to the steel casing, and the first mounting member is hinged to one end of the third mounting member through the pin shaft, the other end of the third mounting member is connected to one end of the second mounting member, and the other end of the second mounting member is connected to a steel pull rod, and the steel pull rod is used to connect the load-bearing object.

[0012] Furthermore, the installation assembly includes a weld and a pin, and the steel casing is connected to the bearing object through the weld and the pin.

[0013] In a second aspect, the present application also provides a method for manufacturing an existing reinforced concrete column head structure, which is used to manufacture the above-mentioned existing reinforced concrete column head structure, and the method comprises the following steps:

[0014] (a) removing the surface of the existing reinforced concrete column head along the circumferential direction of the existing reinforced concrete column head until the longitudinal reinforcement of the column is completely exposed, while retaining a complete section of the existing column head;

[0015] (b) roughening the surface of the removed reinforced concrete column head, removing loose impurities on the surface of the removed reinforced concrete column head with a tool, and rinsing it with clean water;

[0016] (c) a steel casing is installed on the existing reinforced concrete column head, and the same number of reinforcing steel bars as the column longitudinal bars are prepared, and the steel casing and the corresponding column longitudinal bars are welded at both ends of each reinforcing steel bar, and the length of each weld is 200 mm;

[0017] (d) pouring concrete into the cavity formed between the steel casing and the existing reinforced concrete column head;

[0018] (e) After the concrete is completely dry, the first mounting piece is welded to the weld of the steel casing;

[0019] (f) The first mounting member is hingedly connected to the third mounting member through a pin shaft, the weld on the third mounting member is welded to one end of the second mounting member, and the other end of the second mounting member is connected to the steel pull rod through a set weld.

[0020] The embodiments of the present invention have the following advantages: the existing reinforced concrete column head of the present application is connected to the steel casing through the steel casing, and the steel casing is provided with an installation component. The steel casing can be connected to the load-bearing object through the installation component to fix the load-bearing object. There is no need to drill holes on the existing reinforced concrete column head and reinstall the embedded parts, and the original column steel bars of the existing reinforced concrete column head will not be damaged. The load-bearing object is fixed on the existing reinforced concrete column head through the installation component, and the safety hazard is small.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A structural schematic diagram of an existing reinforced concrete column head structure is shown;

[0024] Figure 2 Shows Figure 1 Schematic diagram of the cross section in the CC direction;

[0025] Figure 3 A structural schematic diagram of a steel casing is shown;

[0026] Figure 4 Shows Figure 3 Schematic diagram of the cross section along the DD direction.

[0027] Description of main component symbols:

[0028] 1-existing reinforced concrete column head; 2-steel casing; 3-bonding material; 4-reinforcement steel bars; 5-shear key; 6-column longitudinal reinforcement; 7-installation assembly; 71-first installation part; 72-second installation part; 73-third installation part; 74-pin shaft; 8-steel tie rod; 9-complete section of existing column head. DETAILED DESCRIPTION

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] Example 1

[0035] The present application proposes an existing reinforced concrete column head structure, which can be used to fix a load-bearing object, and the load-bearing object can be a commonly used awning, parasol or street lamp, etc. The load-bearing object is fixed by connecting the embedded parts on the existing reinforced concrete column head 1; but when manufacturing the existing reinforced concrete column head 1, if the embedded parts are not installed, it is necessary to reinstall the embedded parts on the existing reinforced concrete column head 1 that has been manufactured, and connect the load-bearing object through the embedded parts. The existing method of reinstalling the embedded parts is to directly install the embedded parts on the existing reinforced concrete column head 1 using the rebar embedding technology, which requires drilling holes in the existing reinforced concrete column head 1. The original column reinforcement of the existing reinforced concrete column head 1 is easily damaged during the drilling process, and the installed embedded parts are easy to fall off during use, posing a safety hazard.

[0036] like Figure 1 As shown, the existing reinforced concrete column head structure of the present application includes an existing reinforced concrete column head 1, a bonding material 3 and a steel casing 2. The existing reinforced concrete column head 1 is arranged on one side of the bonding material 3, and the steel casing 2 is arranged on the other side of the existing reinforced concrete column head 1 away from the bonding material 3. The steel casing 2 is connected to the load-bearing object through the installation component 7 to fix the load-bearing object; there is no need to drill holes in the existing reinforced concrete column head 1, and the original column steel bars of the existing reinforced concrete column head 1 will not be damaged. The load-bearing object is fixed on the steel casing 2 through the installation component 7, and the stability is good and the safety hazard is small.

[0037] Furthermore, the steel casing 2 can be made of metal materials such as stainless steel, which will not rust after long-term use. The bonding material 3 can be concrete. In the actual processing process, the steel casing 2 is first sleeved on the circumferential direction of the existing reinforced concrete column head 1, and then the wet concrete is poured into the cavity between the steel casing 2 and the existing reinforced concrete column head 1. After the concrete is dried, the existing reinforced concrete column head 1 is connected to the steel casing 2. The two end surfaces of the concrete are respectively connected to the outer side surface of the existing reinforced concrete column head 1 and the inner side surface of the steel casing 2, and the installation component 7 is arranged on the outer side surface of the steel casing 2. Specifically, the inner side surface of the concrete is connected to the outer side surface of the existing reinforced concrete column head 1, and the outer side surface of the concrete is connected to the inner side surface of the steel casing 2.

[0038] In some feasible embodiments, the installation component 7 can be a detachable component installed on the outer side of the steel casing 2, or it can be a weld. The steel casing 2 can be fixedly connected to the carrier through a weld and a pin, or it can be detachably connected to the carrier through a detachable component. In order to save costs, the installation component 7 uses a weld, and is fixedly connected to the carrier by a weld and a pin, one end of the pin is welded to the weld, and the other end is fixedly connected to the carrier. The weld can be processed on the steel casing in advance, or the steel casing 2 can be installed on the existing reinforced concrete column head 1, and then the steel casing 2 can be processed to form a weld.

[0039] For the convenience of disassembly and assembly, the steel casing 2 can also be connected to the load-bearing object through a detachable component. Specifically, the detachable component includes a first mounting member 71, a second mounting member 72, a third mounting member 73 and a pin 74. A weld can be set in advance on the steel casing 2, and the first mounting member 71 can be connected to the steel casing 2 through a weld; one end of the third mounting member 73 is hinged to the first mounting member 71 through a pin 74, and the other end of the third mounting member 73 is connected to one end of the second mounting member 72, and the other end of the second mounting member 72 is connected to a steel tie rod 8. The steel tie rod 8 is used to connect the load-bearing object, and the load-bearing object applies a force to the steel tie rod 8, and the steel tie rod 8 applies a force to the steel casing 2 through the second mounting member 72, the third mounting member 73, and the first mounting member 71 in turn. The steel casing 2 applies a part of the force to the concrete, and applies the other part of the force to the column longitudinal reinforcement 6 of the existing reinforced concrete column head 1 through the reinforcing steel bar 4.

[0040] In addition, the steel tie rod 8 can be rotated relative to the steel sleeve via the pin 74 to facilitate adjustment of the position of the load.

[0041] In order to ensure that the steel casing 2 provides sufficient fixing effect on the load, the diameter of the steel casing 2 should be thick enough, and the diameter should be kept above 12 mm. The specific diameter can be determined according to the weight of the load. The heavier the load, the thicker the diameter of the steel casing 2 is set.

[0042] When the steel casing 2 is subjected to the force of the load-bearing object, the steel casing 2 generates a force on the concrete, and the concrete generates a force on the existing reinforced concrete column head 1. The existing reinforced concrete column head 1 will not be directly subjected to the entire force of the load-bearing object and is not easily damaged.

[0043] In some feasible embodiments, reinforcing steel bars 4 may be arranged between the existing reinforced concrete column head 1 and the steel casing 2, and the reinforcing steel bars 4 are used to further reinforce the steel casing, so that the steel casing 2 is not easy to loosen after long-term use, and the load is stable. One end of the reinforcing steel bar 4 is connected to the inner side of the steel casing, and the other end of the reinforcing steel bar 4 is connected to the outer side of the existing reinforced concrete column head 1, and the middle part of the reinforcing steel bar 4 is arranged in the concrete.

[0044] Furthermore, the two ends of the reinforcing steel bar 4 can be welded to the existing reinforced concrete column head 1 and the steel casing, respectively, and the two ends of the reinforcing steel bar 4 can also be detachably connected to the existing reinforced concrete column head 1 and the steel casing 2 by screws. When the load exerts a force on the steel casing 2, the steel casing 2 can exert part of the force on the existing reinforced concrete column head 1 through the reinforcing steel bar 4; when the concrete is damaged and cannot fix the steel casing 2, the existing reinforced concrete column head 1 can fix the steel casing 2 through the reinforcing steel bar 4, making the load more stable and further reducing safety hazards.

[0045] Specifically, a plurality of column longitudinal bars 6 are evenly arranged in the circumferential direction of the existing reinforced concrete column head 1, and the existing reinforced concrete column head 1 is connected to the end of the reinforcing steel bar 4 through the column longitudinal bars 6. The evenly arranged plurality of column longitudinal bars 6 are connected to the reinforcing steel bar 4, so that the existing reinforced concrete column head 1 is evenly stressed. In addition, the number of column longitudinal bars 6 and reinforcing steel bars 4 can be kept consistent, and the reinforcing steel bars 4 are connected to the column longitudinal bars 6 in a one-to-one correspondence.

[0046] like Figure 2 As shown, twelve or other numbers of reinforcing steel bars 4 can be provided. In this embodiment, twelve reinforcing steel bars 4 are provided, wherein two reinforcing steel bars 4 are connected to each of the two opposite sides of the steel casing 2, and four reinforcing steel bars 4 are connected to each of the other two opposite sides, and the other end of each reinforcing steel bar 4 is connected to the corresponding column longitudinal reinforcement 6.

[0047] When the load applies force to the steel casing 2, in order to ensure that the reinforcing steel bar 4 can sufficiently fix the steel casing, the connection length between the end of the reinforcing steel bar 4 and the steel casing 2 and the existing reinforced concrete column head 1 should be as large as possible. The length of the reinforcing steel bar 4 connected to the steel casing 2 and each column longitudinal bar 6 in this embodiment is not less than ten times the diameter of the reinforcing steel bar 4.

[0048] In some feasible embodiments, the concrete can be concrete or composite silicate cement, etc. The concrete in this embodiment is concrete. Concrete has a low cost and has a good fixing effect on the steel casing 2 and the reinforcing steel bar 4.

[0049] The shapes of the existing reinforced concrete column head 1 and the steel casing 2 can be circular, rectangular or square, etc. The shapes of the existing reinforced concrete column head 1 and the steel casing 2 of this embodiment are both rectangular. In order to ensure that the concrete provides sufficient fixing force for the steel casing 2 and can ensure sufficient fixing effect on the reinforcing steel bar 4, the volume of the concrete must be large enough, that is, the cavity formed between the existing reinforced concrete column head 1 and the steel casing 2 must be large enough to accommodate more concrete. After a large number of tests, it is found that the length of the cross section of the existing reinforced concrete column head 1 is A, the width is B, the length of the cross section of the steel casing 2 is A+2*X, and the width is B+2*Y; wherein, X and Y are not less than 100mm. When the existing reinforced concrete column head 1 and the steel casing 2 meet such size requirements, the concrete contained in the cavity can provide sufficient fixing force for the steel casing 2 and can ensure sufficient fixing effect on the reinforcing steel bar 4.

[0050] like Figure 3 and Figure 4 As shown, in order to allow the concrete to provide a further fixing effect on the steel casing 2 and make the load-bearing object connected to the steel casing 2 more stable, a plurality of shear keys 5 can be provided in the circumferential direction of the steel casing 2, and the plurality of shear keys 5 are evenly connected to the inner side surface of the steel casing 2. The steel casing 2 can be connected with a plurality of shear keys 5 by welding, and the shear keys 5 are in contact with the concrete. When the steel casing 2 is separated from the concrete, the concrete exerts a certain pulling force on the shear keys 5 provided on the steel casing 2. When the inner side surface of the steel casing 2 is loosely connected to the concrete, the loosening of the steel casing 2 can be avoided due to the effect of the shear keys 5.

[0051] In some feasible embodiments, the inner side surface of the steel casing 2 may be welded with a plurality of shear keys 5 in the length direction, width direction and height direction thereof, and the plurality of shear keys 5 may be uniformly welded in the length direction, width direction and height direction of the inner side surface of the steel casing 2 to ensure uniform stress on the steel casing 2. The steel casing 2 of this embodiment has six shear keys 5 welded on the four inner side surfaces, and each six shear keys 5 are uniformly welded on the corresponding inner side surfaces.

[0052] In order to ensure that the shear key 5 has a sufficient reinforcement effect on the steel casing, the length of the shear key 5 needs to be longer. The longer the length of the shear key 5, the larger the contact area between the shear key 5 and the concrete, and the stronger the reinforcement effect. After a large number of tests, it is found that the length of the shear key 5 is at least 50mm, so that the shear key 5 can have a sufficient reinforcement effect on the steel casing.

[0053] Furthermore, the shear key 5 can be a shear stud, which can better fix the steel casing 2 after being in contact with and connected to the concrete.

[0054] Example 2

[0055] This embodiment proposes a manufacturing method of an existing reinforced concrete column head structure, which is used to manufacture the above-mentioned existing reinforced concrete column head structure. In order to facilitate further description of the application of this application in practice, this embodiment lists one of the embodiments of each structure of this application for illustration. The strength grade of concrete used in this embodiment is C30, the shapes of the existing reinforced concrete column head 1 and the steel casing 2 are both square, the cross-sectional dimensions of the existing reinforced concrete column head 1 are A=500mm, B=500mm, the height of the existing reinforced concrete column head 1 is H=700mm, the number of column longitudinal bars 6 arranged on the existing reinforced concrete column head 1 is twelve, the diameter of each column longitudinal bar 6 is 20mm, and the column longitudinal bar 6 adopts grade III steel bars. During the on-site construction, the embedded parts were not installed on the existing reinforced concrete column head 1, and the steel tie rod 8 was subjected to tension during use, and the tension was 50KN. Now the steel tie rod 8 needs to be fixed on the steel casing 2.

[0056] The specific implementation steps are as follows:

[0057] First, the size of the steel casing is determined according to the size of the existing reinforced concrete column head. The length and width of the existing reinforced concrete column head in this embodiment are both 500mm, X=100mm, Y=100mm, then the cross-sectional size of the steel casing is A+2X=700mm, B+2Y=700mm. A plurality of shear studs are welded on the inner side of the steel casing 2, and the length of each shear stud is 50mm.

[0058] Then determine the steel material of the steel casing and the existing reinforced concrete column head 1, the wall thickness of the steel casing 2, the thickness of the first mounting member 71, the second mounting member 72 and the third mounting member 73, the diameter of the pin 74, the number, diameter and material grade of the reinforcing steel bars 4 and the existing reinforced concrete column head 1. The steel material used for the steel casing 2 and the existing reinforced concrete column head 1 can be Q235, Q255 or Q275, etc.

[0059] The steel casing of this embodiment and the existing reinforced concrete column head 1 use Q235 steel material; the wall thickness of the steel casing 2 is set to 12mm; the thickness of the first mounting member 71, the second mounting member 72 and the third mounting member 73 are all 20mm; the diameter of the pin 74 is 50mm; the number, diameter and material grade of the reinforcing steel bars 4 are consistent with the column longitudinal bars 6 of the existing reinforced concrete column head 1, the number is set to six, and the diameter of the reinforcing steel bars 4 is set to 20mm.

[0060] Finally, the construction steps are as follows:

[0061] (1) The concrete on the surface of the existing reinforced concrete column head 1 of suitable height is crushed along the circumferential direction; the suitable height is generally 700-100=600mm, and the concrete is crushed until the column longitudinal reinforcement 6 is exposed; at the same time, a section of the existing column head complete section 9 is retained, and the existing column head complete section 9 is located below the crushing position. The existing column head complete section 9 is used to ensure that the existing reinforced concrete column head 1 has sufficient structural strength, so that other components connected to the column longitudinal reinforcement 6 are more stable.

[0062] (2) Roughen the contact surface of the concrete with a hammer or a grinding machine, then use tools such as steel wire to remove loose debris, gravel, slag, dust and other impurities on the surface of the broken concrete, and rinse it with clean water.

[0063] (3) The steel casing 2 is installed on the existing reinforced concrete column head 1, and the same number of reinforcing steel bars 4 as the column longitudinal bars 6 are prepared. The two ends of each reinforcing steel bar 4 are respectively welded to the steel casing 2 and the corresponding column longitudinal bars 6. The length of each welding point is 200 mm.

[0064] (4) Pour concrete into the cavity formed between the steel casing 2 and the existing reinforced concrete column head 1.

[0065] (5) After the concrete is completely dry, the first mounting member 71 is connected to the steel casing 2 by welding.

[0066] (6) Finally, the steel tie rod 8 is connected to the first mounting member 71 through the second mounting member 72, the third mounting member 73, and the pin 74. The two ends of the second mounting member 72 are connected to the third mounting member 73 and the steel tie rod 8 through the provided welds.

[0067] After the steel tie rod 8 is installed on the steel casing 2, the load-bearing object to be used is installed on the steel tie rod 8, and the load-bearing object may be a canopy, a sun umbrella, etc.

[0068] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0069] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0070] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

Claims

1. An existing reinforced concrete column head structure, used for fixing a load, characterized in that: The existing reinforced concrete column head structure includes an existing reinforced concrete column head, a bonding material and a steel casing. The steel casing is arranged on the outside of the existing reinforced concrete column head. There is a gap between the steel casing and the existing reinforced concrete column head. The bonding material is filled in the gap to connect the steel casing and the existing reinforced concrete column head together; the steel casing is connected to the bearing object through an installation component.

2. The existing reinforced concrete column head structure according to claim 1, characterized in that: The steel casing is sleeved on the existing reinforced concrete column head, and the steel casing is connected to the bonding material; the existing reinforced concrete column head is arranged on the inner side surface of the steel casing, and the installation assembly is arranged on the outer side surface of the steel casing.

3. The existing reinforced concrete column head structure according to claim 2, characterized in that: A reinforcing steel bar is arranged between the existing reinforced concrete column head and the steel casing, one end of the reinforcing steel bar is connected to the inner side of the steel casing, the other end of the reinforcing steel bar is connected to the inside of the existing reinforced concrete column head, and the middle part of the reinforcing steel bar is arranged in the bonding material.

4. The existing reinforced concrete column head structure according to claim 3, characterized in that: The existing reinforced concrete column head is provided with column longitudinal bars having the same number as the reinforcing steel bars, and the column longitudinal bars are connected to the ends of the reinforcing steel bars.

5. The existing reinforced concrete column head structure according to claim 4, characterized in that: The length of the reinforcing steel bar connected to the steel casing and each of the column longitudinal bars is not less than ten times the diameter of the reinforcing steel bar.

6. The existing reinforced concrete column head structure according to claim 2, characterized in that: The cross-sectional length of the existing reinforced concrete column head is A, and the cross-sectional width is B; the cross-sectional length of the steel casing is A+2*X, and the cross-sectional width is B+2*Y; wherein, X and Y are not less than 100 mm.

7. The existing reinforced concrete column head structure according to claim 6, characterized in that: The inner side surface of the steel casing is provided with a plurality of shear keys, and the plurality of shear keys are evenly connected to the inner side surface of the steel casing.

8. The existing reinforced concrete column head structure according to claim 1, characterized in that: The mounting assembly includes a first mounting member, a second mounting member, a third mounting member and a pin shaft. The first mounting member is connected to the steel casing, and the first mounting member is hinged to one end of the third mounting member through a pin shaft. The other end of the third mounting member is connected to one end of the second mounting member. The other end of the second mounting member is connected to a steel pull rod, and the steel pull rod is used to connect the load-bearing object.

9. The existing reinforced concrete column head structure according to claim 1, characterized in that: The installation assembly includes a weld and a pin, and the steel sleeve is connected to the bearing object through the weld and the pin.

10. A method for manufacturing an existing reinforced concrete column head structure, used for manufacturing the existing reinforced concrete column head structure as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: (a) removing the surface of the existing reinforced concrete column head along the circumferential direction of the existing reinforced concrete column head until the longitudinal reinforcement of the column is completely exposed, while retaining a complete section of the existing column head; (b) roughening the surface of the removed steel bar concrete column head, removing loose impurities from the removed surface of the existing steel bar concrete column head, and rinsing with clean water; (c) a steel casing is installed on the existing reinforced concrete column head, and the same number of reinforcing steel bars as the column longitudinal bars are prepared, and the steel casing and the corresponding column longitudinal bars are welded at both ends of each reinforcing steel bar, and the length of each weld is 200 mm; (d) pouring concrete into the cavity formed between the steel casing and the existing reinforced concrete column head; (e) After the concrete is completely dry, the first mounting piece is welded to the weld of the steel casing; (f) The first mounting member is hingedly connected to the third mounting member through a pin shaft, the weld on the third mounting member is welded to one end of the second mounting member, and the other end of the second mounting member is connected to the steel pull rod through a set weld.

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