Hand hole connecting device of precast beam or precast column, preparation method and connecting method

Abstract

The invention provides a hand hole connecting device of a precast beam or a precast column, a preparation method and a connecting method. The hand hole connecting device is connected with the precast beam or the precast column through the inserting piece, a space for a hand or a tool to conduct bolt connection operation is provided through the hand hole piece, a threaded hole is formed, a bolt can penetrate through the threaded hole, and the hand hole connecting device and the precast beam or the precast column are fixed into an integrated structure in the concrete pouring process. During actual construction operation, connection of the prefabricated beam column components is achieved through bolt connection. The connecting device is simple in structure and low in cost, the connecting device can be integrally formed with a prefabricated beam or a prefabricated beam, the forming preparation method is simple and easy to operate, the operation of connecting the prefabricated beam column through the hand hole connecting device is simple, construction is convenient and efficient, formed connection is stable and reliable, and the hand hole connecting device has good application prospects in the technical field of civil engineering production.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering production, and particularly to a handhole connection device, a preparation method and a connection method for precast beams or precast columns. Background Art

[0002] Precast beam or precast column structures are precast beam and column members cast with concrete in molds, and are hoisted to the construction site for installation and splicing during actual construction. How to complete the installation connection safely, conveniently and efficiently, and have high connection stability after installation has always been a research topic in the technical field of civil engineering. Summary of the Invention

[0003] The present invention provides a handhole connection device for precast beams or precast columns, which has a simple structure. The precast beam or precast column with this handhole connection device can be integrally formed. When installed and connected at the construction site, bolt connection is adopted, and the connection operation is safe, convenient and efficient, and the connection stability of the connected beam and column members is high.

[0004] The technical solution provided by the present invention is: a handhole connection device for precast beams or precast columns. The precast beam and the precast column are respectively beam and column members cast with concrete in molds. The handhole connection device includes an insert and a handhole member;

[0005] One end of the insert is inserted into the precast beam or precast column, and the other end is fixedly connected to the handhole member;

[0006] The handhole member includes a hollow space into which a human hand or a tool can reach and bolt connection can be performed. This hollow space is denoted as a hollow part;

[0007] The handhole member includes a first connecting plate, and the first connecting plate is provided with a first threaded hole for screwing a screw in or out. A human hand or a tool can screw the screw in or out of the first threaded hole in the hollow part.

[0008] The structure of the hollow part is not limited. As a implementation manner, the hollow part is composed of a first connecting plate, a second connecting plate and a third connecting plate; the first connecting plate, the second connecting plate and the third connecting plate are connected to each other to form a hollow space. In this structure, as a implementation manner, the second connecting plate and the third connecting plate are respectively fixedly connected to the other end of the insert, and the second connecting plate and the third connecting plate form a certain included angle, and the first connecting plate is located between the second connecting plate and the third connecting plate.

[0009] The structure of the insert is not limited, and preferably it is in the form of a plate, rod, strip, etc. that is easy to insert into a precast beam or precast column. In order to improve the connection stability between the handhole connection device and the precast beam or precast column, it is advisable that the insertion length of the insert is relatively large. The material of the insert is not limited. In order to improve the connection strength between the handhole connection device and the precast beam or precast column, the insert preferably uses a material with relatively high mechanical properties, such as high-strength steel bars, etc.

[0010] As an implementation method, the precast beam or precast column includes a steel reinforcement cage, and the insert is inserted into the steel reinforcement cage along the length direction of the steel reinforcement cage. In order to better combine with the precast beam or precast column, the insert includes a tail bar. As an implementation method, the tail bar is welded to the second connecting plate or the third connecting plate for anchoring inside the precast beam or precast column, which is convenient for on-site construction. Preferably, the first connecting plate is perpendicular to the length direction of the steel reinforcement cage. As a further preference, the first connecting plate is perpendicular to the third connecting plate, one end of the tail bar is fixedly connected to the third connecting plate, and the other end is inserted into the steel reinforcement cage.

[0011] In order to improve the strength of the bolt connection, preferably, the first connecting plate is provided with a through hole along the thickness direction, and a first steel column is arranged in the through hole. The structure of the first steel column matches the structure of the through hole, so that a close contact is formed between the outer periphery of the first steel column and the inner wall of the through hole; the first steel column is provided with the first threaded hole for the screw rod to be screwed in or out.

[0012] The present invention also provides a preparation method for integrally forming a precast beam or precast column with the handhole connection device. The precast beam or precast column includes a steel reinforcement cage, and the preparation method includes the following steps:

[0013] (1) Insert the insert of the handhole connection device into at least one end of the steel reinforcement cage;

[0014] Design a filler according to the hollow part. The filler can be placed in the hollow part to prevent the cast-in-place concrete from blocking the hollow part, and the filler is provided with a space through which the screw rod can pass; place the filler in the hollow part;

[0015] (2) Hoist the steel reinforcement cage and the handhole connection device processed in step (1) into the mold;

[0016] The mold is a container with an open upper end for pouring concrete;

[0017] In the mold, one end close to the handhole connection device is detachable, and this end is denoted as the mold end; the mold end is provided with a second threaded hole, and the aperture of the second threaded hole is equal to the aperture of the first threaded hole;

[0018] Adjust the position of the steel reinforcement cage and the handhole connection device in the mold so that the first threaded hole is directly opposite the second threaded hole. Pass the screw through the filler and then through the first threaded hole, and then through the second threaded hole. Finally, use a matching nut to fix it at the end of the mold.

[0019] (3) Fill the foaming agent around the filler in the mold to prevent the concrete from blocking the hollow part and facilitate disassembly. Then, pour the concrete from the upper end of the mold. After reaching the set strength, loosen the nut at the end of the mold, remove the end of the mold, the bolt and the filler. The filler can be reused.

[0020] The filler can be placed into the hollow part to prevent the cast concrete from blocking the hollow part, and its structure is not limited. Preferably, the part of the filler placed in the hollow part matches the structure of the hollow part and can fill the space of the hollow part.

[0021] In actual preparation, process the corresponding mold according to the detailed design drawings of the precast beam or precast column. The material of the mold is not limited. To improve the load-bearing strength of the mold, it is preferably a steel mold, that is, the mold is composed of steel plates. Preferably, the steel plates are connected by bolts.

[0022] According to actual needs, the handhole connection device is provided at one end or both ends of the steel reinforcement cage. And, the number of handhole connection devices provided at each end is not limited, and several handhole connection devices can be set according to actual needs. Correspondingly, several second threaded holes are provided at the end of the mold, which correspond to the first threaded holes of the handhole connection device one by one.

[0023] To improve the bolt positioning, a second steel column with a third threaded hole is provided in the filler. In step (1), when the filler is placed in the hollow part, adjust the position so that the third threaded hole is directly opposite the first threaded hole. In step (2), the screw first passes through the third threaded hole of the second steel column, then through the first threaded hole and then through the second threaded hole, and finally uses a matching nut to fix it at the end of the mold. Preferably, the aperture of the third threaded hole is equal to the aperture of the first threaded hole.

[0024] When the precast beam with the handhole connection device is connected to the precast column with the handhole connection device, bolt connection is used. That is, in the hollow part of the handhole connection device of the precast beam, pass the screw of the bolt through the first threaded hole, and then through the first threaded hole of the handhole connection device of the precast column, and use a matching nut to fix it in the hollow part of the handhole connection device of the precast column; or, in the hollow part of the handhole connection device of the precast column, pass the screw of the bolt through the first threaded hole, and then through the first threaded hole of the handhole connection device of the precast beam, and use a matching nut to fix it in the hollow part of the handhole connection device of the precast beam.

[0025] When the precast beam with the handhole connecting device is connected to other precast columns, bolt connection is adopted. The precast column includes a connecting device, and the connecting device is provided with a fourth threaded hole, and the aperture of the fourth threaded hole is equal to the aperture of the first threaded hole; the screw rod of the bolt passes through the first threaded hole in the hollow part of the handhole connecting device of the precast beam, then passes through the fourth threaded hole of the precast column, and finally is fixed with a matching nut.

[0026] When the precast column with the handhole connecting device is connected to other precast beams, bolt connection is adopted. The precast beam includes a connecting device, and the connecting device is provided with a fifth threaded hole, and the aperture of the fifth threaded hole is equal to the aperture of the first threaded hole; the screw rod of the bolt passes through the first threaded hole in the hollow part of the handhole connecting device of the precast column, then passes through the fifth threaded hole of the precast beam, and finally is fixed with a matching nut.

[0027] Compared with the prior art, the present invention adopts a handhole connecting device as the connecting device of the precast beam or precast column. The handhole connecting device connects the precast beam or precast column through an insert, provides a space for manual or tool bolt connection operation through a handhole part, and is provided with a threaded hole through which the screw rod of the bolt can pass. During the concrete pouring process, the handhole connecting device is fixed to the precast beam or precast column as an integral structure. During actual construction operations, the connection of precast beam and column members is realized through bolt connection. The handhole connecting device has a simple structure, low cost, can be integrally formed with the precast beam or precast column, and the forming preparation method is simple and easy to operate. The operation of using the handhole connecting device for precast beam and column connection is simple, the construction is convenient and efficient, and the formed connection is stable and reliable, and has good application prospects in the field of civil engineering production technology. Description of the Drawings

[0028] Figure 1 It is a schematic structural diagram of the handhole part connecting device of the precast beam in the embodiment of the present invention.

[0029] Figure 2 It is a schematic structural diagram during the preparation of the precast beam with the handhole part connecting device in the embodiment of the present invention.

[0030] Figure 3 is Figure 2 a schematic structural diagram of the side of the mold end in

[0031] Figure 4 is Figure 2 a schematic structural diagram of the filling part in

[0032] Figures 1 - 4 The numerical markings in

[0033] insert 10, tail reinforcement 11;

[0034] Manhole part 20, hollow part 21, first connecting plate 22;

[0035] Bolt 30, screw rod 31, nut 32;

[0036] Filling part 40, second steel column 41;

[0037] Prefabricated beam 50, steel reinforcement cage 51;

[0038] Mold 60, mold end 61;

[0039] Second connecting plate 211, third connecting plate 212;

[0040] First threaded hole 221, perforation 222, first steel column 223;

[0041] Third threaded hole 411;

[0042] Second threaded hole 611. Detailed implementation mode

[0043] The present invention will be further described in detail below in conjunction with embodiments. It should be noted that the following embodiments are intended to facilitate the understanding of the present invention, and any non-essential improvements and adjustments made by those skilled in the art based on the content of the present invention still fall within the protection scope of the present invention.

[0044] In the present invention, the use of words such as "including" and "comprising" should be interpreted as having an inclusive meaning rather than an exclusive or exhaustive meaning, that is, it means "including but not limited to".

[0045] In the present invention, the expressions such as "first", "second", and "third" can modify various constituent elements, have nothing to do with the order and / or importance, and are only used to distinguish one constituent element from another, and do not limit the corresponding constituent elements.

[0046] This embodiment provides a connecting device for a manhole part of a prefabricated beam.

[0047] As Figure 1 shown, the manhole connecting device includes an insert 10 and a manhole part 20.

[0048] One end of the insert 10 is inserted into the prefabricated beam 50, and the other end is fixedly connected to the manhole part 20.

[0049] The manhole part 20 includes a hollow space that can be reached by a human hand or a tool and can be bolted, and this hollow space is denoted as the hollow part 21.

[0050] The manhole part further includes a first connecting plate 22, as Figure 2As shown, the first connecting plate 22 is provided with a first threaded hole 221 for the screw rod 31 of the bolt 30 to be screwed in or out. A person's hand or a tool can screw the screw rod 31 in or out of the first threaded hole 221 in the hollow part 21. The bolt 30 refers to a fastener used with a nut 32 and consists of two parts, a head and a screw rod 31. Figure 2 In Figure 2 , the bolt 30 is a schematic diagram and the head is not shown. Those skilled in the art understand that it has a head.

[0051] In this embodiment, the precast beam 50 includes a steel reinforcement cage 51, and the insert 20 is inserted into the steel reinforcement cage 51 along the length direction of the steel reinforcement cage 51. The insert 20 adopts a long strip structure that is easy to insert into the precast beam 50 and high-performance steel bars are selected; moreover, the insert includes a tail bar 11, and the tail bar 11 is welded to the third connecting plate 212 for anchoring inside the precast beam 50 to facilitate on-site construction.

[0052] In this embodiment, the hollow part 21 is composed of a first connecting plate 22, a second connecting plate 211 and a third connecting plate 212. The second connecting plate 211 and the third connecting plate 212 are respectively fixedly connected to the other end of the insert 10, and the third connecting plate 212 is parallel to the other end of the connected insert 10, and the second connecting plate 211 forms a certain angle with the other end of the insert 10. The first connecting plate 22 is located between the second connecting plate 211 and the third connecting plate 212 and is perpendicular to the third connecting plate 212. In order to improve the load-bearing capacity of the hollow part, the first connecting plate 22, the second connecting plate 211 and the third connecting plate 212 are made of 30-mm-thick steel plates, and the connecting parts are welded.

[0053] In order to improve the strength of the bolt connection, in this embodiment, as Figure 2 、 3 shown, the first connecting plate 21 is provided with a perforation 222 with an inner diameter of 39 mm along the thickness direction. A first steel column 223 is arranged in the perforation 222. The structure of the first steel column 223 matches the structure of the perforation 222 and has a diameter of 39 mm, so that the periphery of the first steel column 223 is in close contact with the inner wall of the perforation 222. The first steel column 223 is provided with a first threaded hole 221 for the screw rod 31 to be screwed in or out.

[0054] In this embodiment, as Figure 2 shown, the preparation method of the precast beam 50 with the handhole connection device includes the following steps:

[0055] (1) Insert the insert 10 of the handhole connection device into at least one end of the steel reinforcement cage 51 along the length direction of the steel reinforcement cage 51. In this embodiment, the handhole connection device is arranged at one end or both ends of the steel reinforcement cage 51. Moreover, as Figure 3 shown, four handhole connection devices are arranged at each end.

[0056] Design a filling piece 40 according to the hollow part 21. As Figure 2 shown, the filling piece 40 can be placed in the hollow part 21 to prevent the cast concrete from blocking the hollow part 21. In this embodiment, the filling piece 40 is as Figure 4 shown, and a space through which the screw rod 31 can pass is provided. Place the filling piece 40 in the hollow part 21.

[0057] In this embodiment, in order to improve the positioning of the bolt 30, as Figure 4 shown, a second steel column 41 is provided in the filling piece 40, and a third threaded hole 411 is provided in the second steel column 41. The aperture of the third threaded hole 411 is equal to the aperture of the first threaded hole 221. In this embodiment, the diameter of the screw rod 31 is 20 mm, the inner diameter of the first threaded hole 221 is 20 mm, and the inner diameter of the third threaded hole 411 is 20 mm. When placing the filling piece 40 in the hollow part 21, adjust the position so that the third threaded hole 411 is aligned with the first threaded hole 221.

[0058] (2) Hoist the steel reinforcement cage 51 and the handhole connection device processed in step (1) into the mold 60. Process the corresponding mold 60 according to the deepened design drawing of the precast beam. The mold 60 is a container with an open upper end for casting concrete. The material of the mold 60 is not limited. In order to improve the load-bearing strength of the mold 60, a steel mold is selected in this embodiment, that is, the mold 60 is composed of steel plates with a thickness of 6 mm, and the steel plates are connected by bolts.

[0059] In the mold 60, one end close to the handhole connection device is detachable, and this end is denoted as the mold end 61; the mold end 61 is provided with a second threaded hole 611 with an inner diameter of 20 mm. In this embodiment, corresponding to the four handhole connection devices inserted in the steel reinforcement cage 51, the mold end 61 is provided with four second threaded holes 611 for one-to-one correspondence with the first threaded holes 221 of the handhole connection devices.

[0060] First pass the screw rod 31 through the third threaded hole 411, then through the first threaded hole 221, then through the second threaded hole 611, and finally use the matching gasket nut 32 to fix the bolt 30 at the mold end 61.

[0061] (3) Fill the foaming agent around the filling piece 40 in the mold 60 to prevent the concrete from blocking the hollow part 21; then, pour the concrete from the upper end of the mold 60. After reaching the set strength, loosen the nut 32 at the mold end 61, remove the mold end 61, disassemble the bolt 30 and the filling piece 40, and this filling piece 40 can be reused, for example, reused in the preparation of precast beams with the handhole connection device.

[0062] The preparation method of the precast column with the handhole connection device is the same as the preparation method of the precast beam with the handhole connection device described above.

[0063] When the precast beam with the handhole connection device is connected to the precast column with the handhole connection device, bolt connection is adopted. That is, a bolt is passed through the first threaded hole in the hollow part of the handhole connection device of the precast beam, and then through the first threaded hole of the handhole connection device of the precast column. A matching nut is used to fix the bolt in the hollow part of the handhole connection device of the precast column; alternatively, a bolt is passed through the first threaded hole in the hollow part of the handhole connection device of the precast column, and then through the first threaded hole of the handhole connection device of the precast beam. A matching nut is used to fix the bolt in the hollow part of the handhole connection device of the precast beam.

[0064] When the precast beam with the handhole connection device is connected to other precast columns, bolt connection is adopted. The precast column includes a connection device, and the connection device is provided with a fourth threaded hole, and the aperture of the fourth threaded hole is equal to the aperture of the first threaded hole; a bolt is passed through the first threaded hole in the hollow part of the handhole connection device of the precast beam, and then through the fourth threaded hole of the precast column, and finally a matching nut is used to fix the bolt.

[0065] When the precast column with the handhole connection device is connected to other precast beams, bolt connection is adopted. The precast beam includes a connection device, and the connection device is provided with a fifth threaded hole, and the aperture of the fifth threaded hole is equal to the aperture of the first threaded hole; a bolt is passed through the first threaded hole in the hollow part of the handhole connection device of the precast column, and then through the fifth threaded hole of the precast beam, and finally a matching nut is used to fix the bolt.

[0066] The above embodiments have described the technical solutions of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, supplements, or substitutions in a similar manner within the scope of the principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A handhole connection device for precast beams or precast columns. The precast beams and precast columns are beam and column members in which concrete is poured in a mold respectively, and it is characterized in that: The handhole connection device includes an insert and a handhole component; One end of the insert is inserted into the precast beam or precast column, and the other end is fixedly connected to the handhole component; The handhole component includes a hollow space into which a human hand or tool can extend and can be bolted, and this hollow space is denoted as the hollow part; The handhole component includes a first connecting plate, and the first connecting plate is provided with a first threaded hole for the screw rod of the bolt to be screwed in or out. A human hand or tool can screw the screw rod into or out of the first threaded hole in the hollow part.

2. The handhole connection device according to claim 1, wherein: The hollow part is composed of a first connecting plate, a second connecting plate and a third connecting plate; The first connecting plate, the second connecting plate and the third connecting plate are connected to each other to form a hollow space.

3. The handhole connection device according to claim 1, characterized in that: The precast beam or precast column includes a steel reinforcement cage, and the insert is inserted into the steel reinforcement cage along the length direction of the steel reinforcement cage.

4. The handhole connection device according to claim 2, characterized in that: The second connecting plate and the third connecting plate are respectively fixedly connected to the other end of the insert; the second connecting plate and the third connecting plate form a certain angle, and the first connecting plate is located between the second connecting plate and the third connecting plate.

5. The handhole connection device according to claim 1, characterized in that: Meet at least one of the following (Ⅰ) to (Ⅳ): (Ⅰ) The insert is in a plate-shaped, strip-shaped or rod-shaped structure; (Ⅱ) The insert is made of steel material; (Ⅲ) The insert includes tail bars; (Ⅳ) The tail bars are fixedly connected to the second connecting plate or the third connecting plate.

6. The handhole connection device according to claim 1, characterized in that: The first connecting plate is provided with a perforation along the thickness direction, and a first steel column is arranged in the perforation. The structure of the first steel column matches the structure of the perforation, so that the periphery of the steel column is in close contact with the inner wall of the perforation; The first steel column is provided with the first threaded hole.

7. A method for preparing a precast beam or precast column with the handhole connection device according to any one of claims 1 to 6, characterized in that: The precast beam or precast column includes a steel reinforcement cage; The preparation method includes the following steps: (1) Insert the insert of the handhole connection device into at least one end of the steel reinforcement cage; Design a filler according to the hollow part. The filler can be placed in the hollow part to prevent the hollow part from being blocked by the poured concrete, and the filler is provided with a space through which the screw rod can pass; place the filler in the hollow part; (2) Hoist the steel reinforcement cage and the handhole connection device processed in step (1) into the mold; The mold is an open-top container for pouring concrete; In the mold, one end where the handhole connection device is close is detachable, and this end is denoted as the mold end; the mold end is provided with a second threaded hole, and the aperture of the second threaded hole is equal to the aperture of the first threaded hole; Adjust the positions of the steel reinforcement cage and the handhole connection device in the mold so that the first threaded hole is aligned with the second threaded hole. Pass the screw rod through the filler, then through the first threaded hole, and then through the second threaded hole, and finally fix it with a matching nut at the mold end; (3) Fill the foaming agent around the filler in the mold to prevent the hollow part from being blocked by the concrete; then, pour the concrete from the upper end of the mold. After reaching the set strength, unscrew the nut at the mold end, remove the mold end, disassemble the bolt and the filler, and the filler can be reused.

8. The preparation method according to claim 7, characterized in that: A second steel column with a third threaded hole is provided in the filling member; in step (1), when the filling member is placed in the hollow portion, the position is adjusted so that the third threaded hole is aligned with the first threaded hole; in step (2), the screw first passes through the third threaded hole of the second steel column, then passes through the first threaded hole and then through the second threaded hole, and finally a matching nut is used to fix it at the end of the mold.

9. The preparation method according to claim 7, characterized in that: Meet at least one of the following (Ⅰ) to (Ⅳ): (Ⅰ) The mold is made of steel plates. (Ⅱ) The steel plates are connected by bolts. (Ⅲ) In step (1), according to actual needs, the handhole connection device is provided at one end or both ends of the steel reinforcement cage. (Ⅳ) According to actual needs, a plurality of handhole connection devices are provided. Correspondingly, a plurality of second threaded holes are provided at the end of the mold, which correspond to the first threaded holes of the handhole connection devices one by one. (V) The aperture of the third threaded hole is equal to the aperture of the first threaded hole.

10. A connection method for a precast beam or precast column prepared by using claim 7, 8 or 9, characterized in that: When the precast beam with the handhole connection device is connected to the precast column with the handhole connection device, bolt connection is adopted, that is, in the hollow portion of the handhole connection device of the precast beam, the bolt passes through the first threaded hole, and then passes through the first threaded hole of the handhole connection device of the precast column, and a matching nut is used to fix it in the hollow portion of the handhole connection device of the precast column; or, in the hollow portion of the handhole connection device of the precast column, the bolt passes through the first threaded hole, and then passes through the first threaded hole of the handhole connection device of the precast beam, and a matching nut is used to fix it in the hollow portion of the handhole connection device of the precast beam; When the precast beam with the handhole connection device is connected to other precast columns, bolt connection is adopted. The precast column includes a connection device, and the connection device is provided with a fourth threaded hole, and the aperture of the fourth threaded hole is equal to the aperture of the first threaded hole; in the hollow portion of the handhole connection device of the precast beam, the bolt passes through the first threaded hole, and then passes through the fourth threaded hole of the precast column, and finally a matching nut is used to fix it. When the precast column with the handhole connection device is connected to other precast beams, bolt connection is adopted. The precast beam includes a connection device, and the connection device is provided with a fifth threaded hole, and the aperture of the fifth threaded hole is equal to the aperture of the first threaded hole; in the hollow portion of the handhole connection device of the precast column, the bolt passes through the first threaded hole, and then passes through the fifth threaded hole of the precast beam, and finally a matching nut is used to fix it.

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