H-beam steel connection structure

Abstract

To provide a connection structure of an H-section steel used for rails of a trolley and the like allowing easy connection and allowing connection of flanges of the H-section steels to each other to be leveled.SOLUTION: A connection structure of an H-section steel to make abutment end surfaces of H-section steels 10, comprising two flanges 12a and 12b and a web 13 connecting the flanges to each other, abut against and connect to each other comprises a pair of joint plates 20a and 20b crossing over both of the H-section steels to clamp the web from both sides thereof. The joint plate is almost square, is provided with a plurality of screw holes 21 for adjustment bolts at an end surface of an edge, and has adjustment bolts 30 screwed in the screw holes for adjustment bolts and allowing adjustment of a projecting amount of bolt heads. The joint plate is placed between the two flanges, and not only allow a position to be fixed by bringing an end surface opposite to the end surface provided with the adjustment bolt and the bolt head of the adjustment bolt into contact with the two flanges, but also allows fixation on the web through pressing force using an attachment bolt 40 penetrating through the web.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a connection structure of H-shaped steel used for rails of trolleys installed at construction sites and the like.

Background Art

[0002] At a construction site, a trolley may be used to suspend materials and the like. At that time, a rail for the trolley is assembled using H-shaped steel made of aluminum or the like. FIG. 6 is a reference diagram of a trolley with H-shaped steel as a rail. The H-shaped steel 10 has flanges arranged vertically, and is installed such that the wheels of the trolley 100 are placed on the upper surface of the upper flange. Since the H-shaped steel 10 used for the rail is connected on-site, it is desirable to make the H-shaped steel 10 longer in order to reduce the connection work between the H-shaped steels as much as possible. However, doing so makes the transportation and installation of the H-shaped steel 10 difficult, so it cannot be made too long. Therefore, it is desirable that the connection portion of the H-shaped steel 10 has a strength sufficient to allow the trolley 100 to be used and is as simple as possible.

[0003] Also, in order for the trolley to pass over the H-shaped steel 10 used as a rail, the upper surface of the flange 12a of the connected H-shaped steel needs to be flat. Therefore, it is necessary to avoid a connection structure in which a gusset plate is applied across the butted flanges and bolted, like a general H-shaped steel connection structure.

[0004] Figure 7 shows an example of a joint structure that eliminates flange protrusions (see Patent Document 1). This joint structure eliminates protrusions from flanges 12a and 12b, connecting only the web 13. However, since this joint structure is a joint for structural members, the U-shaped reinforcing plate 80 is firmly fixed to the H-beam by welding 81 or high-strength bolts 82, so the connection structure cannot be said to be simple. Furthermore, the H-beams used for trolley rails installed at construction sites are made of aluminum or have a small cross-section, and are relatively weaker than the H-beams 10c used for structural members. Also, because they are used many times, they may have distortions, and the flanges may be tilted relative to the web. Therefore, if the joint structure described in Patent Document 1 is to be used for trolley rail connections, there may be situations where connection is difficult, such as when the reinforcing plate 80 cannot be inserted between the flanges. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2018-145717 [Overview of the project] [Problems that the invention aims to solve]

[0006] In view of these circumstances, the present invention aims to provide a connection structure for H-shaped steel beams used in trolley rails and the like at construction sites, which is easy to connect and allows the flanges of the H-shaped steel beams to be connected flat. [Means for solving the problem]

[0007] The H-beam connection structure according to the present invention is an H-beam connection structure that connects the end faces of H-beams, which consist of two flanges and a web connecting the flanges, by butting them together, and has a pair of joint plates that straddle the H-beams and sandwich the web from both sides, the joint plates are substantially rectangular and have a plurality of screw holes for adjustment bolts on one end face, and have adjustment bolts that are screwed into the screw holes for adjustment bolts and whose bolt head protrusion amount can be adjusted, the joint plates are positioned between the two flanges and have a structure that allows the end face opposite to the end face on which the adjustment bolts are provided and the bolt heads of the adjustment bolts to abut against the two flanges respectively and be fixed in position, and is characterized in that it is pressed and fixed to the web using mounting bolts that penetrate the web.

[0008] Here, one joint plate sandwiching the web is provided with a countersunk hole, and the other opposing joint plate is provided with a screw hole for a mounting bolt. The mounting bolt that passes through the web is a countersunk bolt, and the countersunk bolt passes through the web from the countersunk hole and is screwed into the screw hole for the mounting bolt. Also, the H-beam may have two parallel webs. Adjusting Bo It is preferable that the corners of the bolt heads of the bolts are notched, and furthermore, the web-side corners of the end face of the joint plate that abuts against the flange are also notched. [Effects of the Invention]

[0009] The present invention offers the advantage of easily connecting H-shaped steel beams to each other. Furthermore, since the joint plate is positioned between two flanges and its end face and adjustment bolt can be fixed in place by contacting the flanges, the connection between H-shaped steel beams can be made strong and easy, and it also contributes to maintaining the flatness of the flanges of the connected H-shaped steel beams.

[0010] Furthermore, by providing notches on the end faces of the joint plates and the bolt heads of the adjustment bolts, interference between the flange and web of the H-beam can be avoided with the joint plates and adjustment bolts, making it possible to firmly contact the joint plates with the flange and web. [Brief explanation of the drawing]

[0011] [Figure 1] A perspective view and a cross-sectional view of an H-shaped steel beam, where (a) has one web and (b) has two webs. [Figure 2] This is a joint plate used in the connection structure of the present invention. [Figure 3] This is a front view of the connection structure. [Figure 4] This is a cross-sectional view of the connection structure. [Figure 5] This diagram illustrates the notches in the joint plate and adjustment bolt. [Figure 6] This is a reference diagram of a trolley using H-shaped steel rails. [Figure 7] This is an example of a joint structure that eliminates flange protrusions. [Modes for carrying out the invention]

[0012] This invention relates to a connection structure for H-shaped steel used in trolley rails and the like at construction sites. Embodiments of the present invention will be described below with reference to the attached drawings.

[0013] The connection structure of the present invention connects H-shaped steel beams of the same shape by butting their end faces together. Figure 1 shows a perspective view and a cross-sectional view of an H-shaped steel beam using the connection structure of the present invention, where (a) has one web and (b) has two webs. The size and material of the H-shaped steel beams connected by the present invention can vary and are not particularly limited, but the H-shaped steel beams 10a and 10b used for trolley rails erected at typical construction sites are approximately 100 mm x 100 mm in size and made of aluminum or similar material. Note that the H-shaped steel beams can be either rolled H-beams or built H-beams.

[0014] Figure 1(a) shows a typical H-beam 10a, in which the centers of opposing flanges 12a and 12b are connected by a web 13. Figure 1(b) shows an H-beam 10b with two parallel webs 13. Such an H-beam 10b is highly resistant to twisting and excellent at maintaining the flatness of the flanges 12a and 12b, making it suitable for use as a trolley rail. In addition, the bolt through holes 14 for the mounting bolts used for connection pass through the webs 13 of the H-beams 10a and 10b. In this embodiment, four bolt through holes 14 are drilled in a row on each side of the H-beams 10a and 10b, but this is an example, and the number and arrangement of bolt through holes 14 should be determined according to the size of the H-beam. Also, the diameter of these bolt through holes 14 should be slightly larger than the size of the bolts used.

[0015] Figure 2 shows a joint plate used in the connection structure of the present invention. A pair of joint plates 20a and 20b straddle two H-shaped steel beams whose end faces are butted together as shown in Figure 1, and are positioned between two flanges 12a and 12b, sandwiching the web 13 from both sides and being pressed against the web 13 using mounting bolts.

[0016] The joint plates 20a and 20b are roughly rectangular in shape and have multiple screw holes 21 for adjustment bolts on one end face, with adjustment bolts 21 that are screwed into these screw holes 21. By rotating these adjustment bolts 21, the amount of protrusion of the bolt heads from the end faces of the joint plates 20a and 20b can be adjusted.

[0017] Figure 3 is a front view of the connection structure. Figure 4 is a cross-sectional view of the connection structure. The joint plates 20a and 20b can be fixed in position by bringing the end face opposite to the end face on which the adjustment bolt 21 is provided, and the bolt head of the adjustment bolt 30 into contact with the two flanges 12a and 12b, respectively. Here, the amount of protrusion of the bolt head of the adjustment bolt 30 can be adjusted by rotating the screw, so with one end face of the joint plates 20a and 20b in contact with flange 12a, the amount of protrusion of the adjustment bolt 30 can be adjusted and the joint plates 20a and 20b can be firmly fitted and fixed between the two flanges 12a and 12b.

[0018] When pressing and fixing the joint plates 20a and 20b to the web 13, a mounting bolt 40 penetrating the web 13 is used. The size and type of the mounting bolt 40 are not particularly limited, but a countersunk bolt of about M16 is preferred so as not to interfere with the trolley. A countersunk hole 25 is provided in one joint plate 20a, and a threaded hole 26 for the mounting bolt is provided in the other opposing joint plate 20b. By inserting a countersunk bolt 40 that penetrates the countersunk hole 25 and the bolt through-hole 14 formed in the web 13 into the threaded hole 26 for the mounting bolt and tightening the bolt, the joint plates 20a and 20b can be pressed and fixed to the web 13. Note that the mounting bolt 40 may have a configuration using a bolt nut or the like without using a countersunk hole or a threaded hole for the mounting bolt as long as it does not interfere with the trolley.

[0019] As described above, the joint plates 20a and 20b are firmly fixed to any of the flanges 12a and 12b and the web 13 by using the adjustment bolt 30 and the mounting bolt 40. Therefore, even if only the webs 13 are connected to each other, the connection structure is strong. In addition, since the positioning of the joint plates 20a and 20b can be performed by using the adjustment bolt 30, the connection work can be easily performed.

[0020] In addition, the H-shaped steel 10a used for the rails of the trolley is not very strong and is repeatedly used, so some of them are distorted in shape. For example, there may be a case where the gap between the two flanges 12a and 12b is different on the left and right sides of the web 13. At that time, by inserting the joint plates 20a and 20b according to the present invention into a narrow portion between the two flanges 20a and 20b and rotating the adjustment bolt 30, the space between the flanges 20a and 20b can be expanded, and the distance between the two flanges 20a and 20b can be adjusted to be approximately the same. As a result, it is possible to flatten the upper surfaces of the flanges of the abutting H-shaped steels.

[0021] Furthermore, if fillet welds or rolling-induced protrusions 15 remain at the corners of the joint between the two flanges 12a and 12b of the H-beams 10a and 10b and the web 13, the bolt heads of the adjustment bolts 30 and the end faces of the joint plates 20a and 20b may interfere with these protrusions 15. This could result in the joint plates 20a and 20b not being able to make tight contact with the flanges 12a and 12b or the web 13. Therefore, it is advisable to make notches in the corners of the bolt heads of the joint plates 20a and 20b and the adjustment bolts 30. Figure 5 illustrates the notches in the joint plates and adjustment bolts. Adjusting Bo It is preferable to provide notches 32 at the corners of the bolt heads of the bolt 30, and also notches 28 at the web-side corners of the end faces of the joint plates 20a and 20b that abut the flanges 12a and 12b. The notches 28 and 32 may be straight-lined corners or curved surfaces with a radius of approximately R30.

[0022] By using the H-beam connection structure described above, trolley rails can be installed easily and securely on site. As a result, even if the number of connection points increases, the work is simple, eliminating the need to use longer H-beams and reducing the labor involved in transporting and installing H-beams on site. [Explanation of Symbols]

[0023] 10, 10a, 10b, 10c H-beam steel 12a, 12b flanges 13 Web 14 bolt through holes 15 Convex part 20a, 20b Joint plate 21 Screw holes for adjustment bolts 22 End face of joint plate 25 Countersink 26 Threaded holes for mounting bolts 28 Notches 30 Adjustment bolt 31 Bolt head 32 Notches 40 Mounting bolts

Claims

1. An H-beam connection structure that connects the end faces of an H-beam, which consists of two flanges and a web connecting the flanges, by butting them together. The H-shaped steel beams are provided with a set of joint plates that straddle each other and sandwich the web from both sides, The aforementioned joint plate is roughly rectangular and has multiple screw holes for adjustment bolts on one end face, and has an adjustment bolt that is screwed into the screw hole for the adjustment bolt and whose bolt head protrusion amount can be adjusted. The H-beam connection structure is characterized in that the joint plate is positioned between the two flanges, and its end face opposite to the end face on which the adjustment bolt is provided, and the bolt head of the adjustment bolt, are in contact with the two flanges to fix its position, and it is pressed and fixed to the web using mounting bolts that penetrate the web.

2. The H-shaped steel connection structure according to claim 1, wherein one of the joint plates sandwiching the web is provided with a countersunk hole, and the other opposing joint plate is provided with a screw hole for a mounting bolt, and the mounting bolt that penetrates the web is a countersunk bolt, and the countersunk bolt penetrates the web through the countersunk hole and is screwed into the screw hole for the mounting bolt.

3. The H-shaped steel connection structure according to claim 1, characterized in that two parallel webs are provided.

4. The H-beam connection structure according to claim 1, characterized in that the corner of the bolt head of the adjustment bolt is notched, and further, the corner on the web side of the end face of the joint plate that abuts the flange is notched.

Images