JPH0296099A - Tunnel timbering arch shape steel frame and manufacture of tunnel timbering arch shape steel frame - Google Patents

Abstract

PURPOSE:To enhance bearing yield strength by butting joint plates on the front and rear surfaces of the webs of left and right supports butted to both the ends of a ceiling beam, and by inserting bolts through the penetration slots the webs and the joint plates, to be fastened with nuts. CONSTITUTION:A ceiling beam 12 bent to coincide roughly with the ceiling surface of a tunnel and with joint slots bored through webs at both the end sections of an I-shape steel is set. Besides, left and right supports 14a, 14b with an upper end section bent in one direction and with joint slots bored through the webs of the upper end section of the I-shape steel are arranged. Then, joint plates 16 with opening joint slots communicating with the joint slots of the ceiling beam 12 and the left and right supports 14a, 14b are arranged. Besides, to the left and right side ends of the ceiling beam 12, the end surfaces of the left and right supports 14a, 14b are butted, and to the front surface and rear surface of a web 18, the joint plates 16 are butted, and through the joint slots, bolts and nuts are fitted to be fastened.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (1) Field of Industrial Application The present invention relates to an arch-shaped steel frame used for supporting a mine shaft and a method of manufacturing the arch-shaped steel frame.

(2) Prior Art Conventionally, in various mines, supporting members are used to secure the space inside the tunnel when excavating the tunnel face. In the old days, wooden pillars and wooden beams were used as supporting members, but in recent years, wooden stakes, which are logs, are supported by iron frames, which resemble iron beams connected to iron pillars.

(3) Problems to be solved by the invention However, when a steel beam is connected to a steel column, the joint part is easily damaged due to the load applied to it, and the bolt holes in the joint part must be drilled with arc or gas. In some cases, the material of the joint becomes weakened, and it takes time and effort to drill the hole. However, even when ceiling beams or support beams are hot bent, the steel itself becomes weakened, making the tunnel more likely to collapse.

The present invention has been made in view of the above-mentioned problems of the conventional art.The purpose of the present invention is to make the steel frame for supporting the mine shaft elastic and have high strength at the joints between the ceiling beam and the support column, and also to provide a machined structure. An object of the present invention is to provide an arch-shaped steel frame for supporting a mine shaft, which is characterized by easy construction, and a method for manufacturing the same.

1. Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides an arch-shaped joint between a ceiling beam made of Pokal steel and a left and right column. It is a steel frame that is curved to approximately match the ceiling surface of the tunnel, and has a ceiling beam with joint holes drilled in the webs at both ends of the shaped steel, and a ceiling beam whose upper end is bent to one side. , the left and right columns have joint holes drilled in the upper end webs of the engineering shaped steel, and the joint holes that communicate with the joint holes of the ceiling beam and the left and right columns are drilled, and the webs of the ceiling beam and the left and right columns butt. A joint plate for connecting by abutting on the front and rear surfaces of the ceiling beam, and a joint plate for connecting the webs of the left and right columns that abut against both ends of the ceiling beam, and the joint plates are brought into contact with the front and rear surfaces of each other and are fastened with bolts and nuts. It constitutes an arch-shaped steel frame.

However, the present invention also includes a configuration in which the curvature of the upper ends of the left and right pillars is the same as the curvature of the ceiling beam.

Next, as a manufacturing method for the arch-shaped steel frame, a plurality of joint holes are punched symmetrically with respect to the center of the I-shaped steel, which is approximately the same length as the inner circumference of the tunnel, and centered around the cutting position of the support. A hole is opened in the web, and while inserting the above-mentioned ■-shaped steel from one end into a roller bender having a pair of fixed rollers and a pressing roller, from the position of the two sets of joint holes to the center part, it almost coincides with the curved surface of the ceiling of the tunnel. Pressure is applied in the direction of the web so as to bend the steel, and cut the steel section with the central part bent at the center positions of two sets of multiple joint holes, and use the central part as a ceiling beam and the left and right parts as left and right parts. The upper ends of the left and right supports are bent into three parts using a fixed die and a pressing die of a press machine so as to approximately match the curved surface of the upper end of the side wall of the tunnel, leaving one part of the upper ends of the left and right supports. A plurality of joint holes are drilled in the joint plate that is in contact with the web at the butt part, and the left and right support columns are butted against both ends of the ceiling beam, and the joint plate is brought into contact with the front and rear surfaces of the butted web and fastened with bolts and nuts. This method comprises a method for manufacturing an arch-shaped steel frame.

In addition, in the process of drilling a joint hole with the punch punch machine, a pedestal is installed to push the molded steel laterally below the punch that operates up and down, and the top surface of the pedestal is placed on the chevron-shaped plate. A hole positioning means is provided with a plurality of grooves into which the stopper is fitted.The hole positioning means is installed at a specified length from the punch, and the stopper is fitted into the groove of the chevron plate of the positioning means, and one end of the shaped steel is inserted into the stopper. A configuration may be adopted in which a plurality of joint holes are punched using a punch-cutting machine while positioning the joint hole in contact with a plate.

(2) Function In the present invention, the ceiling beam and the left and right support columns are formed of type steel, and joint holes are drilled in the webs at opposite ends of the ceiling beam and the left and right support columns, and the joint holes are formed. A joint plate is brought into contact with the perforated web and fastened with bolts and nuts to form an arch-shaped steel frame for supporting a mine shaft.

The method for manufacturing the arch-shaped steel frame is as follows: (1) A hole for the joint is made in the web using a punching machine at a position where the pillars are cut symmetrically with respect to the center of the steel frame, and then the center portion is made to approximately match the curved surface of the ceiling. The product is made by pressurizing and bending the material, cutting at the cut point to divide the center into a ceiling beam, and the left and right into left and right pillars, and then bending the upper ends of the left and right pillars.

Therefore, the joint hole can be easily opened and the material does not deteriorate.

(3) Embodiments Hereinafter, preferred embodiments of the present invention will be explained with reference to the accompanying drawings.

As shown in FIG. 1, the arch-shaped steel frame 10 for reinforcing a tunnel has a left support 14a and a right support 14b abutted against each other at both ends of a ceiling beam 12 and connected by a joint plate 16.

The ceiling beam 12, left and right columns 14a, 14b are
It is made of Pokal steel and is made of type steel.

As shown in FIG. 4, the ceiling beam 12 is curved with a curvature that matches the ceiling surface of the tunnel 20 with the web 18 in the vertical direction, and two joint holes 22a are opened at both ends of the web 18.

As shown in FIG. 5, a portion of the upper end of the left support 14a is first curved 24 to have the same curvature as the ceiling beam 12 so that the joint plate 16 comes into contact with the web 18 when the left support 14a is connected to the ceiling beam 12. 1st
A second curve 26 is formed at the lower part of the curve 24 with a curvature that matches the upper end surface of the side wall of the tunnel 20.

Two joint holes 22b are formed at the upper end of the web 18.

As shown in FIG. 6, the right column 14b is symmetrical to the left column 14a, and has a first curve 24, a second curve 26, and a joint hole 22b at its upper end.

The joint plate 16 shown in FIG.
In order to connect the webs 14a and 14b, four joint holes 22C are formed in the mouth plate that fits into the web 18.

As shown in FIGS. 2 and 3, the end surface of the left column 14a is butted against the left end of the ceiling beam 12, and the joint plates 16 and 16 are brought into contact with the front and rear surfaces of the web 18, thereby creating a ceiling that communicates with the ceiling beam 12. Beam 1
2 joint holes 22a1, 4 bolt nuts 28 in the joint hole 22b of the left support 14a, and the joint hole 22c of the joint plate 16.16.
It is inserted and tightened. The right support 14b is similarly connected to the right end of the ceiling beam 12. Left and right struts 14a, 14
The first curvature 24 at the upper end of b is the same as the curvature of the ceiling beam 12, so that the joint plate 16 can be brought into contact with the web 18 of the butt portion.

The ceiling beam 12 and the left and right support columns 14a and 14b, which are the constituent pieces of the arch-shaped steel frame 10, are manufactured from one piece of square steel.

In the manufacturing method described above, a square shaped steel 34 having a length substantially equal to the inner circumferential length of a predetermined tunnel 20 is cut. And, Figures 8 to 9
As shown in the figure, first, with the punch 32 of the punch hole punching machine 30, the joint holes 22a at both ends of the ceiling beam 12 are
A joint hole 22b and a joint hole 22b are opened before cutting the type steel 34. For this purpose, the shape steel 34 is placed at the lower position of the punch 32.
A pedestal 36 is provided to allow the slider to slide sideways.

On the upper surface of the pedestal 36 are first hole positioning means 38a for opening four joint holes 22b of the left support 14a and the joint hole 22a of the left end of the ceiling beam 12, and a first hole positioning means 38a for opening four joint holes 22b of the left support 14a and the joint hole 22a of the left end of the ceiling beam 12. A second opening positioning means 38b for opening the four joint holes 22a and the joint hole 22b of the right column 14b is installed at a predetermined length from the punch 32.

The first and second hole positioning means 38a, 38b are
As shown in FIG. 10, grooves 42 for inserting four sets of stoppers are formed in the chevron-shaped plate 40.

Then, below the punch 32 of the punch hole-opening machine 30, lff
1 steel 34 is placed sideways, and the first hole positioning means 38a
A stopper 44 is fitted into the groove 42 of the chevron plate 40 near the punch 32, and the stopper 44 is fitted with the
Abut one end of the joint hole 22a for the left column, then punch the joint hole with the hole puncher 30, and while moving the stopper 44 to the other groove 42, open the four joint holes 22a for the left support column and then the four joint holes 22a for the ceiling beam. Open a hole. Similarly, the second hole positioning means 38b
While regulating one end of the T-shaped steel 34 with the stopper 44 at the position of
Drill a hole.

Next, connect the four joint holes 22a and 22b in succession.
As shown in FIG.
a into the pressing roller 48b from one end, the left position of the four joint holes 22b, 22a on the left side is the bending start point 49a, and the right position of the four joint holes 22a, 22b on the right side is the bending end point 49. It is curved to a curvature that approximately matches the ceiling surface of the tunnel so that it becomes b.

As shown in Figure 13, ■-shaped steel 34 with the central part bent
The four center positions of the left and right joint holes are located at the left cutting line 50a.
, gas cutting is performed using the right cutting line 50b. The cut central member 34a becomes the ceiling beam 12, and the left and right members 34b, 34c
has a first curve 24 whose upper end has the same curvature as the ceiling beam 12, but in order to create a second curve 26 below it, a 14th
As shown in the figure, the left and right members 34b and 34c are pressed between the fixed mold 54a and the pressing mold 54b of the press machine 52, respectively, to form a second curved structure 26, and the left and right columns 14a, 14b are pressed.
This is what is done.

Then, the ceiling beam 12 and the left and right columns 14a and 14b.

Joint plates 16 and the like are mass-produced and transported one by one into the tunnel 20 at the site, assembled and installed as an arch-shaped steel frame 10 at intervals of several meters, and a plurality of stakes are installed in the gap between the ceiling surface of the tunnel 20 and the ceiling beam 12. 56 is inserted to support the inside of the tunnel 20.

■ As explained in detail about the invention, in the arch-shaped steel frame and the manufacturing method of the arch-shaped steel frame according to the present invention, each ceiling beam and left and right columns are formed using Pokal steel IW steel, so the supporting strength is large. In addition, the ceiling beams and left and right columns are cold bent, and the joint holes are also punched out, so the material does not deteriorate and the drilling and bending of the joint holes can be done efficiently. It has the following effects.

[Brief explanation of drawings]

Fig. 1 is a front view showing an arched steel frame according to an embodiment of the present invention, Fig. 2 is an enlarged front view of the joint between the left column and the ceiling beam, and Fig. 3 is a sectional view taken along the line A-A. , Fig. 4 is a partially enlarged front view of the ceiling beam, Fig. 5 is a partially enlarged front view of the left support, Fig. 6 is a partially enlarged front view of the right support, and Fig. 7 is an enlarged front view of the joint plate. , FIG. 8 is a partially enlarged front view showing the punching machine and the mount, FIG. 9 is a partially enlarged front view of the mount showing the positioning means, FIG. 10 is an enlarged plan view thereof, and FIG. 11 is a partially enlarged front view of the mount. 10th
Figure B-B line arrow view, Figure 12 is a partially enlarged plan view of ■-shaped steel bent with a roll bender, Figure 13 is a partially enlarged front view of I-shaped steel bent with a roll bender, and Figure 14. is divided,
FIG. 3 is a partially enlarged plan view showing the upper end of the L6 support column being press-curved using a press machine. 107-chi type steel frame, 12 ceiling beam, 14a, 14b left and right support, 16 joint plate, 22 joint hole, 30 punch hole drill, 34
Pokarue type steel, 36 frame, 38a. 38b hole positioning means, 460-Rubender-52 press machine

Claims (1)

[Claims] 1. A steel frame in which a ceiling beam made of I-type steel and left and right columns are connected in an arch shape with a joint plate, which is curved so as to substantially match the ceiling surface of a tunnel, and made of I-type steel. a ceiling beam with joint holes drilled in the webs at both ends; left and right columns whose upper ends are bent to one side and joint holes drilled in the upper end webs of the I-shaped steel; A joint hole is drilled that communicates with the joint hole of the left and right columns, and a joint plate is provided for connecting the ceiling beam and the left and right columns by abutting on the front and rear surfaces of the butt part of the web. An arch-shaped steel frame for supporting a mine shaft, characterized in that joint plates are brought into contact with the front and rear surfaces of the webs of the left and right columns that butt against each other, and are fastened with bolts and nuts. 2. The arch-shaped steel frame for supporting a mine shaft according to claim 1, wherein the curvature of the upper ends of the left and right supports is the same as the curvature of the ceiling beam. 3 A punch punch machine is used to drill a plurality of joint holes in the web that are symmetrical about the cutting position of the pillar, which is symmetrical with respect to the center of the I-shaped steel, which has approximately the same length as the inner circumference of the tunnel, and then the I-shaped steel is rolled. While inserting into the lavender from one end, pressure was applied in the direction of the web from the position of the two sets of joint holes to the central part so as to approximately match the curved surface of the ceiling of the tunnel, and the central part was curved. Cut the shaped steel at the center positions of two sets of multiple joint holes, divide the center into a ceiling beam, and the left and right sections into left and right columns, leaving a portion of the upper ends of the left and right columns to form the curved surface of the upper end of the side wall of the tunnel. A plurality of joint holes are formed in the joint plate that abuts the webs at the abutting portions of the ceiling beam and the left and right columns, and the left and right columns are butted against both ends of the ceiling beam. A method for manufacturing an arch-shaped steel frame for supporting a mine shaft, characterized in that joint plates are brought into contact with the front and rear surfaces of the web and fastened with bolts and nuts. 4. The step of drilling a joint hole in the web with the punch cutting machine includes installing a frame for pushing the I-shaped steel from below the vertically operating punch to the side;
On the top surface of the mount, a hole positioning means provided with a plurality of grooves in which a stopper is fitted in the chevron-shaped plate is installed at a prescribed length using a punch, and the stopper is fitted into the groove of the chevron-shaped plate of the positioning means. claim 3, further comprising the step of punching a plurality of joint holes with a hole puncher while positioning the I-shaped steel by abutting one end of the I-shaped steel against a stopper. A method of manufacturing an arch-shaped steel frame for shaft support.