JPS6160958B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining steel materials for shrinkable shaft frames used in tunnel construction and the like.

Conventionally, the common method for joining retractable shaft frame steel materials for tunnel construction has been to overlap side members and crown members made of flanged channel members and tighten them with screws, etc. In this method, since the crown and side members are formed into a flanged groove shape, all of the gravity on the outer wall of the tunnel is applied to the back of the crown and side members, so the joint The force was applied to the entire body, causing damage to the fasteners.
In addition, because joints that are usually made of steel are used to fasten the crown and side members, the joints may become loose after long periods of use. It also had many drawbacks, including the fact that it was a cause of accidents, and that the back parts of the crown and side members were curved toward the inside of the tunnel, making it difficult to perform joint work.

The present invention was developed to solve the above-mentioned drawbacks, and is intended for use in retractable shaft frame materials such as tunnels, etc., in which side members made of flanged channel members and crown members are overlapped and fastened. In the joining method, a rod-shaped steel material is molded into almost the same shape as the cross section of the crown material, and a U-shaped joint fitting is formed with a threaded part at the tip, and a rectangular steel material with small holes drilled at both ends. A flat fixing plate with a protruding surface formed between both holes and a side member having a cutout groove for fixing the fixing plate are provided, a crown member is joined between the side members, and the cutout fixing groove of the side member is installed. A method for joining retractable shaft frame steel materials for tunnel construction, which can improve and strengthen the fitting and tightening of side members and crown members by bolting the joint fittings and the fixing plate through the bolts. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the method of joining the shrinkable shaft frame steel materials for tunnel construction according to the present invention. 1 is a crown material, 1, 2, 2 are side materials, and 4, 4 are leg materials.
Reference numerals 3 and 3 designate joint portions for fastening the side members 2 and 2 to both ends of the crown member 1. Note that 5 is the ground and 6 is the tunnel.

FIGS. 2 and 3 show a diagram of the state in which the crown material and the side material are joined, and an enlarged view of the main body of the joint used for the joining. As shown in this figure, the crown material 1 and side material 2 are made of flanged grooved materials that have been commonly used. If it is curved, it is fixed. As shown in FIG. 3, the joint fitting main body 7 is made of a round steel bar with female threads 8 provided at both ends, and is molded to have substantially the same shape as the cross section of the crown material. In order to tightly fix the fitting body 7 to the back surface and outer surface of the crown material 1, bent portions are provided on both sides, and the inner portion of the back surface is made horizontal. Reference numeral 9 denotes a fixing plate, on which a protruding surface 12 is provided as will be described later. This fixing plate 9 is a plate for fastening the crown member 1 and the side member 2 to the joint fitting main body 7, and is screwed with a bolt 10 via a washer 11.

FIG. 4 is an exploded view of the joining method shown in FIGS. 2 and 3. First, the side member 2 provided with the fixing groove 13 and the crown member 1 are fitted into desired positions as shown in this figure. Next, the two joint fitting bodies 7 are inserted from the back side of the crown material 1, and the respective fixing plates 9, 9 are inserted through the fixing grooves 13, 13 of the side members 2, 2, and are inserted through the washers 11. Screw in with bolt 10.
At this time, the fixing plate 9 is fastened so that the protruding surface 12 fits into the fixing groove 13, as shown in FIG.
As a result, if the bolt 10 is tightened, the fixing plate 9
is fixed in the fixing groove 13, and the fitting main body 7 is in close contact with the crown material 1 and is completely fixed,
The side material 2 and the crown material 1 can be firmly and well joined together.

Since the present invention is configured as described above,
It is possible to improve the compressible resistance performance of the collapsible shaft frame steel used for the crown material and side materials, and also to reduce the compressible sliding property to zero, so the crown material and side materials ( In addition, the main body of the fitting is made into a round bar shape, the central back part is horizontal, and a bent part is provided to increase the strength when tightening. It has many advantages, such as not only being able to hold the bolt, but also retaining elasticity, making it easy to tighten bolts inside the tunnel, and the fitting itself has a simple structure. Because of this, mass production is possible at low cost, and since it can be molded using inexpensive materials, performance, safety,
From all aspects such as strength, economy, workability, and practicality, this method can be said to be an excellent method for joining shrinkable shaft frame steel materials for tunnel construction.

[Brief explanation of the drawing]

Figure 1 is an overall schematic explanatory diagram showing the method of joining the shrinkable shaft frame steel material for tunnel construction of the present invention, Figures 2 and 3 are
The figure is an enlarged view of the joint shown in FIG. 1 and an enlarged sectional view showing the joint fitting used for the joint, and FIG. 4 is an exploded view of the joint fitting used in the present invention. 1... Crown material, 2... Side material, 3... Joint portion, 4...
...Legs, 5...Ground, 6...Tunnel, 7...Joint fitting body, 8...Female thread, 9...Fixing plate, 10...
Bolt, 11...Washer, 12...Protruding surface, 13...
...Fixed groove.

Claims (1)

[Claims] 1. In a method for joining compressible shaft frame materials for tunnels, etc., in which side members made of flanged channel members and crown members are overlapped and fastened, a bar-shaped steel member is formed into approximately the same cross-sectional shape as the crown member. A U-shaped fitting that has been machined and has a threaded part at its tip, a flat fixing plate with small holes drilled at both ends of a rectangular steel material and a protruding surface between both holes, and a fixing plate. A side member having a notched groove for fixing is provided, and a crown member is spliced between the side members,
A method for joining retractable shaft steel materials for tunnel construction, characterized in that a joint fitting and a fixing plate are bolted together through a notched fixing groove in a side member.