JP3002545U - Tunnel support rebar structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a tunnel support rebar structure that can perform waterproofing with excellent watertightness that can completely stop water around the screw part. [Structure] A flanged insert screw 9 having a front end convex screw portion 12 and a rear end concave screw portion 13 of a main body 10 is isolated and cut off, and the screw portion 12 is screwed into a concave screw hole 6 of a concrete anchor 4. The waterproof sealing sheet 7 which has been intervened by the sealing sealing packing 8 on both sides of the flange 11,
Set it on the concrete anchor 4 so that it is pressed by 5, and then insert the flanged insert screw 9
In addition, the deformed round bar 1 which is the support rebar of the secondary lining bar 16
It is set by screwing in 4. [Effect] Even if the water pressure is 5 Kgf / cm ² or more, it cannot permeate and leak, and stable and strong water tightness is guaranteed. Moreover, since the leakage of water from the upper part around the threaded portion 15 of the deformed round bar 14 which is the support rebar is blocked off, the secondary lining of the seepage water from the natural ground 1 is prevented from permeating the concrete and completely stopped. Provides excellent waterproofing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tunnel support rebar structure capable of preventing water leakage around the threaded portion of a deformed round bar which is a support rebar for secondary lining concrete reinforcement.

[0002]

[Prior art]

 Underground utilization has recently advanced tremendously, and tunnels are not limited to roads and railways, but tunnels are being used in all fields such as oil storage and vegetable storage tunnels through waterways. In the currently used tunnel construction method, as shown in FIGS. 3 and 4, the tunnel 2a space is excavated in the underground ground 1a, and immediately the primary lining concrete 3a is sprayed to protect the surface of the tunnel 2a. A high-performance resin waterproof sheet 7a is attached. Then, when the waterproof sheet 7a has been attached, a hole is drilled through the waterproof sheet 7a by drilling into the natural ground 1a, and the concrete anchor 4a is driven therein, and fitted into the concave screw hole 6a of the concrete anchor 4a. The deformed round bar 14a having the screw portion 15a is screwed in. At this time, stack the sealing packing 8a such as butyl rubber on the waterproof sheet 7a, press it down with the washer 8b, and press the hexagonal nut 9a onto the screw 15a to press the sealing packing 8a through the washer 8b. It is tightened. The deformed round bar 14a is used as a support rebar for the secondary lining bar 16a of the secondary lining concrete 17a which extends downward and is placed inside the waterproof sheet 7a.

[0003]

[Problems to be solved by the device]

 However, there is a very large water pressure in places where the groundwater level is extremely deep such as 50m or 60m, and there is usually no groundwater, but after long rains such as the rainy season, the groundwater becomes large. Act on the tunnel. For example, water is 1m ³ It is 1 ton, so 50m / m if all water is 50m underground²It means that there is water pressure. Therefore, water leaks inside the tunnel 2a along the threaded portion 15a of the deformed round bar 14a penetrating the waterproof sheet 7a. However, in the conventional method, the water leaked to the surface of the waterproof sheet 7a is not leaked because it is held down by the butyl rubber sealing packing 8a and the washer 8b. However, in order to prevent water leakage around the elbow of a water pipe, etc. by winding a screw seal along the thread groove, it is necessary to prevent water leakage in the peripheral threaded portion 15a of the deformed round bar 14a. It is clear that just screwing in will leak water from around the screw.

The reason why the waterproof sheet 7a is attached to the inside of the primary lining concrete 3a is to block the permeated water from the natural ground 1a so as not to pass into the secondary lining concrete 17a. It will be a problem if there is permeated water that passes through the waterproof sheet 7a along the deformed round bar 14a which is a reinforcing bar. In the past, since the tunnel water was relatively shallow and the pressure of groundwater was small, it was possible to prevent seepage water leakage to some extent by the conventional method. However, the currently designed tunnel is very deep and requires a waterproofing method that can withstand a water pressure of 5 kgf / cm ² or more. The present invention provides a tunnel support rebar structure capable of waterproofing treatment with excellent watertightness by completely stopping water leakage around the screw part of a deformed round bar which is a support rebar for secondary lining concrete reinforcement. The purpose is to do.

[0005]

[Means for Solving the Problems]

 The present invention has been made to solve the above-mentioned problems, and its gist is to provide a concrete anchor having a concave screw hole at the tip of a flanged head through a waterproof sheet on the inner surface of the tunnel. Set it in the primary lining concrete and insert the flanged insert screw in which the tip convex screw part and the rear end concave screw part of the main body are separated and blocked by at least the tip flange plate part, and the convex screw part is concrete Set the superposed sealing packing on the waterproof sheet intervening by being screwed into the recessed screw hole of the anchor, on the concrete anchor so that the flange plate part and the flange press it, and insert the recessed screw part of the insert screw with the flange. It has a tunnel support rebar structure in which a deformed round bar, which is a support rebar for the secondary lining, is screwed in and set. Next, the present invention will be described in detail with reference to the following embodiments with reference to the drawings.

[0006]

【Example】

 In FIGS. 1 and 2, reference numeral 4 is a concrete anchor having a flange 5 and a concave screw hole 6 at the tip of the head. In addition, a tunnel 2 is excavated in an underground ground 1, and a primary lining concrete 3 is immediately sprayed to protect the surface of the tunnel 2 and a high-performance resin waterproof sheet 7 is attached. Therefore, the concrete anchor 4 is set in the primary lining concrete 3 by penetrating the waterproof sheet 7 on the inner surface of the tunnel 2. Next, 9 is a flanged insert screw in which a gap between the tip convex screw portion 12 and the rear end concave screw portion 13 of the main body 10 is separated and cut off by at least the tip flange plate portion 11. Therefore, the flanged insert screw 9 is intervened by screwing the convex screw portion 12 into the concave screw hole 6 of the concrete anchor 4. The waterproof sheet 7 is provided with the superposed sealing packing 8 and the flange plate portion 11 and the flange 5. It is set on the concrete anchor 4 so as to be pressed by. Then, the deformed round bar 14 which is the support rebar of the secondary lining bar 16 is set in the concave screw part 13 of the flanged insert screw 9 by screwing the thread part 15 into the secondary lining bar 16 By appropriately performing the above, a predetermined secondary lining concrete 17 is placed to perform tunnel construction.

[0007]

[Effect of device]

In the present invention, when the sealing packing 8 is attached to the waterproof sheet 7 and the insert screw 9 with the flange is pierced into the concrete anchor 4, the flange 5 of the concrete anchor 4 and the flange plate portion 11 of the insert screw 9 with the flange firmly seal. The packing screw 8 is pressed down, and the insert screw 9 with flange is screwed into the concrete anchor 4 Convex screw part 12 and support of secondary lining bar 16 Recessed screw part into which the deformed round bar 14 which is a reinforcing bar is screwed Since it has a structure in which it is isolated and cut off from the concrete flange 4 by at least the tip flange plate portion 11, the waterproof sheet 7 is guided from the upper part of the concrete anchor 4 through the screw groove on the outer periphery of the convex thread portion 12 of the flanged insert screw 9. Even if the water permeates outside and leaks, the sealing packing 8 is blocked by both flanges. Because they are strongly compressed, stable and robust water-tightness is guaranteed in which water pressure is not able to penetrate water leakage also become a 5Kgf / cm ² or more excessive. In addition, since the leakage water transmission from the upper part around the screw part 15 of the deformed round bar 14 which is the support rebar is blocked and blocked, the secondary lining of the seepage water from the natural ground 1 is prevented from permeating the concrete and completely stopped. It has the effect of providing excellent waterproofing with water.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a tunnel support rebar structure of the present invention.

FIG. 2 is an explanatory view of a disassembled member of the tunnel support rebar structure of the present invention.

FIG. 3 is a vertical cross-sectional explanatory view of a conventional tunnel support rebar structure.

FIG. 4 is a sectional view of a main part of a conventional tunnel support rebar structure.

[Explanation of symbols]

 1,1a Ground 2,2a Tunnel 3,3a Primary lining concrete 4,4a Concrete anchor 5 Flange 6,6a Recessed screw hole 7,7a Waterproof sheet 8,8a Sealing packing 9 Flange insert screw 9a Hexagon nut 10 Main body 11 Flange plate part 12 Convex screw part 13 Recessed screw part 14,14a Deformed round bar 15,15a Screw part 16,16a Secondary lining bar arrangement 17,17a Secondary lining concrete

Claims (1)

[Scope of utility model registration request] A concrete anchor 4 having a recessed screw hole 6 at the head end with a flange 5 is set in the primary lining concrete 3 through the waterproof sheet 7 on the inner surface of the tunnel 2, and the main body 1
The insert screw 9 with a flange in which the space between the tip convex screw portion 12 and the rear end concave screw portion 13 of 0 is separated and cut off by at least the tip flange plate portion 11, the convex screw portion 12 is a concave screw hole of the concrete anchor 4. 6 is set on the concrete anchor 4 so that the waterproof sealing sheet 7 intervened by being screwed to 6 is pressed by the flange plate portion 11 and the flange 5, and the concave screw portion 13 of the flanged insert screw 9 is set. Secondary lining bar arrangement 1
A tunnel support rebar structure that is set by screwing in a deformed round bar that is the support rebar of No. 6.