JPH0646079U - Box culvert connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] Rust prevention is possible without injecting grout material into the sheath hole, and workability during connection is improved. A coating member 15 is formed on the outer periphery of the connecting rod 4 by an unbonding material having a rust preventive function, and the connecting rod 4 is located outside the connecting box 2 provided in the connecting box culvert 1 and inside the sheath hole 3. The outer periphery of the portion of the covering member 1
It is covered by 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a box culvert connection structure.

[0002]

[Prior art]

 As shown in FIG. 6, a conventional box culvert connecting structure is a connecting box culvert 1 provided with a connecting box 2 and a sheath hole 3 and connecting a PC steel rod or a round steel which is not rust-proofed. Male screws 4a are engraved on both ends of the rod 4, and an anchor plate 5 having a grout hole 5a is fitted into the end of the connecting rod 4 in the connecting box 2, a washer 6 is inserted, and the male screw 4a is screwed. The end of the connecting rod 4 is fixed in the connecting box 2 by using a fixing nut 7 which fits, and a grout material 8 such as cement paste is injected into the gap between the sheath hole 3 and the connecting rod 4. The connecting rod 4 was rustproofed and fixed.

[0003]

[Problems to be solved by the device]

 However, the conventional box culvert connection structure described above has a problem in that workability during connection is poor because the grout material 8 needs to be injected into the sheath hole 3. In view of the above-mentioned conventional problems, the present invention aims to provide a box culvert connecting structure that does not require injection of grout material into the sheath hole, can prevent rust, and has good workability during connection. And

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention according to claim 1 is characterized in that a connecting rod is passed through a sheath hole of a box culvert, and an end portion of the connecting rod is fixed in a connecting box provided in the box culvert. In the connection structure of the box culverts to be connected, a covering member is formed on the outer periphery of the connecting rod with an unbonded material, and the outer periphery of the portion of the connecting rod in the sheath hole is covered with the covering member. According to a second aspect of the present invention, the box culvert according to the first aspect is characterized in that the outer periphery of the end portion of the connecting rod which is not covered by the covering member is covered with weather-resistant oil and fat. It is in the connection structure of.

[0005]

[Action]

 In the box culvert connecting structure according to the present invention, a covering member is formed on the outer periphery of the connecting rod by an unbonded material, and the outer periphery of the portion of the connecting rod inside the sheath hole outside the connecting box provided on the box culvert is covered. Since it is covered with the covering member and has a rust preventive effect, it is not necessary to inject the grout material into the sheath hole, and the outer circumference of the end of the connecting rod not covered by the covering member is weatherproofed. The rust prevention becomes more reliable by covering with a natural fat and oil.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings by taking as an example a case of being applied to a box culvert having a rectangular cross section. FIG. 1 is a front view showing a box culvert according to an embodiment of the present invention, and FIG. 2 is a perspective view thereof. The connecting box culvert 1 has four sloping slopes 1d which are inclined by approximately 45 degrees with respect to the bottom face 1a, the ceiling face 1b, and both side faces 1c, 1c in a cavity having a quadrangular cross section over the entire length. A connecting box 2 is fixed to a blind hole having a rectangular cross section provided at approximately the center of 1d, and a sheath hole 3 penetrating between the inside of the connecting box 2 and both end faces 1e 1 and 1e in parallel to the axis. Are provided in the four corners. The connecting box 2 is made of cast iron, and is provided at a position inside the end face 1e of the connecting box culvert 1 to prevent damage.

In addition, the connecting box culvert 1 has an annular packing on the end face 1e, for example, a soft packing 10 in which sponge rubber is coated on the surface with vulcanized rubber, and the end faces 1e at the four inner corners thereof are soft. A restriction member 11 made of an elastic material having a hardness higher than that of the packing 10 is arranged and fixed. The restriction member 11 has a connecting rod insertion hole 11a, is thinner than the soft packing 10, and has an end face slightly retracted. When the end face 1e of the box culvert is joined and connected, the compression amount of the soft packing 10 is reduced. Function to limit the

In the case of this embodiment, as shown in FIG. 3, two intermediate culverts 13, 13 are arranged between the connecting box culverts 1, 1. Each of these intermediate culverts 13 is provided with an inclined surface and a sheath hole 3, but differs from the connecting box culvert 1 only in that the connecting box 2 is not provided, and the connecting rod 4 is inserted into the sheath hole 3. To be done.

As shown in FIG. 4, the connecting rod 4 according to the first embodiment of the present invention has an external thread 4a engraved on its end and an unbonded material made of asphalt-based polymer having an anticorrosive effect on the outer periphery. The covering member 15 is formed of a material, the outer periphery of the portion outside the connecting box 2 and inside the sheath hole 3 is covered with the covering member 15, and the end portion is arranged in the connecting box 2. Each connecting rod 4 is fitted with a center hole 5a of an anchor plate 5 on the outer periphery of the end in the connecting box 2, a washer 6 is inserted, and a fixing nut 7 is screwed into the male screw 4a. Has been established. After this fixing, the mortar 17 is filled in the connecting box 2.

Next, a connecting method in the box culvert connecting structure according to the first embodiment will be described. Using the connecting rod 4 in which the covering member 15 is formed in advance with the unbonded material, as shown in FIG. 4, the two intermediate boxes 13 and 13 are arranged between the two connecting box culverts 1 and 1. Deploy. The connecting rod 4 is inserted into each sheath hole 3, the end of the connecting rod 4 is placed in the connecting box 2, the anchor plate 5 is fitted to the end, the washer 6 is inserted, and the male screw 4a is fixed. The nut 7 is screwed to tighten the connecting rod 4, and the end portion is fixed. The mortar 17 is filled in the connecting box 2. By repeating such an operation, a desired number of box culverts are connected.

FIG. 5 is a partial sectional view showing a connection structure of a box culvert according to a second embodiment of the present invention. In the case of the second embodiment, the connecting rod 4 covers the outer periphery of the portion between the end surface of the covering member 15 and the outer surface of the connecting box 2 that is not covered by the covering member 15 with the weather-resistant oil / fat 20, and It differs from the first embodiment in that the covering member 15 is formed of an unbonded material and the weather resistant oil 20 is applied to the outer periphery of the male screw 4a. This is because the position of the end surface of the covering member 15 and the position of the outer surface of the connecting box 2 do not always exactly match each other when a tension force is applied to the connecting rod 4, and the position of the connecting rod 4 is not necessarily the same. This is because the length of the male screw 4a is usually set to a long length with a margin, and the portion of the connecting rod 4 not covered by the covering member 15 may remain in the sheath hole 3. In the case of this embodiment, the other points are the same as those of the first embodiment, and therefore, the same reference numerals are given to the same portions and the duplicated description will be omitted. In the second embodiment, since the outer circumference of the portion of the connecting rod 4 which is not covered with the covering member 15 is covered with the weather-resistant oil / fat 20, rust prevention is ensured.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. For example, the box culvert may have a trapezoidal sectional shape, and three or more intermediate culverts 13 may be arranged side by side between two connecting box culverts.

[0013]

[Effect of device]

 In the present invention according to claim 1, a covering member is formed on the outer periphery of the connecting rod by an unbonded material, and the outer periphery of the portion of the connecting rod outside the connecting box and inside the sheath hole is covered with the covering member. As a result, rust can be prevented without injecting grout material into the sheath hole, and workability at the time of connection is good, and work efficiency can be improved, which is an excellent effect. Further, according to the connection structure of the present invention, it is not necessary to fill the sheath hole with the grout material, and therefore the box culvert can be installed after installation, and if the fixing nut is removed, the culvert can be installed. It is very convenient because it can be replaced.

Further, in the present invention as set forth in claim 2, since the outer periphery of the end portion of the connecting rod which is not covered by the covering member is covered with weather resistant oil and fat, it is not necessary to inject the grout material into the sheath hole. In addition to the above, the portion of the connecting rod that is not covered with the covering member is covered with weather-resistant oil and fat, and excellent rust prevention is possible.

[Brief description of drawings]

FIG. 1 is a front view showing a connection box culvert to be connected in a box culvert connection structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a connection box culvert to be connected in the box culvert connection structure according to the embodiment of the present invention.

FIG. 3 is a side view showing a connected state of the box culvert according to the embodiment of the present invention.

FIG. 4 is a partial cross-sectional view showing a main part of the connection structure of the box culvert according to the first embodiment of the present invention.

FIG. 5 is a partial cross-sectional view showing an essential part of the connection structure of the box culvert according to the second embodiment of the present invention.

FIG. 6 is a partial cross-sectional view showing a conventional box culvert connection structure.

[Explanation of symbols]

 1 Connection Box Culvert 2 Connection Box 3 Sheath Hole 4 Connection Rod 4a Male Thread 5 Anchor Plate 6 Washer 7 Fixing Nut 10 Soft Packing 11 Limiting Member 13 Intermediate Culvert 15 Covering Member 20 Weatherproof Oil

Claims (2)

[Scope of utility model registration request] 1. A connection structure of a box culvert in which a connection rod is passed through a sheath hole of the box culvert, and an end portion of the connection rod is fixed and connected in a connection box provided in the box culvert. A box culvert connection structure in which a covering member is formed on the outer circumference by an unbonded material, and the outer circumference of the portion of the connecting rod in the sheath hole is covered by the covering member. 2. The box culvert connection structure according to claim 1, wherein an outer circumference of an end portion of the connection rod which is not covered with the covering member is covered with weather resistant oil and fat.