JP2557766B2 - Concrete box joint structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete box joint structure used in an open shield construction method for constructing underground structures such as water supply and sewerage systems, common ditches, telegraphs, telephones and other underground passages.

[0002]

2. Description of the Related Art The open shield construction method is a highly rational construction method that takes advantage of the advantages of the open cut construction method (open cut construction method) and the shield construction method. FIG. 4 shows its outline. In the figure, reference numeral 1 denotes an open shield machine, which has a front surface composed of left and right side wall plates 1a and a bottom plate 1b connected to these side wall plates 1a,
It is a shield machine with openings on the back and top. The open shield machine 1 is formed with the tip ends of the side wall plate 1a and the bottom plate 1b as blade openings, and the propulsion jacks 2 are arranged vertically rearward near the center or the rear end of the side wall plate 1a.

Although not shown, the open shield machine 1 is installed in the starting pit, the propulsion jack 2 of the shield machine 1 is extended, and a reaction force is applied to the reaction wall in the starting pit to advance the shield machine 1. Then, the first concrete box 4 forming the underground structure is suspended from above and set behind the propulsion jack 2 which is contracted in the tail portion 1c of the shield machine 1. Struts are arranged between the propulsion jack 2 and the reaction wall to adjust the distance as appropriate. In addition, the start pit is composed of a retaining wall, and in order to start the open shield machine 1, a part of this retaining wall is cut off with a mirror. However, if necessary, ground improvement is applied to the front part of the starting pit by injecting a chemical solution or the like. Sometimes I leave it.

An excavator 9 such as a shovel excavates and discharges earth and sand from the front surface or the upper surface of the open shield machine 1. Simultaneously with or after this soil discharging step, the propulsion jack 2 is extended to advance the shield machine 1. For this forward step,
In front of the concrete box 4, a pushing angle 8 made of a frame body made of box steel or shaped steel is provided. Then, the second concrete box 4 is suspended in front of the first concrete box 4 in the tail portion 1c of the shield machine 1. Hereinafter, the same soil discharging step, advancing step, and setting step of the concrete box 4 are appropriately repeated to sequentially leave the concrete box 4 in the ground in a row along with the forward movement of the open shield machine 1, and further to this concrete box. Backfilling 5 is applied to the upper surface of 4.

The concrete box 4 is shielded by the shield machine 1
When suspending in the tail portion 1c of, the height adjusting material 7 such as a concrete block is arranged below the concrete box 4, and in the tail portion 1c, in the voids on the left and right sides and the lower portion of the concrete box 4. The grout material 6 is filled.

In this way, when the open shield machine 1 reaches the reaching pit, it is removed and the construction is completed.

In the open shield construction method as described above, the concrete box 4 is suspended in the tail portion of the shield machine 1 as described above, and exits from the tail portion 1c as the open shield machine 1 advances and remains in the ground. It is something that goes. The concrete box 4 is made of reinforced concrete and has a left side plate 4a and a right side plate 4b as shown in FIG.
And an upper floor plate 4c and a lower floor plate 4d, the front and rear surfaces of which are open as openings 10.

By the way, by the open shield construction method as described above, the concrete box 4 has the tail portion 1 of the shield machine 1.
It is necessary to connect to the concrete box 4 already installed when it is hung in c. This concrete box 4
As a method of connecting the two, a box culvert joint as disclosed in Japanese Utility Model Laid-Open No. 49-45110 can be used.

The details are shown in FIG. 6, in which 11 is a bolt hole, which is located at each corner of the concrete box 4 in the direction perpendicular to the end face 12 of the concrete box 4 and the total length of the bolt 13. Is provided in a predetermined length capable of storing 1
4 is an opening inside the concrete box 4, and a bolt hole 11
The bolt holes 11 are provided at substantially right angles to the bolt holes 11 at intermediate positions that divide the length of the bolt holes 11 into two equal parts.

In this way, the bolt 13 is stored in the bolt hole 11 of the concrete box 4 as shown by the chain line in FIG. 6 until it is hung down in the tail portion 1c of the shield machine 1, and the concrete box is In connecting the four to each other, the bolt 13 is pulled out from the bolt hole 11 in the direction of the arrow and inserted into the bolt hole 11 of the facing concrete box 4, and the tip of the bolt 13 up to the groove 14 provided in the facing concrete box 4. Pull out. Then, the nuts 15 are respectively screwed into the both ends of the bolts 13 from the grooves 14 of the concrete box 4 and tightened. By performing such operations for the four corners of each concrete box 4, the connection work between the concrete boxes 4 is completed.

[0011]

In such a joint method, it is necessary to perform a troublesome operation such as pulling out the bolt 13. Moreover, when performing a curve construction, since the strokes of the propulsion jacks 2 arranged on the left and right inside the shield machine 1 are made different and the shield machine 1 is bent and moved forward, the concrete box 4 is also uneven on the left and right. Since the load is received, the concrete box 4 can be made only by the bolts 13.
Can't stop trying to shift each other.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, prevent the bolt from slipping out in the axial direction, easily join the concrete boxes to each other, and join them without shifting to prevent opening of the mesh. In addition, it is to provide a joint structure for a concrete box that can endure a curve construction.

[0013]

In order to achieve the above-mentioned object, the present invention joins concrete boxes which are composed of left and right side plates, an upper floor plate and a lower floor plate, and whose front and rear end faces having an opening face at the center are joint faces. One of the concrete boxes is embedded with a base plate having an anchor on the end face, the base plate is provided with a screw hole into which a screw rod is screwed in the center, and a base plate as a base of a truncated cone shape. A screw hole through which a screw rod penetrates is drilled in the center, and screw rods are screwed into these screw holes to assemble the base plate so that the base of the base plate has a frustoconical root and a screw with a diameter smaller than this root. Conical trapezoid in which the rod is projected, the other concrete box is embedded with a box opener having an open surface to the side of the concrete box, and the base plate is fitted on the end face as a component of this box opener. The front plate with the opening of The concrete box to be brought out and connected to each other is constructed by fitting the base plate protruding from the end surface of one concrete box into the opening of the front plate of the box removing body provided on the end surface of the other concrete box The gist of the present invention is to insert the rod into the box-extracting body and fix the nut with a washer having a diameter larger than that of the opening.

[0014]

Operation According to the present invention, the base plate is embedded in the end face of the concrete box through the anchor, so that the base plate is firmly connected. The base plate has a diameter larger than that of the large diameter portion of the base plate and abuts on the end face around the opening of the box removing body and acts like a washer to prevent the screw rod from coming out. . Further, the base plate is formed into a circular or truncated pyramid shape, and the inclined surface thereof engages with the opening of the box removing body, so that the screw rod is more firmly prevented from slipping out in the axial direction by the wedge-like fitting. Moreover, since a washer having a diameter larger than that of the opening is interposed and fastened with a nut in the box-extracting body, there is no fear of opening even when performing a curve construction, and the concrete boxes are not displaced from each other.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, the concrete box of the present invention will be described. This concrete box 4 is made of reinforced concrete, and comprises a left side plate 4a, a right side plate 4b, an upper floor plate 4c and a lower floor plate 4d as shown in FIG. The front and rear surfaces form the opening 10.

In the present invention, as shown in FIGS. 1 and 3, a frustoconical root portion 17 and a screw rod 16 having a diameter smaller than that of the root portion 17 are provided on the front end surface of the concrete box 4. Figure 2
Shows a member of the projecting portion of the screw rod 16. A screw hole 20 into which the screw rod 16 is screwed is provided in the center, and a base plate 19 to be embedded in the front end face of the concrete box 4 and a truncated cone shape. A screw rod 16 is used to form the root portion 17.
It is composed of a base plate having a screw hole 22 penetrating therethrough in the center and the screw rod 16. Further, the base plate 19 has an anchor 24.

In this way, the base plate 19 is embedded in the front end face of the concrete box 4, and the base plate 19 is
The base plate to be the root portion 17 is placed on the base plate 17, and the screw rod 16 is screwed to the base plate 19 so as to penetrate the base plate, whereby the setting is completed.

On the other hand, on the rear end face of the concrete box 4,
The box-out body 25 is embedded. The box-out body 25 has a thick front plate 25a exposed at the end face of the concrete box 4 and a frustoconical opening 26 into which the frustoconical root 17 is fitted. 4 has an open surface 23 to the inner side surface of the concrete box 4. In addition,
In the illustrated example, the base plate 19 and the box punching body 25 are embedded in the haunches at the four corners of the concrete box 4, but the position is not limited to this.

Next, the concrete box 4 of the present invention
I will explain the open shield method using
Although an outline of the entire construction method is shown in FIG. 4 and detailed description thereof is omitted, the excavation by the open shield machine 1 and the setting process of the concrete box 4 are repeated to sequentially open the concrete box 4 in the open shield machine 1. With the forward movement of the concrete box, it is left in the column in the ground, and backfilling 5 is applied to the upper surface of the concrete box 4.

In this case, the concrete box 4 to be hung inside the shield machine 1 is different from the concrete box 4 previously installed in the shield machine 1 in that one screw rod 16 has its root portion 17 and the other box has been removed. It is inserted into the box removing body 25 while being fitted into the opening 26 of the body 25.

After that, the nut 28 is screwed into the threaded rod 16 by interposing a washer 27 having a diameter larger than that of the opening 26 by utilizing the open surface 23 of the box removing body 25. Tighten with. If you do this,
The screw rod 16 and the nut 28 are combined to fix the whole body, and the concrete boxes 4 are connected to each other.

Further, since there is a wedge-like fitting between the root portion 17 of the screw rod 16 and the opening 26 of the box removing body 25, the concrete boxes 4 are not displaced from each other even when performing a curve construction.

The above-mentioned embodiment is the concrete box 4
The case where the screw rod 16 is provided on the front end surface of the concrete box and the box removing body 25 is provided on the rear end surface has been described, but as another embodiment, conversely, the box removing body 25 is provided on the front end surface of the concrete box 4. A threaded rod 16 may be provided on the. Some concrete boxes 4 have screw rods 16 on both the front and rear end faces.
And the other ones are provided with a box removing body 2 on both the front end face and the rear end face.
5 may be provided.

Further, the root portion 17 of the screw rod 16 and the opening 26 of the box removing body 25 are not a truncated cone shape but a rectangular shape,
It may be a polygonal truncated pyramid.

[0025]

As described above, the joint structure of the concrete box of the present invention prevents the bolts from slipping out in the axial direction, easily joins the concrete boxes, and joins them without shifting. It is possible to prevent the opening of openings and to withstand the construction of curves.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of essential parts showing an embodiment of a joint structure for a concrete box of the present invention.

FIG. 2 is a side view showing constituent members of a screw rod installation portion provided in the concrete box of the present invention.

FIG. 3 is a perspective view showing one embodiment of the joint structure for the concrete box of the present invention.

FIG. 4 is a vertical sectional side view showing an outline of an open shield construction method.

FIG. 5 is a perspective view showing a conventional example of a concrete box.

FIG. 6 is a vertical cross-sectional side view showing joining of conventional concrete boxes.

[Explanation of symbols]

 1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 2 ... Propulsion jack 3 ... Partition wall 4 ... Concrete box 4a ... Left side plate 4b ... Right side plate 4c ... Upper floor plate 4d ... Lower floor plate 5 ... Backfilling 6 ... Grout material 7 ... Height adjusting material 8 ... Push angle 9 ... Excavator 10 ... Opening 11 ... Bolt hole 12 ... End surface 13 ... Bolt 14 ... Groove 15 ... Nut 16 ... Screw rod 17 ... Root 19 ... Base plate 20 ... Screw hole 22 ... Screw hole 23 ... Opening surface 24 ... Anchor 25 ... Box removal body 25a ... Front plate 26 ... Opening 27 ... Washer 28 ... Nut

 ─────────────────────────────────────────────────── ─── Continuation of the front page (73) Patent holder 594074805 Toei Concrete Industry Co., Ltd. 19 Fujijindai, Yamagata City, Yamagata Prefecture (73) Patent holder 000116769 Asahi Concrete Industry Co., Ltd. 1-8-2 Tsukiji, Chuo-ku, Tokyo No. (73) Patent holder 593012402 Sumitomo Concrete Co., Ltd. 4 at 13 Araki-cho, Shinjuku-ku, Tokyo (73) Patent holder 000112196 PS Corporation Marunouchi 3-4-1 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Keisuke Kawahara Shingu-cho, Kasuya-gun, Fukuoka Prefecture Kyukon Co., Ltd. (72) Inventor Makoto Uemura 1-27-14 Fujimoto, Kokubunji, Tokyo Uemura Giken Kogyo Co., Ltd. (72) Inventor Masahiro Nakai 3-4-1 Marunouchi Chiyoda-ku, Tokyo P-S Co., Ltd. (72) Inventor Tokizo Saita 13-2 Araki-cho, Shinjuku-ku, Tokyo Living Concrete Co., Ltd. (72) Inventor Takuya Arimatsu 13-2 Araki-cho, Shinjuku-ku, Tokyo Sumitomo Concrete Co., Ltd. (72) Inventor Someo Tsukio 1-8-2 Tsukiji, Chuo-ku, Tokyo Asahi Concrete Industry Incorporated (72) Inventor Hiroyuki Nitta 19 Tomijindai, Yamagata City, Yamagata Prefecture Toei Concrete Industry Co., Ltd. (72) Inventor Makoto Note 1092 Yokoshiba, Yokoshiba-cho, Sanmu-gun, Chiba In-house Chiba Ceramics (72) Inventor Person Hisa Ito 1-6-3 Kagawa Ogawamachi, Chiyoda-ku, Tokyo Kawashin Building, Koken Sangyo Co., Ltd. (56) References JP-A-52-25430 (JP, A) JP-A-59-1791 (JP, U) 58-163705 (JP, U)

Claims (1)

(57) [Claims] 1. A left and right side plate, an upper floor plate and a lower floor plate,
A concrete box with front and rear end faces that have an opening in the center is used to join the concrete boxes.One of the concrete boxes has a base plate embedded with an anchor on the end face, and the base plate is a screw with which a screw rod is screwed. A hole is provided in the center, and the base plate that constitutes the base of the truncated cone or the truncated pyramid is provided with a screw hole through which a screw rod passes, and the screw rod is screwed into these screw holes. By assembling, a base part of a truncated cone shape or a truncated pyramid shape and a screw rod having a diameter smaller than this base part are projected on the front surface of the base plate, and the other concrete box has an open surface to the side of the concrete box. The body is buried, the front plate with the truncated cone-shaped or the truncated pyramid-shaped opening into which the base plate is fitted is exposed as an end face of this box-extracting body, and the concrete boxes connected to each other are Con The base plate projecting from the end face of the REIT box is fitted into the opening of the front plate of the box removing body provided on the end surface of the other concrete box, and the screw rod is inserted into the box removing body and is larger than the opening. A joint structure for a concrete box characterized in that a nut was fixed with a washer of diameter interposed.