JPH05239833A - Method of open-shielding construction and concrete caisson body used therefor - Google Patents

Abstract

PURPOSE:To prevent joint displacement from occurring at the time of the execution of a curve, etc., to reduce cost by the partial diversion of a member and to prevent the cleavage and breaking of concrete caisson bodies by rigidly joining mutual concrete caisson bodies simply in a method of open-shielding construction. CONSTITUTION:In a concrete caisson body 4 for a subsurface structure, steel plates 16 for burying, to which tapped holes 18 are formed, are buried into the internal side face of the concrete caisson body 4 so that the ends of the steel plates are arranged in before-behind end faces and surfaces thereof are exposed. In the mutually connected concrete caisson bodies 4, the ends of the steel plates 16 for burying are abutted mutually, steel plates 20 for joining, to which tapped holes 19 are formed, are applied so as to cross the mutual steel plates 16 for burying, and these steel plates 16 for burying and steel plates 20 for joining are fixed and bonded by bolts 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield construction method for constructing an underground structure such as a water supply / sewerage system, a public ditch, a telegraph, a telephone, etc. for laying underground passages, and a concrete box used therefor.

[0002]

2. Description of the Related Art The open shield method is a highly rational method that takes advantage of the open cutting method (open cut method) and the shield method. The outline is shown in FIG. 4. In FIG. 4, 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 force 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 compressed in the tail portion 1c of the shield machine 1. Struts are provided between the propulsion jack 2 and the reaction wall to adjust the spacing as appropriate. In addition, the start pit is composed of a retaining wall, and to start the open shield machine 1, a part of this retaining wall is cut into mirrors. However, if necessary, ground improvement may be applied to the front part of the starting pit by injecting a chemical solution or the like. Sometimes I put it.

An excavator 9 such as a shovel excavates and discharges earth and sand from the front surface or the top 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 line 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 moves forward and remains in the ground. It is something to do. The concrete box 4 is made of reinforced concrete, and includes 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 are open as openings 10.

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

The details are shown in FIG. 6, where 11 is a bolt hole in 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 Reference numeral 14 denotes a groove which opens inside the concrete box 4 and which is connected to the bolt hole 11 and which is provided at an intermediate position that divides the length of the bolt hole 11 into two equal parts and is approximately perpendicular to the bolt hole 11.

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 When connecting 4 to each other,
The bolt 13 is pulled out from the bolt hole 11 in the direction of the arrow, inserted into the bolt hole 11 of the facing concrete box 4, and the tip of the bolt 13 is pulled out to the groove 14 provided in the facing concrete box 4. After that, nuts 15 are respectively screwed into both ends of the bolts 13 from the grooves 14 of the concrete box 4 to tighten them. By performing such work on the four corners of each concrete box 4, the connection work between the concrete boxes 4 is completed.

[0011]

With such a joint alone, each of the four corners of the concrete box 4 is connected by the thin bolts 13, and it is difficult to make a rigid connection. In this case, 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, and the concrete box 4 is also subjected to an uneven load on the left and right sides. ,
It is impossible to stop the concrete boxes 4 from shifting from each other.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to easily and rigidly join the concrete boxes to each other so as to withstand the joint displacement in the curve construction, and to divert a part of the member to the expense. It is an object of the present invention to provide an open shield construction method that can reduce the number of times, and can also prevent the splitting and breaking of a concrete box, and a concrete box used for it.

[0013]

In order to achieve the above-mentioned object, the present invention provides a propulsion jack inside the left and right side wall plates,
A step of excavating and discharging earth and sand in front of the front or upper surface opening of the open shield machine having the front, rear surface and upper surface opened,
The process of extending the propulsion jack and making the concrete box a reaction force to advance the shield machine, and the step of suspending and setting a new concrete box from above behind the propulsion jack contracted in the tail part of the shield machine. In the open shield construction method in which the concrete boxes are sequentially buried in a vertical line by repeating the above steps, the concrete box for underground structures is composed of left and right side plates, an upper floor plate and a lower floor plate, and the front and rear end faces with the opening face in the center are joint faces. The body is made of a steel plate with screw holes and stud dowels protruding on the back side, the ends are aligned with the front and rear end faces, and the surface is exposed. For the box, the ends of the steel plates for embedding are abutted against each other, and the steel plates for joining are provided with screw holes so as to straddle the steel plates for embedding. It is an Abstract that bind bolted and bonded steel plate with a plate.

[0014]

According to the present invention, in the concrete box, the ends of the burying steel plates are abutted against each other, and the joining steel plates provided with the screw holes so as to straddle the burying steel plates are contacted with each other. The steel plate and the joining steel plate are bolted together to be joined together, and the joints between the steel sheets are rigid so that the joints can be prevented from being displaced during curve construction. Further, after the construction, the steel plate for joining can be diverted by removing the bolts, which reduces the construction cost. Furthermore, since the inner surface of the concrete case in which the burying steel plate is buried is protected and covered by this steel plate, the rigidity is increased by this steel plate and the load for pushing out by the propulsion jack is applied to the side of the opening surface. However, it is possible to prevent the occurrence of cracks and the formation of corners.

When the concrete boxes are connected to each other, the burying steel plate and the joining steel plate can be easily joined with bolts, so that the joining work can be performed quickly.

[0016]

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. The concrete box 4 is made of reinforced concrete, and includes 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.

As shown in FIGS. 1 to 3, according to the present invention, an upper floor plate 4c and a lower floor plate 4d of the concrete box 4 are
A burying steel plate (16) having stud dowels (17) protruding at appropriate intervals on the back side was buried so that its ends were aligned with the front and rear end faces and the surface was exposed.

This buried steel plate 16 is provided with screw holes 18 at appropriate intervals.

As described above, the burying steel plates 16 are the upper floor plate 4c and the lower floor plate 4d at the front and rear ends of the concrete box 4.
Can be attached so as to cover from inside, but when the concrete box 4 is manufactured, it can be placed in a concrete form and attached by simultaneous molding during concrete pouring.

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 vertical direction, 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 and the concrete box 4 previously installed in the shield machine 1 are screw holes 19 so as to straddle the steel plates 16 for burying. The joining steel plate 20 provided with is applied, and the embedding steel plate 16 and the joining steel plate 20 are fitted with screw holes 18,
Insert bolt 21 into 19 and fasten with bolt to connect.

As described above, the concrete box 4 acts as a reaction force when the propelling jack 3 is extended for advancing the shield machine 1, but the front and rear end faces of the concrete box 4 and the upper and lower floor plates 4c and the lower floor plate. The inside of 4d is covered with a burying steel plate 16, the rigidity is increased by the steel plate 16 to form a high-strength portion, and the ends of the burying steel plate 16 abut against each other. Even if a considerable load is applied to the front end of the, the corners of the inner part do not hang or cracks occur due to split fracture. This is also the case when performing a curve construction, the stroke of the propulsion jacks 2 arranged on the left and right inside the shield machine 1 is made different, and the shield machine 1 is bent and moved forward. It is possible to prevent the occurrence of cracks and cracks even though the load is uneven.

Further, when the curve construction is completed, such a rigid joint between the burying steel plate 16 and the joining steel plate 20 becomes unnecessary. Therefore, the bolt 21 is removed and the joining steel plate 20 is removed.
Can be diverted to the connection with the burying steel plate 16 elsewhere.

In the above embodiment, the burying steel plate 16 is buried in the upper floor plate 4c and the lower floor plate 4d, but as another embodiment, although not shown, the left side plate 4a and the right side plate 4b are not shown. The burying steel plates 16 may be buried and joined together by the joining steel plate 20.

It is also possible to jointly join the concrete box 4 with the bolts 13 shown in FIG.

[0026]

As described above, the open shield construction method of the present invention and the concrete box used for the same can easily prevent the displacement of joints during curve construction, etc., by rigidly connecting the concrete boxes. In addition, it is possible to reduce the cost by diverting some of the members, and also to prevent the splitting and breaking of the concrete box.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view showing one embodiment of a concrete box of the present invention.

FIG. 2 is a vertical sectional front view showing an embodiment of the concrete box of the present invention.

FIG. 3 is a cross-sectional plan view showing one embodiment of 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 face 13 ... Bolt 14 ... Groove 15 ... Nut 16 ... Buried steel plate 17 ... Stat dowel 18 ... Screw hole 19 ... Screw Hole 20… Steel plate for joining 21… Bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takuya Arimatsu 13-2 Arakicho, Shinjuku-ku, Tokyo Within Juken Concrete Co., Ltd. (72) Inventor Tsukio Someya 1-8-2 Tsukiji, Chuo-ku, Tokyo Asahi Inside Concrete Industry Co., Ltd. (72) Hiroyuki Nitta 19 Tomijindai, Yamagata City, Yamagata Prefecture Toei Concrete Industry Co., Ltd. (72) Inventor Keisuke Kawahara Shingu Town, Kasuya District, Fukuoka Prefecture Kyukon Co., Ltd. 72) Inventor Makoto Note 1092 Yokoshiba, Yokoshiba-cho, Yamatake-gun, Chiba Prefecture Inside the Chiba Ceramic Co., Ltd. (72) Inventor Hisa Ito 1-6-3 Kawada Building, Kanda Ogawamachi, Chiyoda-ku, Tokyo Within Koken Sangyo Co., Ltd.

Claims (2)

[Claims] 1. A step of digging and discharging earth and sand in front of an opening or a front surface of an open shield machine having front, rear and upper surfaces provided with propulsion jacks inside right and left side wall plates, and extending the propulsion jack. Repeat the process of moving the shield machine forward by using the concrete box as a reaction force and the step of suspending and setting a new concrete box from above behind the propulsion jack that has been compressed in the tail part of the shield machine. In the open shield method of sequentially burying concrete boxes in vertical columns, the concrete box for underground structures that consists of left and right side plates, upper floor plate and lower floor plate, and the front and rear end faces with the opening face in the center is the joint surface The burying steel plates with holes are buried in the side surface of the concrete box so that the ends are aligned with the front and rear end faces and the surfaces are exposed, and they are connected to each other. In the concrete box, the ends of the steel plates for embedding are abutted against each other, and a steel plate for joining with a screw hole so as to straddle the steel plates for embedding is applied, and the steel plate for embedding and the steel plate for joining are bolted together. The open shield construction method, which is characterized by joining and joining. 2. A left and right side plate, an upper floor plate and a lower floor plate,
In a concrete box for underground structures, where the front and rear end faces that have the opening face in the center are the joint surfaces, a steel plate with screw holes and a stud dowel protruding on the back side is aligned with the front and rear end faces, and the surface is exposed. The concrete box used for the open shield method is characterized in that it is buried in the side surface of the concrete box as described above.