JPH05239834A - Method of open-shielding construction and concrete caisson body used therefor - Google Patents

Abstract

PURPOSE:To join mutual concrete caisson bodies simply, to prevent the of a joint by joining without displacement and to resist even the execution of a curve in a method of open-shielding construction. CONSTITUTION:In a concrete caisson body 4 for a subsurface structure, a screw bar 16 having a diameter smaller than a circular or a truncated pyramidal root section 17 and the root section 17 are provided protrusively from one end face, a circular or truncated pyramidal opening 26, into which the root section 17 of the screw bar 16 is fitted, is faced to the other end face, and a box-removed body 25 with an opened surface 23 to the internal side face of the concrete caisson body 4 is buried. In the mutually connected concrete caisson bodies 4, one screw bars 16 are inserted into the box-removed bodies 25 while the root sections 17 of the screw bars 16 are fitted into the openings 26 of the other box-removed bodies 25, and washers 27 having diameters larger than the openings 26 are interposed and the root sections 17 are fixed by nuts 28.

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 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 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]

In such a joint method, it is necessary to carry out 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 sides. Since the load is applied, the bolts 13 alone cannot stop the concrete boxes 4 from shifting from each other.

An object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to simply join concrete boxes to each other, and to join them without slipping to prevent opening of the openings and to endure curve construction. It is to provide a shield method 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 move the shield machine forward, 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 has a circular or pyramidal trapezoidal root portion projecting on one end face and a screw rod having a diameter smaller than this root portion, and the other end face has a circular or pyramidal trapezoidal shape to which the root portion of the screw rod fits. A concrete box body that is desired to have an opening and is embedded with a box body having an open surface to the side surface of the concrete box body, and is connected to each other, has one screw rod at the root of the other box body. Pledged to the box vent body while fitted into the mouth, the with intervening washer having a larger diameter than the opening in which the subject matter that it has locking nut.

[0014]

According to the present invention, the concrete boxes are inserted into the box-extracting body while fitting the screw rod projecting from one end face into the box-extracting body while fitting the root portion of the screw rod into the opening of the box-extracting body at the other end face. Since a washer having a diameter larger than that of the opening is interposed in the inside of the box removing body to fasten it with a nut, the wedge-shaped fitting of the root portion of the screw rod and the opening of the box removing body enables even the case of curve construction. There is no risk of opening and the concrete boxes will not come apart.

[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. 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.

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. FIG. 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 at the center, and a base plate 19 to be embedded in the front end face of the concrete box 4 and a cone. Trapezoidal root
A screw hole 22 through which the threaded rod 16 passes
It comprises a base plate having a hole formed 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, the base plate to be the root portion 17 is placed on the base plate 19, and the base plate 19 is inserted so as to penetrate the base plate. The setting is completed by screwing the screw rod 16 up to the base plate 19.

On the other hand, on the rear end face of the concrete box 4,
The box-opening body 25 is embedded. The box-opening body 25 has a frustoconical opening 26 into which the root 17 of the frustoconical shape fits, and is opened on the rear end face of the concrete box 4. It has an open surface 23 to the inner surface. In the illustrated example, the base plate 19 and the box removing 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 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 is different from the concrete box 4 previously installed in the shield machine 1 with one screw rod 16 at its root part.
The 17 is inserted into the box removing body 25 while being fitted into the opening 26 of the other box removing body 25.

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

Further, the root portion 17 of the screw rod 16 and the box removing body 25
Since there is a wedge-like fitting with the opening 26 of the concrete box 4, the concrete boxes 4 will not be dislocated 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 and the rear end surface is provided. A threaded rod 16 may be provided on the. Further, some concrete box bodies 4 may be provided with screw rods 16 on both the front end surface and the rear end surface, and other concrete box bodies may be provided with box-out bodies 25 on both the front end surface and the rear end surface.

Further, the root portion 17 of the screw rod 16 and the body without a box
The opening 26 of 25 may have a rectangular or polygonal truncated pyramid shape, instead of the truncated cone shape.

[0025]

As described above, the open shield construction method of the present invention and the concrete box used for the method can easily join the concrete boxes together, and can join them without shifting to prevent the opening of the eyes, and to perform the curve construction. It is something that can be endured.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of essential parts showing an embodiment of 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 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 ... Screw rod 17 ... Root 19 ... Base plate 20 ... Screw hole 22 ... Screw hole 23 ... Opening surface 24 ... Anchor 25 ... Box removal body 26 ... Opening 27 ... Washer 28 ... Nut

Front page continuation (72) Inventor Tokizo Saita 13-2 Arakicho, Shinjuku-ku, Tokyo Residential building concrete (72) Inventor Takuya Arimatsu 13-2 Araki-cho, Shinjuku-ku, Tokyo Residential building concrete Co., Ltd. (72) Inventor, Seto Someya 1-8-2, Tsukiji, Chuo-ku, Tokyo Asahi Concrete Industry Co., Ltd. (72) Inventor, Hiroyuki Nitta 19 Tomigamidai, Yamagata City, Yamagata Prefecture Toei Concrete Industry Co., Ltd. (72) Inventor Makoto Note 1092 Yokoshiba, Yokoshiba-cho, Yamatake-gun, Chiba Prefecture Chiba Ceramics Co., Ltd. (72) Inventor Hisa Ito 1-6-3 Kanda Ogawamachi, Chiyoda-ku, Tokyo Koshin Sangyo Co.

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 construction method of sequentially burying concrete boxes in vertical columns, the concrete box for underground structures, which consists of left and right side plates, upper floor plate and lower floor plate, and whose front and rear end faces with opening faces in the center are joint faces, A circular or truncated pyramid-shaped root portion and a screw rod having a diameter smaller than this root portion are projectingly provided on the end face of the, and a circular or truncated pyramid base to which the root portion of the screw rod is fitted on the other end face. -Shaped opening is desired, a box body with an open surface to the side of the concrete box is buried, and the concrete box to be connected to each other is one screw rod with its root part at the opening of the other box body. An open shield construction method characterized in that it is inserted into the box-extracting body while being fitted, and a nut is fixed with a washer having a diameter larger than that of the opening interposed. 2. A left and right side plate, an upper floor plate and a lower floor plate,
With the front and rear end faces provided with the opening face in the center as joint faces, in this concrete box for underground structures that joins these joint faces and connects them in tandem, one concrete box is a circular or pyramidal trapezoidal root part from the end face. A screw rod having a diameter smaller than that of this root portion is projected, and the other concrete box body is desired to have a circular or truncated pyramid-shaped opening to which the root portion of the screw rod fits on the end surface, and an open surface to the side surface of the concrete box body. A concrete box for use in an open shield construction method, characterized in that a box-opening body having a box is embedded.