JP2512898Y2 - Concrete box for underground structure - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention is for underground structures used in open shield construction methods and other propulsion construction methods for constructing underground structures such as waterways, public ditches, telegraphs, telephones, etc. Regarding concrete boxes.

[0002]

2. Description of the Related Art There are various construction methods for the construction of underground structures, and the open shield construction method is a rational construction method that takes advantage of the open cut construction method (open cut construction method) and the shield construction method.

FIG. 2 shows its outline. In the figure, reference numeral 1 is an open shield machine, which is a shield having front, rear and upper surfaces, which are composed of left and right side wall plates 1a and a bottom plate 1b connected to these side wall plates 1a. It is a machine. 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 side by side in a plurality of rows 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 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 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 such an open shield construction method, as described above, the concrete box 4 is suspended in the tail portion of the shield machine 1 and, as the open shield machine 1 advances, it exits from the tail portion 1c 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 is the tail portion 1 of the shield machine 1.
It is necessary to connect it with the concrete box 4 already installed after it has been 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 thereof are shown in FIG. 4, in which 11 is a bolt hole, which is a haunch portion 12 which is each corner of the concrete box 4, in a direction perpendicular to the end face of the concrete box 4, and The bolt 13 is provided with a predetermined length capable of storing the entire length. Reference numeral 14 denotes a groove which opens inside the concrete box 4 and 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, when hanging down in the tail portion 1c of the shield machine 1, the bolts 13 are stored in the bolt holes 11 of the concrete box 4 as shown by the chain line in FIG. When connecting the concrete boxes 4 to each other, the bolts 13 are pulled out from the bolt holes 11 in the arrow direction, and the bolt holes 11 of the concrete box 4 are opposed to each other.
14 provided in the concrete box 4 which is inserted into
Pull out the tip of the bolt 13 until. After that nut 1
5 from the groove 14 of the concrete box 4 to the bolt 1
Tighten by screwing into both tip ends of 3. By performing such operations for the four corners of each concrete box 4, the connection work between the concrete boxes 4 is completed.

[0012]

In the connection work of the concrete box 4, the existing concrete box 4 and the concrete box 4 to be hung in the tail portion 1c of the shield machine 1 are first connected to each other through the bolt holes 11. The tail part 1 of the narrow shield machine 1
Performing in c is cumbersome and extremely time-consuming.

Further, it is time to pull out the bolts 13 and make a connection. If this is after the propulsion of the shield machine 1, the jacks arranged side by side when the thrust of the propulsion jack 2 is received are unbalanced. However, there is a risk that the suspended frontmost concrete box 4 and the concrete box 4 behind it may be displaced.

In particular, when making a curve construction, 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. Since the load is unevenly distributed, the shift is more likely to occur.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to easily align the concrete boxes with each other, and to cause mutual deviation even if subjected to an eccentric load for pushing out by the propulsion jack. The purpose is to provide a concrete box for underground structures.

[0016]

In order to achieve the above-mentioned object, the present invention is a cylindrical one having front and rear end faces opened as opening faces and having a rectangular cross section composed of left and right side plates, an upper floor plate and a lower floor plate. In the concrete box for underground structure, which has a haunch part at the corner and has a bolt hole for inserting a connecting bolt in the direction perpendicular to the end face of the concrete box, the end faces of the upper and lower floor plates. In addition, for the concrete box body that has insertion holes between the left and right haunch parts and is lined up in front and behind, the guide pins are inserted into the insertion holes about half each to prevent mutual displacement. It is a thing.

[0017]

According to the present invention, the guide boxes inserted into the insertion holes fix and position the concrete boxes which are in front of each other, so that the concrete boxes are provided at four haunches on the upper, lower, left and right sides of the end surface of the concrete box. The bolt holes for inserting the bolts can be easily matched. Further, this guide pin, in addition to the connection by the connecting bolt inserted through the bolt hole, can prevent the concrete boxes from being displaced from each other separately.

Moreover, the positions of the insertion holes are also arranged at equal intervals with respect to the end faces of the concrete box with reference to the position of the haunch portion, so that the joint surfaces of the concrete box can be accurately guided by the guide pins. .

The insertion holes are provided at the end faces of the upper floor plate and the lower floor plate and between the left and right haunch parts, and are located at a position deeper than the left and right ends of the outer periphery of the concrete box. As a result, unlike the case where these are installed side by side in the bolt holes on the corner part of the haunch, when bending the shield machine, bend the shield machine with different strokes of the propulsion jacks arranged on the left and right inside the shield machine. By moving it forward, even if the concrete box receives an uneven load on the left and right, the insertion hole of the guide pin is destroyed, and there is little concern that cracking will occur.

[0020]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of a concrete box for an underground structure of the present invention. The concrete box 4 is made of reinforced concrete as in the conventional example shown in FIG. 4, and the front and rear surfaces of the left side plate 4a, the right side plate 4b, the upper floor plate 4c, and the lower floor plate 4d are openings 10.

Further, a haunch portion 12 which is each corner of the concrete box 4 is provided with a bolt hole 11 of a predetermined length capable of storing the entire length of the bolt 13 in a direction perpendicular to the end surface of the concrete box 4, The groove 14 that conducts to the bolt hole 11 is provided at an intermediate position that divides the length of the bolt hole 11 into approximately two equal parts, respectively, at substantially right angles to the bolt hole 11, and the groove is opened inside the concrete box 4. This is the same as the conventional example.

According to the present invention, the insertion holes 15 are not provided on the front and rear end faces of the concrete box 4 on the haunch portion 12 which is a corner portion, and on the end faces of the upper floor plate 4c and the lower floor plate 4d, and It is provided between the left and right haunch parts 12.
Therefore, the insertion hole 15 is arranged at a position apart from the bolt hole 11. In addition, this insertion hole 1
5 may be a non-through hole having a closed tip. Further, on the front and rear end faces of the concrete box 4, the insertion holes 15 are divided into upper and lower parts and left and right parts, and a total of four are arranged.

On the other hand, 16 is a metal guide pin which is inserted into the insertion hole 15 by half.

Next, the concrete box 4 of the present invention
I will explain the open shield method using
Although an outline of the whole construction method is shown in FIG. 3 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 has the guide pin 16 previously inserted into the insertion hole 15 so that the tip half is projected.

Then, the guide pin 16 is inserted into the insertion hole 1 with respect to the concrete box 4 previously installed in the shield machine 1.
Insert into 5 and match the joint surfaces of the concrete boxes 4.

In this state, even if the propelling jack 2 is extended and the concrete box 4 is used as a reaction force to move the open shield machine 1 forward, the existing concrete box 4 and the concrete box 4 that is hung down will come off. There is no such thing.

As a result, the bolts 13 stored in the bolt holes 11 of the suspended concrete box 4 are pulled out and inserted into the bolt holes 11 of the existing concrete box 4 to connect the concrete boxes 4 to each other. It can be carried out.

In particular, the insertion hole 15 is the concrete box 4
As a result of being positioned deeper than the left and right outer peripheries, the stroke of the propulsion jacks 2 arranged on the left and right inside the shield machine 1 is made different when bending a curve, and the shield machine 1 is bent and moved forward. Even in such a case, even if the concrete box is also subjected to an uneven load on the left and right, the insertion hole 15 is less likely to be broken and chipping or the like is less likely to occur.

[0030]

[Effect of the Invention] As described above, the concrete box for underground structure of the present invention can easily align the concrete boxes with each other, and even if they receive an eccentric load for pushing out by the propulsion jack, There is no risk of misalignment.

[Brief description of drawings]

FIG. 1 is a second concrete box for underground structure of the present invention.
It is a perspective view showing an example.

FIG. 2 is a vertical sectional side view of a main part of a concrete box for an underground structure of the present invention.

FIG. 3 is a vertical sectional side view showing an outline of an open shield method.

FIG. 4 is a perspective view showing a conventional example of a concrete box.

FIG. 5 is a vertical cross-sectional side view showing joining of 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 ... Haunch part 13 ... Bolt 14 ... Groove 15 ... Insert hole 16 ... Guide pin 17 ... Tsuba

 ─────────────────────────────────────────────────── --Continued front page (56) References JP-A-5-132941 (JP, A) JP-A-51-117425 (JP, A) JP-A-49-72935 (JP, A) JP-A-50- 17022 (JP, A) Actually opened 60-14178 (JP, U) Actually opened 62-148688 (JP, U) Actually opened 60-14179 (JP, U) Japanese Patent Publication 2-35096 (JP, B2) Actual Kohei 5-10073 (JP, Y2)

Claims (1)

(57) [Scope of utility model registration request] 1. A tubular product having front and rear end faces opened as opening faces and having a rectangular cross section composed of left and right side plates, an upper floor plate and a lower floor plate, wherein a haunch portion is formed in an inner corner portion, and the haunch portion is formed. In a concrete box for underground structures, which has bolt holes for inserting connecting bolts at right angles to the edge of the concrete box, insert it between the left and right haunch parts at the end faces of the upper and lower floor plates. The reinforced concrete box for underground structures is characterized in that holes are provided and the concrete boxes that are lined up in front and behind are inserted with guide pins about half each in the insertion holes to prevent mutual displacement.