JP3203422B2 - Color for connection of concrete box used for open shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a collar for connecting a concrete box used in an open shield method for constructing underground structures such as water supply and sewerage and an underground passage in an urban area.

[0002]

2. Description of the Related Art The open shield method is a highly rational method utilizing the advantages of the open cutting method (open cut method) and the shield method. FIG. 7 shows an outline of the method.
Is an open shield machine, which is a shield machine having left, right and left side walls 1a and a bottom plate 1b connected to these side walls 1a, with front, rear and upper surfaces opened.

[0003] The open shield machine 1 includes the side wall plate 1a.
And the tip of the bottom plate 1b is formed as a blade, and the side wall plate 1a
The propulsion jacks 2 are arranged vertically rearward near the center or near the rear end of the vehicle. In the figure, reference numeral 3 denotes a partition.

Although not shown, the open shield machine 1 is installed in the start pit, the propulsion jack 2 of the shield machine 1 is extended, and the shield machine 1 is moved forward by applying a reaction force to the reaction wall in the start pit. Then, the first concrete box 4 forming the underground structure is suspended from above and set behind the propulsion jack 2 contracted in the tail portion 1c of the shield machine 1. A strut is provided between the propulsion jack 2 and the reaction force wall to adjust the distance as appropriate.

Further, the starting pit is constituted by a retaining wall, and this retaining wall is partially mirror-cut in order to start the open shield machine 1. However, if necessary, a ground improvement is performed on a front portion of the starting pit by injection of a chemical solution or the like. May be given.

The excavator 9 such as a shovel excavates earth and sand from the front or upper surface of the open shield machine 1 and discharges the earth. Simultaneously with or after this earth removal step, the propulsion jack 2 is extended to move the open shield machine 1 forward. In the case of this advancing process, a pressing angle 8 composed of a frame using a box steel material or a mold steel is disposed in front of the concrete box 4.

[0007] The first concrete box 4
Before the second concrete box 4 is suspended in the tail part 1c of the shield machine 1. Hereinafter, the same earth removal process, advance process, and setting process of the concrete box 4 are appropriately repeated, and the concrete box 4 is sequentially left under the ground as the open shield machine 1 advances, and the concrete box 4 is further removed. A backfill 5 is applied to the upper surface of 4.

The concrete box 4 is connected to the shielding machine 1
When suspended in the tail portion 1c, a height adjusting member 7 made of a concrete block or the like is disposed below the concrete box 4, and in the tail portion 1c, the left and right and lower gaps of the concrete box 4 are provided. 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 method, as described above, the concrete box 4 is suspended in the tail portion 1c of the shield machine 1, and comes out of the tail portion 1c as the open shield machine 1 advances, and goes underground. It is something that remains. 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. .

Although the illustration of the connection between the concrete boxes 4 is omitted, there are cases in which through-holes are provided in the corners in the front-rear direction, and those arranged in tandem with rigid bolts or the like are rigidly connected. As shown in FIG. 9, a ring-shaped joint having a T-shaped cross section called a collar 11 is interposed between the concrete boxes 4, 4 at the front and rear positions, and the front and rear concrete boxes 4 are connected by the collar 11. Sometimes. In the drawing, reference numeral 12 denotes a rubber ring for stopping water interposed between the collar 11 and the concrete box 4.

[0012]

When constructing an underground waterway or the like with an underground structure using such a concrete box 4, a gradient is provided to allow water to flow naturally.
In such a case, a drop occurs in the installation height of the concrete box 4 at the front and rear positions. Therefore, in order to connect the concrete boxes 4 at the front and rear positions, it is not possible to connect using the ring-shaped collar 11 as described above. Conventionally, as shown in FIG. 10, for example, as shown in FIG. 10, a concrete concrete box 4a for connection to be installed at the head is separately manufactured, and the concrete concrete box 4a for this connection is formed.
The front and rear concrete boxes are connected via.

[0013] For this reason, it is necessary to specially prepare a concrete box 4 of a special shape in which the inner surface is formed on an inclined surface so as to match the head, which increases the production cost.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and when constructing an underground structure with an underground waterway, there is no need to prepare a special concrete box to be installed at a place where a head falls. Another object of the present invention is to provide a collar for connecting a concrete box used in an open shield method, in which a concrete box can be easily connected at a head portion to improve workability.

[0015]

In order to achieve the above object, the present invention firstly arranges a propulsion jack inside the left and right side wall plates and opens the front, rear and upper surfaces of an open shield machine. Excavating and discharging earth and sand in front of the upper surface opening, extending the propulsion jack and moving the shield machine forward with a concrete box as a reaction force, and a new process behind the propelled jack shrunk in the tail part of the shield machine The process of suspending a concrete box from above and setting it appropriately is a collar for connecting the concrete box used in the open shield method in which the concrete boxes are buried sequentially in a row, and the concrete in the front position The outer peripheral surface joint to be joined to the outer peripheral surface of the box and the outer peripheral surface joint to be joined to the outer peripheral surface of the concrete box at the rear position are formed in steps with different levels, and both outer peripheral surfaces It is an Abstract that each end face of the top and bottom of the concrete box making of each longitudinal position of the upper portions and the bottom portions of the engagement portion is attached at the end face upper joint part and the end face bottom joint abuts.

Second, an end face side joint part in which the end face of the side part of the concrete box at the front and rear position abuts is connected to the end face upper joint part and the end face bottom joint part. is there.

Third, the upper end joint and the lower end joint of the end face extend inward at the tip and the extension is formed at the joint which abuts on the end face of the concrete box at the front and rear position. Is what you do.

Fourth, the gist of the present invention is to form an inner peripheral surface joint that contacts the inner peripheral surface of the concrete box at the front and rear positions from the upper end joint, the lower end joint, and the extension. .

According to the first aspect of the present invention, when concrete boxes are sequentially connected in a row and buried in a channel or the like having a drop portion, the concrete boxes located before and after the drop portion are stepped. If you attach a connecting collar that is buried and the connection part is formed in a step shape with a step, the outer peripheral surface abutment part is attached to the outer peripheral surface of each concrete box at the front and rear position, and furthermore, the concrete at the front and rear position By connecting either the top or bottom of the end face of the box to the upper end face joint or the end face bottom joint, the concrete box is moved up and down, left and right, and back and forth. Therefore, if the concrete box is further fixed to the collar with bolts or the like, the concrete box at the front and rear positions is connected via the collar.

According to the second aspect of the present invention, in addition to the above operation, the end face side joint part in which the end face of the side of the concrete box at the front and rear position abuts the end face upper joint part and the end face bottom joint part. In this case, not only one of the top and bottom portions of the end surface of the concrete box but also the side portion abuts on the joint portion of the collar, so that the position is more reliably regulated and the connection can be made reliably.

According to the third aspect of the present invention, in addition to the above-described functions, a joint extending from the upper end joint and the lower end joint abuts on the top or bottom of the end face of the concrete box at the front and rear positions. Thus, the upper and lower ends of the end face of the concrete box at the front and rear positions are joined with either the end face upper joint part or the end face bottom joint part and the joint part by this extension part. Therefore, the top surface, the bottom portion, and the side portions of the end face of the concrete box are joined to the collar, and the connection to the collar can be reliably performed.

According to the fourth aspect of the present invention, in addition to the above-mentioned operation, the inner peripheral surface joining portion also contacts the inner peripheral surface of the concrete box, so that the movement in the vertical and horizontal directions is further restricted. Connected securely by collar.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing a first embodiment of a collar for connecting a concrete box used in the open shield method of the present invention, and FIG. 2 is a vertical sectional side view of the same, showing a concrete box using the collar of the present invention. Since the open shield method using this concrete box has already been described, the detailed description is omitted here.

As shown in FIGS. 1 and 2, the collar 13 of the present invention is a square steel frame having a diameter conforming to the outside of the concrete box 4 as shown in FIGS. An outer peripheral surface joining portion that is in contact with the outer peripheral surface is formed, and two outer peripheral surface joining portions 13a and 13b are combined to be attached to the connecting portion of the concrete box 4 at the front and rear positions in a column.

When an underground structure such as a water channel is constructed by the concrete boxes 4 continuously buried in tandem,
For example, as shown in FIGS. 1 and 2, the outer peripheral surface joints 13a and 13b are vertically displaced and combined in parallel so as to be applicable to a step of a drop formed in the water channel, and the concrete box 4 in the front position is formed. An outer peripheral surface joint 13a to be joined to the outer peripheral surface and an outer peripheral surface joint 13b to be joined to the outer peripheral surface of the concrete box 4 at the rear position are formed in a step-like step, and both outer peripheral surface joints are formed.
The upper and lower portions of 13a and 13b are vertically connected to each other with a rectangular steel plate, respectively, and the end surfaces of the upper and lower portions of the concrete box 4 at the front and rear positions abut on each other with the vertical rectangular steel plate. An upper joint 14a and an end bottom joint 14b are formed.

In order to join the concrete boxes 4 and 4 at the front and rear positions where a drop portion (the concrete box 4 at the front position is lower) at the connection point using the collar 13, An outer peripheral surface joint 13b of the collar 13 is fixed in advance to the outer periphery of the front end of the concrete box 4 at the rear position. The fixing means is performed by using bolts and the like as in the prior art. Although not shown, a groove is provided on the outer peripheral surface of the concrete box 4, and a rubber ring for waterproofing is inserted in the groove,
The rubber ring is interposed between the concrete box 4 and the collar 13. In this state, the upper portion of the front end portion of the concrete box 4 is in contact with the end surface upper joint portion 14a.

In this manner, the outer peripheral surface joining portion 13b of the collar 13 is attached to the front end portion of the concrete box 4 at the rear position,
In this state, the outer peripheral surface joint 13a protrudes forward from the front end of the concrete box 4 at the rear position at a position one step lower than the outer peripheral surface joint 13b.

Thus, the shield machine is advanced to set the next concrete box 4 in front of the concrete box 4 already buried, and the rear end of the concrete box 4 at the front position is set at the rear position. 4 is inserted into the outer peripheral surface joint 13a projecting from the front end of the concrete box 4, and the bottom of the rear end of the concrete box 4 at the front position is brought into contact with the end surface bottom joint 14b.

Then, in this state, if the rear portion of the concrete box 4 at the front position is fixed to the outer peripheral surface joint 13a of the collar 13, the concrete boxes 4 at the front and rear positions installed at the drop portion via the collar 13 are connected to each other. Is connected.

FIG. 3 shows a second embodiment. In addition to the structure of the first embodiment, an upper end joint 14a and a lower end joint 14a are provided.
A rectangular end face side joint 14c with which the end face of the side of the concrete box 4 at the front and rear position abuts was coupled to 14b. As a result, in the connected state, the side of the end face of the concrete box 4 at the front and rear positions comes into contact with the end face side joint part 14c, so that not only the top part or the bottom part but also the side part contacts the collar 13. And secure connections.

FIG. 4 shows a third embodiment. In addition to the structures of the first and second embodiments, the tips of the upper end joint 14a and the lower end joint 14b are further extended inwardly into a rectangular shape as they are. The extended portions were formed at the joints 15a and 15b which abut against the end faces of the concrete box at the front and rear positions. This allows
In the connection state, both the top and bottom portions and the side portions of the end face of the concrete box 4 at the front and rear positions are in contact with the collar 13, so that the connection can be further ensured.

FIG. 5 shows a fourth embodiment. In addition to the structure of the first to third embodiments, the upper end face joint portion 14a and the joint portion 15 are formed.
a, the end of the end face side joint 14c, and the joint 15
For example, the inner peripheral surface joining portion 16 in which the inner peripheral surface of the concrete box 4 at the rear position abuts in parallel with the outer peripheral surface joining portion 13b from the leading end of the inner peripheral surface joining portion 13b.
a is provided with a coupling.

Similarly, the end bottom joint 14b and the joint
15b, the end of the end face side joint 14c, and the joint
The inner peripheral surface joint where the inner peripheral surface of the concrete box 4 at the front position is in contact with the outer peripheral surface joint 13a in parallel from the tip of 15a.
Coupling 16b.

Thus, the rear concrete box 4
The outer peripheral surface and the inner peripheral surface are sandwiched between the outer peripheral surface joining portion 13b and the inner peripheral surface joining portions 16a and 16b from both sides, and the concrete box 4 at the front position is also in contact with the outer peripheral surface at the rear end portion. The inner peripheral surface is sandwiched from both sides by the outer peripheral surface joining portion 13a and the inner peripheral surface joining portions 17a and 17b.

The location of the rubber ring 12 interposed between the collar 13 and the concrete box 4 is located at the outer peripheral surface joint.
Although only the joints with 13a and 13b may be provided, they are provided on all joint surfaces with the upper end joint 14a and the lower end joint 14b, the joints 15a and 15b, and the inner peripheral joints 16a, 16b, 17a and 17b. You may.

The step formed by the two outer peripheral surface joining portions 13a and 13b is not limited to the vertical direction as shown in the above-described first to fourth embodiments. It is also possible.

FIG. 6 shows a fifth embodiment. In some cases, the diameter of the water channel varies between the upstream side and the downstream side. In such a case, the large diameter concrete box 4 and the small diameter concrete box 4 are used. Will be connected. In such a case, a collar 18 is used that is a combination of an outer peripheral surface joint 18a that matches the outer diameter of the large diameter concrete box 4 and an outer peripheral joint 18b that matches the outer diameter of the small diameter concrete box 4. I do.

The outer peripheral surface joining portions 18a and 18b are provided with an end surface joining portion 19 which comes into contact with the joining end surface of the large diameter concrete box 4 and the small diameter concrete box 4 from the ends of both outer peripheral surface joining portions 18a and 18b. The outer peripheral surface joining portions 18a and 18b are connected in a stepwise manner at the end surface joining portion 19.

In order to connect the large-diameter concrete box 4 and the small-diameter concrete box 4 with the collar 18, the outer peripheral surface joint 18a is fixed to the front end of the large-diameter concrete box 4. The rear end of the small-diameter concrete box 4 is inserted into the outer peripheral surface joint 18b.
What is necessary is just to make the rear end face contact the end face joint portion 19 and fix it.

[0040]

As described above, the collar for connection of the concrete box used in the open shield method of the present invention has a head drop when constructing an underground waterway or the like with an underground structure formed by a series of concrete boxes. There is no need to prepare a special concrete box for installation at a certain location, and the connection of the concrete box at the head can be easily performed, so that the workability is improved and the construction cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a collar for connecting a concrete box used in the open shield method of the present invention.

FIG. 2 is a longitudinal sectional side view showing a first embodiment of a collar for connecting a concrete box used in the open shield method of the present invention.

FIG. 3 is a perspective view showing a second embodiment of a collar for connecting a concrete box used in the open shield method of the present invention.

FIG. 4 is a longitudinal sectional side view showing a third embodiment of a collar for connecting a concrete box used in the open shield method of the present invention.

FIG. 5 is a longitudinal sectional side view showing a fourth embodiment of a collar for connecting a concrete box used in the open shield method of the present invention.

FIG. 6 is a longitudinal sectional side view showing a fifth embodiment of a collar for connecting a concrete box used in the open shield method of the present invention.

FIG. 7 is a vertical sectional side view showing an outline of the open shield method.

FIG. 8 is a perspective view of a concrete box.

FIG. 9 is a longitudinal sectional side view showing a connecting portion of a concrete box using a conventional collar.

FIG. 10 is a longitudinal sectional side view showing a connection part of a concrete box at a conventional head part.

[Explanation of symbols]

DESCRIPTION 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 wall plate 4b ... Right side wall plate 4c ... Upper floor plate 4d ... Lower floor plate 5 ... Backfill 6 ... Grouting material 7 ... Height adjusting material 8 ... Push angle 9 ... Excavator 10 ... Opening 11 ... Collar 12 ... Rubber ring 13 ... Collar 13a, 13b ... Outer peripheral joint 14a ... End face upper joint 14b ... End face bottom joint 14c ... end face side joint 15a, 15b ... joint 16a, 16b ... inner peripheral surface joint 18 ... collar 18a, 18b ... outer peripheral surface joint 19 ... end surface joint

Claims (4)

(57) [Claims] 1. A step of disposing a propulsion jack inside a left and right side wall plate, excavating and discharging earth and sand in front of a front or top opening of an open shield machine having front, rear and top openings, and extending the propulsion jack. The concrete box as a reaction force to move the shield machine forward, and the step of hanging a new concrete box from above and setting it behind the propelled jack shrunk in the tail part of the shield machine as appropriate For connecting the concrete box used for the open shield method in which concrete boxes are buried one after another in tandem. The outer peripheral surface joints to the outer peripheral surface of the concrete box at the front position and the concrete box at the rear position. The outer peripheral joint to be joined to the outer peripheral surface of the body is formed in a stepped shape with a step, and the top and bottom of both outer peripheral joints are in concrete A collar for connecting a concrete box used in an open shield method, wherein the upper and lower ends of the metal box are joined at an upper end joint and an end bottom joint where the respective end faces abut. 2. The open shield method according to claim 1, wherein the upper end joint and the lower end joint of the end face are joined to an end face side joint where the side end faces of the concrete box at the front and rear positions abut. Color for connecting the concrete box to be used. 3. The end face top joint and the end face bottom joint,
The concrete box used in the open shield method according to claim 1 or 2, wherein the tip is extended inward and the extended portion is formed at a joint portion abutting on the end face of the concrete box at the front and rear positions. Color. 4. The open shield method according to claim 3, wherein an inner peripheral surface joining portion which is in contact with an inner peripheral surface of the concrete box at the front and rear positions is coupled from the upper end joint portion, the lower end joint portion and the extension portion. Color for connecting concrete box.