JP2844157B2 - Open shield method and concrete box used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield method for constructing underground structures such as underground passages such as water and sewage systems, common ditches, telegraphs, telephones and the like in an urban area, and a concrete box used therefor.

[0002]

2. Description of the Related Art The open shield method is a rational method utilizing the advantages of the open cutting method (open cut method) and the shield method. FIG. 7 schematically shows an open shield machine 1 in the figure, which is a front surface comprising left and right side walls 1a and a bottom plate 1b connected to these side walls 1a.
This is a shield machine with open rear and upper surfaces. The open shield machine 1 has the tip of the side wall plate 1a and the bottom plate 1b formed as a blade, and the propulsion jacks 2 are arranged vertically rearward near the center or near the rear end of the side wall plate 1a.

[0003] 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. In addition, the starting pit is constituted by a retaining wall, and in order to start the open shield machine 1, a part of the retaining wall is cut into a mirror, but if necessary, a ground improvement is performed on a front portion of the starting pit by injecting a chemical solution or the like. Sometimes I put it.

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 advance the shield machine 1. In this forward process,
In front of the concrete box 4, a pressing angle 8 made of a frame using a box steel material or a mold steel is provided. Then, the second concrete box 4 is suspended in the tail portion 1c of the shield machine 1 before the first concrete box 4. 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 destination 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 of the shield machine 1, 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. As shown in FIG.
And an upper floor plate 4c and a lower floor plate 4d.

In the meantime, in the open shield method as described above, the concrete box 4 is attached to the tail part 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 for connecting them, a box culvert joint as disclosed in Japanese Utility Model Laid-Open No. 49-45110 can be used.

[0009] Fig. 9 shows the details thereof. In the figure, reference numeral 11 denotes a bolt hole, which is located at each corner of the concrete box 4, perpendicular to the end face 12 of the concrete box 4, and the entire length of the bolt 13. Is provided at a predetermined length capable of storing. Reference numeral 14 denotes a groove that opens into the concrete box 4 and communicates with the bolt hole 11. The groove is provided at an intermediate position that divides the length of the bolt hole 11 into approximately two portions, and is substantially perpendicular to the bolt hole 11.

Until the shield machine 1 is suspended 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 chain lines in FIG. In connecting the four,
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 opposing concrete box 4, and the tip of the bolt 13 is pulled out to the groove 14 provided in the opposing concrete box 4. Thereafter, the nuts 15 are screwed into the two 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, a troublesome operation such as pulling out the bolt 13 must be performed.

An object of the present invention is to solve the disadvantages of the prior art and to provide an open shield method for easily and quickly and firmly joining underground structures such as concrete boxes, and a concrete box used therefor. Is to do.

[0013]

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 top opening, elongating the propulsion jack to advance the shield machine with the reaction force of the underground structure such as a concrete box, etc., and reducing the propulsion in the tail of the shield machine In the open shield construction method in which the new underground structure is suspended from above and set by suspending the new underground structure behind the jack, the underground structure is buried in tandem in sequence, the underground structure has one joint surface, Anchor protruding anchor, also provided with a tapered steel cylinder, buried a steel joining plate with an opening formed in accordance with the position of the mouth, and an anchor receiving hole whose inner diameter gradually increases inward An anchor is projected from the other joint surface, and a wedge insertion hole along the center axis of the rod is formed at the distal end of an opening provided with a screw groove on the inner periphery. An underground structure that embeds a steel joint plate that is screwed around the root of an anchor that is formed as a free piece by providing a radial cut between the rod and the outer peripheral surface of the rod, and connects them to each other. For the object, a wedge having a predetermined length is inserted in advance into a wedge insertion hole at the tip of the anchor of one underground structure, and the wedge is inserted together with the wedge so that the anchor is inserted into the anchor receiving hole of the other underground structure. The open pieces of the rod are expanded by the, and the expanded pieces are fixed in the anchor receiving holes by making surface contact with the inner surface of the anchor receiving holes, so that they are firmly connected to each other. The gist is to make the objects cascade.

Second, a propulsion jack is disposed inside the left and right side wall plates, and a step of excavating and discharging earth and sand in front of the front or top opening of the open shield machine having the front, rear and top surfaces opened; A process of extending the shield machine with the concrete box as a reaction force by extending the concrete box, and a step of suspending and setting a new concrete box behind the propulsion jack shrunk in the tail part of the shield machine. In the open shield method in which concrete boxes are buried in a column in a repeated sequence as appropriate, it consists of left and right side plates, an upper floor plate, and a lower floor plate, and the opening surface is provided at the center. The concrete box for underground structures to be connected to the underground structure has an anchor protruding on one joint surface, and a tapered steel cylinder is provided. A steel joint plate with an opening formed is embedded to form an anchor receiving hole whose inner diameter gradually increases inward, an anchor is protruded on the other joint surface, and a screw is provided on the inner periphery. A wedge insertion hole along the central axis of the rod is formed at the tip of the opening provided with the groove, and a radial cut is provided between the wedge insertion hole and the outer peripheral surface of the rod to form a loose piece. An underground structure that embeds a steel joint plate that is formed by screwing the root of the anchor as above and protruding it, and that connects to each other has a predetermined length in the wedge insertion hole at the anchor tip of one of the underground structures A wedge is inserted in advance, and the wedge is used to insert the anchor into the anchor receiving hole of the other underground structure, and the free piece of the rod is expanded with the wedge. Surface contact with the inner surface of the hole secures the anchor in the hole and firmly connects each other It is an Abstract that is cascade the underground construction with.

Thirdly, the front and rear end faces, which are composed of left and right side plates, an upper floor plate, and a lower floor plate, are provided with an opening surface in the center, and
In this concrete box for underground structures that are connected in tandem with the joint surfaces, an anchor is protruded on one joint surface, and a tapered steel cylinder is provided. Embed a steel joining plate with an opening formed to form an anchor receiving hole whose inside diameter gradually increases toward the inside, and on the other joining surface, project an anchor toward the box, and A wedge insertion hole along the center axis of the rod is drilled at the tip of the opening provided with the screw groove on the inner periphery, and a radial cut is provided between the wedge insertion hole and the rod outer peripheral surface. The gist of the present invention is to embed a steel joining plate in which a root of an anchor which is formed as a loose piece is screwed and projected.

Fourthly, a propulsion jack is disposed inside the left and right side wall plates, and a step of excavating and discharging earth and sand in front of the front or top opening of the open shield machine having the front, rear and top surfaces opened, A process of extending the shield machine with the concrete box as a reaction force by extending the concrete box, and a step of suspending and setting a new concrete box behind the propulsion jack shrunk in the tail part of the shield machine. In the open shield method in which concrete boxes are buried in a column in a repeated sequence as appropriate, it consists of left and right side plates, an upper floor plate, and a lower floor plate, and the opening surface is provided at the center. The concrete box for underground structures, which is connected to the underground structure, has anchors projecting from the front and rear joint surfaces, and a tapered steel cylinder is provided. An anchor receiving hole whose inner diameter gradually increases toward the housing is provided by embedding a steel joint plate with an opening formed, and a wedge insertion hole is formed at the tip of the rod along the center axis of this rod. An anchor in which a radial cut is provided between the wedge insertion hole and the outer peripheral surface of the rod so as to be a loose piece, and a wedge having a predetermined length is previously inserted into the wedge insertion hole. One end of the anchor is inserted into the anchor receiving hole of the joint surface of one of the boxes together with the wedge set in the wedge insertion hole at the tip, and the other end of the anchor is set in the wedge insertion hole at the tip. The loose piece of the rod is inserted into the anchor receiving hole of the other box together with the wedge that was opened, and the free piece of the rod is expanded with the wedge, and the expanded free piece comes into surface contact with the inner surface of the anchor receiving hole, thereby receiving the anchor. Cascading underground structures anchored in holes and tightly connected to each other It is an gist.

[0017]

According to the present invention, with respect to the joint surface of one of the boxes, the root of the anchor is screwed into the screw groove, and a wedge having a predetermined length is previously inserted into the wedge insertion hole at the tip of the anchor. The set can be completed by a simple operation of simply inserting.

The concrete box to be interconnected is made of a steel joint plate such that the tip of the anchor is fitted into the anchor receiving hole of the other box together with the wedge set in the wedge insertion hole at the tip. With the joints facing each other, and in this state, extend the propulsion jack to make the concrete box a reaction force and advance the open shield machine, the joint between the existing concrete box and the suspended concrete box will be Upon receiving the pressing force of the propulsion jack so as to join, the wedge having a predetermined length is pressed at the deepest part of the anchor receiving hole, and the anchor penetrates deeply into the wedge insertion hole of the rod, thereby releasing the rod. The pieces are surely radially expanded from the root, and the expanded pieces are fixed in the anchor holes by making surface contact with the inner surface of the anchor holes, and the concrete boxes are firmly connected to each other. It is coupled.

Further, since the anchor receiving hole is constituted by a tapered steel cylinder provided on a steel joining plate provided with an anchor, it can be provided simply and robustly and has high strength. Even when the concrete box is subjected to an unbalanced load, the connected state of the boxes can be maintained without being damaged.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will 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 left side plate 4a, right side plate 4b, upper floor plate 4c and lower floor plate 4d as shown in FIG. The front and rear surfaces are openings 10.

According to the present invention, as shown in FIGS. 1 and 3, one concrete box 4 is an anchor receiving member whose inner diameter gradually increases toward the inside of the box 4 from one of the front and rear joint surfaces. A hole 17 was provided. The anchor receiving hole 17 may be formed by burying a tapered steel cylinder whose inner diameter gradually increases.

The other joint surface of the concrete box 4 has a wedge insertion hole 19 formed along the center axis of the rod 18 at the tip of the rod 18 and the wedge insertion hole 19 and the rod 18 An anchor 23 in which a radial cut 20 is provided between the outer peripheral surface to form a loose piece 21 and a wedge 22 is set in a wedge insertion hole 19
To protrude.

The position and number of the anchor receiving holes 17 and the anchors 23 are not particularly limited, but are preferably centered on the corners of the concrete box 4, and the steel joint plate 24 with the anchor 24a is connected to the concrete box. The anchor 23 is buried in the joint surface of the body 4, the anchor 23 is protruded by screwing the root to the steel joint plate 24, and the tapered steel cylinder forming the anchor receiving hole 17 has its mouth at this end. Fit into the steel joining plate 24.

Next, the concrete box 4 of the present invention will be described.
I will explain the open shield method using
Although the detailed description is omitted as shown in FIG. 7 as an outline of the entire construction method, the excavation in the open shield machine 1 and the setting process of the concrete box 4 are repeated, and the concrete box 4 is sequentially connected to the open shield machine 1. As it moves forward, it is left in the ground in a column, and a backfill 5 is applied to the upper surface of the concrete box 4.

In this case, the concrete box 4 suspended in the shield machine 1 is different from the concrete box 4 previously installed in the shield machine 1 by an anchor projecting from the joint surface of one concrete box 4. 23 are fitted into the anchor receiving holes 17 on the joint surface of the other concrete box 4 so that these joint surfaces are aligned.

In this state, when the propulsion jack 2 is extended to make the concrete box 4 a reaction force and the open shield machine 1 is advanced, the joint surface between the existing concrete box 4 and the suspended concrete box 4 is formed. The two members receive the pressing force of the propulsion jack 2 so as to overlap each other.

As a result, as shown in FIG.
23 is a rod 18 in which the wedge 22 is pressurized at the deepest portion of the anchor receiving hole 17.
The loose pieces 21 of the rods 18 are radially expanded and fixed in the anchor receiving holes 17 so that the concrete boxes 4 are connected to each other.

FIGS. 4 and 5 show a second embodiment of the present invention. The concrete box 4 has anchor receiving holes 17 on both front and rear joint surfaces.

The anchor 23 is provided with a wedge insertion hole 19 at both ends of the rod 18 along the central axis of the rod 18, and the wedge insertion hole 19 and the outer periphery of the rod 18 are left except for the central part. A radial cut 20 was provided between the two surfaces to form a loose piece 21, and a wedge 22 was set in the wedge insertion hole 19.

The anchor 23 is either a concrete box 4 suspended in the shield machine 1 with the wedge 22 set in the wedge insertion hole 19 or a concrete box 4 previously installed in the shield machine 1. Anchor holes in the joint surface of the box
Insert it slightly into 17.

In this way, one concrete box 4
The anchors 23 projecting from the joint surfaces of the concrete box 4 are fitted into the anchor receiving holes 17 of the joint surface of the other concrete box 4 so as to match these joint surfaces.

In this state, when receiving a pressing force from the propulsion jack 2, the wedge 22 of the anchor 23 is pressed at the deepest part of the anchor receiving hole 17 as shown in FIG.
As a result, the loose pieces 21 of the rod 18 are radially expanded, fixed in the anchor receiving holes 17, and the concrete boxes 4 are connected to each other.

In the above embodiment, the case where the concrete box 4 is used by the open shield method has been described. However, the present invention is not limited to the concrete box 4 but can be used for other underground structures.

[0034]

As described above, the open shield method of the present invention and the concrete box used therein can easily and quickly and firmly join underground structures such as concrete boxes. Since there is no deviation, the openings can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view showing a first embodiment of an open shield method according to the present invention and a concrete box used for the same, prior to connection of main parts.

FIG. 2 is a longitudinal sectional front view showing a first embodiment of the open shield method according to the present invention and a concrete box used in the first embodiment after main parts are combined.

FIG. 3 is a perspective view showing a first embodiment of the open shield method of the present invention and a concrete box used in the first embodiment before the main parts are joined.

FIG. 4 is a longitudinal sectional front view showing a second embodiment of the open shield method according to the present invention and a concrete box used for the same, before main parts are joined.

FIG. 5 is a longitudinal sectional front view showing a second embodiment of the open shield method according to the present invention and a concrete box used for the same, after main parts have been combined.

FIG. 6 is a side view of the anchor.

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

FIG. 8 is a perspective view showing a conventional example of a concrete box.

FIG. 9 is a longitudinal sectional side view showing the joining of a conventional concrete box.

[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 plate 4b ... Right side plate 4c ... Upper floor plate 4d ... Lower floor plate 5 ... Backfill 6 ... Grout material 7 Height adjusting material 8 Pushing angle 9 Excavator 10 Opening 11 Bolt hole 12 End face 13 Bolt 14 Groove 15 Nut 16 Engagement protrusion 17 Anchor receiving hole 18 Rod 19 Wedge insertion hole 20 ... Cut 21 ... Release piece 22 ... Wedge 23 ... Anchor 24 ... Steel joint plate 24a ... Anchor

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) E21D 9/06 331 E03F 3/04

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 underground structure, such as a concrete box, as a reaction force to advance the shield machine, and the new underground structure is suspended from above and set behind the propelled jack shrunk in the tail part of the shield machine In the open shield method of burying underground structures in tandem by repeating the process as appropriate, the underground structure has an anchor protruding on one joint surface, and a tapered steel cylinder is provided, A steel joint plate with an opening formed in accordance with the position of the part is embedded to form an anchor receiving hole whose inner diameter gradually increases inward, and an anchor is projected on the other joint surface, and On the inner circumference In the opening provided with the screw groove, a wedge insertion hole is formed at the distal end along the central axis of the rod, and a radial cut is provided between the wedge insertion hole and the outer peripheral surface of the rod to form a free piece. An underground structure that embeds an anchor that has been screwed at its root and protruded from the root is embedded in the wedge insertion hole at the anchor tip of one underground structure. A wedge is inserted in advance, and the wedge is used to insert the anchor into the anchor receiving hole of the other underground structure, and the wedge is used to expand the free piece of the rod. An open shield method characterized by arranging underground structures in such a manner that they are fixed in the anchor receiving holes by being in surface contact with the inner surface of the receiving holes and are firmly connected to each other. 2. A step of disposing a propulsion jack inside the left and right side wall plates, excavating and discharging earth and sand in front of the front or top opening of the 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 In the open shield method in which concrete boxes are buried one after another in a cascade, it consists of left and right side plates, an upper floor plate, and a lower floor plate, and the opening surface is provided at the center. The concrete box for underground structures to be installed has an anchor protruding from one joint surface and a tapered steel cylinder, which is opened at the position of the mouth. An anchor receiving hole whose inner diameter gradually increases inward is formed by burying a steel joining plate with a mouth formed, and an anchor is projected on the other joining surface, and a screw groove is formed on the inner periphery. A wedge insertion hole along the center axis of the rod is drilled at the tip of the provided opening, and a radial cut is provided between the wedge insertion hole and the rod outer peripheral surface so as to become a free piece. An underground structure that buries a steel joint plate protruding by screwing the root of the anchor into the base and connecting it to each other is connected with a wedge having a predetermined length in the wedge insertion hole at the anchor tip of one underground structure. The wedge is inserted in advance, and the wedge is used to insert the anchor into the anchor receiving hole of the other underground structure, and the free piece of the rod is expanded with the wedge, and the expanded free piece is inserted into the anchor receiving hole. By ground contact with the inner surface, the anchor is fixed in the anchor receiving hole and the ground is connected to each other firmly. Open shield method for causing cascade structures. 3. It comprises a left-right board, an upper floor board and a lower floor board,
An opening surface is provided at the center. The front and rear end surfaces are used as joint surfaces, and this joint surface is connected in tandem with a concrete box for underground structures.One joint surface has an anchor protruding and has a taper A steel cylinder is provided, a steel joining plate with an opening formed in accordance with the position of the mouth is buried to form an anchor receiving hole whose inner diameter gradually increases inward, and the other joining surface A wedge insertion hole along the center axis of the rod is drilled at the distal end of the opening provided with an anchor and a screw groove on the inner periphery, and between the wedge insertion hole and the outer peripheral surface of the rod. A concrete box for use in an open shield method, wherein a steel joint plate is provided in which an anchor having a radial cut is formed so as to become a loose piece, and a root is screwed into the joint plate so as to protrude. 4. A step of disposing a propulsion jack inside the left and right side wall plates, excavating and discharging earth and sand in front of the front or top opening of the 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 In the open shield method in which concrete boxes are buried one after another in a cascade, it consists of left and right side plates, an upper floor plate, and a lower floor plate, and the opening surface is provided at the center. The concrete box for underground structures to be constructed has anchors protruding from the front and rear joint surfaces, and a tapered steel cylinder is provided. An anchor receiving hole whose inner diameter gradually increases toward the housing by burying a steel joining plate with a mouth formed, and a wedge insertion hole along the center axis of this rod is drilled at the tip of the rod At the same time, a radial cut is provided between the wedge insertion hole and the outer peripheral surface of the rod so as to become a free piece, and the wedge having a predetermined length is previously inserted into the wedge insertion hole. One end of the anchor was inserted and set in the anchor receiving hole of the joint surface of the box together with the wedge set in the wedge insertion hole at the tip, and the other end of the anchor was set in the wedge insertion hole at the tip. The free piece of the rod is inserted into the anchor receiving hole of the other box together with the wedge, and the expanded piece is expanded with the wedge. And the underground structures are tandemly arranged so that they are firmly connected to each other. Open shield method that.