JP2014240577A - Segment connection tool and connection method in shield method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment connection tool having the function of a guide pin capable of easily and surely connecting segments even in a narrow sewer whose visual field is limited, and improving working efficiency and a connection method using the segment connection tool.SOLUTION: A segment connection tool for successively connecting segments in an excavating direction according as excavation is performed into the underground in a shield method includes: a bolt 20 of predetermined length configured so as to be protruded from a first segment with its rear end attached to the first segment; a ring 21 configured so as to be inserted through the bolt 20, and to be housed in a bolt insertion hole formed on the opposing surface of a second segment in a state that the bolt 20 is inserted into the bolt insertion hole; and a guide cap 22 configured so as to be freely attachably/detachably mounted on the top end of the bolt 20.

Description

  TECHNICAL FIELD The present invention relates to a segment connector and a connection method used for sequentially connecting segments in a direction of excavation in underground construction using a shield method.

  Conventionally, shield construction methods and propulsion construction methods have been widely used for construction of pipes such as tunnels (Patent Document 1). Among shield methods, recently, small-diameter ones and special propulsion methods using both the shield method and the propulsion method have been developed.

  In the shield construction method, as the shield excavator excavates in the ground, the segments (pieces) divided in advance behind the shield excavator are sequentially assembled into a ring shape, and then connected to the existing ring segment assembly. Build a kite. As a result, it is possible to transport the segment to the rear of the shield machine by passing through the already constructed pipe rod, and it is possible to construct even a particularly narrow pipe rod (for example, an inner diameter of 1000 mm).

Each segment and the existing segment assembly are generally connected by fastening with bolts and nuts. Specifically, the following three types of connection methods are known.
In the first method, the end surfaces of each segment to be fastened are brought into contact with each other, the bolt insertion holes provided on both end surfaces are matched, and then the bolt is inserted from either the existing segment assembly or the segment and fastened with a nut. To do. In this method, in order to put bolts and nuts behind the existing segment assembly and the bolt insertion holes of the segment, a space opened in the existing segment assembly and the inner surface of the segment (hereinafter, this space may be referred to as a bolt box). ) Are provided.

In the second method, an anchor bolt is protruded in advance on one end face of the existing segment assembly and the segment, and the anchor bolt is inserted into a bolt insertion hole provided on the other end face at the time of connection and tightened. It is.
In the third method, a screw hole (insert nut) is provided on one end face of either the existing segment assembly or the segment, and the bolt inserted into the other bolt box is threaded through the bolt insertion hole on the end face. And are fastened with screws.

However, in the first method, since the bolt box is provided at the rear of all the existing segment assemblies and the respective bolt insertion holes, the bolts can be easily inserted and assembled, but the finish inside the tube is smooth. When the property is required, there is a problem that it takes time to fill the concrete in the bolt box after connection, and the work efficiency is deteriorated.
The second method does not require a bolt box because the anchor bolt is used, and can save the trouble of filling the concrete. However, the cost of the anchor bolt itself increases, and once the anchor bolt is fastened, it is easy. Since it cannot be solved, there are problems that it becomes impossible to reassemble due to incorrect segment combinations, etc., and that it cannot be generally used in curved portions.

  On the other hand, in the third method, since only one of the existing segment assembly and the segment is required for the bolt box, the number of bolt boxes is half that of the first method, and the advantage is that it is inexpensive and relatively easy to assemble. There is. However, if the field of view is limited, such as a small-diameter shield construction, where the segment assembly space is very narrow and it is difficult to look directly into the bolt insertion hole, the end surfaces of each heavy segment are brought into contact with each other. It is difficult to accurately perform the assembly work of aligning the bolt insertion holes of the segment end surface with the bolt insertion holes of the existing segment assembly, and therefore it is difficult to join and assemble the segment to the existing segment assembly. There was a problem.

  In order to make the existing segment assembly and each segment bolt insertion hole coincide with each other, a guide pin is protruded from one side and inserted into the other insertion hole separately from the bolt insertion hole.

JP 2013-47444 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a segment connector having a function of a guide pin and a connecting method using the same, which can be easily and surely connected even in a tube with a narrow field of view and work efficiency is improved. Is to provide.

  As a result of intensive studies to solve the above problems, the present inventors have completed the present invention. The segment connector and connection method of the present invention have the following configurations.

(1) A segment connector for building pipes by connecting segments to an existing segment assembly in the rear of the excavator as a result of excavation in the ground using the shield method. Either a segment or an existing segment assembly A bolt having a predetermined length with a rear end attached to one of the bolts, a ring inserted into the bolt and received in a bolt insertion hole formed in the other of the segment and the existing segment assembly, and a tip of the bolt A segment connector, comprising: a guide cap that is detachably attached and a guide cap that is inserted through the bolt insertion hole.
(2) The bolt is screwed into a screw hole provided in the first segment at the rear end or embedded in one of the segment and the existing segment assembly (1). The segment connector described in 1.
(3) A segment connection method in which the pipe is constructed by sequentially connecting the segments to the existing segment assembly at the rear of the excavator along with the underground excavation by the shield method, and the ring is inserted and detachable at the tip. The bolt with the guide cap attached by attaching the rear end of the bolt of a predetermined length with the guide cap attached to either the segment or the existing segment assembly, and abutting the segment with the existing segment assembly The tip of the tube is inserted into a bolt insertion hole formed in the other of the segment and the existing segment assembly, the ring is accommodated in the bolt insertion hole, the guide cap is then removed from the bolt, and the nut is screwed onto the bolt. A segment connection method comprising connecting a segment to an existing segment assembly.
(4) The other end of the segment and the existing segment assembly accommodates the tip of the bolt behind the bolt insertion hole formed in the connection surface with one of the segment and the existing segment assembly, and the nut to the bolt The segment connecting method according to (3), wherein an opening space for screwing is formed.

  According to the present invention, even if the segments are connected to each other in a narrow tube with a narrow field of view, the segments can be easily and surely connected to improve work efficiency. Since it also has a guide pin function, the number of parts can be reduced and the cost can be reduced.

It is explanatory drawing which shows an example of the shield machine to which this invention is applied. (a)-(d) is explanatory drawing which shows an example of the method of assembling and connecting the segment in this invention. (a) And (b) is an exploded perspective view which shows the segment connector which concerns on one Embodiment of this invention, respectively, and a perspective view which shows an assembly state. (a)-(d) is explanatory drawing which shows the connection method of the segment in this invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a pipe construction method for excavating underground by a small-diameter shield method with an inner diameter of about 1000 to 2400 mm.

  In FIG. 1, reference numeral 1 denotes a shield machine. A cutter 2 is attached to the tip of the machine 1 and the cutter 2 is rotated to excavate the ground. A cutter motor 3 for rotating the cutter 2 is provided behind the cutter 2. A shield jack 8 for advancing the excavator 1 with a reaction force that pushes the ring-shaped segment assembly 7 is installed behind the excavator 1. In the shield machine shown in FIG. 1, a pinch valve 4, a mud tank 5, a hydraulic unit 6 and the like are further installed.

  The shield machine 1 is provided with a plurality of middle folding jacks 9.

  The ring-shaped segment assembly 7 is assembled after excavating a certain distance by the shield machine 1, and is connected to the front surface of the existing segment assembly 7 assembled before the excavation. On the outer peripheral side of the segment assembly 7, a tail seal 13 for preventing mud and groundwater from entering the excavator 1 is attached to the shield excavator 1.

FIG. 2 shows how to assemble and connect the segments 7. These assembly and connection operations are performed in the shield machine 1.
As shown in FIGS. 2A to 2D, the segment assembly 7 in the present embodiment includes a plurality of segments 15a to 15d, which are assembled in a ring shape. The first segment 15a to the fourth segment 15d shown in FIGS. 2A to 2D are transported from the wellhead by a segment carriage (not shown).
As the segments 15a to 15d, conventionally used RC-based (cement) segments, steel segments, synthetic segments combining cement and steel, and the like can be used.

  First, as shown to Fig.2 (a), the 1st segment 15a set to the erector (not shown) from the trolley | bogie is turned to a bottom part by an erector. On the other hand, the connector 17 according to the present invention, which also serves as a guide pin, shown in FIG. Then, as will be described later, after aligning the distal end portion of the connection tool 17 and the bolt insertion hole of the first segment 15a, the first segment 15a is pushed in the direction of the arrow, and the first segment 15a is pushed by the connection tool 17. Is connected to the segment assembly 71. In addition, the bolt insertion hole of the 1st segment 15a is formed in the bolt box 16 formed in the inner surface of the 1st segment 15a.

  After attaching the first segment 15a, the second segment 15b is attached as shown in FIG. That is, the knock pin 18 is attached to the side end surface of the first segment 15a, and the knock pin 18 is inserted into the pin receiving long hole 19 provided in the second segment 15b. Next, as shown in FIG. 2 (c), the second segment 15 b is slid in the direction of the arrow, and the second segment 15 b is moved to the segment assembly 71 by the connection tool 17 set on the end face of the existing segment assembly 71. Connecting.

  The through-hole 28 provided in the second segment 15b serves as an inlet for injecting a backfilling injection material that fills the gap between the ground and the segment 7 after the assembly and connection of the segment 7, At the same time, it is also used for attaching a bracket for holding each segment with an erector, and is provided in all the segments.

After the third segment 15c is connected to the segment assembly 71 in the same manner as described above, the upper fourth segment 15d is connected to the segment assembly 71 in the same manner as described above, as shown in FIG. The assembly of the segment assembly 72 and the connection to the segment assembly 71 are completed.
In this embodiment, the segment assembly is assembled with four segments 15a to 15d. However, the number of segments is not limited to four, and may be changed according to the diameter of the pipe rod, for example, It is good that it is about 3-6.

  FIG. 3 shows a segment connector 17 for connecting each segment 15 a to 15 d to the segment assembly 71. The connector 17 includes a dimensioned bolt 20 having a predetermined length, a ring 21 inserted through the bolt 20, and a guide cap 22 that is detachably attached to the tip of the bolt 20.

The details of the method of connecting the segments 15a to 15d to the existing segment assembly 71 using the connector 17 are shown in FIG. For convenience of explanation, in the following explanation, the segments 15 a to 15 d may be simply referred to as the segment 15.
As shown in FIG. 4A, an insert nut 23 is embedded in the end surface of the segment assembly 71 in advance. The rear end portion of the dimensioning bolt 20 is screwed into the screw hole of the insert nut 23 and protrudes from the end surface of the segment assembly 71. A ring 21 is inserted through the bolt 20, and a guide cap 22 is attached to the tip.

  The segment 15 and the segment assembly 71 in this embodiment include a steel frame 26 and concrete 27 filled in the frame 26. One segment 72 has an opening space for inserting the tip of the bolt 20 behind the bolt insertion hole 24 formed on the surface facing the segment assembly 71 and screwing the nut onto the bolt 20. A bolt box 16 is formed.

  From the state shown in FIG. 4A, the segment 72 is slid toward the segment assembly 71 as shown in FIG. 4B, and the bolt box 16 passes through the bolt insertion hole 24 formed in the connection surface of the segment 72. The ring 21 is inserted into the bolt insertion hole 24.

  At this time, since the guide cap 22 is attached to the tip of the bolt 20, the tip of the bolt 20 is protected by the guide cap 22, so that the tip of the bolt 20 is damaged when inserted into the bolt insertion hole 24. Can be prevented. Further, by attaching the guide cap 22 to the tip of the bolt 20, it is possible to serve the same function as a conventional guide pin, and therefore it is not necessary to provide a guide pin or a hole for inserting the guide pin. And the number of parts can be reduced.

From the state shown in FIG. 4B, the guide cap 22 is removed from the bolt 20 (FIG. 4C). Next, as shown in FIG. 4D, a nut 25 is screwed onto the bolt 20 to fasten the segment 15 and the segment assembly 71 together.
In this state, since the ring 21 is accommodated in the bolt insertion hole 24, it is possible to prevent the segment 15 and the segment assembly 71 from being mistaken by the gap in the bolt insertion hole 24. , Accurate and strong connection is possible.

  In FIG. 4, the connection tool 17 is set on the segment assembly 71 and the bolt box 16 is provided on the segments 15a to 15d. However, the connection tool 17 is set on the end faces of the segments 15a to 15d, and the segment assembly 71 is connected. A bolt box 16 may be provided.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the above embodiment, A various change, improvement, and improvement are possible within the range as described in a claim. For example, instead of attaching the rear end of the dimensioning bolt 20 to the insert nut 23 by screwing, the dimensioning bolt 20 may be embedded in segment concrete in advance, instead of being replaced with a post-installed anchor bolt.

DESCRIPTION OF SYMBOLS 1 Shield machine 7 Segment assembly 15a-15b Segment 16 Bolt box 17 Segment connector 20 Bolt (dimension bolt)
21 Ring 22 Guide cap 23 Insert nut 24 Bolt insertion hole 25 Nut 26 Frame

Claims (4)

A segment connector for constructing pipes by sequentially connecting segments to an existing segment assembly at the rear of the excavator with underground excavation by the shield method,
A bolt of a predetermined length with a rear end attached to one of the segment and the existing segment assembly;
A ring inserted into the bolt and accommodated in a bolt insertion hole formed in the other of the segment and the existing segment assembly;
A segment connector, comprising: a guide cap that is detachably attached to a front end portion of the bolt and that passes through the bolt insertion hole.   The rear end portion of the bolt is screwed into a screw hole provided in one of the segment and the existing segment assembly, or is embedded and attached to either the segment or the existing segment assembly. The segment connector according to claim 1. A segment connection method for constructing pipes by sequentially connecting segments to an existing segment assembly at the rear of the excavating machine as the underground excavation by the shield method is performed.
Attach the rear end of a bolt of a predetermined length with a ring inserted and a guide cap removably attached to the tip, to either the segment or the existing segment assembly,
The segment is abutted against the existing segment assembly, the tip of the bolt with the guide cap attached is inserted into the bolt insertion hole formed in the other of the segment and the existing segment assembly, and the ring is accommodated in the bolt insertion hole. ,
Next, a segment connecting method, wherein the guide cap is removed from the bolt, the nut is screwed onto the bolt, and the segment is connected to the existing segment assembly.   The other end of the segment and the existing segment assembly accommodates the tip of the bolt behind the bolt insertion hole formed in the connection surface with one of the segment and the existing segment assembly, and the nut is screwed onto the bolt. The segment connection method according to claim 3, wherein an opening space for wearing is formed.

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