JP4160681B2 - Propulsion steel pipe joint structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe roof construction method used as an auxiliary construction method for tunnel excavation performed directly below a railway, and in particular, a joint structure for a propulsion steel pipe that enables formation of a roof that follows a tunnel having a curved plane alignment. about the elephants.
[0002]
[Prior art]
As a conventional pipe roof construction method, for example, a steel pipe insertion step of forming a roof by inserting straight steel pipes in a row in a portion related to the outer periphery of the tunnel excavation area while excavating and discharging with an auger screw, and using the auger screw There is known a method including a cement milk injection process in which cement milk is injected into an overexcavation region and a steel pipe and a ground are integrated.
[0003]
According to this pipe roof construction method, tunnel excavation can be performed while receiving protection with a straight steel pipe roof integrated with the ground, so that the railway is actually in use above the excavation area, etc. It is effective for tunnel excavation in cases where slack in the natural ground and deformation of the ground surface are not allowed or in cases where the natural ground is collapsible.
[0004]
[Problems to be solved by the invention]
However, in this pipe roof construction method, even when the tunnel to be constructed has a curved plane alignment, a straight steel pipe is used to form the roof. As a result of being placed at a point where the tunnel excavation cross section does not interfere with either the point or the end point, considerable excavation or injection is required. Further, such a roof formation is not preferable from the viewpoint of stable support.
[0005]
An object of the present invention, it is possible to form a roof that follows the tunnel horizontal alignment is curved, therefore, is to provide a joint structure of the propulsion steel pipe which does not require extra excavation and infusion.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a joint structure for a propulsion steel pipe according to the first aspect of the present invention includes a ring-shaped steel receiving port formed at a rear end portion of a casing of an excavator, and the steel receiving port. And a ring-shaped steel push hole formed at the front end portion of the propulsion steel pipe following the casing, and at least one of the steel receiving opening and the steel push hole is in relation to the propulsion steel pipe Folding angle setting for setting the folding angle between the casing and the propulsion steel pipe by receiving at least one of the front end portion of the steel pusher and the rear end portion of the steel receiving port while the propulsive force is applied have a means, between the steel Osaeguchi Prefecture and the steel socket, waterproofing packing to prevent the entry of groundwater into the propulsion steel pipe inside is characterized in that it is interposed.
[0007]
That is, the first invention, the shield casing and the subsequent becomes a steel receptacle and Osaeguchi metallic ring shaped steel ring-shaped formed at an end portion of the coupling of the propulsion steel pipe, those 該推 proceeds during propulsion steel By providing a joint structure for propulsion steel pipes having a bend angle setting means in which the bend angle is set, it is possible to form a roof that follows a tunnel having a curved plane alignment, thus eliminating the need for extra excavation and injection Is possible.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
FIG. 1 is a plan sectional view showing an outline of a curved pipe roof construction method according to an embodiment of the present invention, FIG. 2 is a plan sectional view showing an outline of a joint structure of a propulsion steel pipe used in the curved pipe roof construction method, It is.
[0013]
In these drawings, reference numeral 1 indicates that the face is stabilized by the supply / discharge mud using the supply / discharge mud pipe 1c to the front end region 1b sealed by the partition wall 1a, and the propulsive force A by the main pushing device (not shown). The muddy water pressurizing excavator that performs excavation by rotating the cutter 1d. In the present embodiment, the excavator 1 is composed of an excavator body 11 including a partition wall 1a, a cutter 1d, and the like, and a casing 12 that is structurally equivalent to the propulsion steel pipes 2a, 2b,. . The casing 12 is detachable from the excavator main body 11.
[0014]
Reference numeral 2 denotes a curved steel pipe formed by connecting a plurality of propulsion steel pipes 2a, 2b. In the present embodiment, although not shown, the curved steel pipes 2 are arranged in a row, thereby forming a roof that follows a tunnel having a curved plane alignment. The propulsion steel pipes 2a, 2b,... Themselves are straight steel pipes.
[0015]
Further, reference numeral 3 is a ring-shaped steel receptacle fixed to the rear end portion of the preceding propulsion steel pipe 2a, and reference numeral 4 is a propulsion that is inserted into the steel receptacle 3 and followed. It is a ring-shaped steel push mouth fixed to the front end portion of the steel pipe 2b.
[0016]
Furthermore, reference numeral 5 denotes the preceding propulsion steel pipe 2a and the subsequent propulsion by receiving the front end portion of the steel pusher 4 at the timing when the propulsion force A is applied to the propulsion steel pipe 2b that follows. It is a contact part which is a bending angle setting means for setting a bending angle B with the steel pipe 2b, and constitutes a part of the steel receiving port 3.
[0017]
Moreover, the code | symbol 6 carries out the said propulsion steel pipe 2a and the said succession by receiving the rear-end part of the steel receptacle 3 in the timing when the thrust A is provided with respect to the propulsion steel pipe 2b to follow. It is a contact part which is a bending angle setting means for setting a bending angle B with the propulsion steel pipe 2b, and constitutes a part of the steel pusher 4.
[0018]
Furthermore, the code | symbol 7 is the water stop packing which prevents the penetration | invasion of the groundwater from the joint part to the inside of the curved steel pipe 2. FIG.
[0019]
That is, the joint structure of the propulsion steel pipe in the present embodiment is composed of a ring-shaped steel receiving port 3 and a ring-shaped steel push port 4 fixed to the end portions related to the connection of the preceding and following propulsion steel pipes 2a and 2b. The steel receiving port 3 and the steel pressing port 4 have a contact part 5 and a contact part 6 which are set as the folding angle B of the propulsion steel pipes 2a and 2b at the time of propulsion and serve as folding angle setting means.
[0020]
Next, the curved pipe roof construction method according to the present embodiment will be described with reference to FIGS. FIG. 3 is a plan sectional view showing an outline of the excavator recovery process in the curved pipe roof construction method.
[0021]
In the present embodiment, a plurality of propulsion steel pipes 2a, 2b,... Having the joint structure are connected to a portion related to the outer periphery of the tunnel excavation region having a curved plane alignment using the excavator 1 having the joint structure. The curved steel pipes 2 are arranged in a row, and here, a case where one of the steel pipes is arranged will be described. Direction control is performed by a gyro. Hereinafter, (1) tip propulsion process, (2) second count propulsion process, (3) curve propulsion process, (4) excavator recovery process, and (5) joint welding process will be described.
[0022]
(1) Tip propulsion process First, when the excavator 1 is carried between the mirror part of the start shaft and the main pushing device (not shown), the cutter 1d of the excavator 1 is rotated by the operation of the operator. I'm left.
[0023]
In such a state, when the driving force A is applied to the rear end portion of the excavator 1 via a strut (not shown) by the main pushing device, the excavator 1 is a mirror part of the starting shaft. It is inserted from a wellhead ring (not shown) provided in to a predetermined position in the ground. At this time, mud is sent to the front end region 1b by the operation of the operator to ensure the stability of the face.
[0024]
Subsequently, when the propulsion steel pipe 2a at the tip is carried in between the mirror part of the shaft and the main pushing device, the propulsive force A is applied to the rear end portion of the propulsion steel pipe 2a at the leading end via the strut in the main pushing device. Is granted. Then, the ring-shaped steel push port 4 fixed to the front end portion of the propulsion steel pipe 2a at the tip is inserted into the ring-shaped steel receiving port 3 fixed to the rear end portion of the excavator 1. .
[0025]
Subsequently, when a propulsive force A is further applied to the rear end portion of the propulsion steel pipe 2a at the leading end by the main pushing device, on the other hand, the front end portion of the steel push port 4 has a contact with the steel receiving port 3. On the other hand, the rear end portion of the steel receiving port 3 is received by the abutting portion 6 of the steel pressing port 4, whereby the excavator 1 and the propulsion steel pipe 2 a at the front end are received. A bend angle B is set.
[0026]
And if propulsive force A is further given with respect to the rear-end part of the front-end | tip propulsion steel pipe 2a with the said main pushing apparatus, the said front-end | tip propulsion steel pipe 2a will continue to the predetermined position in the ground following the excavator 1 Inserted. At this time, the bending angle B is continuously maintained in the insertion process of the excavator 1 and the propulsion steel pipe 2a at the tip. Can be inserted along the curve.
[0027]
(2) Second-number propulsion step Next, when the second-number propulsion steel pipe 2b is carried in between the mirror part of the shaft and the main pushing device, the second pushing-up steel pipe 2b is moved to the rear end portion of the second number propulsion steel pipe 2b by the main pushing device On the other hand, a driving force A is given. Then, the ring-shaped steel push port 4 fixed to the front end portion of the second propulsion steel pipe 2b is inserted into the ring-shaped steel receiving port 3 fixed to the rear end portion of the propulsion steel pipe 2a at the tip. Fitted.
[0028]
Subsequently, when a propulsive force A is further applied to the rear end portion of the second-numbered propulsion steel pipe 2b by the main pushing device, on the other hand, the front end portion of the steel push port 4 has the steel receiving port 3. On the other hand, the rear end portion of the steel receiving port 3 is received by the abutting portion 6 of the steel pusher 4, and thereby, the propulsion steel pipe 2 a at the tip and the second number of propulsion are received. A bending angle B with the steel pipe 2b is set.
[0029]
When the driving force A is further applied to the rear end portion of the second propulsion steel pipe 2b by the main pushing device, the second propulsion steel pipe 2b follows the excavator and the propulsion steel pipe 2a at the tip. Is inserted to a predetermined position in the ground. At this time, as a result of the continuation of the bending angle B in the insertion process of the excavator 1, the propulsion steel pipe 2a at the front end, and the second propulsion steel pipe 2b, the main pushing device is substantially the same as when the plane alignment is a straight line. In this operation procedure, the excavation machine 1 and the propulsion steel pipe 2a at the tip can be inserted along a curved line.
[0030]
(3) Curve promotion step Subsequently, (2) a curve promotion step in which the second-number promotion step is repeated as appropriate is performed. The curve propulsion process is repeated until the excavator 1 reaches a desired position.
[0031]
(4) Excavator recovery process And (3) After the curve propulsion process is performed, the excavator recovery process is performed in which the excavator 1 is removed from the propulsion steel pipe 2a at the tip and recovered.
[0032]
First, when the reaching shaft is present, the entire excavator 1 and the front portion of the tip propulsion steel pipe 2a are exposed in the reaching shaft, the entire excavator 1 is removed from the tip propulsion steel pipe 2a, By using an overhead crane (not shown) or the like, it is carried out of the reach shaft. Thereby, the excavator 1 can be collected smoothly and quickly.
[0033]
On the other hand, when there is no reaching shaft, as shown in FIG. 3, the equipment 12 such as the mud pipe 1 c is removed from the excavator 1 and the casing 12 of the excavator 1 is removed from the excavator body 11. Then, the PC steel wire 21 for pulling back is secured to the rear end portion of the machine 11.
[0034]
And on the one hand, the casing 12 is left at the same position, and on the other hand, the propulsion steel pipes 2a, 2b inserted into the ground in the (3) curve propulsion process using the PC steel wire 21. Pull back through. At this time, since the outer diameter of the excavator main body 11 is equal to or smaller than a predetermined size, the bent portion can be smoothly passed. Therefore, even when the reaching shaft is not present, the excavator main body 11 can be collected smoothly and quickly.
[0035]
In the present embodiment, since the casing 12 is structurally equivalent to the propulsion steel pipes 2a, 2b, etc., the performance as a roof for receiving protection in tunnel excavation is sufficiently secured. Yes.
[0036]
(5) Joint welding process (4) After the excavator recovery process, a welding operator enters the inserted curved steel pipe 2, and the joint parts of the propulsion steel pipes 2a, 2b... Are welded from the inside. A curved steel pipe 2 formed by connecting a plurality of propulsion steel pipes 2a, 2b... Is a structurally integrated steel pipe.
[0037]
In this embodiment, this joint welding process is performed from the inside of the curved steel pipe 2 at a timing after the (4) excavator recovery process, but is not limited thereto. Therefore, for example, it may be performed from the outside when the steel push port 4 that follows the steel receiving port 3 that precedes between the mirror portion of the shaft and the main pushing device is inserted.
[0038]
Therefore, according to the curved pipe roof construction method according to the present embodiment, curved steel pipes 2 formed by connecting a plurality of propulsion steel pipes 2a, 2b,... Therefore, it is possible to form a roof that follows a tunnel having a curved plane alignment, thereby eliminating the need for extra excavation and injection.
[0039]
【The invention's effect】
According to the joint structure of the propulsion steel pipe according to the present invention, since the structure described above, it is possible to form a roof that follows the tunnel horizontal alignment is curved. Thus, no extra drilling or injection is required.
[Brief description of the drawings]
FIG. 1 is a plan sectional view showing an outline of a curved pipe roof construction method according to an embodiment of the present invention.
FIG. 2 is a plan sectional view schematically showing a joint structure of a propulsion steel pipe used in a curved pipe roof construction method according to an embodiment of the present invention.
FIG. 3 is a cross-sectional plan view showing an outline of the excavator recovery process in the curved pipe roof construction method according to the embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Excavator 1a ... Bulkhead 1b ... Front end area | region 1c ... Feeding / discharging mud pipe 1d ... Cutter 2 ... Curve steel pipe 2a ... (leading, front-end) propulsion steel pipe 2b ... Steel receiving port 4 ... Steel pusher 5 ... Abutting part 6 ... Abutting part 7 ... Water stop packing 11 ... Excavator main body 12 ... Casing 21 ... PC steel wire A ... Propulsive force B ... Bending angle

Claims (1)

A ring-shaped steel socket formed at the rear end of the casing of the excavator;
It is inserted into the steel receiving port, and consists of a ring-shaped steel pressing port formed at the front end of the propulsion steel pipe following the casing,
At least one of the steel receiving port and the steel pressing port is at least one of a front end portion of the steel pressing port and a rear end portion of the steel receiving port while a propulsive force is applied to the propulsion steel pipe. By receiving one of them, it has a folding angle setting means for setting a folding angle between the casing and the propulsion steel pipe,
A joint structure for a propulsion steel pipe, characterized in that a water stop packing for preventing infiltration of groundwater into the propulsion steel pipe is interposed between the steel receiving opening and the steel push hole.

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