JP6741522B2 - Placement device for receiving steel sheet pile for ground reinforcement - Google Patents

Description

The present invention relates to a driving device for driving a front receiving steel sheet pile for ground reinforcement for ensuring the stability of the top face of a face when excavating a mountain tunnel.

Conventionally, in the excavation construction of a mountain tunnel, in order to ensure the stability of the top of the cutting face, generally, a front-end auxiliary construction method with a length of about 5 m or less is adopted. This preparatory auxiliary construction method is roughly classified into two types, that is, a filling type foreping and an injection type foreping.

The former filling type fore poling is that rock bolts, rebars, pipes, etc. with a length of about 5 m or less are cast from the face of the face to the outer circumference of the upper half arch at a low angle (within 30°) and filled with cement milk, mortar, etc. By doing so, the restraining force against the deformation of the front ground and the top stability are enhanced. The latter injection type fore polling is a rock bolt, pipe, etc. with a length of about 5 m or less from the face face to the diagonal front ground. By placing a cement and pressure-injecting a chemical liquid such as cement milk, urethane, and silica resin, the restraining force against the deformation of the front ground and the top end stability are enhanced.

However, in the case of the filling type fore-polling, there is a risk that the front ground will be loosened by drilling water and the sediment will fall out from between the bolts. There was a problem that the wall could not be self-supporting and the mortar could not be filled properly and the bolts could be inserted incorrectly.

Further, in the injection type forepoling, in particular, in the case of urethane injection in a section with a small overburden such as a wellhead, environmental problems such as uplift of the natural ground and its outflow and accompanying adverse effects on precious plants may occur. At the same time, the outflow of the injection material due to spring water becomes a problem. Further, there is a problem that the construction cost is higher than that of the filling type fore polling.

In response to these receiving assistance methods, in recent years, steel sheet piles of a specified length and a specified width have been struck by tapping and pressure input without drilling water in the tunnel arch part in the earth and sand ground, and the surface is grounded. Is being protected. For example, in Patent Document 1 below, a steel sheet pile driving machine for driving a steel sheet pile at a predetermined position on an upper face of a face in a tunnel, and at least a pair of booms arranged on a traveling carriage so as to be able to descend and turn, and these Guide cells that are connected to the front end of the boom through an actuator and that can be rotated toward the driving position of the steel sheet pile by driving the actuator, and the width of the steel sheet pile placed on each guide cell. A holding mechanism for holding a directional edge, a breaker arranged on the guide cell, and a driving rod that is connected to the breaker and abuts on the rear side in the driving direction of the steel sheet pile and transmits a striking motion to the steel sheet pile. And a moving mechanism for moving the breaker and the driving rod forward in the driving direction of the steel sheet pile.

In addition, in Patent Document 2 below, a steel sheet pile having a required length and width is integrated with a steel pipe having a required length by welding or the like in the length direction, together with a ground reinforcement receiving material, and It is disclosed that the reinforcement receiving material is placed by a jumbo drill (see paragraphs [0025] to [0032]).

JP 8-93379 A JP, 2005-248644, A

However, the steel sheet pile driving machine according to Patent Document 1 is a driving machine developed exclusively for driving steel sheet piles, and is used together with a drill jumbo generally used in mountain tunnels. There is also a problem of wasteful labor and labor due to the installation of the machine, and also the problem of congestion.

Moreover, in the said patent document 2, it is supposed that the driving of the steel sheet pile is by a drill jumbo, but a general rock drill installed in a drill jumbo is based on a rotational force, a striking force, and a propulsion force. Rock bolts and charge holes are formed in the ground, and there are problems such as the need for a drifter structure that does not generate rotational force when driving steel sheet piles.

Therefore, the main object of the present invention is to install a steel sheet pile using a rock drill equipped with a drill jumbo and equipped with a drifter that generates a rotating force, a striking force, and a propulsion force. By making a simple improvement (replacement or attachment/detachment) to the rock machine on site, the steel sheet piles that were held were made to exert only the impact force and the pressure input (propulsion force) without transmitting the rotational force, The purpose is to enable construction with a drill jumbo.

In order to solve the above-mentioned problems, the present invention according to claim 1 is based on a rock mass of a drill jumbo used in a mountain tunnel, which is partially modified to enable a steel sheet pile with a predetermined length and a predetermined width to be driven. A device for placing reinforcement receiving steel sheet piles,
The rock drill, on the guide cell, while providing a rotational force and a striking force to the connected rod, a drifter that applies a pressure input to the rod by moving back and forth along the guide cell is mounted.
An idle-driving rod is connected to the drifter via a shank rod, and the tip of this idle-driving rod can absorb only the striking force and the pressure input by absorbing the rotational force from the drifter, and a steel sheet pile on the tip side. Is provided, and the steel sheet pile held by the special attachment is supported by the first centralizer provided at the tip of the guide cell so as to be movable in the press-fitting direction. Provided is a receiving device for receiving a steel sheet pile for ground reinforcement.

The invention according to claim 1 is directed to a receiving steel sheet pile for ground reinforcement capable of driving a steel sheet pile having a predetermined length and a predetermined width by partially modifying a rock drilling machine of a drill jumbo used in a mountain tunnel. It is a setting device. Specifically, first, the rock drilling machine applies a general-purpose structure, that is, a rotating force and a striking force to a connected rod on a guide cell, and a forward and backward movement along the guide cell. On the condition that a drifter for giving a pressure input to the rod is mounted on the rod, a blanking rod is connected to the drifter via a shank rod, and the tip of the blanking rod is connected to the end of the drifter. A special attachment capable of absorbing the rotational force and transmitting only the striking force and pressure input and holding the steel sheet pile on the tip side, and the steel sheet pile held by the special attachment is the tip of the guide cell. The structure is such that the first centralizer is provided so as to be movable in the press-fitting direction.

As described above, a general drill jumbo rock drill is attached to the special attachment having the above-mentioned function, and it is rotated to the steel sheet pile by replacing it with the first centralizer capable of holding the steel sheet pile. By transmitting only the striking force and the pressing force without transmitting the force, it is possible to drive the steel sheet pile.

As a second aspect of the present invention, there is provided a placing device for a steel receiving sheet pile for ground reinforcement according to claim 1, further comprising a second centralizer that movably supports the blank driving rod in the middle of the guide cell. To be done.

In the invention described in claim 2, a second centralizer for movably supporting the idle driving rod is provided in the middle of the guide cell. By providing the second centralizer, it is possible to prevent the tip of the blank-driving rod from dropping and the special attachment mounting portion from dropping.

As a third aspect of the present invention, in the special attachment, a rod tip fitting portion into which a tip of the blank rod is inserted on the drifter side, and a steel sheet pile holding portion capable of holding a base end portion of the steel sheet pile on the steel sheet pile side. And an outwardly extending arm piece, and the arm piece and the drifter base are connected by a connecting rod. Is provided.

The invention according to claim 3 defines a specific structure of the special attachment. That is, the special attachment has a rod tip fitting portion into which the tip of the blank driving rod is inserted on the drifter side, and a steel sheet pile holding portion capable of holding the base end portion of the steel sheet pile on the steel sheet pile side, and the outer side. It has a structure in which an arm piece extending to the bottom is provided, and the arm piece and the drifter base are connected by a connecting rod. By providing the rod tip fitting portion into which the tip of the blank driving rod is inserted, the rotational force given to the blank driving rod is absorbed here, and only the striking force and the pressure input are transmitted to the steel sheet pile. Become so. The steel sheet pile is held by having a steel sheet pile holding portion capable of holding the base end portion of the steel sheet pile on the steel sheet pile side. Further, by having the arm piece extending outward, and the arm piece and the drifter base being connected by the connecting rod, the rotational force of the blank hitting rod is transmitted through friction, and the special force to rotate. Hold the attachment against rotation.

As a fourth aspect of the present invention, in the connecting portion between the arm piece and the connecting rod, a spring material externally fitted to a tip of the connecting rod is interposed between the arm piece and the special attachment. Is provided so as to be movable in the direction of the drifter by a predetermined amount.

In the invention according to claim 4, in the connecting portion between the arm piece and the connecting rod, a spring material externally fitted to the tip of the connecting rod is interposed between the arm piece and the special attachment. Is movable in the direction of the drifter by a predetermined amount. That is, in the special attachment, even if there is a slight gap between the rod tip into which the tip of the blank-driving rod is inserted and the inner surface of the rod tip fitting portion, when the steel sheet pile is press-fitted, the rod is hit by the drifter. It can be constrained to the drifter side so as to eliminate a gap with respect to the amplitude, and the rod tip into which the tip of the idle driving rod is inserted and the back surface of the rod tip fitting portion are always in close contact with each other. It will be possible to transmit firmly with the pressure input.

According to a fifth aspect of the present invention, the arm piece is an inverted V-shaped bifurcated arm piece, and a pair of left and right arm pieces and a drifter base are connected by a connecting rod. 4. A placing device for a receiving steel sheet pile for ground reinforcement according to any one of 4 above is provided.

In the invention according to claim 5, the arm piece is an inverted V-shaped bifurcated arm piece, and a pair of left and right arm pieces and a drifter base are connected by a connecting rod. Is. By connecting the pair of left and right arm pieces and the drifter base with the connecting rods respectively, the striking force from the drifter acts and the special attachment for supporting the steel sheet pile can be reliably supported.

As the present invention according to claim 6, in the first centralizer, a rock bolt or a drilling rod can be commonly held in addition to the steel sheet pile. A reinforcement receiving steel sheet pile placing device is provided.

In the invention described in claim 6, the first centralizer can commonly hold a lock bolt or a drilling rod in addition to the steel sheet pile. Therefore, the first centralizer can be commonly used when the rock bolt is driven or the charging hole is formed and when the steel sheet pile is driven, and the modification to the rock drill is minimized. Like

As described above in detail, according to the present invention, when a steel sheet pile is driven by using a rock drill equipped with a drill jumbo and equipped with a drifter that generates a rotating force, a striking force, and a propulsive force. , By making simple improvements (replacement and attachment/detachment) to the rock drill on site, it is possible to apply only impact force and pressure input (propulsion force) to the retained steel sheet pile without transmitting rotational force. This made it possible to use a general-purpose drill jumbo.

It is a construction point diagram of the front receiving steel sheet pile 2 for earth reinforcement during tunnel excavation. It is a side view which shows the punching device main body 10 of the drill jumbo 1. It is an expanded side view which shows the rock drill 13. (A) is a side view and (B) is a plan view showing the special attachment 5. FIG. 5 is a view taken along the line V-V in FIG. 4 (a view of the special attachment 5 viewed from the front). (A) is a side view and (B) is a front view showing the first centralizer 6. It is a front view at the time of making the 1st centralizer 6 correspond to a rod for rock bolt drilling, and a rod for charging hole drilling. The second centralizer 7 is shown in (A) a side view and (B) a rear view (a view taken along the line BB). FIG. 3 is a diagram showing a procedure for placing a steel sheet pile 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In the construction of a mountain tunnel, heavy-duty machines for tunnel construction such as a drill jumbo 1, a spraying machine, and a wheel loader are arranged in the face S, and for example, in the example shown in the figure, excavation is carried out by a simultaneous parallel operation of the upper half and the lower half. According to the mini bench construction method, the rock bolt drilling and the charging hole/charging are performed in parallel in each of the upper and lower halves, and then the upper and lower halves are cut off at once, and then slip-out → hitting → primary blowing Excavation work is carried out every cycle by the procedure of installation → steel stake construction → secondary spraying → rock bolt placement, and concrete lining continues on the wall surface after completion of excavation and spraying. Will be constructed.

In the main mountain tunnel, a pre-supporting auxiliary construction method is used to secure the stability of the top of the face, and the restraint force against the deformation of the front ground and the top stability are enhanced. Specifically, tunnel excavation is performed while installing steel sheet piles 2 and 2 (hereinafter also referred to as iron yagi) at a low angle to the tunnel arch portion at appropriate intervals (450 to 600 mm) in the circumferential direction. I am trying. As the steel sheet pile 2, a product name “Tetsuyagi” manufactured by Nippon Steel & Sumitomo Metal Corporation can be preferably used. As the iron arrowwood, a width of 150 mm, a height of 24 mm, and a length of 1.4 to 1.6 m (15 type) is particularly preferably used. Further, as shown in FIG. 1, one end of the iron arrow tree 2 is supported by a steel support bar 3.

As shown in FIG. 1, the drill jumbo 1 is a drilling device having a structure in which a guide cell 12 equipped with a rock drill 13 is supported by a movable carriage 14 via an articulated boom 11.

As shown in FIG. 2, the boring machine main body 10 including the articulated boom 11, the guide cell 12, and the rock drill 13 has a boom base 16 mounted on a base 15 of a carriage 14 by a pivot 17 as shown in FIG. The base end of the telescopic boom 18 is pivotally attached to the boom base 16 by the elevation shaft 19. The telescopic boom 18 includes a base end boom 18A and a front end boom 18B, and the front end boom 18B slides in a telescopic manner with respect to the base end boom 18A. A swiveling hydraulic cylinder 20 is provided between the base 15 and the boom platform 16, and a lifting hydraulic cylinder 21 is provided between the base end boom 18A of the telescopic boom 18 and the boom platform 16 to expand and contract. The boom 18 is capable of turning and descending.

A tilt body 22 is pivotally attached to a tip end portion of the tip boom 18B by a tilt shaft 23, and a tilt hydraulic cylinder 24 is provided between the tip body 18B and the tip boom 18B to be tiltable. A swing body 25 is pivotally attached to the tilt body 22 by a swing shaft 26, and a swing hydraulic cylinder (not shown) is provided between the tilt body 22 and the tilt body 22 to enable swinging. The swing body 25 is provided with a guide rotary 27, which is rotatable about a rotary shaft 28. The guide rotary 27 supports a guide mounting 29 by a mount shaft 30, and the guide mounting 29 supports the guide cell 12 so as to be slidable back and forth. A rock drill 13 is mounted on the guide cell 12. The rock drill 13 has a drifter 31 to which a rod 13b having a bit 13a attached at its tip is inserted and moved forward and backward, and the rock drill 13 is fed in the forward and backward directions to cut the face S Drill into the bedrock.

The drifter 31 is movable along a rail on the guide cell, and applies a rotating force and a striking force to the connected rods by a predetermined hydraulic circuit or a pneumatic circuit, and also the guide cell 12 By moving forward and backward along the path, a pressure input is given to the rod.

The rock drill 13 of the drill jumbo 1 is a heavy machine for tunnel excavation used when forming a charging hole and placing a rock bolt. In the present invention, a part of the rock drill 13 is modified (replacement/replacement). (Detachment) enables the steel sheet pile 2 having a predetermined length and a predetermined width to be placed. Therefore, the partially modified rock drill 13 serves as a driving device for driving the ground receiving steel sheet pile 2 for reinforcement.

In order to make a driving device for the ground receiving steel sheet pile 2 for reinforcement, as shown in FIG. 3, while absorbing the rotational force from the drifter 31 and transmitting only the impact force and the pressure input, A special attachment 5 capable of holding the steel sheet pile 2 is provided at the tip end side, and a first centralizer 6 for holding the steel sheet pile 2 movably in the press-fitting direction is provided at the tip end of the guide cell 12. Then, the blank striking rod 8 is disposed between the drifter and the special attachment 5 via the shank rod 32 of the drifter 31, and the steel sheet pile 2 to be cast is held at the rear end thereof by the special attachment 5. At the same time, the tip of the guide cell 12 is held by the first centralizer 6. Further, as shown in FIG. 3, it is desirable to provide a second centralizer 7 that movably supports the idle driving rod 8 in an intermediate portion of the guide cell 12.

As shown in detail in FIG. 4, the special attachment 5 includes a rod tip fitting portion 33 into which the tip of the blank driving rod 8 is inserted on the drifter 31 side, and a base end of the steel sheet pile 2 on the steel sheet pile 2 side. And a steel sheet pile holding portion 34 capable of holding a portion, and an arm piece 35 extending outward, and the arm piece 35 and the drifter base 37 are connected by a connecting rod 36. There is. More specifically, the rod tip fitting portion 33 is a member made of a tubular member into which the tip of the blank driving rod 8 can be inserted. The rotation force, the striking force, and the pressure input are transmitted from the drifter 31 to the blank driving rod 8, but the blank driving rod 8 is simply fitted into the rod tip fitting portion 33. Here, the rotational force given to the blank hitting rod 8 is absorbed, and only the striking force and the pressure input are transmitted to the steel sheet pile 2.

The steel sheet pile holding portion 34 includes a tubular member 34A and a holding portion 34B into which the base end of the steel sheet pile 2 is fitted. As shown in FIG. 5, the holding portion 34B is a member having a U-shaped cross section with an opening on the front surface, and the base end of the steel sheet pile 2 is fitted and held inside the U-shaped cross section. ing.

An arm piece 35 extending outward is provided at a boundary portion between the rod tip fitting portion 33 and the steel sheet pile holding portion 34. As shown in FIG. 5, this arm piece 35 is an inverted V-shaped bifurcated arm piece 35, and a pair of left and right arm pieces 35A, 35B and a drifter base 37 are connected by connecting rods 36, 36, respectively. It is connected. By connecting the pair of left and right arm pieces 35 and the drifter base 37 with connecting rods 36, 36, respectively, the striking force from the drifter 31 acts and the special attachment 5 supporting the steel sheet pile 2 is surely supported. You will be able to.

At the connecting portion between the arm piece 35 and the connecting rod 36, as shown in FIG. 4, a spring member 38 fitted onto the tip of the connecting rod 36 is interposed between the arm piece 35 and the spring member 38. Thus, the special attachment 5 can be moved in the direction toward the drifter 31 by a small amount, but by a predetermined amount. That is, in the special attachment 5, even if there is a slight gap between the rod tip into which the tip of the blank rod 8 is inserted and the inner surface of the rod tip fitting portion 33, when the steel sheet pile 2 is press-fitted, the drifter is pressed. It can be constrained on the side of the drifter 31 so as to eliminate a gap with respect to the amplitude of the rod due to the impact, and the rod tip into which the tip of the blank rod 8 is inserted and the back surface of the rod tip fitting portion 33 are always in close contact. As a result, the striking force and the pressure input can be transmitted firmly.

Next, as shown in detail in FIG. 6, the first centralizer 6 includes a bolt/nut 41 in which a lower sandwiching member 39 and an upper sandwiching member 40 are provided on both sides and penetrate vertically. As shown in the figure, the steel sheet pile 2 is held in a space between the lower holding member 39 and the upper holding member 40 so as to be movable in the press-fitting direction. A spring member 42 is interposed between the bolt connecting portions of the lower holding member 39 and the upper holding member 40, and the steel sheet pile 2 is held so that it can be smoothly press-fitted by allowing the movement of the sheet pile 2. Has been done.

As shown in FIG. 7, the first centralizer 6 has a space between the lower holding member 39 and the upper holding member 40 in the outer diameter of the lock bolt drilling rod and the charging hole drilling rod. By providing the corresponding ring member 43, the first centralizer 6 can be commonly used.

Further, as shown in detail in FIG. 8, the second centralizer 7 that movably supports the blank striking rod 8 has a vertical holding member 44 and an upper holding member 45 provided on both sides thereof. A ring member 47 is supported between the lower holding member 44 and the upper holding member 45, which is a member joined by bolts and nuts 46, 46 penetrating in the direction. The blanking rod 8 is movably supported by the insertion of the blank 8.

In order to drive the steel sheet pile 2 on the ground by the steel sheet pile 2 placing apparatus described above in detail, as shown in FIG. 9(A), the steel sheet pile 2 having a predetermined length and a predetermined width is attached to the special attachment. 5 and the first centralizer 6, the drifter 31 is applied to the idle driving rod 8 with a rotating force and a striking force by using the drifter 32 without using any drilling water. Move forward along. The rotating force from the drifter 31 is absorbed by the special attachment 5, and only the striking force and the pressure input by the drifter propulsion are transmitted to the steel sheet pile 2. As shown in FIG. Is placed (press fit) in the ground. When the steel sheet pile 2 is driven into a predetermined position, the drifter 31 is retracted together with the blank driving rod 8 as shown in FIG. 9(C). By repeating this procedure along the ground at the top of the cutting face and by repeatedly placing the steel sheet piles 2 at intervals in the circumferential direction, the steel sheet piles 2, 2... it can.

1...Drill jumbo, 2...Steel sheet pile (iron arrowwood), 3...Steel support, 4...Sprayed concrete, 5...Special attachment, 6...First centralizer, 7...Second centralizer, 8...Drying Rod, 13... Rock drill, 31... Drifter, 33... Rod tip fitting part, 34... Steel sheet pile holding part, 35... Arm piece, 36... Connecting rod, 37... Drifter base, 38... Spring material, 39/44 ... Lower clamping member, 40/45... Upper clamping member, 41/46... Bolt/nut, 42... Spring material

Claims (6)

A placing device for a receiving steel sheet pile for ground reinforcement, which enables the placing of steel sheet piles of a predetermined length and a predetermined width by partially modifying a rock drilling machine of a drill jumbo used in a mountain tunnel,
The rock drill, on the guide cell, while providing a rotational force and a striking force to the connected rod, a drifter that applies a pressure input to the rod by moving back and forth along the guide cell is mounted.
An idle-driving rod is connected to the drifter via a shank rod, and the tip of this idle-driving rod can absorb only the striking force and the pressure input by absorbing the rotational force from the drifter, and a steel sheet pile on the tip side. Is provided, and the steel sheet pile held by the special attachment is supported by the first centralizer provided at the tip of the guide cell so as to be movable in the press-fitting direction. Placement device for receiving steel sheet pile for ground reinforcement. 2. The driving device for a steel receiving sheet pile for reinforcing natural ground according to claim 1, further comprising a second centralizer movably supporting the idle driving rod in the middle of the guide cell. The special attachment has a rod tip fitting portion into which the tip of the blank-driving rod is inserted on the drifter side, and a steel sheet pile holding portion capable of holding the base end portion of the steel sheet pile on the steel sheet pile side, and outwardly. 3. An apparatus for driving a steel receiving sheet pile for ground reinforcement according to claim 1, further comprising an extending arm piece, and the arm piece and the drifter base are connected by a connecting rod. At the connecting portion between the arm piece and the connecting rod, a spring material externally fitted to the tip of the connecting rod is interposed between the arm piece and the special attachment, so that the special attachment is moved by a predetermined amount in the drifter side direction. The device for driving a steel sheet pile for receiving ground for reinforcing ground according to claim 3, which is movable. 5. The ground reinforcement according to claim 3, wherein the arm piece is an inverted V-shaped bifurcated arm piece, and a pair of left and right arm pieces and a drifter base are respectively connected by connecting rods. Forecast steel sheet pile placing device. The first centralizer is capable of holding a rock bolt or a drilling rod in common, in addition to the steel sheet pile, for placing a steel receiving sheet pile for ground reinforcement according to any one of claims 1 to 5. apparatus.

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