JPS605906A - Installation work of penstock by jack-up process - Google Patents

Abstract

PURPOSE:To install steel pipes by lessening frictional resistance in pushing up them by a method in which a jack-up device is set in an operation room provided on the lower end of a skew shaft, and tapered single pipes whose upper end diameter is larger than its lower end are orderly connected and pushed up. CONSTITUTION:An operating room 10 with a jack-up device 21 is set on the lower end of a skew shaft 1, and tapered pipes 14 whose upper end diameter is larger than its lower end are carried in a lower drift 11. The tapered pipes 14 are pushed up by the jack-up device 21, and a single pipe 41 is contacted with the lower part of the pipes 14 and connected by welding. While pushing up them orderly, the following single pipes are connected to the preceding single pipe 41. Concrete is placed into the space between the tapered pipes 14 and the inner wall of the skew shaft 1, and cement mortar is packed into the space 16 formed by the large-diameter portion of the tapered pipe 14 after installing the steel pipes from a nozzle 39. The presence of the space 16 makes frictional resistance smaller in pushing up the pipes.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for installing a penstock by jacking up.

Conventionally, as shown in Figure 1, the method of installing a relatively small-diameter penstock pipe into a long inclined shaft is to excavate a inclined shaft (1) with a considerably larger inner diameter than the iron pipe to be installed, and then insert the rail (
2), the single pipe (43) to be installed is carried in from the entrance (3) provided in the horizontal part of the tunnel that connects to the upper part of the inclined shaft (1), and placed on the delivery cart (5), and then The loading truck (5) is moved by the loading winch (i6) installed on the horizontal section.
The single pipe (43) was carried to the installation position, the carrying cart (5) was pulled up, and it was joined to the already installed pipe (42) by hand welding. As I was repeating this kind of work, I decided to use a single tube (44
, 42, 43...) will change as the installation progresses. In addition, the iron pipe to be installed (
4) and the inner surface of the inclined shaft (1), the pipes cannot be joined inside the inclined shaft (1).
The disadvantage of 1) is that the inner diameter is large, which increases excavation costs. Furthermore, if the inner diameter of the hemming iron pipe (4) is smaller than a certain level, it may be difficult to work inside the pipe, or the inclined shaft (
If 1) is a concern, it may be inconvenient for workers to get to the work location, or the work location may change as the work progresses.
It had many shortcomings, such as not being able to secure a constant foothold at all times and problems with workability, and improvements were desired.

Therefore, the present invention provides a method for installing hydraulic iron pipes by jacking up that eliminates such drawbacks, and its characteristics are that a working chamber is formed at the lower end of the inclined shaft, and jacking up equipment is arranged in the working chamber. A tapered pipe whose upper head is larger in diameter than the lower end is carried into the work chamber from the lower tunnel.
The tapered pipe is pushed up by jack-up equipment, the first single pipe is carried into the work chamber from the lower tunnel, and its upper end is joined to the lower end of the tapered pipe, and then the first single pipe is pushed up by the jack-up equipment, and the tapered pipe is is inserted into the inclined shaft, concrete is poured between the tapered pipe and the inner surface of the inclined shaft, and then the second single pipe is carried into the working chamber and its upper end is joined to the lower end of the first single pipe. In the second stage, the jack-up equipment
The single pipes were pushed up, concrete was poured between the tapered pipe and the inner surface of the inclined shaft, and in the same way, each of the third and subsequent single pipes was carried into the work room one after another, and the single pipes were joined together and pushed up using jack-up equipment. The purpose of this method is to install a penstock in the inclined shaft and fill the space between the penstock and the existing concrete with mortar.

According to this construction method, the following effects can be obtained.

(G) Concrete can be placed in the inclined shaft in parallel with the work of joining the single pipe to the lower end of the tapered pipe or single pipe that has already been pushed up, improving work efficiency.

(1') Since tapered pipes and single pipes can always be joined in the same work room, even if an automatic welding machine is installed in the work room, it is extremely easy to handle, and welding quality can be expected to improve.

(1) Sufficient work space can be secured in the work room, and the footing is stable, preventing workers from falling, improving safety.

(b) Since it is sufficient to make the inner diameter of the inclined shaft slightly larger than the outer diameter of the tapered pipe or single pipe to be installed, the cost of excavating the inclined shaft can be reduced.

(3) It is easy for workers to get to the work room.

(Power) It is easy to bring equipment and materials into the work room.

(Sou) Ventilation of the work room is also easy because the location is fixed. Therefore, it is also favorable from the standpoint of environmental hygiene.

That is, when the construction method of the present invention is implemented, it has the effect of improving work efficiency, welding quality, safety, work environment, and economic efficiency compared to conventional construction methods.

An embodiment of the present invention will be described below with reference to FIG. 2 and the following figures. αO is the working chamber formed at the lower end of the inclined shaft (1), α
υ is a lower tunnel that communicates with the working room, and a rail α for the loading cart (6) is laid on the bottom surface. Q41
is a tapered pipe whose upper end head is larger in diameter than the lower end, and σ9 is an inclined shaft (1
) are arranged at appropriate intervals in the support rods (the tapered pipe α4 and the single pipe (4, ,
42, 43...) guide rollers. 07) is a protective wall installed in the upper part of the working chamber (IQ), which has a tapered pipe 04 in the center and a passage hole α mark for the single pipe (4, 4, 45...). . q is a column installed in the four corners of the work chamber (1), and both ends are fixed to the protective wall αη and the inclined end face (IOA) of the work chamber oo, and the two columns are parallel to each other. It consists of a rod rod (19A) and a connecting plate (19B) that connects the rod rods (19A).

Further, pin holes are formed in the rod rod (19A) of each rod at regular intervals along its longitudinal direction. ,, WU is a push-up frame that is disposed in the work room uo so that it can move freely in the direction of arrow (A) Q3), and at its four corners there are U-shaped bars (
19A) is provided with a protrusion (21A) that fits into the inside.

Is (a) an push-up frame? A tapered tube (14
) and a single tube C41*42.45...) are fixed to the passage holes, and in this embodiment, notches are formed at every 90°. (C) is a U-shaped frame fixed to the outer circumferential surface of the ring pen facing each notch opening @, (C) is an arrow (C) inside the U-shaped frame (C) (moveable in the DJ direction). The presser block is arranged so that the opposing surface inside the ring (A) is an arcuate surface, and the arcuate surface has a tapered pipe α→
and monotube (4,.

42, 43...) are formed with grooves that fit into the protrusions (A) fixed every 90' on the lower part of the outer peripheral surface. (c)
is screwed into the screw hole formed in the center of each U-shape #■, and the tip is rotatably connected to each presser block (A).The ring is attached to each support α. Pole rod (1
The piece (31), which is a hydraulic cylinder disposed in the 'lA) and fixed to the lower surface of the main body, is connected with a pin to the bracket (c) of each protrusion (21A) of the push-up frame &1).

(33) (2) is a pin that is inserted into the pin hole (A) of the rod rod (1 arc) of each support column α, and the upper pin hole is inserted through the tip of the piston rod of the hydraulic cylinder. The holes are externally fitted, and the through holes of the protrusion (21A) are externally fitted onto the lower pin. (3'7) is a height adjustment jack disposed on the inclined end surface (10A) of the working chamber αQ, and (c) is an alignment jack disposed on the inclined side surface (IOB) of the working chamber 0Q. Note that an automatic welding device (not shown) is installed in the work room αQ. In FIG. 10, the spit is a mortar filling nozzle formed in each single pipe (41-42+45...), and the tile is a mortar supply pipe connected to the nozzle (to).

The installation procedure of the iron pipe (4) will be explained based on the above configuration.

First, the transport cart (2) carrying the tapered pipe α force is transported to the lower tunnel α.
υ to the front of the working chamber Q (1), then lift the tapered pipe (1) with the special chain block (41) shown in Fig. 11, and lift the tapered pipe (14) as shown in Fig. 12.
Pass it to Jyatsuki (3η (381). Next, press the lower pin (
34), the piston rod of the hydraulic cylinder (to) is extended, and the push-up frame c21) is moved in the direction of arrow (2). Next, fix the lower pin 04] in the pin hole (E) and the through hole (push-up frame +21 by inserting it into the slot), then remove the upper pin (33) and fix the piston of the hydraulic cylinder (7). Reduce the rod, and then insert the KJx pin into the pin hole (a) and the through hole □□□ to connect the piston rod to the support column o1. By reversing this movement, the push-up frame &1) is moved in the direction of the arrow opening like a so-called inchworm, and the push-up frame c2]) is opposed to the protrusion as shown in FIG. Next, turn the handle (A) to move each presser block in the direction of the arrow (D) to press it against the tapered pipe αa, and to fit the groove (A) into the protrusion (C). Next, the push-up frame R is moved in the direction of the arrow (color) by an operation opposite to that described above. Next, in the same manner as above, put the first single pipe (4,) from the lower tunnel Ql) into the working chamber aQ, and jack it (3η
(to) hand over. Next, as shown in FIG. 14, the alignment jack is operated to make the first single pipe (4,) concentric with the tapered pipe α4, and the height adjustment jack e171 is used to make the first single pipe (4,) concentric with the tapered pipe α4.
Lift the single pipe (41) and bring its upper end into contact with the lower end of the tapered pipe α→. Next, an automatic welding device welds the contact portion between the tapered pipe 0→ and the first single pipe (4,). Next, the Hendl wire is passed backwards to each block') to separate it from the tapered tube α force. Next, move the push-up frame eη in the arrow opening direction,
Each block (C) is brought into contact with the first wheel pipe (4,), and the groove (roller) is fitted into the protrusion (E). Next, push up frame C2
1) in the direction of arrow B1 and insert the tapered tube α force into the inclined shaft (1) as shown in FIG.
A space 142 between the lower end of the pipe and the tapered pipe α→ is partitioned by a partition plate old, and a concrete pouring pipe (441
More concrete (place concrete).

Next, weld the second single pipe (42) to the first single pipe (4,) in the same manner as above, and press the tapered pipe α4 and the first and second single pipes (4,) (4□). concrete (4) in the space t42. By repeating the above operations, the iron pipe (4) is placed in the inclined shaft (1), and then the concrete (4 uniform and iron pipe) is placed in the inclined shaft (1). The installation work is completed by filling mortar into the gap 6) from each nozzle 139). In addition, due to the action of tapered pipe a4, each single pipe (4, '42
．． 45...) and the concrete IJ-) (Since a gap is created between the conc.

As described above, according to the present invention, the following effects can be obtained.

(Power) Concrete can be placed in the inclined shaft in parallel with the work of joining the single pipe to the lower end of the tapered pipe or single pipe that has already been pushed up, improving work efficiency.

(b) Since tapered pipes and single pipes can always be joined in the same work room, even if an automatic welding machine is installed in the work room, it will be extremely easy to handle, and we can expect an improvement in welding quality.

(1) The work space in the work room can be sufficiently overlooked, the footing is stable, and workers will not fall, improving safety.

(b) Since the inner diameter of the lower shaft only needs to be made slightly larger than the outer diameter of the tapered pipe and single pipe to be installed, the cost of tunnel excavation can be reduced.

(3) It is easy for workers to get to the work room.

(Power) It is easy to work and transport equipment and materials to the work room.

(G) Ventilation of the work room is also easy because the location is fixed. Therefore, it is also favorable from the viewpoint of environmental hygiene.

That is, when the construction method of the present invention is implemented, it has the effect of improving work efficiency, welding quality, safety, work environment, and economic efficiency compared to conventional construction methods.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing a conventional example, FIG. 2 and the following figures show an embodiment of the present invention.
Figure 3 is a longitudinal sectional view of the working room, Figure 4 is a longitudinal sectional view of the main parts,
Figure 5 is a view from the v-■ arrow in Figure 3, and Figure 6 is a view from ■- in Figure 3.
VI arrow view, Fig. 7 is a view from V to ■ arrow in Fig. 6, Fig. 8 is a vertical sectional view of the tapered pipe portion, Fig. 9 is a view from IK4 arrow in Fig. 2, and Fig. 10 is a mortar view. The longitudinal sectional views of the filling nozzle portion, and FIGS. 11 to 15, are longitudinal sectional views showing the iron pipe installation procedure. (1)... Inclined shaft, (4)... Iron pipe, (44, 42,
4,...)...Single tube, αQ...Working chamber, Round...
Tapered pipe, 4... Support, φB... Push-up frame (jack-up equipment), Han... Presser foot pro-tsuku,... Hydraulic cylinder, m311341... Pin, η... Height 68 Adjustment jack, distortion... Alignment jack, (Toru...Concrete agent Yoshihiro Morimoto Fig. 3 Fig. 1θ Fig. 4t, 4z, 43-

Claims (1)

[Claims] 1. Form a working chamber at the lower end of the inclined shaft, install jacking equipment in the working chamber, bring a tapered pipe whose upper head has a larger diameter than the lower end from the lower tunnel into the working chamber, and jack up the tapered pipe. The first single pipe is pushed up by equipment and carried into the work chamber from the lower tunnel, and its upper end is joined to the lower end of the tapered pipe. Next, the first single pipe is pushed up by jack-up equipment and the tapered pipe is inserted into the inclined shaft. Then, concrete was poured between the tapered pipe and the inner surface of the inclined shaft, and then a second
The single pipe is brought in, its upper end is joined to the lower end of the first single pipe, and then the jack-up equipment is used to push up the second single pipe,
Concrete is placed between the tapered pipe and the inner surface of the inclined shaft, and in the same manner, each of the third and subsequent single pipes is sequentially carried into the work room, and the single pipes are joined together and pushed up using jack-up equipment to form the penstock into the inclined shaft. A penstock installation method using jack-up, which is characterized by installing a penstock and filling mortar between the penstock and the existing concrete.