JP4203567B2 - Lock bolt pressurization / expansion method - Google Patents

Description

  The present invention relates to a method for efficiently pressurizing and expanding a plurality of steel pipe expansion type lock bolts inserted into holes provided in a rock mass.

In recent years, tubular steel pipe expansion type lock bolts have come to be used in place of conventional bar-shaped rock bolts in order to quickly stabilize rocks and grounds that tend to collapse or have a lot of spring water.
For example, as seen in Patent Document 1, a rock bolt made of steel pipe having a concave portion for expansion in the longitudinal direction, a front end portion closed, and a sleeve for pressurizing fluid press-fitting on a rear end portion is provided on the rock mass. Inserting into the hole, pressurizing the pressurized fluid from the pressurized fluid injection hole made on the side of the sleeve, pressurizing and expanding the steel pipe and bringing it into close contact with the hole to try to consolidate the rock and ground with the steel pipe Is.
In addition to Patent Document 1, various devices have been proposed and used as devices for expanding a steel pipe expansion type lock bolt.

The present applicant has also proposed a seal head for inflating a steel pipe expansion type lock bolt and a high-pressure water supply device in Patent Documents 2 and 3 and the like.
In Patent Document 2, as shown in FIG. 1, the lock bolt pressurizing / expanding seal head is fitted to and held in individual sleeves placed on the lock bolts, and the fluid inlets of the individual seal heads are held. A plurality of pressurized fluid supply pipes 3 each connected to a fluid inlet of a lock bolt pressurizing / expanding seal head are connected to a water supply port of the branch block 2, It has been proposed to pressurize and expand a plurality of lock bolts by pressurizing pressurized fluid from the high-pressure water supply device 1 into the branch block 2.

Japanese Patent Publication No.2-5238 Japanese Patent Application No. 2002-173318 Japanese Patent Application No. 2003-73332

  By the way, when the pressurized fluid supply pipes 3 connected to the fluid inlets of the individual seal heads are individually connected to the water supply ports of the branch block 2, each pressurized fluid supply pipe 3 has a required length from the branch block 2. The total length is longer. Further, the pressurized fluid supply pipe 3 is in a state where it is branched separately from the branch block 2 fixed at an appropriate position. In random bolting in which rock bolts are intensively placed in unnatural areas, the length of each pressurized fluid supply pipe extending from the branch block is often relatively short, and this is not a problem. However, in a tunnel excavation site in which lock bolts are driven (pattern bolting) at predetermined intervals as shown in FIG. It becomes a mixed situation, and the handleability of the pressurized fluid supply pipe 3 is not necessarily good.

  The present invention has been devised to solve such a problem. When pressurizing and expanding a plurality of steel pipe expansion type lock bolts, the total extension of the pressurized fluid supply pipe is shortened and branched. The present invention provides a method of concentrating the pressurized fluid supply pipes around the block and pressurizing and expanding them with good workability.

  In order to achieve the object of the lock bolt pressurizing / expanding method of the present invention, each of a plurality of lock bolt pressurizing / expanding seal heads is connected to one pressurized fluid supply pipe connected to a high pressure water supply device. Branch pressurized fluid supply pipes are connected at the nearest positions, and each branch pressurized fluid supply pipe is connected to an individual lock bolt pressurizing / expanding seal head via a three-way valve for high pressure water, By feeding pressurized fluid from the high-pressure water supply device to the one pressurized fluid supply pipe, the pressurized fluid is supplied to the plurality of lock bolt pressurizing / expanding seal heads, and the lock bolt pressurizing / expanding. A plurality of lock bolts to which a sealing head is attached are collectively pressurized and expanded.

In addition, two pressurized fluid supply pipes are connected to the branch block connected to the high-pressure water supply device, and are connected to respective tips of the pressurized fluid supply pipes via high-pressure water three-way valves, respectively. When pressurizing / expanding a plurality of lock bolts placed at appropriate intervals using a high-pressure water supply unit having a seal head for pressurizing / expanding lock bolts, pressurize / expand one lock bolt. While supplying high pressure water to the seal head to pressurize and expand one lock bolt, remove the lock head for pressurizing and expanding the lock bolt from the one lock bolt that has been previously pressurized and expanded, The removed lock bolt pressurizing / expanding seal head may be replaced with another non-pressurized lock bolt, and high pressure water may be sequentially supplied to a plurality of lock bolts placed at appropriate intervals.
Further, a plurality of (for example, two) branch pressurized fluid supply pipes are connected to each of the two pressurized fluid supply pipes connected to the branch block, and a lock bolt pressurizing / expansion seal head is connected to each. The high pressure water supply unit may be used to supply high pressure water to, for example, two seal heads, and pressurize and expand a plurality of lock bolts, for example, two by two.

  According to the present invention, when trying to pressurize and expand a plurality of lock bolts, a branch branched from a single pressurized fluid supply pipe at a position closest to the individual lock bolt pressurizing / expanding seal head Since the pressurized fluid supply pipe is connected to each seal head, the total extension of the pressurized fluid supply pipe is shortened (see FIG. 3). Further, as shown in FIG. 4, the arrangement state of the pressurized fluid supply pipe at the site is simplified, and the entire operation is facilitated.

In addition, two pressurized fluid supply pipes are connected to the branch block connected to the high pressure water supply device, and a lock bolt pressurization / expansion seal is connected to the end of each pressurized fluid supply pipe via a high pressure water three-way valve. Since the head is connected, preparatory work such as attaching the seal head to the next lock bolt when one lock bolt is pressurized and expanded by switching the three-way valve for high pressure water Two lock bolt pressurizing / expanding seal heads can be used alternately to pressurize and expand a plurality of lock bolts one by one, and the capacity of the pressurized high pressure water supply device is relatively small However, the pressurization / expansion operation can be efficiently performed as a whole (see FIGS. 5 and 6).
Further, a plurality of branch pressurized fluid supply pipes are connected to the two pressurized fluid supply pipes connected to the branch block, and a lock bolt pressurizing / expanding seal head is attached to the tip of each branch pressurized fluid supply pipe. Can be used to more efficiently reinforce the rock mass by using multiple lock bolt pressurization / expansion seal heads connected to one pressurized fluid supply pipe in sequence. it can.

  In the first aspect of the present invention, a plurality of pressurized fluid supply pipes 3 connected to the high-pressure water supply device 1 are provided with a plurality of positions at positions closest to the individual lock bolt pressurizing / expanding seal heads 5. A branch pressurized fluid supply pipe is connected. The tip of each branch pressurized fluid supply pipe is connected to a high-pressure water connection port of a high-pressure water three-way valve 6 attached to a lock bolt pressurizing / expanding seal head 5. In the embodiment shown in FIG. 3, specifically, a T-shaped joint 4 is connected to the pressurized fluid supply pipe 3, one opening thereof is directly connected to the high-pressure water three-way valve 6, and the other Similarly, the pressurized fluid supply pipe 3 extending from the opening is sequentially connected to a T-shaped joint 4 connected to the three-way valve 6 for high-pressure water. Reference numeral 9 denotes a drain pipe connected to a high pressure water three-way valve for releasing the high pressure in the lock bolt after the pressurization / expansion is completed.

As the lock bolt pressurizing / expanding seal head 5, one having a self-holding function as proposed in Patent Document 2 is used in order to exert a holding function when fitted to the sleeve 8. It is preferable.
Further, in actual work, rock bolt insertion holes are drilled in the rock and ground to be reinforced, and the lock bolts 7 are sequentially inserted into the holes, and the inserted lock bolts 7 are sequentially pressurized and expanded. Work is done. Since the present invention is not characterized in drilling, the following will describe procedures for inserting the lock bolt 7 and pressurizing / expanding after drilling.

  First, with the three-way valve 6 for high-pressure water closed, that is, with the branch pressurized fluid supply pipe and the fluid inlet of the lock bolt pressurizing / expanding seal head 5 shut off, the lock bolt 7 (for example, After the lock bolt pressurizing / expanding seal head 5 is fitted and held on the sleeve 8 at the right end of the five in FIG. High pressure water is supplied to the seal head 5 for locking and expanding the lock bolt, and the lock bolt 7 (at the right end of the five in FIG. 3) is pressed and expanded. In this manner (from the right end to the left side in FIG. 3), the lock bolt 7 is sequentially inserted into the drilling hole, the lock bolt pressurizing / expanding seal head 5 is fitted, and the high pressure water three-way valve 6 is opened. Repeatedly, high pressure water is supplied to all the lock bolt pressurizing / expanding seal heads 5.

High pressure water is supplied to each lock bolt 7 through the three-way valve 6 for high pressure water that is sequentially opened. Eventually, the water pressures of the respective lock bolts 7 become substantially equal, and when the predetermined pressure is reached, the operation of the high-pressure water supply device 1 stops and a plurality of (five in FIG. 3) lock bolts 7 are provided. Pressurized and expanded.
Each of the three-way valves 6 for high-pressure water is operated to shut off the communication between the branch pressurized fluid supply pipe and the lock bolt pressurizing / expanding seal head 5 and the fluid inlet, and to open the drainage port. After releasing the residual pressure, the lock bolt pressurizing / expanding seal head 5 is removed from the sleeve 8. This operation is sequentially repeated for each lock bolt 7 to complete the pressurizing / expanding operation. After the end of the series of operations, the operation proceeds to the pressurizing / expanding operation of the next lock bolt (left half in FIG. 4).

Next, the second aspect of the present invention will be described.
In this embodiment, as shown in FIG. 5, two pressurized fluid supply pipes 3-1 and 3-2 are connected to the branch block 2 connected to the high-pressure water supply device 1, and each pressurization is performed. The tip of the fluid supply pipe is connected to the high-pressure water supply ports of the high-pressure water three-way valves 6-1 and 6-2 attached to the lock bolt pressurization / expansion seal heads 5-1 and 5-2.

  For example, first, the high-pressure water three-way valve 6-1 connected to the first pressurized fluid supply pipe 3-1 and the high-pressure water three-way valve 6- 6 connected to the second pressurized fluid supply pipe 3-2. 2 is closed, that is, set so as to block the fluid inlet of the pressurized fluid supply pipe and the lock bolt pressurizing / expanding seal head. Next, the lock bolt pressurizing / expanding seal head 5-1 connected to the first pressurized fluid supply pipe 3-1 is attached to the sleeve 8-1 of the lock bolt 7-1 inserted into the drilling hole. The high-pressure water three-way valve 6-1 is opened, that is, the high-pressure water supply device is operated by switching so that the fluid inflow port is communicated to supply high-pressure water to the lock bolt 7-1. Is pressurized and expanded. While the lock bolt 7-1 is pressurized and expanded, the lock bolt 7-2 to be pressurized and expanded next is inserted into the drilling hole and connected to the second pressurized fluid supply pipe 3-2. The lock bolt pressurizing / expanding seal head 5-2 is attached to the sleeve 8-2 of the lock bolt 7-2.

  Subsequently, the high pressure water three-way valve 6-2 connected to the second pressurized fluid supply pipe 3-2 is operated to pressurize the pressurized fluid supply pipe 3-2 and the lock head for pressurizing / expanding the lock bolt. -2 fluid communication port is connected, and pressurization / expansion of the lock bolt 7-2 is started. When the pressurization / expansion of the lock bolt 7-1 is completed, the pressurized fluid supply pipe is operated by operating the high-pressure water three-way valve 6-1 connected to the first pressurized fluid supply pipe 3-1. The communication between the 3-1 and the fluid inlet of the lock head for pressurizing / expanding the lock bolt 5-1 is shut off and the drain outlet is opened.

While pressurizing and expanding the lock bolt 7-2, the lock bolt pressurizing / expanding seal head 5-1 is removed from the lock bolt 7-1 and the next lock bolt 7-3 is inserted into the hole. Insert the lock bolt pressurizing / expanding seal head 5-1 into the lock bolt 7-3.
By repeating this series of operations, the plurality of lock bolts can be continuously pressed and expanded sequentially.

  In the lock bolt pressurization / expansion method in which two lock bolt pressurization / expansion seal heads are alternately replaced as described above, that is, two pressurization fluid supply pipes are alternately used. When a lock bolt pressurization / expansion seal head equipped with a high-pressure three-way valve is connected to each pressurized fluid supply pipe, one lock bolt is pressurized and expanded while the next lock bolt is Since the preparatory work can be performed and the downtime of the high-pressure water supply device can be shortened, the lock bolt pressurizing / expanding work can be efficiently performed as a whole.

  In addition, in the pressurizing / expanding method of the lock bolt in which the two pressurized fluid supply pipes are alternately used as described above, a plurality of pressurized fluid supply pipes are provided as in the first embodiment. (For example, two) branch pressurized fluid supply pipes, and a lock bolt pressurizing / expanding seal head having a three-way valve for high-pressure water at the tip of each branch pressurized fluid supply pipe it can. In this way, a plurality of (for example, two) lock bolts can be collectively pressurized and expanded, and the next preparatory work for, for example, two lock bolts can be performed. Pressurization and expansion work can be performed with extremely good work efficiency.

As described above, by the development of the lock bolt pressurizing / expanding method of the present invention, after the plurality of seal heads are mounted on the plurality of sleeves, the pressurized fluid supply pipes connected to the respective seal head fluid inlets If high-pressure water is fed from the high-pressure water supply device, a plurality of rock bolts can be pressurized and expanded together, so that the rock can be reinforced efficiently. Since the pressurized fluid supply pipe is not complicatedly arranged in the work site, the work efficiency is improved without interfering with the work.
In addition, by developing the second aspect of the present invention, a plurality of lock bolts can be pressed and expanded sequentially one by one (in some cases, a plurality of lock bolts) in order, so even a high-pressure water supply device with a small capacity can be efficiently used. Rock bolt pressurization and expansion work can be performed, and rock mass reinforcement work can be performed very efficiently. This leads to suppression of the progress of bedrock loosening and, consequently, improvement of the long-term stability of the bedrock. Furthermore, it is possible to reduce costs by shortening the work time.

The figure explaining the conventional method of pressurizing and expanding a plurality of lock bolts together Diagram explaining the arrangement of pressurized fluid supply pipes at the tunnel excavation site in the conventional method The figure explaining the method of this invention which pressurizes and expands several lock bolts collectively. The figure explaining the arrangement | positioning condition of the pressurized fluid supply pipe | tube of the tunnel excavation site by this invention method The figure explaining the method of pressurizing and expanding a plurality of lock bolts one by one one by one The figure explaining the arrangement situation of the pressurization fluid supply pipe in the tunnel excavation site when carrying out pressurization and expansion one by one sequentially

Explanation of symbols

1: High-pressure water supply device 2: Branch block 3: Pressurized fluid supply pipe
4: T type joint 5: Sealing head for lock bolt pressurization and expansion
6: Three-way valve for high pressure water 7: Lock bolt 8: Sleeve 9: Drain pipe

Claims (2)

  A branch pressurized fluid supply pipe is connected to a single pressurized fluid supply pipe connected to the high-pressure water supply device at a position closest to each of the plurality of lock bolt pressurizing / expanding seal heads. A pressurized fluid supply pipe is connected to each lock bolt pressurizing / expanding seal head via a three-way valve for high pressure water, and pressurized fluid is supplied from the high pressure water supply device to the one pressurized fluid supply pipe. By supplying pressure, pressurized fluid is supplied to a plurality of lock bolt pressurizing / expanding seal heads, and the plurality of lock bolts to which the lock bolt pressurizing / expanding seal heads are attached are collectively pressurized / expanded. A method for pressurizing and expanding a lock bolt.   Two pressurized fluid supply pipes are connected to the branch block connected to the high-pressure water supply device, and locks are connected to the respective tips of the pressurized fluid supply pipes via high-pressure water three-way valves, respectively. When pressurizing and expanding a plurality of lock bolts placed at appropriate intervals using a high pressure water supply unit having a bolt pressurizing / expanding seal head, a single lock bolt pressurizing / expanding seal head The high pressure water was supplied to pressurize and expand one lock bolt, and the lock bolt pressurization / expansion seal head was removed from the one lock bolt that had been previously pressurized and expanded. A lock characterized in that the lock bolt pressurizing / expanding seal head is replaced with another non-pressurized lock bolt, and high pressure water is sequentially supplied to a plurality of lock bolts placed at appropriate intervals. Belt pressurization and expansion method.

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