JP3484558B2 - Method of forming slide center and grout injection hole for tunnel lining - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide lining for tunnel lining and a method for forming grout injection holes.

[0002]

2. Description of the Related Art In order to improve the ground around a tunnel lined with concrete, a method of forming a hole for grout injection from the inside of the tunnel to the ground around the tunnel and injecting grout is widely known. ing. Specifically, first, a slide center is placed at a predetermined position in the excavation pit, and the surrounding rock is covered with concrete to construct a tunnel. After lining the excavation hole, a hole for grout injection is formed from the inside of the tunnel by a boring machine. The pipe material is inserted into the hole thus formed, and the grout is injected into the ground through the pipe material. It is known that the above process improves and reinforces the ground around the tunnel to give strength to the ground. At this time, in order to effectively improve the ground around the tunnel, it is necessary to accurately drill all the holes for grout injection according to the set angle.

[0003]

The formation of the above-mentioned conventional grout injection hole has the following problems. <B> By design, for grouting, for example, lining 1
Although it will be perforated at 23 places within the span (L = 6.0 m), since the double reinforcing bars are arranged in the lining concrete, the reinforcing bars may be cut by the perforation. In this case, it is conceivable to prevent the rebar from being cut by piercing the pipe material as a guide, but for that purpose, it is necessary to install a pipe material such as a gas pipe in advance. Therefore, positioning for drilling the grout injection hole for inserting the pipe material over the entire length of the tunnel to be constructed,
It requires a great deal of labor such as setting the drilling angle. <B> Since the installation angle (inclination angle) of the pipe material for grout injection is set for each grout injection hole, the angle can be adjusted each time the grout injection hole for inserting each gas pipe is drilled. Will be needed. However, the installation angle (tilt angle) of the grout injection hole in the narrow tunnel lining
It is very difficult to form accurately according to <C> When all pipe materials are installed in each grout injection hole, installation work is performed within a narrow tunnel lining, so it is expected that material loss will occur due to installation errors, etc., which is uneconomical. I cannot avoid becoming. The present invention has been made to solve the above problems, and an object of the present invention is to facilitate formation of the grout injection hole and increase the efficiency of ground improvement work by forming a guide apparatus for forming the grout injection hole. Another object of the present invention is to provide a method for forming grout injection holes.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to a slide center for tunnel lining, wherein a plurality of holes are formed so as to penetrate from the inner circumference to the outer circumference of the form part of the slide center, and the holes are formed in the holes. A slide centle for tunnel lining, characterized in that it is provided with a plurality of box-extracting members that can be inserted and removed freely and project from the outer circumference of the slide centle, thereby providing a guide space for the grout injection hole. . In addition, in the above-mentioned slide centle for tunnel lining, a plurality of holes penetrating from the inner circumference to the outer circumference of the form part of the slide centle are formed at positions according to the set angle of the grout injection hole. It is a slide center for tunnel lining. Furthermore, in the above-mentioned tunnel centrifuge slide center, a plurality of holes penetrating from the inner circumference to the outer circumference of the mold portion of the slide centr is characterized by attaching a lock mechanism for fixing the box-extracting material, It is a slide center for tunnel lining. Also, in the method of forming a grout injection hole for injecting grout into the ground to improve and reinforce the ground around the constructed tunnel, the excavated tunnel is lined and the guide space for the grout injection hole is formed. In order to form it, the slide lining for tunnel lining mentioned above is installed in the tunnel, and the box-extracting material of the designed winding thickness is projected and fixed in the hole formed in the slide lining for tunnel lining. The method for forming a grout injection hole is characterized in that after the tunnel is lined, the box extraction material is removed from the slide center and the grout injection hole is formed along the guide space formed by the box extraction material. . Further, in the method for forming the grout injection hole described above, the method for forming the grout injection hole is characterized by preventing the adhesion of concrete by coating a box-extracting material that is inserted into the hole formed in the slide center with a coating material. Is.

[0005]

Embodiment 1 of the present invention will be described below with reference to the drawings.

<B> Overall Configuration As shown in FIG. 1, a slide lining slide 1 for tunnel lining of the present invention comprises a slide center 10 serving as a lining frame for a tunnel 2 and an outer peripheral surface 101 of the slide center 10. It is composed of a box-extracting member 3 which is installed so as to project outward.

<B> Slide Centle The slide centle 10 is provided with a concrete formwork to be placed when the tunnel 2 is lined and a grout injection hole 4 used to reinforce and improve the ground around the tunnel. This is a member for forming the guide space 5 used when performing. As the slide center 10, a well-known slide center having a plurality of holes 11 penetrating the outer circumference and the inner circumference is used. The hole 11 formed in the slide center 10 is a hole 11 for guiding and inserting the box-extracting member 3 described later. As shown in FIG. 4, the hole 11 serves, for example, as a guide when inserting a box removing material 3 which will be described later.
Have 11. The holes 11 of the slide center 10 need not be formed at random, but according to the set angle for forming the grout injection holes 4.

As the setting position for forming the grout injection hole 4, for example, as shown in FIG. 1, it is considered that a pattern having a plurality of angles is appropriately selected and combined according to the situation of the ground. Further, the hole 11 of the slide center 10 allows not only the box-extracting member 3 described later to be inserted but also fixing. Therefore, the guide pipe 111 of the hole 11 has a lock mechanism 112 that can fix the box extraction material 3 at a predetermined position. As the lock mechanism 112 of each hole 11, a known fixing means can be adopted. For example, as shown in FIGS. 4 and 5, a screw hole may be formed around the opening of the guide pipe 111 located on the inner circumference of the slide center 10, and a bolt may be screwed into the screw hole to fix the box extraction member 3. Conceivable.

<C> Box-Extracting Material The box-extracting material 3 constituting the present invention has the guide space 5 for forming the grout injection hole 4 between the outer peripheral surface 101 of the slide center 10 and the tunnel peripheral surface 21. It is a member for forming. The box-extracting member 3 may be a known member such as a pipe member as long as it can be inserted through the holes 11 of the slide center 10 described above and can form the guide space 5 when the grout injection hole 4 is formed. be able to. When the box-extracting member 3 is inserted into the holes 11 of the slide center 10, it is at least more reliably than the slide center 10 in the tunnel peripheral surface 2.
It must have a total length of up to 1. That is,
Outer peripheral surface 101 of slide center 10 and tunnel peripheral surface 2
By arranging the box-extracting material 3 over the lining thickness which is between 1 and 1, a guide space 5 for forming the grout injection hole 4 at the time of pouring concrete is formed.

[0010]

The method of forming the grout injection hole according to the present invention will be described below.

<a> Installation of slide center for tunnel lining When the tunnel 2 is lining, concrete 6 is placed on the surface 21 of the tunnel 2 formed in the ground by various excavators and the lining is performed. By arranging the slide lining 1 for tunnel lining at a predetermined position of the tunnel 2, the lining of the tunnel 2 and the formation of the guide space 5 of the grout injection hole 4 are simultaneously performed. The slide lining 1 for tunnel lining can be moved, for example, in the same manner as a conventional slide lining. That is, a method is conceivable in which the rail 7 is drawn into the tunnel 2 and the slide center 10 having wheels (not shown) attached to the bottom is placed on the rail 7 and moved. The slide lining 1 for tunnel lining is moved to a position where concrete 6 is placed for lining the tunnel 2 and installed.

<B> Arrangement of the material removed from the box As shown in FIG. 4, a slide center 1 for tunnel lining
After being installed at a predetermined position, the box removing material 3 is inserted into each hole 11 formed in the slide center 10. Unboxing material 3 is
Since the adhesion of the concrete 6 makes it difficult to collect it, it is conceivable to coat the surrounding material with a covering material 31 such as vinyl in advance to facilitate the peeling from the concrete. The box-extracting material 3 coated with the coating material 31 is
It is inserted into the hole 11 formed in the slide center 10 and projected from the inside of the slide center 10 until it reaches the tunnel peripheral surface 21. When the box blank 3 reaches the tunnel peripheral surface 21, the box blank 3 is fixed by the lock mechanism 112 formed in the guide pipe 111 of the hole 11. Through the above steps, after the concrete 6 has been cast, the thickness between the tunnel peripheral surface 21 and the slide center 10 outer peripheral surface 101,
It is possible to form the guide space 5 for forming the grout injection hole.

<C> Concrete Casting Concrete 6 is cast between the outer peripheral surface 101 of the slide center 10 in which the box-extracting material 3 is arranged in each hole 11 and the tunnel peripheral surface 21. As a result, a lining is provided between the tunnel peripheral surface 21 and the outer peripheral surface 101 of the slide center 10.

<D> Removal of Box-Extracting Material As shown in FIG. 5, after the concrete 5 for lining the tunnel 2 is solidified and cured, the box-extracting material 3 is inserted through the holes 11 of the slide center 10. To remove all. Since the box material 3 to be removed is coated with a covering material 31 such as vinyl in advance, it can be easily separated from the concrete 5.
A guide space 4 for forming a grout injection hole is formed in a trace of removing the box material 3. The removed box material 3 can be reused at the next tunnel lining.

<E> Formation of grout injection hole After forming the guide space 5 for forming the grout injection hole 4 by the above-described process, the grout injection hole 4 is formed as shown in FIG.
To form. The grout injection hole 4 is formed by using a known punching device 8. First, the perforation part 81 of the perforation device 8 is inserted and arranged in the formation guide space 5 of the grout injection hole 4 formed by the box-cut material 3 when the concrete 5 is poured to construct the tunnel lining. Formation of the grout injection hole 4 Since the guide space 5 is formed in advance by setting an angle for forming the grout injection hole 4, the grout injection hole 4 can be formed by drilling along the guide space 5. .

[0016]

Since the present invention is as described above, the following effects can be obtained. <A> According to the present invention, a guide in which a position and an angle at which a grout injection hole is formed is set in advance is formed by using a material removed from a box. Therefore, it does not require much labor such as positioning for forming the grout injection hole and setting the perforation angle, which has been conventionally required. <B> As described above, according to the present invention, the guide in which the position and the angle for forming the grout injection hole are set in advance is formed by using the box-extracting material. Therefore, even in a narrow tunnel lining, the grout injection hole can be installed at an angle (tilt angle).
It is easy to pierce accurately according to the above. <C> Since a guide with the position and angle of the grout injection hole set beforehand is formed, installation mistakes do not occur even in a narrow tunnel lining, and material loss does not occur, so economical drilling work Can be implemented. <D> It is possible to confirm the filling status of the lining concrete after the equipment is demolded from the part where the box removal material has been removed. <E> Since each member according to the present invention can be diverted to form the grout injection hole, the material cost can be reduced and it is economical.

[Brief description of drawings]

FIG. 1 is an illustration of a slide lining for tunnel lining according to the present invention.

[Fig. 2] Explanatory cross-sectional view when arranging materials in a box

FIG. 3 is an explanatory cross-sectional view when forming a grout injection hole.

[Fig. 4] Partially enlarged view of the tunnel cross-section when the material is removed from the box.

FIG. 5 Partially enlarged view of the cross section of the tunnel lining

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-84198 (JP, A) JP-A-59-203198 (JP, A) Actual development Shou-60-111995 (JP, U) (58) Investigation Field (Int.Cl. ⁷ , DB name) E21D 11/10 E21D 11/00

Claims (5)

(57) [Claims] 1. A slide centle for tunnel lining, wherein a plurality of holes are formed so as to penetrate from the inner circumference to the outer circumference of the form part of the slide centre, and the slide centle is inserted into the holes so as to be able to move back and forth. A slide lining for tunnel lining, characterized in that it is provided with a guide space for grouting holes by being configured with a plurality of box-extracting members that protrude from the outer periphery. 2. The slide lining for tunnel lining according to claim 1, wherein a plurality of holes penetrating from the inner circumference to the outer circumference of the mold part of the slide centre are positioned in accordance with the set angle of the grout injection holes. A slide center for tunnel linings, which is characterized by being formed on. 3. The slide lining for tunnel lining according to claim 1 or 2, wherein a lock mechanism for fixing the box-extracting member to a plurality of holes penetrating from the inner periphery to the outer periphery of the mold portion of the slide center. A slide center for tunnel lining, which is equipped with. 4. The ground around the constructed tunnel is improved.
In a method of forming a grout injection hole for injecting grout into a ground for reinforcement, in order to line an excavated tunnel and to form a drill guide hole for the grout injection hole, it is disclosed in claims 1 to 3. The slide lining for tunnel lining is installed in the tunnel, and in the hole formed in the slide lining for tunnel lining,
Fix the box-cut material of the design winding thickness protruding from the inside of the slide center, remove the box-cut material from the slide-centle after lining the tunnel, and grout along the guide space formed by the box-cut material. A method of forming a grout injection hole, which comprises forming a hole. 5. The method of forming a grout injection hole according to claim 4, wherein the box-extracting material that is inserted into the hole formed in the slide center is covered with a covering material to prevent adhesion of concrete. , Method for forming grout injection hole.