JP2002295192A - Auxiliary tool for segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost. SOLUTION: A flexible valve body 2d of a check valve 2, which is mounted on a socket 1 by making an engaging piece 2a wind around to the inside of an engaging protrusion 1i, is curved outside the socket 1 by grouting pressure so as to be separated from a valve seat 1h. The valve body 2d, which makes grouting freely; is pressed against the valve seat 1h by back-flow pressure of an injected grout material in order to prevent the grout material from flowing back inward. The check valve 2 made of a synthetic resin, which is much thinner than a conventional rigid check valve of an inverted truncated cone shape, does not move in a direction of a central axis of the socket 1 so as to reduce constraints on the shape, structure, quality of a material, etc., of the socket 1. Accordingly, the socket 1 can be made of a synthetic resin in order to enable cost reduction. A protruding piece 2e enhances operability of the check valve 2 and increases strength of a bridging part to which flow pressure of the grout material is applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment auxiliary tool which is embedded in a segment and used for injecting grout material such as concrete into a gap between a segment and a wall (ground) of an excavation pit.

[0002]

2. Description of the Related Art In a shield method, it is sometimes necessary to replenish grout material in a gap formed between a segment and a ground. As a segment auxiliary tool which enables this, a cylindrical steel socket embedded in the segment, and a rod movably attached to the outer end of the socket in the direction of the center axis of the socket, so that the injection pressure of the grout material is increased. With a non-return valve with a rigid structure of an inverted truncated cone shape, which is separated from the socket to allow the grout material to be injected freely, and after the injection is completed, the grout material is pushed back to the socket to prevent the backflow of the grout material. Is known (Japanese Utility Model Publication No. 4-19114).

[0003]

The check valve of the conventional segment auxiliary tool described above is formed in an inverted frustoconical shape using a steel plate or the like, so that it takes a lot of time to manufacture and increases the cost. In addition, the structure is large, and the entire structure moves and opens and closes the socket in the direction of the center axis of the socket.Since a large installation space is required, there are great restrictions on the shape, structure, or material of the socket. There is a disadvantage that improvement is hindered.

[0004] It is an object of the present invention to provide a segment aid which can reduce costs. Another object of the present invention is to provide a segment assisting tool that can reduce the embedding width (height).

[0005]

In order to achieve at least one of the above-mentioned objects, according to the first aspect of the present invention, a valve seat is provided on an inner peripheral surface of a center hole at a base end, and the valve seat is provided with a valve seat. A socket having a plurality of engaging projections provided at intervals on the outside in the circumferential direction of the center hole, and a plurality of engaging pieces on the peripheral edge are engaged with the engaging projections of the socket to form a center hole of the socket. The flexible valve body provided in the flow hole is separated from the valve seat of the segment by the injection pressure of the grout material flowing toward the base end with the center hole of the socket mounted on the inside, and the grout material is freely injected. A check valve for contacting the flexible valve body with the valve seat to prevent backflow of the grout material is provided.

According to this means, the check valve mounted in the center hole of the socket with the engagement piece engaged with the engagement projection of the socket, and the flexible valve body is moved to the base of the socket by the injection pressure of the grout material. It bends to the end and separates it from the socket valve seat, allowing the grout material to flow. When the injected grout material is going to flow backward, the flexible valve body is pressed against the valve seat by the backflow pressure of the grout material, and the backflow of the grout material is prevented.

As described above, the structure is such that the check valve is not moved with respect to the socket, and the socket is opened and closed by bending deformation of only the flexible valve body. Further, the check valve can be manufactured thinly.
The installation space can be reduced. Therefore, restrictions on the shape, structure, material and the like of the socket are relaxed. Further, the check valve can be easily and inexpensively made of a synthetic resin or the like. The flexible valve element of the check valve is normally connected to the left and right sides of a bridging portion provided in the flow hole so as to be flexibly bent. in this case,
Providing a protruding piece on the outer surface of the bridge increases the strength of the check valve and improves operability. A female screw is usually formed in the center hole of the socket, but may not be formed.

In the auxiliary device for a segment according to the first aspect, it is preferable that the socket is made of a synthetic resin such as a nylon resin and that a rib is formed on a tapered outer peripheral surface which becomes thicker as approaching the base end. Claim 2). In this configuration, the ribs increase the strength of the socket and, together with the tapered shape of the outer peripheral surface of the socket, enhance the strength of pull-out of the socket with respect to the segment. Further, a rust-free socket can be manufactured at low cost.

When a female screw for screwing a hanging tool or the like into the center hole of the socket is formed, a female screw is formed only at an intermediate portion between the large-diameter base end and the small-diameter distal end to form a small-diameter distal end. If it is not formed, the load at the time of lifting will be dispersed to the tip side from the middle part where the hanging tool at the inner back is screwed, and it will not be concentrated only on the tip, so the predetermined strength Is obtained.

[0010] In the segment assisting device according to the first or second aspect, it is preferable that a plug that is detachably attached to the tip of the socket is provided (claim 3). In this configuration, after the grouting operation is completed, a plug is attached to the tip of the socket to close the center hole of the socket.

[0011] The shape of the plug head generally matches the shape of the opening of the hole of the segment in which the socket is embedded, and the plug head is attached to the inner peripheral surface of the segment with the plug attached to the socket. Make it flush.

[0012]

Embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 10 show an embodiment of a segment auxiliary tool according to the present invention. The segment auxiliary tool is a socket 1 made of synthetic resin such as nylon resin.
And a check valve 2 and a plug 3.

The socket 1 has a tapered outer peripheral surface 1a that gradually becomes thinner as it approaches the distal end S from the proximal end K.
A large number (6 in the figure) of horizontal ribs 1b in the circumferential direction and a large number (4 in the figure) of vertical ribs 1c in the axial direction are formed.
While a female screw 1e is formed on the inner peripheral surface of the intermediate portion T of the center hole 1d, a plurality of sets (six sets in the figure) of the locking rim 1f and the release portion 1g are formed on the inner peripheral surface of the tip S of the center hole 1d. Are formed at equal intervals adjacent to each other in the circumferential direction, and a valve seat 1h and a plurality of (three in the figure) engaging projections 1i are formed on the inner peripheral surface of the base end K of the center hole 1d. Consisting of The engaging projections 1i are formed at intervals in the circumferential direction of the center hole 1d. The cross-sectional shape of the socket 1 is circular.

The check valve 2 has a plurality of (three in the figure) engaging pieces 2a formed on a peripheral edge thereof and a check hole 2a.
b, flexible valve bodies 2d are respectively connected to the left and right sides of the bridging portion 2c erected on the bridge portion 2b so as to be flexibly bent.
e.

The check valve 2 pushes the engaging pieces 2a into the socket 1 by positioning the engaging pieces 2a between the engaging projections 1i, 1i of the socket 1 as shown in FIG. The attachment piece 2a can be turned inside the engaging projection 1i and attached to the socket 1. Flexible valve element 2 of check valve 2
d is the valve seat 1h of the socket 1 when the check valve 2 is mounted as described above.
And closes the flow hole 2b, and as shown in FIGS. 5 and 6, flexes outward and separates from the valve seat 1h to open the flow hole 2b.

The plug 3 has a circular frustoconical head 3b formed at one end of a circular body 3a, and a pair of locking edges 1f and release portions 1g of the socket 1 at the other end. The same number of hook-shaped locking claws 3c are formed, and a wrench hole 3d is formed on the outer surface of the head 3b. The shape of the head 3b of the plug 3 is the shape of the hole 5a of the segment 5 in which the socket 1 is embedded.
Of the opening on the inner peripheral side. Reference numeral 7 denotes a seal ring fitted to the body 3a of the plug 3.

The locking edge 1f of the socket 1 locks the locking claw 3c of the plug 3 slightly deformed by press-fitting into the center hole 1d, and the plug 3 is inserted into the socket 1 with the center hole 1d closed. It is fixed. In addition, the release unit 1g
A locking claw 3c which has an inclined guide surface 1gm on one side and which is shifted by the clockwise rotation of the plug 3 with respect to the socket 1 in FIG. 3 is guided to the inner surface of the center hole 1d by the inclined guide surface 1gm. It is to be removed from the edge 1f. The surface 1gn of the release portion 1g on the side opposite to the inclined guide surface 1gm is substantially vertical, and prevents the locking claw 3c in FIG. 3 from rotating counterclockwise.

As shown in FIG. 1, the socket 1 having the above-described structure has a large diameter base end K on the outer peripheral side (upper side in the figure) at a hole 5a penetrating the front and back surfaces of the concrete segment 5. Also, the small diameter tip S is embedded and used in a state of being arranged on the inner peripheral side.

When the segment 5 is hoisted by a hoist, the hoist is screwed into the female screw 1e of the socket 1 from the tip S side, and the hoist is lifted and lifted.
It goes without saying that the lifting of the segment 5 is performed with the inner peripheral side facing upward.

At this time, a pulling force acts on the socket 1 to pull the socket 1 toward the distal end S. The outer peripheral surface 1a is formed into a tapered shape having a large diameter on the base end K side, and the outer peripheral surface 1a is formed. Since the ribs 1b and 1c are formed in the ribs to enhance the fixing force with concrete, sufficient fixing strength to withstand lifting can be obtained. The horizontal rib 1b mainly works to strengthen the lifting fixing force, and the vertical rib 1c prevents free rotation of the socket 1 when screwing the hanging tool.

Further, the female screw 1e is not formed in the center hole 1d of the tip S portion, and the load at the time of lifting the segment is increased from the middle portion T of the inner deep portion where the hanger is screwed to the tip S.
Since it is dispersed and added to the side and does not concentrate on only the tip, a predetermined strength can be reliably obtained.

The mounting of the check valve 2 on the socket 1 is performed as described above. At this time, when the protruding piece 2e is pinched and operated with a finger or the like, it can be easily mounted.

When the grout material is replenished into the gap between the ground and the segment 5, the grout discharge port of the injection machine is connected to the tip S side of the socket 1 as in the prior art.

The flexible valve body 2d of the check valve 2 is bent out of the socket 1 by the injection pressure of the grout material as shown in FIGS. 5 and 6 and separates from the valve seat 1h, so that the grout material can be freely injected. ,
Further, the grout material is pressed against the valve seat 1h by the backflow pressure of the grout material to prevent backflow of the grout material inward.

The check valve 2 is very thin as compared with the conventional rigid reverse check valve having the shape of a truncated cone, and does not move in the direction of the center axis of the socket 1, so that the shape, structure and material of the socket 1 are restricted. And the above effect can be enhanced by forming the female screw 1e close to the base end K without forming the female screw 1e at the front end S.
The protruding piece 2e improves the operability of the check valve 2 and also increases the strength of the bridging portion 2c to which the flow pressure of the grout material is applied.

When closing the socket 1 with the plug 3,
The locking claw 3c of the plug 3 is pressed firmly into the center hole 1d, and the plug 3 is slightly rotated counterclockwise in FIG. By this operation, each locking claw 3c having a tapered outer surface is slightly bent inward and enters the center hole 1d, and is elastically deformed outward by the subsequent counterclockwise rotation of the plug 3 so that the release portion 1g is released. 1g of surface
n, and is securely locked to the locking edge 1f of the socket 1. Further, the seal ring 7 is press-fitted into the center hole 1d to make the portion liquid-tight.

In the above-mentioned closed state, the head 3b of the plug 3
Are flush with the inner surface of the segment 5. Therefore, the appearance is not impaired, and when the tunnel is a water channel, water does not stay in the hole 5 a of the segment 5.

To remove the plug 3 in the closed state from the socket 1, a wrench is fitted into the wrench hole 3d, and the plug 3 is rotated clockwise in FIG. As a result, the locking claw 3c of the plug 3 moves along the inclined guide surface 1gm of the release portion 1g, gradually reduces its diameter, and is removed from the locking edge 1f, so that the plug 3 is pulled down in FIG. . In the case of the segment assisting device shown in the figure, the rotation angle required for removing the plug 3 is at most about 30 degrees, and it does not take much trouble as in the case of closing.

Since the socket 1, the check valve 2 and the plug 3 are made of synthetic resin, they can be manufactured accurately, easily and inexpensively, even if their shapes are somewhat complicated.

If the corners of the valleys and ridges of the female screw 1e of the socket 1 are formed in an arc shape having a radius of, for example, about 1 to 4 mm, the concentration of stress on the corners is prevented, which is good.

The socket 1 and the plug 3 can be made of metal. In the case of an auxiliary tool dedicated to grout material injection, the female screw 1e may not be formed in the socket 1 in some cases.

The number of the engaging projections 1i and the engaging pieces 2a, the number of sets of the locking rim 1f and the releasing portion 1g, and the number of the locking claws 3c may be any number as long as it is two or more. A plurality of wrench holes 3d may be formed in the outer peripheral portion of the plug 3 as shown by a two-dot chain line in FIG.

[0033]

As described above, according to the first aspect of the present invention, the space for assembling the check valve can be reduced, so that the restrictions on the shape, structure, material and the like of the socket are alleviated and the cost is reduced. Can be obtained.

[0034] In the auxiliary device for a segment according to the first aspect, the socket is made of a synthetic resin such as a nylon resin, and a rib is formed on a tapered outer peripheral surface which becomes thicker as approaching the base end. It is possible to provide an inexpensive segment assisting tool using a socket that has a strong pull-out fixing strength of the socket and that does not rust.

According to the first or second aspect of the present invention, in the structure having a plug detachably attached to the end of the socket, the socket can be completely closed with the plug after the grouting operation is completed. It becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a segment auxiliary tool according to the present invention.

FIG. 2 is a cross-sectional view of a socket of the segment auxiliary tool of FIG. 1;

FIG. 3 is a sectional view of a portion (III-III) in FIG. 2;

FIG. 4 is a plan view showing a state in which a check valve is ready to be attached to a socket.

FIG. 5 is a plan view showing an open state of a check valve.

FIG. 6 is also a sectional view.

FIG. 7 is a plan view of a plug of the segment aid of FIG. 1;

FIG. 8 is a front view of the plug of FIG. 7;

FIG. 9 is a cross-sectional view of a portion (IX-IX) in FIG. 7;

FIG. 10 is a bottom view of the plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Socket 1a Outer peripheral surface 1b Horizontal rib 1c Vertical rib 1d Center hole 1e Female screw 1h Valve seat 1i Engagement protrusion 2 Check valve 2a Engagement piece 2b Flow hole 2c Bridge part 2d Flexible valve element 2e Protrusion piece 3 Plug K Base end T Middle part S Top

Continuing from the front page (72) Inventor Hirohide Hashimoto 1-12-1, Yurakucho, Chiyoda-ku, Tokyo Inside Ishikawajima Construction Materials Industry Co., Ltd. (72) Inventor Munetaka 1-12-1, Yurakucho, Chiyoda-ku, Tokyo Ishikawajima Building Materials Industrial Co., Ltd. F term (reference) 2D055 BA01 EB01 GB01 JA01

Claims (3)

[Claims] 1. A socket having a valve seat provided on an inner peripheral surface of a center hole at a base end, and a plurality of engaging projections provided outside the valve seat at intervals in a circumferential direction of the center hole. A plurality of engaging pieces on the peripheral edge are engaged with the engaging projections of the socket, and are mounted in the center hole of the socket, and the flow holes are formed by the injection pressure of the grout material flowing toward the base end of the socket. A flexible valve body provided on the segment is separated from the valve seat of the segment to allow the grout material to be injected freely, and a check valve for preventing the backflow of the grout material by contacting the flexible valve body with the valve seat. An auxiliary tool for a segment, comprising: 2. The segment assisting device according to claim 1, wherein the socket is made of a synthetic resin such as a nylon resin, and a rib is formed on a tapered outer peripheral surface that becomes thicker as approaching the base end. . 3. A plug according to claim 1, further comprising a plug detachably attached to a tip of the socket.
Auxiliary tool for the described segment.