JP2517779Y2 - Grout injection hose for anchor construction - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grout injection hose for anchor construction.

[0002]

2. Description of the Related Art When constructing a ground anchor or the like,
There is a method of inserting the grout on the ground in advance to prepare the anchor trunk body, and then inserting it into the drilled hole, but this method increases the weight of the anchor body and loses flexibility, so However, there is a drawback that the insertion work becomes difficult. Therefore, as shown in FIG. 3, a construction method is adopted in which the sheath tube 4 is attached around the fixed length portion of the tension member 3 and is inserted into the drilled hole 5, and then the grout 51 is injected into and out of the sheath tube 4. There is a case. Also, JP-A-62-2114
No. 23 and Japanese Patent Laid-Open No. 62-2111464
The above-mentioned internal grout hose and external grout ho
A construction method using a single grout hose that doubles as a base
Are known. These construction methods are described below.
Inject grout in order . A glass with a tensile material
Place the grouting hose in the sheath tube, only the grouting hose
Position it so that it projects from the sheath tube . Of grout horse
From the discharge port formed near the tip, the outer circumference of the sheath tube and the hole wall
Inject grout between . The outer periphery of the sheet over the scan tube to the appropriate
After injecting the grout, place the obstruction in the grout hose.
Inserted, thereby forming at the end of the grout hose described above
The discharge port is closed . Sheath tube on grout hose
Yes and another discharge port is formed with a valve body which is operated by pressure in a predetermined position located within, and more to increase the internal pressure of the grout hose, the sheath tube to open the valve body
Inject grout .

[0003]

[Problems to be solved by the invention] In the case of the above construction method,
There are the following problems. That is, when the grout 51 is injected into the sheath tube 4, the internal grout hose 6 is used, and when the grout 51 is injected into the outside of the sheath tube 4, a separate external grout hose 61 is used. Is used. Therefore, the two grout hoses 6 and 61 are arranged in the sheath tube 4, and the cross-sectional area occupied by the grout hose in the cross section of the anchor trunk becomes large. As a result, the arrangement space for the tension members 3 becomes narrower, and the number or diameter of the tension members 3 must be reduced, and the design load of the anchor tendon becomes smaller.

[0004]

[Problems to be solved by the invention] In the case of the above construction method,
There are the following problems. That is, when injecting the grout 51 into the sheath tube 4, the internal grout hose 6 is used, and when injecting the grout 51 outside the sheath tube 4, a separate external grout hose 61 is used. Therefore, the two grout hoses 6 and 61 are arranged in the sheath tube 4, and the cross-sectional area occupied by the grout hose in the cross section of the anchor trunk increases. As a result, the space for disposing the tension members 3 becomes narrower, and the number or diameter of the tension members 3 must be reduced, and the design load of the uncurtain don becomes smaller. Also, with one grout hose
Even in the case of the construction method, the grout is performed before the outer circumference of the sheath tube.
Since the injection is performed, the sheath tube is deformed and the sheath tube
Inner circumference adheres to the tensile material contained in the sheath tube
There is a fear . Therefore, afterwards, the grout is placed inside the sheath tube.
Even after injecting, the amount of adhesion of the tensile material with the inner circumference of the sheath tube,
The grout does not adhere well to the tensile material,
It will reduce your power . In addition, the sheath tube
Work from grout injection to grout injection inside the sheath tube
When migrating, connect the outer circumference of the sheath tube to the grout hose.
Since it is necessary to work to close the discharge port,
It takes time .

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. <A> Overall structure of anchor-tendon (FIG. 1) The overall structure of anchor-tendon is configured as shown in FIG. That is, the required number of tensile members 3 such as PC stranded wire are bundled with the grout hose 1 of the present invention, and a sheath tube 4 such as a corrugated sheath is provided around the fixing long portion. And configure. The open ends of the sheathed sheath pipe 4 are the water stop parts 4
1, a tip cap 43 having a grout inlet 42 is attached to the tip of the anchor. In the tip cap 43, the grout hose 1
Penetrate the tip of the. An exhaust pipe 44 for discharging the air inside the sheath pipe 4 when the grout is injected into the sheath pipe 4 is connected to the water stop portion 41 on the tail end side.

<B> Structure of grout hose (FIG. 1) The grout hose 1 which is housed inside the sheath tube 4 together with the tension member 3 as described above is constructed as follows. An external injection port 11 for injecting grout to the outside of the sheath tube 4 is provided at the tip of the grout hose 1 penetrating into the tip cap 43.
To provide. The external inlet 11 is a tube grout
The open end of the sleeve 1 can be used. Then, at the external inlet 11, the injection of grout into the sheath tube 4 is completed,
When the internal pressure of the sheath tube 4 rises above a certain level, it is closed by the plug body 2 or the like that comes off. The plug 2 pops out when the internal pressure acting on the plug 2 exceeds the frictional resistance between the outer surface of the plug 2 and the inner surface of the grout hose 1. For example, 3-4kgf /
Design so that it will escape when a pressure of about cm2 is applied. Further, by appropriately selecting the diameter ratio or material of the plug body 2 and the grout hose 1, the pressure when the plug body 2 pops out can be adjusted. It should be noted that the external injection port 11 has a valve mechanism or the like that is opened by a certain pressure or more,
Other opening mechanism may be provided. On the other hand, the external inlet 1
An inner inlet 12 for injecting grout into the sheath pipe 4 is opened in the sheath pipe 4 slightly above 1 and closed by the water blocking portion 41.

[0007]

[Method of use] Next, a method of constructing an anchor using the grout hose of the present invention will be described. <A> Grout injection into sheath tube (Fig. 1) As shown in Fig. 1, the anchor tendon configured as described above is inserted into the drilled hole 5. Next, the grout 51 is pressure fed into the tube from the open end of the grout hose 1 above the ground. Then, since the external injection port 11 at the tip of the grout hose 1 is closed by the plug body 2, the grout 51 is injected into the sheath tube 4 through the internal injection port 12. The air in the sheath pipe 4 is exhausted to the outside through the exhaust pipe 44.

<D> Injecting grouting outside the sheath tube (FIG. 2) When the inside of the sheath tube 4 is filled with the grout 51 and the internal pressure of the sheath tube 4 reaches a predetermined pressure, the plug body 2 is closed. It pops out from the external inlet 11. Then, the grout 51 flows out from the external injection port 11, and the grout 51 can be filled into the space between the drilled hole 5 and the sheath pipe 4 through the injection port 42 of the tip cap 43.

[0009]

[Effects of the Invention] Since the invention is as described above, the following effects can be obtained. <A> In the present invention, it is possible to inject grout inside and outside the sheath tube with one grout hose. Therefore, the cross-sectional area of the grout hose occupying the anchor-trunk section decreases,
The number or diameter of the tensile members can be increased. Therefore, the design load of the anchor tendon can be increased.

<B> Since the design load of each uncurtain dong increases, the total number of uncurtain dongs can be reduced and the cost of the entire construction can be reduced. <C> Grout is injected prior to the inside of the sheath tube.
Since it is a grout hose for the
And the grout injection is performed.
The pipe is not deformed and attached to the tensile material . Obey
To secure sufficient adhesion between the tensile material and grout.
It becomes possible and the yield strength of the anchor is increased . <D> After injecting grout into the sheath tube,
Block the external inlet by increasing the internal pressure of the uto hose above a certain level
Open the occluder to grout the outer circumference of the sheath tube.
Can be entered . Therefore, once inside and outside the sheath tube
Inside the sheath tube while continuing the grout injection work
And it is possible to inject grout into the periphery . This
Therefore, the grout hose of the present invention is a grout injection
Easy to manage .

[Brief description of drawings]

FIG. 1 is an explanatory view of a state of being injected into the sheath tube.

FIG. 2 is an explanatory view of a state of being injected outside the sheath tube.

FIG. 3 is an explanatory diagram of a conventional technique.

Claims (1)

(57) [Scope of utility model registration request] 1. A grout pouring hoe used when an anchor is constructed by pouring grout into the inside and outside of the sheath pipe after mounting the sheath pipe around the tensile member and inserting the sheath pipe into the drilled hole. At the tip of the sheath, there is an external inlet for injecting grout outside the sheath tube, and an internal inlet for injecting grout into the sheath tube slightly above this external inlet. However, the external injection port is closed by a closing body which is opened when the internal injection of the grout is completed and the internal pressure of the sheath tube is increased above a certain level, and the grout injection hose for anchor construction is characterized by Su.