JPH02118300A - Polishing method for underground pipe - Google Patents

Abstract

PURPOSE:To shorten the construction them and save civil engineering costs by forming cavities around a buried pipe using a discharged liquid from a fluid type excavating tool, and grinding the outer surface of the buried pipe with reciprocative motion of a grinding tool placed in the cavity. CONSTITUTION:Existing invention applies to a grinding method for an underground buried pipe P, whereby fluid is discharged into soil from the discharge hole at the tip of a fluid type excavating tool 6 inserted into the ground so as to soften the soil around the buried pipe P. Then the soil is exhausted by a suction removing tool 7, and a large dia. cavity 8 is formed around the buried pipe P. A grinding tool 18 coupled with a spherical file is inserted into this cavity 8 from an underground hole 2 and wound fast on the buried pipe P. Then operational members 19a, 19b of the grinding tool 18 led onto the ground are operated to reciprocate the grinding tool 18 in the circumferential direction of buried pipe P, and thus the outside surface of the buried pipe P is ground. This shortens the construction term greatly and suppresses the civil engineering costs to a great extent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a polishing method for inspecting and repairing underground pipes, such as those for city gas and water supply.

[Conventional technology]

Conventionally, for example, in order to create the space necessary for inspection and repair around an underground pipe (P), a hole (29) with a large diameter corresponding to the required space (X) was created, as shown in Figure 6. It is excavated from the ground surface, and the worker enters the hole (29) and installs the buried pipe (
P) was polished by appropriate means.

[Problem to be solved by the invention]

However, the amount of excavated soil associated with the formation of the hole (29) increases, requiring a large amount of time, labor, and expense for excavation work, treatment of excavated soil and backfilling soil, and backfilling work, and - there is room for layer improvement. was there.

The purpose of the present invention is to greatly reduce the amount of excavated soil so that the space necessary for polishing can be created underground, thereby shortening the construction period.
The purpose of this invention is to enable polishing of buried pipes while sufficiently reducing civil engineering costs.

[Failure to solve the problem]

The characteristic means of the present invention is to insert a fluid-type excavation tool into the ground from the ground surface, and to discharge fluid supplied from the ground into the soil from a discharge port provided on the tip side of the excavation tool. The tip of the excavation tool softens the soil around the buried pipe, and the softened soil is discharged using an underground hole to insert the excavation tool and discharge the soil. A large-diameter cavity is formed in the ground, a polishing tool introduced into the cavity through the underground hole is wound around the buried pipe, and an operating member of the polishing tool is brought out from the underground hole to the ground. Operate and
The polishing tool is reciprocated in the circumferential direction of the buried pipe, and the outer surface of the buried pipe is polished by the reciprocating polishing tool, and its functions and effects are as follows.

[For production]

In other words, a fluid is discharged from the tip of a drilling tool inserted into the ground, softens the soil in an area corresponding to the space required for polishing, and the softened soil is discharged through an underground hole and excavated. Forms a cavity with a larger diameter than the underground hole for inserting tools and draining soil. Then, using underground holes and cavities,
A polishing tool is wrapped around the buried pipe, and the outer surface of the buried pipe is polished while the polishing tool is reciprocated in the circumferential direction of the buried pipe by operation from the ground.

Therefore, in areas other than the space required for polishing, only one or a few underground holes are used for inserting digging tools, draining soil, and taking out and taking out polishing tools, and the diameter is extremely small, for example, on the order of several centimeters. The amount of excavated soil can be greatly reduced compared to the prior art described above.

In addition, it is possible to polish the outer surface of buried pipes in a sufficiently good manner, for example, to improve the adhesion of sealing material to buried pipes, or to remove deposits so that they can be inspected using a fiberscope or the like. .

By the way, polishing buried pipes by sandblasting or shotblasting requires large-scale equipment, so
This is disadvantageous in terms of construction, and there is a high risk of damaging old buried pipes due to excessive impact force, but according to the reciprocating polishing method of the present invention, construction can be easily performed using a simple jig. This reduces the risk of damage to buried pipes.

〔Effect of the invention〕

As a result, the construction period can be drastically shortened and the civil engineering costs can be greatly reduced. Especially in road construction, the construction period can be significantly shortened and traffic disturbances can be sufficiently alleviated. We have established a more convenient polishing method for underground pipes that can be carried out satisfactorily with almost no damage to the underground pipes.

〔Example〕

Next, examples will be shown.

(a) As shown in Figure 1 (a), after confirming the position of the buried pipe (P) using a known pipe locator, the soil is collapsed with a water jet ejected at high speed from the tip nozzle, and the soil is softened. A first underground hole (2) extending from the ground surface to the buried pipe (P) is formed by a vertical digging tool (1) configured to push up the underground pipe (P) to the ground surface, and the drilling tool (1) and another Check the depth of the buried pipe (P) using a scale, etc.

In addition, the drilling tool (
The water supplied to 1) has a pressure of 100 to 125 kg/cI.
! ! The amount of water is 5 to 101! /min,
The jet speed of the water jet is about 170 to 350 m/sec.

(B) As shown in Figure 1 (B), the underground hole (2
), the second underground hole (4) and the third underground hole (5) are installed on both sides of the buried pipe (P).
It is formed to an appropriate level below the buried pipe (P) based on the depth of the buried pipe (P).

(C) As shown in Fig. 1 (C), the horizontal digging tool (6), which is configured to collapse the soil with a water jet ejected sideways at high speed from the tip nozzle, is placed in the second and third ground. Insert into the medium hole (4), (5) and raise the buried pipe (P) to an appropriate upper level determined based on the depth of the buried pipe (P) from ) to a lower appropriate level (L2) for horizontal excavation. Gradually lower the excavating tool (6) and disintegrate the soil with a water jet.

The water jet is the same as the vertical digging tool (1).

(d) Underground holes (2), (4), (
It is discharged to the ground by the suction removal device (7) inserted from either of the underground holes (2) as shown in Figure 1 (d).
), (4), (5).
) is formed underground.

You can choose which underground hole (2), (4), or (5) to use to discharge the softened soil, and even if you discharge the softened soil at the same time as soil collapse, A soil evacuation step may be performed after the disintegration step.

(E) As shown in Figure 1 (E), the first underground hole (2)
Insert the partitioning jig (12) into the cavity (8). In the jig (12), an elastic body (12b) such as a sponge connected to the tip of the operating member (12a) is housed in a cylinder (12c) in a compressed and deformed state, and the operating member (12a) is accessed from the ground. ) while holding down the cylindrical body (12c), as shown in Fig. 1 (f), the elastic body (
12b) partitions the cavity (8) above the buried pipe (P).

(f) As shown in Figure 1 (g), the pressure receiving member (13
) is attached to the tip of the rigging (14) such as a wire, and pressurized gas such as air from the air supply device (15) is supplied to the underground hole (4 or 5) as shown in Figure 1 (ch. ), the pressure receiving member (13) is moved by pressurized gas to the buried pipe (P
) is sent to the ground through the third or second underground hole (5 or 4), and the rigging (14) is wound around the buried pipe (P).

(G) As shown in Figure 1 (S), the partitioning jig (12)
After collecting the cord, a pull-out jig (16) for the rigging (14) is inserted into the first underground hole (2). The jig (16
), a string-like body (16c) such as a wire with a hook (16a) and a stopper (16b) attached to the tip
is passed through a number of short tubes (16d), and then passed through a guide tube (16d).
Push the hook (16a) into the − side of the buried pipe (P) from e).

(H) As shown in Figure 1 (J), by pulling the string-like body (16c) while supporting the short tube (16d) by operating from the ground, the short tube (16d) at the tip is connected to the stopper (16b).
The string-like body (16c) and the short tube (16d) work together to give the pull-out jig (16) the rigidity that allows the position adjustment of the hook (16a) to be carried out from the ground, and The hook (16a) is hooked onto the rigging (14) while visually observing with the fiberscope (17) inserted into the cavity (8).

(S) As shown in Figure 100, the hook (16a)
is pulled out from the first underground hole (2), and one end of the rigging (14) is pulled out from the first underground hole (2), and then the guide tube (
Hook (16a) from 16e) to the other side of the buried pipe (P)
Push in.

(J) The hook (16
a) on the rigging (14), pull out the other end of the rigging (14) from the first underground hole (2), and as shown in Figure 1 (1), insert a large number of spherical files and One side (19a) of an operating rigging connected to both ends of a polishing tool (18) formed by connecting a wire brush or the like is connected to the rigging (14).

(L) As shown in Figure 1 (W), pull the rigging (14), pull the polishing tool (18) into the cavity (8) and wrap it around the buried pipe (P), and use one for operation. Pull out the rigging (19a) to the ground.

(1) Both operating ropes (19a) and (19b) are pulled alternately from the ground, and the polishing tool (18) is reciprocated in the circumferential direction of the buried pipe CP), and the reciprocating polishing tool (18) Polish the outer surface of the buried pipe (P). After confirming that the polishing process has been sufficiently performed using the fiberscope (17), the polishing tool (18), the operating cordage (19a),
(19b), guide tube (16e), and fiberscope (17) are collected.

(W) As shown in Figure 1 (force), use the sealant injection tool (9
) into any of the underground holes (2), (4), and (5), fill the cavity (8) with the sealing material (10), and check it to the specified level using the filling level detector (11). Seal material (1
After detecting that 0) has been filled, the supply of sealing material is stopped, and the buried pipe (P) whose outer surface has been polished is covered with the solidified sealing material (10) to perform processes such as leakage repair and pipe reinforcement.

After stopping the sealant supply, collect the sealant injection tool (9) and filling level detector (11), and backfill the first to third underground holes (2), (4), and (5). .

Further, the sealing material (lO) is appropriately selected from various known resin materials such as urethane-based and epoxy-based materials, and known inorganic materials such as water glass.

A plurality of components that react with each other and solidify may be injected into the cavity (8) individually or in a premixed manner.

[Another example]

Next, another embodiment will be described.

The specific configuration of the vertical digging tool (1) can be changed as appropriate, and for example, a device that spouts a gas-liquid mixture such as water and air, a device that spouts a gas such as air, a drill-type device, etc. can be used.

The horizontal digging tool (6) is a gas-liquid mixture such as water and air,
Alternatively, it may be configured to eject a gas such as air at high speed and collapse the soil with the impact energy of the jet stream, or it may be configured to eject a liquid or a gas-liquid mixture at a low speed and cause the soil to penetrate through the liquid. It may be configured to soften the fluid, and the direction of the fluid discharge port is not critical.
These are collectively referred to as a fluid drilling tool (6).

If the depth of the buried pipe (P) is known in advance, the first
The underground hole (2) in the figure can be omitted.

The underground holes (4) and (5) into which the fluid-type excavator (6) is inserted may be omitted, and the fluid-type excavator 6) may be inserted by pushing or driving into the soil.

The fluid drilling tool (6) may be inserted in one or three or more locations.

The underground hole for draining the soil may be one into which the fluid drilling tool (6) is inserted or one after it has been pulled out.

The specific configuration of the removing device (7) for discharging the soil can be changed as appropriate, and for example, a device having a function of blowing air to lift soil by an air lift action, a screw conveyor type device, etc. can be used.

Alternatively, the soil may be discharged by fluid from the fluid excavator (6) and the removal tool (7) may be omitted.

The specific means for wrapping the polishing tool (18) around the buried pipe (P) can be changed as appropriate, and for example, the means described in items (a) to C) below can be used.

(a) As shown in Fig. 2 (a), a wiring device (21) for rotating and winding up or winding the coil spring-like rigging (20) is installed on the ground, and 3 underground hole (4), (5) guide (22), (2
3), and the coil spring-like rigging (20) pushed through one of the underground holes (4) while rotating is moved above the buried pipe (P) by the action of the first guide (22). After guiding it, the second guide (23) and the earthen wall guide it downward into the buried pipe (P), and then, as shown in Figure 2 (b), the first guide (22) acts to guide it downward. After guiding it above the buried pipe (P), it is guided to the other underground hole (5) by the action of the second guide (23) and the earthen wall, and placed above the ground while being wound around the buried pipe (P). Derive.

Thereafter, as in the previous embodiment, the polishing tool (18) is pulled into the cavity (8) by the coil spring-like rigging (20) and wrapped around the buried pipe (P).

(b) As shown in FIG. 3(a), the tip (24a) of the spring (24), such as a leaf spring, is formed into a curved shape that can be wrapped around the buried pipe (P), and As shown in Figure (b), the guide tube (25) inserted into the first underground hole (2)
), the spring (24) is pushed in with the tip II (24a) in an elongated and deformed state, and as it is pushed in, the tip (25a) of the spring (24) is buried with elastic restoring force. While being pressed against the pipe (P), move it in the circumferential direction of the buried pipe (P) and wrap it around the buried pipe (P).

After that, as shown in FIG. 3(d), the guide tube (25
), hook the hook (26a) of the jig (26) onto the tip of the spring (24), and pull out the tip of the spring (24) with the drawer jig (26). .

After that, similarly to the previous embodiment, the polishing tool (18) is bowed into the cavity (8) by the spring (24), and the buried pipe (
P).

(C) The tip part (27
a) is attached to the push-in large rigging (27) made of wire, etc., and as shown in Figure 4 (ri), the first underground hole (2) is installed.
Push the tip (27a) of the large rigging (27) into the cavity (8) from the guide tube (28) inserted into the cavity (8), and push the tip (27a) of the large rigging (27) in an extended state to energize the electric heater attached to the tip (27a) and to 8) Separate the tip (
27a), and as shown in FIG. 4(b), the distal end portion (27a) is heated to transform into a memorized shape and then wrapped around the buried pipe (P).

After that, in the same manner as in the above (b), the drawer jig (2
6), pull out the tip (27a) above the ground and remove the polishing tool (18).
) into the cavity (8) with the rigging (27), and the buried pipe (P
).

In addition, in the above (a) or C), any underground hole (2), (4), or (5) is used to install the rigging (20
).

(27), spring (24), and polishing tool (18) can be moved in and out of the cavity (8) as appropriate.

In addition, rigging (20), (27)' and springs (24)
), the underground holes (2), (4), and (5) may be moderately inclined in an appropriate direction as shown in Figure 5 to facilitate winding of the underground pipe (P). good.

To operate the polishing tool (18), the rigging (14), (20), (27) or spring (24) may be used instead of the operating rigging (19a), and these can be used as the operating member ( 1
9a and 19b).

How to treat the buried pipe (P) after polishing can be selected appropriately, such as leak inspection using a fiberscope, repair of the leak using a sealant applicator or spray tool, and treatment of the cavity (8)' after the leak inspection. This includes increasing support strength by pouring concrete.

Note that although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structures and methods shown in the accompanying drawings.

[Brief explanation of drawings]

FIG. 1(A) is a conceptual diagram of the construction procedure in an embodiment of the present invention. Figure 2 (a), (a), Figure 3 (sunishuku 2), Figure 4 (a), (b), and Figure 5.
The figures are explanatory diagrams of different embodiments of the present invention. FIG. 6 is a conceptual diagram of a conventional example. (2), (3), (4)... underground hole, (6
)...Fluid drilling tool, (8)...Cavity part, (13)...Pressure receiving member, (14)...
...Rogging gear, (18) ... Polishing tool, (19a and 19b) ... Operation member, (20) ...
・Coil spring-like rigging, (24)...Spring, (24a)...Spring tip, (26)...Drawer jig, (27) ...
...Push-type rigging, (27a)...Tip of push-in rigging, (P)...Buried pipe.

Claims (1)

[Claims] 1. A fluid excavator (6) is inserted into the ground from the ground surface, and fluid supplied from the ground is discharged into the soil from a discharge port provided at the tip of the excavator (6). Then, the discharged fluid softens the soil around the buried pipe (P) at the tip side of the excavation tool (6), and the softened soil is discharged using an underground hole to complete the excavation. A cavity (with a diameter larger than that of the underground holes (2), (4), and (5) for inserting the tool (6) and discharging soil)
8) is formed underground, and the hollow part (8) is formed from the underground holes (2), (4), and (5).
), the polishing tool (18) is wrapped around the buried pipe (P), and the operating member ( 19a and 19b) to reciprocate the polishing tool (18) in the circumferential direction of the buried pipe (P), and polish the outer surface of the buried pipe (P) with the reciprocating polishing tool (18). Polishing method for underground pipes to be treated. 2. To wrap the polishing tool (18) around the buried pipe (P), insert the pressure receiving member (13) attached to the rigging (14) through the underground hole (4), ) is supplied with pressurized gas, and the pressure receiving member (13) is moved by the pressurized gas and passed through the underside of the buried pipe (P), and then the underground hole (5) is moved.
2. The polishing tool (18) is then pulled into the cavity (8) by the rigging (14).
The described polishing method for underground pipes. 3. To wrap the polishing tool (18) around the buried pipe (P), push the coil spring-shaped rigging (20) through the underground hole (4) while rotating it, and out of the ground through the underground hole (5) through the lower side of the
The method for polishing an underground pipe according to claim 1, wherein the polishing tool (18) is then pulled into the cavity (8) by the rigging (20). 4. To wrap the polishing tool (18) around the buried pipe (P), insert a spring (24) having a tip (24a) formed in a curved shape that can be wound around the buried pipe (P). The tip portion (24a) is pushed through the underground hole (2) in an elongated and deformed state, and as the tip portion (24a) is pushed in, the tip portion (24a) is pressed against the buried pipe (P) by elastic restoring force. The extraction jig (26
) to pull out the tip (24a) above the ground, and then,
The method for polishing underground pipes according to claim 1, wherein the polishing tool (18) is pulled into the cavity (8) by the spring (24). 5. To wrap the polishing tool (18) around the buried pipe (P), push in the tip (27a) made of a shape memory material having a curved memory shape that can be wrapped around the buried pipe (P). The push-in type rigging (27) is equipped with the push-in rigging (27).
27) into the hollow part (8) from the underground hole (2) with the tip part (27a) in an extended state, and
7a) is heated to transform it into a memorized shape to form the buried pipe (
P) and pull out the tip (27a) above the ground using a drawer jig (26) inserted from the underground hole (2),
The method for polishing an underground pipe according to claim 1, wherein the polishing tool (18) is then pulled into the cavity (8) by the rigging (27).