JPH01230895A - Backfilling injection method in propulsive construction - Google Patents

Abstract

PURPOSE:To contrive the increase of a propulsive distance and the miniaturization of a propelling equipment smoothly propelling a pipe body with less resistance by injecting a hardening material into a clearance, generated by a difference between a shield machine and an outside diameter of the buried pipe body, thereafter a skid into between the hardening material and the pipe body. CONSTITUTION:A shield machine 5 is propelled with a pipe body 9, and a ring- shaped impermeable film member 6 is delivered from an impermeable film member storage part 7 of the shield machine 5 coating the pipe body 9, simultaneously a hardening material 18 is injected into a clearance between the film member 6 and the pipe body 9 from an injecting port 16 of a pipe body 9a through an injection hole 16a. Next a skid 19 is forced to be press injected uniformly between the hardened hardening material 18 and the peripheral surface of the buried pipe body 9 from an injection pipe 30 through injection and extraction ports of a connection pipe 41. By pressing the film member 6 to the ground 1, its collapse is prevented, while by a fluid film of the skid 9, the pipe body is smoothly propelled.

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention applies backfill injection into the gap between the excavated ground and the outer circumferential surface of the pipe when burying a pipe such as a sewer pipe underground using the propulsion method. It's about how to do it.

[Prior art] In a construction method in which the ground is excavated by a shield machine, a buried pipe such as a humid pipe is connected to the rear end of the shield machine, and the buried pipe and shield machine are propelled by jacks from the starting shaft side, the buried pipe This method involves injecting backfilling material into the gap between the excavated ground and the excavated ground.
This allows for miniaturization.

As shown in Figure 4, this backfilling material is poured into the gap (C) created by the difference between the diameter of the shielding machine (a) and the diameter of the buried pipe (b) following the shielding machine (a). It is injected using the injection port (d) drilled at the tip of the first buried pipe (b). At this time, a shaft opening gasket (f) is provided at the shaft entrance of the starting shaft (e) to prevent lubricant from leaking into the shaft.

Also, a cylindrical non-water permeable membrane material (g) is paid out from a shielding machine (a) to cover a buried pipe (b).

[Problem to be solved by the invention]

However, in the former case, the injected slipping material may permeate into the ground, or groundwater may enter from the joints of the buried pipes (b) and (t)).

On the other hand, in the latter case, if a backing material is injected as a lubricant into the gap between the membrane material (g) and the buried pipe (b), the buried pipe (b)
buoyancy is generated and floats up, and the outer peripheral surface of the buried pipe (b) comes into contact with the membrane material (button), and as the buried pipe (b) moves forward, the membrane material (sakaki) may be rubbed and damaged; , buried pipe, etc.) in a curved shape, the buried pipe (b)
There was a problem that the membrane material (powder) was damaged due to contact between the powder and the membrane material (g).

The present invention provides a method for backfilling in the propulsion method with the aim of solving these problems.

[Means to solve the problem]

In order to achieve the above object, the backfill injection method in the propulsion method of the present invention is a propulsion method in which the ground is excavated by a shield machine and a buried pipe is press-fitted. This method is characterized by injecting a curable material into the gap created by the method, and then injecting a lubricant between the injected curable material and the buried pipe.

In addition, in this construction method, when press-fitting a buried pipe while covering the buried pipe following the shielding machine with a water-impermeable cylindrical membrane material fed out from the shielding machine, the connection between the shielding machine and the buried pipe A curable material is injected into the water-impermeable membrane material that is fed into the gap created by the difference in outer diameter, and then a lubricant is injected between the injected curable material and the buried pipe body. It is something to do.

[For production]

According to the above construction method, after the curable material is injected, a lubricant is injected between the curable material and the buried pipe body, so that the propulsion resistance of the buried pipe body is reduced and the pipe body is smoothly propelled. This makes it possible to extend the propulsion distance and reduce the size and size of the propulsion equipment.

Furthermore, the water-impermeable cylindrical membrane material that is fed out as the shield machine propels the shield machine can prevent groundwater from entering the buried pipe body following the shield machine, and the distance between this water-impermeable membrane material and the outer peripheral surface of the buried pipe body. Since a hardening material is injected into the pipe, the outer peripheral surface of the buried pipe is prevented from coming into direct sliding contact with the water-permeable membrane material, regardless of whether the buried pipe is moved straight or bent. The buried pipe can be propelled without damaging it.

[Embodiment] To explain the embodiment of the present invention with reference to the drawings, (1) is the ground, (2) is the starting shaft excavated and formed in the appropriate place in the ground (1), and (3) is the wall of the shaft, The starting wellhead (4) was opened.

(5) is a shield machine, and the rear part of the skin plate is equipped with a storage part (7) in which a long cylindrical impermeable membrane material (6) made of a vinyl sheet or the like is contracted in the length direction and stored therein. The rear end of the storage portion (7) is opened rearward and formed at the outlet of the water-impermeable membrane material (6).

(8) is the excavation part of the shield machine (5). (9) is a buried pipe following the shield machine (5), many of which are connected one after another, and the rearmost pipe (9) is pushed by a pushing device 00) consisting of a propulsion jack installed in the shaft (2). It is something that can be done.

01) is a ring member that is fixed to the shaft wall (3) in line with the shaft entrance (4), and the rear end of the impermeable membrane material (6) and the annular packing 02) are connected to the shaft wall (3) and this ring member. (1
1), and an annular packing θ3) is watertightly fixed to the inside of the shaft of the ring member (11), and an annular packing θ2) 0
3) Attach the injection pipe side for injecting the lubricant into the gap.

This is a valve installed at an appropriate location on the side of the pipe.

06) is a curable material injection pipe connected to an injection hole (16a) communicating from the inner peripheral surface of the front end of the buried pipe body (9) to the outer peripheral surface, and pulp q'7) is provided at the appropriate position. ,
A curable material is injected between the water-impermeable membrane material (6) and the outer peripheral surface of the buried pipe (9).

(40) is applied thinly (approximately 5 mm) to the outer circumferential surface of the buried pipe (9a) at the forefront end with Molcle, etc.
This is a coating layer with a slightly larger diameter.

(41) is a short pipe connecting the buried pipe (9a) and the buried pipe (9b) that follows it, and as shown in Fig. 3, the shape is approximately equal to the end face of the buried pipe (9a) (9b). The annular plates H[Df2Φ are arranged in parallel, and both plates QΦ12[D
Partition ring plates (21) and (22) are fixed and arranged between the inner circumferential ends of the opposing faces and between the central part, and furthermore, the opposing ends of the buried pipe bodies (9a) and (9b) are provided at the outer circumferential ends. It is formed by integrally fixing an outer ring plate (23) having a ring-shaped flange that fits into a recess formed on the outer periphery,
Between the partition ring plates (21) and (22) and between the outer partition ring plate (22) and the outer ring plate (
23) Ring-shaped spaces (24) and (25) are formed between them, respectively.

Further, the partition plates (21) and (22) are provided with a lubricant injection port (26) and a port (27), respectively. Further, the outer ring plate is provided with spouts (28) at regular intervals or continuously in the circumferential direction.

(29) is a check valve for preventing backflow of lubricant disposed in the space (25) between the outlet (27) and the spout (28), and is bored in the inner partition plate (21). This prevents the slipping material 09) that is press-fitted from the injection port (26) from flowing backward.

(30) is a lubricant injection pipe connected to the injection port (26). (31) is a valve provided at an appropriate position on the injection pipe (30).

In addition, the cylindrical water-impermeable membrane material (6) and the shielding machine (5)
The outer diameter of the shield machine (
The excavated hole excavated in step 5) has a larger diameter than the outer diameter of the buried pipe body (9).

Now, while excavating the ground with the excavation part (8) of the shield machine (5), the pipe (
9) and press the rear end of the pipe body (9) together with the shield machine (5).
), the shield machine (5) follows its propulsion.
The impermeable membrane material (6) is paid out from the impermeable membrane material storage part (7) and covers the pipe body (9), but at this time, the injection pipe ( The curable material 08) is poured into the water-impermeable membrane material (16) through the injection port (16a).
6) and the tube body (9). At this time, the annular packing provided at the shaft entrance (4) is in pressure contact with the outer circumferential surface of the tube body (9), so that the curable material θ mark does not leak into the shaft.

The hardenable material 08) may be a mortar made by kneading cement and sand, a material made by adding bentonite to this mortar, or a mixture of water glass and sand. Any material that hardens after a certain period of time may be used. Incidentally, it is preferable to mix bentonite into the mortar so that the mortar can easily flow through the pipe or hose during injection.

The curable material θ8) is injected by installing a mixer (not shown) in the shaft (2) and supplying it to the injection pipe 00 by driving a pump.

In this way, the space between the water-impermeable membrane material (6) and the pipe body (9) is filled with the curable material θ under pressure, and the water-impermeable film material (6) is slid onto the pipe body (9). Press the outer circumferential surface of the impermeable membrane material (6) against the excavated ground by pressing the outer peripheral surface of the impermeable membrane material (6) so that it does not come in contact with the excavated ground by making the pressing force of the hardening material (0ff) filled in the space greater than the sum of the groundwater pressure and the soil. to prevent the collapse of the ground (1).

This curable material O is cured while the shielding machine (5) advances and the tube body connection pipe (41) moves to the position of the curable material 08) injected from the injection port (16a), Next, from the injection pipe (30) to the injection port (
26) A lubricant θ9) is press-fitted between the hardened curable material q0 and the outer peripheral surface of the buried pipe (9) through the spout (28).

At this time, the spout (28) is opened at regular intervals or continuously in the circumferential direction on the outer ring plate (23) of the connecting pipe (41), so the lubricant 09) is placed in the outer ring plate (23) of the connecting pipe (41). It can be evenly injected onto the outer surface. In addition, since the outer circumferential surface of the buried pipe (9a) in the foremost example is formed with an enlarged diameter part (40) by applying mortar, etc., when this enlarged diameter part (40) moves forward, the buried pipe body behind it An annular gap (space) between the outer peripheral surface of (9b) and the inner peripheral surface of the hardened layer of the curable material.
is generated, and the lubricant 09) can be easily injected and filled into the gap.

The lubricating material 09) is a highly viscous aqueous solution mainly composed of oil or fat, bentonite, or a highly absorbent polymer (for example, an acrylic acid/vinyl alcohol copolymer) that becomes a spherical elastic body when absorbed with water. Added spherical elastic bodies are used.

In this way, when the slipping material 09) is injected into the inner peripheral surface side of the hardened layer of the hardenable material 08) that has already been injected into the water-impermeable membrane material (6), the buried pipe (9) and the hardenable material Between 00 and lubricant 09
) is formed, and the buried pipe (9) is formed by the liquid film.
will be promoted smoothly.

In the above example, the lubricant 09) was injected after the curable material 08) had hardened, but even before curing, if the curable material 09) and the lubricant 08) were not mixed, the injection would not be possible. In addition, the buried pipe body (9a) is provided with an enlarged diameter part (40) coated with mortar or the like to form a lubricant injection space, but it is not possible to form such a space. Instead, the lubricating material 09) may be pressurized and the curable material 08) may be press-fitted while being spread outward by the pressure.

Further, a front annular packing 02) is fixed to the ring member 0υ integrally with the rear end of the water-impermeable membrane material (6), and the inner peripheral end of the annular packing 02) is fixed to the pipe body (9). ), this front annular packing 02) prevents the curable material 08) from leaking into the shaft, and the annular packing attached to the ring member 00 in the above embodiment is connected to the rear annular packing 02). As, both Patsukin 02) 03
) between the injection pipe side and the lubricant tank (32).
When the lubricant 9) is allowed to flow in, the lubricant 09) can be thinly applied to the outer peripheral surface of the tube (9) through the front annular packing 02) as the tube (9) is propelled.

Other technical configurations and tube embedding methods are the same as in the previous embodiment.

In this way, while injecting the curable material θ0 into the water-impermeable membrane material (6) that is fed out by the advancement of the shielding machine (5) and injecting the lubricant side after injecting the curable material 08), the shielding machine (5) and the starting shaft (2).
) side, add the pipe bodies (9) one by one, and move the starting shaft (2).
) and a reaching shaft (not shown).

In addition, in the above embodiment, the case where the impermeable membrane material (6) is interposed between the buried pipe body and the ground is described;
Of course, the present invention can also be applied to cases where the water-impermeable membrane material (6) is not interposed.

[Effects of the Invention] As described above, according to the backfill injection method in the propulsion method of the present invention, in the propulsion method in which the ground is excavated by a shield machine and a buried pipe body is press-fitted, the outer side of the shield machine and the buried pipe body is A curable material is injected into the gap created by the difference in diameter, and then a lubricant is injected between the injected curable material and the buried pipe, so the propulsion resistance of the buried pipe is reduced. The tube body can be smoothly propelled by
It is possible to increase the propulsion distance, reduce the size of the propulsion equipment, and make it more compact.

Also, a water-impermeable cylindrical membrane material is fed out from the shield machine into the gap created by the difference in outer diameter between the shield machine and the buried pipe, a curable material is injected into the water-impermeable membrane material, and then a curable material is injected into the water-impermeable membrane material. By injecting a lubricant between the injected curable material and the buried pipe, the water-impermeable cylindrical membrane material that is fed out as the shield machine propels the pipe into the buried pipe following the shield machine. In addition to preventing the intrusion of groundwater, a hardening material is injected between the impermeable membrane material and the outer peripheral surface of the buried pipe, so the impermeable membrane material is pressed against the excavated ground through the hardening material. This can prevent the ground from collapsing, and
This curable material allows the outer peripheral surface of the buried pipe to directly contact the water-permeable membrane material, whether the buried pipe moves straight or during bending construction.
This allows the buried pipe to be moved forward without damaging the membrane material since sliding contact is prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a simplified vertical sectional side view showing the construction state, FIG. 2 is an enlarged sectional view of the mine entrance, FIG. 3 is an enlarged sectional view of the injection hole, and FIG. 4 is a simplified vertical cross-sectional view showing a conventional construction method. (1)...Ground, (2)...Starting shaft, (5)...
・Shield machine, (6)...Cylindrical impermeable membrane material, (9)
...Buried pipe body, (14)0ω...Injection pipe, 08
)...Curable material, 09)...Sliding material. Figure 3 Figure 4

Claims (2)

[Claims] (1) In a propulsion method in which a shield machine excavates the ground and press-fits a buried pipe, a hardening material is injected into the gap created by the difference in outer diameter between the shield machine and the buried pipe, and then the injected material is A backfill injection method in the propulsion method, which is characterized by injecting a lubricant between the hardenable material and the buried pipe body. (2) In a shield propulsion method in which the ground is excavated by a shield machine and the buried pipe body is press-fitted while being covered by an impermeable cylindrical membrane material fed out from the shield machine, the buried pipe body is covered by the shield machine. A curable material is injected into the impermeable membrane material that is fed into the gap created by the difference in outer diameter between the machine and the buried pipe, and then a slipping material is placed between the injected curable material and the buried pipe. A backfill injection method in a propulsion method characterized by injecting.