JP2765809B2 - Shoring construction method and equipment members used for it - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the excavation of a horizontal shaft such as a tunnel and the like, in which an insertion tube is formed in parallel with a pipe roof on the peripheral side surface of an excavating mirror for the purpose of lining the ground and stabilizing soft parts. Construction of a shoring system that will be used as a reinforcing core material for shoring to prevent collapse of the pit wall, and based on this, lath mesh stretching, waterproofing sheet stretching, support reinforcement, and interior concrete formwork construction TECHNICAL FIELD The present invention relates to a composite pipe for in-pipe injection and a hole packer to be used at the time of a casting method and an insertion pipe.

[0002] Also, the present invention relates to an insert tube holder which can be used in various fields, in addition to being used for focusing a branch pipe such as a composite pipe for in-pipe injection or an injection pipe for forming an injection bulb portion of an anchor.

[0003]

2. Description of the Related Art Conventionally, there has been a method of placing steel pipes in parallel as a reinforcing core material for a shoring work. However, insertion of an insertion pipe into a ground is performed in an angle direction which slightly expands in a digging direction. By overlapping and lapping a predetermined length of the rear end portion of the insertion tube with the front end portion of the insertion tube inserted in the previous process, the continuity of the reinforcing core material in the excavation direction is ensured, and the It has been used as a packing process space.

Further, when the injection material is pressure-fed into and out of the reinforcing core material through the insertion tube, it is necessary to prevent the air sealed in the insertion tube and the insertion hole from being stored in the ground or the like and being spouted by the injection pressure or the like. , An insertion tube such as an air bleeding tube for bleeding air enclosed in the insertion tube and the insertion hole, a squirt tube for pressure-feeding and ejecting the injection material, and a packer operation tube for sealing the inflation pressure into a packer sac provided in a predetermined position. Must be inserted.

[0005] The convergence of the insert tube may be performed by simply tightening the convergence portion with a gum tape or a band. However, when the convergence position is aligned and fixed, the air vent tube is inserted through the center shaft. A holder having the same length as the insert tube provided with a center shaft hole and several fitting grooves for fitting the insert tube to the outside has been used.

[0006] Further, the hole packer of the injection pipe insertion port is subjected to caulking with concrete, closed the rear end of the injection pipe with an injection cap, or wrapped around the tip of the injection pipe and expanded by pressure or liquid pressure. Many methods have been adopted to seal the sac body tightly to the hole wall, but these packers have been buried and killed without being recovered.

On the other hand, in the case of an anchor construction in which a ground hardening material is injected in the form of a bulb into the base end of an insertion pile, which is often used for solidification in general civil engineering construction, to solidify the foundation, the base of the pile is packed into the ground. Hardeners are injected, but these packers have also been buried without recovery.

[0008]

A conventional reinforcing core material is cast in such a manner that a front end portion of the insertion tube inserted in the previous step and a rear end portion of the newly inserted insertion tube are overlapped by a predetermined length. The insertion port of the insertion tube is 1
Must be taken in the lowered position.

[0009] Therefore, the waterproofing work following the casting of the core material, H
The support layer composed of steel reinforcement and concrete spraying creates a level difference every time the casting process is performed, and the pit wall becomes wavy. However, there is a problem that both sides generate large waste.

Further, when a focusing holder having the same length as the insert tube is used for focusing and inserting the insert tube such as the air vent tube, the injection material ejection tube, and the packer operating tube into the insertion tube, the insert into the center shaft hole is formed. In addition to the work of inserting the pipe and the work of fitting the insert tube into the fitting groove provided on the outside of the holder, a large amount of labor is required. In addition, the length of the insertion process is limited, and it is impossible to increase the length.

Furthermore, the inability to collect the packer closing the hole wall of the insertion port for the injection results in waste of the packer space, and the cost of the packer itself is such a waste that it cannot be justified once.

[0012]

Means for Solving the Problems The present invention addresses the above-mentioned problems and makes it possible to cut off a predetermined length of a rear end portion of an insertion tube inserted as a reinforcing core material of a shoring by crushing or the like. With this configuration, the overlapped lap portion is cut with a shovel or the like after insertion and casting into the ground, and the detachable portion of the insertion tube is cut off together with the insertion portion ground to equalize the level difference in the pit wall.

[0013] The insertion of the insertion pipe into the ground is carried out by loading a propulsion rod having a digging mechanism at the tip into the insertion pipe, inserting the propulsion rod into the target ground, and inserting the propulsion rod at a predetermined depth. The tube is separated and retracted from the tube and pulled out, and the injection tube, which is bundled by a partial holder having a fitting hole capable of expanding the air release tube, the injection material ejection tube, the packer operation tube, and the like by a cutout portion, is inserted into the insertion tube. It should be noted that this partial holder may of course use only an insertion hole that does not expand.

At the rear end of the injection tube for injecting the injection material into the insertion tube, holders provided on both sides of the installation tube to be mounted on the injection tube are provided with a cylinder made of an elastic material or elastic material surrounding the installation tube. A structure that expands and contracts a packer by inserting a body, and furthermore, a cylinder body that has an inflatable slack in the dough, fixing both ends to the holder, and injecting and discharging fluid into the gap between the wearing tube and the cylinder body. By mounting the hole packer provided in the holder portion, the hole packer can be collected after the injection of the injection material, and the space of the packer can be saved.

At a predetermined position, the injection tube insertion portion is packed by the above-mentioned packer mechanism and the injection material is pressure-fed to the insertion tube, so that the injection material is ejected from the insertion tube ejection hole into the surrounding soil, and the insertion tube is driven. At the end, the inflation fluid injected into the packer sac is removed, the attachment to the insertion tube is released, and the hole packer is recovered.

Further, when anchoring is performed by the packer using the insert pipe holder according to the present invention, the insert pipe holders are provided at both ends of the elastic sheet constituting the elastic cylinder above the anchor root forming position of the built-in pile. In which one of the holders is provided with an operation mechanism for inflating the packer's body, and an anchor root forming injection material is pumped from the insert tube mounted on the holder to form an anchor root on the foundation of the built pile. It is.

[0017]

When the focused injection pipe is inserted into the insertion pipe inserted into the ground by the propulsion rod, the fluid is injected into the hole packer mounted on the rear end of the injection pipe, and the hole wall of the injection pipe insertion port is removed. Will be packed.

Next, the packer sac set at the position closest to the insertion port is inflated with the injection material, and the injection material is introduced into the shift gap from the port packer to the first packer sac through the first insert ejection pipe. It is pressure-filled at about 7 kgf / cm ² .

The hole packer has a structure in which the hole is completely sealed. However, since the first packer bag 35 is a breathable cloth packer and is provided with a gap for releasing residual air to the second shift. The residual air pushed by the injection pressure escapes to the second shift, is filled with the injection material in the first shift, and is further penetrated into the surrounding ground through the ejection hole of the insertion pipe.

[0020] Similarly, injection is performed in the second shift and thereafter, and the residual air is discharged from the air vent pipe opened in the last shift to the insertion port.

The holder for bundling the focusing injection tube is formed by bundling a long insert tube, expanding the cut portion, fitting the holder from the side of the focusing tube, fitting the tube into the shaft hole, and partially fitting the tube. Since the binding is performed, there is no need to insert or insert a long insert tube along the long holder.

Further, in the conventional long holder, the fitting of the insert tube depends on the flexibility of the insert tube side.
Although the insert tube was crushed by the bending pressure of the holder and the like, the pressure-feed material was clogged, but the holder according to the present invention was made of a flexible material such as rubber whose hardness was adjusted on the holder side, and the cut portion was expanded. The insert tube to be bundled can be held by being held from the outside, and can be easily bound by tightening with a band or the like from the outside of the holder body.

The insert tube fitted into the shaft hole by tightening from the outside of the holder body is tightened by the cut portion of the shaft hole, and is firmly fixed in the holder.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an insertion tube provided with a plurality of ejection holes 11 on the tube wall, and the main body is formed of a steel tube or the like, but a predetermined length of a rear end portion is made of a brittle material such as PVC with glass fiber added to a shovel. It is configured as a separating portion 12 that can be crushed by, for example, crushing.

Reference numeral 2 denotes a propulsion rod, which is provided with a down-the-hole hammer 22 or a suitable excavation bit at the tip and a support mechanism for detachably supporting the insertion tube 1, and which is inserted by driving a drifter B of the propulsion device A. While the pipe 1 is supported, it is pierced and propelled to the ground G.

When the insertion of the insertion tube 1 into the ground G is completed,
The propulsion rod 2 is removed from the insertion tube 1 by the drifter B of the propulsion device A, and is pulled out, and the injection tube 3 is inserted into the insertion tube 1 again.

The injection pipe 3 includes an air bleeding pipe 31 for bleeding the air sealed in the insertion pipe 1 and the insertion hole at the time of injection, and a plurality of ejection pipes 32 opened to the process shift portion for pressure-feeding and jetting the injection material. A plurality of packer operating tubes 33 which are opened in the shift packer bag body 34 provided therein and are filled with inflation pressure are bundled by a holder 4 fitted and supported in a focused state at an appropriate position.

At the rear end of the injection tube 3, a hole packer 5 is mounted, and when the injection tube 3 is inserted into the insertion tube 1, the hole packer 5 packs the injection tube insertion portion E. At the same time, the packer working tube that opens into the shift packer bag 34 set at the position closest to the insertion port expands the shift bag 34 with the injection material, and accordingly, the hole packer 5 is passed through the first insert ejection tube. The injection material is pressure-filled at about 3 to 7 kgf / cm ² into the shift space from the shift packer to the shift packer body 34.

The hole packer 5 is made of an elastic material such as a stretchable cloth or a hardness-adjusted rubber which surrounds the mounting tube 51 in holders 52 provided on both sides of the mounting tube 51 mounted on the injection tube 3. Insert the cylindrical body 53 and attach both ends to the holder 52
The holder 53 is provided with a fluid inlet / outlet structure 54 that is fixed to the mounting tube 51 and opens into a gap 55 between the mounting tube 51 and the cylinder 53. When a fluid is injected into the gap 55, the cylinder 53 expands to form a hole wall. , So that the injection tube insertion portion E is sealed.

The hole packer 5 has a structure in which the injection tube insertion hole is completely sealed, but the shift packer sac 34 is a breathable cloth packer and is provided with a gap for allowing residual air to escape to the second shift. Therefore, the residual air pushed by the injection pressure escapes to the second shift, and the first shift is filled with the injection material, and is further injected into the surrounding ground through the ejection hole of the insertion pipe.

In the same manner, injection is performed on and after the second shift, and the residual air is removed by an air vent pipe opened at the last shift.
It is discharged from the insertion port to the outside of the insertion port, the entire inside of the insertion tube 1 is filled with the injection material, and further injected into the surrounding ground through the ejection hole of the insertion tube. When the injection is completed, the fluid in the gap 55 of the hole packer 5 is drained and the packer 5 is recovered.

When the insertion of the insertion pipe 1 has been completed in this way, the insertion pipe is further installed adjacent to the insertion pipe 1 by the same process, and is arranged in parallel as a reinforcing core material along the face of the horizontal shaft excavation.
Excavate the face.

At the stage of excavation near the tip of the parallel insertion pipe, the insertion port is set at a position one step lower than the parallel insertion pipe in the previous step, and the insertion pipe parallel driving is performed again in the same process to support. While digging in the horizontal shaft while securing
A step is generated by the previous casting step, and the ground of the insertion portion protruding from the pit wall is cut off and leveled together with the separable portion 12 of the insertion pipe 1.

A supporting layer is formed by flattening a lath mesh, spreading a waterproof sheet, reinforcing bars of H steel and spraying concrete on the leveled pit wall, and constructing a concrete formwork to finish the interior of the pit wall. Is what you do.

The insert tube holder 4 used for bundling the focusing and injection tube 3 is made of an elastic material capable of expanding the cut portion. A center shaft cutting portion 42 is provided along the radiation axis to the outside of the main body. In this embodiment, the holder 4 is made of synthetic rubber whose hardness has been adjusted, but is not limited to this.

A sub-shaft hole 43 penetrates around the center shaft hole 41, and a sub-shaft split portion for cutting from one side of the center shaft hole to the inside of the center shaft hole.
44 are provided.

When a tube is inserted into the holder, the center shaft split portion 42 of the holder is opened to the left and right, so that the sub shaft split portion 44 expands.

After the fitting of the tubes into all the sub shaft holes 43 is completed, the air vent tube 31 is inserted into the center shaft hole 41 to close the center shaft cutting portion 42, and tightened with a band or the like from outside the holder body.

[0039]

As described above, the present invention is constructed as described above, so that a step is generated every time the core material is put into place and the leveling of the corrugated wall is prevented from being wasted. In addition to this, the packer bag can be expanded and contracted by directly inserting the hole packer into the overlapped wrap portion, so that the packer can be used repeatedly by collecting the packer, which is extremely advantageous in terms of cost.

Also, if the convergence of the insert tubes constituting the injection tube is bound by an insert tube holder provided with a cut portion, the insert tubes can be securely aligned and fixed, and the insert tube can be opened at an arbitrary position. , Shift packers, etc., can be set freely.

Further, the insert tube holder of the present invention
Since the insert pipe is fitted into the shaft hole and tightened by the clearance of the cut, it is firmly fixed without breaking the outer shape of the pipe, so that the insert pipe is not crushed and the injection material is not clogged, and the insert pipe is not clogged. The bundling operation is greatly facilitated, the bundling points can be freely selected, and the utilization range is extremely wide.

[0042]

[Brief description of the drawings]

FIG. 1 is an overall side view showing a state of execution of insertion and casting in a target ground of an insertion pipe according to a conventional example.

FIG. 2 is an overall side view showing an installation state of an insertion pipe in a target ground in an embodiment of the present invention.

FIG. 3 is an overall front view of the horizontal shaft showing a state of inserting pipes inserted in parallel to the excavation mirror surface of the horizontal shaft.

FIG. 4 is an enlarged side view of the distal end portion of the insertion pipe showing a situation where the propulsion rod is loaded and the insertion pipe is propelled and inserted into a target ground.

FIG. 5 is a side view showing a situation in a target ground where an injection pipe is loaded into an insertion pipe and an insertion hole is packed by a hole packer.

FIG. 6 is a perspective view of the packer showing the structure of the hole packer according to the present invention.

FIG. 7 is an enlarged perspective view of a hole-side holder of the packer showing a structure of a hole packer according to another embodiment of the present invention;

FIG. 8 is a perspective view showing an embodiment of an insert tube holder according to the present invention.

FIG. 9 is a front view showing a state in which the cut portion of the insert tube holder is also expanded.

FIG. 10 is a perspective view of a main part of a tip showing a conventional insert tube holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insertion pipe 11 Injection hole 12 Disconnection part 2 Propulsion rod 22 Down-the-hole hammer 3 Focusing injection pipe 31 Air vent pipe 32 Injection material injection pipe 33 Shift packer operation pipe 34 Shift packer bag 4 Insert pipe holder 41 Center hole 42 Center cut part 43 Coaxial shaft hole 44 Coaxial shaft split part 5 Hole packer 51 Mounting pipe 52 Hole packer holder 53 Elastic cylinder 54 Fluid injection / discharge structure 55 Gap A Propulsion unit B Drifter C Horizontal shaft excavation D Injection material penetration E Injection Pipe insertion section G Ground mountain J Conventional insert pipe holder K Center shaft hole of conventional holder L Insert pipe fitting groove M Insert pipe

Continuation of the front page (56) References JP-A-8-121073 (JP, A) JP-A-6-108774 (JP, A) JP-A 38-1223 (JP, Y1) JP-A 62-5117 (JP) , Y2) Jikken 62-15359 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 9/04 E21D 20/00

Claims (4)

(57) [Claims] A propulsion rod provided with a digging mechanism at a tip is loaded into an insertion pipe having a plurality of ejection holes formed in a pipe wall and a predetermined length at a rear end thereof capable of being cut off. At the specified depth, the propulsion rod is separated from the insertion pipe, retracted, pulled out, and a plurality of injection material ejection pipes are inserted into the air release pipe.
Dressing compound infusion tube with shift packer to insert the insertion tube
And insert it into the
From the first shift to the second shift to the third shift
By injecting the injection material while sequentially sending
The remaining air in the insertion tube to the first shift.
Relieved to the second shift by the injection pressure and then sent sequentially
And release it from the air vent pipe that opens in the final shift.
By inserting the injection material into the insertion pipe by pressure and ejecting the injection material from the insertion pipe ejection hole into the surrounding soil, the inserted insertion pipe is juxtaposed as a reinforcing core material and inserted into the pit wall after completion of the installation paralleling Construction method of supporting works characterized by cutting and leveling the ground in the part 2. An air vent tube, which vents the air sealed in the insertion tube and the insertion hole during injection , is provided at a predetermined position as a core.
Packer working tube that seals the inflation pressure in the girder packer
Open at each shift constituted by inflation of the packer sac
Tube for injecting pipes, which is formed by attaching a plurality of injection material ejection pipes to be attached and binding them by a holder which is fitted and supported in a focused state at an appropriate position 3. An injection pipe is mounted on an air release pipe.
The inflatable tubular body surrounding the loading tube is inserted into holders provided on both sides of the partition section that separates the rear end of the loaded tube. A hole-packer in which the holder is provided with a structure that expands and contracts the packer by injecting and discharging fluid into the gap. 4. A center shaft cut portion which is made of an elastic material capable of expanding the cut portion, penetrates the center shaft hole through the shaft core portion, and extends from one side of the center shaft hole to the outside of the main body along the axis radial axis. An insert tube holder comprising a sub-shaft notch that penetrates the sub-shaft hole around the center shaft hole and cuts from one side of the center shaft hole to the inside of the center shaft hole.