JPH04106293A - Underground connection method of shield tunnel - Google Patents

Abstract

PURPOSE:To reduce a construction period by inserting a flexible freezing pipe from the inside of a first shield machine into an excavated hole in a bedrock to construct a freezing earth wall, making penetration of a second shield machine into the freezing earth wall, and executing a primary lining after making cut-off in the rear. CONSTITUTION:When a bedrock is in a good stabilized state, double packer for an excavated hole pipe and a freezing pipe is provided to a shield steel plate of a first shield machine 1. After that, for example, boring is made by means of a small caliber muddy water driving pipe method, the driving pipe is drawn out while making the substitution of muddy water, and flexible freezing pipes 4 are buried to construct a tulip-like freezing earth wall F. Then, after penetration of a second shield machine 1a into the freezing earth wall F, segment freezing plates 7 are assembled to a segment of the shield machine 1a to refreeze Fa. In addition, after cutters of the shield machines 1 and 1a or bulk chambers b are dismantled, a primary lining is executed with a steel segment.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a joining method for forming and joining a shield tunnel while digging underground with two sealers facing each other.

[Conventional technology]

Recently, underground development has been actively carried out, and the construction of underground tunnels is increasing. Since the construction of underground tunnels is mainly carried out using shield machines, a wide variety of shield machines have been developed, and tunnel construction using shield machines with variable excavation cross sections, multifaceted shield machines, etc. is also increasing.

Therefore, when constructing the tunnel, two shield machines are launched facing each other, form a shield tunnel while digging, and finally the shield tunnels formed by both machines are connected underground. However, one method for this purpose is the frozen underground bonding method. This construction method is safe and reliable, and can connect shield tunnels well, but it has the disadvantage that it usually requires a long construction period of 4 to 5 months.

In other words, in the conventional frozen underground joining method, two shield machines are launched facing each other and form a shield tunnel while digging.If the machines arrive at the joining point at the same time, As shown, shield machine 51.5
After embedding frozen pipes 52 in a conical shape from + and a to create an abacus-shaped frozen soil wall 53, a shield machine 51. ．．
Dismantle and remove the cutter 〇, bulk chamber, etc. of 51a, and -
The method used is to construct a lining and then join the shield tunnel, but this method requires - Preparation of freeze control facilities etc. inside the shell, 2 months for temporary construction, and 1 to 1 month during the freezing period. 5 Rikizuki,
Dismantling.

It took 1 to 1.5 months to lay the lining, and the total construction period was 4 to 5 months.

Therefore, in order to shorten this construction period as much as possible.

By staggering the arrival times of the two shield machines at the joining point,
As shown in FIG. 11, a method is also adopted in which a straight conical freezing tube 52 is buried from the shield machine 51 that arrived first, and a conical frozen wall 53a is created to wait for the shield machine that arrives later. However, in this method, since the freezing pipe is a straight pipe, the gap between the conical frozen soil wall 53a and the subsequent shielding machine 51a becomes large, so an auxiliary freezing pipe 52a is buried from the succeeding shielding machine 51a. It is necessary to create frozen soil 53b in the gap or to freeze the gap with the freezing tube 52 over time, and in the end, the shortening of the construction period and the effect of the first arrival of the shielding machine 51 cannot be fully utilized, and the former Compared to the above method, the construction period can only be reduced by about one month.

[Problem to be solved by the invention]

In order to compensate for the shortcomings of the conventional technology as described above, a. Attach equipment to the shield machine so as to shorten the process of freezing control equipment, etc. b. Innovate the face plate of the shield machine to make it compatible with the shield machine. Countermeasures are being considered, such as narrowing the joint section of the shield machine as much as possible and reducing the thickness of the frozen soil wall. Although these measures seem reasonable at first glance, in reality they complicate the structure of the shield machine, increasing the risk of breakdowns and accidents, and they also force the sacrifice of excavation, which is the main purpose of the shield method. As a result, satisfactory results may not be obtained.

Therefore, the problem to be solved by the present invention is to provide a method for connecting shield tunnels in frozen underground that can shorten the construction period without changing the structure of the shield machine, and can accommodate the shapes and functions of all types of shield machines. An object of the present invention is to provide a joining method.

[Means to solve the problem]

The present invention has been made with the aim of solving the above problems, and the first aspect of the invention is a shield tunnel in which two shield machines face each other, dig underground to form a shield tunnel, and join together. In the joining method, the arrival time of the shield machine at the point to be joined is staggered, and a hole is drilled into the ground in an arcuate or curved shape using steerable boring from inside the shield machine that arrived first, and a flexible A freezing pipe is inserted to create a horizontal tulip-shaped frozen soil wall in time for the arrival of the later-arriving shield machine, and after penetrating the later-arriving shield machine into the frozen soil wall, After assembling segment freezing plates or installing affixed freezing pipes to stop the water at the rear, dismantle the shield machine's cutter, bulk chamber, etc., and apply JJ-method lining with steel segments, etc. The second invention is characterized in that a shield tunnel is joined, and the configuration of the second invention is a method for joining a shield tunnel, in which two shield machines face each other and dig underground to form and join a shield tunnel. , the timing of the arrival of the shield machine at the point to be welded is staggered, and a mechanism that can expand the width of a drilling chamber for horizontal freezing control equipment is installed in the segment immediately after the shield machine that arrived first, so that the later-arriving shield machine During the period up to reaching the point, a horizontal freezing pipe is buried from the widened hole drilling chamber up to the tail of the shield machine that will be installed later, creating a cylindrical frozen wall that is slightly larger than the diameter of the shield machine. After the later-arriving shield machine arrives within the frozen soil wall, water is stopped at the rear by assembling a segment freezing plate or installing freezing equipment behind the later-arriving shield machine, and then the shield is removed. This method is characterized by dismantling the canter bulk chamber of the machine, constructing a primary lining using steel segments, etc., and joining the shield tunnel.

That is, the joining method of the first invention staggers the timing of the arrival of the shield tunnels of the two shield machines at the point where they are to be joined.
A tulip-shaped frozen wall is created from inside the first-arriving shield machine using a freezing method on the tip side so that the second-arriving shield machine can enter, and the second-arriving shield machine penetrates into the frozen soil wall. In order to create the insufficient frozen soil from inside the later-attached shield machine, assemble a segment freezing plate or install a pasted freezing pipe to freeze the rear part and stop water, and then install the steel segment using the usual method. On the other hand, the joining method of the second invention is similar to the first invention, and the joining method of the second invention is based on the timing of the arrival of the two shield machines. A hole drilling chamber for burying a horizontal freezing pipe was constructed in the segment immediately after the first-arriving shield machine, and a cylindrical frozen wall was constructed by burying the horizontal freezing pipe from the drilling room forward. The purpose is to shorten the joining period of the shield tunnel by constructing the frozen soil wall, penetrating the later-attached shield machine into the frozen soil wall, and joining the shield tunnel in the same manner as in the first invention.

〔Example〕

Next, an embodiment of the bonding method of the present invention will be explained step by step with reference to the drawings.

Figures 1 and 2 are diagrams showing the state in which frozen pipes are buried; Figure 1 is an explanatory diagram when the ground is in a stable state;
The figure is an explanatory diagram when the stability of the ground is poor, Figure 3 is a cross-sectional view of the state where tulip-shaped frozen soil has been created, and Figure 4 is a cross-section of the state where the late-arriving shield machine has arrived and the area behind it is frozen. Figure 5 is a cross-sectional view showing the state in which the inside of the shield machine has been disassembled and the lining has been installed and joined, and Figure 6 is a cylindrical frozen wall in front of the first-come-first-served shield machine according to the second invention. A cross-sectional view of the hole after it has been drilled and penetrated by a later-arriving shield machine, Figure 7 is a cross-sectional view of the drilling chamber before it is widened, Figure 8 is a longitudinal cross-sectional view of the hole, and Figure 9 is a vertical cross-sectional view of the same. FIG.

First Invention■ Filling of frozen soil from the arriving shield, freezing a Curve boring is performed from inside the shield machine that arrived first so that the frozen soil to be created is shaped like a tulip. In this curved boring, the hole is drilled using a method such as steerable boring, such as the small-diameter muddy water propulsion pipe construction method, and if the ground is in a stable condition, the propulsion pipe is extracted while displacing muddy water to maintain the hole wall. ,
Insert a flexible cryotube one size smaller into the excavation hole, and if the ground is not stable, insert the bulkhead device of the muddy water propulsion tube into the propulsion tube one size larger. A small flexible cryotube is inserted to fill the void with a filler such as muddy water.

That is, FIG. 1 shows a case where the ground is in a good stable state. First, a double packer 3 for drilling pipes and for freezing pipes is attached to the shield steel plate 2 of the shielding machine 1, and first, a maneuverable boring, for example, a small A hole is drilled using the muddy water propulsion pipe method, the propulsion pipe is extracted while replacing muddy water to maintain the hole wall, a flexible freezing pipe 4 is buried, and the freezing method is used to create a hole, as shown in Figure 3. Create a tulip-shaped frozen wall F. In addition, Figure 2 shows a case where the stability of the ground is poor. A hole is drilled using the propulsion tube 5, which is the same as the propulsion tube described above, and muddy water etc. are poured into the packer 3 while leaving the bulkhead device @5a. At the same time, a freezing tube 4 is buried, a filling material 6 such as mud water is filled in the gap between the propulsion tube 5 and the freezing tube 4, and a refrigerant is passed through the freezing tube 4, as shown in FIG. This will create a tulip-shaped frozen wall F.

b.The construction period for the tulip-shaped frozen wall F is about the same number of days as for the construction of a conventional frozen wall (2 months for temporary construction and 1 month for freezing), but this can be done by using a later-installed shield machine. If the work is carried out three months before the arrival of 1a, these three months will be irrelevant to the overall construction process, and the work after that will become a necessary process.

■ The arrival of the shield machine and the frozen later-arriving shield machine 1a, as shown in Figure 4,
After arriving at the destination, after assembling the segment freezing plate 7 to the segment of the later-attached shield machine 1a, the freezing of the Sagme freezing-freezing treatment 7 can be performed simply by assembling the segment freezing plate 7 on the segment of the later-attached shield machine 1a and performing the cooling equipment and piping work. Unlike the method, there is no need to bury the frozen pipe from the later-arriving shield machine la, and the later-arriving shield machine 1a is refrozen by the thawing width of the frozen soil wall F upon arrival of the later-arriving shield machine 1a. By freezing the shield segments with the freezing plate 7, construction of the 5M structure can begin.Even including the temporary construction of the segment freezing plate 7 and the refreezing period, a period of 0.5 months (about 2 weeks) is sufficient. be.

(1) Disassembly and lining The dismantling and lining of the shield machine are the same as in the past, namely, the cutter a and the bulk chamber are dismantled, a primary lining is applied with steel segments 8, and both seals l-tunnels are joined.

Putting the above processes together, the implementation process will take 0.5 months for temporary construction, refreezing, and dismantling in the later-arriving shield machine.

Only 1 to 1.5 months of lining work and 1.5 months of frozen underground joints.
The process can be completed in about 5 to 2 months, and the time required for the entire process can be substantially reduced to 172 to 1/3 of the conventional method.

Second invention This second invention is suitable for cases where it is inappropriate to create a tulip-shaped frozen wall due to ground conditions or other circumstances. A hole drilling chamber 11 is installed in a watertight and movable manner, and the hole drilling chamber 11 is watertightly widened by a widening member 12 to protrude to the outside of the shielding machine 1. A horizontal frozen pipe 13 is buried outside and in front of the shield machine 1 to create a cylindrical frozen wall F' having an inner diameter slightly larger than the diameter of the later shield machine 1a. After penetrating the frozen soil wall F' and assembling the segment freezing plate 14 behind the later-attached shield machine 1a and freezing it to stop water, the cutter a, bulk chamber, etc. of both shield machines are dismantled, and the steel The shield tunnel is joined by applying a primary lining using segments 8, etc., but usually the width of the drilling chamber is expanded.

The burying and freezing of the horizontal freezing pipe, the arrival of the later-arriving shield machine, and the freezing of the later-arriving side are carried out as follows.

■Plastics” J Shi Hisaoi- The drilling chamber 11 installed in the segment 10 has a drawing board 21.
Fix the cutter face 22 on the outside of this drawing board 2I.
, two motors M for driving the canter face 22 are installed inside each, and when the top of the shield machine reaches 1 to 2 meters before the predetermined position, the segment 10
Assemble the segments in the same way as normal segments.

When the shielding machine 1 reaches a predetermined position and stops, the motor M is driven to rotate the canterface 22 while simultaneously feeding muddy water from the muddy water supply port 23 provided on the drawing board 21, and also cutting. The earth and sand are discharged from the mud handling port 24.

On the other hand, a reaction force receiver 25 is temporarily installed inside the interior segment, and the widening member 12 is watertightly connected to the inside of the drilling chamber 11 by welding or the like, and the jack 26 attached to the reaction force receiver is used to push it up and cut the hole. The width of the hole chamber 11 is expanded until the tip of the hole hole chamber 1 reaches a predetermined position, and then the next hole chamber is expanded in the same way to cover the entire circumference of the shield tunnel. A drilling chamber 11 is formed which is widened and protrudes to the outside of the shield tunnel.

(Fang Water Ball Encai 1 Summer Technology Kasa, Engei After widening the drilling chamber 11 as described above, the horizontal freezing pipe 13 is then buried from the drilling chamber 11.
Since the length of the drilling chamber 11 is short, the horizontal freezing pipe 13 must be constructed by connecting short steel pipe pieces. 5-4
B. A threaded pipe with a length of 20 to 30 cm is used, and a 2 to 2.5 B freezing steel pipe is connected and inserted into the pipe by welding or the like to form the freezing pipe 13. The reason why the freezing pipe 13 has a double pipe structure for drilling and freezing is to prevent the frozen soil from being eroded by leakage of the cooling solvent. Also,
The freezing tube 13 is buried by installing a hole drilling packer 27 inside the width expanding member 12.

When the cooling solvent is circulated through the buried freezing pipe 13 as described above and the ground around it is frozen, a cylindrical frozen wall F' is created.

Therefore, it takes about one month to expand the width of the drilling room in (■), and it takes about the same number of days to bury and freeze the frozen pipe as it does to create a conventional frozen soil wall, but it takes a lot of time during preparation and temporary construction. If these tasks are carried out in parallel, and if these tasks are carried out three months before the arrival of the later-arriving shield machine, these three months will be unrelated to the overall construction process, and subsequent work will be The work becomes a necessary process.

■ Freezing of the rear-arriving side after the arrival of the later-arriving shield machine The later-arriving shield machine 1a enters the above-mentioned frozen soil wall F', and when the shield machine 18 enters the predetermined position, the segment freezing plate 14 is placed behind it. Assemble and install a cooling device (not shown) to freeze the frozen soil wall F'' and the segment freezing plate 14.

The rest is the same as the first invention.

■Demolition, lining This is similar to that in the first invention.

Taking all the above steps into account, the construction period required for the joining process is 0.2%, since the construction period required for expanding the width of the drilling chamber 11 and the creation of frozen soil are not included in the frozen underground joining process. It will take only 5 months and 1 to 1.5 months for demolition and lining, and the frozen underground bonding will be completed in about 1.5 to 2 months, significantly reducing the construction time compared to conventional methods. can be shortened.

〔Effect of the invention〕

The present invention is as described above, and involves staggering the timing of arrival of two shield machines that are to be started and excavated in opposition to each other to form a shield tunnel at a point where the shield tunnels are to be joined.
A horizontal tulip-shaped frozen wall that allows the subsequent shield machine to penetrate, or a cylindrical frozen wall with an inner diameter slightly larger than the diameter of the later-arrived shield machine, is created on the tip side of the first-arriving shield machine, and inside the frozen soil wall. Infiltrate the shield machine that arrived later.

All you need to do is assemble a segment freezing plate or install a pasted freezing pipe at the rear of the later shield machine to stop freezing water at the rear, and then dismantle the cutters and bulk chambers of both shield machines using the usual method. Then, by constructing the method lining, the shield tunnel can be joined, so the construction period for the joining can be significantly shortened compared to the conventional method, and the construction cost can be significantly reduced accordingly. I can do it.

[Brief explanation of drawings]

Figures 1 and 2 are diagrams showing the state in which frozen pipes are buried; Figure 1 is an explanatory diagram when the ground is in a stable state;
The figure is an explanatory diagram when the stability of the ground is poor, Figure 3 is a cross-sectional view of the state where tulip-shaped frozen soil has been created, and Figure 4 is a cross-section of the state where the late-arriving shield machine has arrived and the area behind it is frozen. Figure 5 is a cross-sectional view showing the state in which the inside of the shield machine has been disassembled and the lining has been installed and joined, and Figure 6 is a cylindrical frozen wall in front of the first-come-first-served shield machine according to the second invention. A cross-sectional view of the hole after it has been drilled and penetrated by a later-arriving shield machine, Figure 7 is a cross-sectional view of the drilling chamber before it is widened, Figure 8 is a longitudinal cross-sectional view of the hole, and Figure 9 is a vertical cross-sectional view of the same. Plan view, Figures 10 and 11
The figure is an explanatory diagram of a conventional method. 1... First-arriving shield machine, 1a... Later-arriving shield machine, 2... Shield steel plate, 3... Packer, 4...
・Flexible freezing tube, 5. Propulsion tube, 6. Filler, 7.
・・Segment frozen plate, F・・Tulip-shaped frozen soil wall,
Fa: Refreeze, 10: Segment, 11: Drilling chamber, 12: Width expansion member, 13: Freezing tube. 14...Segment freezing plate, 21.Panel, cutter face, M...Motor

Claims (1)

[Claims] 1. In a shield tunnel joining method in which two shield machines face each other and dig underground to form and join a shield tunnel, the timing of the arrival of the shield machines at the point to be joined is staggered, and the shield tunnel is first arrived at. Drilling holes in the ground in an arc or curve shape using steerable boring from inside the shield machine,
A flexible freezing pipe is inserted into the excavation hole, a horizontal tulip-shaped frozen wall is created in time for the arrival of the later-arriving shield machine, and after the later-arriving shield machine is penetrated into the frozen soil wall. After assembling a segment freezing plate or installing a pasted freezing pipe at the rear of the shield machine, the water is stopped at the rear of the shield machine, and then the cutter, bulk chamber, etc. of the shield machine are dismantled, and the primary covering is made with steel segments, etc. An underground joining method for shield tunnels, which is characterized by joining shield tunnels by performing construction. 2. In the method of joining shield tunnels, in which two shield machines face each other and dig underground to form and join a shield tunnel, the timing of the arrival of the shield machines at the point to be joined is staggered, and the segment immediately after the first shield machine arrives. A mechanism that can expand the width of the drilling chamber for horizontal freezing management equipment is installed, and the horizontal freezing pipe is inserted from the expanded drilling chamber during the period until the later-arriving shield machine reaches the predetermined point. Bury up to the tail of the shield machine that will arrive later, and create a cylindrical frozen wall that is slightly larger than the diameter of the shield machine.
After the later-arriving shield machine arrives within the frozen soil wall, water is stopped at the rear by assembling a segment freezing plate or installing freezing equipment behind the latter-applying shield machine, and then the shield machine is operated. A method for joining a shield tunnel, which comprises dismantling cutters, bulk chambers, etc., constructing a primary lining using steel segments, etc., and joining the shield tunnel.