JP4082457B2 - Propulsion concrete pipe and its propulsion method - Google Patents

Description

  The present invention relates to a concrete pipe for propulsion capable of observing tunnel ground and its propulsion method.

  In recent years, laying concrete pipes is often difficult to perform due to restrictions due to urban road conditions, so propulsion methods using concrete pipes for propulsion have been used frequently. In this propulsion method, the propulsion concrete pipe is suspended from a start shaft (not shown), and the propulsion concrete pipe is repeatedly propelled and connected while laying the propulsion pipe while excavating the earth and sand by a conventional semi-shield machine method. Is.

As shown in FIG. 1 which is an embodiment of the present invention, the concrete pipe for propulsion used in the above construction method has an injection hole 4 formed through the pipe wall 1 of the concrete pipe P for propulsion, and in the longitudinal direction. At least two places are formed at intervals.
For the construction of the propulsion pipe, first, the concrete pipe P for propulsion is lifted using the two injection holes 4 and hung down to the starting shaft. Next, the excavation and connection of the propulsion concrete pipe P is repeated while excavating the earth and sand by a conventional method. In the process of propulsion, the lubricant is injected into the outer periphery of the concrete pipe P for propulsion using the injection hole 4 of the predetermined concrete pipe P for propulsion to reduce the propulsive force.
After the completion of the propulsion, the mortar is filled from the injection hole 4 into the gap between the tunnel ground and the propulsion concrete pipe P in the same manner as the above-mentioned lubricant to prevent ground subsidence.

In addition, although the magnitude | size of a thrust required for the press injection of the concrete pipe P for propulsion is decided by the magnitude | size of the frictional resistance force by the contact with the outer peripheral surface of the concrete pipe P for propulsion, and a tunnel natural ground (tunnel inner peripheral surface), Recently, propulsion pipelines tend to be longer and curved. As the propulsion pipe length increases in this way, the frictional resistance increases and the necessary thrust force increases as the contact area between the entire propulsion pipe row and the tunnel ground increases.
Therefore, in the propulsion method, usually, a process of injecting a lubricant between the outer periphery of the propulsion pipe and the tunnel ground is performed in order to reduce the frictional resistance.
However, if such a lubricant injection process is performed over the entire area between the propulsion concrete pipe P and the tunnel ground, a large amount of lubricant is required, which is uneconomical.
For this reason, it has been attempted to focus on such a place where the frictional resistance between the propulsion pipe and the tunnel ground is particularly large.

However, in the conventional construction management, it has not been fully understood where the frictional resistance between the propulsion pipe and the tunnel ground is particularly large. I couldn't say that. Propulsion devices that improve this have been proposed.
That is, as shown in FIGS. 11 and 12, this apparatus includes a triple layer of a measurement layer 41 sandwiched by a stress buffer layer 42 at a predetermined position (connection portion) of the concrete pipe P row for propulsion and the measurement layer 41. A plurality of stress measuring means 40 provided with a plurality of strain detecting means (strain gauges) 43 attached to the inner peripheral side of the tube are arranged at appropriate intervals in the length direction of the propelling pipe row, and these stress measuring means 40 The observed stress at each point of the measurement layer 41 is detected by the strain gauge 43 and the propulsion concrete pipe P is installed at the installation portion of each stress measuring means 40 based on the measured stress acting on the propulsion concrete pipe P. Is provided with a calculation means 44 for calculating the thrust acting on (the thrust acting on each measurement section). Thus, the calculated stress at each point of the stress measurement cross section is calculated based on the stress plane (regression plane) determined from the observed stress data. In addition, 45 is a shield type propulsion device, 46 is a main pushing jack, and 47 is an intermediate pushing jack. (For example, refer to Patent Document 1).
JP 2000-160985 A

However, if the calculated stress at each point of the stress calculation cross section is calculated from the observed stress data and the stress is greater than or equal to a predetermined value, the lubricant will be injected, but the gap is small at that stress value. It is very difficult to judge whether the lubricant is not spread in the gap (or insufficient injection). Therefore, even if the point of important injection of the lubricant is determined, there may be a problem that the lubricant may be injected unnecessarily or the propulsive force may not be reduced.
In addition, since a large number of strain detection means 43 are arranged on the measurement layer 41, there are problems that the structure is complicated and the work for the arrangement and removal is complicated.

  The present invention reliably observes the condition of the tunnel ground during propulsion, and based on the result, aims to reduce the propulsion force by injecting lubricant without excess or deficiency, and has a simple structure and easy setup work. There is a problem.

In order to solve the above-described problems, the present invention is directed to a concrete pipe for propulsion having an injection hole for a lubricant and / or a backfill material, and a natural observation hole is formed on the pipe wall from the inner surface toward the outer surface. And the structure which provided the transparent plate which faces the outer surface of the said pipe wall in the said natural mountain observation hole was employ | adopted.
According to this configuration, the tunnel ground condition from the ground observation hole through the transparent plate, that is, the state of filling the sliding material into the gap between the concrete pipe for propulsion and the tunnel ground is easily and visually observed through the transparent plate. It can be observed reliably. As a result, when the gap is narrow or the filling of the lubricant is insufficient, the propulsive force is reduced by filling the lubricant from the injection hole according to the state. Moreover, since the state of injection of the lubricant into the gap can also be confirmed through the observation hole, it is possible to inject the lubricant without excess or deficiency, thereby saving the injection amount.
In addition, since the natural ground observation hole is formed in the tube wall and a transparent plate is provided in the natural ground observation hole, the structure is simple and the setup work for natural ground observation is easy. is there.

Further, a configuration is adopted in which a cylindrical socket is embedded in the natural mountain observation hole and a transparent plate facing the outer surface of the tube wall is screwed into the cylindrical socket. According to this configuration, after the completion of propulsion, the transparent plate can be twisted back from the cylindrical socket and reused.
Moreover, the structure which provided the steel ring in the outer peripheral surface of the pipe wall containing the said natural ground observation hole was employ | adopted. According to this configuration, this steel ring reinforces the strength reduction of the tube wall that accompanies the formation of the natural ground observation hole.
In addition, a configuration is adopted in which a cylindrical body is detachably provided in the cylindrical socket, and a transparent plate facing the outer surface of the tube wall is screwed into the cylindrical body. According to this configuration, after the propulsion is completed, the inner cylinder including the transparent plate can be removed from the cylindrical socket and reused.
Moreover, the structure which provided the said transparent plate in the inner surface position dented from the outer surface of the said tube wall of the said natural mountain observation hole was employ | adopted. According to this configuration, the transparent plate is less worn or damaged on the outer surface of the transparent plate due to contact (sliding contact) with the tunnel ground during propulsion.

  Further, a configuration is adopted in which a cleaning water supply passage is formed in which one end is opened in the recess formed outside the transparent plate and the other end is opened in the inner surface of the tube wall. According to this configuration, during propulsion, the earth and sand collected in the concave portion on the outer side of the transparent plate is washed with the washing water ejected from the washing water supply passage through the opening, so that the tunnel ground through the transparent plate is removed. You can observe the situation accurately.

  Also, the ground wall observation hole is formed in the tube wall, and a concrete pipe for propulsion in which a transparent plate is provided in the ground surface observation hole is buried in the ground by a propulsion method, and illumination is performed toward the ground mountain observation hole. A configuration was adopted in which the condition of the tunnel ground was observed through the transparent plate in light of the tool. According to this configuration, the tunnel ground can be more reliably observed (by visual observation) through the transparent plate by illuminating the inside of the tunnel with the illuminator.

  As described above, according to the present invention, a natural ground observation hole is formed in the tube wall of the concrete pipe for propulsion from the inner surface toward the outer surface, and the transparent plate facing the outer surface of the tube wall is formed in the natural mountain observation hole. Since it is provided, it is possible to easily and reliably observe the tunnel ground condition outside the transparent plate, that is, the size of the gap between the propulsion concrete pipe and the tunnel ground and the state of filling the sliding material in the gap. As a result, by filling the gap with a lubricant, the propulsive force is reduced and further long-distance propulsion is possible.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a first embodiment, and a propulsion concrete pipe P includes a receiving port 2 formed by a collar 2a fixed to one end of a tube wall 1, and an insertion port 3 having a circumferential groove 3a formed at the other end. , And further has an injection hole 4 for a lubricant and a backfill material formed through the tube wall 1. Then, the insertion port 3 of the other pipe P is connected to the receiving port 2 of the one pipe P through a water stop rubber (not shown) fitted in the circumferential groove 3a.
Reference numeral 5 denotes a natural mountain observation hole formed in the pipe wall 1 of the propulsion concrete pipe P so as to penetrate the outer surface from the inner surface thereof. The tubular wall 1 has a recess 6 and a female screw 7a cut from the inner surface to the outer surface. Sockets 7 are arranged concentrically. The natural ground observation holes 5 are formed at four positions in the circumferential direction of the concrete pipe P for propulsion in the circumferential direction.
Reference numeral 9 denotes a cylindrical body in which a male screw 9a and a female screw 9b are formed. The male screw 9b of the cylindrical body 9 is screwed into the female screw 7a of the cylindrical socket 7 and is detachably fixed.

Reference numeral 10 denotes a transparent plate facing the outer surface of the tube wall 1 of the natural ground observation hole 5, and the male screw 10 a of the transparent plate is screwed into the female screw 9 a of the cylindrical body 9 and fixed. The transparent plate 10 is preferably disposed at an inner surface position slightly recessed from the outer surface of the tube wall 1 to form a recess 12 on the outer side of the transparent plate 10. Reference numeral 11 denotes an illuminator, for example, an electric lamp that a person shines toward the transparent plate 10.
Reference numeral 13 denotes a cleaning water supply passage formed on the pipe wall 1, for example, a cleaning water supply pipe. One end of the cleaning water supply pipe is opened on the inner surface of the pipe wall 1 (water supply port 14), and the other end is opened on the side surface of the recess 12. 15) A wash water hose (not shown) is connected to the water supply port 14, and after washing, a water stop plug (not shown) is screwed to stop external water.
Reference numerals 16 and 17 denote sealing materials interposed between the lower end surface of the cylindrical socket 7 and the flange portion 9c of the cylindrical body 9 and between the cylindrical body 9 and the transparent plate 10, respectively.

In order to propel using the propulsion concrete pipe P, as shown in FIG. 10, first, the propulsion concrete pipe P is suspended from a start shaft Q provided at a predetermined position of a tunnel ground R. Next, the propulsion concrete pipe P is propelled with the propulsion jack T while excavating the earth and sand with the semi-shield machine S, and the connection of the pipes P ₁ , P ₂ , P 3, Pn is repeated in sequence. Pipes are laid.
During this propulsion, the lubricant pipe K is injected into the gap 18 between the outer periphery of the concrete pipe P for propulsion and the tunnel ground R using the injection hole 4 to reduce the propulsive force of the concrete pipe P for propulsion. Form a road.
Further, since the transparent plate 10 is in a position recessed from the outer surface of the tube wall 1, the outer surface is less worn or damaged due to contact (sliding contact) with the tunnel ground R during propulsion.

And, during the propulsion, from the inside of the natural ground observation hole 5 of the concrete pipe P for propulsion, the lighting fixture 11 held in the hand is illuminated toward the transparent plate 10, and the situation of the tunnel natural mountain R on the outer periphery of the transparent plate 10; That is, the size of the gap 18 between the concrete pipe P for propulsion and the tunnel ground R and the state of filling the lubricant in the gap 18 are visually observed.
In the observation from the natural mountain observation hole 5, since the earth and sand adhere to the outer surface of the transparent plate 10 and is dirty, the cleaning water is jetted into the recess 12 through the cleaning water supply pipe 13, and the transparent plate 10 By cleaning the outer surface, the condition of the tunnel ground mountain R (the gap 18) over the transparent plate 10 can be more reliably observed. As a result of this observation, if the gap 18 is narrow or the filling of the lubricant K is insufficient, the lubricant K is filled from the injection hole 4 of the propulsion concrete pipe P. That is, in this case, when the gap 18 is narrow, it is useless to inject a large amount of the lubricant K, and when there is a predetermined gap 18 but the lubricant K is hardly injected, a lot of the lubricant is used. Fill the gap 18 with K. As a result, the lubricant K without excess or deficiency is injected and the driving force is reduced. Moreover, the filling state of the gap 18 can be confirmed from the natural ground observation hole 5, which saves the injection amount. After cleaning, the water inlet 14 is closed to prevent water from entering the pipe P from the ground.

After completion of the propulsion, after filling the backfilling material, for example, mortar M, into the gap 18 between the tunnel ground R and the propulsion concrete pipe P from the injection hole 4, and then removing the cylindrical body 9 including the transparent plate 10 If the mortar m is also filled into the natural mountain observation hole 5 and the recess 6, the propulsion work is completed.
The cylindrical body 9 including the transparent plate 10 can be reused by removing it from the cylindrical socket 7.

The outer diameter of the semi-shield machine S is set to be about 10 to 80 mm larger than the outer diameter of the propulsion concrete pipe P connected thereto. For this reason, the tip of the leading propulsion concrete pipe P connected to the semi-shielding machine S is connected (supported) concentrically with the semi-shielding machine S, and the outer periphery of the leading propulsion concrete pipe P and the tunnel ground The gaps 18 with R are almost equal. Therefore, it is possible to observe the tunnel ground R from the observation holes 5 at four places on the circumference of the concrete pipe P for propulsion. On the other hand, the propulsion concrete pipe P several times after the leading propulsion concrete pipe P is not able to be observed because its lower surface comes into contact with the bottom of the tunnel (in contact with the excavated ground) due to its own weight or the like. Thus, the observation holes 5 of the concrete pipe for propulsion P connected thereafter may be at three places on the upper and left and right sides excluding the lower part. Further, when there is little variation in the soil around the tunnel ground R to be excavated, the observation hole may be one.
As the subsequent propulsion concrete pipe P, a normal propulsion pipe is used, and the propulsion concrete pipe P with an observation hole is connected every 50 to 100 m, and the filling state of the lubricant is observed from the observation hole 5.

  FIG. 5 shows a second embodiment. In this embodiment, a transparent sealing plate 20 is detachably set on the cylindrical body 9 of the first embodiment. In this case, the male screw 20 a of the sealing plate 20 is screwed and fixed to the female screw 9 b of the cylindrical body 9, and the sealing material 22 is interposed between the end surface of the cylindrical body 9 and the flange 20 b of the sealing plate 20. Then, water is poured into the sealed space formed by the cylindrical body 9, the transparent plate 10, and the sealed plate 20 from the inlet 20 c through the hose 21 to fill the water. Thereby, dew condensation on the inner surface of the transparent plate 10 can be prevented, and the situation of the tunnel ground mountain R can be observed more reliably.

  FIG. 6A shows a third embodiment. In this embodiment, the cylindrical body 9 in the first embodiment is omitted, and the transparent plate 25 is exposed to the outer surface of the tube wall 1 in the cylindrical socket 7. It is a set. In this case, the male screw 25 a of the transparent plate 25 is screwed into the female screw 7 a of the cylindrical socket 7 and fixed. The transparent plate 25 may be left as it is or may be removed when the mortar m is filled in the ground observation hole 5 after propulsion.

  FIG. 6B shows a fourth embodiment. In this embodiment, the cylindrical body 9 is omitted and the transparent plate 27 is attached to the outer surface of the tube wall 1 in the cylindrical socket 26 as in the third embodiment. It is a set that we faced. In this case, the male screw 27 a of the transparent plate 27 is screwed into the female screw 26 a of the cylindrical socket 26 and fixed, and the sealing material 28 is interposed between the cylindrical socket 26 and the stepped portion of the transparent plate 27.

7 and 8 show a fifth embodiment. In this embodiment, a steel plate is arcuated in the third embodiment (see FIG. 6A) in which a transparent plate 25 is set in a cylindrical socket 7. FIG. A steel ring 30 formed by bending is integrally provided on the outer peripheral surface of the pipe wall 1, and the cylindrical socket 7 is concentrically formed in four through holes 31 formed in the steel ring 30. The observation hole 5 is formed integrally by welding. The steel ring 30 reinforces the decrease in strength of the tube wall 1 due to the formation of the natural ground observation hole 5. In this case, the male screw 25 a of the transparent plate 25 is screwed into the female screw 7 a of the cylindrical socket 7 and fixed. Inward ribs 32 are formed on both ends of the steel ring 30 over the entire circumference. The ribs 32 increase the rigidity of the steel ring 30 and firmly integrate with the tube wall 1. Reference numeral 33 denotes an embedding waterproofing material.
The transparent plate 25 may be left as it is or may be removed when the mortar is filled in the natural mountain observation hole 5 after propulsion.
In the fifth embodiment, the steel ring 30 is incorporated in the third embodiment. However, the steel ring 30 can be applied to the other embodiments.

  The formation of the natural ground observation hole 5 is performed in the following order. In FIG. 9, the ground observation hole forming die 37 is set in the centrifugal force forming cylindrical mold 36. The ground mountain observation hole forming die 37 is composed of a cylindrical socket 7 also serving as a mold, an upper die 37a, and a conical lower die 37b, and a male screw 7a of the cylindrical socket 7 is screwed with a male screw of the upper die 37a. The lower die 37b is fitted to the inner wall of the mold 36 and assembled to the cylindrical socket 7, and a fixing bolt 38 is screwed into the lower die 37b from the outside of the mold 36 and fixed to the mold 36. In a state where the ground mountain observation hole forming die 37 is set in the mold 36, concrete is poured into the mold 36 rotating on a centrifugal casting machine (not shown) by a conventional method to form a propulsion concrete tube with centrifugal force. After pipe making, steam curing is performed together with the mold 36, and after the concrete is hardened, the fixing bolt 38 is removed and the lower mold 37b is removed. Next, after the pipe P is removed from the mold 36 and cured, the upper mold 37a is removed from the cylindrical socket 7 to obtain the propulsion concrete pipe P in which the ground observation hole 5 is formed. Therefore, the natural ground observation hole 5 is formed in the tube wall 1 by the cylindrical socket 7 embedded in the recess 6 from the inner surface to the outer surface of the tube wall 1. The cylindrical socket 7 is embedded in the pipe wall 1 of the concrete layer by an anchor 39 and integrated.

The sealing materials 16 and 17 are provided between the cylindrical socket 7 and the cylindrical body 9, the sealing material 22 is provided between the cylindrical body 9 and the sealing plate 20, and the sealing material 28 is provided between the cylindrical socket 26 and the transparent plate 27. To increase the water-stopping property and prevent the outside water from flowing into the pipe P during propulsion.
In the above embodiment, the natural mountain observation hole 5 of the tube wall 1 is formed by connecting the recess 6 and the cylindrical socket 7 from the inner surface to the outer surface of the tube wall 1. The recess 6 can be omitted by extending the end to the inner surface of the tube wall 1.
Moreover, the corrosion by the fluids, such as the sewage which flows through the inside of the pipe | tube P, is reduced significantly by making the material of the cylindrical socket 7 into non-rust steel.

The concrete pipe for propulsion concerning a 1st embodiment of the present invention is shown, (a) is a partially notched front view, (b) is an AA line arrow view of the figure (a). The partial expanded sectional view which shows the natural ground observation hole in 2nd Embodiment BB line view of FIG. The fragmentary sectional view which shows the state after mortar injection | pouring into the natural ground observation hole in the 1st Embodiment of this invention The partial expanded sectional view which shows the natural ground observation hole in the 2nd Embodiment of this invention The natural mountain observation hole in embodiment of this invention is shown, (a) is the partial expanded sectional view of 3rd Embodiment, (b) is the partially expanded sectional view of 4th Embodiment. Partially cutaway front view showing a concrete pipe for propulsion according to a fifth embodiment of the present invention The ground observation hole in the 5th Embodiment of this invention is shown, (a) is a partial expanded sectional view, (b) is the CC arrow directional view of the same figure (a). The fragmentary sectional view of the state which attached the mold for earth ground observation hole formation concerning a 1st embodiment of the present invention to a formwork Overall configuration diagram of the propulsion method according to the present invention Overall configuration diagram of conventional thrust monitoring device The stress measuring device which concerns on a prior art example is shown, (a) is sectional drawing, (b) is the DD arrow line view of the figure (a).

Explanation of symbols

P Concrete pipe for propulsion K Lubricant 1 Pipe wall (concrete layer)
2 Receiving port 3 Insertion port 4 Injection hole 5 Ground mountain observation hole 6 Recess 6a Step part 7 Cylindrical socket (outer cylinder)
7a Female thread 9 Cylindrical body (inner cylinder)
9a Male thread 9b Female thread 9c Flange part 10 Transparent plate 10a Male thread 11 Illuminator (light source)
12 Concave portion 13 Washing water supply pipe 14 Water supply port 15 Cleaning ports 16 and 17 Sealing material 18 Clearance 20 Sealing plate 21 Water injection hose 25 Transparent plate 26 Cylindrical socket 27 Transparent plate 30 Steel ring 31 Through hole

Claims (5)

Either one of the lubricant and back-filling material, or possess both and the tube wall (1) of the injection hole (4) for injecting between the tunnel natural ground from its inner surface to the pipe wall (1) A natural ground observation hole (5) for observing the natural ground is formed toward the outer surface, and a transparent plate (10, 25, 27) facing the outer surface of the pipe wall (1) is formed in the natural ground observation hole (5). Propulsion characterized in that in the provided concrete pipe for propulsion, the transparent plate (10, 25, 27) is provided at an inner surface position recessed from the outer surface of the pipe wall (1) of the ground observation hole (5). Concrete pipe. A washing water supply path (13) is formed in which one end is opened in the recess (12) formed outside the transparent plate (10, 25, 27) and the other end is opened in the inner surface of the tube wall (1). The concrete pipe for propulsion according to claim 1 characterized by things. Cylindrical sockets (7, 26) are embedded in the natural mountain observation hole (5), and transparent plates (25, 27) facing the outer surface of the tube wall (1) on the inner periphery of the cylindrical sockets (7, 26). The concrete pipe for propulsion according to claim 1 or 2, characterized by being screwed . A steel ring (30) is provided on the outer peripheral surface of the pipe wall (1), and the cylindrical socket (7) is integrated concentrically with a through hole (31) formed in the steel ring (30) by welding. The concrete pipe for propulsion according to any one of claims 1 to 3, wherein the ground observation hole (5) is formed . A cylindrical body (9) is screwed into a female screw (7a) of the cylindrical socket (7) and is detachably fixed, and the inner periphery of the cylindrical socket (7) is interposed via the cylindrical body (9). The propulsion concrete pipe according to any one of claims 1 to 4, wherein the transparent plate (10) is screwed .

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