JP2009052238A - Entrance sealing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To seal both an outer peripheral surface and an inner peripheral surface of a casing when horizontally jacking the casing with a cutter bit attached to the tip, while rotating the casing. <P>SOLUTION: This entrance sealing apparatus comprises a cylindrical inside seal case 11 fixed to guard concrete at one end and having an outer diameter smaller than the inner diameter of the casing; a cylindrical outside seal case 12 fixed to guard concrete at one end to be arranged coaxially to the inside seal case 11 and having an inner diameter larger than the outer diameter of the casing 16; a ring-shaped inside seal member 22 detachably fixed to the outer peripheral surface of the inside seal case 11; and a ring-shaped outside seal member 23 detachably fixed to the inner peripheral surface of the outside seal case 12. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an entrance seal device at an underground structure joint, for example, an entrance seal device used in a construction method for constructing a tunnel for an escape passage that is joined to an existing tunnel at a side surface.

For example, in a road tunnel in which upper and lower lines extend in parallel, an evacuation passage that connects the upper and lower lines is provided.
FIG. 14 shows a cross section of a road tunnel in which an evacuation passage is constructed.

In FIG. 14, reference numeral 1 indicates an up road road tunnel, and 2 indicates a down road tunnel. The upper and lower road tunnels 1 and 2 are shield tunnels. The evacuation passage 3 is joined at the side surfaces of the road tunnels 1 and 2 so as to connect the two. The evacuation passage 3 is constructed after the road tunnels 1 and 2 are completed.
Conventionally, when the evacuation passage 3 is constructed, prior to excavation of the evacuation passage, it has been indispensable to carry out large-scale ground improvement work.

As an auxiliary method of this kind of ground improvement, there is a chemical solution injection method that increases the strength of the ground by injecting water glass or cement-based injection material into the ground, or by temporarily freezing the pore water in the ground. The freezing method that increases the strength is typical.
In a large-scale road tunnel such as an expressway, the ground improvement method itself, which is a preparation before constructing an evacuation passage, is a large-scale construction method. In addition, in the chemical solution injection method, there is a concern about adverse effects on water quality and water veins of rivers and wells existing in the vicinity. In the freezing method, there is a great influence on the surrounding ground such as uplift due to freezing and deformation due to thawing.
In recent years, therefore, development of a method for joining and constructing an evacuation passage has been promoted without implementing an auxiliary method for ground improvement.
As one of the new construction methods, the application of a method of vertically propelling steel pipes is being studied. In this new construction method, one tunnel side is used as a starting pit, and a casing made of a large-diameter steel pipe with a cutter bit at the tip is rotated horizontally and propelled to the other tunnel side.

  According to this new construction method, the large-diameter casing can be propelled itself without strengthening the ground, so the tunnel for the evacuation passage can be opened by removing the earth and sand inside the steel pipe after the propulsion is completed. Therefore, it is expected that the construction method and cost will be significantly reduced by omitting the auxiliary construction method for ground improvement.

  However, when a casing with a cutter bit is pushed horizontally as in the new construction method described above, it is necessary to provide an entrance seal device on the protective concrete on the start pit side in order to prevent the intrusion of groundwater under ground pressure. .

  However, the conventional entrance seal device has a problem that the casing does not rotate and only the outer peripheral portion of the casing is sealed. For this reason, it is impossible to prevent groundwater from entering the inside of the casing from the ground.

  Accordingly, an object of the present invention is to solve the problems of the prior art, and to seal both the outer peripheral surface and inner peripheral surface of the casing when propelling horizontally while rotating the casing with a cutter bit at the tip. Another object of the present invention is to provide an entrance seal device.

  In order to achieve the above-mentioned object, the present invention provides a propulsion method from protective concrete placed in the start-side underground structure in order to open a tunnel connecting the start-side underground structure and the arrival-side underground structure. An entrance seal device that seals both the inner and outer peripheral surfaces of a casing propelled by a cylindrical inner seal case having one end fixed to the protective concrete and having an outer diameter smaller than the inner diameter of the casing; A cylindrical outer seal case having one end fixed to the protective concrete and having an inner diameter larger than the outer diameter of the casing, and an outer peripheral surface of the inner seal case so as to be coaxially disposed outside the inner seal case A ring-shaped inner seal member fixed in a removable manner, and a ring-shaped outer surface fixed in a removable manner on the inner peripheral surface of the outer seal case A seal member and is characterized in that it consists of.

  According to the present invention, when propelling horizontally while rotating a casing with a cutter bit at the tip, both the outer peripheral surface and inner peripheral surface of the casing are sealed, and a reliable water stoppage can be taken.

Hereinafter, an embodiment of an entrance seal device according to the present invention will be described with reference to the accompanying drawings.
First embodiment
FIG. 1 shows an example of construction of an underground structure joint where an entrance seal device according to a first embodiment of the present invention is used.
In FIG. 1, reference numerals 1 and 2 indicate road tunnels that constitute a highway vertical line. Here, the road tunnel 1 is set as the start side and the road tunnel 2 is set as the arrival side, and an evacuation passage is established to connect the two. Protective concrete 4 and 5 is placed on the side surfaces of the road tunnels 1 and 2. The start side protective concrete 4 and the arrival side protective concrete 5 are fixed by a plurality of tie rods 6. The construction of the evacuation passage includes a step of propelling a casing made of a large-diameter steel pipe from the start-side protective concrete 4, and a step of taking out and removing earth and sand from the casing to complete the evacuation passage.

  In FIG. 1, reference numeral 10 indicates an entrance seal device. The entrance seal device 10 is fixed to the surface of the protective concrete 4 on the starting side. The entrance seal device 10 seals both the inner and outer peripheral surfaces of the casing and stops water while propelling the casing from the protective concrete 4 by the propulsion method. In addition, in FIG. 1, 84 shows the U-shaped pipe which inject | pours a water stop material.

  Next, FIG. 2 is a view of the starting-side protective concrete 4 as viewed from the front, and FIG. 3 is an enlarged view of a portion A in FIG.

  The entrance seal device 10 is a large annular structure having a diameter of several meters, and includes an inner seal case 11 and an outer seal case 12 each having a cylindrical shape. On the outer peripheral surface side of the inner seal case 11, a ring-shaped inner seal member 22 is attached at a position indicated by hatching. On the inner peripheral surface side of the outer seal case 12, a ring-shaped outer seal member 23 is attached at a position similarly indicated by oblique lines.

Therefore, the configuration of the entrance seal device 10 will be described with reference to FIG.
In FIG. 4, a phantom line indicates a casing 16 made of a large-diameter steel pipe that is propelled while rotating. The inner seal case 11 is a cylindrical case having an outer diameter smaller than the inner diameter of the casing 16, and a flange portion 17 is formed at one end. Bolts 20 are fastened to the flange portion 17 at a predetermined interval, whereby the inner seal case 11 is fastened to a fixing ring 18 embedded in the protective concrete 4. Between such an inner seal case 11 and the outer seal case 12, a space in which a seal member for sealing the inner peripheral surface and the outer peripheral surface of the casing 16 can be disposed is formed.

  That is, the outer seal case 12 is disposed outside the inner seal case 11. The outer seal case 12 is a cylindrical case having an inner diameter larger than the outer diameter of the casing 16, and a flange portion 19 at one end is fastened to a fixing ring 21 embedded in the protective concrete 4 by a bolt 20. .

In this embodiment, the inner seal member 22 is attached to the outer peripheral surface of the inner seal case 11 in two axial directions, and the outer seal member is attached to the inner peripheral surface of the outer seal case 12 in three axial steps. 23 is attached.
The inner seal member 22 and the outer seal member 23 are ring-shaped seal members made of synthetic rubber or the like. An inclined lip portion 22 a is integrally formed on the outer peripheral portion of the inner seal member 22. The inner seal member 22 is detachably fixed to the inner seal case 11 by using mounting brackets 24a and 24b having an L-shaped cross section and a mounting bolt 26 constituting a fitting type holding frame. In the fixed state, the lip portion 22 a is inclined in the propulsion direction of the casing 16. Similarly, an inclined lip portion 23 a is integrally formed on the inner peripheral portion of the outer seal member 23. The outer seal member 23 is also detachably fixed to the outer seal case 12 using mounting brackets 25a and 25b having an L-shaped cross section and mounting bolts 26 constituting a fitting type holding frame. The inclination direction of the lip portion 23 a is the same as the inclination direction of the casing 16.

  In this embodiment, the inner seal member 22 having a two-stage structure and the outer seal member 23 having a three-stage structure have a staggered arrangement structure in which the lip portions 22a and 23a intersect each other alternately.

  In FIG. 4, 80 and 82 are cooling water pipes for supplying cooling water. Of these, the outer cooling water pipe 80 also serves as a pipe for injecting a water stop material. Reference numeral 83 denotes a grease nipple for injecting grease.

The entrance seal device according to the present embodiment is configured as described above. Next, its operation and effects will be described.
Here, FIG. 5 shows the steel pipe propulsion machine 30 installed in the road tunnel 1 on the start side. This steel pipe propulsion machine 30 is carried on a carriage 31. The cart 31 is provided with a undulating jack 32 for starting up the steel pipe propulsion machine 30. In addition, a casing 16 made of a steel pipe having a large diameter is supported in a horizontal posture on the carriage 31 via a placement portion 33 (see FIG. 6). A cutter bit 34 is attached to the tip of the casing 16 over the entire circumference. As the steel pipe propulsion machine 30, a known propulsion machine for propelling the steel pipe while rotating it is used.

  Therefore, the casing 16 can be propelled as follows while the steel pipe propulsion device 30 is erected and the entrance seal device 10 installed on the starting-side protective concrete 4 is used.

  First, in FIG. 6, a casing 16 with a cutter bit 34 at the tip is joined to a connecting casing 35 on the mounting portion 33, and the whole mounting portion 33 is slid to place the casing on the steel pipe propulsion machine 30. 16 is connected. Then, the casing 16 is inserted through the insertion port of the entrance seal device 10 while being rotated. In the entrance seal device 10, as the casing 16 enters, the lip portion 22a of the inner seal member 22 and the lip portion 23a of the outer seal member 23 are bent and deformed as shown in FIG. The entrance seal device 10 is supplied with cooling water from the cooling water pipes 80 and 82, and is supplied with lubricating oil from the grease nipple 83 to prevent the inner seal member 22 and the outer seal member 23 from being seized by the rotation of the casing 16. It is illustrated.

  Then, while the casing 16 is rotated by the steel pipe propulsion device 30 and thrust is applied, the protective concrete 4 is cut by the cutter bit 34 at the tip of the casing 16 and the casing 16 starts to be propelled.

  Eventually, the casing 16 excavates the start side protective concrete 4 and reaches the ground. In general, there are many groundwaters in the ground that are under pressure. Such high-pressure groundwater enters a gap formed outside and inside the casing 16 as indicated by an arrow. In the process of propulsion, sealing is performed by the inner seal member 22 and the outer seal member 23 of the entrance seal device 10. Since effective measures are taken against water, groundwater can be reliably prevented from entering the starting road tunnel 1.

  In FIG. 7, the flow of groundwater entering along the casing 16 is indicated by arrows. In the entrance seal device 10, the lip portion 22 a of the inner seal member 22 blocks the flow of groundwater entering along the inner peripheral surface of the casing 16 while sliding on the inner peripheral surface of the casing 16. Similarly, the lip portion 23 a of the outer seal member 23 blocks the flow of groundwater entering along the outer peripheral surface of the casing 16 while sliding on the outer peripheral surface of the casing 16.

  In addition, since the inner seal member 22 and the outer seal member 23 are arranged in multiple stages, even if the one-stage seal member is damaged or the like, the seal of another seal member is effective. Can be reliably maintained.

  In this embodiment, the two-stage inner seal member 22 and the three-stage outer seal member 23 employ a staggered arrangement structure in which the lip portions 22a and 23a alternately intersect. According to the structure, there is an advantage that the entrance seal device 10 is assembled to the protective concrete 3 and can be easily attached. Also, in terms of the sealing effect, the lip portions 22a of the inner seal member 22 and the lip portions 23a of the outer seal member 23 are alternately arranged, so that the followability of the lip portions 22a and 23a is improved and the sealing performance is further improved. Can be increased.

  Thereafter, as shown in FIG. 8, the propulsion is advanced until the reaching-side protective concrete 5 is reached while adding the connecting casing 35.

  When the propulsion is finished, the start side injects a water stop material from the water stop material injection pipe 80 in the entrance seal device 10 and the arrival side injects the water stop material from the U-shaped pipe 84. In FIG. Then, the gap between the ground and the casings 16 and 35 is stopped. After the water stop is completed, the entrance seal device 10 is removed.

  After that, when the steel pipe propulsion device 30 is removed and the earth and sand inside the protective concrete 4 and 5 and the casings 16 and 35 are removed, the evacuation passage that joins the side surfaces of the road tunnels 1 and 2 and connects them is completed.

Second Embodiment Next, FIG. 10 shows an entrance seal device according to a second embodiment of the present invention. The second embodiment is an embodiment in which abrasives 52 a and 52 b are provided at the insertion port of the entrance seal device 10.

  In FIG. 10, abrasive supply parts 54 a and 54 b are attached to the insertion port side of the entrance seal device 10. Abrasive materials 52a and 52b are attached to the ends of the abrasive material supply portions 54a and 54b. In this case, the abrasive 52 a is disposed so as to contact the outer peripheral surface of the casing 16, and the abrasive 52 b is disposed so as to contact the inner peripheral surface of the casing 16.

  As shown in FIG. 10, when the casing 16 is propelled while being rotated, the abrasive material 52a is automatically applied to the outer peripheral surface of the casing 16 by the abrasive material supply unit 54a as the casing 16 advances, and the abrasive material is supplied. The abrasive material 52b is applied to the inner peripheral surface of the casing 16 by the portion 54b. Since the lip portion 22a of the inner seal member 22 and the lip portion 23a of the outer seal member 23 slide on the inner and outer peripheral surfaces to which the abrasive is adhered, the lip portions 22a and 23a are polished with the abrasive, respectively. Therefore, the lip portions 22a and 23a can be prevented from being worn or damaged.

Third Embodiment FIG. 11 shows an entrance seal device according to a third embodiment of the present invention. The third embodiment is an embodiment in which an auxiliary rubber body 59 is disposed in the front stage portion of the entrance seal device 10.

  The auxiliary rubber body 59 is an annular rubber body. The auxiliary rubber body 59 is attached to the outer seal case 12. In each of the auxiliary rubber bodies 59, a fluid such as air or water is introduced from the pressure port 60. When the fluid is introduced, the auxiliary rubber body 59 expands and comes into close contact with the outer peripheral surface of the casing 16.

  According to the third embodiment described above, the auxiliary rubber body 59 that can be swelled is arranged at the front stage of the entrance seal device 10, so that the propulsion of the casing is completed and the water stop material shown in FIG. The following effects are exhibited when 40 is injected. That is, if the water-stopping material is injected after the auxiliary rubber body 59 is inflated, the water-stopping material is blocked by the auxiliary rubber body 59, thereby preventing the water-stopping material from adhering to the lip portion 23 a of the outer seal member 23. it can. As a result, the inner seal member 22 and the outer seal member 23 can be reused. In this reuse, operations such as changing the mounting positions of the inner seal member 22 and the outer seal member 23 and replacing the damaged seal member with a new seal member are performed by attaching the mounting brackets 24a and 24b and the mounting brackets 25a and 25b. Since it is a fitting type by the bolt 26, it can be carried out more easily than a conventional one using an adhesive.

Fourth Embodiment Next, an entrance seal device according to a fourth embodiment of the present invention will be described with reference to FIG.
The fourth embodiment is an embodiment in which a jack device 60 that generates a force necessary for edge cutting when the entrance seal device 10 is removed from the protective concrete 4 after the casing has been propelled is provided.

  After the water-stopping material is backed up, the flange portion 17 of the inner seal case 11 of the entrance seal device 10 and the flange portion 19 of the outer seal case 12 are removed from the wall surface of the protective concrete 4 only by removing the bolts after the cement is solidified. It is often difficult to remove.

  In such a case, it is easy to sequentially remove the outer seal case 12 by generating the edge cutting force with the jack device 60.

Fifth Embodiment FIG. 13 shows an entrance seal device according to a fifth embodiment of the present invention. In FIG. 13, a lower section of the entrance seal device 10 is shown. FIGS. 4, 7, 10, 11, and 12 showing the upper section are the same as the inner seal case 11 and FIG. The outer seal case 12 has an upside down relationship.
In the fifth embodiment, a load bearing joint 70 that supports the radial load of the connecting casing 35 is disposed.
In FIG. 13, the load receiving joint 70 according to the fifth embodiment includes an inner roller bearing 71 and an outer roller bearing 72.

  A bearing support portion 73 is attached to the insertion port side of the inner seal case 11, and a retainer 74 of the inner roller bearing 71 is attached to the bearing support portion 73. In this case, the retainer 74 is fastened using an adjustment bolt 75 and an adjustment nut 76, and is configured to be able to adjust the position by moving the inner roller bearing 71 in the radial direction.

  A retainer 78 is attached to the upper end portion of the support device 77 on the insertion port side of the outer seal case 12, and the outer roller bearing 72 is supported by the retainer 78. In this case, the rod 77a of the support device 77 is configured to be extendable and contractible, and the position of the outer roller bearing 72 can be adjusted in the radial direction by expanding and contracting the rod 77a.

  By providing the load receiving bearing 70 as described above, the following effects can be obtained. That is, in the process of propelling the casings 16 and 35, the weight of the earth and sand or the concrete inside the large-diameter casings 16 and 35 becomes considerable, and the casings 16 and 35 may be difficult to turn.

  Therefore, by providing the load receiving bearing 70 with such a load, the casings 16 and 35 can be smoothly rotated while supporting the load, so that efficient propulsion can be realized.

  When inserting the casing 16 with the cutter bit for the first time, the inner roller bearing 71 is set to a position retracted radially inward from the normal position, and the outer roller bearing 72 is set to have a radius smaller than the normal position. The position is shifted to the outside in the direction, and an interval through which the cutter bit at the tip of the casing 16 can pass without interference is secured. After passing the cutter bit, the positions of the inner roller bearing 71 and the outer roller bearing 72 are fixed at the positions shown in FIG.

  The arrangement position of the load bearing 70 as described above mainly supports the lower part of the casing 16, but in order to prevent eccentricity, a predetermined number of inner roller bearings 71 that support the upper part of the casing are arranged. Also good.

  As mentioned above, although this invention was demonstrated and mentioned with preferable embodiment, in this invention, an inner side sealing member and an outer side sealing member are not limited to embodiment with which a lip | rip part is arranged alternately, respectively, It may be arranged so as to face each other. In addition, the number of steps of the sealing member has been described by taking an example of two inner steps and three outer steps, but the present invention is not limited to this.

It is sectional drawing which shows the underground structure junction part to which the entrance seal apparatus by this invention is applied. It is a front view which shows the protective concrete of the start side tunnel of FIG. The A section enlarged view of FIG. It is a longitudinal cross-sectional view which shows the entrance seal apparatus by 1st Embodiment of this invention. It is a figure which shows the condition which installed the propulsion machine in the start side tunnel. It is a figure which shows the condition which starts the promotion of a casing from a starting side tunnel. It is a longitudinal cross-sectional view which shows the effect | action of the entrance seal apparatus by 1st Embodiment of this invention. It is a figure which shows the promotion progress of a casing. It is a figure which shows the condition which the casing pushed to the arrival side. It is a longitudinal cross-sectional view which shows the entrance seal apparatus by 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the entrance seal apparatus by 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the entrance seal apparatus by 4th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the entrance seal apparatus by 5th Embodiment of this invention. Sectional drawing which shows the example of the underground structure junction part in an up-and-down tunnel road.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Road tunnel 2 Road tunnel 3 Connecting passage 4 Start side protection concrete 5 Arrival side protection concrete 10 Entrance seal apparatus 11 Inner seal case 12 Outer seal case 16 Casing 22 Inner seal member 22a Lip part 23 Outer seal member 23a Lip part 30 Propulsion machine 34 Cutter bit 35 Casing 80 Cooling water pipe / water stopping material injection pipe 82 Cooling water pipe 83 Grease nipple 84 U-shaped pipe

Claims (10)

In order to open a tunnel that connects between the start-side underground structure and the arrival-side underground structure, both the inner and outer peripheral surfaces of the casing that is propelled by the propulsion method are sealed from the protective concrete placed on the start-side underground structure. An entrance seal device,
A cylindrical inner seal case having one end fixed to the protective concrete and having an outer diameter smaller than the inner diameter of the casing;
A cylindrical outer seal case having one end fixed to the protective concrete and having an inner diameter larger than the outer diameter of the casing, so as to be coaxially disposed outside the inner seal case;
A ring-shaped inner seal member detachably fixed to the outer peripheral surface of the inner seal case;
A ring-shaped outer seal member detachably fixed to the inner peripheral surface of the outer seal case;
An entrance seal device comprising:   The entrance according to claim 1, wherein a lip portion on which an inner peripheral surface of the casing slides is formed on an outer peripheral portion of the inner seal member, and the lip portion is inclined in a propulsion direction of the casing. Sealing device.   The entrance according to claim 1, wherein a lip portion on which an outer peripheral surface of the casing slides is formed on an inner peripheral portion of the outer seal member, and the lip portion is inclined in a propulsion direction of the casing. Sealing device.   The entrance seal device according to claim 2 or 3, wherein each of the inner seal member and the outer seal member constitutes a plurality of stages of seals.   5. The entrance seal device according to claim 4, wherein each of the inner seal member and the outer seal member has a staggered arrangement structure in which lip portions alternately intersect with each other.   The entrance seal device according to claim 1, wherein the inner seal member and the outer seal member are respectively attached to the inner seal case and the outer seal case via a fitting type holding frame.   The entrance seal device according to claim 1, wherein an abrasive supply unit is disposed at an inlet portion of the water stop seal device so that an abrasive is applied to the inner and outer peripheral surfaces of the casing.   The entrance seal device according to claim 1, wherein an auxiliary rubber body capable of bulging is disposed in a front stage portion of the water stop seal device.   The entrance seal device according to claim 1, further comprising a jack device that generates a force necessary for edge cutting when the waterproof seal device is removed from the protective concrete.   The entrance seal device according to claim 1, wherein a load receiver that supports a radial load of the casing is provided so that a joint can be moved in a radial direction between the outer seal case and the inner seal case.

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