JP4425293B2 - Pneumatic caisson - Google Patents

Description

  The present invention relates to a shaft used as an underground structure and a pneumatic caisson used for a bridge foundation. In particular, the excavator carried into the work room through the opening provided in the ceiling slab is transferred to the work rail laid on the work room ceiling, or vice versa. In particular, the present invention relates to a pneumatic caisson equipped with a telescopic horizontal moving base for excavator delivery.

  The caisson usually constructs a cylindrical structure on the ground, excavates the earth and sand of the natural ground, and appropriately discharges the earth and sand in the caisson to the ground in a pressurized state, while the caisson itself has its own weight. Subsidized to support ground.

  Such a caisson is constructed such that an excavator is suspended on a work rail provided in a ceiling slab of the work room, and the excavator is operated in an unmanned state to perform excavation work in the work room. Has been.

  In this case, the ceiling slab is formed with an opening provided with a hatch leading to a work room, and a lock device such as a shaft is provided above the opening, through which the excavator is connected from the ground side to the work It is carried into the room.

  The carried excavator is suspended on the side of the work rail laid on the ceiling slab for excavation work. Also, daily inspection, repair, assembly, disassembly work, etc. of the excavator must be performed by an operator entering a working room under pressure.

  Such work under pressure is harsh for workers. Also, sometimes excavation work must be interrupted.

  Therefore, conventionally, a pneumatic caisson 100 as shown in FIG. 18, for example, is provided in order to be able to perform the operation under the above-described pressure under unmanned conditions.

  This conventional pneumatic caisson 100 has a caisson housing 101, and a lower part of the caisson housing 101 is provided with a ceiling slab 103 of a work chamber 105 and a middle slab 104 positioned above the ceiling slab 103, A work chamber 105 is formed below the ceiling slab 103, and a blade edge 102 is provided at the lower part of the peripheral wall of the work chamber 105. A recovery chamber 109 surrounded by the ceiling slab 103, the caisson housing 101, the middle slab 104, and the partition wall 106 is formed, and an elevating chamber 107 and a manlock 108 are also formed.

  The recovery chamber 109 is provided with an excavator recovery device 110. Further, the lifting / lowering chamber 107 is provided with a lifting / lowering device 120. The manlock 108 has airtightness between the ceiling slab 103, the opening 121 communicating with the work chamber 105, and the manlock 108. A man-only hatch 111 for holding is provided. A partition wall 106 is provided between the elevating chamber 107 and the recovery chamber 109 and between the recovery chamber 109 and the manlock 108, and each of them is provided with an opening 112 communicating with each other. Each partition 106 is provided with a hatch 113 for ensuring airtightness.

  When the excavator 114 is recovered in the recovery chamber 109 and inspected / repaired under atmospheric pressure, an operator moves sideways from the lifting / lowering chamber 107 provided beside the recovery chamber 109. The recovery chamber 109 is entered.

  That is, in the case of the conventional pneumatic caisson 100, the subsidence excavation work of the pneumatic caisson work is performed under high atmospheric pressure, and therefore the excavator 114 is remotely operated from the remote operation room 115 on the ground. Measures are taken so that personnel are not exposed to pressure. For daily inspection / repair / assembly / disassembly work of the excavator 114, the excavator 114 is recovered in the recovery chamber 109 by remote control, and the daily inspection of the excavator 114 is performed under atmospheric pressure. . In addition, when a trouble occurs in which the excavator 114 cannot be recovered unintentionally, work under pressure is performed from the manlock 108 adjacent to the side of the lift chamber 107 through the man-dedicated hatch 111 and the opening 121. It is structured to be put in the chamber 105.

In addition, there exists a thing as described in patent document 1 as this kind of thing.
Utility model registration No. 2593847

  However, as can be seen from FIG. 18, the above-described pneumatic caisson 100 is provided with a recovery chamber 109, a manlock 108 and a lift chamber 107 in a so-called side-by-side arrangement in a single-layer space surrounded by the ceiling slab 103 and the middle slab 104. Since the ceiling slab 103 has a large space, when attempting to dispose an automatic moving means on the ceiling slab, a space for the disposition can be easily secured, Although it can be carried out without difficulty, when a small-diameter caisson having a structure having a recovery chamber, a manlock and a lift chamber is to be provided in the same manner, the small-diameter caisson has a small diameter and is narrow. There is a problem that it becomes difficult or impossible to secure a space for arranging the automatic moving means.

  Further, as is clear from FIG. 18, the pneumatic caisson 100 has an opening used for collecting the excavator having a large diameter that allows the excavator with the boom to be turned up and down as it is. This has weak points such as being unfavorable for reducing the diameter of the caisson.

  Therefore, the present invention has been made in view of the above circumstances, and can reduce the burden on the operator, reduce the opening for collection, enable preferable maintenance, and the like. Another object is to provide a new pneumatic caisson.

In order to achieve the above object, according to the first aspect of the present invention, an excavator carried through an opening provided in a ceiling slab of a work room is caused to travel along a work rail installed in the ceiling slab. In a pneumatic caisson configured to perform excavation work and collect the excavator from the work rail through the opening and into a collection chamber formed on the ceiling slab when inspection, repair, etc. are necessary The opening includes a collection stand that can be moved up and down, and a telescopic lateral movement stand that is provided on the collection stand, and the telescopic lateral movement stand is configured to remove the excavator from the work rail. has the ability to traverse the opening, extending from said opening when extended to the position of the working rail, is configured to contract to a length that passes through the opening in the vertical direction during contraction, the telescopic lateral movement rack Wherein with excavator is supported is characterized by having a transfer portion for transferring the excavator to the working rail to.

  According to a second aspect of the present invention, in addition to the configuration according to the first aspect, the work rail is provided with a separation portion in which a part of the rail is removed at a delivery position of the excavator, and the delivery is performed. The insertion portion is inserted into the separation portion, and the connection rail is provided in the insertion portion, supports the excavator, and is continuous with the work rail when the insertion portion is inserted into the separation portion. It is characterized by having.

  The invention described in claim 3 is characterized in that, in addition to the configuration described in claim 1 or 2, the expansion / contraction driving means of the telescopic lateral movement gantry is a jack.

  In addition to the structure in any one of Claims 1 thru | or 3, the invention of Claim 4 is comprised so that the said collection stand may be raised / lowered by the hoisting means.

  According to a fifth aspect of the present invention, in addition to the configuration of the first to fourth aspects, a guide portion is provided on each of the recovery platform side and the ceiling slab side, and these guide portions guide the delivery portion. It was configured as described above.

  The invention according to claim 6 is characterized in that, in addition to the configuration according to claims 1 to 5, the telescopic lateral movement gantry includes a position fixing device for preventing lateral displacement and preventing vertical displacement. To do.

  According to a seventh aspect of the present invention, in addition to the configuration according to the first to sixth aspects, the power supply for supplying power to a driving device for lowering a boom included in the excavator is provided to the delivery unit. The excavator is provided with a power receiving unit that is automatically connected to the power feeding unit when the excavator is transferred to the delivery unit.

According to the present invention, the recovery frame in the opening provided to be vertically movable, and a telescopic lateral movement platform provided on the collecting platform, the telescopic horizontal moving platform, the The excavator has a function of laterally moving from the work rail to the opening, and is configured to extend from the opening to the position of the work rail when extended, and to contract to a length that passes through the opening in the vertical direction when contracted. Since the excavator is supported by the telescopic lateral movement gantry and has a delivery section for transferring the excavator to the work rail, the telescopic lateral movement gantry is brought into a contracted state. If the excavator supported by the delivery unit is configured so as not to hinder the lifting, the excavator and the telescopic lateral movement platform lift and lower the opening in a state integrated with the recovery platform. Because you will be able to The carry working of the excavator, to ensure the recovery operation and the return operation, and safely can be carried out, it can be reduced the burden on the operator.

In addition, since the telescopic lateral movement base is configured to shrink to a length that passes through the opening vertically below the collection base when the contraction is contracted, the diameter of the pneumatic caisson is reduced, the configuration is simplified, and the cost is reduced. Can be reduced.

  In addition, when collected in the collection chamber, there is an advantage that it is possible to maintain substantially the entire telescopic laterally movable frame together with excavator maintenance.

  According to a second aspect of the present invention, the work rail is formed with a separation portion where a part of the rail is removed at a delivery position of the excavator, and the delivery portion is inserted into the separation portion. And a connecting rail that is provided in the insertion portion and supports the excavator and that is continuous with the work rail when the insertion portion is inserted into the separation portion. In addition to the effect of the invention of Item 1, since the telescopic lateral movement base is extended, the work rail is made continuous by inserting the connecting rail into the insertion portion. And the excavator can be reliably delivered between the telescopic lateral movement frame and the excavator can be carried in, recovered, and returned.

  According to the invention of claim 3, since the expansion / contraction drive means of the telescopic lateral movement gantry is a jack, it is possible to reduce the size of the recovery gantry and the telescopic lateral movement gantry and the aperture. The configuration of the entire caisson can be simplified and downsized. In particular, since the telescopic lateral movement stand that is driven by a jack that does not require a large amount of incidental equipment or a complicated configuration is employed, not only can the operation be ensured, but also as shown in FIGS. To enable the provision of a small-diameter caisson with a narrow width suitable for construction of underground structures with a small excavation area, where the recovery chamber, manlock, and lifting / lowering chamber are all arranged vertically. Can do.

  According to the invention of claim 4, the recovery platform is configured to be moved up and down by the hoisting means, so that, in addition to the effects of the inventions of claims 1 to 3, in particular, simplification of the configuration Can be downsized.

  According to the invention of claim 5, guide portions are provided on each of the recovery platform side and the ceiling slab side, and these guide portions are configured to guide the delivery portion. In addition to the effects of the invention, the reliability and reliability of the operation of the telescopic lateral movement gantry can be improved.

  According to the invention of claim 6, the delivery unit is provided with a position fixing device for preventing lateral deviation and preventing vertical deviation, so in addition to the effects of the inventions of claims 1 to 5, When the excavator is delivered, the alignment state of the work rail and the connecting rail can be ensured, and the excavator can be delivered smoothly and reliably.

  According to a seventh aspect of the present invention, the delivery unit is provided with a power supply unit that supplies electric power to a boom drive device of the excavator, and the excavator is provided with the delivery unit. In addition to the effects of the inventions of claims 1 to 6, in addition to the effects of the inventions of claims 1 to 6, the process of moving from the work rail of the excavator to the collection stand and the collection are provided. During the process of returning from the gantry to the work rail, the boom drive device is in a power-receivable state, so the direction and shape of the boom can be arbitrarily changed during these processes. Therefore, it is possible to efficiently make the excavator supported by the delivery section have a configuration that does not hinder the raising and lowering. That is, as described above, the opening portion can be moved up and down in a state in which the excavator and the telescopic lateral movement mount are integrated with the recovery mount. In addition, since the state of power reception is maintained until the excavator leaves the work rail and returns, the shape can be changed during the movement, and not only can the loss of time be reduced, but also the boom Since the shape of the excavator can be easily passed through the opening by changing the form, there is an advantage that the opening can be made as small as possible, which is suitable for the configuration of the small-diameter caisson. It is.

  Embodiment 1 of the Invention

  Embodiment 1 of the present invention will be described below.

  1 to 11 show Embodiment 1 of the present invention.

  The configuration of Embodiment 1 of the present invention will be briefly described. As shown in FIGS. 1 and 2, the caisson housing A has a caisson housing A having a work room D partitioned by a ceiling slab B on the lower side. Has a triple slab structure including the ceiling slab B, a middle slab C provided on the ceiling slab B, and an upper slab K provided on the middle slab C. A space between the ceiling slab B and the middle slab C is a collection chamber E, and a space between the middle slab C and the upper slab K is a manlock F. Further, a material shaft 11 that passes through the upper slab K and the middle slab C and connects to the recovery chamber E, and a lifting shaft 10 that passes through the upper slab K and connects to the manlock F are provided. Further, a hatch 9 is provided at the lower end of the lifting shaft 10, a man hatch 8 is provided in the manlock F, and a recovery hatch 2 having a split hatch 1 is provided in the recovery chamber E. It has been.

  The ceiling slab B is provided with an opening L through which the excavator G passes and a work rail 4 on which the excavator G travels, and the middle slab C is opened when the recovery hatch 2 is opened. A hoisting device 19 is provided for hoisting the collection platform 3 in a state where the excavator G is fixed.

  The opening L is provided with the recovery platform 3 for lifting the excavator G and the recovery hatch 2, and the collection platform 3 and the opening L are provided with a hook portion 17 and a receiving portion 18. . The hanging portion 17 engages with the receiving portion 18 when the collection frame 3 is lowered, and maintains the collection frame 3 in a suspended state. Therefore, the hanging portion 17 and the receiving portion 18 function as a positioning portion that maintains the height of the collection rack 3 at a predetermined height position.

  Further, on the lower surface of the recovery platform 3, a telescopic lateral movement that performs a function of moving the excavator G from the work rail 4 to the opening L and a function of returning from the opening L to the work rail 4. A gantry 14 is provided. The telescopic lateral movement mount 14 is provided with a three-stage telescopic drive jack 6 that is laterally expanded and contracted, and a transfer portion 14a is connected to the moving end of the telescopic drive jack 6 through a joint portion 14b. (See FIG. 9 etc.). Here, although not shown, they are attached by bolts or the like. The expansion / contraction driving jack 6 functions as expansion / contraction driving means for the telescopic lateral movement gantry 14 and contracts the telescopic lateral movement gantry 14 to a length that can pass through the opening L.

  As described above, since the extension drive jack 6 is used as the extension drive means of the extension / contraction type lateral movement base 14, the collection base 3 and the extension / conversion type lateral movement base 14 can be miniaturized, and the configuration of the entire caisson is simplified. And downsizing. In particular, since the telescopic lateral movement base 14 driven by the jack 6 that does not require a large amount of incidental equipment or complicated configuration is adopted, the collection chamber E and the manlock F are installed in a vertical state. It is possible to provide a small-diameter caisson having a narrow width suitable for construction of an underground structure having a small excavation area.

  Further, the telescopic lateral movement base 14 is provided with a series of lateral movement guide means 5 provided on the recovery base 3 and the ceiling slab B. This lateral movement guide means 5 is capable of crossing the telescopic lateral movement gantry 14 when the collection gantry 3 is in a position suspended on the positioning part in the middle of the collection gantry 3. It is composed of a pair of guide rails 5b and 5c provided with a transition portion 5a that enables the elevator to move up and down.

  Therefore, according to the guide means 5 for lateral movement, the reliability and reliability of the operation of the telescopic lateral movement gantry 14 can be improved.

  Further, the work rail 4 is formed with a separation portion 4b in which a part of the rail 4 is removed at the delivery position of the excavator G. The delivery portion 14a is inserted into the separation portion 4b by extension of the jack 6. A connecting rail 4a that is continuous with the work rail 4 by being inserted into the separating portion 4b is provided on the lower surface of the delivery portion 14a.

  That is, when the telescopic lateral movement base 14 is extended, the work rail 4 is made continuous by inserting the connecting rail 4a into the separation portion 4b. The delivery of the excavator G can be ensured between the telescopic lateral movement mounts 14, and the work of carrying in, collecting and returning the excavator G can be simplified.

  The telescopic lateral movement gantry 14 is provided with a fixing jack 20 that functions as a position fixing device for preventing lateral displacement and preventing vertical displacement. Therefore, when the excavator G is delivered, the alignment state of the work rail 4 and the connecting rail 4a can be ensured, and the excavator can be delivered smoothly and reliably.

  According to the first embodiment, when subsidence excavation work is performed, the two-way hatch 1 of the recovery hatch 2 is opened, and a bucket (not shown) loaded with earth and sand by the excavator G is a material lock 12. It is carried out through. At this time, the collection chamber E is filled with high atmospheric pressure.

  When the excavator G is inspected and repaired, the split hatch 1 of the recovery hatch 2 is opened and the excavator G is recovered in the recovery chamber E. After the recovery, the split hatch 1 of the recovery hatch 2 is closed, and the inside of the recovery chamber E is returned to atmospheric pressure.

  Then, the worker enters the manlock F by the lifting shaft 10. Open the hatch 7 of the man hatch 8 in the manlock F and get down into the collection chamber E. The operation can be performed under atmospheric pressure.

  When the inspection and repair work for the excavator G is completed, the worker moves to the manlock F and closes the hatch 7 of the man hatch 8. Next, it goes up to the ground by the lifting shaft 10.

  If the excavator G fails in the work chamber D and cannot move and cannot be recovered in the recovery chamber E, the excavator G is repaired in the following manner.

  In this case, the hatch 1 of the recovery hatch 2 is open, and the inside of the recovery chamber E is also under high pressure. The hatch 7 of the man-only hatch 8 is closed, and the inside of the manlock F is at atmospheric pressure.

  First, the worker descends with the lifting shaft 10 and moves into the manlock F. The hatch 9 below the lifting shaft 10 is closed to pressurize the inside of the manlock F.

  When the same pressure as that in the collection chamber E is reached, the hatch 7 of the man-only hatch 8 is opened and descends into the collection chamber E.

  Subsequently, the worker descends the excavator G from the maintenance hatch 2 for recovery into the work room D. After the excavator G is inspected and repaired in the work chamber D, the worker returns to the recovery chamber E and then returns to the manlock F.

  After that, the hatch 7 of the man-only hatch 8 is closed, the pressure inside the manlock F is reduced, and the inside is returned to the atmospheric pressure. After completion of the decompression, the hatch 9 is opened and the elevator shaft 10 is moved up to the ground.

  In the case of large exploration, a mixed gas supply facility (not shown) and a pure oxygen supply facility (not shown) are provided in the manlock F, and the excavator G is inspected and repaired while breathing the mixed gas. And depressurize using pure oxygen.

  3A to 3H show a procedure for collecting the excavator G. FIG.

  (a) is a state in which the split hatch 1 of the recovery hatch 2 is opened, and the recovery chamber E and the working chamber D are brought to the same pressure state. After being wound up, it is moved to a position retracted from the bucket movement range, and the opening L is opened. Then, a state is shown in which the excavator G is moved along the work rail 4 attached to the lower portion of the ceiling slab B while electricity is supplied from the power supply by the power feeding device 15.

  (b) shows a state in which the collection stand 3 is suspended by the hoisting device 19 and the hooking portion 17 of the collection stand 3 is locked to the receiving portion 18 provided in the opening L.

  (c) The extension part 14a of the extendable laterally movable carriage 14 is moved to the work rail 4 side by extending the extension drive jack 6, and the excavator is connected to the connecting rail 4a attached to the lower part of the delivery part 14a. The state where G has changed is shown.

  (d) shows that the power feeding device 15 for supplying power to the excavator G provided on the work rail side is disconnected from the left power receiving device 15a provided on the left side of the excavator G, and The telescopic lateral movement platform 14 provided is contracted by the telescopic drive jack 6, and the transfer section 14 a in a state where the excavator G is suspended is moved to the opening L of the ceiling slab B, and the excavator G The right side power receiving device 16a provided on the right side of FIG. 2 is joined to the power supply device 16 for supplying power to the excavator G provided on the recovery platform 3.

  (e) shows a state in which the recovery platform 3 is lifted from the working chamber D to the recovery chamber E side by the hoisting device 19 while changing the posture of the excavator G. In this case, the telescopic lateral movement gantry 14 is moved to the collection chamber E side together with the collection gantry 3. Moreover, since the collection platform 3 is moved up and down by the hoisting device 19 in this way, the configuration can be simplified and the size can be reduced.

  (f) shows the state in which the telescopic lateral movement base 14 and the recovery base 3 on which the excavator G is suspended are lifted in the recovery chamber E by the hoisting device 19.

  (g) shows the state in which the excavator G and the telescopic lateral movement gantry 14 are in a maintenance-possible posture in the collection chamber E.

  (h) shows a state in which the interior of the recovery chamber E is brought to atmospheric pressure by closing the split hatch 1 of the recovery hatch 2 and exhausting the recovery chamber E under reduced pressure.

  4 to 7 show a state in which the excavator G is positioned on the opening L side by the delivery portion 14a of the telescopic lateral movement gantry 14.

  The collection gantry 3 is suspended by a hooking portion 17 of the collection gantry 3 engaged with a receiving portion 18 installed in the opening L of the ceiling slab B. At the lower part of the collection stand 3, an expansion / contraction type lateral movement stand 14 having a telescopic drive jack 6 that expands and contracts in a multistage manner, a delivery section 14 a and a connecting rail 4 a is attached. The telescopic lateral movement gantry 14 is suspended by guide rails 5b and 5c provided on the lower surface of the recovery gantry 3 and the ceiling slab B. The excavator G is suspended by the connecting rail 4a. Further, the extension jack 20 is contracted before the telescopic lateral movement base 14 is extended, and the fixing of the telescopic lateral movement base 14 and the recovery base 3 is released. Further, power is supplied to the excavator G through the right power receiving device 16a by a power supply device 16 attached to the collection platform 3 side.

  That is, after the fixing jack 20 is shrunk and the fixing of the telescopic lateral movement base 14 and the recovery base 3 is released, the extension driving jack 6 is extended to be attached to the side surface of the delivery portion 14a. The laterally moving wheel 21 is rotated, and the excavator G suspended on the connecting rail 4a attached to the lower portion of the delivery portion 14a is moved to the work rail 4 side of the ceiling slab B. Further, the right power supply device 16a is disconnected from the power supply device 16 attached to the collection frame 3 side by the movement of the telescopic lateral movement frame 14, and the supply of power is cut off. In addition, the attachment direction of the power feeding device 16 attached to the collection rack 3 may be either the horizontal direction or the vertical direction.

  8 to 11 show a situation in which the excavator G is positioned on the work rail 4 side by the delivery unit 14a of the telescopic lateral movement gantry 14.

  The delivery portion 14a on which the excavator G moved to the work rail 4 side is suspended is fixed to the concave portion of the ceiling slab B by extending the fixing jack 20 so as not to move laterally, and for guidance. The rail 5c prevents the vertical movement. Thereby, the connection rail 4a and the work rail 4 will be in an alignment state. Further, the left power receiving device 15a on the telescopic lateral movement base 14 side and the power feeding device 15 on the ceiling slab B side are connected to start power supply to the excavator G, and the excavator G can be operated.

  [Embodiment 2 of the Invention]

  The second embodiment of the present invention will be described below.

  12 and 13 show a second embodiment of the present invention.

  Since the configuration of the second embodiment of the present invention is basically substantially the same as that of the first embodiment, the drawings and detailed description as a whole are omitted here, and particularly different points are shown in FIG. This is illustrated by FIG.

  In short, the second embodiment is different from the first embodiment in that two extension drive jacks 6a and 6b are used.

  Embodiment 3 of the Invention

  The third embodiment of the present invention will be described below.

  14 to 17 show a third embodiment of the present invention.

  Since the configuration of the third embodiment of the present invention is basically substantially the same as that of the first embodiment, the detailed description thereof will be omitted, with the same reference numerals given to the same parts. The part will be described below.

  While the first embodiment described above uses one extension drive jack 6 and four laterally moving wheels 21 as extension drive means, this embodiment 3 includes two extension drive jacks 6a, 6b is used, and the laterally moving wheel 21 is omitted. This omission can simplify assembly, simplify the configuration, and reduce costs. Moreover, the point which devised the following as an electric power supply with respect to the drive device (not shown) of the boom which the excavator G has differs from Embodiment 1 or 2.

  In the third embodiment of the present invention, a power feeding unit 22 that supplies power to a boom driving device of the excavator G is provided in the delivery unit 14a. The power feeding unit 22 is configured to be automatically connected to the right power receiving unit 16a when the excavator G is transferred to the delivery unit 14a.

  That is, according to the third embodiment of the present invention, the telescopic lateral movement base 14 provided at the lower part of the recovery base 3 is extended by the extension drive jacks 6a and 6b, and the connecting rail 4a is continuous with the work rail 4. When the excavator G is transferred from the work rail 4 to the delivery unit 14a in a state where the excavator G is, the right power receiving device 16a provided in the excavator G is automatically connected to the power supply unit 22 by the transfer. And, the excavator G is moved to the opening L with the automatic connection by the contraction of the telescopic lateral movement base 14 by the telescopic drive jacks 6a and 6b.

  Therefore, the excavator G and the telescopic lateral movement gantry 14 can move the opening L up and down in an integrated state with the collection gantry 3. In addition, since the state of receiving power from the power supply unit 22 is maintained until the excavator G leaves the work rail and returns, it is possible to change the form during the movement, and only to reduce time loss. First, the shape of the excavator can be easily passed through the opening by changing the form of the boom. As a result, the opening can be made as small as possible, and the caisson can be reduced in diameter.

  In the above embodiments, the extension drive jack is used as the extension drive means in each of the above embodiments. However, the invention is not limited to this, and the extension drive means such as a screw shaft or pantograph may be used. In addition, although a fixing jack is used as a position fixing device for the telescopic lateral movement gantry, the present invention is not limited to this. For example, an electromagnetic locking device or a mechanical automatic locking device may be used. In each of the above embodiments, the expansion / contraction driving jack 6 and the delivery portion 14a are joined by a bolt or the like (not shown). However, the joining portion 14b can be freely separated and joined by a gripping device such as a magnet. It may be configured. Thereby, in the excavation state by the excavator G, the extension drive jack 6 is shortened while the delivery portion 14a is separated from the extension drive jack 6 and left at the delivery position, and the collection platform 3 is moved upward from the opening L. Move and retreat from the passing range of the bucket. As a result, since the delivery part 14a remains in the delivery position, the continuous state (annular state) between the connecting rail 4a of the delivery part 14a and the work rail 4 can be maintained. 4 can be moved in an annular range. Therefore, in this excavation state, compared to the case where there is no connection rail 4a and only the work rail 4 is present, only the work rail 4 is in a state in which the portion of the connection rail 4a is cut out. Since the excavator G is moved only on the work rail 4 due to the shape of the letter, the work efficiency is poor for excavating the position corresponding to the notched portion, whereas the excavator G is excavated. By enabling the machine G to have an annular range along the rails 4a and 4, excavation work efficiency by the excavator G can be improved. Further, when the excavator G is to be recovered, it can be recovered by setting the recovery platform 3 in the opening L, extending the extension drive jack 6 and connecting it to the delivery portion 14a by, for example, a magnet.

1 is a schematic diagram showing a first embodiment. It is an enlarged view which shows the working chamber part of the same Embodiment 1. FIG. It is explanatory drawing which shows the collection | recovery procedure by the same Embodiment 1. It is a top view which shows the principal part of the same Embodiment 1 in the state in which the delivery part was located in the opening part side. FIG. 4 is a sectional view taken along line 4A-A in FIG. It is sectional drawing which follows the same FIG. 4B-B line. It is sectional drawing which follows the same FIG. 4C-C line. It is a top view which shows the said principal part of the same Embodiment 1 in the state in which the delivery part was located in the work rail side. FIG. 9 is a cross-sectional view taken along the line D-D in FIG. 8. FIG. 9 is a cross-sectional view taken along the line E-E in FIG. 8. It is sectional drawing which follows the same FIG. 8F-F line. It is a top view which shows the principal part of Embodiment 2 in the state in which the delivery part was located in the opening part side. It is a top view which shows the said principal part of the same Embodiment 2 in the state in which the delivery part was located in the work rail side. FIG. 6 is a schematic diagram showing a third embodiment. It is an enlarged view which shows the working chamber part of the same Embodiment 3. It is sectional drawing which follows the same FIG. 15G-G line. FIG. 15 is a sectional view taken along line 15H-H in FIG. It is the schematic which shows a prior art example.

Explanation of symbols

B: Ceiling slab D: Work room E: Collection room F: Manlock G: Excavator L: Opening part 3: Collection stand 4: Work rail 4a: Connecting rail 6, 6a, 6b: Telescopic drive jack 14: Telescopic type Horizontally moving mount 14a: Delivery unit 15, 16, 22: Power supply device (power supply unit)
19: Hoisting device (winding means)
20: Jack for fixing

Claims (7)

The excavator carried through the opening provided in the ceiling slab of the work room runs along the work rail installed in the ceiling slab to perform excavation work. In a pneumatic caisson configured to recover from the work rail through the opening into a recovery chamber formed on the ceiling slab,
The opening has a collection stand that can be moved up and down, and an extendable lateral movement stand that is provided on the collection stand, and the extendable horizontal transfer stand opens the excavator from the work rail to the opening. It has a function of laterally moving to a part, and is configured to extend from the opening to the position of the work rail when extended, and to shrink to a length that passes through the opening in the vertical direction when contracted. A pneumatic caisson characterized in that the excavator is supported and has a delivery section for transferring the excavator to the work rail.   The work rail is formed with a separation part from which a part of the rail is removed at a delivery position of the excavator, and the delivery part is provided in the insertion part and an insertion part inserted into the separation part. 2. The apparatus according to claim 1, further comprising a connecting rail that supports the excavator and that is made continuous with the work rail when the insertion portion is inserted into the separation portion. Pneumatic caisson.   The pneumatic caisson according to claim 1 or 2, wherein the expansion / contraction drive means of the telescopic lateral movement gantry is a jack.   The pneumatic caisson according to any one of claims 1 to 3, wherein the recovery platform is configured to be moved up and down by a hoisting means.   The guide part is provided in each of the said collection stand side and the said ceiling slab side, These guide parts are comprised so that the said delivery part may be guided, It is any one of Claim 1 thru | or 4 characterized by the above-mentioned. Pneumatic caisson.   The pneumatic caisson according to any one of claims 1 to 5, wherein the delivery unit includes a position fixing device for preventing lateral displacement and preventing vertical displacement.   The delivery unit is provided with a power supply unit that supplies electric power to a boom driving device included in the excavator, and the excavator is transferred to the delivery unit to transfer the power. The pneumatic caisson according to claim 1, further comprising a power receiving unit that is automatically connected to the unit.

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