JP2006233585A - Intra-pipe sediment excavating/discharging device and intra-pipe sediment excavating/discharging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform intra-pipe soil removing work in a short time. <P>SOLUTION: This intra-pipe sediment excavating/discharging device is provided with an excavating injection nozzle for excavating sediment in a pipe such as a steel pipe pile built in the ground with jet water; a muddy water discharge body for discharging the sediment excavated by the excavating injection nozzle in a muddy water state to the ground; and a support body for supporting the muddy water discharge body and the excavating injection nozzle. Intra-pipe soil removing work can thereby be efficiently performed in a short time. As a result, a construction period can be shortened, and a construction cost can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an in-pipe sediment excavation / discharge device and an in-pipe sediment excavation / discharge method.

Conventionally, as one form of civil engineering work, a steel pipe pile has been built as part of the foundation of the ground, etc., and an excavation method that discharges while excavating the sediment in the steel pipe pile has been adopted. , Using a pipe excavator equipped with a water jet that excavates the soil in the pipe using jet water and an underwater sand pump that discharges the earth and sand excavated by the water jet to the ground in a muddy state. Some have been made (see, for example, Patent Document 1).
JP 2003-20888 A

  However, in the above-mentioned pipe excavation apparatus, since it takes time to suspend a relatively heavy underwater sand pump in a steel pipe pile and perform the earth removal work, when excavating a large number of pipes, There is a problem that the construction period and the construction cost increase due to the great effort.

  In addition, when placing concrete for consolidation or filling in the steel pipe pile that has been excavated, the submersible sand pump must be pulled up to the ground, and then concrete must be placed through the tremey pipe in the pipe. In addition, this work takes time and causes the construction period and cost to rise.

  Therefore, in the present invention, an excavation nozzle for excavating earth and sand in a pipe such as a steel pipe pile built in the ground with jet water, and the earth and sand excavated by the jet nozzle for excavation are discharged to the ground in a muddy state. The present invention provides an in-pipe sediment excavation / discharge device characterized by comprising a mud discharger and a support that supports the mud discharger and the excavation jet nozzle.

The present invention is also characterized by the following configuration.
(1) The muddy drainage body includes a cylindrical discharge piece extending in the vertical direction, and a branch discharge piece extending in a plurality of branches from the lower end portion of the discharge book piece toward the outside and downward. The branch base of the branch discharge piece is provided with a discharge promotion spray nozzle that sprays spray water and / or compressed air upward in the discharge main piece to promote muddy water discharge.
(2) Providing a propelling / cleaning spray nozzle that ejects spray water and / or compressed air toward the upper outer side to propel the support downward and cleans the inner peripheral surface of the pipe.
(3) In pipes such as steel pipe piles, concrete can be supplied from the ground through a muddy drainage body.

  Further, in the present invention, the sediment in the pipe such as the steel pipe pile is excavated with the jet water by the in-pipe sediment excavation / discharge device according to claim 4, and the excavated sediment is discharged to the ground in the muddy state, and the inside of the pipe is predetermined. When excavating to the depth of the pipe, pulling up the above-mentioned sediment drilling / discharging device in the pipe upward, supplying a predetermined amount of concrete for consolidation from the ground to the lower part of the pipe through the mud drainage provided in the sediment excavating / discharging device in the pipe It provides a method for excavating and discharging sediment in the pipe.

(1) In the present invention described in claim 1, the in-pipe sediment excavation / discharge device includes an excavation injection nozzle for excavating sediment in the pipe such as a steel pipe pile built in the ground with jet water, and the excavation injection nozzle The mud drainage body which discharges the earth and sand excavated by the above in the muddy state to the ground, and a support body which supports the mud drainage body and the excavation jet nozzle.

In this way, the earth and sand in a pipe such as a steel pipe pile built in the ground is excavated with the jet water jetted from the excavation injection nozzle, and the earth and sand excavated by the excavation jet nozzle is taken up by the muddy water discharger. Since it can discharge | emit while sucking in a muddy water state, the earth removal construction in a pipe can be performed efficiently in a short time. As a result, the construction period and cost can be reduced.
(2) In the present invention according to claim 2, the muddy water discharger extends in a plurality of branches, extending in the vertical direction, and a cylindrical discharge book piece extending outward and downward from the lower end of the discharge book piece. A branch discharge piece, and at the branch base of the branch discharge piece, there is provided a discharge promotion spray nozzle for injecting spray water and / or compressed air upward in the discharge main piece to promote muddy water discharge. Provided.

In this way, by providing a discharge assisting injection nozzle at the branch base of the branch discharge piece, and spraying water and / or compressed air upward from the discharge promotion injection nozzle, Therefore, the muddy water sucked from each branch discharge piece can be promoted as a smooth flow to be discharged through the discharge main piece. Can be done efficiently in time. As a result, the construction period and cost can be reduced.
(3) In the present invention as set forth in claim 3, the in-pipe sediment excavation / discharge device propels the supporting body downward by ejecting jet water outwardly and propelling / cleaning the inner peripheral surface of the pipe. A cleaning spray nozzle is provided.

In this way, jetting water is jetted outward and upward by the propulsion / cleaning jet nozzle to propel the support downward, and the inner peripheral surface of the pipe can be washed, so that excavation work and pipe cleaning Work can be performed smoothly and reliably at the same time.
(4) In the present invention according to claim 4, concrete can be supplied into the pipe such as a steel pipe pile from the ground through a muddy drainage body.

In this way, concrete for filling or filling can be supplied from the ground through the muddy drainage body, so there is a need to perform a work such as inserting a tremy pipe into the pipe and supplying the concrete. Therefore, it is possible to continuously and efficiently perform the soil removal work and the consolidation work or the column construction work.
(5) In the present invention described in claim 5, as the in-pipe sediment excavation / discharge method, the sediment in the pipe such as a steel pipe pile is excavated with jet water by the in-pipe soil excavation / discharge device of (4), and the excavated sediment When the inside of the pipe is excavated to a predetermined depth, the above-mentioned soil excavation / exhaust device is lifted upward, and the mud drainage body provided in the in-pipe soil excavation / exhaust device is pulled from the ground. A predetermined amount of concrete is supplied into the pipe.

  In this way, when the in-pipe soil excavation / discharge device is dug to a predetermined depth, the muddy water in which a predetermined amount of concrete for solidification or filling is continuously provided from the ground to the in-pipe soil excavation / discharge device. By supplying it through the discharge body, it is possible to firmly solidify the lower part of the pipe or to build the column with the same concrete, and also after the specified amount of concrete has been supplied, the soil excavation and discharge device in the pipe remains as it is. If it is gradually pulled up, the required work can be completed in one step.

  As a result, it is possible to carry out the soil removal work and the consolidation work or the column construction work continuously and efficiently. From this point of view, the construction period and the construction cost can be reduced.

  Hereinafter, the best embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory diagram of a work process in which a soil excavation work and a rooting work (or filling work) are performed using the in-pipe sediment excavation / discharge device A according to the first embodiment of the present invention, FIG. Is a cross-sectional front explanatory view of the above-mentioned pipe excavation and excavation device A, FIG. 3 is an explanatory plan view of the pipe internal sediment excavation and discharge device A, and FIG. FIG. 5 is a cross-sectional plan view of the in-pipe sediment excavation / discharge device A, and FIG. 6 is a cross-sectional bottom view of the in-pipe sediment excavation / discharge device A.

First, the configuration of the in-pipe sediment excavation / discharge device A according to the first embodiment will be described, and then the in-pipe sediment excavation / discharge method performed using the in-pipe soil excavation / discharge device A will be described.
[Description of Sediment Excavation / Discharge Device A in Pipe as First Embodiment]
As shown in FIG. 1 to FIG. 6, the in-pipe sediment excavation / discharge device A as the first embodiment connects the suspension wire 3 to the upper end portion of the support body 1 formed in a hollow box shape via the connection body 2. On the other hand, upper and lower ring-shaped pipes 4 and 5 formed in a ring shape along the inner peripheral surface of the support body 1 are arranged close to the upper and lower stages at the lower end portion of the support body 1. -The lower ring-shaped pipes 4 and 5 are connected to the lower ends of the upper and lower water supply pipes 6 and 7 extending vertically.

  Here, the support 1 includes a cylindrical peripheral wall portion 1a extending in the vertical direction, a ceiling portion 1b extending from the upper end portion of the peripheral wall portion 1a, and a bottom portion 1c extending from the lower end portion of the peripheral wall portion 1a. The outer wall 1a is formed in a hollow box shape with an outer diameter of approximately half the inner diameter of the pipe B such as a steel pipe pile, and the support 1 is moved up and down in the pipe B. To be able to.

  The upper ring-shaped pipe 4 is arranged along the week surface at the lower end of the peripheral wall 1a of the support 1, and the upper ring-shaped pipe 4 includes a plurality of (mains) at regular intervals in the circumferential direction. In the embodiment, six propulsion / cleaning injection nozzles 8 are connected to communicate with each other so as to be directed outward and upward. Reference numeral 27 denotes an injection hole formed in the peripheral wall portion 1a corresponding to each propulsion / cleaning injection nozzle 8.

  The upper ring-shaped pipe 4 is connected with the lower end of the upper water supply pipe 6 penetrating from the top to the ceiling 1b of the support 1, and is connected to the tip of the upper water supply pipe 6 for the upper part. While connecting the front-end | tip part of the water supply pipe | tube 9, the base end part of the water supply pipe | tube 9 for the upper part is connected to the water supply pump (not shown) as a water source arrange | positioned on the ground.

  In this way, by supplying cleaning water from the water supply pump to the upper water supply pipe 9 → the upper water supply pipe 6 → the upper ring-shaped pipe 4, the upper and outer sides of each propulsion / cleaning injection nozzle 8 pass through the respective injection holes 27. The jet water W is ejected toward the upper side, the support 1 is pushed downward by the jet water W, and the mud adhering to the inner peripheral surface of the pipe B can be washed.

  Here, the propulsion / cleaning injection nozzle 8 may eject compressed air instead of the injection water W according to the present embodiment, or may be a mixture of bubbles mixed with the injection water W and compressed air. Water can also be ejected, and either can be adopted as appropriate according to the operating conditions such as soil quality.

  The lower ring-shaped pipe 5 is arranged along the week surface at the lower end of the peripheral wall 1a of the support 1, and the lower ring-shaped pipe 5 includes a plurality of (mains) at regular intervals in the circumferential direction. In the embodiment, six nozzles 11 for excavation are directed downward to communicate with each other, and the water supply arm pipe 26 is extended from the lower ring-shaped pipe 5 to the center position of the lower ring-shaped pipe 5. The excavation spray nozzle 11 is directed downwardly and connected to the tip of the water supply arm pipe 26 in a downward direction. Reference numerals 18 denote injection holes formed in the peripheral portion and the central portion of the bottom portion 1c that coincide with the excavation injection nozzle 11, respectively.

  The lower ring pipe 5 is connected to the lower end of the lower water supply pipe 7 through the ceiling 1b of the support 1 from above and connected to the tip of the lower water supply pipe 7 for the lower part. The front end of the water supply pipe 12 is connected, and the base end of the lower water supply pipe 12 is connected to a water supply pump (not shown) as a water source disposed on the ground.

  In this way, by supplying cleaning water from the feed pump to the lower ring-shaped pipe 5 through the lower feed pipe 12, the jet water W is ejected downward from the excavation jet nozzles 11 through the jet holes 18. Thus, the earth and sand g of the ground G located directly below the support 1 can be excavated.

  Further, a muddy water discharger 13 is disposed in the support 1, and the muddy water discharger 13 is formed from a cylindrical discharge main piece 13a extending in the vertical direction and a lower end portion of the discharge main piece 13a. It is formed from branch discharge pieces 13b, 13b that branch and extend outwardly and downward (two in this embodiment), and the upper end portion 13c of the discharge main piece 13a is above the ceiling portion 1b of the support 1 The top end portion 19a of the guide tube 19 extending from the ground is connected to the upper end portion 13c in a communicating manner, and the lower end portions of the branch discharge pieces 13b and 13b are opened downward from the bottom portion 1c of the support 1. Thus, muddy water intake ports 20 and 20 are formed.

  Further, a discharge promoting injection nozzle 14 is connected to the branch base of the branch discharge pieces 13b, 13b. The discharge promoting injection nozzle 14 is branched from the front end of the upper water supply pipe 6 and is formed below. The tip end portion of the branch water supply pipe 15 formed by extending to is communicated.

  In addition, the discharge assisting injection nozzle 14 is connected to the ceiling 1b of the support body 1 through the top end of the air supply pipe 24 from above, and the air supply pipe 24 is arranged on the ground. It is connected to a compressor (not shown) as an air source.

  In this manner, the discharge promoting water is supplied from the feed water pump to the discharge promoting injection nozzle 14 through the upper feed water pipe 9 and the branch water supply pipe 15, and the compressed air is supplied from the compressor to the discharge promoting injection nozzle 14 through the air supply pipe 24. By discharging the spray water Wa, which is a mixture of discharge assist water and compressed air, from the discharge facilitating spray nozzle 14 upward in the discharge main piece 13a, the same discharge is performed. It facilitates the discharge of mud excavated earth and sand (hereinafter abbreviated as “muddy water”) discharged upward through the main piece 13a so that the soil can be discharged smoothly.

  At this time, by sucking the air in the mud discharge body 13 from the ground through the guide pipe 19 (air lift), the muddy water is taken in from the muddy water intake ports 20 and 20 of the branch discharge pieces 13b and 13b, and discharged from each branch. The muddy water can be discharged to the ground through each of the pieces 13b, 13b → the discharge main piece 13a → the guide pipe 19, and the muddy water has a relatively large diameter through each branch discharge piece 13b having a relatively small diameter. At the time of merging at the lower end of the main drainage piece 13a, the rising flow velocity is decelerated, but at the merging point, in other words, at the branching portion of the branch discharge pieces 13b, 13b, the discharge promoting injection nozzle 14 Since the jet water Wa mixed with bubbles is jetted upward from the muffle water, the muddy water smoothly joins the branch discharge pieces 13b and 13b to the discharge main piece 13a and is quickly discharged. a is a muddy water inflow direction, and b is an injection direction of the jet water Wa mixed with bubbles.

  Here, from the discharge facilitating spray nozzle 14, the spray water W can be sprayed instead of the bubble-mixed spray water Wa according to the present embodiment, or the compressed air can be sprayed. Any one of them can be adopted as appropriate according to the operating conditions.

  In addition, it is possible to supply concrete C for root consolidation or filling from the ground through the guide pipe 19 into the muddy water discharger 13.

  In this way, since the concrete C for root consolidation can be supplied from the ground through the muddy drainage 13, it is necessary to perform an operation such as separately supplying the concrete C by inserting the space between the tremies into the pipe. Therefore, it is possible to perform the soil removal work, the consolidation work or the filling work continuously and efficiently in one process.

  Here, an opening / closing valve body 25 is disposed immediately above the discharge facilitating injection nozzle 14, and the opening / closing valve body 25 is provided at the base of the branch discharge pieces 13b, 13b with a pair of left and right opening / closing valve forming pieces 25a. , 25a is pivotally supported, and the posture can be freely changed between an open state in which the distal end portions of both opening / closing valve forming pieces 25a, 25a are separated from each other and a closed state in which the distal end portions are in contact with each other.

  Moreover, the opening / closing valve forming pieces 25a, 25a of the opening / closing valve body 25 are elastically biased so as to be held closed by an elastic means (not shown) such as a coil spring, and bubbles are mixed from the discharge promoting injection nozzle 14. When the jet water Wa is jetted upward, the on-off valve forming pieces 25a, 25a are opened against the elastic biasing force of the elastic means.

Therefore, when the concrete C is supplied from the ground through the muddy water discharger 13, the on-off valve forming pieces 25a, 25a of the on-off valve body 25 are held closed by elastic means such as a coil spring. It is possible to prevent the occurrence of a problem that C flows into and solidifies into the discharge promoting injection nozzle 14 and closes the nozzle hole.
[Explanation of soil excavation and discharge method in pipe]
Next, a construction method for excavating and discharging sediment in the pipe B using the in-pipe sediment excavating and discharging apparatus A as the first embodiment will be described with reference to FIG.

That is, the in-pipe sediment excavation / discharge method according to the present invention is a construction method that is carried out after the medium digging / press-in construction as shown in FIG. 1, and first shown in FIGS. 1 (a) to (d). The medium digging and press-fitting work will be described, and then the in-pipe soil excavation and discharge method shown in FIGS. 1 (e) to (h) will be described.
(Explanation of medium digging and press fitting)
(1) As shown in FIG. 1 (a), the pipe B is press-fitted while discharging the earth and sand g of the ground G with the auger screw D.
(2) As shown in FIG. 1 (b), the earth and sand g of the ground G is continuously discharged by the auger screw D and the pipe B is press-fitted, so that the pipe B is fitted into a support layer such as the soft rock layer E. Install.
(3) Pull out the auger screw D as shown in FIG.
(4) As shown in FIG. 1 (d), the auger screw D is completely pulled out to complete the medium digging (the medium digging work). Wb is groundwater.
(Explanation of soil excavation and discharge method in pipe)
(5) As shown in FIG. 1 (e), the in-pipe sediment excavation / discharge device A is suspended by a suspension device (not shown) immediately above the tube B, and the spray water W is discharged from each of the spray nozzles 11 for excavation. Is excavated, and the earth and sand g of the ground G located directly below the support 1 is excavated, and further, the jet water W is jetted outward from the respective propulsion / washing jet nozzles 8 to The support 1 is pushed downward by W and the mud adhering to the inner peripheral surface of the pipe B is washed.

  At the same time, by sucking the air in the mud discharger 13 from the ground through the guide tube 19 (air lift), the muddy water is taken in from the muddy water intake ports 20 and 20 of the respective branch discharge pieces 13b and 13b, and discharged from each branch. The pieces 13b, 13b → discharge main piece 13a → guide pipe 19 are respectively discharged to the ground.

At this time, when the muddy water joins at the lower end portion of the relatively large-diameter drainage piece 13a through each relatively small-diameter branch discharge piece 13b, the rising flow velocity is decelerated. At the junction point, in other words, at the branch portion of the branch discharge pieces 13b and 13b, the jet water Wa mixed with bubbles is ejected upward from the discharge promotion injection nozzle 14 via the opening / closing valve body 25, thereby branch discharge pieces 13b. , 13b can smoothly discharge the muddy water into the discharge main piece 13a and quickly discharge it.
(6) As shown in FIGS. 1 (f) and (g), the pipe sediment excavating / discharging device A is dug gradually downward until the lower end of the pipe B, that is, the soft rock layer E is reached.
(7) As shown in FIG. 1 (h), when the soft rock layer E is reached, concrete C for rooting or filling is supplied through the ground → guide pipe 19 → mud drainage 13 and each mud intake 20 , 20 pulls up the soil sediment excavation / discharge device A while discharging it downward. c is the supply direction of concrete C.

  Then, when the predetermined amount of concrete C for root consolidation has been released, the supply of the concrete C is stopped, and the in-pipe sediment excavation / discharge device A is pulled up to the ground.

  Here, a plurality of bearing rings 21 are attached to the lower inner peripheral surface of the pipe B at regular intervals in the vertical direction, and the strength against the external pressure of the pipe B is ensured by the bearing ring 21. Adhesiveness of the concrete C placed in the pipe B is ensured satisfactorily.

  The bearing ring 21 can be attached to the inner peripheral surface of the pipe B with a certain distance in the vertical direction over the entire length. In this case, in particular, the adhesion of the concrete C filled therein is improved. be able to.

In addition, the shape of the tube B is not limited to the cylindrical shape as in the present embodiment, and may be formed in a rectangular tube shape or the like.
(8) As shown in FIGS. 1 (e) to (h), the surface layer of the ground G is excavated to lay a chestnut layer 22 and to form a discarded concrete layer 23.

  In this way, when the in-pipe sediment excavation / discharge device A is dug to a predetermined depth, a predetermined amount of concrete C is continuously supplied from the ground through the mud drainage body 13 provided in the in-pipe sediment excavation / discharge device A. By doing so, the concrete C can be firmly rooted or filled in the pipe B, and after the predetermined amount of the concrete C has been supplied, the pipe earth and sand excavation / discharge device A is gradually used as it is. If it is raised, the required work can be completed.

As a result, it is possible to carry out the earth removal work and the consolidation work or the filling work continuously and efficiently in one step, and the construction period and the construction cost can be reduced.
[Description of Sediment Excavation / Discharge Device A in Pipe as Second Embodiment]
As shown in FIGS. 7 to 12, the in-pipe sediment excavation / discharge device A as the second embodiment has the same basic structure as the in-pipe soil excavation / discharge device A as the first embodiment described above. An upper ring-shaped pipe 4 having a propulsion / cleaning injection nozzle 8 connected in communication with the upper end of the support 1 is disposed, and a propulsion / cleaning injection nozzle 10 is connected in communication with the lower end of the support 1. The difference is that the lower ring-shaped pipe 5 is arranged. 16 is an injection hole formed in the peripheral portion of the ceiling portion 1b corresponding to each propulsion / cleaning injection nozzle 8, and 17 is formed in the lower peripheral portion of the peripheral wall portion 1a corresponding to each propulsion / cleaning injection nozzle 10. It is an injection hole.

  In this way, in the in-pipe sediment excavation / discharge device A as the second embodiment, the propulsion / cleaning injection nozzles 8 and 10 are provided at the upper end and the lower end in the support 1, respectively, for each propulsion / cleaning. The jet water W is jetted outward from the jet nozzles 8 and 10 and the support body 1 is pushed downward by the jet water W and the mud adhering to the inner peripheral surface of the pipe B is washed. To be able to.

Here, from each of the propulsion / cleaning injection nozzles 8 and 10, compressed air may be ejected instead of the jet water W according to the present embodiment, or bubbles may be mixed with the jet water W and the compressed air. A mixture of jet water can be ejected, and either one can be adopted as appropriate according to the working conditions such as soil quality.
[Explanation of soil excavation and discharge method in pipe]
Next, an in-pipe soil excavation / discharge method for excavating and discharging the sediment in the pipe B using the in-pipe sediment excavation / discharge device A will be described with reference to FIG. The description of the digging / pressing work shown in FIGS. 7 (a) to 7 (d) is the same as described above, and will be omitted.
(Explanation of soil excavation and discharge method in pipe)
(1) As shown in FIG. 7 (e), the in-pipe sediment excavation / discharge device A is suspended by a suspension device (not shown) at a position directly above the tube B. To excavate the earth and sand g of the ground G located directly below the support 1, and further, spray water W from each of the propulsion / washing spray nozzles 8 and 10 to the upper outer side. While propelling water W pushes the support body 1 downward, the mud adhering to the inner peripheral surface of the pipe B is washed.

  At the same time, by sucking the air in the mud discharger 13 from the ground through the guide tube 19 (air lift), the muddy water is taken in from the muddy water intake ports 20 and 20 of the respective branch discharge pieces 13b and 13b, and discharged from each branch. The pieces 13b, 13b → discharge main piece 13a → guide pipe 19 are respectively discharged to the ground.

At this time, when the muddy water joins at the lower end portion of the relatively large-diameter drainage piece 13a through each relatively small-diameter branch discharge piece 13b, the rising flow velocity is decelerated. At the junction point, in other words, at the branch portion of the branch discharge pieces 13b and 13b, the jet water Wa mixed with bubbles is ejected upward from the discharge promotion injection nozzle 14 via the opening / closing valve body 25, thereby branch discharge pieces 13b. , 13b can smoothly discharge the muddy water into the discharge main piece 13a and quickly discharge it.
(2) As shown in FIGS. 7 (f) and 7 (g), the in-pipe sediment excavation / discharge device A is dug down gradually until the lower end of the pipe B, that is, the soft rock layer E is reached.
(3) As shown in FIG. 7 (h), when the soft rock layer E is reached, concrete C for root consolidation is supplied through the ground → guide pipe 19 → mud drainer 13 and downward from each mud intake 20 and 20 Pull up the sediment excavation and discharge device A in the pipe. c is the supply direction of concrete C for root consolidation.

  Then, when the predetermined amount of concrete C for root consolidation has been released, the supply of the concrete C is stopped, and the in-pipe sediment excavation / discharge device A is pulled up to the ground.

Here, a plurality of bearing rings 21 are attached to the lower inner peripheral surface of the pipe B at regular intervals in the vertical direction, and the strength against the external pressure of the pipe B is ensured by the bearing ring 21. The adhesion of the concrete C for root hardening placed in the pipe B is ensured satisfactorily.
(4) As shown in FIGS. 7 (e) to (h), the surface layer of the ground G is excavated to lay the chestnut layer 22 and to form the discarded concrete layer 23.

  In this way, when the in-pipe sediment excavation / discharge device A is dug to a predetermined depth, a predetermined amount of concrete C is continuously supplied from the ground through the mud drainage body 13 provided in the in-pipe sediment excavation / discharge device A. By doing so, the lower part of the pipe B can be firmly solidified or filled with the concrete C, and after the predetermined amount of the concrete C has been supplied, the in-pipe sediment excavation / discharge device A can be used as it is. If it is gradually raised, the required work can be completed.

  As a result, it is possible to carry out the earth removal work and the consolidation work or the filling work continuously and efficiently in one step, and the construction period and the construction cost can be reduced.

Process explanatory drawing of the operation | work which uses the in-pipe sediment excavation and discharge apparatus as 1st Embodiment which concerns on this invention. Cross-sectional front explanatory drawing in the use condition of the earth and sand excavation and discharge device in the pipe. Plane explanatory drawing of the soil excavation / discharge device in the pipe. Explanatory drawing of the bottom of the soil excavation / discharge device in the pipe. Cross-sectional top view explanatory drawing of the earth and sand excavation and discharge device in the same pipe. Cross-sectional bottom explanatory drawing of the earth and sand excavation and discharge device in the same pipe. Explanatory drawing of the process of the operation | work which uses the in-pipe sediment excavation and discharge apparatus as 2nd Embodiment which concerns on this invention. Cross-sectional front explanatory drawing in the use condition of the earth and sand excavation and discharge device in the pipe. Plane explanatory drawing of the soil excavation / discharge device in the pipe. Explanatory drawing of the bottom of the soil excavation / discharge device in the pipe. Cross-sectional top view explanatory drawing of the earth and sand excavation and discharge device in the same pipe. Cross-sectional bottom explanatory drawing of the earth and sand excavation and discharge device in the same pipe.

Explanation of symbols

A In-pipe sediment excavation / discharge device 1 Support body 2 Linking body 3 Suspended wire 4 Upper ring-shaped pipe 5 Lower ring-shaped pipe 6 Upper water supply pipe 7 Lower water supply pipe 8 Propulsion / cleaning injection nozzle 9 Upper water supply pipe
10 Propulsion / cleaning spray nozzle
11 Drilling nozzle

Claims (5)

  An excavation nozzle for excavating earth and sand in pipes such as steel pipe piles built in the ground with jet water, and a mud drainer for discharging the earth and sand excavated by the excavation jet nozzle to the ground in the muddy state, An in-pipe earth and sand excavation / discharge device comprising a mud discharge body and a support for supporting the above-described excavation jet nozzle.   The muddy drainage body includes a cylindrical discharge piece extending in the vertical direction, and a branch discharge piece extending and branching outwardly from the lower end portion of the discharge book piece. 2. A discharge promoting injection nozzle for promoting discharge of muddy water by injecting spray water and / or compressed air upward in the discharge main piece in the branch base of Pipe excavation and discharge equipment.   2. A propelling / cleaning spray nozzle for cleaning the inner peripheral surface of the pipe, and for propelling the support downward by jetting spray water and / or compressed air toward the upper outside. Or the earth-and-sand excavation and discharge device in 2 of description.   The pipe soil and sand excavation / discharge device according to any one of claims 1 to 3, wherein concrete can be supplied into a pipe such as a steel pipe pile from the ground through a muddy drainage body.   When the earth and sand in a pipe such as a steel pipe pile is excavated with jet water by the in-pipe earth and sand excavation and discharge device according to claim 4, the excavated earth and sand are discharged to the ground in a muddy state, and the pipe is excavated to a predetermined depth. An in-pipe soil excavation / discharge method in which a predetermined amount of concrete is supplied from the ground into the pipe through a mud discharger provided in the in-pipe sediment excavation / discharge device while the above-mentioned in-pipe sediment excavation / discharge device is lifted upward.

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