JP2011190602A - Back-filling injection system - Google Patents

Back-filling injection system Download PDF

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Publication number
JP2011190602A
JP2011190602A JP2010057206A JP2010057206A JP2011190602A JP 2011190602 A JP2011190602 A JP 2011190602A JP 2010057206 A JP2010057206 A JP 2010057206A JP 2010057206 A JP2010057206 A JP 2010057206A JP 2011190602 A JP2011190602 A JP 2011190602A
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Japan
Prior art keywords
injection
backfill
material
segment
mixing nozzle
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Pending
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JP2010057206A
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Japanese (ja)
Inventor
Masami Ichikawa
Osamu Kobayashi
Satoru Yamauchi
修 小林
悟 山内
政美 市川
Original Assignee
Tac:Kk
Toda Constr Co Ltd
戸田建設株式会社
株式会社タック
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Application filed by Tac:Kk, Toda Constr Co Ltd, 戸田建設株式会社, 株式会社タック filed Critical Tac:Kk
Priority to JP2010057206A priority Critical patent/JP2011190602A/en
Publication of JP2011190602A publication Critical patent/JP2011190602A/en
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Abstract

[PROBLEMS] To reliably fill a backfill material from a segment to the entire circumference of a tail void with a relatively low injection pressure at low cost, and can reliably cope with ground subsidence and curved construction, and reliably prevent water leakage. A backfill injection system is provided.
In a backfilling injection system, a backfilling main material and a hardened material are mixed by a mixing nozzle 22 provided in an injection hole 28 of a segment 16 and a mixed backfilling material is injected into a tail void 20. The nozzles 22 are respectively provided in the injection holes 28 of a plurality of segment pieces among the injection holes 28 formed in each segment piece in the circumferential direction of the segment 16, and each mixing nozzle 22 includes a backfill main material from a supply source and It is connected to a valve unit 24 that distributes and supplies the hardened material to each mixing nozzle 22, and the valve unit 24 is controlled by a backfill injection control unit 26 at least by the mixing nozzle, the backfill material injection time, the injection amount, and the injection pressure. Is done.
[Selection] Figure 1

Description

  The present invention relates to a backfill injection system, and more particularly, to a backfill injection system for injecting a backfill material from an injection hole provided in a segment into a tail void.

  In general, tail voids generated at the time of shield excavation are an important issue in order to prevent loosening of the ground and settlement of the ground surface as well as to prevent water leakage as soon as it is filled with a backfill material.

  For this reason, in a shield machine having a relatively large cross section, a backfill injection device is provided in the shield machine itself, and the tail void is automatically filled from there with a backfill material.

  However, in a shield machine with a relatively small cross section, if a backfill injection device is provided in the shield machine itself, the structure becomes complicated and the interior of the machine becomes narrow. Generally, the backfilling material is injected into the tail void from the formed injection hole.

  As shown in Patent Document 1, when a backfill material is injected into a tail void from an injection hole formed in a segment, generally, injection is performed at a predetermined injection pressure and injection amount from one injection hole for a segment 1 ring. Like to do.

JP 2004-156276 A

  As described above, when the backfilling material is injected at a predetermined injection pressure and injection amount from one injection hole for the segment 1 ring, the injection pressure increases when the backfilling material is injected. Stop the excavation, stop the injection from the injection hole of the segment piece being manually injected, change to the injection hole formed in the other segment piece, and reverse the injection pressure, When it does not rise, there is a concern that the backfilling material is not uniformly injected into the tail void and is concentrated and injected into one soft position of the natural ground.

  Also, immediately after injection, the backfilling material does not go around the tail void all around, the tail void will be crushed in the ground that is not self-supporting, and ground subsidence will occur, and even during curve construction, it will not be filled evenly, The reaction force cannot be taken, and further, if the backfilling material does not surely go around the entire circumference, it may cause water leakage.

  The purpose of the present invention is to ensure that the backfilling material can be filled from the segment to the entire circumference of the tail void at low cost and with relatively low injection pressure. It is an object of the present invention to provide a backfill injection system that can be prevented.

(1) In order to achieve the above-mentioned object, the backfilling injection system of the present invention mixes the backfilling main material and the hardened material with a mixing nozzle provided in the injection hole of the segment, and mixes the backfilling material in a mixed state. In a backfill injection system that injects into the tail void,
The mixing nozzle is provided in each injection hole of a plurality of segment pieces among the injection holes formed in each segment piece in the circumferential direction of the segment,
Each mixing nozzle is connected to a valve unit that distributes and supplies the backfilling main material and the curing material from the supply source to each mixing nozzle,
In the valve unit, at least a mixing nozzle to be injected, an injection time of the backfill material, an injection amount, and an injection pressure are controlled by a backfill injection control unit.

  According to the present invention, the mixing nozzle for mixing and injecting the backfilling main material and the curing material into the plurality of injection holes of the segment and injecting the valve unit to which the mixing nozzle is connected by the control unit, the backfilling material By controlling the injection time, injection amount, and injection pressure, the backfilling material is reliably injected all around the tail void at a relatively low pressure compared to the case where it is injected from one injection hole and filled all around the tail void. In addition, it is possible to reduce the influence on underground objects and the ground.

  In addition, it is possible to prevent the backfill material from entering the same position without increasing the injection pressure in the soft ground layer, and it is possible to uniformly fill.

  Furthermore, the segment can be fastened quickly during the construction of a sharp curve, and the reaction force can be surely taken.

  In addition, by evenly filling the backfill material, it is possible to set the segment axis at the center of the shield machine, and in the case of the RC segment, a defect such as a crack occurs in the case of the steel segment. It becomes difficult to do.

  (2) In the present invention, in (1), the backfill injection control unit controls the valve unit to sequentially switch the mixing nozzles to be injected every set time within a predetermined injection amount range. Can be.

  With such a configuration, the backfilling material can be more reliably injected all around the tail void.

(3) In the present invention, in (2), provided with a pressure sensor for detecting the injection pressure of the backfill material,
The backfill injection control unit can control to switch the mixing nozzle to be injected to the next mixing nozzle even within the set time when the detection value by the pressure sensor exceeds a set value.

  By adopting such a configuration, when the injection pressure increases, the backfilling material can be immediately injected from the other injection holes to ensure uniform injection.

  (4) In the present invention, in (1), the backfill injection control unit controls the valve unit to simultaneously set the backfill from a plurality of mixing nozzles within a predetermined injection amount range. The material can be injected.

  With such a configuration, it is possible to reliably inject the tail void all around with a low injection pressure.

1 is an overall schematic cross-sectional view showing a backfill injection system according to an embodiment of the present invention. It is sectional drawing which follows II-II of FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a backfill injection system according to an embodiment of the present invention.

  As shown in FIG. 1, the backfill injection system 10 according to the present embodiment assembles a segment 16 after excavation by the cutter bit 14 of the shield machine 12, and between the segment 16 and the excavated ground 18 The back filling material is injected over the entire circumference of the tail void 20, and includes a plurality of mixing nozzles 22, a valve unit 24, and a back filling injection control unit 26.

  The mixing nozzle 22 mixes the backfill main material and the curing material immediately before injection and injects them from the injection hole 28 of the segment 16 into the tail void 20. A plurality of mixing nozzles 22 are formed at different positions in the circumferential direction of the segment. A plurality of injection holes 28 are provided.

  Specifically, as shown in FIG. 2, the segment 16 is composed of a plurality of, for example, five segment pieces 16a, 16b, 16c, 16d, and 16e to form one ring. 16a, 16b, 16c, 16d, and 16e are provided with injection holes 28a, 28b, 28c, 28d, and 28e, respectively. For example, four injection holes 28a, 28b, 28c, and 28d have mixing nozzles 22a, 22b, 22c and 22d are provided.

  Each mixing nozzle 22a, 22b, 22c, 22d is connected to a backfilling main material hose 30 and a hardened material hose 32, and each of these backfilling main material hose 30 and a hardened material hose 32 is connected to the valve unit 24. Yes.

  The valve unit 24 can distribute and supply the backfill main material and the hardener supplied from the supply source via the backfill main material pipe 34 and the hardener pipe 36 to the mixing nozzles 22a, 22b, 22c, and 22d. Yes.

  The valve unit 24 is controlled by a backfill injection control unit 26 to control the mixing nozzles 22a, 22b, 22c, 22d to be injected, the injection time, the backfill material injection amount, and the injection pressure.

  The backfill control unit 26 includes a backfill injection control panel 48 and a central monitoring and measurement system 50, and includes flow meters 38 and 40, a pressure sensor 42, a backfill injection operation panel 44, and a measurement signal interface panel 46. And are connected.

  The backfill injection control panel 48 monitors the measurement data from the flow meters 38 and 40 and the pressure sensor 42 according to the injection mode set by the backfill injection operation panel 44, and each of the injection pump and valve unit 24. The injection switching to the mixing nozzles 22a, 22b, 22c, and 22d is controlled.

  The central monitoring and measuring system 50 stores the injection method planned in advance and transmits it from the backfill injection control panel 48 to the backfill injection operation panel 44, and also manages the excavation on the shield machine driving cart 52 or the backfill dedicated cart. The drilling data is acquired from the board and the injection status is monitored.

  The flow meters 38 and 40 are attached to the backfill main material pipe 34 and the hardener pipe 36, and detect the flow rates of the backfill main material and the hardener supplied to the valve unit 24.

  The pressure sensor 42 is attached to the backfill main material pipe 34 and detects the pressure in the backfill main material pipe 34.

  The detection results of the flow meters 38 and 40 and the detection result of the pressure sensor 42 are transmitted to the measurement signal interface board 46 via the backfill injection control unit 26.

  The backfill injection operation panel 44 performs setting of injection modes such as a fixed time setting injection mode, an injection amount management mode, an injection pressure management mode, an all-hole simultaneous injection mode, and management of injection conditions.

  The measurement signal interface board 46 is configured to acquire excavation data from the excavation management board on the shield excavator operation carriage 52 or the backfill dedicated carriage and transmit it to the backfill injection control board 48.

  Next, the injection state of such a backfill injection system 10 will be described.

  First, the plurality of mixing nozzles 22a, 22b, 22c, and 22d are set in the plurality of injection holes 28a, 28b, 28c, and 28d of the segment 16.

  Next, simultaneously with the start of excavation of the shield machine 12, the injection is started in the injection mode set by the backfill injection operation panel 44.

  In this case, the injection signal is sent from the backfill injection control panel 48 to the backfill injection operation panel 44 by the injection method planned by the central monitoring panel measurement system 50.

  Injection is performed by taking a signal from the backfill injection control panel 48 to the valve unit 24 and automatically controlling the selection of each mixing nozzle 22a, 22b, 22c, 22d, predetermined time, predetermined injection amount, and predetermined pressure in the set injection mode. Make an injection.

  A signal when the upper limit and lower limit set values of the flow meters 38 and 40 and the pressure sensor 42 are exceeded is sent to the backfill injection control panel 48.

  The sent signal is judged by the central monitoring and measuring system 50, and if it exceeds the set value, a signal is transmitted to the valve unit 24 to start backfilling the next hole.

  If the set value is not exceeded, injection is performed sequentially in the selected injection mode.

  The injection amount of the backfill material in accordance with the excavation is integrated with the shield jack speed signal from the measurement signal interface board 46, the shield excavator 12 advances, the volume of the generated tail void 20 minutes is calculated, and the necessary amount of backfill material is obtained. Pump with a variable pump.

  In addition, when a copy cutter is used to correct a curved portion or meandering and the tail void 20 becomes large, the flow rate is automatically calculated.

  The injection status is sent to the central monitoring panel measurement system 50, accumulated as data, stored as a record, and printed as a form.

  At the end of excavation, signals are received in the order of the measurement signal interface board 46, the backfill injection control board 48, and the valve unit 24, and the backfilling is finished.

  In this way, by controlling the valve unit 24 and sequentially switching the mixing nozzles 22a, 22b, 22c, and 22d that are injected every set time within a predetermined injection amount range, a relatively low injection pressure is obtained. Thus, the backfilling material can be more reliably injected all around the tail void.

  Further, when the detection value by the pressure sensor 42 that detects the injection pressure of the backfill material exceeds the set value, the mixing nozzles 22a, 22b, 22c, and 22d that are injected even within the set time are, for example, in order from the mixing nozzle 22a. By switching to the mixing nozzle 22b, for example, when the injection pressure rises, the backfilling material can be immediately injected from the other mixing nozzles to ensure uniform injection.

  In this case, if the injection amount per segment ring is set according to the soil, the injection amount of the injection hole that does not enter due to the increase in injection pressure is automatically distributed to other holes and integrated to ensure the injection amount. Infusion management.

  In addition, when a predetermined amount cannot be injected in the segment 1 ring, the injection management is performed such that the accumulated amount is accumulated and injected in the next ring to secure the injection amount.

  Furthermore, when the injection pressure does not increase, the injection from the mixing nozzle is stopped at a predetermined time, and the next mixing nozzle is switched to prevent the backfill material from staying in one place and uniform. An injection can be performed.

  Further, the backfill injection controller 26 controls the valve unit 24 to inject the backfill material simultaneously from a plurality of mixing nozzles 22a, 22b, 22c, 22d within a predetermined injection amount range for a set time. By doing so, injection to the entire circumference of the tail void can be performed reliably with a low injection pressure.

  The present invention is not limited to the embodiment described above, and can be modified into various forms.

  For example, in the present invention, if a shield tunnel is constructed using a shield machine, the present invention can be applied to a mud pressure shield method, a mud pressure shield method, and other shield methods.

  Further, the number of segment injection holes and the number of mixing nozzles to be used are not limited to the above-described embodiment as long as they are plural, and can be appropriately changed according to the excavation conditions.

DESCRIPTION OF SYMBOLS 10 Backfill injection system 12 Shield machine 16 Segment 20 Tail void 22, 22a, 22b, 22c, 22d Mixing nozzle 24 Valve unit 26 Backfill injection control part 28, 28a, 28b, 28c, 28d, 28e Injection hole 38, 40 Flow volume Total 42 Pressure sensor 48 Backfill injection control panel 50 Central monitoring measurement system

Claims (4)

  1. In the backfilling injection system that mixes the backfilling main material and the hardened material with a mixing nozzle provided in the injection hole of the segment and injects the mixed backfilling material into the tail void.
    The mixing nozzle is provided in each injection hole of a plurality of segment pieces among the injection holes formed in each segment piece in the circumferential direction of the segment,
    Each mixing nozzle is connected to a valve unit that distributes and supplies the backfilling main material and the curing material from the supply source to each mixing nozzle,
    The backfill injection system is characterized in that the valve unit controls at least a mixing nozzle to be injected, a backfill material injection time, an injection amount, and an injection pressure by a backfill injection control unit.
  2. In claim 1,
    The backfill injection control unit controls the valve unit to sequentially switch mixing nozzles to be injected every set time within a predetermined injection amount range.
  3. In claim 2,
    It has a pressure sensor that detects the injection pressure of the backfill material,
    The backfill injection control unit controls to switch the mixing nozzle to be injected into the next mixing nozzle within the set time when the detection value by the pressure sensor exceeds a set value. system.
  4. In claim 1,
    The backfill injection control unit controls the valve unit to inject the backfill material from a plurality of mixing nozzles simultaneously for a set time within a predetermined injection amount range. .
JP2010057206A 2010-03-15 2010-03-15 Back-filling injection system Pending JP2011190602A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014020076A (en) * 2012-07-17 2014-02-03 Taisei Corp Method of manufacturing seal structure
CN105649655A (en) * 2016-03-25 2016-06-08 粤水电轨道交通建设有限公司 Device used for grouting reinforcement from interior of shield tunneling machine to peripheral stratum

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61229098A (en) * 1985-04-01 1986-10-13 Nippon Kiso Kogyo Kk Back filling injection method
JPH11107686A (en) * 1996-02-22 1999-04-20 Toyo Technos:Kk Long distance driving method in semishield method
JP2005188235A (en) * 2003-12-26 2005-07-14 Fukuda Corp Injection material injecting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61229098A (en) * 1985-04-01 1986-10-13 Nippon Kiso Kogyo Kk Back filling injection method
JPH11107686A (en) * 1996-02-22 1999-04-20 Toyo Technos:Kk Long distance driving method in semishield method
JP2005188235A (en) * 2003-12-26 2005-07-14 Fukuda Corp Injection material injecting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014020076A (en) * 2012-07-17 2014-02-03 Taisei Corp Method of manufacturing seal structure
CN105649655A (en) * 2016-03-25 2016-06-08 粤水电轨道交通建设有限公司 Device used for grouting reinforcement from interior of shield tunneling machine to peripheral stratum

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