JP5300696B2 - Consolidation material injection method and consolidation material injection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically perform sure and proper injection throughout the total length. <P>SOLUTION: A difference injected amount as the difference between the target injected amount and integrated injected amount of pumps 53-1, 53-2 and 53-3 is allocated to another in-operation pump so that the target injected amount of the in-operation pump can be increased; and the integrated injected amount from each of the in-operation pumps reaches the target injected amount. In this case, when the pressure of the at least one pump is lower than the low pressure-side minimum necessary pressure, the total target injected amount is increased only in the case where the total target injected amount is not increased until then; and an injected amount, which is obtained by dividing the difference injected amount as a difference between the total target injected amount after its increase and the actual total injected amount of all the stopped pumps by the number of the in-operation pumps, is set as the target injected amount of each of the in-operation pumps. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a consolidation material injecting method and a consolidation material injecting device, and in particular, a peripheral portion of a full length of a reinforcing pipe placed on a natural ground is divided into a plurality of zones, and openings are provided at positions corresponding to the respective zones. A plurality of injection pipes are inserted into the reinforcement pipes, and the solidification material is injected into the reinforcement pipes from the pumps through the injection pipes, and the solidification materials are ejected to the zones around the reinforcement pipes from the discharge holes formed in the reinforcement pipes. The present invention relates to a consolidated material injecting method and a consolidated material injecting apparatus for forming a consolidated region.

  In the mountain tunnel, a long tip receiving work (forebaring) is applied to the natural ground in front of the face in order to suppress the preceding displacement of the natural ground to be excavated and to prevent the natural ground from loosening and to ensure the safety of construction. This long tip receiving work uses a drill jumbo normally used in mountain tunnels to drill a small diameter steel pipe with an outer diameter of about 101.6 to 114.3 mm using a dedicated bit in a double pipe method and insert the steel pipe at the same time. The injection material is injected at a predetermined pressure from the hole formed in the hole to form a limited mountain improvement zone in which a steel pipe enters the outer periphery of the excavation line. For the same purpose, there is a mirror reinforcement work in which a cutable reinforcing material, which replaces a steel pipe, is cast in the horizontal direction from the mirror part sprayed concrete of the face.

Fig. 9 is an explanatory drawing of the long tip receiving work and mirror reinforcing work, and shows the state where the receiving work and the mirror reinforcing work are applied near the top end in front of the tunnel face under construction. (A) is a longitudinal section. Figure (B) is a cross-sectional view. The ground face 1 exposed in the tunnel excavation work so far is covered with shotcrete 2, and the rear tunnel space (left side in the figure) of the face 1 has already been supported with excavation completed. . As support, in the tunnel space in the tunnel excavation section, shotcrete 5 is applied so as to cover the natural ground, and inside the tunnel, steel support works 4 are formed along the cross-sectional shape of the tunnel. It is built in the direction at predetermined intervals (for example, every 1 m), and the secondary lining concrete 3 is placed inside the shotcrete 5.
Further, prior to excavation work, a receiving work is formed in the natural ground so as to form an arch in the circumferential direction at a predetermined interval with respect to the excavation direction at the top end portion in front of the face of the tunnel space. A mirror reinforcement work is formed in the horizontal direction from the sprayed concrete 2 of 1.
The long tip receiving work consists of a long tip receiving steel pipe (reinforcing steel pipe) 6 and surroundings of the reinforcing steel pipe, which are natural ground reinforcements placed at predetermined intervals along the transverse cross-sectional shape of the tunnel and at predetermined intervals in the excavation direction. It is comprised with the consolidation area | region 7 formed over the full length in the part. Reinforcing steel pipes 6 are driven at a predetermined elevation angle from the upper outer periphery of the face 1 toward the front ground, and are provided in a large number in the tunnel circumferential direction. The consolidated region 7 is formed by inserting an injection pipe (not shown) into the reinforcing steel pipe 6 to inject the consolidated material, and ejecting the consolidated material from a discharge hole formed at an appropriate position of the reinforcing steel pipe 6 to surround each reinforcing steel pipe. The part is formed over the entire length.

The mirror reinforcement work is made up of a large number of fiber reinforced pipes 8 placed in a horizontal direction in a predetermined pattern from the sprayed concrete 2 of the face 1, and a consolidated region 9 formed over the entire length of the periphery of the reinforced pipe. It is configured. The mirror reinforcement work is to reinforce the ground so that it does not collapse as soon as it is dug in the tunnel, and it is cut and removed in parallel with the progress of the excavation. For this reason, the fiber reinforcement pipe | tube 8 which is easy to cut | disconnect is used.
Reinforcing pipes used for the above-mentioned long tip receiving work and mirror reinforcing work are couplers such as steel pipes (about 3m long) and fiber reinforced pipes (in the case of mirror reinforcing works) with some strength. It is standard that a length of 12 m or more is cast while connecting, and it is necessary to uniformly form a consolidated region over the entire length of the periphery of the long reinforcing pipe. For this reason, in the prior art (see Patent Document 1), as shown in FIG. 10, the total length of the reinforcing pipe 6 is divided into a plurality of zones (three zones in the figure) Z1 to Z3 every several meters. The three injection pipes 10-1 to 10-3 having different lengths that are opened in the tube are inserted into the reinforcing pipe 6 after the placement, and pumps P-1 to P-3 are connected to the respective injection pipes. A method is proposed in which the injected material is pumped and the injected material is ejected from the discharge holes formed in the reinforcing pipe 6 in each zone to form the consolidated region 7 around the entire length of the reinforcing steel pipe as shown in FIG. Has been. 10 and 111, 11 is a mouth caulking for caulking the gap between the natural ground and the mouth of the reinforcing pipe 6, 12 is an in-tube caulking for caulking the injection pipe at the mouth, and 13 is a packer.

  By the way, in the conventional injection method, a predetermined amount of injection is performed for each zone while controlling each pump so that the injection pressure in each zone does not increase too much. However, if there is a zone in which there is a crack or the like in the ground and the injection material escapes, the injection amount in that zone remains insufficient. In order to avoid this, the operator performs injection while checking the discharge amount and injection pressure of each pump, and if there is a zone where the pressure is too low or a zone where the injection amount is insufficient, the pump corresponding to that zone or It was necessary to operate the pumps in adjacent zones appropriately and to manually operate the pumps so that a good injection state could be obtained over the entire length. However, this method has a problem that a skilled worker is required, and that the worker becomes clear about the pump.

JP 2000-303776 A

  In view of the above, an object of the present invention is to automatically perform reliable and good injection over the entire length without requiring a skilled worker.

The present invention divides a full length peripheral portion of a reinforcement pipe placed in a natural ground into a plurality of zones, and inserts a plurality of injection pipes having openings at positions corresponding to the respective zones into the reinforcement pipes. Through which the solidified material is injected into the reinforcing pipe from the pump, and the solidified material is ejected from the discharge holes formed in the reinforcing pipe to each zone around the reinforcing pipe to form a consolidated region and the solidified material injection method. It is a binder injection device.
-Consolidated material injection method The solid material injection method of the present invention is a step of setting a target injection amount of each pump and a total target injection amount of all pumps, a pressure of each pump at the time of injection, and an injection from each pump to each zone. The step of monitoring the integrated injection amount, and when the integrated injection amount from the predetermined pump reaches the target injection amount, if the pressure of the pump is higher than the required minimum pressure on the low pressure side, the injection was normally performed The step of stopping the pump as follows, when the pressure of the pump becomes higher than the allowable maximum pressure on the high pressure side before the cumulative injection amount from the predetermined pump reaches the target injection amount, Assigning a differential injection amount, which is the difference between the target injection amount of the pump and the integrated injection amount, to the operating pump to increase the target injection amount of the operating pump, and the integrated injection amount from each differential pump When the target injection volume is reached, if the pressure of at least one pump is lower than the required minimum pressure on the low pressure side, the total target injection volume is increased only if the total target injection volume has not been increased so far. The injection amount obtained by dividing the difference injection amount, which is the difference between the total target injection amount after the increase and the actual total injection amount of all the stopped pumps, by the number of active pumps is used as the target injection amount for each operating pump. Step.

-Consolidating material injecting device The consolidating material injecting device of the present invention is provided corresponding to each of the injection tubes, and injects the consolidated material into the reinforcing tube through the injecting tube and also injects the consolidated material into the injecting tube. The pump that detects the injection amount and the pressure of the pump and outputs the injection amount signal and the pressure signal, the setting unit that sets the target injection amount of each pump and the total target injection amount of all the pumps, the pressure of each pump at the time of injection, and Integrated injection amount calculating means for calculating the integrated injection amount injected into each zone from each pump, and the pump pressure when the integrated injection amount from a predetermined pump reaches the target injection amount is higher than the necessary minimum pressure on the low pressure side In this case, the pump is stopped assuming that the injection has been normally performed, and the pressure of the pump becomes higher than the set pressure on the high pressure side before the integrated injection amount from the predetermined pump reaches the target injection amount. The pump directly (1) When the pressure of the pump becomes higher than the allowable maximum pressure on the high pressure side before the integrated injection amount from the predetermined pump reaches the target injection amount, the target injection of the pump A differential injection volume, which is the difference between the volume and the total injection volume, is assigned to the operating pump to increase the target injection volume of the operating pump, and (2) the integrated injection volume from each differential pump is the target When the injection volume is reached, if the pressure of at least one pump is lower than the required minimum pressure on the low pressure side, increase the total target injection volume only if the total target injection volume has not been increased until then. Target injection with the target injection rate of each active pump as the injection rate obtained by dividing the differential injection rate, which is the difference between the total target injection rate of the pump and the actual total injection rate of all stopped pumps, by the number of active pumps Quantity changing means.

According to the present invention, a skilled worker can be automatically and surely and satisfactorily injected over the entire length without requiring a skilled worker.
According to the present invention, it is possible to replenish the consolidated material from an adjacent zone when the injection amount of a certain zone is insufficient without imposing a burden on the pump. That is, according to the present invention, the pressure of each pump at the time of injection and the integrated injection amount injected from each pump into each zone are monitored, and the pump before the integrated injection amount from a predetermined pump reaches the target injection amount. When the pressure of the pump becomes higher than the allowable maximum pressure on the high pressure side, the pump is immediately stopped, and a differential injection amount that is the difference between the target injection amount of the pump and the integrated injection amount is assigned to the operating pump to perform the operation. Since the target injection volume of the medium pump is increased, the caulking material can be replenished from the pump adjacent to the zone corresponding to the pump that has stopped at a high pressure without imposing a burden on the pump. Good injection.
According to the present invention, when the consolidated material escapes due to a crack or the like in a certain zone, the amount of the consolidated material injected by the pump corresponding to the zone can be increased. That is, according to the present invention, when the integrated injection amount from each differential pump reaches the target injection amount, if the pressure of at least one pump is lower than the required minimum pressure on the low pressure side, the total target injection is performed until then. Only when the volume is not increased, increase the total target injection volume and divide the differential injection volume, which is the difference between the total target injection volume and the actual total injection volume of all stopped pumps, by the number of active pumps. Therefore, if there is a zone where the injected material escapes due to cracks or the like, the target injection amount from the pump corresponding to the zone is increased and injected. The material can be reinforced and good injection can be achieved over the entire length of the reinforcement tube.

It is explanatory drawing of the tunnel reinforcement construction which can apply this invention. It is a block diagram of the reinforced steel pipe in a long tip receiving work. It is a reinforced steel pipe sectional view. It is an external view of a pump and the distribution control apparatus 5. It is a block diagram of the pump and distribution control apparatus of this invention. It is a consolidation material injection process flow of a processing apparatus. This is a flow for determining and updating a new target injection amount of the pump in operation. The initial target injection amount of each pump, the target injection amount after change, and the final integrated injection amount (discharge flow rate) when the pumping operation is performed according to the processing flow of FIGS. It is a chart which shows. It is explanatory drawing of a elongate tip receiving work and a mirror reinforcement work. It is explanatory drawing 1 of a prior art. It is explanatory drawing 2 of a prior art.

(A) Tunnel reinforcement work FIG. 1 is an explanatory view of a tunnel reinforcement work to which the present invention can be applied, and FIG. 2 is a configuration diagram of a reinforcement steel pipe in a long tip receiving work, and the reinforcement pipe in a mirror reinforcement work has a similar structure. ing.
FIG. 1 shows a state in which a front receiving work is provided near the front top end of the face of the tunnel under construction and a mirror reinforcement work is applied to the face. The ground face 21 exposed in the tunnel excavation work so far is provided with shotcrete 22, and a support is formed in the tunnel space behind the face 21 in a state where excavation has already been completed. That is, sprayed concrete 5 is applied in the excavated tunnel space so as to cover the natural ground, and a steel supporter 4 is formed in the tunnel cross-sectional shape in a predetermined direction in the tunnel excavation direction. It is built at intervals (for example, every 1 m), and the secondary lining concrete 3 is placed inside the shotcrete 5. Prior to the excavation work in the future, the receiving work is formed in the natural ground so as to form an arch in the circumferential direction at a predetermined interval with respect to the excavation direction at the top end in front of the face of the tunnel space, and The mirror reinforcement is formed in the horizontal direction from the sprayed concrete 22 of the face 21.
The long tip receiving work includes a long tip receiving steel pipe (reinforced steel pipe) 26 that is placed at a predetermined pitch along the transverse cross-sectional shape of the tunnel at predetermined intervals in the digging direction and becomes a natural ground reinforcing material, and the reinforcement It is comprised with the consolidated area | region 27 formed over the full length in the steel pipe peripheral part. The reinforcing steel pipes 26 are driven at a predetermined elevation angle from the upper outer periphery of the face 21 toward the front ground, and a large number are provided in the circumferential direction of the tunnel. After placing the reinforcing steel pipe 26, the gap between the sprayed concrete 22 of the face 21 and the mouth portion of the reinforcing steel pipe 26 is mouth caulked (see 34 in FIG. 2).

The reinforcing steel pipe 26 is standard in that a steel pipe having a length of about 12 m or more is cast while connecting a steel pipe of about 3 m with a coupler, and it is necessary to form a consolidated region 27 uniformly over the entire length of the long reinforcing pipe. There is. Therefore, in the present invention, the length of the reinforcing pipe 26 is divided into a plurality of regions (three regions in the figure) Z1 to Z3 for each predetermined distance and opened in each zone, as in the prior art. 3 injection pipes 31-1, 31-2, 31-3 (see FIG. 2) having different diameters are inserted into the reinforced steel pipe 26 after placement, and a consolidated material is injected into the reinforced steel pipe 26 from each injection pipe. Then, the consolidated region 27 is extended to the periphery of each reinforced steel pipe by ejecting the consolidated material to the regions 1, 2 and 3 of the peripheral portion of the reinforced steel pipe from the discharge holes formed at equal pitches at appropriate positions of the reinforced steel pipe 26. It forms over.
As shown in FIG. 2, the injection pipes 31-1, 31-2, and 31-3 are integrally supported by a spacer 32 and inserted into the reinforcing steel pipe 26. After insertion, the mouth of the reinforcing steel pipe is subjected to in-tube caulking 33. . The spacer 32 has a cross sectional shape shown in the reinforcing steel cross-sectional view of FIG. 3, for supporting at 120 ⁰ intervals injector tubes 31-1, 31-2, 31-3 in the circumferential direction. At a predetermined pitch in the axial direction of the reinforcing steel 26, and the discharge holes 26a for ejecting the consolidated material at 90 ⁰ intervals are formed.

鏡補強工は、切羽２１の吹き付けコンクリート２２より所定のパターンで水平方向に打設された多数の繊維補強管２８と、該補強管の周辺部に全長に亘って形成した固結領域２９とで構成されている。固結領域２９は、固結領域２８と同様の方法で形成される。 A urethane-based injection material is used as the caking material, and liquid A and B are mixed in merging pipes 35-1, 35-2, 35-3 provided at the mouth of the reinforcing steel pipe 26, and injection pipes 31-1, 31- Remixed with the tip static mixers 36-1, 36-2 and 36-3 of Nos. 2 and 31-3 and injected into the reinforcing tube 26. Liquid A and liquid B have the components shown in Table 1.

The mirror reinforcement work is made up of a large number of fiber reinforced pipes 28 laid horizontally in a predetermined pattern from the sprayed concrete 22 of the face 21 and a consolidated region 29 formed over the entire length of the peripheral part of the reinforced pipe. It is configured. The consolidated region 29 is formed by the same method as the consolidated region 28.

A consolidated material injection device 50 according to the present invention is disposed on the traveling carriage 60 behind the face 21 of the excavated tunnel space. The solidified material injection device 50 is supplied with an A liquid feeder 51 for supplying A liquid, a B liquid feeder 52 for supplying B liquid, and A liquid and B liquid supplied from the respective feeders, and an injection hose (pressure feed pipe) 61-1. , 61-2, 61-3, and the joining pipes 35-1, 35-2, 35-3 are injected into each of the three injection pipes 31-1, 31-2, 31-3 3 The pumps 53-1, 53-2, and 53-3 are provided, and a distribution control device 54 that controls the amount of the consolidated material injected into each injection pipe by each pump is provided.
One ends of injection hoses 61-1, 61-2 and 61-3 are connected to the A liquid discharge port and the B liquid discharge port of each pump 53-1, 53-2, 53-3, and the injection hose 61-1 , 61-2, 61-3, the other end of the A liquid inlet AI of the merge pipes 35-1, 35-2, 35-3 connected to the respective injection pipes 31-1, 31-2, 31-3 The B liquid inlet BI is connected to each pump so that the solidified material can be injected into the corresponding injection pipe from each pump.
FIG. 4 is an external view of the pumps 53-1, 53-2, 53-3 and the distribution control device 54. Each of the pumps 53-1, 53-2, 53-3 has the same configuration and has an operation panel on the upper side. / Display part OPDL is provided, and below the A liquid feeder and B liquid feeder, respectively, the A liquid intake port AENT, B liquid intake port BENT, and the A liquid and B liquid are introduced to the injection tube side. Discharge A liquid discharge port AEXT, B liquid discharge port BEXT, and electromagnetic valves VLB1 and VLB2 for A liquid and B liquid are provided.

(B) Configuration of Pump and Distribution Control Device FIG. 5 is a configuration diagram of the pumps 53-1, 53-2, 53-3 and the distribution control device 54 of the present invention. -3 has the same configuration, and the drawing shows details of the pump 53-2. The pump 53-2 includes electromagnetic valves I and II 53a and 53b that open and close the flow paths of the liquid A and liquid B, a pressure detection unit 53c that detects the pressure of the pump, and a flow rate that detects the discharge flow rate of the consolidated material from the pump. A detection unit 53d, an operation unit 53e having operation setting switches, a display unit 53f, an output unit for notifying the distribution control device 54 of the detected pressure and flow rate (injection amount) by a pressure signal PLS and a flow rate signal FLS, and a pump A drive control unit 53h that performs start and stop control is provided. The operation unit 53e is provided with a pressure setting unit 71a for setting the actual pressure of the pump, a flow rate setting unit 71b for setting the discharge flow rate of the consolidated material, and various other operation / setting switches 71c. The target pressure range HH to HL of the pump is determined by design specifications, and HH = 2.5 MPa (megapascal) and HL = 0.5 MPa.
The distribution control device 54 is provided with a processing unit 54a having a microcomputer configuration for performing the binder injection control, an operation unit 54b, and a display 54c. The processing unit 54a functionally includes an integrated injection amount calculation unit 81 for each pump, a determination processing unit 82, a target injection amount determination unit 83, a storage unit 84 that stores the integrated injection amount, the target injection amount, and the like. .

(C) Binder injection process FIG. 6 is a flowchart of a binder injection process of the processing apparatus.
The flow rate (for example, 5 kg / min) and the target injection amounts Fset1 to Fset3 are set in advance by operating the operation unit 53e for each pump and input to the processing device 54a. The processing device 54a stores the set value input from each pump in the built-in storage unit 54, calculates the total value of the target injection amounts Fset1 to Fset3 as the total target injection amount Ft of the entire pump, and outputs the total target injection amount. Ft, a preset target pressure range HH to HL of the pump, and an increase rate β (for example, β = 1.5 times) of the consolidated material are stored in the storage unit 54 (step 101).
When the pumps are started in such a state, the respective pumps 53-1, 53-2, 53-3 are injected into the corresponding injection pipes 31-1, 31-2, 31 at the set flow rate and the target pressure. -3 starts and continues the injection (step 102).
The processing device 54a of the distribution control device 54 receives the flow rate signals Δf1, Δf2, Δf3 and the pressure signals P1, P2, P3 from each pump at predetermined time intervals (step 103), and the integrated injection amounts f1, f2, f3
f1 = f1 + Δf1
f2 = f2 + Δf2
f3 = f3 + Δf3
Is calculated and updated (step 104).

After that, it is monitored whether the total injection volume of all pumps has reached the target injection volume (step 105). If not, it is checked whether the pressure P1, P2, P3 of each pump has exceeded the maximum allowable pressure HH ( Step 106), if not, return to Step 102 and repeat the subsequent processing. However, if there is a pump that exceeds the maximum allowable pressure HH for some reason, the pump is immediately stopped for safety even if the integrated injection amount does not reach the target injection amount, and the integrated injection amount is stored in the storage unit. (Step 107). Next, it is checked whether all the pumps have stopped, that is, whether all pumps have stopped by injecting to the target injection amount or stopping after exceeding the maximum allowable pressure HH (step 108). Then, the injection control is terminated.
However, if there is an operating pump in step 108, the new target injection amount of the operating pump is recalculated (step 109). Thereafter, the processing after step 102 is performed to control the infusion amount of the operating pump to be the new target infusion amount. The method for recalculating the target injection volume will be described later, but the differential injection volume, which is the difference between the target injection volume of the stopped pump and the total injection volume, is evenly allocated to the operating pumps, and the total injection volume of all pumps is the total target volume. The injection amount is Ft.
On the other hand, if the total injection amount of all the pumps reaches the target injection amount in step 105, it is checked whether there is a pump whose pump pressure is equal to or higher than HL when the target injection amount is reached (step 110). If it exists, the pump can be considered to have normally injected up to the target injection volume, so that the pump is stopped and the integrated injection volume is stored in the storage unit (step 111). Next, check whether all pumps have stopped, that is, whether all pumps have stopped by injecting to the target injection volume or stopping beyond the maximum allowable pressure HH (step 112). Then, the injection control is terminated.

In step 112, if all pumps are not stopped and there is a pump in operation, or if there is no pump having a pump pressure of HL or higher in step 110, the total injection volume of the entire pump becomes the target total injection volume. (Step 113), the injection control is terminated if the total injection amount of the entire pump = the target total injection amount. However, if the total injection volume of the entire pump does not reach the target total injection volume in step 113, a new target injection volume of the working pump is recalculated (step 109). That is, if “NO” in step 113, the pressure of at least one of the pumps in operation is equal to or lower than the minimum required pressure HL, and there is a crack or the like in the ground corresponding to the pump, and the injected material escapes and the This means that the injection amount of the region remains insufficient. Therefore, in Step 109, the target injection amount is recalculated so as to compensate for the shortage of the injection amount by increasing the injection amount of the pump below the minimum necessary pressure HL. The amount is controlled to be the new target injection amount.
A method for recalculating the target injection amount will be described later. To summarize, the initial total target injection amount Ft is set to β (= 1.5) only when the total target injection amount has not been increased until then. The injection volume obtained by dividing the differential injection volume, which is the difference between the total target injection volume after the increase and the actual total injection volume of all the stopped pumps, by the number of active pumps. A new target injection amount is set.

FIG. 7 is a detailed process flow of step 109, that is, a process flow for determining and updating a new target injection amount of the operating pump.
The target injection rate is changed when the pump stops exceeding the maximum allowable pressure HH, or when the total injection rate of all operating pumps reaches the target injection rate, the pressure is below the minimum required pressure HL. It is determined whether the target injection amount is changed when at least one pump is present (step 201).
When changing the target injection volume when the pump stops exceeding the allowable maximum pressure HH, the target injection volume of the pump that has stopped due to high pressure is Fseti, the current total injection volume is fi, the number of pumps in operation Where n is the following formula: α = (Fseti−fi) / n (1)
(Step 202), the target injection amount of each operating pump is increased by α and the target injection amount of each operating pump is
Fsetj = Fsetj + α where j ≠ i (2)
(Step 203). Thereby, when the injection amount of a certain region is insufficient, the consolidated material can be supplied from the adjacent zone. That is, according to the present invention, the pressure of each pump at the time of injection and the integrated injection amount injected from each pump into each region are monitored, and the pump before the integrated injection amount from a predetermined pump reaches the target injection amount. When the pressure of the pump becomes higher than the allowable maximum pressure on the high-pressure side, the pump is immediately stopped and the target injection amount of the pump is increased during operation. It is possible to replenish the consolidated material from the pump adjacent to the region corresponding to, and good injection is possible over the entire length of the reinforced steel pipe.

On the other hand, in step 201, when the cumulative injection amount of all the pumps in operation reaches the target injection amount, if there is at least one pump whose pressure is lower than the minimum required pressure HL, the total target injection amount is set to the initial target injection amount. The total target injection amount Ft is increased by β (= 1.5) times (step 204). Next, calculate the total injection amount Fa of the pump that is stopped, and
Fset = (1.5 × Ft−Fa) / nn: Number of active pumps (3)
Fset is calculated by (step 205), and this Fset is set as the target injection amount of each pump being operated (step 206). By this. When the consolidated material escapes due to a crack or the like in a certain area, the amount of the consolidated material injected into the pump corresponding to the area can be increased to replenish the injected material, which is good over the entire length of the reinforced steel pipe. Injection is possible.

(D) Experimental results The fixed amount (target total injection volume for the total length of one reinforced steel pipe) is 125 kg / tube, and target injection volumes P1, P2, and P53 for each pump 53-1, 53-2, 53-3. P3 each
P1 = 42,0kg, P2 == 42,0kg, P3 = 41.0Kg,
The amount is increased only once and increased to 1.5 times (β = 1.5) (187.5Kg). Also,
Flow rate is 5Kg / min (can be increased to 7-8Kg / min depending on the situation),
Assume that HL = 0.5MPa and HH = 2.5MPa.
・ If all three units are within the target pressure range, do not increase the volume, but do a constant injection to the target injection volume.
・ If the pump stops even though the pressure reaches HH and the accumulated injection volume does not reach the target injection volume, the target injection volume is calculated according to equation (2) for each other pump by α calculated by equation (1). The injection is continued while the target total injection volume is maintained at 125 kg.
・ If the total infusion volume of the pump during operation has reached the target infusion volume and there is a pump whose pressure has not reached HL, the total infusion volume is set to 125 x 1.5 = 187.5 kg, and (3 The target injection amount of each pump is calculated so that the target injection amounts of the pumps during operation are equal by the equation (1). For example, if the pressure does not reach HL in all three units, 187.5Kg / 3 is set as the new target injection amount for each pump. Also, if only the pump 53-3 reaches the pressure HL and the pressure of the pumps 53-1 and 53-2 does not reach the HL, pump (187.5-41.0) /2=73.25 (kg) Set the new target injection amount of 53-1 and 53-2.

FIG. 8 shows the initial target injection amount of each pump, the target injection amount after change, and the final integrated injection amount when the pumping operation is performed according to the processing flow of FIG. 6 and FIG. It is a chart which shows (discharge flow rate). In addition,
(1) is the control result during normal operation when each pump 53-1, 53-2, 53-3 (referred to as P1, P2, P3) is automatically stopped at a fixed quantity.
(2) is the control result when P3 stops when the pressure exceeds HH before quantification, and the unreached portion is distributed to the other two units.
(3) is the control result when stopping at HH or higher in the order of P2 → P3,
(4) is the control result when P1, P2, and P3 reach a fixed amount and the pressure does not reach HL and the volume is increased.
(5) is the control result when the pressure is increased when P1 and P2 reach the fixed amount and the pressure is less than HL and only P3 is HL or higher.
(6) is the control when the pressure of P2 becomes HH or higher when P1 and P2 reach a fixed amount and the pressure is less than HL and only P3 is HL or higher and P1 and P2 are injected more than H1. result,
(7) is the control result when P1 and P2 both reach the fixed amount and the pressure increases without reaching HL after P3 stops at HH or higher, and then stops when P2 reaches HH or higher.
(8) is the control result when P3 is HH or higher and the pressure is less than HL when P1 reaches the fixed value and P2 is HL or higher after stopping.

As described above, according to the present invention, the pressure of each pump at the time of injection and the integrated injection amount injected into each region from each pump are monitored, and the pump before the integrated injection amount from a predetermined pump reaches the target injection amount. When the pressure of the pump becomes higher than the allowable maximum pressure on the high-pressure side, the pump is immediately stopped and the target injection amount of the pump is increased during operation. It is possible to replenish the consolidated material from the pump adjacent to the region corresponding to, and good injection is possible over the entire length of the reinforced steel pipe.
In addition, when the consolidated material escapes due to a crack or the like in a certain region, the amount of the consolidated material injected into the pump corresponding to the region can be increased to replenish the injected material, and the entire length of the reinforcing steel pipe can be increased. Good injection is possible.
In the above description, when the pressure of the pump becomes higher than the allowable maximum pressure on the high pressure side before the integrated injection amount from the predetermined pump reaches the target injection amount, the target injection amount and the integrated injection amount of the pump In the above description, the target injection amount of the operating pump is increased by evenly assigning the differential injection amount that is the difference between the operating pumps, but there is one operating pump adjacent to the pump whose pressure is higher than the set pressure. In some cases, the differential injection amount may be assigned only to the adjacent pump, and when there are two adjacent active pumps, the differential injection amount may be equally assigned to the two adjacent pumps.

21 face 22 shotcrete 23 secondary lining concrete 24 support 25 shotcrete 26 long tip receiving steel pipe (reinforced steel pipe)
27 Consolidation region 28 Fiber reinforcement tube 29 Consolidation region
31-1, 31-2, 31-3 injection tube
35-1, 35-2, 35-3 Junction pipe 50 Consolidation material injection device 51 A liquid feeder 52 B liquid feeder
53-1, 53-2, 53-3 Pump 54 A distribution control device 54 is provided.
61-1, 1, 21-2, 61-3 injection hose

Claims (2)

The periphery of the entire length of the reinforcement pipe placed in the ground is divided into a plurality of zones, and a plurality of injection pipes having openings at positions corresponding to the respective zones are inserted into the reinforcement pipes, and are fixed from the pump through the respective injection pipes. In the consolidated material injection method of injecting the binder into the reinforcing tube and ejecting the consolidated material to each zone around the reinforcing tube from the discharge hole formed in the reinforcing tube to form a consolidated region,
Set the target injection volume for each pump and the total target injection volume for all pumps,
Monitor the pressure of each pump at the time of injection and the total injection amount injected from each pump to each zone,
If the pressure of the pump when the cumulative injection amount from the predetermined pump reaches the target injection amount is higher than the necessary minimum pressure on the low pressure side, the pump is stopped as being normally injected,
When the pressure of the pump becomes higher than the allowable maximum pressure on the high pressure side before the integrated injection amount from the predetermined pump reaches the target injection amount, the pump is immediately stopped and the integration with the target injection amount of the pump is performed. Assigning a differential injection volume, which is the difference from the injection volume, to the active pump to increase the target injection volume of the active pump;
When the total injection volume from each differential pump reaches the target injection volume, if the pressure of at least one pump is lower than the required minimum pressure on the low-pressure side, or if the total target injection volume has not been increased until then As long as the total target injection amount is increased, the injection amount obtained by dividing the differential injection amount, which is the difference between the increased total target injection amount and the actual total injection amount of all the stopped pumps, by the number of operating pumps Is the target injection volume of each active pump,
A method for injecting a binder, characterized in that Dividing the peripheral part of the full length of the reinforcement pipe placed in the ground into a plurality of zones, inserting a plurality of injection pipes having openings at positions corresponding to the respective zones into the reinforcement pipes, and passing through each injection pipe to a consolidated material In the consolidation material injecting device for forming a consolidated region by injecting the consolidated material into each zone around the reinforcement tube from the discharge hole formed in the reinforcement tube.
An injection amount signal and pressure are provided corresponding to each of the injection pipes, injecting the consolidated material into the reinforcing tube through the injection tube, and detecting the injection amount of the consolidated material injected into the injection tube and the pressure of the pump. A pump that outputs a signal,
A setting unit for setting the target injection amount of each pump and the total target injection amount of all pumps;
Integrated amount calculation means for calculating the pressure of each pump at the time of injection and the integrated injection amount injected from each pump into each zone;
If the pressure of the pump when the cumulative injection amount from the predetermined pump reaches the target injection amount is higher than the necessary minimum pressure on the low pressure side, the pump is stopped as a normal injection and the predetermined pump is stopped. Pump control means for immediately stopping the pump when the pressure of the pump becomes higher than the allowable maximum pressure on the high-pressure side before the integrated injection amount from the pump reaches the target injection amount;
(1) When the pump pressure becomes higher than the allowable maximum pressure on the high-pressure side before the cumulative injection amount from a given pump reaches the target injection amount, the difference between the target injection amount and the cumulative injection amount of the pump Is assigned to the operating pump to increase the target injection amount of the operating pump, and (2) at least when the cumulative injection amount from each differential pump reaches the target injection amount, respectively. When the pressure of one pump is lower than the required minimum pressure on the low pressure side, the total target injection amount is increased only when the total target injection amount has not been increased until then, and the total target injection amount after the increase is stopped. Target injection amount changing means for setting the injection amount obtained by dividing the differential injection amount, which is the difference from the actual total injection amount of all the pumps, by the number of active pumps, and the target injection amount of each active pump;
An apparatus for injecting a binder, comprising:

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