JP3353190B2 - Branching device for concrete placing pipe, concrete placing device, and concrete placing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branching device provided in a concrete casting pipe for placing concrete in reverse, a concrete placing device using the branching device, and a concrete casting method.

[0002]

2. Description of the Related Art Conventionally, when a skeleton is to be sequentially constructed downward from a previously constructed skeleton on the ground side, a formwork is assembled in a digging space while being connected to an upper precedence skeleton, and concrete is formed here. (Reinforced concrete) is press-fitted and integrated with the preceding building. FIG. 18 shows the concrete casting state of the skeleton wall and the formwork A.
In the casting of the back-casting concrete on the frame wall, openings (not shown) are formed at predetermined pitches P (usually, one location per span) near the upper portion of the formwork A, and curing openings (various types) are formed on the openings. (For example, there is a sliding shutter). Then, the tip of a concrete casting pipe (usually a hose and a pipe connected) C connected to a pump car is connected (usually using a Victoria joint), and the curing lid B is opened. The concrete is poured. When a predetermined amount of concrete has been cast from one location, the curing lid B is closed, the tip of the tube is removed, the concrete casting pipe C is cut off, and the concrete is replaced so as to correspond to the next opening. Repeating this process, the concrete is poured. In the drawing, a indicates the upper edge of the concrete.

[0003]

When constructing an underground wall by the above-described reverse driving method, it is difficult to drive the vehicle by a boom vehicle because the upper part of the formwork is not opened. Therefore, the concrete casting pipe, which is piped along the length direction of the formwork, is cut with one side while cutting. In order to prevent the occurrence of a cold joint, only a relatively small-scale casting can be performed. For this reason, a method is usually adopted in which the striking is performed by single-pressing from the beginning without performing stratification. When the underground wall becomes thicker, it is necessary to perform stratification. However, for the placement performed in multiple layers in the height direction, time management (needs to be performed in about 30 to 40 minutes per layer) Considering the surface, piping, tube tip refilling time, and the like, stratification of back-cast concrete itself becomes impossible. Further, if concrete placement is frequently interrupted due to piping, refilling, or the like, construction troubles such as blockage of pipelines are likely to occur. In addition, it takes time and effort to treat the remaining concrete at the time of completion of the casting, and it is necessary to treat the remaining concrete due to piping and refilling, which has been a particular problem in underground construction.

[0004] On the other hand, in the construction of an underground structure by forward striking instead of reverse striking, such as concrete pouring when constructing an underground tank side wall, a plurality of branch paths are provided in a delivery path through which concrete is fed and flows. An automatic setting device is used in which concrete is cast from each of the branch paths, and a concrete valve is used at a branch point from the delivery path to the branch path. For this reason,
It is conceivable to cast back-cast concrete by the above-described filling method of casting from each of the branch routes that branch off from the delivery route. FIG. 19 and FIG. 20 show a concrete valve D in the above-mentioned automatic casting apparatus, and the concrete valve D is shown in the form of a single pipe in the example of the drawing. This is a shutter type in which a branch pipe F is branched from E through a square portion, and a shutter G is inserted into and removed from the square branch portion to open and close the branch tube F.

[0005] As shown in the figure, in the apparatus in which the concrete valve D is provided at the branch portion, the discharge port side of the delivery pipe E is always open regardless of whether the shutter G opens and closes the branch pipe F. . When the concrete is poured by increasing the internal pressure of the casting pipe for casting the above-mentioned reverse-casting concrete, a large force is applied to push the flat shutter in its thickness direction. There is a high possibility that troubles such as inability to open and close will occur, and this cannot be adopted. Further, at the branch portion from the delivery pipe to the branch pipe, there is a rectangular portion in the pipe shape in the sectional direction of the delivery pipe, which is different from the circular shape of the general pipe section, and thus has the following problem. That is, at the time of placing concrete in reverse, at the end of concrete placing, a spherical or cylindrical sponge ball is fitted into the pipeline, and the remaining concrete is discharged to the ground while pushing the sponge ball by water pressure feeding. However, if there is a branch in the above structure, the sponge ball is caught and a problem arises that washing cannot be performed.

In view of the above circumstances, the present invention makes it possible to appropriately switch the delivery direction of the concrete to be pumped, and to prevent a sponge ball used for washing a pipe after casting from being caught at a pipe branch portion. The objective is to form a plurality of branch paths in the concrete casting pipe to the concrete casting area so that stratification can be performed with back-cast concrete, and the pipes can be cleaned properly. The purpose is to be carried out.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a first invention thereof is a branching device for concrete casting pipe in which a branch pipe is branched from a concrete delivery pipe. Then, a substantially trough-shaped valve body conforming to the inner surface shape of the delivery pipe is located at a branch portion between the delivery pipe and the branch pipe, and from the closed position crossing the longitudinal direction of the delivery pipe, the delivery pipe inner surface A branch for concrete casting pipe, comprising: a valve body operating means for rotating the valve body to switch the concrete delivery direction by rotating the valve body to a closed position for closing the branch pipe flush with the branch pipe. Device.
And the second invention is a concrete casting pipe having a plurality of branch pipes branched from a delivery pipe along a form corresponding to a plurality of connection means located on the form, and the delivery pipe and a branch. A concrete casting pipe branching device provided at a branch portion with a pipe; and a control means for controlling a concrete delivery direction switching operation of each of the branching devices. A concrete placing device which is provided so that the delivery direction of the concrete to be sent in can be switched at each of pipe branch portions of the delivery pipe and the branch pipe. This is to solve the above problem. Further, a third invention is a casting method using the above concrete casting device, wherein the branch pipe on the upstream side in the concrete delivery direction is provided by a required amount of concrete to be fed into concrete pipes of the concrete casting device. From the downstream branch pipe, or from the downstream branch pipe to the upstream branch pipe in the concrete delivery direction, and stratify the concrete in the concrete placing area. Thus, the above problem is solved.

[0008]

[Function] In the branching device for concrete casting piping,
The valve body is moved by the valve body operating means in a range from the closed position of the delivery pipe to the closed position of the branch pipe, and when the valve body is in the closed position of the delivery pipe, the side of the branch pipe is opened. When the valve element is in the closed position of the branch pipe, the branch pipe is closed and the delivery pipe is opened. In the concrete casting device, since the concrete delivery direction can be switched at each pipe branch where the branch pipe is split, the open / close state of each pipe branch is set so that concrete is sent to the specific branch pipe side. It can be set and combined. Since the required amount of concrete is sent to each branch pipe in order in the casting method using the above concrete casting device, the same amount of concrete flows into the formwork from each distributed pipe and is stratified. Becomes

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. In the drawing, reference numeral 1 denotes a concrete casting pipe branching device provided at a branch portion between a delivery pipe and a branch pipe in a concrete casting device to be described later, which has a shape in which a branch pipe 3 branches from a delivery pipe 2 in a direction orthogonal thereto. It uses a tube material and is configured as one unit H integrally provided with the delivery pipe 2 and the branch pipe 3 (FIG. 1).
A plurality of the units H are arranged along the concrete form as described later, and the discharge pipes 2 are extended along the concrete form by connecting the discharge pipes 2 through a fixed-length connecting pipe or the like. The connecting pipe is connected to the branch pipe 3 of the unit H in the same manner, so that the branch pipe 3 is extended to the formwork side.

The branching device 1 comprises a valve body 4 and valve body operating means 5
It consists of: As shown in FIGS. 3 and 4, the opening 3 a of the branch pipe 3 facing the delivery pipe 2 side is the discharge side of the delivery pipe 2 in the concrete delivery direction X (downstream of the concrete delivery direction). A shaft body 40 is pivotally supported at the opening end, and the substantially trough-shaped valve body 4 is attached to the shaft body. The valve body 4 moves with the rotation of the shaft body 40, that is, the shaft body 40. Are provided so as to be rotatable around the central axis of the. The valve element 4 rotates in a rising direction and can move to a closed position 4 ′ (FIG. 4) in the delivery pipe 2 so as to intersect the longitudinal direction of the delivery pipe 2, and the closed position 4 ′. When the valve element 4 is located at the position, the concrete that is fed in is sent out to the branch pipe 3 side as described later, and the feeding of the concrete to the discharge side (X direction) of the delivery pipe 2 is stopped. As shown in FIG. 4, at the closed position 4 ′, a gap is formed between the tip of the valve body 4 and the inner surface of the delivery pipe 2. At the time of contact with 4 ′), aggregates in concrete are fitted into this gap, and as a result, the gap is closed and the discharge pipe 2 discharge side is completely closed. That has been confirmed. Conversely, when the valve element 4 is in the closed position 4 ', the delivery pipe 2
If the inside is completely closed, the closed position 4 '
When pivoting to the position, the aggregate may be bitten on the distal end side of the valve body 4, in which case excessive stress is applied to the shaft body 40,
There is a disadvantage that the shaft body 40 is broken (the spindle 41 passing through the center of the shaft body is broken). In addition, concrete will be sent out to the branch pipe while hitting the valve body that fully closes the delivery pipe, and the valve body itself will be pushed and will be firmly fitted into the delivery pipe. . Thus, the gap formed between the valve element 4 and the inner surface of the delivery pipe 2 at the closed position 4 'plays a useful role.

When the shaft body 40 is rotated and the valve body 4 is lowered, and is in a closed position 4 ″ (FIG. 3) which is parallel to the length direction of the delivery pipe 2, the valve body 4 is in the open portion of the branch pipe 3. As described above, the cross-sectional shape of the portion where the valve body 4 is substantially trough-shaped and the opening portion 3a is fully closed has the same shape as the general cross-sectional shape of the delivery pipe 2 as described above. And is provided so as to be flush with the inner peripheral surface of the delivery pipe 2. As described above, when the valve body 4 is at the closed position 4 ", the branch pipe 3 is provided.
Is completely closed, and the concrete is discharged to the discharge side (X direction). In addition, the valve body 4 is in the closed position 4 ″.
Because the inside shape of the tube when there is a circular shape with a general cross-sectional shape, the sponge ball 17 (which is made of an elastic material and is a sphere or a cylindrical plunger fitted into the delivery tube) described later is also fed. This allows the sponge ball to pass without being caught by the valve body.

The shaft body 40 to which the valve body 4 is attached has a substantially continuous shape as shown in FIGS. In order to rotatably support the shaft body 40 and to prevent leakage of concrete or pipe washing water (described later) from around the shaft body 40, as shown in FIG. A case 42 having a corresponding opening and opened in a tapered shape is welded across the delivery pipe 2 and the branch pipe 3, and a substantially mountain-shaped packing whose top surface is in sliding contact with the periphery of the shaft body 40 in the case 42. 43
And the cover plate 45 is attached to the case 4 via the steel plate 44.
It is attached to 2. Then, the steel plate 44 is pushed up by adjusting the screwing of a bolt 46 screwed into the center of the cover plate 45, the peripheral surface of the packing 43 is brought into contact with the inner surface of the case 42, and the top surface is brought into contact with the peripheral surface of the shaft body 40. By contacting, the concrete leakage and the washing water leakage are prevented. Since the case 42 is tapered and the packing 43 has a substantially mountain shape, it is possible to easily push in the joint surface to be dense. Like that.

The valve operating means 5 comprises a pair of arms 50 connected to the shaft 40 of the valve body 4 connected to an actuator device 52 for allowing a piston rod 51 to be moved in and out. By the operation of the operating means 5, the valve body 4 is supported so as to rotate between the closed positions 4 'and 4 "and stop at the closed positions 4' and 4" (FIG. 1).
4). FIG. 6 shows a cushioning mechanism provided in an arm receiver 53 (between the arms 50) with which the piston rod 51 is engaged. A spring 54 wound around the tip of the piston rod 51 is attached to the piston rod 51. This can be received by the seat plate 55.
That is, when the piston rod 51 is retracted (4 ′ →
4 ”), the tip of the piston rod 51 rotates the arm 50 via the arm receiver 53. When the piston rod 51 is pushed out (4 ″ → 4 ′), the seat plate 55 and the spring 54 The arm 50 is rotated via an arm receiver 53 (which can contact the spring). When the piston rod 51 is pushed out (4 ″ → 4 ′) and the valve body 4 bites a large aggregate, excessive force is applied to the shaft body 40 by the contraction of the spring 54. They are trying not to join.

The valve operating means 5 of the branching device 1 is a mechanism for rotating the arm 50 by an actuator device 52 so as to be compatible with remote control, but the valve operating means 5 is not limited to this. 7A and 7B show other examples. That is, the valve operating means 5 is connected to the shaft 4
0 can be constituted by a lever 56 connected so as to be orthogonal to the center direction thereof, and the valve body 4 is rotated by manually rotating the lever 56. is there.

As described above, in the branching device 1, the valve element 4 can be located at the two closed positions 4 'and 4 ", and the valve element 4 is in the raised state (as described above). When the discharge side is closed due to clogging of the concrete at the valve body tip side), the branch pipe 3 is opened, and when the delivery pipe 2 is open, the branch pipe 3 is closed to change the concrete delivery direction. It can be switched to either one.

FIG. 8 schematically shows the state of use of the concrete placing device 6 having the above-described branching device 1, and concrete driving from the pump truck I on the ground to the form A assembled on the underground. Installation pipe 7 and the branching device 1 incorporated in a branch portion of the concrete casting pipe 7.
And control means 9 for controlling the operation of the branching device 1. In the concrete casting pipe 7 in which concrete is pumped from the pump car I, a plurality of the units H are connected with a required pipe interposed therebetween, and the delivery pipe 2 is extended along the form A.
The branch pipe 3 corresponds to a curing lid provided at a predetermined interval on the mold A, and the branch pipe 3 is connected to the curing lid. As shown in the figure, the tip of the concrete casting pipe 7, that is, the tip of the delivery pipe 2 on the discharge side is connected to the curing lid using a curved pipe or the like. FIG. 9 shows the disposition state of the delivery pipe 2. The delivery pipe 2 is passed over a support base 8 composed of a framed scaffold or the like assembled along a form A, and The unit H is arranged, and the branch pipe 3 extends from the unit H toward the curing lid B and is connected thereto.

Each of the branching devices 1 configured as a unit H is connected to the control means 9, which individually controls the operation of each of the branching devices 1, and controls the operation of the above-described valve element. It is provided so that the concrete sending direction can be switched. FIG. 8 illustrates a concrete placing device 6 that employs a type in which the branching device 1 operates by hydraulic operation.
The control means 9 is also provided with a hydraulic unit 10 under control. The control unit 9 controls the operation of the branch device 1 by adjusting the hydraulic pressure via the hydraulic unit 10, and each operation is monitored by the control means 9. , And also controls the operation of the concrete sending source. As described above, in the concrete placing device 6, the concrete that is pressure-fed can be switched in the unit H to the delivery direction X of the delivery pipe 2 and the branch pipe 3 side.
By selecting the opening and closing of the valve body in the unit H,
The concrete can be sent into the appropriate branch pipe 3 and poured into the formwork A. In the concrete placing device 6, a manual operation of selectively manually operating each of the branching devices 1 remotely by the control means 9 is possible, and the concrete delivery information (for example, the number of piston strokes) from the pump car I is transmitted. The automatic operation of remotely operating the plurality of branching devices 1 in a predetermined order while receiving the control means 9 is enabled.

An example of a casting method using the concrete casting device 6 will be described with reference to FIG. The delivery pipe 2 of the concrete placing device 6 has nine branching devices 1a to 1i from the downstream side in the concrete delivery direction X, and nine branching tubes 3a to 3i are connected to the curing lid side of the formwork. Shall be And the concrete sending direction X
Is connected to the curing lid side of the mold. (Step 1) Washing with water is performed in a state where the branch pipe side of each of the branching devices 1a to 1i is opened (differing the inside of the pipe unlike washing). The following operations of the branching devices 1a to 1i are performed by manual operation. After confirming the outflow of water through the branch pipe 3i in the branch apparatus 1i, the branch pipe 3i is closed by the branch apparatus 1i. Branch pipe 3 with branch device 1i
When i is closed, the water advances in the concrete delivery direction X opened by the branching device 1i and reaches the branching device 1h. After confirming the outflow of water through the branch pipe 3h in the branch apparatus 1h, the branch pipe 3h is closed by the branch apparatus 1h. When the branch pipe 3h is closed by the branching device 1h, the water advances in the concrete delivery direction X opened by the branching device 1h and reaches the branching device 1g. In this way, the branch pipe side is sequentially closed from the branching device located on the upstream side in the concrete delivery direction X, and finally, the inside of the concrete casting pipe is wet by flowing water from the tip of the delivery pipe 2.

(Step 2) The mortar is fed under pressure with the branch pipe side of each branching device opened. The operation of the branching device is a manual operation. In the same manner as in the above step 1, while confirming the flow of mortar from the branch pipe, the branch pipe side is sequentially closed from the branching devices 1i to 1a located on the upstream side in the concrete delivery direction X, and finally the delivery pipe is closed. A mortar film is formed on the inner wall surface of the concrete casting pipe so that the mortar flows out from the tip of No. 2. (Step 3) After confirming that the mortar has flowed out from the tip of the delivery pipe 2, the mode is switched to automatic operation. The amount of the mortar pumped from the pump truck is calculated in advance, and concrete is continuously pumped after the mortar. For this reason, at the time when the mortar can be confirmed to flow out from the tip of the delivery pipe 2, the concrete is being pressure-fed to the concrete casting pipe.

(Step 4) At the time of switching to the automatic operation, the branching devices 1a to 1i operate as described above to open the branch pipe side (close the delivery pipe side). While the control means 9 captures the concrete delivery information (for example, the number of piston strokes) from the pump car I, a set amount of concrete calculated based on the concrete delivery information is passed from the branching device 1i to the branch pipe 3i. When a set amount of concrete is injected, the branching device 1
i is provided so as to close the branch pipe 3i. When the branching device 1i closes the branch pipe 3i, the concrete is sent to the branching device 1h. The branching device 1h also maintains the closed state of the delivery pipe 2 under the control of the control means 9 until the predetermined amount of concrete is pressed into the formwork through the branch pipe 3h, and the predetermined amount of concrete is removed. The branch pipe 3h is provided so as to close when press-fitted. In this way, every time a predetermined amount of concrete is pumped, the branch pipe is closed by operating it from the branching device on the upstream side in the concrete delivery direction X. Concrete is distributed by a fixed amount, and one layer of concrete is poured. Until the required amount of concrete is pressed into the formwork side from the leading end of the delivery pipe 2, the closing state of the branch pipes 3a to 3i by the branching devices 1a to 1i is maintained. When a predetermined amount of concrete is injected, each of the branching devices 1a to 1i operates so as to open the branch pipes 3a to 3i (this causes the delivery pipe of each unit to be closed). Then, the required amount of concrete is again pumped into the formwork from the branch pipe on the upstream side in the concrete delivery direction X to perform stratification, and the stratification is automatically performed to the set placement height (below the final layer). It is to be repeated by driving.

(Step 5) When the stratification of the lower layer of the final layer is completed, the automatic operation is terminated, and the stratification of the final layer is performed by a manual operation. In the stratification of the final layer, while the concrete pump of the pump car is in a low-speed motion, concrete is press-fitted from the upstream branch pipe in the concrete delivery direction X in the same manner as described above, and concrete from the leading end of the delivery pipe 2 is pressed. When the press-fitting of the final layer is completed, the casting of the final layer is completed. When the casting of the final layer is completed, each branch pipe 3a
Attach a blind lid to the outlet of ~ 3i. (Step 6) Washing of the concrete casting pipe 7 is performed by removing the tip of the delivery pipe 2 from the curing lid, inserting a sponge ball into the pipe, and sending water under pressure from the tip of the delivery pipe 2 (each branching device is branched). The pipe side is closed), and the residual pressure in the pipe is returned to the above-ground part side by this water pressure feeding. At the time of cleaning the inside of the pipe, in the concrete casting device 6, since the valve body of the branching device covers the opening of the branch pipe and unifies the inside of the pipe into a circular shape, the sponge ball does not catch. (Step 7) The washing water is collected and the concrete placing operation is completed.

FIG. 11 to FIG. 13 show the washing of the pipes with respect to the steps 6 and 7. FIG. 11 shows a state in which the casting of the final layer is completed and the cleaning of the pipes is started. Each branch pipe cut off from the curing lid side is closed by a lid member (blind lid). b is residual concrete in the pipe. Next, as shown in FIG. 12, a sponge ball 17 is fitted on the most distal side of the delivery pipe 2, and the sponge ball 17 is hydraulically fed. The remaining concrete c is collected on the ground side by moving the sponge ball 17. c indicates washing water. After the residual concrete has been sent out, the valve elements 4 in each unit H are individually moved well with the washing water being filled in the pipes as shown in FIG. 13, and the inside of the branch pipe 3 is also washed with the washing water c. To do. Then, the washing water c is collected as described above.

In the order of the concrete placing method described above, concrete is divided and fed from the upstream side in the concrete delivery direction. However, the present invention is not limited to this, and concrete is divided and fed from the downstream side. It may be.

An important point in the case of the above-described casting by the reverse injection of concrete is to cast a dense concrete which is in close contact with the upper body constructed in advance. That is, the timing of stopping the concrete to be pressed is determined by experience (based on the swelling of the mold material, generation of abnormal noise, changes in the pumping pressure, etc.), and the concrete placing pipe is forcibly forced by a human being with a pin valve or the like. However, it is unlikely that concrete injection can be stopped when appropriate. Therefore, in addition to the concrete placing device and the placing method, a system capable of appropriately stopping the press-fitting of the back-cast concrete is proposed. FIG. 14 schematically shows a configuration of a casting management device 11 applied to the concrete casting device. The casting management device 11 is provided with an inspection port 1 provided at the end of the delivery pipe 2 and the form side connection port 12 of the branch pipe 3 shown in FIG.
3, a pressure detecting means 14 which can be attached to and detached from the pressure detecting means 3, a judging means 15 which compares a signal value from the pressure detecting means 14 with a set value and performs a required output (described later), and receives an output from the judging means 15. And a display output means 16 which operates in the following manner.

The pressure detecting means 14 detects the pressure of the press-fitted concrete at the form side connection port 12, converts the pressure into a signal value and outputs the signal value. As shown in FIG. A sensor 14a composed of, for example, a gauge type pressure transducer is incorporated in a lid 13a which is attached to and detached from the mouth 13, so as to face the concrete to be pressed. When the signal value from the pressure detecting means 14 is equal to or more than a set upper limit (upper limit set pressure value), the determiner 15a performs an upper limit contact output 15b by the determiner 15a, and the lower limit (lower limit) at which the signal value is set. When the pressure is equal to or more than the set pressure value and less than the upper limit, the lower contact output 15c is performed. When there is the upper limit contact output 15b, the display output means 16 performs an abnormality display 16a due to a blinking operation of a light source and an alarm generation operation, and sends a concrete pump stop signal 16b. The stop signal transmission 16b is preferably transmitted in a wireless format, but is not limited to this. Then, when the lower limit contact output 15c is present, an abnormality display 16c is performed by a blinking operation of the light source.

The reason why the upper limit and the lower limit are set in advance in the placing management device 11 is that when the concrete pump is press-fitted, the concrete pressure is pulsating due to the movement of the piston, and the fluctuation of the pulsating pressure is within the required pressure range. This is because they try to hit the concrete when it starts to take place. As shown in FIG. 17, in the final stage, the pressure d of the press-fitted concrete rises while fluctuating in a pulsating state. e is a limit value of formwork strength,
f is a value that satisfies a sufficient condition of the press-fitting pressure. Then, the upper limit and the lower limit (the range between the upper limit and the lower limit is equal to or more than the fluctuation width of the pulsating pressure) are determined within this range in the casting management device 11, and the pressure of the injected concrete exceeds the lower limit and reaches the upper limit. The completion of press-fitting is known by two detection signals.

As described above, the pressure of the concrete to be press-fitted is detected by using the casting control device 11 at the time of the press-fitting of the reverse-casting concrete, and when the detected value exceeds the upper limit set value. Since the concrete pump is automatically stopped at the time, the concrete can be stopped when the pressure reaches an appropriate pressure. In the above-mentioned placing management device 11, a stop signal of the concrete pump is automatically sent out.
A stop signal may be sent out from the placing management device 11 by manual operation. FIG. 15 shows a state in which the above-mentioned placement management device 11 is used when the above-mentioned final layer is placed.
With the pressure detecting means 14 connected to the end of the pipe 3 and the connection port 12 (inspection port 13) of the branch pipe 3, the worker holds the placing management device 11 so that the start of the concrete pump can be operated by the hand switch 16d. I have to. First, the pressure detection means 14 (sensor) is connected to the inspection port 13, and a start signal is transmitted by the hand switch 16d to start the concrete pump (start of press-fitting). The yellow lamp blinks (abnormal display 16c) when the press-in pressure gradually rises and exceeds the lower limit set pressure value (0.3 kg / cm 2). Next, the upper limit set pressure value (0.6 kg / cm2)
The red lamp blinks (abnormal display 16a) when exceeding, and at the same time, a stop signal is transmitted and the concrete pump stops. The specific numerical values of the upper limit set pressure value and the lower limit set pressure value are not limited.

[0028]

As described above, according to the branching device for concrete casting pipe of the present invention, the branching device for concrete placing pipe is formed by branching a branch pipe from a concrete delivery pipe. By positioning a substantially gutter-shaped valve body that matches the inner surface shape of the delivery pipe and the branch pipe, from a closed position that intersects the longitudinal direction of the delivery pipe,
Valve body operating means for flush with the inner surface of the delivery pipe and rotatably provided to a closed position for closing the branch pipe, and turning the valve body to switch the concrete delivery direction. . Since the valve element can be moved in the range from the closed position of the delivery pipe to the closed position of the branch pipe in this way, by selecting the two closed positions of the valve element, it is possible to switch the concrete delivery direction. become able to. And, since it is to close either one of the delivery pipe and the branch pipe, it is possible to send out the concrete while maintaining the press-fitting pressure properly,
This branching device can be used when placing backcast concrete which is to be press-fitted. Further, unlike the conventional slide type concrete valve, the inside of the pipe where the branching device is provided can be made the same circular shape as the general pipe, so that the sponge ball used for pipe cleaning can be prevented from being caught. it can.

Further, another concrete casting device according to the present invention is a concrete casting device having a plurality of branch pipes that are branched from a delivery pipe along a mold in accordance with a plurality of connecting means located on the mold. A pipe, a concrete casting pipe branching device provided at a branch portion between the delivery pipe and the branch pipe, and control means for controlling a concrete delivery direction switching operation of each of the branching devices. The delivery direction of the concrete that is press-fitted and sent into the concrete casting pipe is provided to be switchable at each of the pipe branch portions of the delivery pipe and the branch pipe. In this way, it becomes possible to cast concrete into the form by a predetermined amount from each of the branch pipes branching from the delivery pipe, and to replace the conventional concrete casting pipe by setting the branch pipes to be cast in order. It is possible to easily perform stratification with back-cast concrete.

According to still another casting method of the present invention, a predetermined amount of concrete to be pumped into the concrete pipe of the concrete casting device is transferred from the branch pipe on the upstream side in the concrete delivery direction to the branch pipe on the downstream side. Or, it is characterized by layering concrete in the concrete placing area by sequentially feeding from the downstream branch pipe to the upstream branch pipe and replacing the pipe in the conventional reverse cast concrete. Since the stratification is performed without any stratification, it is possible to cast a large-scale wall with back-casting concrete. Further, since it is not necessary to change the pipe as described above, it is only necessary that the residual concrete treatment at the time of placing is not performed once after the completion of the placing. Further, since the work of replacing pipes and the work of processing the remaining concrete are reduced, labor and the like can be reduced, and the dirt work at the time of casting is extremely reduced, so that the environment of the work site can be improved satisfactorily. Then, when the pressure of the concrete to be pressed is stopped at a point when the pressure of the concrete is equal to or more than a predetermined value, the press-in of the concrete more than necessary is prevented, and it is possible to properly adhere to the preceding body,
High-quality casting of reverse-cast concrete can be performed, and in addition, troubles such as breakage of the formwork and blockage of the pipeline due to excessive press-fitting can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a branching device for concrete casting pipe according to the present invention from the side.

FIG. 2 is an explanatory view showing one embodiment of a branching device from a concrete discharge side.

FIG. 3 is an explanatory view showing a closed state of a branch pipe by a valve body.

FIG. 4 is an explanatory view showing a state where a branch pipe side is opened.

FIG. 5 is an explanatory view showing a shaft body and a seal structure supporting the shaft body.

FIG. 6 is an explanatory view showing a buffer mechanism in the valve body operation means.

FIGS. 7A and 7B show valve operating means having a structure in which the valve is rotated manually, wherein FIG. 7A is an explanatory view showing a state viewed from above, and FIG. FIG.

FIG. 8 is an explanatory view schematically showing a use state of an embodiment of the concrete placing device.

FIG. 9 is a view showing a supporting state of the delivery pipe in one embodiment of the concrete placing device, wherein (a) is an explanatory view showing a state viewed from a direction facing the formwork, and (b) is a view from the concrete delivering direction. It is explanatory drawing which shows the state which looked at.

FIG. 10 is an explanatory view schematically showing one embodiment of a concrete placing device.

FIG. 11 is an explanatory diagram showing a state before cleaning of a pipe.

FIG. 12 is an explanatory diagram illustrating a state in which a sponge ball is being pressure-fed.

FIG. 13 is an explanatory diagram showing pipe cleaning.

FIG. 14 is an explanatory diagram showing a configuration of a casting management device.

FIG. 15 is an explanatory diagram showing a use state of the placing management device.

FIG. 16 is an explanatory view showing attachment of a pressure detecting means in the casting management device.

FIG. 17 is an explanatory diagram showing fluctuation of pressure of press-fitting concrete due to pulsation.

18 (a) and 18 (b) are views showing a state where the concrete is viewed from the direction facing the formwork, and FIG. 18 (b) is a view which shows the state when viewed from the concrete delivery direction. FIG.

FIG. 19 is an explanatory view showing a conventional concrete valve from the side.

FIG. 20 is an explanatory view showing a conventional concrete valve in which a branch portion is cut away.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Concrete casting pipe branching device 2 ... Delivery pipe 3 ... Branch pipe 4 ... Valve body 5 ... Valve body operating means 6 ... Concrete casting apparatus 7 ... Concrete casting pipe 9 ... Control means 11 ... Casting management apparatus 14 ... pressure detecting means 15 ... determining means 16 ... display output means X ... concrete sending direction

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Teruaki Ohashi 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Corporation (58) Field surveyed (Int. Cl. ⁷ , DB name) E04G 21 / 04 E02F 7/10 F16K 1/20 F16K 1/22 B08B 9/06

Claims (4)

(57) [Claims] 1. A branching device for concrete casting piping in which a branch pipe is branched from a concrete delivery pipe, wherein a substantially gutter-shaped valve element conforming to an inner surface shape of the delivery pipe is provided between the delivery pipe and the branch pipe. The valve body is rotatably provided from a closed position intersecting the longitudinal direction of the delivery pipe to a closed position that is flush with the inner surface of the delivery pipe and closes the branch pipe. A branching device for concrete placing pipes, comprising a valve body operating means for switching a concrete delivery direction. 2. A concrete casting pipe having a plurality of branch pipes branched from a delivery pipe along a form corresponding to a plurality of connection means located on the form, and a concrete casting pipe having a plurality of branch pipes. 2. A concrete casting pipe branching device according to claim 1 provided at a branch portion, and control means for controlling a concrete delivery direction switching operation of each of the branching devices. A concrete placing device, wherein the delivery direction of the concrete to be delivered is switchably provided at each of pipe branch portions of the delivery pipe and the branch pipe. 3. The concrete casting apparatus according to claim 2, wherein a predetermined amount of the concrete to be fed into the concrete casting pipe is supplied from the branch pipe on the upstream side in the concrete delivery direction to the branch pipe on the downstream side or in the concrete delivery direction. A method for placing concrete, characterized in that concrete is sequentially sent from a downstream branch pipe to an upstream branch pipe, and concrete is stratified in a concrete placing area. 4. The method for placing concrete according to claim 3, wherein the concrete feeding is stopped when the pressure of the concrete to be pressed exceeds a predetermined value.