JP4787119B2 - Concrete placing apparatus and concrete placing method - Google Patents

Description

  The present invention relates to a concrete placing apparatus used for constructing a concrete structure and a concrete placing method using the concrete placing apparatus.

It is common to use a concrete pump as a construction method of a concrete structure (for example, refer patent document 1). When placing concrete using a concrete pump, construction defects such as junkers (cavities) and cavities often occur at the beginning of casting, joints, or places where the reinforcing bars are dense. In order to prevent this, the Japanese Society of Civil Engineers' Standard Specification in 1967 stated that “When concrete is struck, first, mortar with the same composition as mortar in concrete is spread and then concrete is placed on top of it. It is necessary to prevent the concrete surface from being cleaned and the bean plate from being formed (explanation of unreinforced concrete 41). In addition, in the 49th edition, “If the formwork is narrow, the seam is below the formwork, and it is difficult to spread mortar on the old concrete surface, the mortar content is larger than usual and the coarse aggregate maximum dimension is small. It may be said that the first few batches of concrete may be driven (explanation 132).
Japanese Patent Laid-Open No. 11-13972

However, the placement using the above-described concrete pump places the concrete after placing the mortar, and it is necessary to replace the two types of placement, so it takes time and the placement method described above. May cause new construction defects such as cold joints that take a long time to pile up, and a long time before vibration compaction after piling, resulting in poor compaction. It was.
The present invention has been made in view of the above circumstances, and it is possible to easily and economically sort mortar and concrete or two types of concrete, and concrete placement that can construct a concrete structure without construction defects. An object is to provide an apparatus and a concrete placing method.

In order to solve the above problems, the invention of claim 1 is a concrete placement apparatus 100 as shown in FIG.
A first supply pipe 3 that is provided at the upper end of the opening of the mold 1 in which the reinforcing bars 2, 2,.
Sieving the concrete discharged from the first supply pipe into a predetermined coarse aggregate size, and sieving 4 for producing mortar or rich concrete;
A sliding portion 5 that supports the sieve so as to be slidable back and forth, and
The first supply pipe is detachably provided on the sieve.

According to the invention of claim 1, the concrete discharged from the first supply pipe is removed by leaving coarse aggregate larger than the sieve mesh remaining on the sieve mesh as the sieve slides back and forth by the slide portion, Mortar or small coarse aggregate concrete that has passed through the sieve mesh is placed in the mold. Since the first supply pipe is detachably attached to the sieve, after sieving with a sieve and placing mortar or rich blended concrete in the mold, the first supply pipe is removed from the sieve. By placing concrete directly from the first supply pipe into the mold without passing through a sieve, different types of concrete can be placed for those that have been sieved and those that have not been sieved. . By placing different types of concrete in this way, it is possible to achieve the conventionally recommended placement method, and compared to the case of placing two types of blending with a concrete pump as in the past. The construction work can be greatly simplified.
As a result, it is possible to prevent a jumper generated at the lower end portion of a high-height member such as a column or wall, a joint portion, or the lower end portion of a beam having a large amount of reinforcing bars. Furthermore, the cavity which arises in the inside of the lower end part of a high member, a beam, a column, and a wall with many reinforcing bars can be prevented, and it can be set as a concrete structure without a construction defect.
In addition, it is not necessary to use too soft concrete to increase the filling properties of the concrete, so there is no separation of the concrete due to vibration compaction work, and it is possible to prevent the occurrence of water spots and grain on the surface. it can.
Moreover, the aggregate of the mortar or rich concrete can be easily changed to an arbitrary size by changing the size of the sieve mesh.

The invention of claim 2 is a concrete placement apparatus according to claim 1, for example, as shown in FIG.
The lower surface of the slide portion is provided with a second supply pipe 6 for guiding and placing the mortar or rich concrete on the placing surface in the mold.

  According to the invention of claim 2, since the second supply pipe for guiding and placing mortar or rich concrete on the placement surface is provided on the lower surface of the slide portion, the second supply pipe The mortar or rich blended concrete can be reliably cast on the casting surface in the mold, and the mortar or rich blended concrete does not fall freely to the casting surface, so that the occurrence of jumpers can be prevented.

The invention of claim 3 is a concrete placing method for placing concrete using the concrete placing apparatus 100 according to any one of claims 1 or 2, for example, as shown in FIG.
A first placing step of passing concrete through the sieve from the first supply pipe and placing the mortar or rich concrete in the mold;
Removing the first supply pipe from the sieve and placing the concrete directly into the mold, and a second placing step.
The first placing step and the second placing step are alternately and continuously performed.

  According to the invention of claim 3, the first placing step of passing concrete through the sieve from the first supply pipe and placing mortar or rich blended concrete in the mold, and sieving the first supply pipe The second placement process, in which the concrete is placed directly into the formwork after being removed from the mold, is performed alternately and continuously, so that different types of concrete can be easily placed and good at the beginning or at the joint. Can place concrete.

  According to the present invention, different types of concrete can be placed easily and easily, and a concrete structure free from construction defects can be constructed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a usage state of the concrete placing apparatus 100.
As shown in FIG. 1, a large number of reinforcing bars 2, 2,... Are arranged in the mold 1 vertically and horizontally, and the concrete placing device 100 is attached to the upper end of the opening of the mold 1. The concrete placement apparatus 100 screens the first supply pipe 3 for supplying concrete and the concrete discharged from the first supply pipe 3 into a predetermined coarse aggregate size, and then mortar or rich concrete And a slide portion 5 that supports the sieve 4 so as to be slidable back and forth. Moreover, the mortar or rich blended concrete that has passed through the sieve 4 flows into the lower surface of the slide portion 5, and the second supply pipe 6 that guides the mortar or rich blended concrete is connected to the casting surface in the mold 1. Yes.

The first supply pipe 3 is composed of a flexible hose, for example, and is connected to the tip of a concrete pump pressure feed pipe (not shown).
The sieve 4 is formed in a box shape convex downward, and a sieve mesh 4a having a predetermined size is provided at the bottom. Further, the sieve 4 is provided with a jig (fixing part) 41 to which the first supply pipe 3 is detachably fixed. The jig 41 is attached to the upper surface of a box 42 provided on the sieve mesh 4a, and a band or the like in which the first supply pipe 3 can be inserted is exemplified. And when the 1st supply pipe | tube 3 is being fixed to the jig | tool 41, the sieve 4 was slid back and forth on the slide part 5 with the pulsation of the concrete pump, and was supplied to the sieve 4 by this back-and-forth movement. Concrete is sieved.

  The slide portion 5 includes a placement portion 51 on which the sieve 4 is slidably placed back and forth. The placement portion 51 is made of mortar or rich blended concrete manufactured by sieving with the sieve 4. A through hole 52 penetrating vertically is formed so as to be driven into the frame 1. A second supply pipe 6 is connected to the through hole 52, and mortar or rich blended concrete sieved by the sieve 4 is struck into the mold 1 through the through hole 52 and the second supply pipe 6. Established. A rising portion 53 that rises upward is formed on the outer peripheral edge of the upper surface of the placement portion 51, and the rising portion 53 is disposed so as to surround the outer periphery of the sieve 4 placed on the placement portion 51. Therefore, the sieve 4 is prevented from dropping from the placement portion 51. The width and length of the mounting portion 51 are larger than the width and length of the sieve 4, and the width of the upper end of the opening, that is, the mold 1 faces each other so as to be installed at the upper end of the opening of the mold 1. It is formed slightly larger than between the wall portions 1a and 1a.

  The second supply pipe 6 is composed of a flexible hose, for example, and is connected to a lower surface of the slide part 5, that is, a through hole 52 formed in the placement part 51. Thereby, the mortar or the rich blended concrete that has passed through the sieve 4 from the first supply pipe 3 is guided by the second supply pipe 6 and driven into the placing surface in the mold 1. As the placement surface, for example, it is guided to the lower end portion of the concrete structure to be constructed at the start of placing or to the joint portion at the time of joining.

Next, a concrete placement method for placing concrete using the above-described concrete placement apparatus 100 will be described.
First, a large number of reinforcing bars 2, 2,... Are arranged in the mold 1 vertically and horizontally, and the slide part 5 is installed at the upper ends of the opposing walls 1a, 1a of the mold 1. The first supply pipe 3 Pour concrete into sieve 4. As a result, the sieve 4a is sieved to a predetermined size, and coarse aggregate larger than the sieve 4a is left on the sieve 4a to be removed, and the mortar or the rich concrete passing through the sieve 4 is the second supply pipe. 6 and guided by the second supply pipe 6 to the placement surface in the mold 1 to be placed (first placement step). When a predetermined amount of mortar or rich concrete is placed in this way, the first supply pipe 3 fixed to the sieve 4 is removed, and the concrete is not allowed to pass through the sieve 4 from the first supply pipe 3. Directly into the mold 1 (second placing step).
In this way, passing the sieve 4 and placing mortar or rich concrete, and placing the concrete directly into the mold 1 from the first supply pipe 3 without passing the sieve 4 The concrete wall is constructed by continuously and alternately moving the front and rear positions of the mold 1.

As described above, according to the embodiment of the present invention, the concrete discharged from the first supply pipe 3 onto the sieve mesh 4a is sieved by sliding the sieve 4 back and forth on the slide portion 5, In the state of mortar or rich blended concrete, it is placed through the second supply pipe 6 at the lower end in the mold 1 that is the placement surface. And since the 1st supply pipe | tube 3 is provided in the jig | tool 41 of the sieve 4 so that attachment or detachment is possible, after sieving and placing mortar or rich blend concrete in the formwork 1, the 1st supply pipe | tube 3 3 is removed from the sieve 4 and the concrete is placed directly into the mold 1 from the first supply pipe 3 without passing through the sieve 4, so that the sieve is divided into the concrete and the concrete that is not sieved. It is possible to place various types of concrete. By placing two types of concrete in this way, it is possible to achieve the conventionally recommended placement method, and compared to the case of placing two types of concrete with a concrete pump as before. The construction work can be greatly simplified.
As a result, it is possible to prevent junkers that occur at the lower end of high-height members such as columns and walls, joints, and the lower end of beams with a large amount of rebar, and the lower end and rebar of high-height members It is possible to prevent a large amount of cavities generated in the inside of a beam, column, or wall, and to make a concrete structure free from construction defects.
Moreover, the aggregate of the mortar or rich concrete can be easily changed to an arbitrary size by changing the size of the sieve mesh 4a.
Moreover, since the 2nd supply pipe | tube 6 which guides mortar or rich blend concrete is provided in the lower surface of the slide part 5 on the casting surface, mortar or rich blend concrete is made into the formwork 1 with this 2nd feed pipe 6. Since the mortar or the rich blended concrete does not fall freely to the casting surface, the occurrence of jumpers can be prevented.

In addition, this invention is not limited to the said embodiment, In the range which does not deviate from the summary, it can change suitably.
For example, in the above embodiment, the present invention is applied when a concrete wall is constructed. However, the present invention is not limited to this, and the concrete placing apparatus of the present invention is also applied when constructing a concrete beam or a concrete column. 100 and concrete placement methods can be applied.

It is the principal part perspective view which showed the use condition of the concrete placement apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Formwork 2 Reinforcing bar 3 1st supply pipe 4 Sieve 5 Slide part 6 2nd supply pipe 100 Concrete placement apparatus

Claims (3)

A first supply pipe that is provided at the upper end of the opening of the formwork in which reinforcing bars are arranged to supply concrete;
Sieving the concrete discharged from the first supply pipe into a predetermined coarse aggregate size, and producing a mortar or rich concrete,
A sliding portion that supports the sieve so as to be slidable back and forth, and
The concrete placing apparatus, wherein the first supply pipe is detachably provided on the sieve.   The lower surface of the slide part is provided with a second supply pipe for guiding and placing the mortar or rich concrete on the placing surface in the mold. Concrete placement equipment. In a concrete placing method for placing concrete using the concrete placing apparatus according to claim 1 or 2,
A first placing step of passing concrete through the sieve from the first supply pipe and placing the mortar or rich concrete in the mold;
Removing the first supply pipe from the sieve and placing the concrete directly into the mold, and a second placing step.
The concrete placement method, wherein the first placement step and the second placement step are alternately and continuously performed.

Images