JPH0467909A - Molding method for concrete pipe fitted with step metal jig - Google Patents

Abstract

PURPOSE:To accurately fix a step metal jig to a concrete pipe by a method wherein a segment is fitted in the recessed pat of a core mold and, thereafter, the charging of a stiff-consistency concrete material and the compaction due to vibration are applied to the mold and the segment is detached from the core mold simultaneously with the demolding of the concrete pipe compacted in a state possible in demolding and subsequently detached from the concrete pipe. CONSTITUTION:A stiff-consistency concrete material is charged in a molding cavity and vibrated by a vibrator to be compacted and the upper surface of the concrete material is subjected to compression molding by a press plate 25 to stop vibration. The concrete pipe thus molded within a vertical hole in a state possible in demolding is demolded from a core mold 1 along with an outer mold 11, a pallet 9 and a segment 13 by a lift apparatus B to be transferred to an ageing place and, thereafter, the outer mold 11 is detached and the lock due to movable plate is released immediately or after concrete is stabilized to a certain degree to detach the segment 13.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming a concrete pipe with step fittings, which simultaneously forms the concrete pipe and accurately fixes the step fittings to the concrete pipe. ] A segment is provided in a hollow medium mold so that it can move forward and backward, and the outer surface of the segment coincides with the outer surface of the medium mold during molding,
The segment is constructed so that it retreats into the middle mold during demolding, and the stem/tube fittings are inserted into the insertion holes drilled at intervals in the vertical direction of the segment, and after locking, the middle mold and the outer mold are separated. After putting the hardened concrete material between them and compacting it by giving it vibration, the step fittings are unlocked, the segments are retreated into the medium size to expose the step fittings, and then the concrete pipe is A method of forming a concrete pipe with a step fitting for demolding is known.

[Problem to be solved by the invention]

When using this conventional molding method, work efficiency is poor because step fittings must be attached to the segments installed inside the medium mold, and this installation is difficult when the work is carried out in a narrow molding room formed underground. It was summer.

Moreover, when using the above molding method, when demolding, the segments must first be retreated into the middle mold and separated from the step fittings. In some cases, the step metal fittings released from the segments sag due to their own weight, become loose when attached, or fall off.

[Means to solve the problem]

In order to solve the above problems, the method for forming a concrete pipe with step fittings according to the present invention uses a medium mold, a ring-shaped pallet fitted on the outside of the medium mold, and an outer mold whose lower end is connected to the pallet to form a molding space. In a method for forming a concrete pipe, the concrete pipe is formed, a hardened concrete material is put into the forming space, the concrete is compacted by applying vibrations, and then the concrete pipe is immediately demolded.
A step fitting is attached to the segment that is removably fitted into the recess formed on the outer surface of the medium size, and its both ends are made to protrude outside of the segment. After fitting this segment into the recess of the medium size, the hardened concrete material is The method is characterized in that the segment is removed from the medium size at the same time as the concrete pipe that has been compacted by injection and vibration is removed from the mold, and then the segment is removed from the concrete pipe. .

The above concrete material is compacted by vibration in a vertical hole formed underground, and step fittings are attached to the segments, segments and outer molds are attached to pallets, and outer molds and segments are removed from the formed concrete pipe. Preferably, the breakaway takes place on the ground.

In addition, the step fittings are locked into the segments and molded,
After demolding, it is preferable to release the lock and remove the segment from the concrete pipe.

Furthermore, it is effective to fit the segment into the recess of the medium mold, tighten the segment into the medium mold, mold it, and release the tightening to remove the mold.

[For production]

In the molding method of the present invention, in order to separate the segments from the middle mold and attach the step fittings at the appropriate locations,
Its installation becomes easier. In addition, the segment separates from the middle mold at the same time as the formed concrete pipe, moves to a curing area, and then separates from the concrete pipe. During this time, the step fittings are held in this segment, and the step fittings may sag, become loose, or fall off. is prevented.

[Example 1] Based on Figs. 1 to 4, a molding machine used in an embodiment of the present invention will be explained. 1 is a medium-sized molding machine, and a support provided at the bottom of a vertical hole 2 formed underground. It stands on a table 3 via a vibration isolating material 4 in a detachable manner. A vibrator 5 is provided inside the medium 1, and the lower end of its rotating shaft 6 is linked to a motor 7 installed in the vertical hole 2. Further, a recess 8 is formed in one side of the middle mold 1 from the upper end to the lower end into which a segment described later is fitted.

Reference numeral 9 denotes a ring-shaped pallet inserted outside the medium mold 1, and is supported on a conventionally well-known support portion 10 provided on the lower outer surface of the medium mold 1. Reference numeral 11 denotes an outer mold, the lower end of which is supported by the pallet 9, and the upper end supported by the upper part of the vertical hole 2 via the vibration isolating material 3. The lower end of the outer mold 11 and the pallet 9, and the pallet 9 and the support portion 10 are connected in a hermetically sealed manner by conventionally known means so that the concrete material does not flow out of the mold. 12 is a molding space formed by the middle mold 1, the outer mold 11, and the pallet/soto 9.

13 is a segment that stands up on the pallet 9 in a detachable manner. This segment 13 has a box shape with an open rear end, and is formed so that it fits into the recess 8 of the medium mold 1 in a removable manner, and its outer surface constitutes a part of the outer surface of the medium mold 1. Further, as shown in FIGS. 3 and 4, the lower end of this segment 13 has left and right supports projecting inwardly from the inner edge of the pallet 9, and are supported on a plate 14. A connecting plate 17 is provided vertically from the lower end of the segment 13 to a pin 16 that projects inwardly through a protruding piece 15.
The left and right through holes 18 are removably fitted into each other. Note that it is preferable to provide a backing around the upper end and outer end of the segment 13 to prevent concrete material from entering the middle mold 1.

Reference numeral 19 denotes a step fitting having a U-shaped planar shape, and is composed of a step portion 19a and both left and right end portions 19b, and is further covered with a plastic layer leaving both ends of a metal core material. Reference numeral 20 denotes a horizontally elongated plastic cap fixed to both left and right ends 19b of the step metal fitting 19 in an erected state, and the cap 20 is formed integrally with the plastic layer.

Reference numeral 21 denotes upper and lower insertion ports opened on the outer surface of the segment 13. The insertion opening 21 is formed into a cylindrical shape with a wide outer opening end and a narrow inner opening end so that the step fitting 19 can be easily inserted.

Further, the outer opening of the insertion port 21 is sealed by the plastic cap 20.

Reference numeral 22 designates a movable plate for locking the step fitting 19 formed at the rear part of the segment 13, whose center is pivoted to a vertical plate 23 connecting the ends of both the upper and lower insertion openings 21, and which is connected to the inner end of the insertion opening 21. Both ends are fitted between the step portion 19a and the back surface of the step portion 19a protruding from the step portion 19a. Further, a knob 24 is provided at the center of the movable plate 22.

Reference numeral 25 denotes a pressure plate placed oppositely on the formwork, and is formed to be movable up and down and retractable in the horizontal direction. Also 26
is a reinforcing bar.

Incidentally, the segments 13 are attached to the pallet 9 by horizontally removable connecting means, but the segments 13 and the pallet 9 are detachably connected using magnetic force, and both can be attached to the medium-sized 1 separately. In some cases, it can be inserted. Further, the step fitting 19 is configured to be held in the insertion port 21 by the movable plate 22 which is a locking device, but it is possible to hold both ends 19b of the step fitting 19 between the inner end of the insertion port 21 and the cap 20. You can also do this.

An embodiment of the present invention using the above-mentioned molding machine is shown in FIGS.
The explanation will be based on (8).

When the step fittings 19 are inserted from the step portion 19 & side into each cylindrical insertion opening 21 of the segment 13 which is stood up on the floor or laid down horizontally so that the outer surface faces upward, the left and right ends of the step fittings 19 are inserted. The cap 20 fixed to the portion 19b in an erected state overlaps the outer open end of the insertion port 21, so that the step portion 19a protrudes inside the segment and the ends 19b on both sides protrude outward.

When the movable plate 22 is rotated by grasping the knob 24 protruding from the center thereof, and the both ends of the movable plate 22 are fitted between the rear end of the insertion opening 21 and the step portion 19a, the step fitting 19 is inserted into the segment 13. Further, the cap 20 is tightly fitted to the open end of the insertion port 21.

As shown in FIGS. 3 and 4, the lower end of the segment 13 with the step metal fittings 19 fixed thereon is attached to the pallet 9 as shown in FIGS.
The receiver protruding from the inside of the plate is supported on the portion 14, and the through hole 18 of the connecting plate 17 is vertically provided on the lower surface of the segment 13. By fitting together, the segments 13 are attached to the pallet 9.

Incidentally, as shown in FIG. 5(1), the segments 13 may be set on the pallet 9 in advance, and the step fittings 19 may be attached thereto.

Next, as shown in FIG. 5 (2), the reinforcing bars 26 and the outer mold 11 are mounted on the pallet 9 on which the segments 13 are attached, and then the reinforcing bars 26 and the outer mold 11 are attached as shown in FIG. 1 and FIG. 5 (3). , is inserted outside the medium mold 1 installed in the underground vertical hole 2, and the lower end of the pallet 9 is supported on the support part 10 provided on the medium mold 1, so that the end 19b of the step fitting 19 protrudes. A space 12 is formed.

Hardened concrete material is put into this forming space 12,
After the concrete is compacted by applying vibrations by the vibrator 5, the upper surface of the concrete material is compression-molded by the pressure platen 25, and the vibrations are stopped, as shown in FIG. 5(4).

In this way, the concrete pipe A, which has been formed into a demoldable state in the vertical hole 2, is moved to a medium-sized shape by the lifting device B together with the outer mold 11, pallet 9, and segments 13, as shown in FIG. After demolding from 1, demolding from medium mold 1,
After moving this to a curing place, remove the outer mold 11 as shown in Fig. 5 (7), and release the lock by the movable plate 22 immediately or when the concrete is stable enough to form the segment. 13 is removed, the figure 5 (8
), it is supported by a pallet 9, and both ends 1
9b is buried and a step metal fitting material concrete pipe A is obtained in which the step portion 19& is protruded into the pipe. This is cured for a predetermined period of time to produce a product.

(Example 2) Next, another example will be described based on FIGS. 6 and 7.

The molding machine of this embodiment differs from the molding machine of the previous embodiment in that the structure of the segment 13, the locking device of the step fitting 19, and the support mechanism of the segment 13 to the pallet 9 are improved, and the molding machine of the previous embodiment is improved. Tightening is an additional device. Therefore, in this embodiment, these parts will be mainly explained, and the explanation of the above embodiment and the drawings will be used for other mechanisms.

FIG. 6 is a perspective view of the segment 13 seen from the inside;
When fitted into the recess 8 of the medium size 1, an upper plate 13b that matches the upper surface of the recess 8 is provided horizontally on the upper end of the outer wall plate 13a, which has an arc-shaped cross section and matches the outer surface of the medium size 1, and the left and right lower ends of the outer wall plate 13a are fitted. The receivers of the pallet 9 are formed with fitting grooves 28 on both sides of the plate 27, into which they can be inserted and removed. Also, the outer wall board 13
A pair of upper and lower insertion openings 20 are formed in a.

As shown in FIG. 7, the locking member 29 of the step fitting 19 provided inside the outer wall plate 13a
A locking portion 29 provided at the upper end of the locking body 29 is formed so as to engage with the back surface of the step portion 19a by its own weight.

Further, a horizontal plate 30 is provided inside the outer wall plate 13a, and a notch 31 and a pair of left and right through holes 32 are formed in this.

The notch 31 fits into a guide plate 33 that projects from the recess 8 over its entire length in the vertical direction, and the through hole 32 has a tightening arm 3 that passes through the recess 8 and moves forward and backward by a cylinder 34.
The protrusion 36 of No. 5 is fitted.

Next, examples using this molding machine are shown in Fig. 5 (1) to (8).
This will be explained with reference to.

In FIG. 6, after rotating the locking body 29 in the direction of the arrow to position the locking portion 29λ below the insertion opening 21 and inserting the step fitting 19 into the insertion opening 21, the locking body 29 is rotated in the direction of the arrow. 29 is rotated in the opposite direction, the locking part 291 engages with the back surface of the step part 19a, and the step fitting 19 is temporarily fixed. The locking body 29 is operated manually, but may also be operated mechanically.

The segment 13 with the step metal fittings 19 temporarily fixed in this way is supported by the pallet 9 as shown in FIG. 5(1). In this case, the receivers protruding horizontally from the inner surface of the pallet 9 fit into the fitting grooves 28 formed at both the left and right lower ends of the segments 13 on both sides of the plate 27.
3 until the lower end of pallet 9 collides with the inner surface of pallet 9.

Next, as in the case of FIG. 5 (2), the reinforcing bars 26 and the outer mold 11 are installed on the pallet 9, and these are
As shown in FIG. 3, the pallet 9 is supported on the support part 10 by being inserted outside the medium mold 1 installed in the vertical hole 2, and the segment 3 is fitted into the recess 8 of the medium mold 1. At this time, the notch groove 31 of the horizontal plate 30 provided inside the segment 13 fits into the guide plate 33 that projects vertically from the recess 8, and as shown in FIG. is pressed against the guide plate 33, the step portion 19a is further pulled inward by the locking portion 29&, and the cap 20 is pressed against the outer peripheral surface of the insertion port 21.

Therefore, in the pair of left and right through holes 33 bored in the horizontal plate 30,
As shown in FIG. 7, the projections 36 of the left and right tightening arms 35
are inserted respectively, and the tightening arm 3 is tightened by the cylinder 34.
5 toward the middle mold 1 side, the upper plate 13 of the segment 13
b and the outer wall plate 13& are in close contact with the recess 8, the watertightness of the joint surface between the recess 8 and the segment 13 is maintained, and the vibration of the medium 1 is reliably propagated to the segment 13.

In this way, when the compacted concrete material is poured into the molding space 12 formed by tightening the segments 13 in the recess 8 in the same manner as in the past, and is compacted to a state where it can be demolded by applying vibrations. As shown in FIG. 5(4), after the upper end is compression-molded by the pressure plate 25, the arm 35 is loosened by the cylinder 34, and the tightening of the segment 13 in the recess 8 is released.

Next, the concrete pipe is molded into a removable state.
After removing the middle mold 1 along with the outer mold 11, pallet 9, and segments 13 using the lifting device B as shown in FIG. 5 (5), the outer mold 11 is removed from the concrete pipe A as shown in FIG. 5 (7). break away.

Immediately after the outer mold 11 is removed, or when the concrete is stable enough to form, the lower end of the locking body 29 is pulled inward, the locking part 29a is released from the step part 19a, and the segment 13 is moved inward. Segment 13 when pulled horizontally
The pallet 9 supports are separated from the plate 27 and from the inner wall surface of the concrete pipe, and are formed into a concrete pipe to which the step fittings 19 are attached, as shown in FIG. 5(8).

In both of the above embodiments, the hardened concrete material is put into the forming space 12, and while it is being formed, the step fittings 19 are attached to the separately prepared segments 13, and the state shown in FIG. 5 (2) is established. By setting this to the middle mold 1 and immediately inserting it into the demolded middle mold 1, the molding is continuously repeated.

Furthermore, in both of the above embodiments, the outer mold 11 was inserted into the middle mold 1 together with the pallet 9, and was removed from the middle mold 1 together with the pallet 9 after molding. Sometimes I do.

(Effects) As described above, the method for forming a concrete pipe with a step fitting according to the present invention has the following advantages: (1) Since the step fitting can be attached by separating the segment from the middle mold, the workability is good; This effect is extremely significant, especially when molding work is carried out in a basement.

Further, by preparing a plurality of segments and setting step fittings therein in advance, the molding operation can be performed continuously, and the molding cycle time can be significantly shortened.

(2) Since the concrete pipe is demolded while holding the step fittings in the segments, there is no chance of the step fittings sagging due to their own weight, or the step fittings will become loose or fall off, ensuring safety as the step fittings are securely attached. It is possible to construct a high manhole.

(3) When forming segments by tightening them into medium-sized recesses, the vibrations from the vibrator are transmitted uniformly to the entire concrete material, making it possible to obtain a concrete pipe with a homogeneous surface and a clean surface.

(4) When the medium-sized recess for accommodating the segment is made into a sealed structure, it is possible to completely block the intrusion of sewage, etc. into the medium-sized mold, and prevent failure of the vibrator, etc. inside the medium-sized mold. There is an effect that it can be done.

[Brief explanation of the drawing]

Figures 1 to 4 show a molding machine used in an embodiment of the present invention. Figure 1 is a plan view thereof, Figure 2 is a sectional view taken along line X-X in Figure 1, and Figure 3 is a vertical side view showing the main parts of the same molding machine, Figure 4 is a rear view of the main parts of the same, and Figure 5 is a rear view of the main parts of the same molding machine.
Figures (1) to (8) are explanatory diagrams showing the molding order of the same embodiment. 6 and 7 show a molding machine used in another embodiment of the present invention, FIG. 6 is a perspective view of a segment in the same molding machine, and FIG. 7 shows the main parts of the same molding machine. FIG. l; Medium size 5: Vibrator 9; Pallet 12; Molding space 19 Step metal fittings 21; Insertion port 2; Vertical hole 8: Recess 11: Outer mold 13: Segment 20; Cap application agent Hisada Matsumoto 3b

Claims (1)

[Claims] 1. A molding space is formed by a medium mold, a ring-shaped pallet fitted on the outside thereof, and an outer mold whose lower end is connected to the pallet, and hardened concrete material is poured into the molding space. death,
In a concrete pipe forming method in which the concrete pipe is compacted by vibration and then immediately demolded, a step fitting is attached to a segment that removably fits into a recess formed on the outer surface of the medium size, and both ends of the step fitting are attached to the segment. After protruding outward and fitting this segment into a medium-sized recess, hardened concrete is introduced and compacted by vibration, and the segment is removed from the mold at the same time as the concrete pipe that has been compacted to a state where it can be removed. A method for forming a concrete pipe with a step fitting, characterized by separating from the medium size and then separating the segments from the concrete pipe. 2. Compact the concrete material by vibration in a vertical hole formed underground, attach the step fittings to the segments, attach the segments and outer molds to the pallet, and remove the outer molds and segments from the formed concrete pipe. 2. The method for forming a concrete pipe with step fittings according to claim 1, wherein the separating step is performed on the ground. 3. The method of forming a concrete pipe with a step fitting according to claim 1, wherein the step fitting is locked to the segment during molding, and after demolding, the lock is released and the segment is separated. 4. The method for forming a concrete pipe with a step fitting according to claim 1, characterized in that after the segment is fitted into the medium-sized recess, the segment is tightened to a medium-sized shape and molded, and this tightening is released and the mold is removed. .