JP2007182757A - Mortar or concrete spraying method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mortar or concrete spraying method for economically and efficiently spraying mortar or concrete of high strength by suppressing the occurrence of rebound and eliminating clogging of a hose. <P>SOLUTION: In the mortar or concrete spraying method, aggregate 8 supplied from an aggregate force-feeder 9, and cement milk 13 supplied from a cement milk supply means 14, are mixed to obtain a mortar material 1 or concrete material, and the mortar material 1 or concrete material is sprayed. In this case, a part 12a of water 12a, 12b forming the mortar material 1 or concrete material is added to the aggregate 8 supplied from the aggregate force-feeder 9. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mortar or concrete spraying method and apparatus.

When the applicant forms a grid-like frame by spraying mortar material or concrete material on a mold pre-formed on a high slope, the conventional water, cement, and fine aggregate are used. Compared with mortar or concrete spraying method, in which gravel or crushed stone as coarse aggregate is mixed in advance, mortar material or concrete material is used in order to efficiently perform spraying at high places. A separate pumping method for spraying the constituent cement milk and aggregate separately is under development (Patent Document 1 below).

Then, for example, sand as fine aggregate is moved in a connecting hose having a length of about 400 m by compressed air and mixed with cement milk at a position of about 10 m before the spray nozzle to obtain a mortar material. An operator supported by a lifeline sprays mortar material against the mold while holding the spray nozzle, thereby forming a grid-like frame.
JP 2001-248164 A

However, there are the following problems.
(1) Cement milk and sand are not completely mixed, resulting in problems of reduced strength of mortar and rebound. That is, cement milk and sand do not mix evenly,
When mortar material is sprayed, sand that is not covered with cement milk rebounds on the slope (rebound), and the rebounded sand accumulates on the slope, so the spraying operation is temporarily suspended and air is blown from the spray nozzle. It is necessary to remove the accumulated sand from the slope.
In addition, it is necessary to prepare a large amount of sand in advance in consideration of the loss of sand due to rebound, leading to an increase in cost.

(2) The sand is often of good quality in recent years and often contains silt.
Since the sand itself contains a small amount of moisture, if the sand contains silt in addition to coarse sand and fine sand, the silt is stuck in the connected hose that pumps the sand. The connecting hose is likely to be clogged.

(3) The connecting hose is an existing hose used for normal mortar or concrete spraying completed by kneading all materials in advance, and is formed by connecting a number of short hoses of about 20 m. This does not occur with normal finished mortar or concrete, but when only sand is transported, air easily leaks from the gaps in the seams of the short hose. This makes it impossible to form a mortar of a predetermined composition, or the quality of the mortar is lowered, and there is a possibility that a high strength mortar having a high compressive strength cannot be constructed.

The present invention has been made in consideration of such circumstances, suppresses the occurrence of rebound, eliminates clogging of the hose, and economically and efficiently applies high strength mortar or concrete spraying. An object is to provide a mortar or concrete spraying method and apparatus that can be used.

That is, according to the mortar or concrete spraying method of the present invention, the mortar material or the concrete material is obtained by mixing the aggregate supplied from the aggregate pump and the cement milk supplied from the cement milk supply means. In a mortar or concrete spraying method for spraying a material or concrete material, a part of water constituting the mortar material or concrete material is added to the aggregate supplied from the aggregate pump Yes.

Further, according to another aspect of the present invention, an aggregate pump for supplying aggregate and water, a cement milk supply means for supplying cement milk, and a mixing means for mixing the aggregate, water and the cement milk. And a mortar or concrete spraying device comprising a spray nozzle for spraying a mortar material or a concrete material obtained by mixing.

As described above in detail, in the present invention, the mortar material or concrete material is obtained by mixing the aggregate and added water supplied from the aggregate pump and the cement milk supplied from the cement milk supply means, As the mortar or concrete material is sprayed, the occurrence of rebound is suppressed, clogging of the hose is eliminated, and the high strength mortar or concrete spray in which the aggregate and cement milk are uniformly mixed is economically applied. And, there is an effect that it is possible to provide a mortar or concrete spraying method and apparatus that can be efficiently performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a mortar material obtained by mixing sand and water as aggregates supplied from an aggregate feeder and cement milk supplied from cement milk supply means (usually the weight ratio is cement 1). : Sand 4: Water 0.5
It is. ) The state of forming the frame 2 by spraying 1 and the state of greening protection of the slope N by spraying the vegetation base 3 are shown.

Specifically, a net 4 such as a wire mesh is stretched on the slope N, and a reinforcing bar 5 is placed on the net 4.
Are arranged in a lattice shape to form a method frame spraying portion, and the curing sheet 6 is disposed in the space portion of the method frame spraying portion, while the mortar material 1 is sprayed so as to cover the lattice-shaped reinforcing bars 5 to form a lattice shape. After that, the curing sheet 6 is peeled off, and the vegetation base 3 containing plant seeds and fertilizer is sprayed into the legal frame 2 to protect the greening of the slope N. .

In this embodiment, mortar material in which cement, sand as fine aggregate, and water are mixed as spray material will be described, but the present invention is cement, sand as fine aggregate, Needless to say, the present invention can also be applied to concrete materials in which gravel, gravel, crushed stone, and the like as coarse aggregate and water are mixed.

The mortar material 1 spraying device (hereinafter referred to as mortar spraying device) includes an aggregate pump 9 for supplying sand 8 and water 12a as fine aggregates, and an air compressor 10 connected to the aggregate pump 9. And a pump for pressure feeding (for example, a piston type pump and a squeeze type pump) 14 as a cement milk supply means for supplying cement milk 13 obtained by mixing cement 11 and water 12b, and the pressure pumped through the hose 15. Sand 8 and water 12a, hose 1
In order to spray the mortar material 1 obtained by mixing the portable milking device 17 as a mixing means that mixes the cement milk 13 (11, 12b) fed by pressure 6 and discharges it as the mortar material 1. The mortar material spray nozzle 20 is mainly used.

Furthermore, the mortar spraying device has a hose 19 for feeding mortar material connected to a mortar discharge port (see FIG. 2) 18 of the portable mixing device 17, and the mortar material spraying is applied to the tip of the hose 19. A nozzle 20 is provided. The hose 15 for pumping the sand 8 and the water 12a is a connecting hose having a length of about 400 m at the maximum, and the connecting hose 15 is connected to a number of short hoses of about 20 m. Further, the sand 8 and the water 12a are discharged at a predetermined discharge amount from the discharge port 9a of the aggregate pump 9 by the compressed air supplied from the air compressor 10.

In the present invention, a part 12a of water 12a, 12b constituting the mortar material 1 is transferred to an aggregate pump 9
It is comprised so that it may add to the sand 8 as a fine aggregate supplied from.

The supply amount of the cement milk 13 (11, 12b) pumped by the pump 14 is set and changed by a discharge amount gauge provided in the pump 14, and is pumped through the hose 15 measured in advance or in real time. By adjusting the discharge amount of the cement milk 13 (11, 12b) by the pump 14 according to the pumping amount of the sand 8 and water 12a, the sand 8
The mixing ratio of water 12a and cement milk 13 (11, 12b) can be arbitrarily controlled.

As the mortar material 1 obtained in the present invention,
Cement 11: Sand 8: Water 12a, 12b = 1: 4: The thing with the compounding ratio of 0.45-0.6 is preferable.
The specific blending amount of the mortar material 1 is, for example, cement 11 (A) 50 per batch.
(C) 22.5-30 liters of the total amount of water 12a, 12b is added to Kg, sand 8 (B) 200 kg.

In the present invention, of the water 12a and 12b constituting the mortar material 1, the water 12a from the aggregate pumping machine 9 side has a water content of 5 to 10%, preferably 7 to 9% with respect to the weight of the aggregate 8.
Then, the remaining water 12b is supplied as cement milk 13.
The lower limit of the water 12a supplied from the aggregate pumping machine 9 side is 5%. If it is less than 5%, the sand 8 and the water 12a are stuck in the hose 15 for pumping the sand 8 and the water 12a. This is because the hose 15 may be blocked. The upper limit of water 12a is 10
% Is too heavy when it exceeds 10%, and the required amount of sand 8 required for spraying
In addition, it is difficult to pump the water 12a from the aggregate pump 9 to the mixing device 17 at a high place through the long hose 15, and the pumping amount may vary, and the cement milk 13 (1
1, 12b) Cement milk 13 (11, 1 while ensuring fluidity even when a water reducing agent (a drug that can ensure fluidity even if the amount of water such as mortar is reduced) is reduced.
This is because inconvenience may occur when the hose 16 is pumped in step 2b).
In short, in this invention, the amount of water 12a added to the sand 8 is preferably as small as possible so that the sand 8 does not adhere to the hose 15.

For example, when considering the specific blending amount of the mortar material 1 described above, for example, the water cement ratio is 6
Assuming 0%, the total amount of water required for cement 11 [said (A) 50 kg] is 30 liters. When the moisture content with respect to the weight of the aggregate 8 on the aggregate side is set to 7%, the sand 8 [((
B) 200 kg of water 12a is contained in (D) 14 liters. (The amount of water to be added to the sand 8 is obtained by measuring the surface water amount of the sand 8 in advance and adding water in a shortage of the set amount of water.) Therefore, the cement milk 13 is composed of the cement 11 [(A) 50 kg). (E) 1 of water 12b
Prepare by mixing 6 liters.
When the moisture on the aggregate side is increased, the amount of water on the cement milk side is relatively reduced, and the fluidity of the cement milk 13 is lowered. In this case, when an appropriate amount of water reducing agent is added to the cement milk 13, the fluidity is improved.

In this case, the discharge amount of sand 8 and water 12a discharged from the discharge port 9a of the aggregate pump 9 (K
g / min) is about (F) 107 kg / min, and the cement milk 13 (11, 12b) of 33 kg / min is discharged from the pump 14 for pumping with respect to the discharge amount.

The hose 19 for feeding the mortar material has a length including the mortar material spray nozzle 20 of 3 so that the spray range of the mortar material 1 is set to a spray radius of about 3 to 20 m around the portable mixing device 17. The portable mixing device 17 installed in the vicinity of the nozzle 20 has a sand 8 and water 12a and cement milk 13 (11, 11).
12b) is mainly composed of a mixing cylinder 21 for mixing.

As shown in FIGS. 2 and 3, the mixing cylinder 21 has an inner diameter D of sand 8 and water 12.
The diameter a is slightly larger than the inner diameter d of the hose 15 for pumping a (for example, the same diameter may be 3 to 3 times), and one end side (the mortar material discharge port 18 side) is sequentially squeezed to make the discharge On the outer peripheral surface portion of the outlet 18, a male screw portion 22 for concentrically connecting the mortar material feeding hose 19 is formed, and on the other end side, a male screw portion for connecting the hose 15 concentrically. 23, and a female thread portion 25 for connecting a cement milk pouring cock 24 is formed on the cylindrical wall 21a of the cylindrical body 21 in the vicinity of the connecting portion of the hose 15, and the cement milk is formed in the cock 24. The hose 16 for pumping 13 (11, 12b) is connected.
In addition, mixing efficiency improves more when the injection port of cement milk is two or more places.

Then, an extension axis P of the female screw portion 25 toward the inside of the cylinder is inclined by, for example, an angle θ of 40 degrees with respect to the cylinder axis Q while passing through the cylinder axis Q, and is pumped into the cylinder 21. The cement milk 13 (11, 12b) is supplied to the sand 8 and the water 12a obliquely from the rear, while the cement milk 13 (11, 12b) is introduced into the cylinder 21 by the female screw portion 25.
) Is squeezed in the axial direction of the cylinder 21, and the cement milk 13 is squeezed by this squeeze port.
The diffusion means 26 for diffusing (11, 12b) into a film is configured. The inner diameter d ′ of the hose 19 is substantially equal to the inner diameter d of the hose 15.

According to the mortar spraying device having the above configuration, the water 1 is provided around the sand 8 in the hose 15.
Since 2a exists, the inside of the hose 15 is in a hydrophilic state. Therefore, the mixing cylinder 2
1, the familiarity with the cement milk 13 (11, 12b) is improved, and the sand 8 is uniformly mixed with the cement milk 13 (11, 12b). Therefore, the mortar strength is improved, and rebound of the sand 8 can be avoided when the mortar material is sprayed. Furthermore, even when silt is contained in addition to coarse sand and fine sand, the moisture content with respect to the weight of the sand 8 is set to 5 to 10%, so that the moisture content exceeds the moisture content at which the silt is compacted by the wall surface of the hose 15. Therefore, it is possible to avoid a situation where the hose 15 is stuck in the hose 15 in a state where the silt is hardened and the hose 15 is blocked.

Moreover, since loss of the sand 8 due to rebound is avoided, it is not necessary to prepare a large amount of sand 8 to be used as in the prior art, and it is economical because it is unnecessary to remove accumulated sand from the slope. . Moreover, the mortar material can be efficiently sprayed.

Further, the gap between the joints of the hose 15 is covered with the sand 8 containing the water 12a being pumped through the hose 15, so that air leakage can be reduced. Therefore, the pumping amount of the sand 8 is not lowered, and a high strength mortar having a large compressive strength can be constructed. In addition, the high intensity | strength mortar whose compressive strength of the mortar material 1 is 24-36N (Newton) / mm <2> can be constructed. Construction of such a high-strength mortar makes it possible to reduce the cross section of the method frame and improve economic efficiency.
In addition, although the legal frame was taken up as embodiment of the mortar or concrete spraying method of this invention, it is applicable also to the slope protection construction method by mortar or concrete spraying other than a legal frame. In addition to the slope protection method, any method that sprays mortar or concrete is widely applicable.

BRIEF DESCRIPTION OF THE DRAWINGS It is whole structure explanatory drawing which shows one Embodiment of this invention. It is a principal part longitudinal cross-sectional view in the said embodiment. It is principal part structure explanatory drawing in the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mortar material 8 Aggregate 9 Aggregate pump 12a, 12b Water which comprises mortar material 12a Part of water 13 Cement milk 14 Cement milk supply means

Claims (3)

A mortar or concrete spray is obtained by mixing the aggregate supplied from the aggregate pump and the cement milk supplied from the cement milk supply means to obtain a mortar material or concrete material and spraying the mortar material or concrete material. In the attaching method, a part of water constituting the mortar material or concrete material is added to the aggregate supplied from the aggregate pumping machine. The mortar or concrete spraying method according to claim 1, wherein water is added to the aggregate so that a moisture content with respect to the weight of the aggregate is 5 to 10%. Aggregate pressure feeder for supplying aggregate and water, cement milk supply means for supplying cement milk, mixing means for mixing the aggregate, water and cement milk, and mortar material or concrete obtained by mixing A mortar or concrete spraying device comprising a spray nozzle for spraying material.

Images