CN110439189B

CN110439189B - Sleeve grouting method for assembled building shear wall

Info

Publication number: CN110439189B
Application number: CN201910789218.2A
Authority: CN
Inventors: 方毅; 张金国; 陈凯骎; 张斌; 孙楚; 罗磊
Original assignee: Zhejiang Hongyan Testing Technology Co ltd
Current assignee: Zhejiang Hongyan Testing Technology Co ltd
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2021-05-04
Anticipated expiration: 2039-08-26
Also published as: CN110439189A

Abstract

The invention discloses a method for grouting a sleeve of an assembled building shear wall, which relates to the field of building construction and comprises the following steps: the method comprises the following steps: butting the two shear walls through the dowel bars and the sleeves; step two: aligning a gun head of a grouting machine to a grout inlet of the sleeve; step three: a steel wire extends into the sleeve from a grout outlet above the sleeve; step four: butting the steel wire with an oscillator; step five: grouting the grouting material into the grout inlet, continuing grouting when the grouting material overflows from the grout outlet, and slowly pulling out the steel wire; step six; after the steel wire is completely pulled out, continuing grouting for 1-2 s, and then immediately plugging a grout outlet by using a plug; step seven: after the head of the grouting machine is removed, the grout inlet of the sleeve is plugged by a plug within 1 s. Grout in to the sleeve through the limit, the limit passes through the steel wire to the grout material transmission vibration in the sleeve, makes the air of sneaking into in the grout material just overflow from the grout material easily like this to the density of grout material in the sleeve has been guaranteed.

Description

Sleeve grouting method for assembled building shear wall

Technical Field

The invention relates to the field of building construction, in particular to a method for grouting a sleeve of an assembled building shear wall.

Background

Shear walls are also called wind resistant walls or earthquake resistant walls, structural walls. The wall body mainly bears horizontal load and vertical load { gravity } caused by wind load or earthquake action in the house or the structure. Preventing shear failure of the structure.

It is divided into a plane shear wall and a cylinder shear wall. The plane shear wall is used in reinforced concrete frame structure, plate lifting structure and flat slab system. In order to increase the rigidity, strength and collapse resistance of the structure, the reinforced concrete shear wall can be cast in situ or prefabricated in some parts. The cast-in-place shear wall, the peripheral beams and the columns are simultaneously poured, and the integrity is good. The cylinder shear wall is used in high-rise buildings, high-rise structures and suspension structures and is formed by enclosing of partition walls of elevator rooms, staircases, equipment and auxiliary rooms, and the cylinder wall is a cast-in-place reinforced concrete wall body which has higher rigidity and strength and can bear larger horizontal load than a plane shear wall.

The wall can be divided into a bearing wall and a shear wall according to the stress characteristics, wherein the bearing wall mainly bears vertical load, such as a masonry wall; the latter is mainly to bear horizontal loads. In earthquake-proof shelters, horizontal loads are primarily generated by horizontal seismic action, and shear walls are sometimes referred to as earthquake-proof walls.

The shear wall can be divided into a steel plate shear wall, a reinforced concrete shear wall and a reinforced block shear wall according to structural materials. Among them, the reinforced concrete shear wall is most commonly used.

The construction method of the reinforced concrete shear wall in the prior art is generally carried out in a prefabricated assembly mode. For the assembled shear wall, the dowel bars are arranged at the top of the wall, the sleeve is arranged at the bottom of the wall, and the opening of the sleeve faces downwards. After the sleeve is in butt joint with the dowel, grouting can be performed into the sleeve, and the grouting method comprises the following steps: and grouting by using a grouting machine from a grouting pipe at the lower part of the side surface of the sleeve, and stopping grouting immediately after the grout flows out from a grout outlet pipe at the upper part and the grout is fully injected. Therefore, the construction efficiency can be greatly improved, and the mechanical strength of the shear wall can be improved.

In the prior art, the only reference for whether the sleeve is fully filled is whether the slurry overflows from the slurry outlet hole on the upper side, the sleeve is in an invisible state in the grouting process, the slurry overflow from the slurry outlet hole does not actually represent that the sleeve is fully filled, the grouting is invisible, and the quality inspection difficulty and the like exist in the later construction stage.

For example, the grouting process is likely to be filled with air, the air cannot be discharged in a short time, and the grout overflowing of the grout outlet hole can be seen, so that the sleeve is always under the unsaturated condition after grouting is finished, the connection quality is seriously affected, and hidden dangers are brought to the structural safety. Therefore, improvements are needed.

Disclosure of Invention

The invention aims to provide a sleeve grouting method for an assembled building shear wall, which effectively reduces the possibility that air is mixed into grouting material and ensures the connection strength between shear walls.

The above object of the present invention is achieved by the following technical solutions: a grouting method for a sleeve of an assembled building shear wall mainly comprises the following steps:

the method comprises the following steps: butting two adjacent shear walls up and down through the dowel bars and the sleeves;

step two: aligning a gun head of a grouting machine to a grout inlet below the sleeve;

step three: a steel wire extends into the lower part of the interior of the sleeve from a grout outlet above the sleeve;

step four: butting the part of the steel wire positioned in the sleeve with an oscillator so that the oscillator can transmit vibration to the steel wire;

step five: the grouting machine pours grouting material into the grout inlet, when the grouting material overflows from the grout outlet of the sleeve, the grouting machine continues grouting, and at the moment, the steel wire is slowly pulled out from the sleeve;

step six; after the steel wire is completely pulled out, continuing grouting for 1-2 s, and then immediately plugging a grout outlet by using a plug;

step seven: after the head of the grouting machine is removed, the grout inlet of the sleeve is plugged by a plug within 1 s.

Grout in to the sleeve through the limit, the limit passes through the steel wire to the grout material transmission vibration in the sleeve, makes the air of sneaking into in the grout material just overflow from the grout material easily like this to the density of grout material in the sleeve has been guaranteed. Furthermore, the connection strength between the shear walls is ensured after grouting.

Preferably, in the fifth step, the grouting rate of the grouter is kept at a constant speed in the grouting process, and the speed is controlled to be 20dm³/min。

Through slow mode at the uniform velocity with grouting material pouring sleeve in, can reduce grouting material's turbulence degree like this to the probability that air sneaked into has also been reduced.

Preferably, the grouting material used in the fifth step is concrete with slump of 166-177 mm and expansion of 462-471 mm.

After the grout entered into the sleeve, this grout had good mobility, and the closely knit function of oneself can be realized to the utensil to the grout can self fill the space of self, and extrude the air, thereby has just also guaranteed the compactness of self, thereby has just also guaranteed the joint strength of two shear force walls.

Preferably, the concrete comprises, by mass, 67-89 parts of cement, 3-5 parts of diatomite, 98-120 parts of machine-made sand, 81-103 parts of broken stone, 34-38 parts of mineral powder, 40-46 parts of crab shell powder, 4-8 parts of a water reducing agent, 2-6 parts of a leveling agent, 3-7 parts of a retarder, 3-7 parts of iodide salt, 12-18 parts of oleamide, 9-13 parts of polyacrylate emulsion, 15-19 parts of carboxylic styrene-butadiene latex and 75-95 parts of water.

By adding the leveling agent and the retarder into the concrete, the concrete can keep good flowing property in the grouting process, so that the concrete can have a good self-sealing effect.

Preferably, the water reducing agent is sulfonated melamine formaldehyde resin and sodium dodecyl benzene sulfonate, and the mass ratio of the sulfonated melamine formaldehyde resin to the sodium dodecyl benzene sulfonate is 3: 1.

By adopting the technical scheme, firstly, the sulfonated melamine formaldehyde resin and the sodium dodecyl benzene sulfonate are compounded, so that the water reducing effect of the concrete can be effectively improved. Secondly, oleamide not only helps to improve the flow properties of the concrete, but also helps to reduce the probability of corrosion of the steel bars.

In addition, when the insects destroy concrete, the oleamide and the sodium dodecyl benzene sulfonate are inhaled by the insects together, the oleamide destroys the chitins of the insects, and the sodium dodecyl benzene sulfonate forms a water film in the respiratory tract of the insects, so that the insects are suffocated.

Preferably, the crab shell powder is prepared by grinding crab shells treated by a mixed enzyme solution of papain, alkaline protease and trypsin, and the granularity of the crab shell powder is less than 10 um.

By adopting the technical scheme, the chitin appears in the crab shell powder treated by the enzyme solution, so that the crab shell powder has stronger viscosity, the integral adhesion degree of concrete raw materials can be improved, and meanwhile, the chitin is a good bacteriostatic agent, and can reduce the propagation of fungi on the surface of concrete after the concrete is cured, so that the service life of the concrete can be effectively prolonged.

Preferably, the leveling agent is a mixture of ethylene bis fatty acid amide and acrylic ester, and the mass ratio of the ethylene bis fatty acid amide to the acrylic ester is 1: 1.

By adopting the technical scheme, the ethylene bis-fatty acid amide is selected as one of the leveling agents, and can be combined with the polar groups on the surface part of the inorganic material to form a polar group structure similar to an anchoring node, so that the bonding state between the inorganic materials is improved, and the mechanical strength of the cured concrete is enhanced.

Preferably, the retarder is a mixture of sodium acetate and cyclodextrin, and the mass ratio of the sodium acetate to the cyclodextrin is 1: 1.5.

By adopting the technical scheme, Ca exists in the cement²⁺、Mg²⁺The ions and thus the hydration ability of the ions is small, and the water films formed on the surfaces of the particles are thin and have a large attraction force with each other, so that the force required by the cement during molding is also large. And Na in sodium acetate⁺Can exchange Ca in concrete²⁺、Mg²⁺Ion, which is reacted with Ca²⁺、Mg²⁺The ions are just opposite, and the influence on the plasticity of the cement is small, so that the curing rate of the concrete in the grouting process is reduced, and the self-compacting effect is improved.

In addition, the retarding effect can be further improved by compounding sodium acetate and cyclodextrin.

Preferably, the iodide salt is lithium iodide.

By adopting the technical scheme, the iodized salt has stronger thermal stability, and the thermal stability of the organic auxiliary agent can be effectively improved. Particularly, lithium ions of the lithium iodide can also have a matching effect with carbonyl in the water reducing agent and the lubricant, a network-like structure is generated, and the movement of a molecular chain of the organic auxiliary agent and corresponding free radicals is blocked, so that the molecular chain of the organic auxiliary agent needs to overcome a larger energy barrier than a completely free molecular chain when being heated and decomposed, and thus, the thermal decomposition temperature is higher, and the structural strength of the concrete is further improved.

Preferably, the grain size of the machine-made sand is less than 1 mm.

Through adopting above-mentioned technical scheme, make mechanism sand fill the gap of grout material like this easily to can further extrude the air of sneaking into in the concrete effectively, guarantee the density of grout material.

In conclusion, the beneficial technical effects of the invention are as follows:

1. by means of vibrating and grouting at the same time, air in the grouting material is easily discharged, and the self-compacting effect of the grouting material is guaranteed;

2. selecting concrete with slump of 166-177 mm and expansion of 462-471 mm, wherein the concrete can effectively realize self-compaction effect, so that air in the grouting material is easily reduced;

3. the crab shell powder treated by the mixed enzyme liquid is added into concrete, so that the antibacterial property of the grouting material can be effectively improved, and the probability that the grouting material is corroded by microorganisms after being hardened is reduced.

Drawings

Fig. 1 is a schematic view of a process for sleeve grouting of an assembly type building shear wall.

Detailed Description

Example 1:

preparing grouting material:

weighing 67Kg of cement, 3Kg of diatomite, 98Kg of machine-made sand, 81Kg of crushed stone, 34Kg of mineral powder, 40Kg of crab shell powder, 4Kg of water reducing agent, 2Kg of flatting agent, 3Kg of retarder, 3Kg of iodide salt, 12Kg of oleamide, 9Kg of polyacrylate emulsion, 15Kg of carboxylic styrene-butadiene latex and 75Kg of water, and putting into a stirrer in sequence to be uniformly stirred to obtain the finished concrete.

Wherein the water reducing agent is sulfonated melamine formaldehyde resin and sodium dodecyl benzene sulfonate, and the mass ratio of the sulfonated melamine formaldehyde resin to the sodium dodecyl benzene sulfonate is 3: 1. The leveling agent is a mixture of ethylene bis fatty acid amide and acrylic ester, and the mass ratio of the ethylene bis fatty acid amide to the acrylic ester is 1: 1. The retarder is a mixture of sodium acetate and cyclodextrin, and the mass ratio of the sodium acetate to the cyclodextrin is 1: 1.5. The iodide salt is lithium iodide. The grain size of the machine-made sand is less than 1 mm.

In addition, preparation of crab shell powder: firstly, preparing 50ml of sodium sulfite buffer solution with the pH value of 8.0, using 1ml of triton as a surfactant, and using 5g of combined enzyme of alkaline protease, papain and trypsin in a mass ratio of 1: 1 as a catalyst; mixing sodium sulfite buffer solution, triton and combined enzyme to obtain enzyme solution; soaking crab shells in enzyme solution, and hydrolyzing for 2 hours under the conditions that the temperature of a constant temperature shaking table is controlled at 50 ℃ and the rotating speed is 300 r/min; thereafter, the crab shells are ground to crab shell flour having an average particle size of less than 10 μm.

Example 2:

preparing grouting material:

weighing 73Kg of cement, 4Kg of diatomite, 109Kg of machine-made sand, 92Kg of crushed stone, 36Kg of mineral powder, 43Kg of crab shell powder, 6Kg of water reducing agent, 4Kg of flatting agent, 5Kg of retarder, 5Kg of iodide salt, 15Kg of oleamide, 11Kg of polyacrylate emulsion, 17Kg of carboxylic styrene-butadiene latex and 85Kg of water, and putting the materials into a stirrer in sequence to be uniformly stirred to obtain the finished concrete.

Example 3:

preparing grouting material:

weighing 89Kg of cement, 5Kg of diatomite, 120Kg of machine-made sand, 103Kg of crushed stone, 38Kg of mineral powder, 46Kg of crab shell powder, 8Kg of water reducing agent, 6Kg of flatting agent, 7Kg of retarder, 7Kg of iodide salt, 18Kg of oleamide, 13Kg of polyacrylate emulsion, 19Kg of carboxylic styrene-butadiene latex and 95Kg of water, and sequentially putting into a stirrer to be uniformly stirred to obtain the finished concrete.

Example 4:

preparing grouting material:

weighing 67Kg of cement, 4Kg of diatomite, 120Kg of machine-made sand, 92Kg of crushed stone, 34Kg of mineral powder, 40Kg of crab shell powder, 8Kg of water reducing agent, 4Kg of flatting agent, 5Kg of retarder, 7Kg of iodide salt, 18Kg of oleamide, 9Kg of polyacrylate emulsion, 17Kg of carboxylic styrene-butadiene latex and 85Kg of water, and putting into a stirrer in sequence to be uniformly stirred to obtain the finished concrete.

In addition, preparation of crab shell powder: firstly, 50ml of sodium sulfite buffer solution with the pH value of 8.0 is prepared, 1ml of triton is used as a surfactant, and the mass ratio of the triton to the triton is 1: 1, 5g of combined enzyme of alkaline protease, papain and trypsin; mixing sodium sulfite buffer solution, triton and combined enzyme to obtain enzyme solution; soaking crab shells in enzyme solution, and hydrolyzing for 2 hours under the conditions that the temperature of a constant temperature shaking table is controlled at 50 ℃ and the rotating speed is 300 r/min; thereafter, the crab shells are ground to crab shell flour having an average particle size of less than 10 μm.

Example 5:

preparing grouting material:

weighing 89Kg of cement, 3Kg of diatomite, 120Kg of machine-made sand, 81Kg of crushed stone, 36Kg of mineral powder, 43Kg of crab shell powder, 6Kg of water reducing agent, 4Kg of flatting agent, 7Kg of retarder, 5Kg of iodide salt, 12Kg of oleamide, 11Kg of polyacrylate emulsion, 19Kg of carboxylic styrene-butadiene latex and 95Kg of water, and sequentially putting into a stirrer to be uniformly stirred to obtain the finished concrete.

Wherein the water reducing agent is sulfonated melamine formaldehyde resin and sodium dodecyl benzene sulfonate, and the mass ratio of the sulfonated melamine formaldehyde resin to the sodium dodecyl benzene sulfonate is 3: 1. The leveling agent is a mixture of ethylene bis fatty acid amide and acrylic ester, and the mass ratio of the ethylene bis fatty acid amide to the acrylic ester is 1: 1. The retarder is a mixture of sodium acetate and cyclodextrin, and the mass ratio of the sodium acetate to the cyclodextrin is 1: 1.5. The iodide salt is lithium iodide. The grain size of the machine-made sand is less than 11 mm.

Testing the concrete according to a slump flow test method and a V-shaped funnel test method; in addition, the antibacterial property of the concrete is tested, the main method is that the concrete is made into a concrete block of 30cm by 30cm, then 10 drops of cell nutrient solution are dripped into the concrete block, the concrete block is placed in a normal temperature environment for 7 days, and the development number of bacterial colonies is observed; further, 50 termites were placed together with 30cm by 30cm concrete blocks, and the number of surviving termites was observed after 24 hours; in addition, the concrete block after being hardened for 28 days is placed in an environment at 100 ℃ for 7 days, and is taken out to observe whether cracks appear; and finally, applying pressure to the hardened concrete by using a press machine, and testing the compressive strength of the concrete. And the above tests were taken into account to obtain the data in tables 1 and 2 below:

table 1 shows the working properties of the concrete

Table 2 shows the results of the tests for the compressive strength of concrete

Mechanical properties	Example one	Example two	EXAMPLE III	Example four	EXAMPLE five
						7d compressive Strength (MPa)	53.6	54.3	56.8	54.7	54.6
28d compressive Strength (MPa)	63.5	64.8	67.9	64.9	64.3

Meanwhile, the present application also designs comparative examples 1 to 5 as follows:

comparative examples 1,

The formulation of the grouting material differs from that of example 2 only in that no ethylenebisfatty acid amide is added to the leveling agent and no crab shell powder is added to the concrete.

Comparative examples 2,

The formulation of the grouting material differs from that of example 2 only in that no acrylate is added to the leveling agent and the crab shell powder added to the concrete is not treated with the mixed enzyme solution.

Comparative examples 3,

The formulation of the grout differed from example 4 only in that no sodium acetate was added to the retarder and no oleamide was added to the concrete.

Comparative examples 4,

The formulation of the grouting material differs from that of example 4 only in that cyclodextrin is not added to the retarder and sodium dodecylbenzenesulfonate is not added to the water reducing agent.

Comparative examples 5,

The formulation of the grout differed from example 5 only in that no iodide salt was added.

The grouting materials prepared in comparative examples 1 to 4 were tested as in examples 1 to 5, and the test results as in the following table 3 were obtained:

table 3 side test results for comparative examples 1 to 5

From the test results of examples 1 to 5, it can be seen that the concrete of the present application has good fluidity, which ensures that the concrete can ensure good self-sealing property in the sleeve. Secondly, as can be seen from the comparison between example 2 and comparative examples 1 and 2, and between example 4 and comparative examples 3 and 4, good fluidity of concrete can be ensured only when both the retarder and the leveling agent are compounded. Secondly, we can also see that the insecticidal performance can be effectively exerted when the oleamide and the sodium dodecyl benzene sulfonate coexist. And only after the crab shell powder is treated by the enzyme liquid can the concrete have good antibacterial performance.

The following describes embodiments 6 to 10 in further detail with reference to fig. 1.

Example 6:

a grouting method for a sleeve of a fabricated building shear wall comprises the following steps:

step five: grouting machine is to entering thick liquid mouth 20dm³Filling the grouting material of the embodiment 1 at a constant speed/min, and when the grouting material overflows from a grout outlet of the sleeve, continuing grouting by using a grouting machine, and at the moment, slowly pulling the steel wire out of the sleeve;

Example 7:

step five: grouting machine is to entering thick liquid mouth 20dm³Filling the grouting material of the embodiment 2 at a constant speed/min, and when the grouting material overflows from a grout outlet of the sleeve, continuing grouting by the grouting machine, and at the moment, slowly pulling the steel wire out of the sleeve;

Example 8:

step five: grouting machine is to entering thick liquid mouth 20dm³Filling the grouting material of the embodiment 3 at a constant speed/min, and when the grouting material overflows from the grout outlet of the sleeve, continuing grouting by the grouting machine, and at the moment, slowly pulling the steel wire out of the sleeve;

Example 9:

Example 10:

After the grouting materials of examples 6 to 10 are hardened, the sleeve is broken, and then whether the concrete in the sleeve is empty or not is observed, and the results are shown in table three:

appearance of concrete of Table III, examples 6 to 10

Appearance test	Example 6	Example 7	Example 8	Example 9	Example 10
						Whether hollowing out or not	Is free of	Is free of	Is free of	Is free of	Is free of

The results in the third table show that the problem that the concrete is mixed with air to influence the structural strength of the shear wall can be effectively solved.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. A method for grouting a sleeve of a shear wall of an assembly type building is characterized by comprising the following steps: the method comprises the following steps:

step five: the grouting machine pours grouting material into the grout inlet, when the grouting material overflows from the grout outlet of the sleeve, the grouting machine continues grouting, and at the moment, the steel wire is slowly pulled out from the sleeve; the used grouting material is concrete with slump of 166-177 mm and expansion of 462-471 mm;

the concrete comprises the following components in parts by weight,

67-89 parts of cement

3-5 parts of diatomite

98-120 parts of machine-made sand

81-103 parts of crushed stone

34-38 parts of mineral powder

40-46 parts of crab shell powder

4-8 parts of water reducing agent

2-6 parts of flatting agent

3-7 parts of retarder

Iodide salt 3-7 parts

12-18 parts of oleamide

9-13 parts of polyacrylate emulsion

15-19 parts of carboxylic styrene-butadiene latex

75-95 parts of water;

the crab shell powder is formed by grinding crab shells treated by mixed enzyme liquid of papain, alkaline protease and trypsin, and the granularity of the crab shell powder is less than 10 um;

2. The method for grouting the sleeve of the assembled shear wall of the building as claimed in claim 1Characterized in that: in the fifth step, the grouting speed of the grouting machine is kept at a constant speed in the grouting process, and the speed is controlled to be 20dm³/min。

3. The method for grouting the sleeve of the fabricated building shear wall according to claim 1, wherein: the water reducing agent is sulfonated melamine formaldehyde resin and sodium dodecyl benzene sulfonate, and the mass ratio of the sulfonated melamine formaldehyde resin to the sodium dodecyl benzene sulfonate is 3: 1.

4. the method for grouting the sleeve of the fabricated building shear wall according to claim 1, wherein: the leveling agent is a mixture of ethylene bis fatty acid amide and acrylic ester, and the mass ratio of the ethylene bis fatty acid amide to the acrylic ester is 1: 1.

5. the method for grouting the sleeve of the fabricated building shear wall according to claim 1, wherein: the retarder is a mixture of sodium acetate and cyclodextrin, and the mass ratio of the sodium acetate to the cyclodextrin is 1: 1.5.

6. the method for grouting the sleeve of the fabricated building shear wall according to claim 1, wherein: the iodide salt is lithium iodide.

7. The method for grouting the sleeve of the fabricated building shear wall according to claim 1, wherein: the grain size of the machine-made sand is less than 1 mm.