阅读说明：本技术 基于海砂海水trc预制外壳的约束混凝土柱及制备方法 (Confined concrete column based on sea sand seawater TRC prefabricated shell and preparation method ) 是由 张勤 陈明慧 陈欧军 杨翘楚 于 2020-05-26 设计创作，主要内容包括：本发明公开了一种基于海砂海水TRC预制外壳的约束混凝土柱及制备方法,包括TRC预制外壳和浇筑在TRC预制外壳内的核心混凝土柱；TRC预制外壳包括耐腐蚀内衬和粘接在耐腐蚀内衬外周的TRC复合材料；TRC复合材料包括细骨料混凝土和预埋在细骨料混凝土中的至少一层纤维编织网；细骨料混凝土采用海砂、海水和水泥等制成；耐腐蚀内衬的表面均开设有若干个镂空灌浆孔,每个镂空灌浆孔内均充填有细骨料混凝土；核心混凝土柱采用海边碎石、海砂、海水和水泥制成。本发明中所有组成材料均耐海洋腐蚀环境,主要原料可以就地取材,且施工便利、绿色环保。TRC预制外壳既能充当核心混凝土柱的浇筑模板,又对其产生约束作用,从而提高总轴压承载力。(The invention discloses a confined concrete column based on a sea sand seawater TRC prefabricated shell and a preparation method thereof, wherein the column comprises a TRC prefabricated shell and a core concrete column poured in the TRC prefabricated shell; the TRC prefabricated shell comprises a corrosion-resistant lining and a TRC composite material adhered to the periphery of the corrosion-resistant lining; the TRC composite material comprises fine aggregate concrete and at least one layer of fiber woven mesh pre-embedded in the fine aggregate concrete; the fine aggregate concrete is prepared from sea sand, seawater, cement and the like; the surface of the corrosion-resistant lining is provided with a plurality of hollow grouting holes, and fine aggregate concrete is filled in each hollow grouting hole; the core concrete column is made of seaside broken stone, sea sand, seawater and cement. All the components in the invention are resistant to marine corrosion environment, the main raw materials can be obtained from local materials, and the construction is convenient and environment-friendly. The TRC prefabricated shell can be used as a pouring template of the core concrete column and can also have a restraint effect on the core concrete column, so that the total axial pressure bearing capacity is improved.)

1. The utility model provides a confined concrete post based on prefabricated shell of sea sand sea water TRC which characterized in that: the TRC prefabricated shell comprises a TRC prefabricated shell and a core concrete column poured in the TRC prefabricated shell;

the TRC prefabricated shell comprises a corrosion-resistant lining and a TRC composite material adhered to the periphery of the corrosion-resistant lining;

the TRC composite material comprises fine aggregate concrete and at least one layer of fiber woven mesh pre-embedded in the fine aggregate concrete; aggregate in the fine aggregate concrete is sea sand, and a water body mixed with the fine aggregate concrete is seawater;

The surface of the corrosion-resistant lining is provided with a plurality of hollow grouting holes, and fine aggregate concrete is filled in each hollow grouting hole;

aggregate in the core concrete column is seaside broken stone and sea sand, and the water body mixed with the core concrete column is seawater.

2. The sea sand seawater TRC precast shell based confined concrete column of claim 1, characterized in that: the core concrete column is pre-embedded with corrosion-resistant reinforcing ribs.

3. The sea sand seawater TRC precast shell based confined concrete column of claim 2, characterized in that: the corrosion-resistant reinforcing rib is a stainless steel bar or an FRP rib.

4. The sea sand seawater TRC precast shell based confined concrete column of claim 1, characterized in that: the fiber woven mesh is a carbon fiber woven mesh or a basalt fiber woven mesh.

5. The column of confined concrete based on sea sand seawater TRC precast shell according to claim 1 or 4, characterized in that: the surface of the fiber woven net is provided with a gum dipping layer or a reinforcing steel wire net lining.

6. The sea sand seawater TRC precast shell based confined concrete column of claim 1, characterized in that: in the TRC prefabricated shell, the binding power T is formed between the corrosion-resistant lining and the fine aggregate concrete, and the calculation formula is as follows:

T＝T₁+T₂

T₂＝f_tA′

In the above formula, T₁The cementing strength between the contact surfaces of the corrosion-resistant lining and the fine aggregate concrete is shown; t is₂The bolt force of fine aggregate concrete in the hollow grouting holes in the corrosion-resistant lining is obtained;is the average bonding stress between the corrosion-resistant lining and the fine aggregate concrete(ii) a S is the perimeter of the cross section of the contact surface of the corrosion-resistant lining and the fine aggregate concrete; l is the axial length of the contact surface of the corrosion-resistant lining and the fine aggregate concrete; f. of_tThe split tensile strength of the medium mortar; a' is the filling cross-sectional area of the fine aggregate concrete in all the hollowed-out grouting holes.

7. The sea sand seawater TRC precast shell based confined concrete column of claim 2, characterized in that: the corrosion-resistant reinforcing rib is a reinforcement cage and comprises a stirrup and a longitudinal rib; the total axial pressure that the confined concrete column can bear is F_TThen F is_TThe calculation formula of (a) is as follows:

F_T＝F_c+F_e

F_c＝f_cA_c+f_yA_s

F_e＝σ_rA_cor

in the above formula, F_cProviding axial load bearing capacity for the core concrete column; f_eAdditional axial pressure bearing capacity is provided for the TRC prefabricated shell to restrain the core concrete column; f. of_cThe axial compressive strength of the core concrete; a. the_cIs the effective cross-sectional area of the core concrete column; f. of_yThe yield strength of the corrosion-resistant reinforcing bar is enhanced; a. the_sThe total cross-sectional area of the corrosion-resistant reinforcing rib; sigma _rRestraining radial compressive stress on the core concrete column for the TRC prefabricated shell; a. the_corIs the cross-sectional area of the core concrete column; d_corThe diameter or side length of the corrosion-resistant lining; s is the distance between stirrups in the corrosion-resistant reinforcing bar; f. of_yvThe yield strength of the stirrup in the reinforcement is enhanced for corrosion resistance; a. the_svThe cross-sectional area of a single stirrup in the corrosion-resistant reinforcing rib; l_sThe length of the mesh side of the fiber woven mesh is; n is the number of layers of fiber woven meshes in the TRC prefabricated shell; a. the_fThe cross-sectional area of a single fiber in the fiber woven mesh; f. of_fFor fibres in woven websUltimate tensile strength of the dimension.

8. The preparation method of the confined concrete column based on the sea sand seawater TRC prefabricated shell is characterized by comprising the following steps of: the method comprises the following steps:

step 1, preparing a corrosion-resistant lining: manufacturing a corrosion-resistant lining with a set size specification by adopting PVC (polyvinyl chloride) or stainless steel pipes, and performing hollow-out treatment on the surface of the corrosion-resistant lining to form a plurality of hollow-out grouting holes;

step 2, fixing the corrosion-resistant lining: a layer of corrosion-resistant plastic inner membrane plate is arranged on the inner side surface of the corrosion-resistant lining, and the inner cavity of the corrosion-resistant plastic inner membrane plate is fixed by adopting a cross support;

step 3, preparing the TRC composite material, comprising the following steps:

Step 31, preparing fine aggregate concrete: mixing cement, sea sand, seawater and a water reducing agent according to a set proportion to form sand slurry-like fine aggregate concrete;

step 32, coating the first inner layer fine aggregate concrete: after the step 2 is finished, coating a layer of mortar-like fine aggregate concrete prepared in the step 31 on the outer side surface of the corrosion-resistant lining to form a first inner layer of fine aggregate concrete, and filling each hollowed-out grouting hole of the corrosion-resistant lining with the mortar-like fine aggregate concrete;

step 33, laying a first layer of fiber woven mesh: laying a layer of fiber woven mesh on the outer side surface of the first inner layer fine aggregate concrete to form a first layer of fiber woven mesh, and smearing a layer of mortar-like fine aggregate concrete on the outer side of the first layer of fiber woven mesh to form first outer layer fine aggregate concrete; when the fiber woven mesh in the TRC composite material is a single layer, directly skipping to step 35; when the fiber woven mesh in the TRC composite material is more than two layers, skipping to step 34;

step 34, repeating the step 33, laying the fiber woven net from the second layer to the last layer until the set thickness requirement is met;

step 35, maintaining;

Step 4, forming a TRC prefabricated shell: after the maintenance is finished in the step 35, removing the corrosion-resistant plastic inner membrane plate and the cross support to form a prefabricated TRC shell;

step 5, pouring the core concrete column, which comprises the following steps:

step 51, preparing core concrete: mixing cement, seawater, sea sand and seaside crushed stone according to a set proportion to form core concrete;

step 52, mounting the prefabricated TRC shell: installing and fixing the TRC prefabricated shell formed in the step 4 on a construction site of the infrastructure to be reinforced;

step 53, pouring a core concrete column: pouring the core concrete prepared in the step 51 into an inner cavity of the prefabricated TRC shell by taking the prefabricated TRC shell installed in the step 52 as a template, vibrating while pouring, and after pouring is finished, leveling the surface;

and step 54, curing to form a confined concrete column comprising the core concrete column and the TRC prefabricated shell.

9. The method for preparing the column of confined concrete based on the TRC precast shell made from sea sand and seawater as claimed in claim 7, wherein the method comprises the following steps: in step 53, the prefabricated TRC shell installed in step 52 is used as a template, the corrosion-resistant reinforcing ribs are placed in the inner cavity of the prefabricated TRC shell, and then the core concrete prepared in step 51 is poured into the inner cavity of the prefabricated TRC shell.

10. The method for preparing the column of confined concrete based on the TRC precast shell made from sea sand and seawater as claimed in claim 7, wherein the method comprises the following steps: in step 31, when preparing the fine aggregate concrete, the set ratio of cement, sea sand, seawater and water reducing agent is 1: 1.36: 0.34: 0.016; in step 51, when preparing the core concrete, the set ratio of cement, seawater, sea sand and seaside crushed stone is 1: 0.5: 1.5: 3.0.

Technical Field

The invention relates to the technical field of concrete, in particular to a confined concrete column based on a TRC prefabricated shell and a preparation method thereof.

Background

Island reefs, sea defense, ports, docks and traffic infrastructures in China are being constructed in a large scale. In the construction of these civil engineering, a large amount of stones, sand and water are necessary to form the basic raw materials of the concrete material, but the stones, sand and water adopted in the common concrete are mainly materials under the fresh water environment, so as to prevent the steel bars in the common concrete structure from being corroded by corrosive media under the marine environment, rusting and being damaged. If a common concrete structure is adopted in the island construction, a large amount of stones, river sand, fresh water and the like need to be transported from inland, so that the transportation cost is extremely high; in addition, the general reinforced concrete structure has poor durability in the marine corrosive environment, and thus it is urgently needed to develop a concrete structure or member adapted to the marine corrosive environment to complete the corresponding infrastructure construction. Meanwhile, a large amount of resources such as sea stones, sea sand, sea water and the like exist in the marine environment, if the marine sand and sea water concrete can be prepared from local materials for construction, the problem of shortage of fresh water and light sand resources can be relieved, the manufacturing cost of a concrete structure can be greatly reduced, and the method has remarkable significance for marine economic development and sea island national defense construction.

In summary, there is a need to develop a novel fiber composite-concrete composite column member which is suitable for marine corrosive environment, has good stress performance, is convenient to construct, and has obvious economic benefits, so as to provide support for the construction of infrastructures such as island, sea defense and port wharf.

Disclosure of Invention

The invention aims to solve the technical problems of the prior art and provides a confined concrete column based on a TRC prefabricated shell and a preparation method thereof.

In order to solve the technical problems, the invention adopts the technical scheme that:

a confined concrete column based on a sea sand seawater TRC prefabricated shell comprises the TRC prefabricated shell and a core concrete column poured in the TRC prefabricated shell.

The TRC prefabricated shell comprises a corrosion-resistant lining and a TRC composite material bonded to the periphery of the corrosion-resistant lining.

The TRC composite material comprises fine aggregate concrete and at least one layer of fiber woven mesh pre-buried in the fine aggregate concrete. The aggregate in the fine aggregate concrete is sea sand, and the water body mixed with the fine aggregate concrete is seawater.

A plurality of hollow grouting holes are formed in the surface of the corrosion-resistant lining, and fine aggregate concrete is filled in each hollow grouting hole.

Aggregate in the core concrete column is seaside broken stone and sea sand, and the water body mixed with the core concrete column is seawater.

The core concrete column is pre-embedded with corrosion-resistant reinforcing ribs.

The corrosion-resistant reinforcing rib is a stainless steel bar or an FRP rib.

The fiber woven mesh is a carbon fiber woven mesh or a basalt fiber woven mesh.

The surface of the fiber woven net is provided with a gum dipping layer or a reinforcing steel wire net lining.

In the TRC prefabricated shell, the binding power T is formed between the corrosion-resistant lining and the fine aggregate concrete, and the calculation formula is as follows:

T＝T₁+T₂

T₂＝f_tA′

in the above formula, T₁Is the cementing force between the contact surfaces of the corrosion-resistant lining and the fine aggregate concrete. T is₂The bolt force of the fine aggregate concrete in the hollow grouting hole in the corrosion-resistant lining is obtained.

Is the average bonding stress between the corrosion-resistant lining and the fine aggregate concrete. And S is the perimeter of the cross section of the contact surface of the corrosion-resistant lining and the fine aggregate concrete. l is the axial length of the contact surface of the corrosion-resistant lining and the fine aggregate concrete. f. of_tThe split tensile strength of the medium mortar. A' is the filling cross-sectional area of the fine aggregate concrete in all the hollowed-out grouting holes.

The corrosion-resistant reinforcing rib is a reinforcement cage and comprises a stirrup and a longitudinal rib. The total axial pressure that the confined concrete column can bear is F_TThen F is_TThe calculation formula of (a) is as follows:

F_T＝F_c+F_e

F_c＝f_cA_c+f_yA_s

F_e＝σ_rA_cor

in the above formula, F_cProviding axial load bearing capacity for the core concrete column; f_eAdditional axial pressure bearing capacity is provided for the TRC prefabricated shell to restrain the core concrete column; f. of_cThe axial compressive strength of the core concrete; a. the_cIs the effective cross-sectional area of the core concrete column; f. of_yThe yield strength of the corrosion-resistant reinforcing bar is enhanced; a. the_sThe total cross-sectional area of the corrosion-resistant reinforcing rib; sigma_rRestraining radial compressive stress on the core concrete column for the TRC prefabricated shell; a. the_corIs the cross-sectional area of the core concrete column; d_corThe diameter or side length of the corrosion-resistant lining; s is the distance between stirrups in the corrosion-resistant reinforcing bar; f. of_yvThe yield strength of the stirrup in the reinforcement is enhanced for corrosion resistance; a. the_svSection of single stirrup in reinforcement bar for corrosion resistanceArea of the face; l_sThe length of the mesh side of the fiber woven mesh is; n is the number of layers of fiber woven meshes in the TRC prefabricated shell; a. the_fThe cross-sectional area of a single fiber in the fiber woven mesh; f. of_fIs the ultimate tensile strength of the fibers in the woven web of fibers.

The preparation method of the confined concrete column based on the sea sand seawater TRC prefabricated shell comprises the following steps.

Step 1, preparing a corrosion-resistant lining: the method is characterized in that a corrosion-resistant lining with a set size specification is made of PVC or stainless steel pipes, and the surface of the corrosion-resistant lining is hollowed to form a plurality of hollowed grouting holes.

Step 2, fixing the corrosion-resistant lining: the inner side surface of the corrosion-resistant lining is provided with a layer of corrosion-resistant plastic inner membrane plate, and the inner cavity of the corrosion-resistant plastic inner membrane plate is supported by a cross for fixation.

Step 3, preparing the TRC composite material, comprising the following steps:

step 31, preparing fine aggregate concrete: mixing cement, sea sand, seawater and a water reducing agent according to a set proportion to form the sand slurry-like fine aggregate concrete.

Step 32, coating the first inner layer fine aggregate concrete: and (3) after the step 2 is finished, coating a layer of the mortar-like fine aggregate concrete prepared in the step 31 on the outer side surface of the corrosion-resistant lining to form a first inner layer of fine aggregate concrete, and filling each hollowed-out grouting hole of the corrosion-resistant lining with the mortar-like fine aggregate concrete.

Step 33, laying a first layer of fiber woven mesh: and paving a layer of fiber woven mesh on the outer side surface of the first inner layer fine aggregate concrete to form a first layer of fiber woven mesh, and smearing a layer of mortar-like fine aggregate concrete on the outer side of the first layer of fiber woven mesh to form first outer layer fine aggregate concrete. When the woven fiber mesh in the TRC composite is one layer, the process directly proceeds to step 35. When the woven fiber mesh in the TRC composite material has two or more layers, the process goes to step 34.

And 34, repeating the step 33, and laying the fiber woven net from the second layer to the last layer until the set thickness requirement is met.

And step 35, maintaining.

Step 4, forming a TRC prefabricated shell: and (35) after the maintenance is finished, removing the corrosion-resistant plastic inner membrane plate and the cross support to form the prefabricated TRC shell.

Step 5, pouring the core concrete column, which comprises the following steps:

step 51, preparing core concrete: mixing cement, seawater, sea sand and seaside crushed stone according to a set proportion to form the core concrete.

Step 52, mounting the prefabricated TRC shell: and (4) installing and fixing the TRC prefabricated shell formed in the step (4) on the construction site of the infrastructure to be reinforced.

Step 53, pouring a core concrete column: and taking the prefabricated TRC shell installed in the step 52 as a template, pouring the core concrete prepared in the step 51 into an inner cavity of the prefabricated TRC shell, vibrating while pouring, and after pouring is finished, leveling the surface.

And step 54, curing to form a confined concrete column comprising the core concrete column and the TRC prefabricated shell.

In step 53, the prefabricated TRC shell installed in step 52 is used as a template, the corrosion-resistant reinforcing ribs are placed in the inner cavity of the prefabricated TRC shell, and then the core concrete prepared in step 51 is poured into the inner cavity of the prefabricated TRC shell.

In step 31, when preparing the fine aggregate concrete, the set ratio of cement, sea sand, seawater and water reducing agent is 1: 1.36: 0.34: 0.016. in step 51, when preparing the core concrete, the set ratio of cement, seawater, sea sand and seaside crushed stone is 1: 0.5: 1.5: 3.0.

the invention has the following beneficial effects:

(1) the invention can use local materials and fully utilize ocean resources such as sea sand and seawater. For example, in fine aggregate concrete and core concrete, except cement and a water reducing agent, seawater, sea sand and seaside broken stones can be obtained from local resources, so that the transportation cost is greatly reduced. Wherein the sea sand can also be coral sand, and the sea side broken stone can also be coral stone.

(2) Is suitable for the marine salt corrosion environment and has good corrosion resistance. The materials are all corrosion-resistant materials, and seawater, sea sand or seaside broken stones in the fine aggregate concrete and the core concrete are obtained from oceans and are self corrosion-resistant. The corrosion-resistant lining, the fiber woven mesh and the corrosion-resistant reinforcing ribs can resist corrosion and have good durability.

(3) The bearing capacity is strong. The setting of fretwork grout hole in the corrosion-resistant inside lining for tensile strength between corrosion-resistant interior village and the TRC combined material is high, and the mechanicalness is good, and the ductility is good, carries out the hoop restraint to core concrete column, has improved the axle load bearing capacity of core concrete column.

(4) The demoulding is removed, the structural integrity is improved, and the construction speed is accelerated. The corrosion-resistant lining and the TRC composite material with the surface subjected to the notch hollow-out treatment not only serve as a stress constraint component of the core concrete column, but also serve as a template of the core concrete column, so that the demolding procedure is omitted, a large amount of template materials are saved, and the construction speed of a project is accelerated.

(5) The adhesive property is strong. Fretwork has been done on corrosion-resistant inside lining surface, and during the construction, the pulpous fine aggregate concrete of sand among the TRC combined material will link up fretwork grout hole, and when increasing area of contact, the pulpous fine aggregate concrete of sand also provides the certain cotter bolt power of corrosion-resistant inside lining for T ═ T₁+T₂>T₁Thereby the bonding performance is stronger than that of the smooth lining surface, and the bearing capacity of the concrete is improved.

(6) Is economical and practical and saves cost. The sea sand seawater is locally used, so that the transportation expense is saved, and compared with other combined columns, FRP composite materials, corrugated steel pipes and the like are used for restraining, reinforcing and restraining concrete.

Drawings

Fig. 1 is a schematic structural diagram of a column of confined concrete based on a sea sand seawater TRC prefabricated shell in a cylindrical front section.

Fig. 2 is a schematic structural diagram of a square column front section of a confined concrete column based on a sea sand seawater TRC prefabricated shell.

Fig. 3 is a schematic perspective view of a restrained concrete column of a TRC prefabricated shell based on sea sand and seawater in a cylindrical shape.

Fig. 4 is a schematic perspective view of a confined concrete column in the form of a square column based on a sea sand seawater TRC prefabricated shell.

Fig. 5 is a schematic view of the cylindrical corrosion resistant liner of fig. 3.

Fig. 6 is a schematic diagram of the construction of the corrosion resistant liner of fig. 4 in the form of a square cylinder.

Fig. 7 is a schematic illustration of the TRC pre-fabricated enclosure of fig. 3 when pre-fabricated.

Fig. 8 is a schematic view of the TRC prefabricated shell of fig. 4 when prefabricated. .

Fig. 9 is a schematic view of a force analysis of the cylindrical core concrete of fig. 3.

Fig. 10 is a schematic view of force analysis of the square column-shaped core concrete of fig. 4.

Among them are:

10. a TRC composite; 11. fine aggregate concrete; 12. weaving a fiber mesh;

20. a corrosion resistant liner; 21. hollowing out grouting holes;

30. a core concrete column; 31 core concrete; 32. longitudinal ribs; 33. hooping;

41. a corrosion-resistant plastic inner membrane plate; 42. and (4) supporting by using a cross.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.