CN107806010A - A kind of assembled multiple tube seawater marine sand concrete bridge pier and preparation method - Google Patents

Abstract

The invention discloses an assembled composite pipe seawater sea-sand concrete bridge pier. The structure is composed of a plurality of superimposed composite pipe seawater sea-sand concrete column segments (100), which are connected as a whole through post-tensioning and prestressing. It is characterized in that the composite pipe seawater sea sand concrete pier column segment (100) is composed of composite pipe (1), seawater sea sand concrete (2), corrugated pipe (3), prestressed reinforcement (4), shear reinforcement (7) Composed together, a pair or more than one pair of convex ribs (6) and grooves (5) are arranged between the joints of every two composite pipe seawater sea sand concrete pier column segments (100), and the convex ribs (6) and the groove (5) are bonded by cementing materials, and each composite pipe seawater sea sand concrete pier column segment (100) is provided with a corrugated pipe (3) along the height direction, and one or more prestressed tendons ( 4) Run through the corrugated pipe (3) arranged in each column segment. The invention has the advantages of good durability, high bearing capacity, good corrosion resistance, easy access to materials, and is conducive to sustainable development. At the same time, the structure has the advantages of large-scale prefabrication, transportation, convenient installation, short construction period, low energy consumption, The environmental pollution is small, and it can be applied to the construction of marine engineering structures.

Description

A prefabricated composite pipe seawater sea sand concrete bridge pier and its manufacturing method

technical field

The invention belongs to the technical field of civil engineering structures, and in particular relates to an assembled composite pipe seawater sea sand concrete bridge pier and a manufacturing method thereof.

Background technique

In recent years, with the continuous development of material science and the progress of bridge design technology, the pursuit of short construction period, high efficiency, high quality and low pollution has become a new development trend in bridge construction. In our country, the prefabrication technology of the bridge superstructure is quite mature, but the prefabrication of the substructure is still in the preliminary stage, and the experience in the assembly of bridge piers is insufficient. Compared with the traditional cast-in-place construction method, the prefabricated bridge pier has the advantages of small construction area, less environmental pollution, short construction period and high safety.

With the continuous increase of engineering construction, the trend of seawater and sea sand resources is becoming more and more obvious. However, offshore and marine engineering construction will face harsh natural corrosion environments. Chlorides and sulfates in sea water and sea sand will accelerate the degradation of concrete. The corrosion of steel bars has a negative impact on the durability of concrete, which restricts the application of seawater and sea sand in concrete. If traditional freshwater river sand is used as raw material, its development and transportation costs will greatly restrict the development of marine engineering construction, and the comprehensive benefits will be low.

Traditional CFST has the characteristics of high bearing capacity and good ductility, and is widely used in ordinary environmental structures. However, after replacing ordinary concrete with seawater and sea sand concrete, the steel pipe will inevitably face the problem of corrosion in the environment of high concentration of chloride ions, which is an urgent need to be solved for the application of concrete filled steel pipe in marine engineering. For this reason, from the perspective of material purification and protection, the engineering community has proposed rust prevention measures such as sea sand desalination, adding rust inhibitors, and steel reinforcement protection. However, these methods greatly increase the project cost without changing the structural performance. The corrosion problem cannot be fundamentally avoided and the durability of the structure can be guaranteed.

Fiber reinforced composite (FRP) is composed of fiber material and resin matrix, which has strong corrosion resistance and good designability, and also has the advantages of light weight and high strength. It can be compared with traditional materials (concrete, steel, etc.) , wood, etc.) are jointly stressed through a reasonable combination. The commonly used fiber types are glass fiber, carbon fiber, aramid fiber, basalt fiber, etc.

Contents of the invention

The purpose of the present invention is to provide a prefabricated composite pipe seawater sea sand concrete bridge pier and its manufacturing method. The prefabricated pier structure solves the problems of traditional cast-in-place construction pier with large ground area, long construction period, serious environmental pollution, poor safety and low efficiency. and other defects, the composite seawater sea sand concrete pier structure, using fiber reinforced composite (FRP), fundamentally avoids the corrosion of ordinary steel pipe concrete in humid and high chloride ion concentration environments, and solves the problem of easy buckling of steel pipes and durable structures Poor performance and other technical defects. It makes full use of abundant seawater and sea sand resources, saves costs, and brings huge comprehensive benefits to the construction of marine engineering.

The technical solution of the present invention is: an assembled composite pipe seawater sea sand concrete pier, the structure is composed of a plurality of superimposed composite pipe seawater sea sand concrete column segments, which are connected as a whole through post-tensioning and prestressing, It is characterized in that the composite pipe seawater sea-sand concrete bridge pier column section is composed of composite pipe, seawater sea-sand concrete, corrugated pipe, prestressed tendons, and shear reinforcement, and the composite pipe is composed of an inner fiber layer and an outer fiber layer. It is composed of the inner wall and outer wall of the steel pipe, and the thickness of the composite pipe gradually increases from the top of the pier to the bottom of the pier. A pair or more than one pair of convex ribs and grooves are arranged between the joints of each two composite pipe seawater sea sand concrete pier columns. , the shapes and sizes of the convex ribs and grooves match each other, and play the role of socket connection shear resistance. The convex ribs and grooves are bonded by cementing materials, and the column sections of each composite pipe seawater sea sand concrete pier are arranged along the height direction There are corrugated pipes, and one or more prestressed tendons are arranged around the cross-section and run through the corrugated pipes of each column segment. One end of the prestressed tendons is fixed inside the cap and serves as a positioning piece.

In the structure of the present invention, the connecting parts of the pier column sections of the seawater sea sand concrete of the composite pipes are discontinuous, so when subjected to longitudinal loads, the composite pipes mainly provide hoop restraint for the internal seawater sea sand concrete, and the longitudinal bending resistance is mainly composed of The prestressed tendon bears the composite pipe. The inner fiber layer and the outer fiber layer are respectively bonded to the inner wall and outer wall of the steel pipe. Corrosion protection, the thickness of the composite pipe gradually increases from the top of the pier to the bottom of the pier, which effectively enhances the confinement effect of the concrete in the plastic hinge area at the bottom of the pier. Except for seawater and sea sand concrete, all structural components are made of corrosion-resistant materials, which are suitable for direct application of seawater and seawater. Sand-cast concrete lays the technical foundation. The interfitting between convex ribs and grooves, as well as shear bars and connecting channels, ensures the structural integrity of the whole, especially the shear bearing capacity of the segmental joints.

The cross-sectional shape of the composite pipe seawater sea-sand concrete column segment is chamfered rectangle, circle, ellipse, or dumbbell shape, and the outer surface of each column segment has the same size and is neat and smooth.

The inner fiber layer and the outer fiber layer can be made of glass fiber, carbon fiber, aramid fiber, basalt fiber or a mixture of several of them, and the angle between the fiber direction and the component axis direction is between 0° and 90° In between, the bonding glue is epoxy resin glue, and the bonding and compounding with the inner and outer walls of the steel pipe is realized by hand lay-up lamination process, vacuum assisted forming process or mechanical winding process.

The seawater and sea sand concrete is prepared by using sea water and sea sand as raw materials, adding cement, gravel, water reducer, and expansion agent. The sea water and sea sand can be prefabricated with local materials, which reduces the transportation cost of materials. It significantly saves the construction period, cost and natural resources of marine engineering, greatly reduces the carbon emissions in the process of engineering construction, and is conducive to sustainable development.

The corrugated pipe is made of rubber, plastic or composite material, and its plane position and size on each column segment are the same and correspond to each other.

The shear reinforcement is one or more than one stainless steel reinforcement, stainless steel pipe, composite material reinforcement, composite material pipe, fiber and steel composite reinforcement or fiber and steel composite pipe, anchored between the convex ribs of each column segment Among them, the anchorage length is greater than the height of the convex rib, and the groove corresponding to the column segment is provided with a connecting channel for the shear reinforcement. The size of the connecting channel is greater than or equal to the size of the shear reinforcement. The shear reinforcement and the connecting channel are anchored after passing through the cementing material.

The prestressed tendons are composite material tendons, composite material cables, composite material and steel composite reinforcement, composite material and steel composite cables.

The cementing material is one of resin-based cementing material or cement-based cementing material.

A method for manufacturing an assembled composite pipe seawater sea sand concrete pier is characterized in that it at least includes the following steps:

A. Prefabricated column segment: Prefabricate multiple composite pipe seawater sea sand concrete column segments according to the predetermined cross-sectional shape and size. When prefabricating, first process the steel pipe with the required thickness, and bond the inner fiber layer and the outer layer according to the predetermined angle and number of layers. The fiber layer forms a composite pipe, pouring and curing seawater sea-sand concrete with a predetermined mix ratio to obtain a composite pipe seawater sea-sand concrete column segment, and a pair of joints and More than one pair of convex ribs and grooves, the shape and size of the convex ribs and grooves match each other. During prefabrication, corrugated pipes and shear reinforcements are arranged, and the shear reinforcements are anchored in the convex ribs of each column segment.

B. Arrangement of prestressed tendons: fix one end of the prestressed tendons in advance in the connection plane of the cap platform, and also serve as a positioning part to provide accurate positioning for the segment connection of the column segments during on-site assembly. The prestressed tendons are set through each column section section of corrugated pipe.

C. Brushing cementing material: Brush cementing material evenly on the end face of the joint between the column segments and between the column segment and the cap, and inject the cementing material into the connecting channel of the shear reinforcement at the same time. The cementing material is One of resin-based cementitious materials or cement-based cementitious materials.

D. Hoisting column section: hoist the prefabricated composite pipe seawater sea sand concrete column section on the connection plane of the cap platform, and then hoist the next composite pipe seawater sea sand concrete column section in turn, between the column section and the cap platform or A pair or more than one pair of convex ribs and grooves between two adjacent composite pipe seawater sea sand concrete column segments are socketed one by one according to the shape, size and direction, and the shear reinforcement and grooves inside the convex ribs The internal connecting channels are connected to each other correspondingly. When hoisting, the prestressed tendons run through the corrugated pipes of each column segment.

E. Repeat the hoisting column section: repeat the above step D, and install the composite pipe seawater sea sand concrete column section in sequence until the height requirement of the pier column is met.

F. Tensioning and anchoring prestressed tendons: Tensioning prestressed tendons, the tension end is located on the top of the prefabricated composite pipe seawater sea sand concrete pier, and the end of the prestressed tendons is fixed by anchors, and the grouting is anchored after meeting the requirements.

The invention has the advantages of good durability, high bearing capacity, good corrosion resistance, easy access to materials, and is conducive to sustainable development. At the same time, the structure has the advantages of large-scale prefabrication, transportation, convenient installation, short construction period, low energy consumption, Environmental pollution is small. The specific beneficial effects are as follows;

(1) The construction area is small and the construction period is short. The prefabricated composite pipe seawater sea sand concrete pier can be prefabricated in sections, standardized and large-scale in the prefabrication site according to the height requirements of the pier on site, and the vibration and maintenance can meet the ideal requirements, which has a high guarantee rate for the project quality and can be assembled on site The construction progress was accelerated and the construction period was shortened.

(2) Good durability. The composite pipe is composed of the inner fiber layer and the outer fiber layer respectively bonded to the inner wall and outer wall of the steel pipe. The shear reinforcement is stainless steel reinforcement, stainless steel pipe, composite material reinforcement, composite material pipe, fiber and steel composite reinforcement or fiber Composite pipes and steel, the main material has the ability to resist the corrosion of chloride ions in seawater and sea sand concrete, and realizes the direct utilization of seawater and sea sand resources.

(3) Good integrity. The shape, size and direction correspond to the socket connection between the convex rib and the groove, the anchor connection between the shear reinforcement and the connecting channel, and the joints of the column sections are all coated with cementing material, which improves the overall pier Integrity and shear capacity of joints.

(4) High carrying capacity. The composite pipe provides sufficient circumferential restraint for the internal seawater and sea sand concrete, which fully improves the bearing capacity of the assembled composite pipe seawater and sea sand concrete pier.

(5) Conducive to sustainable development. The invention enables the direct application of the seawater and sea sand concrete in the composite pipe concrete, the sea water and sea sand are inexhaustible raw materials, and the demand for fresh water and river sand is reduced. Compared with the traditional cast-in-place construction technology, a large number of brackets and formwork can be saved during the construction process, achieving the purpose of saving wood and benefiting the sustainable development of the environment.

Description of drawings:

Fig. 1 is a three-dimensional exploded schematic diagram of a prefabricated composite pipe seawater sea sand concrete pier;

Fig. 2 is a schematic sectional view of an assembled composite pipe seawater sea sand concrete pier;

Fig. 3 is a three-dimensional schematic diagram of a column section of an assembled composite pipe seawater sea sand concrete pier;

Fig. 4 is a schematic diagram of the longitudinal section of the assembled composite pipe seawater sea sand concrete pier column segment with a pair of convex rib grooves;

Fig. 5 is a schematic diagram of the longitudinal section of the assembled composite pipe seawater sea sand concrete pier column section with two pairs of convex rib grooves;

Fig. 6 is a schematic diagram of a rectangular cross-section of a section of an assembled composite pipe seawater sea sand concrete pier column segment with a pair of convex rib grooves;

Fig. 7 is a schematic diagram of a rectangular cross-section of an assembled composite pipe seawater sea sand concrete pier column segment with two pairs of convex rib grooves;

Fig. 8 is a schematic diagram of a rectangular cross-section of a section of an assembled composite pipe seawater sea sand concrete pier column segment provided with a pair of bidirectional convex rib grooves;

Fig. 9 is a schematic diagram of a circular cross-section of an assembled composite pipe seawater sea sand concrete pier column segment with a pair of convex rib grooves;

Fig. 10 is a schematic diagram of a circular cross-section of an assembled composite pipe seawater sea sand concrete pier column section with two pairs of convex rib grooves;

Fig. 11 is a schematic diagram of a circular cross-section of an assembled composite pipe seawater sea sand concrete pier column section with a pair of bidirectional convex rib grooves;

Fig. 12 is a process flow chart of a manufacturing method of an assembled composite pipe seawater sea-sand concrete pier.

In accompanying drawings 1 to 12, 1 is a composite pipe; 2 is seawater sea sand concrete; 3 is a corrugated pipe; 4 is a prestressed tendon; 5 is a groove; 6 is a convex rib; 7 is a shear reinforcement; 11 12 is a steel pipe; 13 is an inner fiber layer; 100 is a composite pipe seawater sea sand concrete column segment; 200 is a cap; 300 is an anchor.

Detailed ways:

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention will now be described with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following specific examples.

An assembled compound pipe seawater sea sand concrete bridge pier, the structure is composed of a plurality of superimposed composite pipe seawater sea sand concrete column segments 100, which are connected as a whole through post-tensioning prestressing, which is characterized in that the Composite pipe seawater sea sand concrete pier column segment 100 is composed of composite pipe 1, seawater sea sand concrete 2, corrugated pipe 3, prestressed reinforcement 4, and shear reinforcement 7. Composite pipe 1 is composed of inner fiber layer 13, outer fiber layer 11 are respectively bonded to the inner wall and outer wall of the steel pipe 12. The thickness of the composite pipe 1 gradually increases from the top of the pier to the bottom of the pier. There are one pair and one pair The above convex rib 6 and groove 5, the shape and size of the convex rib 6 and groove 5 match each other, and play the role of socket connection and shear resistance. Seawater sea-sand concrete bridge pier column segment 100 is provided with corrugated pipe 3 along the height direction, and one or more prestressed tendons 4 are arranged around the cross-section and run through the corrugated pipe 3 arranged in each column segment. One end of the rib 4 is fixedly arranged inside the platform 200 and serves as a positioning part.

The cross-sectional shape of the composite pipe seawater sea sand concrete column segment 100 is a chamfered rectangle, circle, ellipse, or dumbbell shape, and the outer surfaces of each column segment have the same size and are neat and smooth.

The inner fiber layer 13 and the outer fiber layer 11 can be made of glass fiber, carbon fiber, aramid fiber, basalt fiber or a mixture of several of them, and the angle between the fiber direction and the component axis direction is between 0 and Between 90°, the bonding glue is epoxy resin glue, and the bonding and compounding with the inner and outer walls of the steel pipe is realized by hand lay-up lamination process, vacuum assisted forming process or mechanical winding process.

The seawater sea sand concrete 2 is prepared by using seawater and sea sand as raw materials, adding cement, gravel, water reducer, and expansion agent.

The corrugated pipe 3 is made of rubber, plastic or composite material, and its plane position and size on each column segment are the same and correspond to each other.

The shear reinforcement 7 is one or more stainless steel reinforcement, stainless steel pipe, composite material reinforcement, composite material pipe, fiber and steel composite reinforcement or fiber and steel composite pipe, anchored to the convex rib of each column segment 6, the anchorage length is greater than the height of the convex rib 6, and the groove 5 corresponding to the column segment is provided with a shear reinforcement connecting channel, the size of the connecting channel is greater than or equal to the size of the shear reinforcement 7, and the shear reinforcement 7 and the connecting channel are cemented material after anchoring.

The prestressed tendons 7 are composite material tendons, composite material cables, composite material and steel composite bars, composite material and steel composite cables.

The cementing material is one of resin-based cementing material or cement-based cementing material.

A method for manufacturing an assembled composite pipe seawater sea sand concrete pier is characterized in that it at least includes the following steps:

A. Prefabricated column segment: Prefabricate multiple composite pipe seawater sea sand concrete column segments 100 according to the predetermined cross-sectional shape and size. During prefabrication, first process the steel pipe 12 with the required thickness, and bond the inner fiber layer according to the predetermined angle and number of layers 13 and the outer fiber layer 11 form a composite pipe 1, pour and maintain seawater sea-sand concrete with a predetermined mix ratio to obtain a composite pipe seawater sea-sand concrete column segment 100, and every two composite pipe seawater sea-sand concrete pier column sections are jointed A pair or more than one pair of convex ribs 6 and grooves 5 are arranged between them. The shape and size of the convex ribs 6 and grooves 5 match each other. Among the convex ribs 6 of each column segment.

B. Arrangement of prestressed tendons: fix one end of prestressed tendons 4 in the connection plane of bearing platform 200 in advance, and also serve as a positioning part to provide precise positioning for segmental connection during on-site assembly of column segments. Prestressed tendons 4 are set through each Inside the corrugated pipe 3 of a column segment.

C. Brushing cementing material: Brush cementing material evenly on the end face of the joint between the column segments and between the column segment and the cap, and inject the cementing material into the connecting channel of the shear reinforcement at the same time. The cementing material is One of resin-based cementitious materials or cement-based cementitious materials.

D. Hoisting column section: hoist the prefabricated composite pipe seawater sea sand concrete column section 100 on the connection plane of the cap 200, and then hoist the next composite pipe seawater sea sand concrete column section 100 in turn, the column section and the cap A pair or more than one pair of convex ribs 6 and grooves 5 between or between two adjacent composite pipe seawater sea sand concrete column segments are inserted one by one according to the shape, size and direction, and the inside of the convex ribs 6 The shear ribs 7 and the connecting channels inside the grooves 5 are connected to each other correspondingly. During hoisting, the prestressed tendons 4 run through the corrugated pipes 3 arranged in each column segment.

E. Repeat the hoisting of column sections: repeat the above step D, and successively superimpose and install composite pipe seawater sea sand concrete column sections 100 until the height requirements of the pier column are met.

F. Tensioning and anchoring prestressed tendons: tensioning prestressed tendons 4, the tensioned end is located on the top of the prefabricated composite pipe seawater sea sand concrete bridge pier, the end of the prestressed tendons is fixed by anchor 300, and the grouting is anchored after meeting the requirements.

In the present invention, an assembled composite pipe seawater sea-sand concrete bridge pier and its manufacturing method, combined application of composite pipe, seawater sea-sand concrete and prefabricated assembly technology, obtains a high-efficiency, economical, durable, corrosion-resistant, environmentally friendly, A new structure that is easy to standardize and industrialize, especially suitable for marine engineering structures in harsh marine environments.

Claims (9)

1. a kind of assembled multiple tube seawater marine sand concrete bridge pier, the structure is mixed by multiple stackable multiple tube seawater sea sands Solidifying native column section (100) composition, is connected by post-stress and is integrated, it is characterised in that described multiple tube sea Water marine sand concrete pier column section (100) is by multiple tube (1), seawater marine sand concrete (2), corrugated conduit (3), prestressing force Muscle (4), shearing resistance muscle (7) collectively form, and multiple tube (1) is bonded in steel pipe respectively by interior fibrous layer (13), outer fibre layer (11) (12) inner and outer wall is formed, and multiple tube (1) thickness is gradually increased by pier top to pier bottom, and each two multiple tube seawater sea sand is mixed Coagulate and be provided with a pair and more than a pair fins (6) and groove (5) between native pier column section (100) seam, fin (6) and recessed The shape and size of groove (5) are mutually matched, and are played socket joint connection shearing resistance effect, are passed through cementing material between fin (6) and groove (5) After bond, each multiple tube seawater marine sand concrete pier column section (100) is provided with corrugated conduit (3) along short transverse, One and more than one presstressed reinforcing steel (4) are arranged along section surrounding, and are disposed through the corrugated conduit (3) of each column section Interior, presstressed reinforcing steel (4) one end is fixedly installed on inside cushion cap (200) and also serves as keeper.

2. a kind of assembled multiple tube seawater marine sand concrete bridge pier according to claim 1, it is characterised in that described The shape of cross section of multiple tube seawater marine sand concrete column section (100) is chamfering rectangle, circle, ellipse or dumb-bell shape, The exterior surface dimension of its each column section is in the same size, corresponding neat smooth.

3. a kind of assembled multiple tube seawater marine sand concrete bridge pier according to claim 1, it is characterised in that described Interior fibrous layer (13) and outer fibre layer (11) can be glass fibre, carbon fiber, aramid fiber, one kind in basalt fibre or its In several specific admixtures form, machine direction and component axis angular separation are between 0~90 °.

4. a kind of assembled multiple tube seawater marine sand concrete bridge pier according to claim 1, it is characterised in that described Using seawater and sea sand as raw material, addition cement, rubble, water reducer, swelling agent are formulated seawater marine sand concrete (2).

5. a kind of assembled multiple tube seawater marine sand concrete bridge pier according to claim 1, it is characterised in that described Corrugated conduit (3) is that rubber, plastics or composite make, and its plan-position on each column section is identical with size simultaneously It is mutually corresponding.

6. a kind of assembled multiple tube seawater marine sand concrete bridge pier according to claim 1, it is characterised in that described Shearing resistance muscle (7) is that one and more than one stainless reinforcing bar, stainless steel tube, composite material bar, composite material tube, fiber and steel are compound Muscle or fiber and steel pipe, it is anchored among the fin (6) of each column section, anchorage length is more than the height of fin (6), Shearing resistance muscle connection duct is provided with the groove (5) of corresponding column section, connection pore size is more than or equal to shearing resistance muscle (7) chi Very little, shearing resistance muscle (7) is with being connected duct by being anchored after cementing material.

7. a kind of assembled multiple tube seawater marine sand concrete bridge pier according to claim 1, it is characterised in that described Presstressed reinforcing steel (7) is composite material bar, composite rope, composite and steel composite reinforcing, composite and the compound rope of steel.

A kind of 8. assembled multiple tube seawater marine sand concrete bridge pier according to claim 1 or 6, it is characterised in that institute The cementing material stated is one kind in resin base cementing material or cement base cementing material.

9. a kind of preparation method of assembled multiple tube seawater marine sand concrete bridge pier, it is characterised in that including at least following steps Suddenly：

A. prefabricated stand column section：According to predetermined cross sectional shape and the prefabricated multiple multiple tube seawater marine sand concrete column sections of size Section (100), when prefabricated, the steel pipe (12) of process requirements thickness first, according to predetermined angular and the number of plies bond in fibrous layer (13) Multiple tube (1) is formed with outer fibre layer (11), poured with predetermined match ratio, conserve seawater marine sand concrete, obtains multiple tube sea Water marine sand concrete column section (100), set between each two multiple tube seawater marine sand concrete pier column segmental joints There are a pair and more than a pair fins (6) and groove (5), the shape and size of fin (6) and groove (5) are mutually matched, when prefabricated, Corrugated conduit (3) and shearing resistance muscle (7) are set, and shearing resistance muscle (7) is anchored among the fin (6) of each column section.

B. arrangement prestress muscle：One end of presstressed reinforcing steel (4) is fixed in cushion cap (200) connection plane in advance, also serves as positioning Part, for column section assembled in situ when section connection precise positioning is provided, presstressed reinforcing steel (4) is disposed through each column section Corrugated conduit (3) in.

C. brushing cementing material：The end face of seam between column section, between column section and cushion cap equably brushing adhesive Material is tied, while cementing material is injected in the connection duct of shearing resistance muscle, cementing material is resin base cementing material or cement base One kind in cementing material.

D. hoisting upright column section：Prefabricated multiple tube seawater marine sand concrete column section (100) is lifted on cushion cap (200) even Connect in plane, lift next multiple tube seawater marine sand concrete column section (100) successively, between column section and cushion cap or A pair between the two neighboring multiple tube seawater marine sand concrete column section of person and more than one pair of fin (6) and groove (5) The connection duct of socket joint, the internal shearing resistance muscle (7) of fin (6) and groove (5) inside is corresponded according to shape, size and direction Mutually corresponding connection, during lifting, presstressed reinforcing steel (4) is disposed through in the corrugated conduit (3) of each column section.

E. hoisting upright column section is repeated：Repeat the above steps D, is sequentially overlapped installation multiple tube seawater marine sand concrete column section (100), until meeting the requirement of pier column height.

F. stretch-draw anchor presstressed reinforcing steel：Tensioned prestressing bar (4), stretching end are located at assembled multiple tube seawater marine sand concrete bridge Pier top portion, by the end of the fixed presstressed reinforcing steel of anchorage (300), slurry seal anchors after reaching requirement.