CN107288029A - The method for making square column type performance of concrete column confined - Google Patents

Abstract

The invention discloses a kind of method for making square column type performance of concrete column confined, methods described includes：1）Make cushion cap；2）Dismounting template lower end will be exempted to be connected with cushion cap upper end；3）Cushion cap and exempt from dismounting template enclosed space in build pier core reinforcing bar；4）The casting concrete in the endoporus for exempting to dismantle template, after concrete setting, square column type performance of concrete column confined completes, and exempts to dismantle the layer structure of template formation square column type performance of concrete column confined；The method have the benefit that：A kind of method for making square column type performance of concrete column confined is proposed, after this method, can significantly reduce the construction period, construction cost is reduced, the square column type performance of concrete column confined quality produced is preferable.

Description

Method for making square column concrete piers

technical field

The invention relates to a technology for manufacturing concrete piers, in particular to a method for manufacturing square-column concrete piers.

Background technique

Column pier is the pier form widely used in highway bridges at present; when making column pier in the prior art, the pier body reinforcement and column formwork are generally built on the cap platform, and the column formwork is located on the periphery of the pier body reinforcement. Concrete is poured into the formwork to form the bridge pier, and after the pier is formed, the column formwork is removed; the existing problems are: 1) The common column formwork is generally wood formwork or steel formwork, and the wood formwork is easily damaged during construction, and may It needs to be replaced many times, and the steel formwork is prone to corrosion in the underwater part, which cannot be used again, and the material loss is large; 2) The commonly used column formwork needs to be assembled section by section, which is prone to installation defects, resulting in construction joints and deformation cracks. If the joints are not strict, it is easy to cause grout leakage; 3) After the column formwork is removed, there are many joints on the surface of the pier, which affects the quality and appearance of the pier body. Therefore, after the column formwork is removed, the surface of the pier body usually needs to be modified , more troublesome; 4) In the column type pier project, the construction and dismantling of the column formwork are relatively cumbersome, and the amount of labor and construction period occupied are relatively large. Generally speaking, the installation and disassembly of the existing column formwork are cumbersome, the construction period is long, and problems such as cracks on the pier body surface are prone to occur.

Contents of the invention

Aiming at the problems in the background technology, the present invention proposes a method for making square-column concrete piers, the innovation of which is that the method includes:

1) Make the platform;

2) Connect the lower end of the non-disassembly formwork to the upper end of the platform;

3) Build pier core steel bars in the space enclosed by the cap and non-disassembly formwork; in the prior art, the steel bars inside the pier column are generally called pier body reinforcement. Therefore the inventor refers to the internal reinforcement as pier core reinforcement;

4) Concrete is poured in the inner hole of the non-removable formwork. After the concrete is solidified, the square-column concrete pier is completed, and the non-detachable formwork forms the outer structure of the square-column concrete pier;

The demolition-free formwork is composed of a steel skeleton, a plurality of studs and a concrete cladding; the steel skeleton is a cylindrical structure, the cross section of the cylindrical structure is rectangular, and the concrete cladding wraps the steel skeleton, and the steel The skeleton and the concrete cladding form a cylindrical reinforced concrete structure with a rectangular cross section; one end of the stud is fixedly connected to the steel skeleton, and the other end of the stud protrudes from the inner hole wall of the cylindrical reinforced concrete structure , the length of the exposed section of the stud is much smaller than the radial dimension of the tubular reinforced concrete structure; multiple studs are evenly distributed on the inner hole wall of the tubular reinforced concrete structure; the disassembly-free formwork is a prefabricated part, which is transported to the construction when it is used on site.

After adopting the scheme of the present invention, there is no need to build column formwork on site, and the disassembly-free formwork can be prefabricated in the factory, and then transported to the construction site when used, which can effectively shorten the construction period, and process the disassembly-free formwork in the factory, which can effectively reduce the processing cost , the outer wall of the disassembly-free formwork can be modified at the time of production, and the produced pier does not need to be surface-modified, and the construction operation is relatively simple. In addition, the disassembly-free formwork directly forms the outer structure of the square column concrete pier , there is no need to dismantle, the corresponding dismantling cost and construction period can be saved, and there will be no grout leakage during the pouring process, and the project quality can be effectively guaranteed; the densely and evenly distributed studs are used as shear connectors, which can effectively improve the freedom of construction. The tightness of the connection between the dismantled formwork and the internal concrete makes the newly poured reinforced concrete and the dismantled formwork form a solid overall force-bearing structure. During the specific construction, operations such as concrete maintenance are also involved. Since these contents have little relevance to the innovations of the present invention, this article will not repeat them here. During specific implementation, those skilled in the art can choose the best from existing methods.

Preferably, the reinforcement skeleton is composed of multiple square annular steel bars and multiple straight steel bars; the square annular steel bars are coaxial with the cylindrical structure, and the multiple square annular steel bars are axially distributed along the cylindrical structure The axial direction of the straight steel bar is parallel to the axial direction of the cylindrical structure, the single straight steel bar is fixedly connected with multiple square circular steel bars, and the multiple straight steel bars are distributed along the circumferential direction of the cylindrical structure. The specific reinforcement method, steel bar size and concrete label can be reasonably determined by those skilled in the art according to the existing reinforced concrete structure strength design theory.

Preferably, in step 3), after the dismantling-free formwork is installed in place, the cable wind rope is arranged on the outer wall of the dismantling-free formwork; after the square column-shaped concrete pier is fabricated, the cable wind rope is removed. Setting the cable wind rope is a common means in the prior art. After it is combined with the present invention, it can prevent the disassembly-free formwork from overturning during the construction process.

Preferably, the upper and lower ends of the disassembly-free formwork are provided with reserved ribs; in step 3), when the disassembly-free formwork is connected to the cap, the reserved ribs at the lower end of the disassembly-free formwork and the pre-embedded ribs on the cap Fixed connection. The reserved ribs at the upper end of the disassembly-free formwork are used to connect the pre-embedded ribs on the cover beam.

Preferably, the concrete cladding is made of ultra-high performance concrete (UHPC) with a compressive strength of 120 MPa or more and a flexural strength of 30 MPa or more. Using this concrete to make the concrete cladding can effectively reduce the radial thickness of the disassembly-free formwork and weight, easy to transport and install. The mixing ratio of various components in concrete can adopt the following optimal plan: cement: silica fume: quartz sand: quartz powder: water reducing agent: water = 1:0.25:1.1:0.3:0.019:0.225, and mix more than 2% volume of steel fibers.

The beneficial technical effects of the present invention are: a method for making square column-shaped concrete piers is proposed. After adopting the method, the construction period can be greatly reduced, the construction cost can be reduced, and the quality of the produced square-column concrete piers is better.

Description of drawings

Figure 1. Schematic diagram of the cross-sectional structure of the formwork without disassembly;

Figure 2. Schematic diagram of the axial section structure of the formwork without disassembly;

Figure 3. Schematic diagram of the external structure of the formwork without disassembly;

The names corresponding to each mark in the figure are: square circular steel bar 1, straight steel bar 2, peg 3, and reserved bar 4.

detailed description

A method for making a square-column concrete pier, the innovation of which is that the method includes:

1) Make the platform;

2) Connect the lower end of the non-disassembly formwork to the upper end of the platform;

3) Build pier core reinforcement in the space surrounded by caps and non-disassembly formwork;

4) Concrete is poured in the inner hole of the disassembly-free formwork. After the concrete is solidified, the square column-shaped concrete pier is completed, and the disassembly-free formwork forms the outer structure of the square-column concrete pier column;

The demolition-free template is composed of a steel skeleton, a plurality of studs 3 and a concrete cladding; the steel skeleton is a cylindrical structure, the cross section of the cylindrical structure is rectangular, and the concrete cladding wraps the steel skeleton, The steel frame and the concrete cladding form a cylindrical reinforced concrete structure with a rectangular cross section; one end of the peg 3 is fixedly connected to the steel frame, and the other end of the peg 3 is inserted through the inner hole of the cylindrical reinforced concrete structure. protruding from the wall, the length of the exposed section of the stud 3 is much smaller than the radial dimension of the tubular reinforced concrete structure; multiple studs 3 are evenly distributed on the inner hole wall of the tubular reinforced concrete structure; the demolition-free template is a prefabricated part, using transported to the construction site.

Further, the reinforcement skeleton is composed of multiple square circular steel bars 1 and multiple straight steel bars 2; the square circular steel bars 1 are coaxial with the cylindrical structure, and the multiple square circular steel bars 1 are along the cylindrical structure. The axial distribution of the body; the axial direction of the straight steel bar 2 is parallel to the axial direction of the cylindrical structure, and the single straight steel bar 2 is fixedly connected with multiple square annular steel bars 1, and the multiple straight steel bars 2 Circumferential distribution of shaped structures. Both the square circular steel bar 1 and the straight steel bar 2 are threaded steel bars.

Further, in step 3), after the disassembly-free formwork is installed in place, the cable wind rope is installed on the outer wall of the disassembly-free formwork; after the square column-shaped concrete pier is fabricated, the cable wind rope is removed.

Further, the upper and lower ends of the disassembly-free formwork are provided with reserved ribs; in step 3), when the disassembly-free formwork is connected to the cap, the reserved ribs at the lower end of the disassembly-free formwork and the pre-embedded ribs on the cap Fixed connection.

Further, the concrete cladding is made of ultra-high performance concrete with a compressive strength of more than 120 MPa and a flexural strength of more than 30 MPa. The scheme of the present invention is particularly suitable for the construction of column type bridge piers with a height below 30 meters.

Claims (6)

1. a kind of method for making square column type performance of concrete column confined, it is characterised in that：Methods described includes：

1) cushion cap is made；

2) dismounting template lower end will be exempted to be connected with cushion cap upper end；

3) cushion cap and exempt from dismounting template enclosed space in build pier core reinforcing bar；

4) casting concrete in the endoporus for exempting to dismantle template, after concrete setting, square column type performance of concrete column confined completes, and exempts from Dismantle the layer structure of template formation square column type performance of concrete column confined；

The dismounting template of exempting from is made up of framework of steel reinforcement, multiple pegs (3) and concrete covering；The framework of steel reinforcement is tubular knot Structure body, the cross section of tubular structure body is rectangle, and framework of steel reinforcement is wrapped in interior, framework of steel reinforcement and concrete bag by concrete covering Layer forms the tubular reinforced concrete structure that cross section is rectangle；One end of the peg (3) is fixed with the framework of steel reinforcement to be connected Connect, the other end of peg (3) is prominent from the inner hole wall of the tubular reinforced concrete structure, the exposed segment length of peg (3) Much smaller than the radial dimension of tubular reinforced concrete structure；Multiple pegs (3) are on the inner hole wall of tubular reinforced concrete structure It is uniformly distributed；It is prefabricated component to exempt from dismounting template, is transported to job site when using again.

2. the method according to claim 1 for making square column type performance of concrete column confined, it is characterised in that：The framework of steel reinforcement by A plurality of side's steel hoop (1) and a plurality of vertical bar shaped reinforcing bar (2) composition；Side's steel hoop (1) and the tubular structure body are same Axle, a plurality of side's steel hoop (1) is axially distributed along tubular structure body；The axial direction of the vertical bar shaped reinforcing bar (2) and tubular structure body It is axially in parallel, wall scroll vertical bar shaped reinforcing bar (2) is fixedly connected with a plurality of side's steel hoop (1), and a plurality of vertical bar shaped reinforcing bar (2) is along cylinder Shape structure it is circumferentially distributed.

3. the method according to claim 1 for making square column type performance of concrete column confined, it is characterised in that：Step 3) in, exempt to tear open Unload after template is installed in place, cable wind rope is set on dismounting template outer wall is exempted from；After square column type performance of concrete column confined completes, by cable Wind rope is removed.

4. the method for the making square column type performance of concrete column confined according to claim 1,2 or 3, it is characterised in that：It is described to exempt to tear open The upper and lower ends for unloading template are provided with reserving rib；Step 3) in, exempt from dismounting template when being connected with cushion cap, will exempt to dismantle under template The reserving rib at end is fixedly connected with the embedded ribs on cushion cap.

5. the method for the making square column type performance of concrete column confined according to claim 1,2 or 3, it is characterised in that：The coagulation Native covering is made using more than compression strength 120MPa, rupture strength more than 30MPa ultra-high performance concrete.

6. the method according to claim 4 for making square column type performance of concrete column confined, it is characterised in that：The concrete covering Made using more than compression strength 120MPa, rupture strength more than 30MPa ultra-high performance concrete.