CN101538939B - Construction method for preset nut type steel-reinforced concrete compound pier template fixing device - Google Patents

Abstract

The invention discloses a preset nut type steel-reinforced concrete compound pier template fixing device and a construction method thereof. The fixing device mainly comprises a template, a nut, a screw rod, a PVC protecting pipe, an inner keel and an outer keel. The nut is welded on a steel column, the template surrounds the periphery of the steel column, the outer keel is arranged around the outer side of the template, the inner keel is arranged between the template and the outer keel, one end of the screw rod is connected with the nut by a thread, the PVC protecting pipe is sleeved on the screw rod, and the other end of the screw rod is fixed on the outer keel by a 3-shaped buckle. The invention has simple structure, low cost, and simple and convenient construction, solves the difficulty of fixing the steel-reinforced concrete compound pier template, is convenient for the field construction operation and lightens the workload and the labor intensity. The inner keel, the outer keel, the template and the screw rod can be repeatedly used so as to save the cost, ensure the construction safety of the template and improve the forming quality of the concrete column; meanwhile, the fixing device adopts common materials, thereby lowering the cost and being convenient for popularization and application.

Description

The job practices of preset nut type steel-reinforced concrete compound pier template fixing device

Technical field

The present invention relates to a kind of job practices of steel reinforced concrete coupled column fixing templates, belong to technical field of building construction.

Background technology

Fast development along with urban construction, increasing super highrise building emerges in large numbers in the city, for satisfying height, the requirement of spatial variations and structure stress, considerable super highrise building has adopted reinforced concrete composite structure, owing to be provided with steel column in the steel reinforced concrete coupled column, steel column can not arbitrarily be bored a hole, be used to build the concrete template of post and can't the lateral pressure that Screw arbor with nut at both-ends bears column template be set as the ordinary concrete post fixedly the time, the main before this method that adopts is to weld Screw arbor with nut at both-ends at the construction field (site) with fixed form on steel column, time-consuming, screw rod can't have enough to meet the need use, therefore design a kind of new steel reinforced concrete coupled column fixing templates, and propose targetedly that job practices has the realistic meaning of highly significant.

Summary of the invention

The objective of the invention is provides a kind of simple in structure at the fixing above shortcomings of existing steel reinforced concrete coupled column template, and cost is low, and easy construction is the preset nut type steel-reinforced concrete compound pier template fixing device job practices efficiently.

First purpose of the present invention is achieved in that the job practices of preset nut type steel-reinforced concrete compound pier template fixing device, may further comprise the steps:

1) according to the design of the lateral pressure of concreting, design preparation nut, screw rod, pvc pipe is determined the arrangement pitch of steel column top nut;

2) on steel column, unwrapping wire is located in the welded nut position, carry out the nut welding by the mast axis direction, weld bead height 4mm, site error is controlled in the 3mm, and the face of weld of steel column is parallel with template, and the bigger side parallels plate in slit is arranged between nut and the steel column; 3) with spanner one end of screw rod is screwed into nut before template is installed, puts pvc pipe;

4) determine the template position of opening according to the nut network for location on the steel column, draw template perforate figure, according to drawing perforate on template, perforate is corresponding with nut location;

5) mounting template, keelson, outer keel, template adopts the thick veneer of 18mm, template stands in the steel column periphery, keelson adopts 50mm * 100mm flitch, vertically be arranged on the template outside, spacing is less than 200mm, and outer keel adopts the two steel pipes of Φ 48 * 3.5mm, outer keel is located at the keelson periphery, and keelson squeezes and withstands template and outer keel.

6) screw rod passes the template perforate, and the other end of screw rod passes through " 3 " shape snap fit on outer keel.

The two steel pipes of described outer keel are connected and fixed by Screw arbor with nut at both-ends.

Stress performance according to concreting lateral pressure design formulas and nut, screw rod, weld seam calculates, designs specification, the spacing of screw rod, determines the spacing and the requirement of welding of nut size, specification and layout; Computational process is as follows:

1. column template characteristic value of load calculating newly placed concrete lateral pressure design formulas is the smaller value in the following formula:

$F=0.2{2\mathrm{\γ}}_{c}t{\mathrm{\β}}_1{\mathrm{\β}}_2\sqrt{V}$ F＝γ _cH

γ c---concrete unit weight wherein;

The initial setting time of t---newly placed concrete;

T---concrete molding temperature;

V---concrete speed of perfusion;

H---concrete lateral pressure calculating location place is to newly placed concrete end face overall height;

β 1---and Admixture influences correction factor;

β 2---and concrete slump influences correction factor.

2. the calculating of column template panel

Panel directly bears the load that template is transmitted, and calculates according to the three-span continuous beam under the evenly distributed load, is calculated as follows

(1) flexural strength is calculated

f＝M/W＜[f]

F---the flexural strength calculated value (N/mm2) of panel wherein;

The maximum bending moment (N.mm) of M---panel;

The net section resistance moment of W---panel;

The flexural strength design load of [f]---panel is got 15.00N/mm2;

M＝0.100ql2

Q---design load (kN/m) wherein;

(2) shearing resistance is calculated

T＝3Q/2bh＜[T]

(3) Calculation of Deflection

v＝0.677ql4/100EI＜[v]＝1/250

3. the calculating of flitch keelson

Perpendicular stupefied flitch directly bears the load that template is transmitted, and calculates according to the three-span continuous beam under the evenly distributed load, is calculated as follows

(1) flexural strength is calculated

Flexural calculation intensity f=M/W

(2) shearing resistance is calculated

The design formulas of maximum shear is as follows: Q=0.6ql

The cross section shear strength must satisfy: T=3Q/2bh＜[T]

(3) Calculation of Deflection

Maximum defluxion is less than 400.0/250.

4. the calculating of two steel pipe outer keels

Calculate maximal bending moment Mmax, maximum distortion vmax, maximum bearing power Qmax through continuous beam.

Flexural calculation intensity f=M/W

5. the calculating of screw rod

Design formulas: N＜[N]=fA

N---the pulling force that split bolt is suffered wherein;

A---split bolt effective area (mm2);

The tensile strength design load of f---split bolt is got 170N/mm2.

The present invention is simple in structure, and cost is low, and easy construction is quick, can solve the fixing difficult problem of steel reinforced concrete coupled column template, makes things convenient for on-site construction operations greatly, alleviates site work amount and labour intensity.Behind the profile steel concrete column concreting hardened forming, use the spanner rotary screw, remove screw rod and outer, keelson, template, not only inside and outside keel, template can be had enough to meet the need repeated use, and screw rod also can have enough to meet the need repeated use, have saved the screw rod material greatly, template construction safety and concrete column forming impression quality have been guaranteed, and adopt common material, cost economy, easy to utilize.

Description of drawings

The present invention is further illustrated below in conjunction with accompanying drawing.

Fig. 1 is the structural representation of round steel pipe for steel column of the present invention;

Fig. 2 is the structural representation of H type, cross material for steel column of the present invention.

Among the figure: 1 nut, 2 screw rods, 3 templates, 4 keelsons, 5 outer keels, 6 steel columns, 7PVC pipe, 8 " 3 " shape buckles

The specific embodiment

Embodiment one

It is round steel pipe that the preset nut type steel-reinforced concrete compound pier template fixing device of this example is used for steel column, and as shown in Figure 1, the construction concrete steps during structure are:

1, steel column 6 adopts round steel pipe, and nut 1 adopts the extended type nut, and to location, nut 1 position unwrapping wire, welding personnel carries out the nut welding by the mast axis direction on the round steel tubing string, weld bead height 4mm, and site error is controlled in the 3mm.The suitable parallels plate of the bigger side in slit between nut 1 and the steel pipe walls, weld bead height 4mm.

2, earlier screw rod 2 is screwed into nut 1 with spanner before template is installed, puts pvc pipe 7 on the screw rod 2, adjust direction.

3, determine the template position of opening according to steel pipe column nut network for location, draw template perforate figure, arrange carpenter's processing space special messenger to carry out blanking, perforate, guarantee that its position is accurate, reduce deviation with nut location according to drawing.

4, priority mounting template 3, keelson 4, outer keel 5, template adopts the thick veneer of 18mm, and keelson adopts 50mm * 100mm flitch, the vertical setting, spacing is not more than 200mm, the two steel pipes of outer keel employing Φ 48 * 3.5mm, spacing is not more than 400mm.

5, by " 3 " shape buckle 8 screw rod is fixed on the two steel pipes of outer keel, bears form lateral pressure.Final constitute M14 extended type nut 1 shown in Figure 1, Φ 14 screw rods 2 that screw thread is all established at two, the pvc pipe 7 of sheath screw rod, and the profile steel concrete column fixing templates of template 3, keelson 4, outer keel 5.

Embodiment two

It is H type, cross shaped steel that the preset nut type steel post reinforced concrete compound pier template fixing device of present embodiment is used for steel column, as shown in Figure 2, identical with embodiment 1 basic structure, difference is that preset nut 1 is to be welded in advance on steel column 6 column webs, before installing, template earlier screw rod 2 is screwed into nut 1 with spanner, screw rod 2 puts pvc pipe 7, first again back mounting pole template 3, keelson flitch 4, the two steel pipes 5 of outer keel.

In addition to the implementation, the present invention can also be the enforcement of fixing, construct of the reinforced concrete compound pier template of the steel column of other form of structure.

Claims (2)

1. the job practices of a preset nut type steel-reinforced concrete compound pier template fixing device is characterized in that may further comprise the steps:

1) according to the design of the lateral pressure of concreting, design preparation nut, screw rod, pvc pipe is determined the arrangement pitch of steel column top nut;

2) on steel column, unwrapping wire is located in the welded nut position, carry out the nut welding by the mast axis direction, weld bead height 4mm, site error is controlled in the 3mm, and the face of weld of steel column is parallel with template, and the bigger side parallels plate in slit is arranged between nut and the steel column;

3) with spanner one end of screw rod is screwed into nut before template is installed, puts pvc pipe;

4) determine the template position of opening according to the nut network for location on the steel column, draw template perforate figure, according to drawing perforate on template, perforate is corresponding with nut location;

5) mounting template, keelson, outer keel, template adopts the thick veneer of 18mm, template stands in the steel column periphery, keelson adopts 50mm * 100mm flitch, vertically be arranged on the template outside, spacing is less than 200mm, and outer keel adopts the two steel pipes of Φ 48 * 3.5mm, outer keel is located at the keelson periphery, and keelson squeezes and withstands template and outer keel.

6) screw rod passes the template perforate, and the other end of screw rod passes through " 3 " shape snap fit on outer keel.

2. the job practices of preset nut type steel-reinforced concrete compound pier template fixing device according to claim 4 is characterized in that the two steel pipes of described outer keel are connected and fixed by Screw arbor with nut at both-ends.

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