CN212642165U

CN212642165U - Tensioning device for pre-tensioning method prestressed cast-in-place frame beam

Info

Publication number: CN212642165U
Application number: CN202020826365.0U
Authority: CN
Inventors: 章春娣; 潘书才; 徐小明; 季荣华
Original assignee: Changzhou Vocational Institute of Engineering
Current assignee: Changzhou Vocational Institute of Engineering
Priority date: 2020-05-18
Filing date: 2020-05-18
Publication date: 2021-03-02
Anticipated expiration: 2030-05-18

Abstract

The utility model discloses a tensioning equipment of cast-in-place frame roof beam of pretension method prestressing force, when sharp cloth muscle, tensioning equipment includes stretch-draw pedestal and jack, and the top both sides at the lower floor frame post of cast-in-place frame roof beam are established to the stretch-draw pedestal, and the both ends of sharp steel strand wires are fixed to the stretch-draw pedestal to utilize the jack to stretch-draw. When the broken lines are provided with the ribs, the tensioning device further comprises a steering pull rod and a steering pressure rod, the steering pull rod is arranged on the broken line steel stranded wire and between the two frame columns, the upper end of the steering pull rod hooks the steel stranded wire, the lower end of the steering pull rod is provided with two branches, the two branches are respectively connected with a cable, and the lower end of the cable is fixed with the lower frame column; and a steering pressure rod is arranged at the support of the cast-in-place frame beam, the upper end of the steering pressure rod supports the broken line steel strand, and the steering pressure rod is embedded in the lower-layer frame column. The utility model discloses the utilization lower floor's frame post and the frame roof beam of having pour establish prestretching as the stress point, need not pedestal or rigid template, and the construction is fairly simple, and is with low costs, and economic nature is good.

Description

Tensioning device for pre-tensioning method prestressed cast-in-place frame beam

Technical Field

The utility model particularly relates to a tensioning equipment of pretensioning method prestressing force cast-in-place frame roof beam.

Background

Pretensioned prestressed concrete elements are generally prefabricated elements which are produced in the factory and transported to the site for installation. Such prefabricated units are generally suitable for prefabricated floor panels. For concrete frame beams, the national standard has high requirements on the connecting nodes of frame beam columns, and the concrete frame beams can be generally realized by cast-in-place. Although there are prefabrication cases for frame beams in China, the prefabricated beams are complicated to manufacture, and the connection method of the prefabricated beams and the frame columns is also very complicated, so that the application is limited greatly.

Most of the existing prestressed frame beams adopt post-tensioning prestressing. When the beam steel bars are bound, the corrugated pipes are placed in advance, after concrete is poured and strength is achieved, prestressed steel bar wires are inserted into the corrugated pipes, two ends of each corrugated pipe are stretched and anchored by an anchorage device, then holes are grouted, and anchoring ends are blocked by concrete. The post-tensioning prestressed concrete structure is well-established. But the construction is relatively complicated and the economical efficiency is poor, so that the application is less at present.

Disclosure of Invention

In order to overcome the shortcoming and the deficiency that exist among the prior art, the utility model aims to provide a tensioning equipment of pretension method prestressing force cast-in-place frame roof beam utilizes lower floor's frame post and the frame roof beam of having pour as the stress point, establishes the pretension, need not solid fixed pedestal or rigid template, and the construction is fairly simple, and is with low costs, and economic nature is good.

The utility model provides a technical scheme that its technical problem adopted is:

when the ribs are linearly arranged in the cast-in-place frame beam, the tensioning device comprises a tensioning pedestal and a jack, wherein the tensioning pedestal is arranged on two sides of the top end of a lower-layer frame column of the cast-in-place frame beam, the tensioning pedestal fixes two ends of a linear steel strand in the cast-in-place frame beam, and the jack is used for tensioning.

Furthermore, a plurality of steel bars are arranged in the cast-in-place frame beam, wherein the prestressed tendons are arranged at the centroid position of the frame beam.

Furthermore, the tensioning pedestal is of a right-angled triangle structure, a right-angled side on one side is fixed against the frame column, and the other right-angled side is perpendicular to the frame column.

A tensioning device of a pre-tensioning method prestressed cast-in-place frame beam comprises a tensioning pedestal, a jack, a steering pull rod and a steering pressure rod, wherein the tensioning pedestal is arranged on two sides of the top end of a lower-layer frame column at two ends of the cast-in-place frame beam, fixes two ends of a broken-line steel strand in the cast-in-place frame beam, and is used for tensioning by the jack when ribs are distributed on broken lines of the cast-in-place frame beam; the steering pull rod is arranged on the fold line steel strand and between the two frame columns, the upper end of the steering pull rod hooks the steel strand, the lower end of the steering pull rod is provided with two branches, the two branches are respectively connected with a cable, and the lower end of the cable is fixed with the lower frame column; the support of the cast-in-place frame beam is provided with the steering pressure rod, the upper end of the steering pressure rod supports the broken line steel strand, and the steering pressure rod is embedded in the lower-layer frame column.

Furthermore, the lower end of the mooring rope is anchored on the lower-layer frame column by adopting an angle steel matched screw rod.

The traditional pretensioning method generally needs a fixed pedestal or a rigid template for tensioning to bear the force exerted on the steel strand in advance, after the concrete is poured and reaches the strength, the two ends are placed to be tensioned, the two ends are anchored by the bond stress between the steel strand and the concrete, and the prestress is built in the concrete. And utilize the utility model discloses when carrying out the cast in situ concrete, do not possess pedestal or rigid template, its lower floor's frame post and the frame roof beam that utilizes to pour establish prestretching force as the stress point, need not pedestal or rigid template, and the construction is fairly simple, and is with low costs, and economic nature is good.

Drawings

FIG. 1 is an elevation view of a frame during linear rib laying;

FIG. 2 is an elevation view of the frame with the ribs laid in the fold lines;

FIG. 3 is a detail view of the table base with ribs arranged linearly;

FIG. 4 is a detail view of the pedestal with the ribs arranged in the fold lines;

FIG. 5 is a partial cross-sectional view of section 1-1 of FIG. 2;

FIG. 6 is a partial cross-sectional view taken at 2-2 of FIG. 2;

FIG. 7 is a detailed view of the anchoring of the cable to the post of FIG. 2;

FIG. 8 is a detail view of the steering linkage of FIG. 2;

the steel structure comprises 1-frame columns, 2-frame beams, 3-linear steel strands, 4-jacks, 5-tensioning pedestals, 6-broken line steel strands, 7-steering pull rods, 8-steering compression rods, 9-cables, 10-turn bolts, 11-connecting bolts, 12-screws, 13-angle steels and 14-nuts.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Fig. 1 shows a situation of linear rib arrangement, which is generally used for building a pre-stress in a floor frame beam 2 when a structure is over-long, so as to prevent the frame beam 2 from shrinking cracks. Only the two end frame columns 1 are provided with the tensioning pedestals 5 (as shown in fig. 1 and 3), the tensioning pedestals 5 are symmetrically arranged, and the tensioning pedestals 5 fix the two ends of the linear steel strand 3; when the frame beam 2 is manufactured, a template is firstly supported, reinforcing steel bars are bound, then tensioning is carried out, concrete is poured, and tensioning is carried out. In this way, the prestressing tendons are generally arranged at the centroid of the frame beam 2 in order to establish a uniform prestressing force on the cross section of the frame beam 2 without creating flexural load bearing forces.

Fig. 2 shows a case of arranging the reinforcement in the fold line, wherein the two end frame columns 1 are provided with tensioning pedestals 5 (as shown in fig. 2), the tensioning pedestals 5 are symmetrically arranged, and the tensioning pedestals 5 fix the two ends of the steel strand 3.

In addition, if non-prestressed reinforcement is saved and bending bearing capacity is generated, the reinforcement is distributed by fold lines, namely shown in fig. 2. In order to let the steel strand buckle, need set up and turn to the device: the steering device in the beam span is in tension and is called a steering pull rod 7 (the steering pull rod 7 is arranged on the steel strand and between the two frame columns 1, the upper end of the steering pull rod 7 hooks the steel strand, the lower end of the steering pull rod 7 is provided with two branches, the two branches are respectively connected with a cable 9), the cable 9 is anchored at the bottom of the next layer of frame column 1 (as shown in figure 2), wherein the lower end of the cable 9 and the frame column 1 can be anchored by adopting an angle steel 13 matched with a screw 12 (as shown in figure 7), the upper end of the cable 9 is provided with a special steering pull rod 7 (as shown in figure 2 and figure 8), and the steering pull rod 7 is a pre-embedded steel plate matched.

And in the support of frame roof beam 2, need to set up and turn to depression bar 8 (as shown in fig. 2), turn to the depression bar 8 upper end and support broken line steel strand wires 6, turn to the depression bar 8 and pre-buried in frame post 1.

The steel strand is made to be similar to the bending moment by the broken line arrangement of the ribs, and the bearing capacity is greatly improved. And the subsequent operation is not needed after the sheet is placed, so that the operation is very convenient.

The operation flow when the frame beam 2 shown in fig. 1 is linearly ribbed is as follows:

1. pouring a first-layer column to the bottom of a beam, namely a construction joint below a second-layer floor in the figure 1;

2. supporting a second floor beam plate template, and binding common steel bars in the beams;

3. respectively installing tensioning devices (namely, tensioning pedestals 5 are arranged at two ends of the frame beam 2 and positioned on the side surface of the frame column 1); arranging steel strands;

5. tensioning;

6. and pouring concrete, maintaining, and after the strength is reached, releasing the two ends to finish the process.

The operation flow when the frame beam 2 is ribbed by the folding line as shown in fig. 2 is as follows:

1. pouring the first-layer column to the beam bottom, namely the construction joint below the second-layer floor in fig. 2;

3. respectively installing tensioning devices (column feet and column tops);

4. arranging steel strands;

5. tensioning;

The above description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The tensioning device for the pre-tensioning prestressed cast-in-place frame beam is characterized by comprising a tensioning pedestal and a jack, wherein the tensioning pedestal is arranged on two sides of the top end of a lower-layer frame column of the cast-in-place frame beam, the tensioning pedestal fixes two ends of a linear steel strand in the cast-in-place frame beam, and the jack is used for tensioning.

2. A tensioning device for a pretensioned prestressing cast in place frame beam according to claim 1, wherein a plurality of reinforcing bars are provided in the cast in place frame beam, wherein the prestressing bars are provided at the centroid position of the frame beam.

3. A tensioning device for a pretensioned prestressing cast in place frame beam according to claim 1 or 2, wherein the tensioning mounts are arranged in a right triangle configuration, one side of which is fixed against the frame column and the other side is arranged perpendicular to the frame column.

4. A tensioning device of a pretensioned prestressing cast-in-place frame beam is characterized by comprising a tensioning pedestal, a jack, a steering pull rod and a steering compression rod,

the tensioning pedestal is arranged on two sides of the top end of the lower-layer frame column at two ends of the cast-in-place frame beam, fixes two ends of a broken-line steel strand in the cast-in-place frame beam and utilizes a jack to perform tensioning;

the steering pull rod is arranged on the fold line steel strand and between the two frame columns, the upper end of the steering pull rod hooks the steel strand, the lower end of the steering pull rod is provided with two branches, the two branches are respectively connected with a cable, and the lower end of the cable is fixed with the lower frame column;

the support of the cast-in-place frame beam is provided with the steering pressure rod, the upper end of the steering pressure rod supports the broken line steel strand, and the steering pressure rod is embedded in the lower-layer frame column.

5. A tensioning device for a pretensioned prestressing cast in place frame beam according to claim 4, wherein the tensioning mounts are arranged in a right triangle configuration, one side of which is fixed against the frame column and the other side of which is arranged perpendicular to the frame column.

6. A tensioning device for a pretensioned prestressed cast in place frame beam according to claim 4 or 5 wherein the lower end of the cable is anchored to the underlying frame column using angle steel fitted screws.