CN117107990A - Prefabricated steel frame-cast-in-situ concrete beam and construction method thereof - Google Patents

Abstract

The application discloses an assembled steel reinforcement framework-cast-in-situ concrete beam and a construction method thereof, wherein the assembled steel reinforcement framework comprises a formed steel reinforcement framework, the formed steel reinforcement framework comprises two groups of longitudinal steel bars which are vertically and symmetrically distributed, and a plurality of stirrups are longitudinally arranged on the whole outer parts of the two groups of longitudinal steel bars; the end parts of the adjacent longitudinal steel bars in each group are positioned at different positions in the axial direction; the two ends of each longitudinal steel bar are respectively prefabricated with a lengthened connecting wire head and a standard connecting wire head; the lengthened connecting screw head is sequentially provided with a sleeve locking nut fastener and a straight thread sleeve; the longitudinal steel bars are connected by adopting the straight thread sleeve, so that convenience is provided for on-site constructors to rapidly install the steel bar framework and detect the quality, on-site construction efficiency is greatly improved, meanwhile, the construction quality of the concrete beam is ensured, and the technical problems of low connection quality and high construction difficulty of the assembled concrete structure in the prior art are solved.

Description

Prefabricated steel frame-cast-in-situ concrete beam and construction method thereof

Technical field

The invention belongs to the field of construction technology and relates to cast-in-place concrete beams, specifically an assembled steel frame-cast-in-place concrete beam and its construction method.

Background technique

Prefabricated buildings have technical advantages such as low energy consumption, high quality, and low cost. The development of prefabricated buildings has become an important way to realize the industrialization of construction in my country. However, with the engineering practice and experience summary, there are still a lot of problems in the production, transportation, installation, connection and other aspects of traditional prefabricated building components. Compared with on-site manual work, manual tying of steel skeletons has disadvantages such as heavy workload, high-altitude operations, poor working environment, and high labor requirements; compared with traditional prefabricated buildings, prefabricated concrete structures have post-cast joints that affect the structure. Integrity, and the connection quality and installation efficiency of wet connection methods are difficult to guarantee.

Therefore, there is an urgent need for an innovative construction model that can ensure both construction efficiency and construction quality. The present invention combines the advantages of cast-in-place concrete beams and prefabricated construction to achieve the construction goals of convenient connection, reliable stress, improved work efficiency and reduced costs.

Contents of the invention

In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a prefabricated steel frame-cast-in-place concrete beam and a construction method thereof to solve the problems of low connection quality, low installation efficiency and construction problems of prefabricated concrete structures in the prior art. Difficult technical issues.

In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve:

A prefabricated steel frame-cast-in-situ concrete beam, including a formed steel frame. The formed steel frame includes two groups of longitudinal steel bars distributed symmetrically up and down. A plurality of longitudinal steel bars are provided on the entire exterior of the two groups of longitudinal steel bars along the longitudinal direction. stirrups; the ends of adjacent longitudinal bars within each group are located at different positions along the axis;

Both ends of each longitudinal steel bar are prefabricated with extended connecting wire heads and standard connecting wire heads; the extended connecting wire heads are sequentially provided with sleeve lock nut fasteners and straight thread sleeves;

The axial length of the extended connecting thread head is the sum of the axial length of the straight thread sleeve and the axial length of the sleeve lock nut fastener; the axial length of the standard connecting thread head is 0.5 times The sum of the axial length of the straight thread sleeve and the axial length of the sleeve lock nut fastener;

It also includes a formwork box, the formwork box includes a beam bottom formwork, and a pair of longitudinal beam side formwork and a pair of transverse beam side formwork vertically arranged on the beam bottom formwork;

The formed steel frame is located in the formwork box, there is a gap between the inner wall of the formwork box and the formed steel frame, and the formwork box is filled with concrete.

The invention also includes the following technical features:

The distance on the axis between the end faces of the extended connecting wires or standard connecting wires on adjacent longitudinal steel bars shall not be less than 35 times the diameter of the longitudinal steel bars and shall not be less than 500 mm.

The longitudinal steel bars and stirrups are fixed by binding or welding.

The longitudinal beam side formwork and the transverse beam side formwork, the longitudinal beam side formwork and the beam bottom formwork, and the transverse beam side formwork and the beam bottom formwork are all fixed using pins and pins.

It also includes protective caps, which are respectively provided at the ends of the extended connecting wire head and the standard connecting wire head.

A method of constructing a prefabricated steel frame-cast-in-situ concrete beam, which specifically includes the following steps:

Step 1: Prefabricate extended connecting wire heads and standard connecting wire heads at both ends of the longitudinal steel bars;

Step 2: Stack the longitudinal steel bars according to the diameter of the steel bar, the cutting length of the steel bar and the type of wire ends, and put protective caps on the ends of the extended connecting wire heads and standard connecting wire heads;

Step 3: Fix the longitudinal steel bars and stirrups to obtain the formed beam steel frame;

Step 4: Transport the formed beam steel frame to the construction site, remove the protective cap, and check whether the thread form of the rolling thread on the extended connecting screw head and the standard connecting screw head is full and complete, and whether there are broken teeth or damage;

Step 5: Screw the sleeve lock nut fastener onto the extended connecting thread head; there is a gap of one or two wires between the sleeve lock nut fastener and the end face of the longitudinal steel bar;

Step 6: Hoist the formed beam steel frame to the reserved connection position, set the temporary support and positioning structure of the formed beam steel frame according to the preset horizontal elevation and control axis, center and fix the formed beam steel frame, so that the longitudinal steel bars The end faces of the extended connecting wire head and the standard connecting wire head are tightened with the reserved joint axis at the column end or beam column end on site;

Step 7: Use a vernier caliper to check the outer diameter of the straight threaded sleeve in no less than two directions, and use the straight threaded sleeve to quickly assemble the steel frame and reserved joints;

Step 8: Reserve the thickness of the concrete protective layer according to the on-site construction requirements and the position of the straight thread sleeve, erect the beam bottom formwork, longitudinal beam side formwork and transverse beam side formwork, and use pins and pins to fix them;

Step 9: Concrete is poured on-site. After the concrete is cured, the formwork box is removed to obtain a prefabricated steel frame-cast-in-place concrete beam.

In step 7, the use of a straight threaded sleeve to quickly assemble the beam steel frame and reserved joints is specifically: rotating the straight threaded sleeve on the extended connecting screw head so that one end thereof is rotated to the standard connecting screw head of the reserved joint. of the sleeve lock nut fastener, and tighten the sleeve lock nut fastener of the extended connecting thread head to the other end of the straight thread sleeve; use a vernier caliper to measure the sleeve lock nut fastener of the extended connecting thread head The distance between the end face and the longitudinal steel bar, judge whether the distance is half the length of the straight thread sleeve, if so, the connection is completed, otherwise continue to adjust until the end face of the sleeve lock nut fastener on the lengthened connection thread head is in line with the length of the straight thread sleeve. The distance between longitudinal bars is half the length of the straight threaded sleeve.

Compared with the existing technology, the beneficial technical effects of the present invention are:

(Ⅰ) The longitudinal steel bars in the present invention are connected with straight threaded sleeves, which facilitates on-site construction personnel to quickly install the steel bar skeleton and perform quality inspection, greatly improves the on-site construction efficiency, and at the same time ensures the construction quality of the concrete beams and solves the problem The existing technical problems of prefabricated concrete structures include low connection quality and high construction difficulty.

(II) The present invention applies the prefabricated steel skeleton-cast-in-situ concrete construction mode to reinforced concrete beam components, which solves the production problems in traditional construction such as heavy workload of on-site steel bar forming, high labor demand, low construction efficiency and harsh construction environment. .

Description of drawings

Figure 1 is a schematic structural diagram of the formed steel frame of the present invention;

Figure 2 is a schematic diagram of the assembly structure of the formed steel frame and reserved joints of the present invention;

Figure 3 is a schematic diagram of the assembly structure of the formed steel frame and formwork box in the present invention;

Figure 4 is a schematic diagram of the specific assembly structure of the longitudinal steel bars and reserved joints in the present invention;

Figure 5 is a schematic structural diagram of the longitudinal steel bars and reserved joints in Figure 4 after assembly;

Figure 6 is a schematic diagram of longitudinal steel bars during transportation;

Figure 7 is a schematic diagram of the prefabricated steel frame-cast-in-situ concrete beam after construction of the present invention.

The meaning of each number in the figure is: 1-formed steel frame, 2-formwork box, 3-protective cap, 4-beam column, 5-reserved joint;

101-Longitudinal steel bars, 102-Stirrups, 104-Extended connecting wire head, 105-Standard connecting wire head, 106-Sleeve lock nut fastener, 107-Straight threaded sleeve;

201-beam bottom formwork, 202-longitudinal beam side formwork, 203-transverse beam side formwork.

The specific content of the present invention will be further explained in detail below with reference to the examples.

Detailed ways

It should be noted that all components in the present invention are components known in the art unless otherwise specified.

Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent transformations based on the technical solution of this application fall within the protection scope of the present invention.

The invention provides an assembled steel frame-cast-in-situ concrete beam, as shown in Figures 1 to 6, including a formed steel frame 1. The formed steel frame 1 includes two groups of longitudinal steel bars 101 distributed symmetrically up and down. A plurality of stirrups 102 are arranged longitudinally on the entire outside of the steel bar 101; the ends of adjacent longitudinal steel bars 101 in each group are located at different positions in the axial direction;

The two ends of each longitudinal steel bar 101 are respectively prefabricated with extended connecting wire heads 104 and standard connecting wire heads 105; the extended connecting wire heads 104 are sequentially provided with sleeve lock nut fasteners 106 and straight thread sleeves 107;

The axial length of the extended connecting thread head 104 is the sum of the axial length of the straight thread sleeve 107 and the axial length of the sleeve lock nut fastener 106; the axial length of the standard connecting thread head 105 is 0.5 times the straight thread The sum of the axial length of the sleeve 107 and the axial length of the sleeve lock nut fastener 106;

It also includes a formwork box 2, which includes a beam bottom formwork 201, and a pair of longitudinal beam side formwork 202 and a pair of transverse beam side formwork 203 vertically arranged on the beam bottom formwork 201;

The formed steel frame 1 is located in the formwork box 2. There is a gap between the inner wall of the formwork box 2 and the formed steel frame 1. The formwork box 2 is filled with concrete.

In the above technical solution, the longitudinal steel bars are connected with straight threaded sleeves, which provides convenience for on-site construction personnel to quickly install the steel skeleton and conduct quality inspection, greatly improves the efficiency of on-site construction, while ensuring the construction quality of concrete beams and solving the existing problems. The technical problems in technology include low connection quality and high construction difficulty of prefabricated concrete structures.

In addition, the prefabricated steel skeleton-cast-in-situ concrete construction mode is applied to reinforced concrete beam components, which solves the production problems in traditional construction such as heavy on-site steel bone forming workload, high labor demand, low construction efficiency, and harsh construction environment.

Specifically, the distance on the axis between the end faces of the extended connecting wire heads 104 or the standard connecting wire heads 105 on adjacent longitudinal steel bars 101 is not less than 35 times the diameter of the longitudinal steel bars 101 and is not less than 500 mm.

Specifically, the longitudinal steel bars 101 and the stirrups 102 are tied or welded to ensure the stability of the formed steel frame 1.

Specifically, pins and pins are used between the longitudinal beam side formwork 202 and the transverse beam side formwork 203, between the longitudinal beam side formwork 202 and the beam bottom formwork 201, and between the transverse beam side formwork 203 and the beam bottom formwork 201. Fixed for easy installation and removal.

Specifically, it also includes protective caps 3, which are respectively provided at the ends of the extended connecting wire head 104 and the standard connecting wire head 105. It is used to protect the thread rolling on the extended connecting thread head 104 and the standard connecting thread head 105 from wear during transportation.

The invention also provides a method for constructing an assembled steel frame-cast-in-situ concrete beam, which specifically includes the following steps:

Step 1: Prefabricate extended connecting wire heads 104 and standard connecting wire heads 105 at both ends of the longitudinal steel bar 101;

Step 2: Classify and stack the longitudinal steel bars 101 according to the diameter of the steel bar, the cutting length of the steel bar, and the type of wire ends, and set protective caps 3 on the ends of the extended connecting wire heads 104 and the standard connecting wire heads 105;

Step 3: Fix the longitudinal steel bars 101 and the stirrups 102 to obtain the formed beam steel frame 1;

Step 4: Transport the formed beam steel frame 1 to the construction site, remove the protective cap 3, and check whether the thread shape of the rolling thread on the extended connecting screw head 104 and the standard connecting screw head 105 is full and complete, and whether there are broken teeth or damage. Condition;

Step 5: Screw the sleeve lock nut fastener 106 onto the extended connecting thread head 104; there is a gap of one or two wires between the sleeve lock nut fastener 106 and the end face of the longitudinal steel bar 101;

Step 6: Hoist the formed beam steel frame 1 to the reserved connection position, set the temporary support and positioning structure of the beam steel frame according to the preset horizontal elevation and control axis, center and fix the formed beam steel frame 1, so that the longitudinal steel bars The end faces of the extended connecting wire head 104 and the standard connecting wire head 105 of 101 are tightly pressed against the axis center of the reserved joint 5 at the column end or beam column end at the site;

Step 7: Use a vernier caliper to check the outer diameter of the straight thread sleeve 107 in no less than two directions, and use the straight thread sleeve 107 to quickly assemble the beam steel frame and reserved joints;

Step 8: Reserve the thickness of the concrete protective layer according to the on-site construction requirements and the position of the straight thread sleeve 107, erect the beam bottom formwork 201, the longitudinal beam side formwork 202 and the transverse beam side formwork 203, and use pins and pins to fix them;

Step 9: Concrete is poured on-site. After the concrete is cured, the formwork box is removed to obtain a prefabricated steel frame-cast-in-place concrete beam. See Figure 7.

Specifically, in step 7, the straight thread sleeve 107 is used to quickly assemble the beam steel frame and the reserved joint. Specifically, the straight thread sleeve 107 on the extended connecting wire head 101 is rotated to rotate one end to the standard of the reserved joint 5. Connect the sleeve lock nut fastener 106 on the wire head 105, and tighten the sleeve lock nut fastener 106 of the extended connection wire head 104 to the other end of the straight thread sleeve 107; use a vernier caliper to measure the lengthened connection wire head The distance between the end face of the sleeve lock nut fastener 106 on the 104 and the longitudinal steel bar 101, determine whether the distance is half the length of the straight thread sleeve 107, if so, the connection is completed, otherwise continue to adjust until the connecting wire is lengthened. The distance between the end face of the sleeve lock nut fastener 106 on the head 104 and the longitudinal steel bar 101 is half the length of the straight threaded sleeve 107.

Claims (7)

1. A prefabricated steel frame-cast-in-situ concrete beam, including a formed steel frame (1), characterized in that the formed steel frame (1) includes two groups of longitudinal steel bars (101) symmetrically distributed up and down, and two groups A plurality of stirrups (102) are arranged longitudinally on the entire exterior of the longitudinal steel bars (101); the ends of adjacent longitudinal steel bars (101) in each group are located at different positions in the axial direction; Both ends of each longitudinal steel bar (101) are prefabricated with extended connecting thread heads (104) and standard connecting thread heads (105); the lengthened connecting thread heads (104) are sequentially provided with sleeve lock nuts. Fasteners (106) and straight thread sleeves (107); The axial length of the extended connecting wire head (104) is the sum of the axial length of the straight thread sleeve (107) and the axial length of the sleeve lock nut fastener (106); the standard connecting wire The axial length of the head (105) is 0.5 times the sum of the axial length of the straight thread sleeve (107) and the axial length of the sleeve lock nut fastener (106); It also includes a formwork box (2). The formwork box (2) includes a beam bottom formwork (201), and a pair of longitudinal beam side formworks (202) and a pair of transverse beams that are vertically arranged on the beam bottom formwork (201). side template(203); The formed steel frame (1) is located in the formwork box (2), and there is a gap between the inner wall of the formwork box (2) and the formed steel frame (1). The formwork box (2) ) is filled with concrete. 2. The assembled steel frame-cast-in-situ concrete beam according to claim 1, characterized in that the adjacent longitudinal steel bars (101) have extended connecting threads (104) or standard connecting threads (105). The distance between the end faces on the axis shall not be less than 35 times the diameter of the longitudinal steel bar (101) and shall not be less than 500mm. 3. The assembled steel frame-cast-in-situ concrete beam according to claim 1, characterized in that the longitudinal steel bars (101) and stirrups (102) are fixed by binding or welding. 4. The assembled steel frame-cast-in-situ concrete beam according to claim 1, characterized in that, between the longitudinal beam side formwork (202) and the transverse beam side formwork (203), the longitudinal beam side formwork (202 ) and the beam bottom formwork (201) and between the transverse beam side formwork (203) and the beam bottom formwork (201) are fixed using pins and pins. 5. The assembled steel frame-cast-in-situ concrete beam according to claim 1, characterized in that it also includes protective caps (3), and the protective caps (3) are respectively arranged on the extended connecting wire heads ( 104) and the end of the standard connecting wire head (105). 6. A method for constructing a prefabricated steel frame-cast-in-situ concrete beam, which is characterized in that it is used to construct a prefabricated steel-bar skeleton-cast-in-place concrete beam as claimed in any one of claims 1 to 5, specifically including the following steps : Step 1: Prefabricate extended connecting wire heads (104) and standard connecting wire heads (105) at both ends of the longitudinal steel bar (101); Step 2: Stack the longitudinal steel bars (101) according to the diameter of the steel bar, the cutting length of the steel bar and the type of wire ends, and set protective caps (3) on the ends of the extended connecting wire heads (104) and the standard connecting wire heads (105) ); Step 3: Fix the longitudinal steel bars (101) and stirrups (102) to obtain the formed beam steel frame (1); Step 4: Transport the formed beam steel frame (1) to the construction site, remove the protective cap (3), and check whether the thread form of the rolling thread on the extended connecting screw head (104) and standard connecting screw head (105) is full. , complete and whether there are broken teeth or damage; Step 5: Screw the sleeve lock nut fastener (106) to the extended connecting thread head (104); the connection between the sleeve lock nut fastener (106) and the end surface of the longitudinal steel bar (101) There is a gap of one or two wires; Step 6: Hoist the formed beam steel frame (1) to the reserved connection position, set the temporary support and positioning structure of the beam steel frame according to the preset horizontal elevation and control axis, center and fix the formed beam steel frame (1) , so that the end faces of the extended connecting threads (104) and standard connecting threads (105) of the longitudinal steel bars (101) are tightly pressed against the axis of the reserved joints (5) at the end of the column or the end of the beam (4) on site; Step 7: Use a vernier caliper to check the outer diameter of the straight threaded sleeve (107) in no less than two directions, and use the straight threaded sleeve (107) to quickly assemble the beam steel frame and reserved joints; Step 8: Reserve the thickness of the concrete protective layer according to the on-site construction requirements and the position of the straight thread sleeve (107), erect the beam bottom formwork (201), longitudinal beam side formwork (202) and transverse beam side formwork (203), and use Pins and pins hold it in place; Step 9: Concrete is poured on-site. After the concrete is cured, the formwork box is removed to obtain a prefabricated steel frame-cast-in-place concrete beam. 7. The construction method of assembled steel frame-cast-in-place concrete beam according to claim 6, characterized in that in step 7, the straight thread sleeve (107) is used to quickly assemble the beam steel frame and reserved joints. Specifically: rotate the straight threaded sleeve (107) on the extended connecting screw head (101) so that one end rotates to the sleeve lock nut fastener (105) on the standard connecting screw head (105) of the reserved joint (5) 106), and tighten the sleeve lock nut fastener (106) of the extended connecting wire head (104) to the other end of the straight thread sleeve (107); use a vernier caliper to measure the sleeve lock nut on the extended connecting wire head (104) Check the distance between the end face of the cylinder lock nut fastener (106) and the longitudinal steel bar (101). Determine whether the distance is half the length of the straight thread sleeve (107). If so, the connection is completed. Otherwise, continue to adjust until it is lengthened. The distance between the end surface of the sleeve lock nut fastener (106) on the connecting thread head (104) and the longitudinal steel bar (101) is half the length of the straight thread sleeve (107).