CN113279423B - Prefabricated column pier and post-cast strip foundation beam assembly integral construction method - Google Patents

Abstract

The invention discloses an integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam, comprising a prefabricated column pier and a post-cast strip foundation beam. The first joint steel bar of the force steel bar, the side of the prefabricated column pier extends out the second joint steel bar and the third joint steel bar used to connect the longitudinal stress steel bar of the post-cast strip-shaped foundation beam rib beam and the wing plate distribution steel bar; The prefabricated column piers are placed at the predetermined column positions, and the extension of the first steel bar joint and the construction of the frame structure of the first structural layer are carried out, and the second joint steel bar and the third joint steel bar of the prefabricated column pier are timely and synchronously carried out during the construction of the upper structure. After the extension and pouring of concrete is completed, the strip-shaped foundation beam is poured and the structure is further extended upward; the present invention forms a cross-stripe foundation with relatively large spatial rigidity by post-casting the strip-shaped foundation beam and bears the self-weight and construction load of the structure extending upward continuously, thereby To achieve the purpose of saving time.

Description

Integral construction method for prefabricated column pier and post-cast strip foundation beam assembly

technical field

The invention relates to the field of building construction, and is particularly suitable for an integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam for a basement without an attached building.

Background technique

The strip foundation under the column refers to the reinforced concrete strip foundation arranged in one or two directions, also known as the beam foundation or the foundation beam. Its cross section is composed of a rib beam and laterally protruding wings. Because the height of the rib beam is relatively large, a certain number of longitudinal stress steel bars and stirrups are arranged, and the lateral bending steel bars and the wing plate distribution steel bars are arranged at the bottom of the wing plate, so it has greater shear, bending and anti-corrosion resistance. Punching capacity, so it is often used in situations where the load is large and the bearing capacity of the foundation is small, such as a frame or bent structure on a weak foundation. The strip foundation under the column has many advantages, such as high rigidity and strong ability to adjust uneven settlement.

For high-rise buildings with large loads, the foundation is weak, the compression uniformity of the foundation soil is poor, or the column load is very different in the vertical and horizontal directions, so the strip foundation needs to have certain resistance in the vertical and horizontal directions In order to reduce the deformation of the foundation and avoid excessive uneven settlement, it is usually set as a crisscross strip foundation of reinforced concrete beams in both the longitudinal and transverse directions. As a space bearing structure, the overall stiffness of the crisscross strip foundation is relatively large, which can effectively reduce the settlement difference between the column foundations and meet the requirements of the bearing capacity of the foundation and the deformation of the foundation, thereby ensuring the reliability of the building.

In order to ensure the reliability of the foundation engineering and the superstructure, at present, except for some pile foundations (including prefabricated wood piles, steel pipe piles, prefabricated concrete pipe piles and prefabricated concrete square piles, etc.) In addition to being transported to the construction site for construction, most of the reinforced concrete foundations are reinforced with reinforcement and cast-in-place concrete construction at the construction site. The construction of the superstructure can only be carried out after the strength of the foundation concrete reaches the predetermined strength. Due to the construction of the reinforced concrete foundation project And the maintenance time is long, so it is not conducive to the purpose of shortening the construction period.

In view of the fact that the cast-in-place reinforced concrete foundation (especially the strip foundation) commonly used in foreign countries has the following shortcomings: ① The construction of the reinforced concrete foundation on the construction site requires a long time of maintenance, which is not conducive to shortening the construction period. Immediately bear the self-weight and construction load of the building structure that continues to extend upward, so it cannot be operated in parallel with the construction of the superstructure; ② The construction of the on-site foundation project requires more formwork and a large number of construction personnel, which is not conducive to the realization of rapid installation of building industrialization; ③ The construction of the foundation project is carried out in the open air, which is greatly affected by the weather and the natural environment, and the construction period is easily extended due to weather reasons; for example, the bar foundation under the column with the publication number CN210946872U and a method for local reinforcement of the bar foundation with the publication number CN110080264A All of the above problems exist. In order to solve the above problems, the present invention provides an integrated construction method for the assembly of prefabricated column piers and post-cast strip foundation beams, so as to solve the problem of slow construction progress and long construction period.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a prefabricated column pier and post-cast strip foundation beam assembly integral construction method to achieve the purpose of saving construction period and speeding up construction progress.

For achieving the above object, the present invention provides the following scheme:

An integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam, comprising a prefabricated column pier and a post-cast strip foundation beam, which together form a cross strip foundation beam:

The top of the prefabricated column pier extends upwards with the first joint reinforcement for connecting the longitudinal reinforcement of the upper structure frame column, and the side of the prefabricated column pier extends out for connecting the longitudinal reinforcement reinforcement of the post-cast strip foundation beam rib beam with the longitudinal reinforcement reinforcement. The second joint reinforcement and the third joint reinforcement of the wing plate distribution reinforcement;

The prefabricated column pier is placed at the predetermined column position; the connection between the frame column reinforcement of the first structural layer and the first reinforcement joint of the prefabricated column pier is performed, and the concrete is poured to form the first structural layer frame. During the layer construction, the post-cast strip foundation beams, the longitudinal stress reinforcement of the rib beam, and the wing plate distribution reinforcement are connected to the second joint reinforcement and the third joint reinforcement respectively, and the post-cast strip foundation beams are connected independently by pouring and tamping the concrete. The prefabricated column piers form a cross-strip foundation with high spatial rigidity, and the contact area between the foundation and the foundation is increased by post-casting strip foundation beams to bear the self-weight and construction load of the structure extending upwards until the construction of the entire building is completed. .

Preferably, before placing the prefabricated piers, excavate a foundation pit or a foundation groove and set up a concrete cushion, and place the prefabricated piers on the concrete cushion at a predetermined column position.

Preferably, the prefabricated pier includes a bearing portion and a connecting portion installed in the circumferential direction of the bearing portion, the first joint steel bar extends upward from the top of the bearing portion, and the connecting portion is away from one end of the bearing portion The second and third joint reinforcing bars are extended.

Preferably, the shape of the prefabricated pier is a short cross cylinder, and its bottom area should meet the requirements of the structural self-weight and construction load of the first structural layer to the third structural layer on the bearing capacity and deformation control of the foundation.

Preferably, the connecting part is provided with a rough surface away from the end face of the bearing part, and the area of the rough surface is not less than 80% of the area of the joint surface between the prefabricated pier and the post-cast strip foundation beam.

Preferably, the connecting portion is provided with a groove away from the end face of the bearing portion, and the groove transversely penetrates the end face of the connecting portion.

Preferably, the depth of the groove is not less than 30 mm, and the width is not less than 3 times the depth of the groove and not more than 10 times the depth of the groove.

Preferably, a lifting ring for hoisting is installed on the prefabricated pier.

Preferably, the post-casting strip-shaped foundation beam includes two parts: a rib beam and a wing plate, the rib beam is arranged in the middle of the wing plate and keeps the rib beam and the end of the wing plate on the same end surface, the The end face of the wing plate and the end face of the rib beam form an inverted T-shaped cross section and constitute the connecting portion.

Preferably, the post-cast strip-shaped foundation beam rib-beam longitudinal stress reinforcement and the wing plate distribution reinforcement are respectively connected with the second joint reinforcement and the third joint reinforcement by mechanical or welding methods, and the post-cast strip foundation The stirrups of the beam rib beam are provided with densified areas at positions close to the second joint reinforcement and the third joint reinforcement.

The present invention has achieved the following technical effects with respect to the prior art:

1. The present invention makes the prefabricated column piers bear the self-weight and construction load of the upper building low-rise structure (the first structural layer to the third structural layer) by placing the prefabricated column piers in advance, and at the same time, it is timely during the construction of the upper building low-rise structure frame. Simultaneously carry out the construction of the post-cast strip foundation beams, so as to save the construction period and avoid the construction of the first structural layer frame columns only after the strip foundation beam construction is completed in the previous strip foundation construction. When the strength of the strip foundation reaches the standard, the construction period is delayed and the construction progress is affected.

2. The present invention excavates foundation pits or foundation trenches and sets up a concrete cushion before placing the prefabricated piers, and places the prefabricated piers on the concrete cushions at predetermined column positions. The setting of the concrete cushions ensures that all prefabricated The column pier is in a stable horizontal state after being placed, and the elevation of the top and bottom surfaces of the prefabricated column pier is the same as that of the post-cast strip foundation beam.

3. In the present invention, the prefabricated pier includes a bearing portion and a connecting portion installed in the circumferential direction of the bearing portion. The top of the bearing portion extends upward with a first joint steel bar, and the end of the connecting portion away from the bearing portion extends out a second joint steel bar and a first joint steel bar. The three-joint steel bars, that is, the connection between the upper frame structure column, the post-cast strip foundation beam and the prefabricated column pier are all connected by reinforced concrete, which enhances the connection strength and rigidity between each other, and further strengthens the overall strength and strength of the cross strip foundation beam structure. stiffness.

4. The prefabricated pier of the present invention is provided with a hoisting ring for hoisting, which facilitates the transport and placement of the prefabricated pier.

Description of drawings

In order to more clearly illustrate the present invention or the technical solutions in the prior art, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

Accompanying drawing 1 is the structural schematic diagram of prefabricated pier;

Accompanying drawing 2 is the structural schematic diagram of prefabricated column pier groove;

Accompanying drawing 3 is the schematic diagram of post-casting strip foundation beam reinforcement cage;

Accompanying drawing 4 is the parallel operation schematic diagram of prefabricated column pier and post-cast strip foundation beam and superstructure;

Accompanying drawing 5 is the schematic diagram of post-cast strip foundation beam

Among them, 1. prefabricated column pier; 2. bearing part; 201, first joint steel bar; 3. connecting part; 301, second joint steel bar; 302, third joint steel bar; 303, groove; 4, post-cast bar Reinforcement cage of foundation beam; 401. Longitudinal stress reinforcement of post-cast strip-shaped base beam rib beam; 402. Post-cast strip-shaped base beam wing plate distribution reinforcement; 403. Post-cast strip-shaped base beam and wing plate transverse bending reinforcement; 404, Post-cast strip foundation beam rib beam stirrup; 5. Post-cast strip base beam; 501. Post-cast strip base beam rib beam; 502. Post-cast strip base beam wing plate; 6. Frame column on the first structural layer 7. Beams and slabs of the first structural layer;

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The purpose of the present invention is to provide an integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam, so as to achieve the purpose of saving the construction period and speeding up the construction progress.

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Please refer to Figures 1 to 4, an overall construction method for assembling a prefabricated column pier and a post-cast strip foundation beam, including the following contents: a prefabricated column pier 1 and a post-cast strip foundation beam 5, which together form a cross strip foundation beam , the top of the prefabricated column pier 1 extends upwards with a first joint reinforcement bar 201 for connecting the longitudinal stress reinforcement of the upper structure frame column, and the side of the prefabricated column pier 1 extends out for connecting the post-cast strip-shaped foundation beam reinforcement cage 4 The second joint reinforcing bar 301 and the third joint reinforcing bar 302; the prefabricated column pier 1 is placed in the predetermined column position; The construction of the structural layer frame, and then the post-cast strip-shaped foundation beam reinforcement cage 4 rib beam longitudinal stress reinforcement 401 is connected with the second joint reinforcement 301 during the construction of the first structural layer to the third structural layer in a timely manner, and the wing plate distributes the reinforcement. The connection between 402 and the third joint reinforcement bar 302 is to bind the lateral bending reinforcement bars 403 of the wing plate under the wing plate distribution reinforcement bar 402 of the post-cast strip-shaped base beam reinforcement cage 4 and set the stirrups 404 for the rib beam, and the post-cast strip-shaped base beam 5 concrete, so as to complete the construction of the post-cast strip foundation beam 5 under the column; the present invention, by placing the prefabricated column pier 1 in advance, the prefabricated column pier 1 bears the structure of the upper building low-level (the first structural layer to the third structural layer) structure Simultaneously post-cast the strip foundation beam 5 and complete the continuous extension construction of the upper structure at the same time as the self-weight and the construction load, so as to achieve the purpose of saving the construction period and avoid the previous strip foundation construction that can only be completed after the construction of the strip foundation. The construction of the frame column 6 of the first structural layer can be carried out. In the process of waiting for the strength of the strip foundation to reach the standard, the construction period is delayed and the construction progress is affected; At the same time as the construction of the low-rise structure (the first structural layer to the third structural layer), the post-casting strip foundation beam 5 is carried out in a timely manner, and the construction of the upper structure of the building such as the floor slab and the frame column is carried out at the same time, so that the construction of the building is further accelerated. The construction progress has an important impact on the construction progress of the entire building structure.

Further, before placing the prefabricated column pier 1, excavate a foundation pit or a foundation groove and set a concrete cushion, and place the prefabricated column pier 1 on the concrete cushion at a predetermined column position. The setting of the concrete cushion ensures that all The prefabricated column pier 1 is in a stable horizontal state after being placed, and the elevation of the top and bottom surfaces of the prefabricated column pier 1 and the top and bottom surfaces of the post-cast strip foundation beam are at the same elevation.

Referring to FIG. 1 , the prefabricated pier 1 includes a bearing portion 2 and a connecting portion 3 installed in the circumferential direction of the bearing portion 2 . The top of the bearing portion 2 extends upward with a first joint reinforcement bar 201 , and the connecting portion 3 extends away from one end of the bearing portion 2 . The second joint reinforcement bar 301 and the third joint reinforcement bar 302 are obtained, that is, the connection between the frame column 6 of the first structural layer and the prefabricated column pier 1 and the connection between the post-cast strip foundation beam 5 and the prefabricated column pier 1 are all reinforced concrete connections. The connection strength and rigidity between each other are enhanced, and the overall strength and rigidity of the post-cast cross-strip foundation beam 5 structure are further strengthened.

Further, the shape of the prefabricated column and pier is a short cross column, which satisfies the construction habit of the conventional strip foundation beams crossing horizontally and vertically at 90°, and the choice of formwork is universal. The central part of the top of the column prefabricated column pier 1, therefore, the four short arms of the short cross prefabricated column pier 1 have a dispersing effect on the self-weight and construction load of the low-rise frame structure (the first structural layer to the third structural layer), thereby improving the efficiency of the construction. The bearing capacity of the prefabricated column pier 1 can satisfy the deformation control; further, the overall shape of the prefabricated column pier 1 can also be a cube, a cuboid, a cylinder or a truncated cone.

Further, the end of the connecting part 3 away from the bearing part 2 is provided with a rough surface, and the area of the rough surface is not less than 80% of the combined area of the prefabricated column pier 1 and the post-cast strip foundation beam 5, so as to increase the connection part 3 and the post-cast strip. The connection strength and force transmission effect of the shaped foundation beam 5.

Referring to FIG. 2 , a groove 303 is provided on the end face of the connecting portion 3 away from the bearing portion 2, and the groove 303 penetrates the end face of the bearing portion 2 transversely. The groove 303 on the pier 1 is connected, and the concrete entering the strip foundation beam 5 in the groove 303 is conducive to the reliable force transmission of the vertical load of the prefabricated column pier 1 and the backward pouring of the strip foundation beam 5, and at the same time To achieve the purpose of enhancing the strength of the connection with each other.

Further, the depth of the groove 303 is not less than 30mm, and the width is not less than 3 times the depth of the groove 303 and not more than 10 times the depth of the groove 303, so as to achieve the optimal performance between the strip foundation beam 5 and the prefabricated pier 1. connection effect.

Further, the prefabricated column pier 1 is provided with a hoisting ring for hoisting, which facilitates the placement, movement and transportation of the prefabricated column pier 1 .

5, the strip-shaped base beam 5 includes a rib beam 501 and a wing plate 502. The rib beam 501 is arranged in the middle of the wing plate 502 and keeps the end of the rib beam 501 and the wing plate 502 in the same section, and the end of the wing plate 502 and the rib plate 502 are in the same section. The end of the beam 501 forms an inverted T-shaped section and is connected with the connecting part 3, and the inverted T-shaped end will form a stable structural foundation. The purpose of bearing capacity and deformation control.

Further, the longitudinal stress bar 401 of the rib beam in the post-cast strip-shaped foundation beam reinforcement cage 4 is connected with the second joint reinforcement bar 301, and the wing plate distribution reinforcement bar 402 of the post-cast strip-shaped base beam reinforcement cage 4 is connected with the third joint reinforcement bar 302 Connection, the connection method can be mechanical connection or welding, and the lateral bending steel bars 403 of the wing plates are bound under the wing plate distribution steel bars 402 of the post-cast strip foundation beam reinforcement cage 4, and stirrups 404 are set for the longitudinal stress steel bars 401 of the rib beams. The post-cast strip-shaped foundation beam reinforcement cage 4 rib beam stirrups 404 are provided with densified areas near the second joint reinforcement bar 301 and the third joint reinforcement bar 302 . At the same time, the setting of the densification area strengthens the connection strength and rigidity of the post-cast strip foundation beam 5 and the prefabricated column pier 1 .

Adaptive changes made according to actual needs are all within the protection scope of the present invention.

It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. . Therefore, the embodiments are to be regarded in all respects as illustrative and not restrictive, and the scope of the invention is to be defined by the appended claims rather than the foregoing description, which are therefore intended to fall within the scope of the claims. All changes within the meaning and scope of the equivalents of , are included in the invention. Any reference signs in the claims shall not be construed as limiting the involved claim.

Claims (10)

1. a prefabricated column pier and a post-cast strip foundation beam assembly integral construction method, it is characterized in that, comprise prefabricated column pier and post-cast strip foundation beam, the two together constitute a cross strip foundation beam; The top of the prefabricated column pier extends upwards with the first joint reinforcement for connecting the longitudinal reinforcement of the upper frame structure column, and the side of the prefabricated column pier extends out for connecting the longitudinal reinforcement reinforcement of the post-cast strip foundation beam, rib beam and the longitudinal reinforcement. The second joint reinforcement and the third joint reinforcement of the wing plate distribution reinforcement; Place the prefabricated piers at the predetermined column positions; connect the longitudinal stressed steel bars of the frame columns of the first structural layer and the first steel bar joints of the prefabricated piers, and pour concrete to form the first structural layer frame, and the first structural layer to the first structural layer. During the construction of the third structural layer, the post-cast strip foundation beam, rib beam, longitudinal stress reinforcement and wing plate distribution reinforcement, and the prefabricated column and pier second and third joint reinforcements are connected in a timely manner, and the concrete is poured to form a post-cast strip. The foundation beam connects the independent prefabricated columns and piers to form a cross-strip foundation with greater spatial rigidity. The contact area between the foundation and the foundation is increased by post-casting the strip foundation beam to bear the self-weight of the structure and the construction load that extends upwards until the completion of the whole structure. construction of a building. 2. A prefabricated column pier and post-cast strip-shaped foundation beam assembly integral construction method according to claim 1, characterized in that, before the prefabricated column pier is placed, a foundation pit or a foundation groove is excavated and a concrete cushion is arranged , and place the prefabricated column pier on the concrete cushion at a predetermined column position. 3. An integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam according to claim 1 or 2, wherein the prefabricated column pier comprises a bearing portion and a connection installed around the bearing portion The first joint reinforcing bar extends from the top of the bearing portion, and the second joint reinforcing bar and the third joint reinforcing bar extend around the connecting portion. 4. The overall construction method for assembling a prefabricated column pier and a post-cast strip foundation beam according to claim 3, wherein the prefabricated column pier has a short cross cylinder shape, and its bottom area should meet the requirements of the first Requirements for the bearing capacity and deformation control of the foundation from the structural self-weight and construction load from the structural layer to the third structural layer. 5. An integral construction method for assembling a prefabricated column pier and a post-cast strip-shaped foundation beam according to claim 3, wherein a rough surface is set at the joint surface of the connecting part and the post-cast strip-shaped base beam, so the The area of the rough surface is not less than 80% of the area of the joint surface with the post-cast strip-shaped foundation beam. 6 . An integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam according to claim 4 , wherein a groove is arranged on the end face of the connecting portion, and the groove transversely penetrates the connecting portion. 7 . end face. 7. The overall construction method for prefabricated column pier and post-cast strip foundation beam assembly according to claim 6, wherein the depth of the groove is not less than 30mm, and the width is not less than 3 times the depth of the groove. times not more than 10 times the depth of the groove. 8 . An integral construction method for assembling a prefabricated column pier and a post-cast strip foundation beam according to claim 3 , wherein the prefabricated column pier is provided with a lifting ring for transportation and hoisting. 9 . 9 . An integral construction method for assembling a prefabricated column pier and a post-cast strip-shaped base beam according to claim 4 , wherein the cross-section of the post-cast strip-shaped base beam comprises a rib beam and a wing plate, and the wing plate is connected to a rib beam. The rib beam forms an inverted T-shaped section and is connected with the connecting portion. 10. A prefabricated column pier and post-cast strip-shaped foundation beam assembly integral construction method according to claim 9, characterized in that, the strip-shaped foundation beam rib beam longitudinal stress reinforcement and the wing plate distribution reinforcement are respectively associated with the The second joint steel bar and the third joint steel bar are connected by mechanical or welding methods, and the post-cast strip-shaped foundation beam rib beam stirrup is provided with an encryption area at a position close to the connecting portion.

Images