CN106948375A - A kind of prefabricated pipe gallery steel plate concrete attachment structure - Google Patents

Abstract

A prefabricated comprehensive pipe gallery steel plate concrete connection structure, the invention relates to the technical field of structural engineering. The invention aims to solve the technical problems of weak anti-seepage performance and low non-uniform settlement resistance performance at the joints of the current prefabricated comprehensive pipe gallery structure, and the rigid connection is prone to brittle fracture at the joints. The connection structure is composed of a prefabricated section, a post-cast section and a steel plate. The post-cast section is set between two adjacent precast sections. The precast section is equipped with steel bars and embedded parts. The embedded parts are embedded in the precast section. The top surface of the embedded part The surface of the prefabricated section is exposed, the steel bars protrude longitudinally from the section of the precast section, the steel bars and embedded parts are fixedly connected inside the precast section, the steel bars protruding longitudinally from two adjacent precast sections are fixedly connected in the post-cast section, and the upper surface of the post-cast section and the lower surface are covered with steel plates. The invention has the advantages of fast construction speed, high reliability, anti-seepage performance at joints, anti-uniform subsidence performance, and strong integrity; the rigid connection is not easy to be brittle. It can be used in prefabricated pipe gallery structure.

Description

A prefabricated comprehensive pipe gallery steel plate concrete connection structure

technical field

The invention relates to the technical field of structural engineering.

Background technique

Today, the utilization of urban underground space has become a key issue in urban development, especially for fast-growing large cities. Due to the development of cities and the development of various public utilities, urban public pipelines are increasing day by day. Now urban public pipelines have been gradually put underground to reduce their damage due to climate, man-made or natural disasters. As an effective form of accommodating public pipelines, the urban comprehensive utility corridor not only makes full use of the underground space, but also avoids the phenomenon of excavation everywhere.

There are two construction methods of cast-in-place and prefabricated underground comprehensive pipe gallery. The prefabricated comprehensive pipe gallery has the advantages of fast construction speed, low construction noise, civilized site, high quality and reliability of pipe gallery, and good impermeability and durability. It is widely used in corridor structure.

However, the prefabricated integrated pipe gallery structure also has disadvantages such as poor structural integrity, many interfaces, and a high probability of interface problems. The joints of prefabricated pipe racks can be divided into rigid joints and flexible joints, but no matter what kind of joints, there are few joint forms that can not only meet the anti-seepage requirements at the joints, but also resist large uneven settlement. There is no misalignment or breakage. For example, the longitudinal prestressed tendon tension connection method, as a rigid connection, uses prestress to connect the segments, but the prestress is to apply pressure to the waterproof rubber ring to meet the sealing requirements, and does not form a preload inside the corridor. Stress, no ability to resist settlement, when the settlement is large, the box may break; another example is the double rubber ring large tongue and groove joint, as a flexible joint, it can adapt to a certain degree of displacement and rotation angle, but when the displacement is large, it will produce Dislocation phenomenon, and the dimensional accuracy of the working surface of this type of joint is required to be high, and the interface production is relatively difficult.

Contents of the invention

The present invention aims to solve the technical problems of weak anti-seepage performance, low anti-uniform settlement performance, and brittle fracture of the rigid connection at the joint of the structural section of the prefabricated comprehensive pipe gallery at present, and provides a steel plate concrete connection for the prefabricated comprehensive pipe gallery structure.

A steel plate concrete connection structure of a prefabricated comprehensive pipe gallery is composed of a prefabricated section, a post-cast section and a steel plate, wherein the post-cast section is arranged between two adjacent precast sections, steel bars and embedded parts are arranged inside the prefabricated section, and the embedded parts are embedded Prefabricated section, and the top surface of the embedded part is exposed on the surface of the precast section, the steel bar extends longitudinally out of the precast section section, the steel bar and the embedded part are fixedly connected inside the precast section, and the longitudinally protruding steel bars of two adjacent precast sections are in the post-casting section Fixed connection, the upper surface and the lower surface of the post-casting section are covered with steel plates, and the two ends of the steel plate are respectively fixedly connected with the embedded parts of two adjacent prefabricated sections.

The prefabricated section needs to pre-embed embedded parts, and the embedded parts are made of special-shaped steel; during prefabrication, the longitudinal steel bars need to protrude from the section, and the protruding length is greater than the length required when the longitudinal steel bars are connected to each other; the end of the prefabricated section section adopts tooth In order to increase the bond between the post-casting section and the concrete of the precast section, if the toothed structure is not used, it is necessary to chisel the end of the section of the precast section.

After the prefabricated section is completed, it needs to be placed in place according to the required position. After the completion of the position, the connection of the longitudinally extending steel bars can be carried out. The connection joints of longitudinally protruding steel bars can be connected by welding or sleeve connection, and the specific requirements must meet the "Code for Design of Concrete Structures" (GB50010-2010), "Regulations for Welding and Acceptance of Reinforcement Bars" (JGJ18-2012) and "Technical Regulations for Mechanical Connection of Reinforcement Bars" ( Relevant requirements of JGJ107-2016).

After the longitudinal reinforcement connection is completed, the steel plate can be connected with the embedded parts, and the external steel plate of the top plate needs to be concreted before being connected. The steel plate and the embedded parts are connected by bolts or welded. The steel plate is made of ordinary steel plate or ribbed steel plate. The steel plate needs special anti-corrosion and derusting treatment to ensure that it meets the requirements of the design service life. The parameters of bolts, welds, steel plates and stiffeners need to be calculated and determined according to factors such as buried depth and soil performance parameters.

After the steel formwork is completed, concrete can be poured. The concrete is impermeable, micro-expansion, early-strength concrete, and its strength grade must not be lower than that of the prefabricated section concrete. After the concrete is finally set, the top steel plate and embedded parts can be connected to form the whole pipe gallery.

The beneficial effects of the present invention are:

1. The steel plate concrete connection structure uses post-cast concrete for the connection section, which makes the integrity of the prefabricated comprehensive pipe gallery better, and there is no gap reserved at the connection. From top to bottom, there are steel plates, concrete, and steel plates, and there are three leak-proof water layers. , making the structure better impermeable;

2. In the steel plate concrete connection structure, the steel plate plays the role of concrete formwork, waterproof layer and stressed steel bar, which makes this connection method not only fast in construction speed and simple in construction method, but also has a high bearing capacity at the connection part and will not Due to uneven settlement of the foundation, brittle fracture or dislocation occurs, and it has better ability to resist settlement;

3. In the steel plate concrete connection structure, since the sections are connected by steel bars and steel plates, compared with some flexible waterproof structures, the processing accuracy requirements for the size of the working face are reduced, and the processing is relatively convenient;

4. In the steel plate concrete connection structure, since the connection is composed of steel and concrete, there is no rubber aging phenomenon caused by using waterproof rubber rings as waterproof measures. Moreover, according to engineering practice, after certain treatment, the concrete and steel plates can meet the requirements of the design service life of 100 years in the "Technical Specifications for Urban Comprehensive Pipe Gallery Engineering" (GB50838-2015).

The prefabricated comprehensive pipe gallery steel plate concrete connection structure of the present invention is used in the construction of urban pipe gallery, especially in the environment where the pipe gallery structure is below the groundwater level or the uneven settlement of the foundation is relatively large.

Description of drawings

Fig. 1 is a schematic diagram of the steel plate concrete connection structure of the prefabricated comprehensive pipe gallery in embodiment 1, wherein 1 is a prefabricated section, 2 is a post-casting section, 3 is a steel bar, 4 is a steel bar connection joint, 5 is a steel plate, and 6 is an embedded part;

Fig. 2 is a schematic diagram of the steel plate concrete connection structure of the prefabricated comprehensive pipe gallery in embodiment 2, wherein 7 is a bolt;

Fig. 3 is a schematic diagram of the steel plate concrete connection structure of the prefabricated comprehensive pipe gallery in embodiment three, wherein 8 is a ribbed steel plate;

Fig. 4 is a schematic diagram of the steel plate concrete connection structure of the prefabricated comprehensive utility gallery in embodiment 4, in which 9 is a toothed structure.

detailed description

The technical solution of the present invention is not limited to the specific embodiments listed below, but also includes any combination of the specific embodiments.

Specific Embodiment 1: In this embodiment, a steel plate concrete connection structure of a prefabricated comprehensive pipe gallery is composed of a prefabricated section 1, a postcast section 2 and a steel plate 5, wherein the postcast section 2 is arranged between two adjacent precast sections 1, and the prefabricated Reinforcement bars 3 and embedded parts 6 are arranged inside section 1, embedded parts 6 are embedded in precast section 1, and the top surface of embedded parts 6 is exposed from the surface of precast section 1, and steel bars 3 protrude longitudinally from the section of precast section 1. Reinforcement bars 3 and embedded parts 6 is fixedly connected inside the prefabricated section 1, and the steel bars 3 protruding longitudinally from two adjacent prefabricated sections 1 are fixedly connected in the post-casting section 2, the upper surface and the lower surface of the post-casting section 2 are covered with steel plates 5, and the two The ends are fixedly connected with the embedded parts 6 of two adjacent prefabricated sections 1 respectively.

Embodiment 2: This embodiment differs from Embodiment 1 in that: the steel bar 3 is fixedly connected to the joint 4 in the post-casting section 2 by welding or sleeve connection. Others are the same as in the first embodiment.

Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the steel plate 5 and the embedded part 6 are fixedly connected by welding or bolts. Others are the same as in the first or second embodiment.

Embodiment 4: This embodiment is different from Embodiment 1 to Embodiment 3 in that: the embedded part 6 is shaped steel. Others are the same as those in the first to third specific embodiments.

Embodiment 5: This embodiment is different from one of Embodiments 1 to 4 in that: the special-shaped steel is π-shaped steel, channel-shaped steel or angle steel. Others are the same as one of the specific embodiments 1 to 4.

Embodiment 6: This embodiment differs from Embodiment 1 to Embodiment 5 in that: the steel plate 5 is a common steel plate or a ribbed steel plate. Others are the same as one of the specific embodiments 1 to 5.

Embodiment 7: This embodiment differs from Embodiment 1 to Embodiment 6 in that: the concrete contact surface of the prefabricated section 1 and the post-cast section 2 is made into a tooth-like structure. Others are the same as one of the specific embodiments 1 to 6.

Embodiment 8: This embodiment is different from Embodiment 1 to Embodiment 7 in that: the concrete contact surface of the prefabricated section 1 and the post-casting section 2 is roughened. Others are the same as one of the specific embodiments 1 to 7.

Embodiment 9: This embodiment is different from Embodiment 1 to Embodiment 8 in that the post-cast section 2 is filled with post-cast concrete. Others are the same as one of the specific embodiments 1 to 8.

Adopt the following examples to verify the beneficial effects of the present invention:

Embodiment one:

In this embodiment, a prefabricated comprehensive pipe gallery steel plate concrete connection structure is composed of a prefabricated section 1, a post-cast section 2 and a steel plate 5, wherein the post-cast section 2 is arranged between two adjacent precast sections 1, and steel bars are arranged inside the precast section 1 3 and embedded part 6, the embedded part 6 is embedded in the precast section 1, and the top surface of the embedded part 6 exposes the surface of the precast section 1, the steel bar 3 extends longitudinally out of the section of the precast section 1, and the steel bar 3 and the embedded part 6 are in the precast section 1 Internal fixed connection, two adjacent prefabricated sections 1 longitudinally protruding steel bars 3 are fixedly connected in the post-casting section 2, the upper surface and lower surface of the post-casting section 2 are covered with steel plates 5, and the two ends of the steel plate 5 are respectively connected with two The embedded parts 6 of adjacent prefabricated sections 1 are fixedly connected.

Wherein the steel bar 3 is fixedly connected in the post-cast section 2 by welding; the fixed connection of the steel plate 5 and the embedded part 6 is welded; the embedded part is π-shaped steel; the steel plate 5 is an ordinary steel plate; the prefabricated section 1 and the The concrete contact surface of the post-casting section 2 shall be chiseled; the post-casting section 2 shall be filled with post-casting concrete.

The schematic diagram of the connection structure of this embodiment is shown in FIG. 1 .

Embodiment two:

In this embodiment, a prefabricated comprehensive pipe gallery steel plate concrete connection structure is composed of a prefabricated section 1, a post-cast section 2 and a steel plate 5, wherein the post-cast section 2 is arranged between two adjacent precast sections 1, and steel bars are arranged inside the precast section 1 3 and embedded part 6, the embedded part 6 is embedded in the precast section 1, and the top surface of the embedded part 6 exposes the surface of the precast section 1, the steel bar 3 extends longitudinally out of the section of the precast section 1, and the steel bar 3 and the embedded part 6 are in the precast section 1 Internal fixed connection, two adjacent prefabricated sections 1 longitudinally protruding steel bars 3 are fixedly connected in the post-casting section 2, the upper surface and lower surface of the post-casting section 2 are covered with steel plates 5, and the two ends of the steel plate 5 are respectively connected with two The embedded parts 6 of adjacent prefabricated sections 1 are fixedly connected.

Wherein the steel bar 3 is fixedly connected in the post-casting section 2 by welding; the fixed connection of the steel plate 5 and the embedded part 6 is bolted; the embedded part is π-shaped steel; the steel plate 5 is an ordinary steel plate; the prefabricated section 1 The concrete contact surface of the post-casting section 2 shall be roughened; the post-casting section 2 shall be filled with post-casting concrete.

The schematic diagram of the connection structure of this embodiment is shown in FIG. 2 .

Embodiment three:

In this embodiment, a prefabricated comprehensive pipe gallery steel plate concrete connection structure is composed of a prefabricated section 1, a post-cast section 2 and a steel plate 5, wherein the post-cast section 2 is arranged between two adjacent precast sections 1, and steel bars are arranged inside the precast section 1 3 and embedded part 6, the embedded part 6 is embedded in the precast section 1, and the top surface of the embedded part 6 exposes the surface of the precast section 1, the steel bar 3 extends longitudinally out of the section of the precast section 1, and the steel bar 3 and the embedded part 6 are in the precast section 1 Internal fixed connection, two adjacent prefabricated sections 1 longitudinally protruding steel bars 3 are fixedly connected in the post-casting section 2, the upper surface and lower surface of the post-casting section 2 are covered with steel plates 5, and the two ends of the steel plate 5 are respectively connected with two The embedded parts 6 of adjacent prefabricated sections 1 are fixedly connected.

Wherein the steel bar 3 is fixedly connected in the post-cast section 2 by welding; the fixed connection of the steel plate 5 and the embedded part 6 is welded; the embedded part is π-shaped steel; the steel plate 5 is a ribbed steel plate; the prefabricated section 1 The concrete contact surface of the post-casting section 2 shall be roughened; the post-casting section 2 shall be filled with post-casting concrete.

The schematic diagram of the connection structure of this embodiment is shown in FIG. 3 .

Embodiment four:

In this embodiment, a prefabricated comprehensive pipe gallery steel plate concrete connection structure is composed of a prefabricated section 1, a post-cast section 2 and a steel plate 5, wherein the post-cast section 2 is arranged between two adjacent precast sections 1, and steel bars are arranged inside the precast section 1 3 and embedded part 6, the embedded part 6 is embedded in the precast section 1, and the top surface of the embedded part 6 exposes the surface of the precast section 1, the steel bar 3 extends longitudinally out of the section of the precast section 1, and the steel bar 3 and the embedded part 6 are in the precast section 1 Internal fixed connection, two adjacent prefabricated sections 1 longitudinally protruding steel bars 3 are fixedly connected in the post-casting section 2, the upper surface and lower surface of the post-casting section 2 are covered with steel plates 5, and the two ends of the steel plate 5 are respectively connected with two The embedded parts 6 of adjacent prefabricated sections 1 are fixedly connected.

Wherein the steel bar 3 is fixedly connected in the post-cast section 2 by welding; the fixed connection of the steel plate 5 and the embedded part 6 is welded; the embedded part is π-shaped steel; the steel plate 5 is a ribbed steel plate; the prefabricated section 1 The contact surface with the concrete of the post-casting section 2 is made into a tooth-like structure; the post-casting section 2 is filled with post-casting concrete.

The schematic diagram of the connection structure of this embodiment is shown in FIG. 4 .

On the one hand, the connection structure of this embodiment retains the advantages of fast construction speed and high quality reliability of the prefabricated structure. On the other hand, it has good impermeability at the connection and anti-uniform settlement of the foundation. The triple effect of the layer and the stress rib makes the connection have a high bearing capacity and will not cause brittle fracture due to poor settlement. The connection structure can be widely used in the segmental connection of the prefabricated comprehensive pipe gallery, and is especially suitable for the environment where the pipe gallery is located below the groundwater level or the foundation condition is poor.

Compared with other prefabricated pipe gallery connection structures, since the connection section is connected by post-cast concrete, its overall performance and impermeability are very good, and there is no difference from the surface of the cast-in-place concrete, while retaining the advantages of the prefabricated method Inheriting the advantages of the cast-in-place method; in addition, due to the existence of steel bars and steel plates, this method has better mechanical performance at the connection, higher bearing capacity, and stronger resistance to uneven settlement of the foundation.

Claims (9)

1. a kind of prefabricated pipe gallery steel plate concrete attachment structure, it is characterised in that the structure by prefabricated section (1), after pour section (2) constituted with steel plate (5), wherein after pour section (2) and be arranged between two contiguous prefabricated section (1), steel is set inside prefabricated section (1) Muscle (3) and built-in fitting (6), built-in fitting (6) are embedded in prefabricated section (1), and built-in fitting (6) top surface exposes prefabricated section of (1) surface, reinforcing bar (3) longitudinally projecting prefabricated section of (1) section, reinforcing bar (3) and built-in fitting (6) are fixedly connected inside prefabricated section (1), and two adjacent pre- The longitudinally projecting reinforcing bar (3) of section (1) processed poured after and is fixedly connected in section (2), after pour the upper and lower surface of section (2) and cover Steel plate (5), the built-in fitting (6) of the two ends of steel plate (5) respectively with two contiguous prefabricated section (1) is fixedly connected.

2. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that reinforcing bar (3) It is welding or sleeve connection to be poured after and the connected mode of joint (4) is fixedly connected in section (2).

3. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that steel plate (5) The mode that is fixedly connected with built-in fitting (6) is welding or bolt connection.

4. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that described pre- Embedded part (6) is deformed steel.

5. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 4, it is characterised in that described different Shaped steel is π shaped steel, U-steel or angle steel.

6. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that the steel Plate (5) is general steel plate or ribbed steel.

7. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that prefabricated section (1) pour section (2) concrete surface with after and make dentalation.

8. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that prefabricated section (1) section (2) concrete surface is poured with after and carries out dabbing processing.

9. a kind of prefabricated pipe gallery steel plate concrete attachment structure according to claim 1, it is characterised in that after pour section (2) filled using rear pouring concrete.